The History Of Water Pollution Environmental Sciences Essay

The History Of Water Pollution Environmental Sciences Essay Water is an important natural resource upon which all the living beings rely for their existence and growth. Nature has blessed the earth with uncountable water resources but usable quantity is limited. Hence, it is important to use water sparingly. The irony is, human activities result is high water pollution which further shortens the water supply for use. Water Pollution In an age when man  has forgotten his origins and is blind even to his most essential needs for survival, water along with other resources has become the  victim of his indifference (Carson, 2002, p. 39). Water is considered to be most crucial one among all the worlds natural resources. Although it covers the largest part of the earths surface (70%), yet it is the limiting factor most of the times. This is because most of this water is not available for use in agriculture or for other human needs due to the presence of significant amounts of mineral salts and heavy metals that make water unfit for use. In each home of an American in New York, 99 gallons of water is an average daily requirement (Fishman, 2012). Water consumption increases by a factor of 2-3% each year while the fresh water total supply remains comparatively constant (Dowdeswell, 1996). Thus, the demand of water is a big dilemma today. A major problem related to water is the issue of water pollution. It is basically the contamination of water with pollutants that may be from human, animal or industrial origin. Natural as well as anthropogenic activities lead to the spoilage of rivers, streams and ground water. This polluted water may also move from one place to another leading to water pollution at greater level (Chiras, 2012). Pollutants in surface waters can be of organic or inorganic nature. Processed or un-processed waste material from either animal or human origin can be released into water ways by waste disposal plants etc. Oil spills are also major contributors of water pollution that give rise to organic pollutants. When water gets saturated with this organic waste, bacteria begin to multiply rapidly. Because of the metabolic activity of the micro-organisms, oxygen gets depleted in such water reservoirs. Oxygen depletion may prove lethal to the life of bodies that rely on oxygen for living. The oxygen level in such bodies can be maintained if the organic influx in such water resources is controlled or minimized. The inorganic pollutants in surface water are basically the nitrates or phosphates which increase the plant growth that lead to inhibition of aquatic life. This is because when plants die, their decay leads to oxygen depletion which effects the aquatic environment greatly. Another important phenomenon related to water pollution is eutrophication which is the deposition of nutrients in lakes. These nutrients come from both natural and human sources and may result in aging of lakes prematurely (Chiras, 2012). Some man made products like plastics, medical wastes and sewage sludge also add significant amount of pollutants to the water. Plastic, because of being resistant to degradation is a great environmental hazard. Although direct dumping of sewage is controlled to a great extent, yet a lot of waste is being introduced into oceans and rivers by the sewage treatment plants (Chiras, 2012). Water may also contain infectious pathogenic micro-organisms that may lead to water-borne disease and ultimately deaths. Parasites as well as bacteria seeping into drinking water may lead to chronic diarrhoea, severe infections of ear and stomach diseases (Duhigg, 2009). Contamination of both ground and surface water through chemical pollutants such as pesticides increases production of carcinogens in the public water supplies. According to National Cancer Institute, the danger of cancer from the consumption of contaminated water will increase greatly in future. A study in Holland supported the view that cancer may be caused because of pollution of waterways. Cities which get water from the rivers have a higher mortality rate than those who use water from less susceptible sources like wells. Arsenic is the major pollutant in polluted waters that leads to cancer (Carson, 2002). Pollution control is the need of today to protect human and animal life from the disasters caused by water pollutants. The control can be imposed by two ways: either by the elimination of contaminants from various sources or by adoption of ways that prevent pollution. Legislative control for addressing the problem of water pollution is being applied on the factories and sewage plants. However, no significant improvement in pollution control has been achieved through this way as the pollution from the streets, farm fields and lawns equalizes the industrial pollution. Control of such wastes is although in infancy yet it is gaining popularity as many cost effective methodologies are present to deal with such wastes. The U. S. government as well as some other states have proven to be successful in addressing ground water pollution. This is because ground water is the major source of drinking water in most of the regions. One pollution control strategy is the treatment of the sewage water. In the first phase, larger particles and particulate organic matter is filtered out of the sewage water. The second stage involves the treatment of the sewage water to remove the organic matter that contains significant amount of nitrogen and phosphorus. This treatment involves the use of