Monday, September 30, 2019

A country boy Essay

Not just my family members and I, every Cambodian citizen is the victim of genocide, the act which took the lives of around two million Cambodian citizens. One can say that this is the curse that all Cambodians were to experience while the others might say that it is our sin or karma. The war ended, and my family had to start from the scratch all over again. I did not really know how hard my grandparents had to go through to raise four children, but I experienced growing up living in a one-storey flat which was the shelter of at least ten family members. Unlike the other kids, I rarely saw my parents since my father had to work far away from home, and my mother was still pursuing her Bachelor Degree in Biology. I spent most of my childhood with my grandparents. My grandmother would always tie me behind her back to the hospital where she is still working as a retired doctor while my grandfather is a retired administrative staff of the same hospital, and was a former Lon Nol’s air force. I can still remember how I envied some of my childhood friends whom I called â€Å"Rich Kids†. During my very first day at school, my classmates were showing off their new bags, yet I only had a black plastic bag to store my books and pencils. The other kids were mocking that I did not even have a bag to carry my books to school. I was a quiet kid, and I chose to remain silent. I came back home, and told my grandmother that I wanted a bag. It took her around a week or two to buy me a yellow used bag which cost around 1000 Riels or less. Though it was a used bag, I hugged my bag with joy. I was a kid from the province, and I did not have a chance to go to expensive language schools like some other kids. Due to financial constraint, my parents had to send me to the language schools nearby. I never did well in English class. I was the worst student in my English class. Luckily, my parents were better-off, and they sent me to an international school. It is the place that changed my life. From a language student who never did well in class, I have now become a teacher of English. From a student who copied the whole reading text to submit to the teacher as a writing assignment, and got zero for plagiarizing, I have now won four national writing awards. Again, March and April this year have marked another turning point of the life of this country kid. I was slapping my face to see whether it was a dream or reality. I used to be rejected by the 26th ranking university in Asia, yet I got admitted and have been given a full scholarship to do a Master Degree at the second- best university in Asia which is one among the top universities in the world, and at the same time, I was also among the citizens of five Southeast Asian nations to be offered a full scholarship to pursue a Master Degree at one of the wealthiest universities in Europe. I failed once or twice, and it does not mean that I would always fail. I believe that life is full of possibilities. Life tests us to see how patient and how determined we are. Life does not kill us, but it teaches us. With hope and commitment, I believe that a person can make positive change to his or herself and to the society. â€Å"I like the night. Without the dark, we’d never see the stars.† ― Stephenie Meyer, Twilight

Sunday, September 29, 2019

Hershey’s Essay

Corporate Social Responsibility means supporting and strengthening the communities we are a part of. XXX Ltd is committed to maintaining the highest standards of corporate social responsibility in our business activities and dealings with our external and internal customers and the public on a whole. We are guided by the highest of ethical standards in our business decisions and relationships with others by carefully guard our reputation for â€Å"honesty, integrity and trust†. Our business is committed to providing quality products and services for our customers, clients, and business partners who we will treat fairly and with respect. We believe in fair play. Our word is our bond. We respect the rights and dignity of every employee and treat them fairly and without discrimination. We are tolerant of each other’s differences regardless of their ethnicity. We believe in team work, the sharing of knowledge throughout our organization, and recognize the contribution of every team member. We will offer our employees clear and fair terms of employment and provide resources to enable their continued development. We promote our philosophy by providing a healthy and safe working environment conducive to the well-being of our staff, and fostering an atmosphere of cooperation and harmony in the workplace. XXX Ltd is committed being a good corporate citizen, mindful of our responsibility to give back to the community in which we live and operate our businesses. Successive leaders of our Company have built on this tradition and we encourage our employees to serve their community and country through individual effort and through our XXX Ltd Community Development Foundation, and other organizations. Through the Foundation we make contributions in the areas of education, health, community outreach and the environment through our flagship program â€Å"LEARNING NEVER STOP†. This program offers scholarships for GSAT students across the island and is a key feature of the company’s website in the XXX Ltd â€Å"LEARNING NEVER STOP† tab, which shows all our updates. We recognize that we have a responsibility to the communities and countries in which we operate and will ensure that, in all our activities, by contributing to the safety and protection of the environment. Our Labour Day project 2013 was a massive â€Å"clean up and beautification project† program in Spanish Town, round about where the company adapt (park ). The company also donated two hundred and fifty thousand dollars (250,000. 00) to three primary schools for renovation. The XXX staff donned red to show support the Heart Foundation of Jamaica’s annual â€Å"Wear Red Day†. Representatives from The Heart Foundation of Jamaica along with our loving caring staff educate people through issuing of pamphlets. The foundation wishes to get more women to become aware of their risk for heart disease and promoting a heart healthy lifestyle.

