Using Microorganisms To Produce Commercial Substances Young People Essay

Using Microorganisms To Produce Commercial Substances Young People Essay Bacteria are a large group of single-celled microscopic prokaryote organisms that inhabit virtually all environments including the air, soil, water, organic matter, radioactive waste, the earthà ¢Ã¢â€š ¬Ã¢â€ž ¢s crust, and the bodies of multicellular organisms. Bacteria vary in their cell structure and mode of metabolism. They are categorized as autotrophs, heterotrophs, lithotrophs, organotrophs, chemotrophs or phototrophs, and exist in various cell shapes such as coccus, bacillus, spirochete, and vibrio forms. They can be divided into two main groups, gram-positive or gram-negative, based on the structure of their cell wall and their reaction to the gram stain. Ecologically, these microorganisms are capable of free-living, mutualistic, parasitic or pathogenic existence. Bacteria are so numerous and diverse, that new species of bacteria are continually being discovered in the environment, and within the human body, as well as that of other organisms. All the species of bacteria known represent only a tiny fraction of the diverse bacterial species present in nature. Although some bacteria cause food poisoning and infectious diseases in multicellular plants and animals, the vast majority is harmless and many are beneficial to natural processes and also to the proper functioning of higher organisms. Bacteria are used in various industrial processes, especially the food industry. Numerous manufactured food products are modified biochemically by bacterial growth in the process of fermentation. Fermented foods produced commercially by bacteria include dairy products such as cheese and yoghurt, vegetable products such as sauerkraut and pickles, various forms of cured meats and sausages, vinegar and soy products. Bacteria are also used in the manufacturing of alcoholic beverages like wine made from grapes and other fruits, beer and liquor made from grains, and tequila made from cacti. The benefits of bacterial fermentation of food products include enhanced preservation, increased digestibility, higher nutrient content and improved flavor. The ability of bacteria to degrade a variety of organic compounds is remarkable and has been used in waste processing and bioremediation. Bacteria are capable of digesting the hydrocarbons present in petroleum and are thus used in cleaning up oil spills. They can also be altered to produce certain enzymes that metabolize industrial waste components that are toxic to other life forms. Bacteria can also be used in the place of pesticides in specific biological pest control. As a result of this specificity, bacterial pesticides are regarded as environmentally friendly, since they have little or no effect on humans, wildlife, pollinators, and most other beneficial insects. The ability of bacteria to breakdown organic compounds to methane gas is widely employed in treatment of sewage. In the chemical industry, the manufacture of ethanol, acetone, organic acid, enzymes, and perfumes rely on the use of bacteria. More importantly, bacteria are used in the production of pure chemicals for use as pharmaceuticals or agrochemicals. The discovery of antibiotic drugs made from bacteria, such as cephalosporin, streptomyces, erythromycin and bacitracin have greatly improved the quality of human life in the twentieth century. Steroids and vaccines used in disease prevention are also produced with the use of bacteria. Because of their ability to grow rapidly and the relative ease with which they can be manipulated, bacteria are the pillars for the fields of molecular biology, genetics and biochemistry. Creating mutations in bacterial DNA and examining the resulting phenotypes, can enable scientists to determine the function of genes, enzymes and metabolic pathways in bacteria, and then apply this knowledge to more complex organisms. This understanding of bacterial metabolism and genetics allows for the use of biotechnology to genetically engineer bacteria for the production of therapeutic proteins such as insulin, interferons, growth factors, or antibodies useful to humans. Another main role of bacteria is the recycling of nutrients in the environment such as carbon, nitrogen, sulfur and other chemical elements used by living things. Saprophytic species cause decay and decomposition of the nitrogenous remains of dead bodies of plants and animals, converting it to ammonia, while chemosynthetic autotrophs like nitrosomonas and nitrobacter, covert the ammonium compounds in the soil into nitrate salts which can be taken up and used by plants. Bacterial populations especially that of genus Clostridium can be used to separate fibers of jute, hemp, and flax, in a process known as fiber retting. These separated fibers are used to make ropes and sacks. Leather, a widely used product is manufactured by the decomposing action of bacteria on the fats