bacteria or other decomposers. The third and last treatment is ensuring that the sewage water quality is sustained to the level of drinking water (Chiras, 2012). This is accomplished by increasing the Biological Oxygen demand (BOD) and decreasing the Chemical Oxygen Demand (COD) of the sewage water. Recently, a marine biologist Dr. Widder has come up with a technology to fight water pollution through the use of bioluminescent bacteria. These bacteria make use of light for food, predation and finding partners for mating as part of their normal activity. Dr. Widder performed a study in the Indian River Lagoon which according to scientists is valuable and at the same time the most threatened ecosystem of Florida. In her laboratory, she mixed the sediment samples from the estuary with a bioluminescent bacterium, Vibrio fischeri. The concentration of toxic pollutants in the sediments was monitored through the use of photometer that measured the light emitted by the bacteria. It revealed that to what extent and in what time the light fades away as the bacteria get killed by the chemicals. An estimate of the pollutant level in the sediments better indicates the estuarys health status as compared to direct measurement of chemicals in water. Greater concentration of heavy metals like phosphorus and nitrogen were observed to be present in the sediment samples which stimulate the algal growth. These algae affect the estuary life by depleting oxygen. Dr. Widder has also arranged sensors around the estuary that can provide data in real time which along with the sediment toxicity can trace the path of the pollution source. This method is far more cheap and robust than the traditional practice of taking samples to labs for purpose of analysis (Olsen, 2011). Other than these measures, there is a need of shift of human activities towards the ones that are eco-friendly. Biodegradable plastic should be produced by most of the factories and industries instead of non-degradable plastic that is toxic for health. Moreover, oil spills should be removed from oceans through use of bacteria which can degrade the organic compounds in those oil spills. Better and more economic water treatment strategies should be devised in the future to deal with polluted water. Moreover, ways should be discovered to overcome the shortage of water in near future.

Dental

Tray setups Here is a series of tray set ups for some of the more usual dental procedures. Every operator is different and the tray set ups need to be customized for the operator. Keep tray set ups simple. Also shown are some of the corresponding bench set ups that need to be prepared for specific purposes. Tray 1: Examination Mirror Probe Tweezers Periodontal probe Bench Patient card Pencil for charting Intra-oral camera set up ready to go Hand mirror for patient to view mouth Tray 2: Prophylaxis and fluoride treatment Mirror, probe and tweezersHand scales and/or ultrasonic scales tip Rubber cup Suction tube Prophylaxis paste in ring cup or disposable dish Floss Gauze squares Cotton rolls Fluoride trays or pellets and disposable dish Fluoride solution Model for oral health instruction Tray 3: Amalgam restoration 1 Spoon excavator Flat plastic Amalgam plunger Amalgam carver (every operator has their favorite) Ball burnishes Locking tweezers Tray 4: Amalgam restoration bench Amalgam g un Dapper dish Matrix retainer and band Decal applicator Wedges (where necessary) Amalgam capsule Articulating paper with holderLining material Tray 5: Amalgam restoration 2 Tray 6: Composite / GIG restoration Plastic instrument – temple or Teflon Tray 7: Composite / GIG restoration -? bench 1 Pellets or sponge applicators, Articulating paper Spatula Mixing pad Restorative material Tray 8: Composite / GIG restoration -? bench 2 Pellets or sponge applicators Tray 9: Extraction Sterile gauze Tray 10: Extraction, mandible -? Elevators Forceps Anesthetic set-up Extra gauze bench Instructions for care after an extraction. Tray 1 1: Endicott treatment Endicott probeEndicott spoon excavator Endicott ruler For root canal therapy / root filling you will need to add the following instruments to the Endicott tray: Lateral spreader's Endicott plungers Heat out instrument (for cutting and sealing the GPO points) Tray 12: Endicott treatment -? K files Paper points Medicament's Cavity Mixin g pad and spatula Periodical X ray films Guts perch points Tray 13: Rubber dam 1 Frame Rubber dam clamp forceps Rubber dam punch Appropriate clamp Rubber dam square Tray 14: Rubber dam 2 Tray 15: Oral health education / disclosingLocking tweezers with cotton pellet Toothbrush Microbes Disclosing solution Baseline in small container Denture dish / container Air-abrasion -? tray Teflon instrument or temple composite Air abrasion head and nozzles Air-abrasion -? bench Similar to composite/glass-monomer set up Endicott -? tray Endicott-? bench Periodical films Rubber dam application Oral surgery -? tray Retractor Scalpel handle Peritoneal elevator Erroneous Bone file Tissue tweezers Hemostat Surgical curette Irrigating syringe Suture/surgical scissors Needle holder Surgical aspiratorOral surgery -? bench Scalpel blade of choice Suture needle and thread of choice Saline solution for irrigation Extra gauze-sterile Mouth props if needed Surgical burs of preference Extra cup of water to run through aspirator to avoid clogging. Denture trays Impressions Bite registration -? tray Wax knife Wax carvers Bite registration -? bench Models Bite wax Matches Shade guide. Laboratory Job sheets Try-in -? tray Try-in -? bench Hand mirror for