Environmental problems Essay

Everyone has heard about global problems. Television and the press often writes about storms, droughts, melting of glaciers, or hunger in Africa. But not too many of us know the details, and the stories behind those problems. These days the biggest environmental problems are: Global warming, Pollution, drought, overpopulation, deforestation, Endangered species. Let’s start from global warming. Global warming is the process by which the Earth’s average atmospheric temperature increases over time.In general Global warming means the difference in the Earth’s global climate over time. This process is timeless and still accelerating. Other big environmental problem is pollution. Pollution can be very diverse. There are several types of pollution, how air pollution, water pollution, soil pollution and noise pollution. I think everyone knows what’s mean air, water and soil pollution, but do you know what means noise pollution? Noise pollution refers to undesirabl e levels of noises caused by human activity that disrupt the standard of living in the affected area. We need talk more about pollution, because everyone can contribute to the solving of this problem. Next environmental problem is drought. Lithuanians think, that drought is never going to be our problem, but is it true? Drought is defined as a long period of time when there is no rain. Drought can be further prejudiced by human activity. Drought often have a significant impact on agriculture. There are other drought consequences. Everyone heard about very large number of people in China, India. This issue is not relevant to us, but in rest of the world this is a very big problem. Situation, when there are too many people living in a certain area, is called overpopulation. This problem is very important to South Asia and Africa. Some countries, such as China, tries to reduce the birth rate, but other don’t have money to try to stop this problem. Other big environmental problem is deforestation. Deforestation is, when forests are lost and not replanted. Sometimes deforestation happens when people change the land into farms and cities. A lot of deforestation is from removal of all the trees from a forest for wood or fuel. Without the forests, the natural habitats of the animals are lost and lots of animals are dying. There are some facts about deforestation. And the last environmental problem is Endangered species. All problems, IÂ  have told you before, have influence for animals and plants. Pollution, global warming, droughts are dangerous for the environment. And some animals and plants are dissapearing. Some animals, we are never going to see again. Other endangered animals are included in the Red Data Book. There is a list of extincted animals.

Fractional Distillation of Crude Oil Essay

Aim: To investigate the substances given off at different temperatures from crude oil (petroleum) mixture. Apparatus: * Fractional Distillation glassware and thermometer * Clamp stand x 2 * Conical flask * Supply of cold water * Rubber tubes x 2 * Test tube rack * Small glass test tubes x 5 * Rubber stopper x 5 * Evaporating basin * Micro Bunsen Burner and bench mat * Wooden Splint * Stopwatch * Boiling stones * Crude Oil supply Method: 1. Set up the clamps stands and the fractionating glassware as shown in the diagram. 2. Connect the rubber tubes to the two open tubes of the condenser. 3. Connect the other end of the rubber tubing to a water tap and let the other one flow into a basin. Turn on the tap. 4. Place two boiling stones into the conical flask and then pour in the crude oil into the flask. Place the flask right above the micro-burner as shown in the diagram. 5. Heat the crude oil mixture slowly. Record at which temperature one of the compounds in the mixture evaporate, and then collect it in the small test tube after it passes through the condenser. 6. Repeat step 5 until maximum temperature has been reached and/or no more compounds evaporate. 7. Test the compounds which were collected. Light them in an evaporating basin and record the time it takes to run out. Results: Data Table of Results of Hydrocarbons tested Hydrocarbon Compound Boiling Point Range (à ¯Ã‚ ¿Ã‚ ½C) Colour Viscosity Pentane 36 – 40 Colourless Very Low Viscosity Hexane 66 – 69 Colourless Low Viscosity Heptane 90 – 94 Very slightly cloudy Viscous liquid Kerosene (Paraffin) ~ 250 Brownish – black High Viscosity Conclusion: These results prove to us that firstly, crude oil being a mixture of several hydrocarbons, that the mixture provided was a simulation. Secondly, there are noticeable trends in the hydrocarbons. As the molecules gets heavier and heavier, by which I mean that we go from pentane to Hexane and so on, the viscosity of the compound increases, as well as the time taken for it to burn up completely. The boiling point also increases. These hydrocarbons belong to the first organic homologous series: Alkanes. Alkane molecules are completely saturated and each carbon atom has at least 2 hydrogen atoms attached to it. Apart from the two end carbon atoms, the other ones are attached to two other carbon atoms each. A covalent bond between a carbon atom and a hydrogen atom is strong, and a bond between two carbon atoms is also strong. It therefore takes a lot of energy to overcome this bond, and hence a higher temperature and more time is needed to break these compounds apart. The more carbon atoms an alkane possesses, the more energy is needed to break it apart. This explains the increasing boiling points, and is also one of the main reasons why hydrocarbons are used as fuels. Kerosene was the only one of the four hydrocarbons which could not be heated to its boiling point and hence the temperature recorded is the one that was given to us. It did, however, last the longest when it was burned. Therefore that result coincides with the one that was given to us. Its other properties which could be verified have given us further proof of the fact that its temperature is higher than the other hydrocarbons’. Also related to the viscosity, the weight of each hydrocarbon also increased as the viscosity increased. By the time kerosene was being handled, a really wide margin of difference could be felt from pentane. Evaluation: Weakness Improvement 1 The equipment available was not enough to determine the boiling point of Kerosene Get a macro burner and heat the kerosene to its boiling point 2 The difference in viscosity between the first two hydrocarbons was hard to tell Measure the poise of the two compounds and record the difference 3 The evaporating basin in which the hydrocarbons were heated was the same all throughout Use a different evaporating basin for each compounds so that the heat from the previous test does not affect the next test 4 The main mixture provided to us was not actual crude oil, simply a simulated substitute To gather all of the compounds found in crude oil use a mixture which contains all of them kind of obvious