Saturday, September 28, 2019

Effects of Temperature on Catalase

QUEENSLAND ACADEMY FOR HEALTH SCIENCES INTERNATIONAL BACCALAUREATE Term 1 2013 SUBJECT: BIOLOGY YEAR 11 HL & SL Name of Student: Name of Teacher: FORMATIVE ASSESSMENT ITEM: Chemistry of Life Practical Investigation Term 1 Task: Investigation of a Factor Affecting Enzyme ActionAspects Assessed: D DCP CE MS Introduction:Thousands of enzymes are found in living cells. In addition to making life possible, many enzymes have numerous applications that affect our daily lives in other ways such as food processing, clinical diagnoses, sewage treatment, and the textile industry.In this activity you will investigate how a particular factor influences the action of an enzyme. Conditions: Students are NOT required to design an experiment. Experimental design has been provided for you to use instead. You are however required to submit a Risk Assessment for the investigation. Students are to work independently. However, you will need to collect raw data from 4 other students to make the 6 trials. T he final version is to be submitted to TURNITIN and then class teacher. A journal will need to be included as part of the final submission.Time Allowed: 4 weeksDue Dates Task Out first lesson week1, term 1, 2013Risk Ass Due: last Lesson week 2, Term 1, 2013Final: First lesson week 6, Term 1, 2013Procedure: Your task is to investigate the effect of temperature on the activity of enzyme catalase found in beef liver. Use the experimental design and the BioLab Guide provided to assist with your report write up.Safety Considerations:You must have the risk assessment checked before continuing. NOTE: For this task you are required to submit a journal which documents your progress. You are also required to include photographs which display the techniques you used in the experimental procedures. This evidence will be used in assessing your manipulative skills in this experiment| RESULTS: REFER TO the Assessment Grading Matrix| Effect of temperature on the activity of Catalase Design Aspect 1: Research QuestionThis lab will be driven by the research question, Do changes in temperature (from 0? C, 7? C, 19? C, 37? C, and 100? C) have an effect on the activity of the enzyme catalase (found in beef liver) in the breakdown of hydrogen peroxide? Hypothesis If liver is placed in different temperatures of 0? C, 7? C, 19? C, 37? C, and 100? C and hydrogen peroxide is added to each piece of liver, then the liver placed in 37? C will have the largest reaction height. The liver in 100? C will have the smallest reaction height, followed by the liver in 0? C, then 7? C, and then 19?C. Introduction Pearson Baccalaureate: Standard Level Biology Developed Specifically for the IB Diploma defines enzymes as â€Å"protein molecules which act as catalysts for reactions. As catalysts, the real function of enzymes is to lower the activation energy of the reactions that they catalyze† (166). Enzymes are proteins; therefore the liver has a particularly high concentration of catalase. W hen hydrogen peroxide (H2O2) is added to liver, catalase catalyzes a reaction in which the hydrogen peroxide is broken down into oxygen gas (O2) and liquid water (H2O).Hydrogen peroxide is a toxic chemical that is produced as a byproduct of many normal cellular reactions, so it is crucial that catalase in the liver breaks the hydrogen peroxide down into the two harmless substances of oxygen gas and liquid water. The hydrogen peroxide must be quickly degraded or converted, and catalase accomplishes this task because one molecule of catalase can deal with six million molecules of hydrogen peroxide in one minute. Enzymes and the temperature of their environment are particularly important to the human ody because â€Å"Many of the reactions which represent the digestive process would need far higher temperatures than we are able to maintain safely if enzymes were not involved† (166). The prediction in the hypothesis is based on the concept of denaturation. As Pearson Baccalaureat e: Standard Level Biology Developed Specifically for the IB Diploma states, â€Å"Reactions which use enzymes do have an upper limit. That limit is based on the temperature at which the enzyme (as a protein) begins to lose its three-dimensional shape due to intramolecular bonds being stressed and broken.When an enzyme loses it shape, including the shape of the active site, it is said to be denatured† (75). Due to denaturation, the liver placed in 100? C will have the smallest reaction height because at this temperature catalase will begin to denature. Because â€Å"reactions with or without enzymes will increase their reaction rate as temperature (and thus molecular motion) increases†, the liver placed in 0? C, 7? C, and 19? C will have small reaction heights, but the heights will increase as temperature increases (75). The liver placed in 37?C will have the greatest reaction height because â€Å"human catalase works at an optimum temperature of 37? C, which is approx imately the temperature of the human body†. Although this lab is using beef liver instead of a human liver, the optimum temperature for beef liver should be similar to that of humans. The predictive graph on the previous page represents how as the temperature of beef liver originally increases, the height of the reaction increases as well due to an increase in molecular collisions. At a certain temperature, the catalase will reach its optimum temperature and have the greatest height of reaction.However, as the temperature continues to increase the enzyme will begin to lose its shape and denature, so the height of the reaction will decrease. This lab will be using beef liver, which contains the specific enzyme catalase, and by placing the liver into different temperatures it will be assessed how catalase performs under certain conditions. After the liver has been placed in different temperatures, hydrogen peroxide will be added to each piece of liver, and by measuring the heigh t of the chemical reaction it will be determined which temperatures catalase performs the best in.Reactions with a high height will represent catalase quickly and efficiently breaking down the hydrogen peroxide, and reactions with a low height will represent catalase slowly and inefficiently breaking down the hydrogen peroxide. This lab will serve as a model for the role of enzymes in the human body, and will outline the importance of enzymes for the human body. Independent Variables The independent variable is the temperature of the liver, and it will be measured in ? C. The different temperatures used will be 0? C, 7? C, 19? C, 37? C, and 100? C. Dependent VariablesThe dependent variable is the height of the reaction, and the bubbles of gas produced will be measured in millimetres (mm). Control Variables Table 1: Control variables and their treatments Variable | Effect | Control | Size of liver | Could increase or decrease the height of the reaction. A larger piece of liver means more catalase, which could break down the H2O2 at a more efficient rate than smaller pieces of liver. | Cut every piece of liver the same size by weighing each piece on an electric beam balance. Each piece of liver is approximately 1. 4g. pH | pH has an effect on enzymes and each enzyme has an optimal pH. By making the liver more acidic, basic, or neutral the height of the reaction could increase or decrease as it deviates from its optimal pH. | Do not change the pH of any of the solutions. This lab is only investigating the effect of temperature on enzyme activity, not the effect of pH on enzyme activity, so nothing should be added to the liver that would increase or decrease the pH. | Time | If some pieces of liver are kept in their specific temperatures longer than others, the height of the reaction could be greatly affected.By keeping the liver in its temperature for a shorter period of time, the liver itself has less time to change temperature which could greatly alter the resu lts. | Keep all of the pieces of liver in their specified temperatures for five minutes. | Size of test tube| Different sized test tubes will hold different volumes of O2 and will give incorrect measurements with the ruler| Keep all the test tubes the same size – with volume of 30cm3| Uncontrolled Variables The variables that will be difficult to control include air pressure in the lab and the volume of the liver.Measures will be taken to reduce the effect of these on the experiment by keeping air conditioning at 24? C and cutting the liver close to the same shape and size. Control Experiment The control experiment for this investigation will be the experimental setup at 0? C. All the steps in the method will be followed at this temperature. At 0? C the experiment should not proceed as the energy needed for enzyme action is unavailable. Design Aspect 2: Materials and Equipment Needed 10 Test Tubes 1 Package of Beef Liver 2 250mL Beakers 2 Test Tube Racks 1Forceps 1 Hot Plate 1LIce 1 Plastic Bin 20 mlHydrogen Peroxide 100 mL Beaker 1 10mL Graduated Cylinder 5 Thermometers 1 Sharpie 1 Electronic Beam Balance 1 Knife Method 1. Prepare an ice bath by placing ice into a container, and place a thermometer into the ice bath. Wait until the temperature has reached 0? C. 2. Prepare two more water baths like this at 7? C and 19? C. (You can replace these two temperatures with that of the fridge and room) 3. Prepare a hot water bath by placing a 250mL beaker filled with water on a hot plate, and place a thermometer into the water. Wait until the temperature has reached 100? C. You can use and electric water bath if one is available. . Prepare a warm water bath by placing a 250mL beaker filled with water on a hot plate, and place a thermometer into the water. Wait until the temperature has reached 37? C. You can use and electric water bath if one is available. 5. Obtain beef liver and cut the liver into 10 slices which are approximately the same size. Weigh each sl ice on an electronic beam balance to ensure they are the same weight. 