patient Denture issue Denture issue -? Bench The dentures Hand mirror Burs required for acrylic trimming. Dental Dentistry isn't Just a profession; it's a way of life. Helping others is the best way to live, and that's exactly what you do. â€Å"Blessed are those who hold lively conversations with the hopelessly mute, for they shall be called dentists† (Ann Landers). We all dread our next go around at the dentist. Getting our teeth cleaned, drilled, pulled, and any other horrible exploit being done to our poor teeth. What our dentist is doing (besides invading our mouths), is protecting us from any diseases that could otentially form in our mouths.A dentist is â€Å"one who is skilled, licensed and practice the prevention, diagnosis, and treatment of diseases, injuries, and malformations of the mouth. † There are many factors into becoming a dentist. To become a dentist, one must attend dental school. The dental school must be accredited by the American Dental Association (ADA). In order to be accepted into any of the 56 (2006) dental schools in the United States, you must complet e two years of predental education. Most people geta bachelor's degree.In order to be accepted into dental school, you must first take the Dental Admissions Test (DAT). In the first year of dental school students normally take science classes like microbiology, pathology, or anatomy. In the next years the advance to more dental-based classes; which includes going to laboratories and getting hands-on experience. Most dental students graduate from a dental D. M. D or a D. D. S in four years. A work day for a dentist varies every day. The field is often challenging due to the difference in people's mouths.You constantly have to build more knowledge due to the fact that each patient is different. Dentist's generally look over the patients records in the morning before their appointment. From there; they will practice what is necessary on the mouth of their patient. Whether it being drilling teeth, extracting teeth, removing decay and filling cavities, to prescribing medicine. Due to the ir flexibility; dentists get to choose whether they want to work full-time or half-time. Full-time dentists average about 63 patients a week.

Factors Affecting Sporting Performance

Several factors affect our sporting performances, some of which are ‘natural' factors, and some of which we cause. An example of a natural factor is our gender. We do not choose to be male or female and therefore it is something that occurs naturally. An example of a factor caused by ourselves is our diet- what we eat and drink. We can decide what we want to eat be it healthy or not healthy, the decision is ours. Age is a natural factor affecting performance. When you are very young, your bones and muscles are still growing and because your bones are still growing they are a lot softer than a fully-grown adults are. This helps young children to be very flexible and very supple, which in turn affects their performance. But being fully-grown in some sports is better than young and supple. Because adults are fully-grown, they are a lot stronger than a child is. All the muscles are developed properly and so in a sport such as cycling it would be an advantage to be a fully-grown adult than a developing child, whereas in gymnastics it would be an advantage to be very supple because of the certain exercises involved. Our gender affects our performance a great deal. A mans frame is generally wider and taller than a woman's is. Women after they reach puberty develop wider hips which hinders their running ability, whereas a man develops larger muscles due to the increased level of testosterone in their bodies. Women generally have muscles smaller than a mans, so men have a head start already in any power sports such as weightlifting or sprinting which require a lot of physical strength. The size of your internal organs affects performance, in that if you have for example larger than average lungs, you can inhale an awful lot of air which contains oxygen, and so more oxygen can be sent to the muscles to keep them going for longer. Similarly if you have a healthy heart, it can pump the blood to your muscles quicker. And contained in the red blood cells is the oxygen that your muscles need to keep working. Having a healthy heart and large lungs can be a great advantage in an endurance sports event such as rowing or cross-country running. The use of drugs, banned substances, cigarettes and alcohol all effect the way in which we perform in sports. Drugs affect our performance in a positive way. They make us more alert, bulk up muscles and improve strength, increase speed and stamina, and get lots of oxygen to our muscles. Apart from cheating by taking drugs, they ruin our internal organs such as the liver and kidneys. In some cases drugs ruin your fertility because of the effect they have on the body. Cigarettes affect the way the heart and lungs work. The lung capacity of a smoker is considerably less than a non-smoker. Because the lung capacity is less than normal, this means that less oxygen enters the body and less oxygen goes into the red blood cells which are supposed to take oxygen to the muscles. Because of the lack of oxygen in the muscles, they can't work as well as usual. And if the muscles aren't working properly you can't play any sport well. Alcohol slows down reaction time and de-hydrates the body. If your reactions are slowed down in a fast game such as squash, it is likely that you will lose because you have to be alert at all times and if alcohol is present in