present on the skin of animals. The human body is home to a wide range of bacterial species, where they constitute normal flora. The beneficial effects of these bacteria which colonize humans are abundant and include: out-competition of harmful microorganisms, synthesis of vitamin B12, B complex and K, immune system enhancement, regulation of digestive health, absorption of minerals like magnesium, formation of new calls and the regeneration of the gastrointestinal tract. Bacteria that reside in the gut of herbivores secrete cellulase, which is useful in the digestion of the cellulose contents of plant cell walls, the main source of nutrients for these animals. Aquatic organisms also benefit from bacteria that cut down growth of algae and reduce noxious odors, making aquatic environments more conducive to living. It is an undisputed fact that bacteria can and will survive and thrive in the absence of multicellular organisms. Conversely, without the presence of beneficial bacteria, multicellular organisms will be unable to function properly, numerous industrial processes necessary for survival will shut down, and even natural processes like nutrient recycling will cease to occur. The importance of bacteria cannot be over emphasized, and the earth as we know it will definitely take a downward route to degeneration, if bacteria were to cease to exist.

Uranium Mining in Australia

In the last forty years, Uranium has become one of the worlds most important energy minerals. Primarily, Uranium produced in Australia has used for the sole production of electricity. However a small proportion of the Uranium mined is for important medical isotopes. It is for this reason that Uranium mining is an ever-important and pressing point of discussion. Mining itself has been criticized for the massive effect it on the environment around it. Uranium mining is no different, and more often then not, the after effects of Uranium mining are more detrimental to the environment. Unlike other mining, Uranium mining has also caused a major stir in the actual use of the Uranium after it has been mined. The environmental problems of Uranium mining go further then the actual mining and by products. The uses of Uranium have been seen as risky and dangerous. Using Uranium as a source of energy has already shown the disastrous effects. The melt down at Chernobyl is still causing health problems in citizens after 30 years. On the upside, Uranium mining creates employment and boosts the Australian Economy. It is for these reasons that Uranium Mining is a process that needs to be looked at carefully before any judgements are made on it's future in Australia. Chemistry Of Uranium and Uranium Mining In the Earth's crust, mineral Uranium averages about two parts per million. Traces of Uranium occur just about everywhere on earth. In Australia, the existence of uranium has been noted since the 1890's. In 1930, ores were mined at Radium Hill in South Australia for minute deposits of Radium. The Radium was used for medical purposes. As a result of the Radium mining, a couple of hundred kilograms of uranium was obtained and used exclusively to produce colours in glass and ceramics. In 1954 the Government started up a major uranium producer in Run Jungle, known as Rum Jungle Mine. Because of this Australia began to emerge as a potential source of uranium for the world's nuclear electricity production. 1970's large amounts of Uranium deposits were found dotted around Australia. This signaled the start of mines in the Northern Territory such as Ranger and Jabiluka, and also in South Australia with Olympic Dam. Uranium is found rocks of the earth's crust, at 4 parts per million. The extraction (removal) or mining process varies from where the uranium ore deposits are found. Surface cut techniques are used where the uranium ore if found close to the surface. Surface cut mines involved the uranium being found close to the surface, so the uranium is removed from a shallow pit. Fig 1. 0 Ranger Mine found in the Northern Territory. The uranium ore is removed via the open cut mining method. Underground mining is used when the ore is found deep underground. In this process, the ore is removed in a similar fashion to copper; the mine is built in the ground. Olympic Damn Mine in South Australia, relies on the underground mining process. Another way to remove ore is called In-Situ Leaching. It is a popular way to mine Uranium, as it doesn't affect the landscape as much as open cut or underground mining. It is used to remove Uranium filled sand that is found in water in a porous rock, which itself confined in a non-porous rock. In situ leaching involves a leaching liquid (ammonium-carbonate or sulfuric acid) pumped through drill- holes into underground uranium deposits, with the uranium bearing liquid is pumped out from below. Ore mined in open pit or underground mines, unlike in situ leaching, has to be crushed and leached in a uranium mill. A