6. Obtain 10 test tubes and place them into a test tube rack. Label 5 test tubes with a number from 1-5, and repeat for the remaining five test tubes. 7. Obtain 15mL of hydrogen peroxide and a graduated cylinder. . With forceps, place a piece of liver into each of the test tubes. 9. After the liver has been placed in the test tubes labelled 3, place a thermometer into the test tube rack and wait for 5 minutes. After 5 minutes, pour 2mL of hydrogen peroxide into each of the test tubes, observe the reaction, and label the height of the reaction after 1 minute with a Sharpie. (This is the experiment at room temperature. If you have prepared a water bath at 19? C then use it instead). 10. Remove both of the test tubes labelled 1 from the test tube rack, place them in the ice bath, and wait for 5 minutes.After 5 minutes, remove the test tubes from the ice bath, add 2mL of hydrogen peroxide into each of the test tubes, observe the reaction, and label the height of the reaction after 1 minute. 11. Remove both of the test tubes labelled 2 from the test tube rack, place them in a different test tube rack and place this rack into the fridge. Place a thermometer into the fridge as well. Wait for 5 minutes, and then read the temperature of the fridge and remove the test tubes. Pour 2mL of hydrogen peroxide into each of the test tubes, observe the reaction, and label the height of the reaction after 1 minute. If you have prepared a water bath at 7? C then use it instead). 12. Remove both of the test tubes labelled 4 from the test tube rack, place them in the warm water bath (37? C), and wait for 5 minutes. After 5 minutes, remove the test tubes from the warm water bath, add 2mL of hydrogen peroxide into each of the test tubes, observe the reaction, and label the height of the reaction after 1 minute. 13. Remove both of the test tubes labelled 5 from the test tube rack, place them in the hot water bath (1 00? C), and wait for 5 minutes. After 5 minutes, remove the test tubes from the hot water bath, add 2mL of ydrogen peroxide into each of the test tubes, observe the reaction, and label the height of the reaction after 1 minute. 14. With a ruler, measure from the bottom of the test tube to the mark which labels the maximum height of the reaction after 1 minute. Repeat this for all 10 test tubes, and record the measurements in your data table. 15. Pour the liver from each test tube into a waste beaker, clean each of the test tubes out, and put all materials away. 16. Combine the data that your own group obtained with the data from two other groups.This will allow for six trials worth of data, and once you obtain this sufficient amount of data, calculate the average height of the reaction for each of the five temperatures over the six trials, and then calculate the standard deviation for each of the five temperatures over the six trials as well. Variable | Unit of Precision | Error/Unc ertainty | Temperature | ? C | +/- 0. 5? C | Height | mm | +/- 0. 5mm | In the procedure, the maximum height of the reaction will be determined by marking the position of the tallest bubble that results from the reaction. Practical Safety and Risk AssessmentAll care will be taken when dealing with hot plate and hot water to prevent burning and scalding. The knife and glassware will be used carefully and hand gloves will be worn when handling hydrogen peroxide. Note the following hazards with hydrogen peroxide: Contact with eyes can cause serious long term damage. The solution is corrosive and can cause skin burns. For eye contact, immediately flush eyes with plenty of water. For skin contact, wash off with plenty of water. Liver | 15 ml of Hydrogen peroxide | Liver | 15 ml of Hydrogen peroxide | Setup Diagram Design Aspect 3 Sufficiency of DataThis lab will be investigating the effect of temperature on the activity of the enzyme catalase. In this lab, five different temperatures wil l be investigated (0? C, 7? C, 19? C, 37? C, 100? C). Each temperature will have six trials, and this will ensure the reliability of the data. With the sufficient data, the standard deviation and mean will be calculated for each temperature. The rate of reaction at the different temperatures will also be calculated. DCP Aspect 1: Results – Raw Data Table 2: (Insert Title) | Height of Reaction| Temperature | | | | | | | 0. 0 | | | | | | | 7. 0 | | | | | | | 19. 0 | | | | | | | 37. | | | | | | | 100. 0 | | | | | | | Insert data with all units and uncertainties. Ensure decimals of the raw data and the uncertainty is the same. Highlight your own data. Note: The highlighted data is the data obtained by me. The rest of the data has been collected from (insert names). Qualitative Observations: In a paragraph answer the following questions: What happens after adding hydrogen peroxide to each of the test tubes? Discuss size of bubbles, fizz, shape of liver, etc. Did you see any colour change? Include at least 2 photographs (clear, preferably in colour) with commentary as evidence of your observations.DCP Aspect 2: Processing Data Table 3: Statistical Processing – The following sample calculations will be done for the raw data Statistical Analysis| Formulae| Meaning of Symbols| Sample Calculation| Mean| | The mean or averagesum of sample measurements number of samples | = | Statistical Analysis| Formulae| Meaning of Symbols| Sample Calculation| Standard Deviation| | S = standard deviationx = each individual valueX = mean of all measurements= deviation from mean = degrees of freedom| Calculated in Microsoft Excel(show Excel screen clip)| Rate of Reaction| | | |Complete this table Table 4: (Insert Title) | Height of Reaction| | | Temperature | Trial 1 | Trial 2 | Trial 3 | Trial 4 | Trial 5 | Trial 6 | Average Height of Reaction | Standard Deviation (mm +/- 0. 5mm) | Rate of reaction(mm/min +/- 1. 0)| 0. 0 | | | | | | | | | | 7. 0 | | | | | | | | | | 19. 0 | | | | | | | | | | 37. 0 | | | | | | | | | | 100. 0 | | | | | | | | | | Insert data with all units and uncertainties. Ensure decimals of the raw data and the uncertainty is the same. DCP Aspect 3: Presentation of Processed DataGraph 1: (Insert title) Draw a graph of temperature vs. average height of reaction. Ensure to include the title, labels and scales of axes, units and uncertainties, vertical error bars and line of best fit (if applicable). Write up to 4 sentences commentary under the graph outlining the trend. State what the error bars represent. Graph 2: (Insert title) Draw a graph of temperature vs. rate of reaction. Ensure to include the title, labels and scales of axes, units and uncertainties, vertical error bars and line of best fit (if applicable).Write up to 4 sentences commentary under the graph outlining the trend. State what the error bars represent. CE Aspect 1: Conclusion The results obtained from this lab support/reject my hypothesis. My hypothesis was: (state hy pothesis here). By viewing the average height of the reaction, these results are supported/rejected. The liver placed in 37 °C had an average reaction height of (state) mm, (also state the average reaction heights of the other experimental setups). This data coincides/differs with the predictions stated in the hypothesis, where I stated â€Å"The liver in 100?C (complete). † By observing the constructed graph in Introduction, it is clear that the average height of the reaction initially increased as the temperature increased, but when temperatures increased past optimum (37 °C), (complete). Graph 1 constructed from the obtained data shows (discuss Graph 1). Graph 2 shows (discuss Graph 2). These results outline the effect of temperature on enzyme activity, and it is apparent that changes in temperature do/do not have an effect on the enzyme catalase. Conclusion ExplanationThe results obtained give increased insight into the role of enzymes in the human body. The beef live r closely modelled the human liver, and it is clear that catalase works best at an optimum temperature of (state). This is important because humans maintain a stable body temperature of (state), and with the aid of enzymes this temperature provides enough activation energy for metabolic reactions, in this case the breakdown of hydrogen peroxide into oxygen gas and liquid water. (Discuss why the liver placed in lower temperatures and 100 °C did not react well.Remember to cite the references used correctly). CE Aspect 2: Evaluation: Reliability While the results obtained from this lab clearly support/reject my hypothesis, the examination of the calculated standard deviation for each temperature (discuss STDEV). This range in standard deviation is due to errors that may have occurred throughout the lab. The liver placed in 0? C had a standard deviation of (sate), the liver placed in (discuss other STDEV’s). The larger the standard deviation, the less/more reliable the data. Al so discuss error bars and number of trials. Note: larger error bars = less reliable data; more trials = more reliable data). Errors/Limitations in Experimental procedure List as many errors you think may have occurred in the experimentation – from measurement as the reaction was slow, to timing, to others you can think of (preferably 5). Discuss how each of the errors could have affected your data. Significance Write a paragraph on how much the errors listed above could have impacted on your experiment’s reliability. CE Aspect 3: Suggestions for Improvements:For each of the errors mentioned above (about 5) suggest what can be done to improve this experiment in the future. Also state how these improvements will help. References Damon, Alan, Randy McGonegal, Patricia Tosto, and William Ward. Pearson Baccalaureate: Standard Level Biology for the IB Diploma (Pearson International Baccalaureate Diploma: International Editions). n/a: Imprint Unknown, 2008. Print. â€Å"Effe ct of Catalase on Hydrogen Peroxide. † http://www. sciencegeek. net/Biology/biopdfs/Lab_Catalase. pdf. (25 Jan. 2013). (Add your own references)