Jamaica Kincaid

Place, she uses strong conviction and passion for the island which she grew up on. Although, the reader may view this strong affection very offensive, Kinked generalizes tourists and how they abuse the use of Antigen workers in hotels and tourism while on vacations, seems like she is trying to leave the reader understanding and empathetic. â€Å"Since you are a tourist, a North American or European – to be frank, white – and not an Antigen black returning to Antigen fromEurope or North America with cardboard boxes of much needed cheap clothes and food for relatives, you move through customs swiftly, you move through customs with ease. † Immediately the reader is hit with the second person accusation. Not only the second person, but anyone who has actually traveled to these places. Next we notice the racial descriptions that come off as prejudice and almost ignorant. Kinked acts despondent towards any white individual that tours her homeland because of the poverty there, and also European and Northern American tourists attitude about her, ugly' country.Ms. Kind's assessments are extremely critical, but they also give any reader a new perspective on what locals may think while tourists visit their land. Antigen, from the author's description has a strong workforce within the tourism field, being that its one of the only places needing employees. She uses irony by saying that because white tourists are on vacation they block out whatever negative views are around them, therefore the island they visit is perfect.Kinked slightly interdicts herself when describing the employees as happy individuals because for a tourist the first positive impression from a worker could relay a happy person makes, a happy place. For Kinked to blame the reader or visitors ignorance as the reason for her rash views of her land, Is unjust. Bitterness and resentment are Just a few of the negative tones that the author uses to portray her message. Her poetic way of wri ting may haven't not been the correct approach to reach the reader. Her anger about tourism and the money tourists bring In Is very off putting and offensive. Jamaica Kincaid Place, she uses strong conviction and passion for the island which she grew up on. Although, the reader may view this strong affection very offensive, Kinked generalizes tourists and how they abuse the use of Antigen workers in hotels and tourism while on vacations, seems like she is trying to leave the reader understanding and empathetic. â€Å"Since you are a tourist, a North American or European – to be frank, white – and not an Antigen black returning to Antigen fromEurope or North America with cardboard boxes of much needed cheap clothes and food for relatives, you move through customs swiftly, you move through customs with ease. † Immediately the reader is hit with the second person accusation. Not only the second person, but anyone who has actually traveled to these places. Next we notice the racial descriptions that come off as prejudice and almost ignorant. Kinked acts despondent towards any white individual that tours her homeland because of the poverty there, and also European and Northern American tourists attitude about her, ugly' country.Ms. Kind's assessments are extremely critical, but they also give any reader a new perspective on what locals may think while tourists visit their land. Antigen, from the author's description has a strong workforce within the tourism field, being that its one of the only places needing employees. She uses irony by saying that because white tourists are on vacation they block out whatever negative views are around them, therefore the island they visit is perfect.Kinked slightly interdicts herself when describing the employees as happy individuals because for a tourist the first positive impression from a worker could relay a happy person makes, a happy place. For Kinked to blame the reader or visitors ignorance as the reason for her rash views of her land, Is unjust. Bitterness and resentment are Just a few of the negative tones that the author uses to portray her message. Her poetic way of wri ting may haven't not been the correct approach to reach the reader. Her anger about tourism and the money tourists bring In Is very off putting and offensive.