the body, your performance will be affected. Your diet is very important if you want to stay fit and healthy. If a professional athlete changed their diet to one with sweet and fatty foods it would affect their performance, because too much sugar and fat in the body is unhealthy and it makes you gain extra weight to carry around when you are in action. If the diet you currently have has too many bad things in it, it can start to strain your heart. If you have a very well balanced diet, which is full of fresh fruit and vegetables it keeps your body healthy and full of energy. Also, if your diet lacks a certain amount of sugar, you can have low energy levels which makes your body work slower and not up to speed. It is good to take certain vitamin supplements to make sure that your body is totally up to scratch and eating plenty of foods with iron and different minerals. Illness is quite a major factor in your sporting performance. If you have just started to recover from flu or a bad virus, your body will be very weak from fighting off the virus because lots of your energy is taken up by getting better, so if you went down to a football pitch and tried to play 90 minutes of football the chances are that your performance will be very poor because your muscles will be tired, you won't be very alert and you will be fatigued and lethargic. An athlete who is clear from illness is far more likely to give a very good performance because they are fully fit, alert, and not tired. The environment makes a difference in most outdoor sports. Athletes who train at high altitude have an advantage, because there is a higher level of oxygen in the air and so more oxygen gets into the blood and to the muscles so they can keep going for longer in for example a marathon run or rowing. A high level of pollution in the air also means that there is difference in oxygen level, but instead of being higher like in high altitude, it is lower due to the impurities in the air. If there is less oxygen, less can be brought into the body, and so the muscles don't receive the necessary oxygen, so they can't work as well. The weather also makes a difference in performance outdoors. During a sprint race, if there is a wind blowing towards the athletes, it will be harder for them to run at a world record pace, because they have to work harder to run into an opposing force. Heat affects sprinters as well, if it is too cold, their muscles sometimes are not warm enough, so they could get injured or pull a muscle. If it is warm or even hot when they are running, their bodies and muscles will already be warm and ready to go, so when they are running, their muscles will be working at their best. Your lifestyle is a very important to keeping fit and healthy. A good active lifestyle will result in a healthy body. If you do plenty of exercise and eat healthily you can train for a sport easier, and your body has already set the foundations to keeping fit and keeping up with training. If you get little exercise and stay indoors most of the day, your body will be used to not doing anything too energetic, so if you suddenly go out and do an intense training session the chances are that your body will not be able to cope.

Value of Philosophy Essay - 971 Words

Philosophy is the study of examining and thinking about questionable ethical problems and/or generally accepted certainties. Philosophy aims at knowledge that combines a variety of academic fields as well as convictions, prejudices and beliefs. What is Russell’s essay about? Present Russell’s position in your own words. Bertrand Russell’s essay addresses many issues concerning philosophy. In the writing, he states philosophy’s nature, value, and criticisms. The essay explains these aspects of the study of philosophy in relatively different ways. The main idea for establishing value in his essay is by explaining how it is best obtained, and its effect on other people. The essay continues with his criticisms of those who opposed†¦show more content†¦It states that even though philosophy doesn’t give us a certainty of true answers, it suggests many possibilities which enlarge our thoughts and free them from tyranny of custom. He also supports the idea that philosophy is beneficial because it â€Å"enriches intellectual imagination†. The essay brings up the points of the practical man, and why they are at a loss of intellectual imagination because they don’t explore the unknown by viewing life as simple. As evidence, he uses an example of mass disease a nd poverty of a society. The theory is that in those conditions, there would still be much to be improved to produce a valuable society. Even if the society has the proper food supplies, they need the ‘goods of the mind’ (knowledge) to build a well-governed society. He believes practical men undermine that aspect, thereby explaining their lack of intellectual imagination. The next argument is that philosophy saves us from convictions, prejudices, and cultural beliefs. The affect that that has on a person is to open up a fresh prospective with very little bias. He believed for this to be beneficial to people socially, by developing empathy which helps you understand others points of view. That theory goes hand-in-hand and gives a fine segway to his fourth and final argument of â€Å"the freedom and equity learned from philosophical contemplation reflecting in your personality (action and emotion). TheShow MoreRelatedThe Value of Philosophy Essay754 Words   |  4 PagesThe Value of Philosophy The word â€Å"philosophy† is derived from two ancient Greek