Friday, September 27, 2019

Diversity among individuals Assignment Example | Topics and Well Written Essays - 250 words

Diversity among individuals - Assignment Example Nurses, patients, and other stakeholders play a fundamental role in both health promotion and health education. In light of this observation, it is important for these parties to embrace diversity and subsequently understand how diversity-related practices influence education. The aforementioned teaching principles, learning styles, and teaching methodologies aid in the understanding of critical issues in the health sector. In the process, these aspects make it possible for scholars to identify areas of education that make the highest difference in the society as far as health and education are concerned. Most importantly, teaching principles, learning styles, and teaching methodologies make it possible for education to target specific issues and problems that subsequently promote positive outcomes in both health promotion and disease prevention (Bensley & Brookins-Fisher, 2009). In a bid to overcome differing views, health care providers address disease prevention and health promotion from the community or local level upwards. Given that health concerns differ from one community to another, the idea is to have health care providers customize their approach to disease prevention and health promotion towards the community, local population, or the society they

Thursday, September 26, 2019

Biography of Archimedes Essay Example | Topics and Well Written Essays - 1500 words

Biography of Archimedes - Essay Example Archimedes may be from an ancient civilization but his ideas were far from ancient. In fact, he might be credited as one of the first individuals that were able to think outside the box. Archimedes was born in the third century BC in Syracuse and we know very little about his life. What we do know is that his father’s name was Phidias and he was an astronomer, which might give us some insight into Archimedes’ character. His intelligence was probably sparked at an early age by looking into the heavens and considering all of the possibilities of the universe. What we do not know is if Archimedes ever had a wife or children. He was killed during the Second Punic War but not after, he made countless contributions to the world of mathematics and psychics. In fact, it is safe to assume that without his inventions and discoveries, the world – especially his immediate world – would have looked considerably different. His inventions shaped thought and shaped the war and his influence cannot be overlooked or diminished. Archimedes discovered the value of pi by drawing a large polygon outside a circle and placing smaller polygons inside the circle. As polygons increase, so do the sides of the polygons and as this number of sides increases, the number becomes an accurate estimate of a circle. When the number of sides of the polygons reached 96, Archimedes calculated their lengths and illustrated that the value of pi is approximately 3.1416. Archimedes also demonstrated how the area of circles is equal to pi if it is multiplied by the square of the circle’s radius. Archimedes is significant to not only to the world of mathematics, but also to the world in general as almost everything contains an element of math, whether we realize it or not. Through his thinking and discoveries, Archimedes makes understanding of the physical world and the phenomenon within it easier. One of his most popular inventions is the Archimean Screw,

Computer-Based information system Essay Example | Topics and Well Written Essays - 500 words

Computer-Based information system - Essay Example The paper will also discuss the computer-based information system of AT&T were misused by employees. The cloud-based data store is one of the recent information systems that was developed by AT&T Telecommunication Company. An article that was published by computer world indicated that the system is designed to help enterprise-based developers in the usage of (IoT) Internet of Things apps, as well as services. The system is designed to allow collection and the analysis of data more comfortable from various remote devices that are interconnected to large businesses (Hamblen, 2015). AT&T Company has also developed Monitoring systems for organizations. Currently, organization performance has been the primary focus for most organizations. Managers have been struggling on how they can improve the performance of their organizations by increasing performance by increasing supervision with a slight budget line. Monitoring systems have played a significant role in improving performance of various organizations (Computerworld, 1983). Computer based information system of AT&T has significantly reduced the cost of operations to most organizations. For instance, the development of cloud data stores played a significant role in cutting down the cost of hiring employees for a considerable number of organizations (AT&T Tech, 2012). Initially, most computer-based information systems of AT&T were predestined to improve the performance of the organization by either cutting down the cost of resources or improving the quality of services. Conversely, most information based system has been misused by employees for their personal gain. For instance, monitoring systems are designed to either monitor the performance of employees by the supervisors. A great part of monitoring systems is a computerized collection, analysis, storage as well as reporting

Wednesday, September 25, 2019

Reviewing Mixed Methods Essay Example | Topics and Well Written Essays - 1250 words

Reviewing Mixed Methods - Essay Example This statement is the hypothesis. A hypothesis is not always necessary for a study because â€Å"some areas of research are too new to warrant tests of hypotheses or the findings are so mixed that a specific hypothesis is not supported by the literature† (Cengage Learning, 2005b). However, they are a feature of the hypothetico-deductive scientific method. When testing a hypothesis, we do not necessarily predict the outcome of one variable based on a change in another, though this may also be the case. But herein lies the difference between a hypothesis and a prediction because testing a hypothesis can alternatively be concerned for example, with whether or not effects actually occur, whether some treatments have effects on an outcome measure, or groups differ from each other (Cengage Learning, 2005a). In short, a hypothesis concerns â€Å"a testable statement about the relationship between two or more variables† (Gross, 1996), which may or may not be a predictable cause and effect relationship. In factorial designs for example, a hypothesis â€Å"typically involves an interaction between your Ivs† (Cengage Learning, 2005b) i.e. the independent variables. Thus, a hypothesis allows a prediction to be made, but it is not itself a prediction, whereas a prediction is the expected result of an experiment based on a given hypo thesis (Hays, 1999). This distinction between a hypothesis and a prediction is often unclear (Singer, 2007) in students. The accuracy of a prediction related to a hypothesis could give a strong indication that the hypothesis is true (and so the null hypothesis is to be rejected). At the heart of research through hypothesis formation and testing is the drive for scientific exploration. However, when several hypotheses arise together we are dealing with broader theories. Whilst a hypothesis deals with specific sets of phenomena, a theory constructs a framework of plausible rational explanations for the whole phenomena. The general everyday

Tuesday, September 24, 2019

Alexandria Police Dept Intelligence Unit Proposal Essay

Alexandria Police Dept Intelligence Unit Proposal - Essay Example At the same time serial crimes and organized crime groups can be detected more quickly and more cases can be solved. Programs like community relations and robbery awareness could be carried out which helps to improve public trust and confidence, which in turn strengthen the information management system. By decentralizing the model and establishing a coordinating council, process of intelligence work could be made more effective and reliable.   Introduction Alexandria has maintaining highly skilled, energetic, technically oriented, well-equipped police department and serving the people better. It has the strength of 320 officers and 138 administrative workers.  Since 1986, the Alexandria police department has been internationally accredited by the commission on accreditation for law enforcement agencies (CALEA) which is a rigorous and difficult process, and has been reaccredited in subsequent years. By achieving this it has the professional status of law enforcement agencies worl dwide, and now has a responsibility of maintaining this status (Police Department, 2011). The department has provided searchable online crime data through the city's online crime search engine, and citizens can view it using an online Geographic Information System (GIS). Adding, the department's model mainly relies on the usage of advanced technology. Starts from 2004, the Alexandria police department is in the process of decentralizing its operations, and is now operating in three locations. One is at headquarter building at 2003 Mill road, and the other two is in 2034 and 2900 Eisenhower Avenue.  Decentralization of police function contributed to a decline in the effectiveness of communication among various investigative, operational, and administrative units. Information regarding new and emerging crime trends, patterns and neighborhood issues was often fragmented, which in turn fails to unite the department's resources and focus towards proactive and problem solving solutions. Joint efforts among all these units were also far more difficult to organize and manage (Police Department, 2011). More have to be done to improve communication and teamwork at all levels while increasing accountability and measure results on a regular basis. Increased communication among various operational and investigative units, teamwork, active participation, and accountability for results are to be the guiding principles of the department's process.  Ã‚   Crime trend in Alexandria Alexandria is the seventh largest and one of the highest income independent cities in Virginia. New town is largely populated by professionals those who are working with the federal civil service, or for one of the many private companies. On the other hand, the old town with its concentration of boutiques, restaurants, antique shops and theaters, is a major attraction for tourists. Alexandria has experienced a substantial decline in overall crime during the period 1970-2010, but has witnessed a si gnificant increase in scams and white collar crimes such as credit card fraud, worthless check cases, and larcenies of GPS units from vehicles, thefts of dodge caravans, IPods stolen, and phishing phone calls (Brian Block, 2007).