Uranium mill is a chemical plant designed to extract uranium from ore. It is usually located near the mines to limit transportation. In the most cases, sulfuric acid is used as the leaching agent, but alkaline leaching can also used. As the leaching agent not only extracts uranium from the ore, but also several other constituents like molybdenum, vanadium, selenium, iron, lead and arsenic, the uranium must be separated out of the leaching solution. The final product produced from the mill, commonly referred to as â€Å"yellow cake† (U3O8 with impurities), is packed and shipped in casks. The reaction between the uranium ore and sulfuric acid. The UO2 is then oxidised. In some cases uranium has been removed from low-grade ore by a process called heap leaching. This may be done if the uranium contents are too low for the ore to be economically processed in a uranium mill. Heaping leaching is performed by using a leaching liquid (often sulfuric acid) being introduced to the top of the pile of ore. The acid or leaching liquid, percolates down until it reaches a liner below the pile or ore, where it is caught and pumped to a processing plant. This liquid contains the uranium. During leaching, the piles of ore present a hazard because of the risk of release of dust, radon gas and leaching liquid. (referenced from Hardy, C J, 1978, The Chemistry of Uranium Milling, Radiochimica Acta 25, 121-134) Nuclear Mining and Milling has a serious social relevance. The tailings from the Uranium mining have serious health risks and environmental hazards. There are many serious environmental arguments over the mining of Uranium. The mining process itself in Australia has strict guidelines, yet the waste products from the mining process still have an extremely detrimental effect on the environment. Uranium mill tailings (or waste products from the crushing and leaching of the ore) are normally dumped as sludge in special ponds or piles (heaps). These piles/ponds are then abandoned. The amount of sludge produced is roughly equal to that of the ore milled. Long-living decay products such as the radioactive elements Thorium-230 and Radium-226 are not removed from the sludge. This means that the sludge contains over half of the initial radioactivity of the ore. As well as this, unfortunately, due to mainly technical limitations not all of the Uranium present in the ore can be removed in the milling process. Therefore, the sludge (which is the waste product) still contains at least 5% of the uranium present in the ore to start off with. The sludge also contains a variety of heavy metals and other contaminants. These include arsenic, as well as the highly corrosive chemical reagents used during the milling process (such as the sulfuric acid used in leaching). The mining and milling process fundamentally removes the hazardous constitutes in the ore from their relatively safe underground location. Mined Uranium itself does not emit hazardous radiation. Radium-226 found in the tailings continuously decays to the radioactive gas Radon-222. Radon-222 has a decay product that has been thought to cause lung cancer. Radon releases are a major hazard that continues even after uranium mines are shut down. The Radon can escape from the interior of the tailing piles or sludge. Since radon spreads quickly with the wind, many people receive small additional radiation doses. However, in Australia the majority of mines are based away from residential or populated areas. It is a concern for workers though, but with safety apparatus, the risk factor is non-existent. Tailing deposits are also subject to many different kinds of erosion. During and after a heavy rainfall, erosion gullies can form where the tailing deposits are left. Floods can destroy the whole deposit, leaving it dispersed everywhere. Interestingly enough, plants and burrowing animals can penetrate into the deposit and disperse the material, which subsequently enhances the radon emanation and make the deposit more susceptible to erosion. When the surface of the pile dries out, the fine sands are blown by the wind over adjacent areas. Erosion leaves the tailing deposits at a risk of dispersion. Seepage from tailing piles is another major hazard. Seepage poses a risk of contamination to ground and surface water. This water can be transferred to fish that swim in the water, then to whoever consumes the fish. Tailings dams are more often then not, not of stable construction. In most cases, they were made from sedimentation of the tailing sludge. Some are even built on geologic faults. This means that they are at greater risk of an earthquake. Strong rain or snowstorms can also cause dam failures. It is of no surprise that time after time dam failures have occurred. It was thought that bringing the tailings back to where the ore was mined would be an acceptable solution for the tailing disposal. Even though most of the Uranium was removed from the material, it did not mean the material