Travelling Experience

Can you remember your best experince in another country? Last summer (in 2007), I traveled to the United States for working and spending some time with my friends. I stayed two months in that country. I decided to travel because I wanted to do something different. I was bored about all my daily activities, so I decided to take the risk. I traveled alone for getting a job in the same company than a friend of mine. Traveling to the United States was one of the best experiences that I ever had. When I arrived to the United States, a friend of mine went to pick me up.So, I went to his house for leaving my luggage, and for taking a shower. After that, we went to a restaurant and we spent a nice time talking about our lives. At night, we went to a nice night club. I had a very nice day, but I was tired, so we decided to comeback to the house. In the following days, I got a job. I was working for Mc Donald's in the mornings, from 8 am to 3 pm. I really enjoyed my job because I met many peop le from USA and another countries. Sometimes I worked in the Drive-thru window, other times in the kitchen, and also in the front of the store.I had a good schedule because I was busy only in the mornings, so I had much free time in the afternoons. On my free time, I did my daily activities like cleaning the house, washing my clouths and so on. After finishing our activities, we used to have parties in the house. Sometimes we used to go out to different restaurants, and some weekends we traveled to another state named Loussiana. There we had a good time at the Casino, and some other times at a night club too. So, in conclusion, I think it was a nice trip, because I met new people from many places. Besides, I did everything that I wanted, because I had to take my own desicions.

Using and interpreting statistics Essay Example | Topics and Well Written Essays - 1750 words

Using and interpreting statistics - Essay Example There are minimal numbers of diabetics with gene A. The Sensitivity of the study of gene A is equal to 0.22222, which means that the patient with gene A and true gene A rate is quite low. Specificity is equal to 0.38095. Informational data from a study associated with childhood diabetes, informational data from a heart and lung surgery, and informational data from transfusion orthopaedic surgery were collected, tabulated and statistically treated with 95% confidence interval, risk ratio, probability, chi square, mean, standard deviation, standard error.Statistics or data is synonymous to informational figures that can be derived from investigatory processes and whose meanings can be interpreted after analysis.In addition, the development in electronic technology enhances the manipulation of such informational data for close to precise clinical assessments and supervisions. The rejection group has a rate of four (4) or thirteen point thirty three percent (13.33%) gene A. On the other hand, the sure group has a rate of fourteen (14) or forty six point sixty seven percent (46.67); hence there are minimal numbers of diabetics with gene A. The Sensitivity reading of gene A is equal to 0.22222; hence respondents with gene A and true gene A rate is small. Specificity is equal to 0.38095, about one third of the probability of without gene A. So, there is a thirty percent or zero point thirty probability of gene A, the risk of gene A, its estimated probability. The exposed cases probability is 0.4667, while the exposed in control while the probability is 0.1333. The total exposed has 0.3000, with 95% confidence, and an interval of 1.410185 to 27.15574 which include unknown mean . a) The research design used is randomized controlled trial, entailing random allocation of different interventions to the patiens. . b) Using proportion statistics treatment of the informational data on Table 2, the risk of childhood diabetes for individuals with gene A compared with those without gene A can be designed. c) The informational data substantiates Ho: gene "A" is associated with childhood diabetes because fourteen or 46.67 percent representing minimal numbers of diabetics with gene A meant a Sensitivity study 0.22222. So, the small number of respondents with gene A is found with Specificity 0.38095, almost one third of the probability of without gene A. Therefore, 30% or 0.30 probability of gene A in childhood, the risk of gene A, its estimated probability. d) The research intends discovering the possibility of gene "A" being associated with childhood diabetes. Results showed diabetics under the rejection group was rated 4, having 13.33 percent gene A present, while the sure group was rated 14, or 46.67 percent. So, there are insignificant numbers of diabetics with gene A. The Sensitivity gene A is 0.22222, meaning patient with gene A and true gene A rate is small, Specificity is 0.38095, roughly one third the probability of without gene A. Therefore 30% or 0.30 probability is the risk of gene A, its estimated probability. The exposed cases probability of 0.4667 and the probability of the exposed control 0.1333, has a rate of 0.3000 with 95% confidence and interval 1.410185 to 27.15574 with the unknown mean . Question 2 Within four years of hearts and lungs transplantations, a total of 138 organs were received. Out of this, 97 hearts were transplanted or 70.29 percent, and 41 Lungs or 29.71 percent. This means that there were more hearts transplanted than lungs. Negative skew or skewed to the left is indicated by mean value of 46.48454, which is lower than median (50) and median is lower than mode (59). This also means a longer left tail, extreme low scores with low frequency. This implies that there were more adult recipients of heart transplant than young adults. The distribution of the lungs organ in age at transplant was group into smallest and largest. The grouping showed that it skewed to

Final Thoughts on Argument ( 8 ) Essay Example | Topics and Well Written Essays - 750 words