Monday, September 23, 2019

Research project on Maritime transportation Paper

Project on Maritime transportation - Research Paper Example Primarily, this research project analyses the background, research problems, research objectives, literature review as well as shortcomings in the maritime transport. In the late 1960’s, the air travel was most embraced way of travel to the oversea. However, there was a very slight change in the ships transport in the 1960’s.on contrary, efficient in the engine did improve the carrying capacity of the ships regarding the public lounges, deck space and the passenger staterooms as effect from 1950’s.here in, this ships did transport passengers pertaining their classes for instance, third, second and first class. Following this, passengers in first class were more luxurious as compared to those in the second and third class. Mostly, frequent transportation was from New York all the way to London. following this, the most known ships in the era of ocean liners were the Queen Mary, Carolina ,Ocean Monarch and the Laconia just to mention but a few. Notably, the actual change did come in during 1960’s with the sell of 747s and other aircrafts all over the world. Besides, the â€Å"United States Federal Aviation Administration† established a global network of airport transportation. Following this, boat travel was not practical and economical since the rate of the jumbo had come into existence. Progressively, since passengers opted to travel with air, it was clear that the maritime transport could end. Apparently, the Love Boat decided to opt to the idea of luxury exploration, apart from the usual transport ability. Therefore, in order to revive this nature of maritime transport, the Love Boat made it more luxurious in order to capture the interest of those who wanted to travel in luxury or was going to vacation, and this was in influence by the year 1970s. Following this, there was a growth in the cruise ship vocational travel in all social classes. Casinos, Ocean Viewers, Pools and onboard entertainment were all available on the cruise ships.

Sunday, September 22, 2019

The Kite Runner Essay on Literary Value Essay Example for Free

The Kite Runner Essay on Literary Value Essay Khaled Hosseini’s The Kite Runner relies too heavily on coincidence; consequently, surrealism masks the novel. Though the novel portrays the cruelty of the Taliban and poverty in Afghanistan, Hosseini’s reliance on coincidence lessens its literary value as the novel descends into ridiculous and unrealistic plot twists. As critic Edward Hower notes, such plot twists are â€Å"better suited to a folk tale than a modern novel.† Hosseini thickly foreshadows the plot line and in doing so, uses coincidence as a form of simplicity. He thus not only insults the intelligence of the reader, but also lessens the novels literary value by using contrived plot twists. When Amir randomly starts talking to a homeless man in the street of a devastated Kabul, for example, he learns that the homeless man was a former university professor who, coincidentally, taught with Amir’s long deceased mother. Amir learns more about his mother’s characteristics from the homeless man – that she was â€Å"profusely happy† – than he did from Baba, his father. This coincidence consoles Amir during his archetypal night journey through Kabul, and further lessens the novels literary value because it uses a ridiculous incident in an attempt to relieve the reader’s anticipation of absolute chaos and turmoil. Instead, the plot transforms into a surrealistic story in which the reader still anticipates a typical â€Å"night journey.† Hosseini even attempt to excuse his writing flaw through Amir, who explains that while the incident may seem coincidental, such random meetings occur often in Afghanistan. When Amir learns his former childhood nemesis, Assef – now the emblem of Hitler, who ironically was Assef’s childhood role model – keeps Sohrab hostage, the plot line spirals into â€Å"a folk tale.† Reality seems even more surreal. Just as Assef threatens and molests Hassan, he now ironically threats and molests Hassan’s child. When Assef and Amir fight, Sohrab defends Amir by skillfully using his slingshot to injure Assef’s eye; similarly, Hassan uses a slingshot to threaten Assef and protect Amir from Assef. After Amir’s surgery due to injuries from the fight, a scar appears above his lip; this parallels Hassan’s scar after a surgery that fixed his hare-lip. Ultimately, these ironies and coincidences demonstrate little literary mastery. Amir finally redeems himself from betraying Hassan when he selflessly flies a kite for Sohrab. He does so in an attempt to give Sohrab the â€Å"will to live again.† Before he runs a kite for Sohrab he echoes Hassan’s words by saying â€Å"for you, a thousand times over.† This scene ultimately draws too many parallels; the novel ends on a surrealistically happy note which devalues the overall Afghani â€Å"tragedy.† The tragedy ends on a ridiculous note by suggesting Amir redeems himself by acting like, and having the characteristics of, Hassan. The plot twists throughout the novel present more literary flaws than literary value.

Saturday, September 21, 2019

Difference Between Love And Sex Theology Religion Essay

Difference Between Love And Sex Theology Religion Essay Peter Bertocci has explained the human experience of sex and explains the value of sex as part of the meaning of life. Regarding sex an end in itself Peter argues that more profound satisfaction is felt when the normal experience of sex lust is not primarily an end in itself but a symbolic expression of other values. Bertocci further explains the challenge in love which he explains through his progression of love in which marriage and its values are highlighted as an essentiality to protect sex and love. He argues that sex, love, marriage, family, and social responsibility are the key factors that bring stability in the society and nourish the values morality. He considers love as a an essential element to live, otherwise it will be a mere existence not living joyously. He argues for the place of marriage in society and emphasizes on the self regeneration of the partners through this novel relationship. In my opinion he really draws on personal experience and has a closed minded view. I disagree and will give reasons and arguments in my essay as to why I think that Bertocci narrates a story of an ideal situation. Difference between Love and Sex: Psychoanalysis asserts that love and sex can never be of same origin and character due to differences of decisive nature. Love and sex must be analyzed in their own purview and in their purest forms. Sex is related to biology related to some organism; love gives an emotional touch and a sign of individuals thoughts. Sex is used to eliminate the tense attitude; love can be used as an escape goat from ones own failure. Sex satisfies a person physically; love gives happiness. Sex has a broader meaning; special meaning is shown through love. Natures call can be answered through sex; culture is satisfied through love. Sex is known to millions; millions have not even heard of romance or love. Sex is arbitrary; love is always directed to someone. Sex gives relaxation; love grooms the personality. The taste and pleasure of sex cannot be called later while love can be recalled anytime even in thoughts if the lover is not physically present. Sex is an act; love is spiritual. Sex eagerness is f or a short time whereas love is continuous warmth. (Reik, New York: Grove Press.  1945)[1]. Can Love and Lust be combined? (Reik, p. 19), observes that if love and sex are combined, it is very difficult to assess that which has the most part or share, to be precise, during a sexual intercourse. I believe that it is purely dependant on our perception. It is our own mind and body that drives us to a particular point where we need to think that what should be combined and what should be separated. I believe that there are ways in which sex without love can be as joyous, fruitful and soothing as sex with love. So, the question as to the combination of lust and love, one cannot say that which is more dominating but one can say is that crude form of sex is generated after divorcing love from sex. Sex with Love: What Bertocci has explained about love is that through sex with love one gives in everything but Rollo May s  Love and Will  (New York: Dell Publishing Co.. 1969), says that one will always hold something back until the act is personal, and if we use this word personal instead of love, the context of sex is broadened and sex can be joyful even the partners are not lovers. May further argues that holding off something does not mean that sex will not be a pure sex. According to May (p. 311), relationship and intimacy are much more important factors than merely having sex with a person because of the impersonal society and it is unknown that the act of sex will satisfy the required needs of relationship and intimacy. But what one can say according to Mays stance that through love one is absorbed in another and isolation can be overcome through this. The irony of love is that one is at the same time losing oneself and absorbing the other in him. Mays writings show a lack of understan ding of how gratification can be achieved through sex without love. Analysis of Sex with Love: Like May many people in this world are unaware of the possibility of sex being a loving act even without being lovers to each other. As I mentioned earlier this is a traditional or closed mind view that sex without love is not as fruitful as sex with love. I reiterate my view that Sex without love allows the partners to have a more relaxing feeling. Contrasting to what bertocci, I would say that sex with love leading to a more chaining relationship which leads to taking each others pain, then placing your life in the basket of marriage which will land your life in the rearing of children. Bertocci further asks you to nourish the society through all these preceding acts of yours. Sadly, a true and a happy relationship of sex have been destroyed by the clogging views of writers such as May and Bertocci. Sex should be as free and motivating as a clear sky is available to the bird that goes high in strength and spirits to have a broader overview of the intricacies of this world. This fee ling takes me higher and regenerates the true spirit of life and makes me see what the believers of sex with love cannot see or visualize in their thoughts. Sex without Love: (Russell Vannoy, Buffalo: Prometheus, 1980) gives some of the examples from the papers of his students. I would like to mention a few; pleasuring my lover leaves me pleasure less as the mind is devoted to his satisfaction, thus disturbing the whole concept of sex. The deeper you get involve in other person and as the other is absorbed in you, the more a person is ceased to be a separate person, which is absolutely not encouraging and equally not satisfactory. The lovers gets cocksure and sometimes the girl does not feel horny, then if the lover pushes her and she refuses, is she getting selfish. I would say no because this might not have been the case with a stranger whom she did not love, a stranger cannot push you for something and one is at liberty to say no to stranger without worrying to dishearten him. Once a lover knows what you are capable of in the bed, he wants repetition whereas a new person will be attracted to the same demonstration. Self-sacrifice is common among lovers whereas no such sacrifice is required to be done during sex without non-lovers. (Casler, New York: Behavioural Publications, 1973), has argued that love is needed to satisfy the needs of personal insecurity. These needs are dictated to by the societal pressure and those without it are not considered an active part of this so called moral society. Caslers view shows that people getting loved or love someone are just trying to gain self-worth. With this attitude in mind the sex is most unfulfilling. Considering the older ages when women were not respected, how can males give respect to them in the shape of love? This has aroused women to write the most criticism on love. (Robert Solomon, Buffalo,  NY: Prometheus Books, 1976), writes that sexual encounters with strangers are the most satisfying ass there is fear, guilt and anticipation. Conversely sex with those we know and love is much less satisfying as the habits and reactions are known to each other which, nullifies the uniqueness among the partners. Moralists paints the picture of sex with a non-lover as crude and animalistic. They still have their view of having successful sex with only the ones you love and the other sex is never pure. Giving justification to love is just as hypocrite as actually doing hypocrisy during crude sex in love; one says that if I dont love her I am exploiting her, so he loves to make his sex justified is just another form of hypocrisy. The advocates of sex with love has not allowed the people to think to stop being selfishly loving others to justify the societys value system. Once this selfish behavior is outsmarted, only then a true loving act of sex could emerge without romantically being involved in the other partner. Many husbands perform crude sex and wives are left unfulfilled. The reason is that wives want a sensuous sex while men want manly, lusty sex which cannot be achieved as they get involved in each other and cannot push for the demands and now when married cannot change husbands. This situation leaves both thirsty for real experience in sex. Social Approval: Societys approval is considered necessary and the sex must be given the assent of the pure spirit of love. Otherwise the sex would animalistic and dirty. If this option is considered then, even in sex with love the partners remain unfulfilled and they are not spontaneous and guilt free. I believe that societys concept must not be involved in sex relationships, as it is only to strengthen the institution of marriage. Marriage will certainly make the experience of sex laborious although the society gives the assent of piety but will ultimately make the people who make the society unfulfilled with regards to their sexual satisfaction. Analysis of Sex without Love: I strongly believe that sex without love is much more fruitful and joyous than the sex with love. The reality is still that sex opens the doors for the people to happiness and gratification but when love comes and knocks the door and hugs sex, it suddenly engulfs sex and convinces to move to the next stage of sex with love. I reject this and say that this encompassing is just like going into a war which one choose for its own self without any reason. Conclusion The sex without love is the superior, mature and natural attitude which one must follow. The societys regeneration is indeed laid in the foundations of liberty and freedom of choice which can only be exercised when one has no restriction to follow a particular schedule or guidelines while having sex. I strongly believe in having sex without love for which I have argued in my paper after taking a view of the various aspects of what people want and what people face after taking a wrong decision of landing at a lovers corner.