was less hazardous. Most of the contaminants are still present. It is because of the processes the materials have to go through to extract the uranium which leaves the material in a condition where the contaminants are much more mobile (sludge and sand), therefore the material susceptible to migration into the environment. In most cases, tailings have to be dumped on the surface for lack of other options. Here, the protection requirements can more easily be controlled by appropriate methods, but additional measures have to be performed to assure protection from erosion. Uranium mining has also caused some concerns because of where the ore deposits are located. Jabiluka mine is in the heart of Kakadu, a National Park, and also in the mines in the Arnhem region. Aboriginal communities are against the mine sites as they are on their cultural land and heritage. It can be argued however, that with strict regulations in the mining and milling of Uranium, the environmental effects and cultural disturbances can be minimal. The mine-tailing dam should for one not be built on a geological fault. This itself is an obvious way of minimizing the risk of contaminants being released. The site should not be located anywhere near or in the flood plain of rivers, and the level of the dam should be deep. If there is any seepage from the tailing dam, it shouldn't pose a risk to the ground water. During investigation of the site, ground water flow has to be monitored, to allow development of computer based three- dimensional ground water models. These models can be used for prediction of effects of supposed or real contaminant releases. This in itself can show the health and risk factor in the mine tailing. With this technology, we can work towards finding out ways in which to minimize the risks involved with the tailings. The deposits of the clay appropriate for lining and covering the deposit should not be located too far away, and the site should be remote from residential areas. It's these basic guidelines, that when followed, make Uranium mining and milling quite safe and not hazardous to the environment or people (taken from OECD NEA 1993, The Safety of the Nuclear Fuel Cycle, ch 2) To increase the safety of a tailing deposit area, be it a damn or a pile, certain management are applied to reduce the risk of hazardous contaminants being released into the environment. Dewatering of the sludge, smoothing of the slopes, and installation of erosion protection. On top of the pile, an appropriate cover should be installed for protection against release of gamma radiation and radon gas, beginning of precipitation, intrusion of the plants and animals, and erosion. This cover in most cases consists of several different layers to meet all requirements. Moreover, the catchement collection and treatment of seepage water is necessary to release purified waters to the surface water only. In the long term however, water treatment should no longer be necessary. Uranium mining, despite the outcry against the environmental problems it can cause, is quite a positive and good thing for the Australian society. Through the mining and milling process, jobs are created and new skills gained. Unemployment is a big issue in Australia, and by boosting the employment rate, essentially boosting the economy. Uranium mining also brings Australia money through exports. In 1997-98 Australian Uranium accounted for 15 per cent of world production, worth about $288 million to Australia. (Lambert et al, 1996, Australia's Uranium Resources, BRS (expenditure, early resource) Fig 1. 1 Showing the amount of money Uranium export brings Australia Taken from: ‘Australia's Uranium and who owns It' Briefing Paper (Found at http://www. uic. com. au/nip01. htm) Advancements in mining technology will mean that hazardous contaminants in the Uranium tailings can be removed before the sludge is dumped in dams or piles. By doing so, the sludge piles/dams would be of no hazard to the environment and could be used to fill back up the mining sites. At the moment there are strict laws that govern Australian these laws and mine sites, are in place to minimize the risk of hazardous radiation being released from the waste piles (tailing dams, sludge piles etc). Only the future can tell what Uranium holds for us. Uranium mining at the present moment has a lot of controversy surrounding it, and the effects on the environment and cultural groups. It has to be realised that the laws governing Uranium Mining in Australia are strict and dictate how Uranium mining is undertaken. This means that there is little to no risk of the tailings being deposited on ‘risky' sites, and the risk of hazardous contaminants being released into the environment are small. By being sensitive to the views and culture of the Indigenous people, and involving them in decisions surrounding the mine, it won't be long until mining companies and these people come to an understanding or agreement.