Final Thoughts on Argument ( 8 ) - Essay Example One could claim that marketing cigarette products to the youth is simply too much to handle. First let us examine what prompted cigarette companies to come up with this decision. â€Å"Younger adults are the only source of replacement smokers† (RJ Reynolds). This means to say that as people age – while smoking – signs and consequences of this decision will begin to show. As a result, they wouldn’t be as enthusiastic as they were when they started smoking. This is what many cigarette companies try to avoid. If they want to keep their business thriving and prospering, they need younger adults which will require brand new form of marketing. True – from the industry’s point of view, this may just be the right thing to do. After all, they just mean business and this is nothing personal for them. Without overanalyzing and putting things under simple perspective, cigarette companies are just doing what they need to do to keep up with the current market. But nothing justifies the consequences that will happen in the future. On the surface, this may be an acceptable proposition for many cigarette companies though on second thought they are just taking advantage of our youth – the hope of the future. Why do teens smoke? "Kids are vulnerable to smoking because the transition to adulthood is fraught with stress, insecurity, and the need to be accepted by peers. If kids see smokers who they think are cool or look grown-up, they may strive for that image, too† (Lang and Marks). Judging from this, kids are innocent victims of the adult driven world. Cigarette companies know this vulnerability and weakness and this is the reason why they target this specific market. They know they can earn money from them more than they can from adults who know what they are doing and have other priorities in life already. However, kids don’t realize they are vulnerable and weak. They often have these overly positive views about

Mitochondrial Disease, Parkinsons Research Paper

Mitochondrial Disease, Parkinsons - Research Paper Example [Betelham et al 2007] Mitochondria are large organelles about 1 to 2 micrometer in diameter, upto 2000 of which are present in eukaryotic cells and constitute upto 25% of the cellular volume. The outer membrane enclosing the mitochondria is smooth, while the inner membrane is thrown into a series of folds known as the cristae. The space between the two membranes is called the intermembrane space. Both the structure and the quantity of mitochondria in different tissues can differ greatly depending upon the metabolic needs of the tissue. [Koolman et al 2005] Mitochondria play several vital roles in the normal functioning of the cell. Their most important role is in the production of ATP by oxidative phosphorylation. They also serve as reservoirs of calcium within the cells and play a vital role in inducing apoptosis. . [Koolman et al 2005] The vast range of mitochondrial functions are associated with a range of mitochondrial enzymes. "Pyruvate dehydrogenase, the TCA cycle, beta hydroxylation of fatty acids and parts of the urea cycle are located in the matrix. The respiratory chain, ATP synthesis and parts of the heme synthesis pathway are associated with the inner membrane." [Koolman et al 2005, pg 210] One of the unique features of the mitochondria is that they are a self replicating organelle and can replicate independent of the parent cell. The mitochondrial genome is composed of 37 genes. Of these, "24 specify a mature RNA product, 22 molecular tRNA molecules and 2 molecular rRNA molecules. the remaining 13 genes encode polypeptides that are synthesized on the mitochondrial ribosomes [Strachan and Read 2004, pg 243]. Unlike nuclear DNA, mitochondrial DNA is very compact, lacking exons. For this reason any coding error in the mitochondrial DNA is far more likely to be transmitted to successive generations of the cell. However, because of the large number of mitochondria, the overall effect of such a mutation remains small unless transmitted in a gamete to the next generation. Mitochondrial DNA is exclusively maternal in origin being inherited from the egg, not the sperm. Thus the descendents of males affected by mitochondrial diseases are safe from inheriting the disease. The di seases can however affect men and women equally. [Passarge 2006] Some common mitochondrial diseases include: Lebers optic atrophy MELAS (mitochondrial encephalopathy with lactic acidosis and stroke like episodes) Kearns- Sayres syndrome Some familial types of diabetes mellitus Some forms of progressive nerve deafness and antibiotic associated deafness MERRF (myoclonic epilepsy with ragged red fibres) Pearson syndrome [Naviaux 2008] Parkinsons disease is a degenerative disorder affecting the basal ganglia. It causes degeneration of the dopaminergic neurons in the substantia nigra, leading to decreased inhibition of the subthalamic nuclei and more active inhibition of the cortex. Its is characterized clinically by a triad of bradykinesia, tremor and rigidity. The exact cause for the development of parkinsonism has so far remained elusive. A syndrome very similar to parkinsonism is seen to develop in individuals who abuse methyl-phenyl tetra hydropyridine. This lends support to the theory that environmental factors are responsible for the causation of the disease. The current belief is that genetic and environmental factors both have a role to play. There are no diagnostic tests, and the condition is