Friday, September 20, 2019

Analysing The Effects Of Ddt Environmental Sciences Essay

Analysing The Effects Of Ddt Environmental Sciences Essay DDT is a white, solid, crystalline powder with no taste or odor. DDT (C14H9C15) is derived from reaction between chloral and chlorobenzene in presence of fumes of sulfuric acid. DDT is insoluble in water and it is soluble in organic solvents such as, fats and oils. DDT (dichlorodiphenyltrichloroethane) is an organochlorine pesticide widely used to control mosquito and insects that carry diseases like malaria, typhus, and other harmful diseases and pest in agriculture (Martin, 2008; Raghavendra et al., 2010). DDT was banned in the U.S. in 1972 because it was identified to cause damage in birds and other wildlife, but it is still used in some developing countries (Bhuiyan et al., 2008). It is still present in environment due to current use in other countries. DDT and its breakdown products (DDE and DDD) can easily break down by sunlight, but they are very hard to dissolve in soil. DDE (dichlorodiphenyldichloroethylene) and DDD (dichlorodiphenyldichloroethane) are two major metabolites and breakdown products of DDT. DDD was also known as pesticide, but it was banned whereas DDE does not have any commercial use (Eskenazi et al., 2009). DDT was first synthesized in 1874 by Othmar Zeidler. In 1940, DDT was first used to treat Dutch elm disease. DDT was majorly used in World War II to protect troop and civilians from diseases. In 1939, Paul Mueller discovered DDT as insecticide and he won the Nobel Prize in 1948 for it. After this, people started using DDT as pesticide for their home, agriculture purpose and in gardens (Eskenazi et al., 2008). However, DDT started to cause diseases during this time and this increases public concern to Rachel Carsonà ¢Ã¢â€š ¬Ã¢â€ž ¢s Silent Spring. Rachel Carsonà ¢Ã¢â€š ¬Ã¢â€ž ¢s Silent Spring was published in 1962, which contains environmental impacts of DDT in the US (ATSDR, 2002; Eskenazi et al., 2008; Martin, 2008). DDT is strongly absorbed by soil and remains there for long period of time (Bhuiyan et al., 2008). They released from soil by various types of reactions such as, runoff, photolysis, aerobic and anaerobic biodegradation and volatilization (van den Berg, 2009). In surface water, DDT will bind to particles that are present in the water and sediments. DDT is taken up by small organisms and fish from the water and then bioaccumulate in organisms to higher trophic levels. DDT deposited into the adipose tissues and fats in organisms. DDT shows bioaccumulation and biomagnification as it has lypophilic property (Bhuiyan et al., 2008). In 1950s, first evidence of DDT toxicity in bald eagles, robins, osprey, pelicans, peregrine falcon, and fish-eating mammals was observed (Xiao et al., 2008; DDT: An Introduction, 1996; Martin, 2008). Objectives This paper has five objectives: (1) To discuss the sources and main causes of DDT; (2) To discuss its mechanism of action as insecticide or pesticide; (3) To discuss the health problems and toxicological effects associated with DDT; (4) To discuss the environmental impacts of DDT; (5) To discuss control measures and various methods of dealing with DDT sources and problems. DDT in the Environment DDT is not soluble in water but it can form strong bonding with soil particles. DDT is still present in environment in soils that were exposed to DDT during earlier time. DDT is a volatile so it can be transported and evaporated as a gas. DDT is not commonly found in groundwater because it is less soluble in water and it will more likely to bound with soil particles rather than water molecule (ATSDR, 2002; Walker, M., Powell, P., 2003; van den Berg, 2009). DDT can be present in air in the form of gas or it form small aggregation with dust particles. The chemical evaporate in warm temperature and it can travel long distance as a gas from the site of application. Such as, the study was conducted in Medford, Oregon where, it has climate cooler and soil is full of organic matters. It showed only 17 to 18% evaporation of DDT from the soil during five years of time period. The similar study was conducted at Arizona showed that DDT showed its presence in the air after six months of application. It showed up to 50% of DDT evaporated out from the soil within 5 month of period of time (van den Berg, 2009; Walker, M., Powell, P., 2003). In the form of vapor, DDT has 2 days of half-life time period (ATSDR, 2002). In tropical soil, DDT has half life within the range of 3 to 7 months while it is up to 15 years in temperate soil. DDT has half life time in human is of greater than 4 years (van den Berg, 2009). DDT and DDE are low soluble in water so they generally concentrated in the top region of soil. In soil, many bacteria degrade DDT and then they converted it into DDE, which is less toxic but more persistent in the environment (Walker, M., Powell, P., 2003). Mechanism of Action of DDT as Pesticide DDT generally affects nervous system of insects. It affects in neuron and opens sodium channels, which make them to cause fire rapidly. This condition leads to spasms and then death (van den Berg, 2009). Sources of DDT DDT is a synthetic organochlorine pesticide. Many pesticide companies have been involved with DDT production. By 1991, only Hindustan Insecticides, India; Enichem Synthesis, Italy; and P.T Montrose Pesticido Nusantara, Indonesia were listed as basic producers by UN Environment Program (UNEP). It was also produced in Mexico. There is no production record found for DDT worldwide (van den Berg, 2009; DDT Factsheet, 1998). DDT is entering into environment through various natural and anthropogenic sources. There are some anthropogenic sources that are caused by human. Many studies conducted on anthropogenic sources because they can be easily controlled and eliminated to reduce the DDT concentrations from the environment. There are many reasons behind the presence of DDT residue in environment, such as manufacturing and application of DDT to control tropical diseases like malaria, transport of DDT by air, DDT production continues by using other names like Dicofol, and dumping of waste where the DDT is totally absent. These are some sources of DDT which are anthropogenic (Dymkowska-Malesa, 2009). Natural Sources Run-off The major source of DDT entering in water bodies is agriculture run-off from fields that were earlier sprayed with DDT to control insects or pests from that area. Soils accumulate DDT from direct application of DDT in to that particular soil as pest control. Runoff from heavy rains can wash deposited DDT with soil particles and sediments directly into nearby water body, which allows DDT to enter the aquatic food chain. DDT is lypophilic compound so it can easily get deposited into body fat or adipose tissues of aquatic animals and then DDT shows bioaccumulation and further biomagnification (van den Berg, 2009). Anthropogenic Sources Many lakes and streams were directly sprayed by DDT using aerial spraying of crops. DDT cannot contaminate ground water as it strongly binds with soil particles. Industrial waste and effluent from pesticide industries may also contaminate aquatic environment by DDT. Leaking landfill sites, historical uses, long distance transportation through atmosphere as a gas and illegal use of old stock are examples of sources of DDT that contaminate aquatic environment as well as atmosphere by adding DDT (Dymkowska-Malesa, 2009). DDT can deposit in plant tissues as well as in the fatty tissues of animals, birds and fish. DDT can enter into the body by three common routes such as, inhalation, ingestion and dermal exposure. Most common route of exposure to DDT is ingestion of contaminated food. It can enter into the body by inhalation and by skin but it is rare (Dymkowska- Malesa et al., 2009; Schecter et al., 2010; Sereda et al., 2009). Health Problems and Toxicological Effects Associated with DDT Humans are exposed to DDT from contaminated foods, such as leafy and root vegetables, fish, poultry, fatty meat, etc. Some countries still use DDT as pesticide, so eating foods which are imported from other countries that allow the use of DDT exposed people to DDT. Drinking contaminated water or breathing contaminated air or soil particles near waste sites, industrial areas or landfills also increase the chances of getting exposed with DDT (ATSDR, 2002; Dymkowska-Malesa, 2009; Schecter et al., 2010; Sereda et al., 2009). DDT is an environmental health issue largely because of its lypophilic property which makes it enable to store in fatty tissues of organisms and another property is biomagnification (Tomza-Marciniak, A., Witczak, A., 2009). DDT, DDE and DDD can be measured in blood, tissue, fat, urine, breast milk (Turusov et al., 2002) and semen. These are some body fluids, that shows the presence of DDT and it can only predict the chances of health effects in the