Unanswered Questions About Physics Problems That You Should Think About

Unanswered Questions About Physics Problems That You Should Think About Your input along with the last answer is diagrammed for clarity. Thus, any term with viy in it is going to cancel from the equation. Free college physics practice could possibly be precisely what you have to master complex college physics concepts. The college physics study materials are intended to assist you improve. Becoming acquainted with the measures to fix distinctive equations and apply mechanical principles is totally necessary for success. Again, the end result is independent of the order where the subtraction is made. The order of subtraction doesn't influence the results. Get suggestions to help make the task a little simpler. A Startling Fact about Physics Problems Uncovered You ought to understand the connection intimately. You've invented and built a time machine and are happy to utilize it. A number of problems for private study might also be issued every week. If you order aid with math difficulties, you will have the ability to examine the question, learn the specifics of the selected method and control the procedure to guarantee that it's done right. The reply to that problem came with discovery of radioactivity a few decades later. Check that the remedy is reasonable for the issue. You're encouraged to read each issue and practice the usage of the strategy in the solution of the issue. The region of the water column that receives sunlight is known as the Euphotic Zone. Examples of the type of problem are The second problem type is going to be the topic of the next portion of Lesson 2. There are two fundamental forms of projectile problems that we are going to discuss within this class. The variety of issues involving the accession of forces is nearly endless so that it is an impossible task to give examples of every sort of problem. The 30-Second Trick for Physics Problems When the time was determined, a horizontal equation can be utilized to establish the horizontal displacement of the pool ball. The issue asks you to seek out the utmost torque for angles less than 90 degrees, the bigger the angle, the bigger the sine of the angle will be. Whenever that you don't utilize SI units make certain that your measurements are all in the units which you're using. All non-SI units have to be appended at the conclusion of the value. Don't get a lot of individuals who all think alike. In a way, ignoring passions will keep you from going following your vision. There are, strangely, a couple individuals who still think that. Most men and women say they're doing meditation practice to improve different components of their lives which don't have a thing to do with meditation. There are, undoubtedly, lots of writing companies for you to select from, but allow us to assure you that we'll supply you with state-of-the-art support! Sitting meditation practice is fantastic if you wish to practice your sitting. Bear in mind, too, which you would want to create some kind of DIY digging contraption. The Unexpected Truth About Physics Problems In physics, you may use torque to fix rotational motion issues. The remedy to this dilemma is traditionally referred to as the brachistochrone curve. There are two other forms of vector problems which are going to be studied within this chapter, velocity and force. Explicitly show how you abide by the actions involved with solving projectile motion difficulties. The resultant velocity of the object is going to be the vector sum of both velocities. In the majority of cases your diagram is going to be a triangle. Drawing a diagram can help visualize the scenario. Draws a ray diagram together with the worked-out solution. When you're performing physics calculations you always need to keep similar kinds of measurements in the exact same units. The 2 sets of 3 equations above are the kinematic equations which are utilized to solve projectile motion issues. These equations are called kinematic equations. You may want to change drag to a more realistic value in order to create your calculations more accurate.

According to the article entitled Pleasure and Happiness...