words, â€Å"philos† meaning ‘love of’ and â€Å"sophia† meaning ‘wisdom’. Philosophers are lovers of wisdom. They have had the time and resources to sit back and wonder about what things really are like when all the pieces are fitted into one final accounting. The history of philosophy is generally divided into four stages or periods. Ancient philosophy covers Greek and Roman philosophy. Medieval philosophy deals withRead MoreThe Values Of Philosophy : Questions1017 Words   |  5 PagesName Instructor Course Institution Date The Values of Philosophy Question #1 String theory seeks to explain the origins of universe and combines the four forces of nature. It is apparent that it was impossible to integrate the theories of quantum mechanics and general relativity before the string theory. For three decades, string theory has played a key role in theoretical physics because the theory explains the Big Bang that took place some 300 billion years ago, which led to violent riseRead MoreThe Value Of Philosophy : Lord Russell1522 Words   |  7 PagesValue is defined as something that is considered important or beneficial. Philosophy is a rational argument about the â€Å"big questions† such as knowledge, love, ethics, morals, etc. Philosopher Lord Bertrand Russell stated that [p]hilosophy is to be studied not for the sake of any definite answers to its questions, since no definite answers can, as a rule, be known to be true, but rather for the sake of the questions themselves; because these questions enlarge our conception of what is possible, enrichRead MoreThe Value Of Philosophy By Bertrand Russell803 Words   |  4 PagesThe essay The Value of Philosophy by Bertrand Russell suggests that many â€Å"practical† people view philosophy as rather useless, because these people are – according to Bertrand Russell – operating both with wrong conceptions about the ends of life and wrong conceptions about what goods philosophy strives to achieve. According to Russell the value of philosophy is in what it does for the person who studies it. He makes the point that goods of the mind are as important in life as goods of the bodyRead MoreThe Value of Philosophy Essay example604 Words   |  3 Pages9:30 T/Thu Philosophy In Russell’s discussion â€Å"The Value of Philosophy,† he asserted that the true goal of Philosophy wasn’t a tangible, or even reachable, goal. He says that Philosophy won’t lead us to any definite answers, because once you acquire solid knowledge of a subject, it instantly becomes another science. Instead that the greatest value of this study comes from the mental freedom you get when you begin to question the status quo and not just accepting things as they are. He also saysRead MoreThe Value Of Philosophy And Its Influence On Society1271 Words   |  6 PagesThe value of philosophy lies in its ability to influence a society and/or provide wisdom to others. Often philosophy is mistakenly thought of as inadequate compared to science. Breakthroughs in medicine allow us to live healthier and longer lives; While technological advances allow for a more connected and convenient world. Despite popular belief, philosophy is just as evident as science in advanc ing society. Contrary to the empirical measurement’s that science provides, philosophy provides wisdomRead MoreThe Value Of Philosophy By Bertrand Russell1959 Words   |  8 PagesThe Value of Philosophy In Bertrand Russell’s article â€Å"The Value of Philosophy† in his The Problems of Philosophy, he may as well be looking at the problems of his argument. Russell does reach his purpose and is able to make valid conclusions that are well supported for why and how philosophy is valuable, but his credibility can be called into question. He makes cases that allow for weaknesses and sets limitations on what he says. It is limitations he puts on how he defines philosophy and the weaknessRead MorePersonal Value Philosophy Paper1461 Words   |  6 Pagesassessment tool used to analyze one’s perspective and style thru a series of questions asked and answered. The tool provides deeper insight into an individual’s core belief system. The tool refers to four broad characterizations represented in ethical philosophy. This tool was used by the writer for an Interdisplinary Capstone class taken in January 2007. The writer learned her ethical perspective is most likely to be based on a blended profile Character and Obligation, and her least ethical perspectiveRead MoreThe Philosophy Of Health Policy Values871 Words   |  4 PagesHealth Policy Values As human beings, we all have our own values, beliefs and attitudes that we have developed throughout the course of our lives. Our family, friends, community and the experiences we have had all contribute to our sense of who we are and how we view the world (The Gospel Coalition, 2014). Values are principles, standards or qualities that an individual or group of people hold in high regard. These values guide the way this author lives and the decisions made throughout my life.Read MoreMarket Management Philosophies : Concept Of Value2619 Words   |  11 PagesMarket Management Philosophies Concept of Value Value is considered to be an important constituent of marketing and the ability of a company to provide superior value to its customers. The essential idea of marketing is offering customers superior value (Doyle, 2008). By adding more value to commodity, companies seek to improve customer satisfaction so that bonds are strengthened in order to achieve customer loyalty. The most frequently used definition of value is that value is relationship between