person. When DDT enters into human body, it deposited into fatty tissues, adipose tissues (Ociepa-Zawal et al., 2010), and organs such as testes, thyroid, adrenal, etc. It shows deposition in liver and kidney like major organs, too (Sereda et al., 2009; van den Berg, 2009). There are two types of toxicological effects associated with DDT: (1) Acute toxicity: DDT is slightly toxic to mammals through oral route of absorption. LD50 values of DDT exposure through oral route are different in different animals such as, in rats it is range from 113 to 800 mg/kg; 400mg/kg in rabbit; 300 mg/kg in guinea pig; 500 to 750 mg/kg in dogs and more than 1,000 mg/kg in goats and sheep. When DDT enters through oral route, it increases absorption into the areas of high fats in gastrointestinal tract. DDT is generally not toxic via dermal route of exposure. Acute effects of DDT on human shows symptoms like nausea, diarrhea, irritation of eyes, nose, and throat, increase liver enzyme activity, excitability, malaise, etc. and upon higher doses, it shows symptoms like tremors and convulsions (EXTOXNET PIP, 1996). (2) Chronic toxicity: DDT cause chronic effects on the major organ systems of the body. It affects nervous system, liver, kidney, and immune system. Immunological ef fects by DDT shows reduce antibody formation (EXTOXNET PIP, 1996; ATSDR, 1994; Eskenazi et al., 2009; Sonkong et al., 2008). DDT causes reproductive effects in laboratory animals. Oral dose of 7.5 mg/kg/day for 36 days in rats resulted in sterility. In rabbits during periods of gestation, doses of 1 mg/kg/day resulted in decreased fetal weights on 4-7 days and 10 mg/kg/day resulted in resorptions on 7-9 days. Dose of 1.67 mg/kg/day in mice resulted in decreases embryo implantation (ATSDR, 1994; Eskenazi et al., 2009). DDT is also known as endocrine disruptors. DDT is a synthetic organochlorine pesticide that when entered into the body either blocks or mimics hormone systems and disrupts the normal body functions. Many studies indicate that DDT has estrogenic effects in mice, in which DDT increased the weight of uterus in mice that is called as uterotropic effect and development of pseudo estrus in rats also caused by DDT. DDT causes permanent, male-to-female sex reversal upon a single exposure of eggs to  o,p ´-DDT in medaka fish. In rats, DDT can facilitate implantation, maintained pregnancy and it can exert an uterotropic effect, too (Turusov et al., 2002; Eskenazi et al., 2009). DDT and DDE can easily cross the placental barrier to transfer from mother to fetus; therefore it can cause harmful effects to fetus (Sapbamrer et al., 2008). DDT can causes teratogenic effects in fetus or it can cause premature birth in pregnant women. Maternal dose of 26 mg/kg/day in mice during the period of gestation to lactation resulted in impaired learning performance in maze tests (ATSDR, 1994; Eskenazi et al., 2009; Lea et al., 2008; Sapbamrer et al., 2008). Health effects of DDT also include pregnancy loss during first few months, leukemia, diabetes, loss of fertility, cancer like pancreatic, liver, breast (Cohn et al., 2007; Ociepa-Zawal et al., 2010), testicular (Cohn et al., 2010), and other cancers (Turusov et al., 2002; Eskenazi et al., 2009), and neurodevelopmental deficiencies (van den Berg, 2009; Beard, 2006; Cox et al., 2007). Many studies show mutagenic effects of DDT by using in vitro and in vivo genotoxicity assays which shows chromosomal aberrations. People who directly or indirectly exposed to DDT showed higher number of chromosomal damage in their DNA. This shows that DDT causes genotoxic effects in humans. It also shows organ toxicity in major organs of human body, such as liver, kidney, nervous system (ATSDR, 1994; Eskenazi et al., 2009; EXTOXNET PIP, 1996). The immune system has shown signs and symptoms of sensitivity to DDT. There is no known data on effects of DDT on function of immune system of humans. However, some animal studies have indicated that DDT effects immune cell ratio, development of immune response, cellular response and also antibody production (Eskenazi et al., 2009). Environmental Problems Associated with DDT DDT can also cause problems for wildlife, especially birds, fish, etc. DDT enters into the aquatic environment via natural and anthropogenic sources; it takes up by some small fish or other aquatic animals. DDT is lypophilic compound so it deposited in the fatty tissues of fish or other organisms. DDT may bioaccumulate significantly in fish and other aquatic species, and it also shows biomagnification. A rainbow trout shows 160 days of half-time for elimination of DDT. Bioaccumulation occurs with very little amount of DDT concentration in fish and other aquatic species. Predatory birds or large fish feeds on them and resulted in exposure to DDT (Xiao, 2008; Tomza-Marciniak, A., Witczak, A., 2009). Many studies showed that DDT and DDE can act as carcinogenic, neurotoxic, immunotoxic and reproductive effects on animals (Turusov et al., 2002). In birds, exposure to DDT mainly occurs through food chain and sometime the direct exposure to eggs or birds also observed. In 1950s, first evidence of DDT toxicity was observed in bald eagles, robins, osprey, pelicans, peregrine falcons and other fish eating mammals. In birds, DDT and DDE reduce Ca-dependent ATPase activity in the shell gland of birds resulting in shell thinning and increased egg damage during incubation period (Turusov et al., 2002). Control Measures It is easy to control anthropogenic sources of DDT than natural sources. DDT can be removed by many chemical and biological processes. Once it gets into the food chain, recovery becomes difficult as it shows bioaccumulation and biomagnification. Many organochlorine compounds or pesticides are degraded by microorganisms. Microbes possess enzyme system to degrade organochlorine pesticides, such as dehydrochlorination, isomerization, oxidation, etc. Microbial degradation of DDT is observed by two ways; aerobic and anaerobic degradation. Many studies reported that bacteria like Serratia marcescens, Alcaligenes eutrophus A5, Lactobacillus plantarum, Micrococcus varians, and Pseudomonas sp. can degrade DDT by the process of aerobic degradation. One study reported that Fungus named white rot fungi can do mineralization of DDT (Sonkong et al., 2008). Degradation and transformation of DDT using microorganisms will provide most proficient way to deal with the problem, which is bioremediation. Boussahel et al., 2009 studied adsorption and kinetic process to remove DDT from aqueous solutions using low-cost adsorbents. During the study they used batch adsorption technique to determine adsorption efficiency using two types of adsorbents, wood sawdust and cork wastes. The result of the study was compared with a commercial powdered activated carbon. Langmuir isotherm was used to calculate the adsorption capacity. The study showed that wood sawdust is the most effective type of adsorbent for the removal of DDT from aqueous solutions. It can be used in decontamination of water and also in treatments of waste water in agriculture purpose and industries. Conclusion DDT is a toxic compound that exhibits bioaccumulation and biomagnification through food chains. After World War II, DDT started causing problems in human health and in 1950s, DDT cause detrimental effect on birds. These are some events that showed the dangers of DDT for human as well as for environment. Many studies over the years have produced considerable amounts of evidence to prove the toxic effects of DDT. DDT was banned in U.S. very long ago but some other countries still using DDT as pesticide to prevent malaria. Methods and solutions were found, that replaces DDT to control malaria. Many chemical and remediation processes was found that totally remove DDT from solid and aqueous solutions but still have much room for improvement. Due to biomagnification, the effect of small amounts of DDT will be felt many years into future. It has been so long that U.S. banned on DDT but still the outbreak of birds problems and human health problems going on. Future Research Needs Several methods found for detection of DDT including enzyme immunoassay have been developed (Hirano et al., 2008). One of the major problems with DDT is biomagnification. There are so many methods like volatilization, bioremediations, and adsorptions procedures currently being studied (Sonkong et al., 2008; Boussahel et al., 2009). DDT in soils and sediments form strong bond so it is very hard to remove DDT from soil and it cannot degrade easily in soil. Methods found for the removal of DDT from aqueous solutions (Boussahel et al., 2009). Presence of DDT in organisms like birds, fish, etc is the area of concern in future that needs to be reduced. Much future research is needed to introduce new chemical compound that can deal with malaria like diseases and is comparatively less toxic to human and environment.