According to the article entitled Pleasure and Happiness by Aristotle, there are several points of arguments that view by author about the main things in pleasure and happiness. Pleasure and happiness have an own definition and it distinguish by how people measure on itself. Aristotle was among the very greatest thinkers ever and for the term of pleasure and happiness he started come out with the question like what is the good life and how it related with happy life. Every human action aims at some good and the good which, chosen for its own sake and not as means to an end is the highest good. Thus, based on the Nicomachean Ethics, Aristotle set up the term of pleasure comprise produces a definition pleasure. Based on the article, the†¦show more content†¦It is because pleasure and life are something cannot be separated because we don’t have a pleasure if it not presented by some activity to make a sense of human but Plato define in this article â€Å"happiness as be longing to the class of activities which are desirable in themselves and not desirable as means to something else, for happiness has no want, it is self-sufficient† (Randali et al., 1873, p.382), likely happiness can possession for people who makes different activity and get something their wished for themselves and it can stand alone. There have some comparison between ancient and modern conceptions of happiness and pleasure. The emerged of question like â€Å"in what does happiness contain’? Is the most important and central question in ancient ethics† (Anna, 1993, p. 46). It takes the purpose we need do the comparison based on the Aristotle theory. As we know that it was most influential theory of its times and this theory deals with the complete theory of the relationship between pleasure and happiness. Pleasure is not good neither anything else makes desirable by addition of any absolute good. He argues if desirable cannot consider by a pleasure and cannot be made more desirable by any addition. Next, pleasure is not satisfaction of the natural state, although one may feel pleasure while the process of satisfaction is going on, as he may feel pain while undergoing an operation (RandaliShow MoreRelatedContemporary Ethical Theory Philosophers5014 Words   |  21 Pagesusually contrasted with consequentialist The utilitarians defined the rightness of an action in terms of the happiness it produces as a consequence. Accordingly, moral judgments in effect are a type of factual judgment, a judgment about how much happiness some action produces. Moore and Ross denied that the rightness of an act or the goodness of an end can be defined in terms of happiness or any other natural property or thing. (They disagreed with each other about the relationship between rightnessRead MoreSources of Ethics20199 Words   |  81 Pages48 Implications of Behavioural Genetics Research In Society: 50 How the genes influence behaviour and ethics: 52 2.3- PHILOSOPHICAL: 55 2.31- Contribution Of In Ethics By The Source Of Philosophical Systems: 55 2.32- Contribution of Aristotle: 57 2.33- Contributions By Other Important Philosophers: 58 2.34- Rights Theory: 64 2.35- Contribution By KANT: 65 2.36- Contribution By ROSS: 66 2.4- CULTURAL: 68 2.5- LEGAL SYSTEM: 71 2.6- CODES OF ETHICS: 74 2.61- CompanyRead Morewisdom,humor and faith19596 Words   |  79 Pages111, 122, 126.* â€Å"Religion and humor are incompatible. . . . Humor: the divine flash that reveals the world in its moral ambiguity and man in his profound incompetence to judge others; humor: the intoxicating relativity of human things; the strange pleasure that comes of the certainty that there is no certainty.† Milan Kundera, Testaments Betrayed (1995), 9, 32-33. â€Å"When people ask me if theres an afterlife, I answer, ‘If I knew, I would tell you.’† Art Buchwald,  Too Soon to Say Goodbye (2006)Read MoreA Picatrix Miscellany52019 Words   |  209 Pagesdisorderly book. A glance at the table of contents is enough to show that the sequence of chapters is erratic and closer inspection reveals that the scope of individual chapters is far wider than appears at first sight. Philosophic doctrines (which, according to the author, are the basis of the talismanic art), theory of magic, astronomical, astrological and physical lore, extensive directions for the practice of the art, and accounts of the peoples by whom it is employed are jumbled together throughoutRead MoreInternational Management67196 Words   |  269 PagesThese timely opening discussions transition the reader into the chapter topic. At the end of each chapter, there is a pedagogical feature that recapitulates the chapter’s subject matter: â€Å"The World of International Management—Revisited.† Here we pose several discussion questions based on the to pic of the opening feature in light of the student’s entire reading of the chapter. Answering these questions requires readers to reconsider and to draw from the chapter material. Suggested answers to these â€Å"WIM—Revisited†