Thursday, September 19, 2019

growaw Kate Chopins The Awakening - Edna Pontellier’s Awakening :: Chopin Awakening Essays

Edna's Awakening in Kate Chopin's The Awakening      Ã‚  Ã‚   The society of Grand Isle places many expectations on its women to belong to men and be subordinate to their children. Edna Pontellier's society, therefore, abounds with "mother-women," who "idolized their children, worshipped their husbands, and esteemed it to a holy privilege to efface themselves as individuals".   The characters of Adele Ratignolle and Mademoiselle Reisz represent what society views as the suitable and unsuitable woman figures. Mademoiselle Ratignolle as the ideal Grand Isle woman, a home-loving mother and a good wife, and Mademoiselle Reisz as the old, unmarried, childless, musician who devoted her life to music, rather than a man.   Edna oscillates between the two identities until she awakens to the fact that she needs to be an individual, but encounters the resistance of society's standards to her desire.      Ã‚  Ã‚   Kate Chopin carefully, though subtly, establishes that Edna does not neglect her children, but only her mother-woman image.   Chopin portrays this idea by telling the reader "...Mrs. Pontellier was not a mother-woman.   The mother-woman seemed to prevail that summer at Grand Isle".   Edna tries on one occasion to explain to Adele how she feels about her children and how she feels about herself, which greatly differs from the mother-woman image.   She says:   "I would give up the unessential; I would give my money; I would give my life for my children; but I wouldn't give myself.   I can't make it more clear; it's only something I am beginning to comprehend, which is revealing itself to me."   This specifically contrasts the mother-woman idea of self-sacrificing for your husband and children.   Also, the "something . . . which is revealing itself" does not become completely clear to Edna herself until just before the end, when she does indeed give her life, but not her self for her children's sake. Although Edna loves her children she does not confuse her own life with theirs.      Ã‚  Ã‚   Similarly to Edna's relationship with her children is that with her husband, Leonce.   The Grand Isle society defines the role of   wife as full devotion towards their husband and to self-sacrafice for your husband. Edna never adhered to the societies definition, even at the beginning of the novel.   For example, the other ladies at Grand Isle "all declared that Mr.

Wednesday, September 18, 2019

Illusion in Death Of A Salesman :: essays research papers

What does Williams say about illusions and how are they important/dangerous to us? Tennessee Williams’ protagonist, Blanche Dubois, is a woman struggling to escape the faults of her past and secure a new life for herself. Her many mistakes have turned her life upside down and created a host of problems for her to deal with. To help her deal with the extreme direness of her existence, Blanche often creates fantasies and delusions to make her life seem more stable than it actually is. Although Blanche’s ultimate mental deterioration is partially due to her adherence to her delusions, it seems it is also these fantasies that help Blanche cope with her desperate situations. It is in this way that Williams presents illusions as something that can be important in our lives. Sometimes experiences in life are too traumatic or emotionally consuming to deal with outright. By tricking ourselves into thinking that the situation is better or different, we find ourselves more ready to live with whatever problem that effects us. However, as is the case with Blanche, illusions can potentially be destructive to our psyches as well. Hiding behind delusions to avoid our problems can make them all the more cataclysmal when we are forced to return to reality and face them. Throughout A Streetcar Named Desire, Blanche subdues the demons of her past by deceiving herself and those around her into thinking that they don’t exist. This method of coping with her problems makes them even more disastrous when she is finally forced to face them. As an added blow to Blanche’s mental stability, her spirit is destroyed by her savage rape at the hands of her brother-in-law,