The Ideal Old Man Essay Example for Free

The Ideal Old Man Essay The initial reason for designing and constructing the Maglev vehicles was to create a car that could both carry a high number of people in a quick amount of time, and be the most cost efficient. Unfortunately for me, a high number of people would not be able to squeeze into my car. A slow, yet steady and comfortable pace made it quite obvious that my car was not in the upper echelon of the class. Instead however, it found its own identity as being ideal for an old man. Freedom rides through the countryside would be this cars specialty. In preparation for our upcoming project, we first watched a video on modern day Maglev vehicles. In the video we learned about the theories of magnets and electricity working together to form a high-speed vehicle. We learned about the futuristic possibilities of traveling from New York to Washington (without spilling your coffee) in relatively short time. The main purpose of a Maglev vehicle is for mass transportation in a quick amount of time. After we were introduced to the Maglev vehicle in the video, we proceeded to the computer lab to peruse the Internet. On the Internet, we found a variety of current Maglev vehicles. We got to check out the various speeds and performances that these particular vehicles had. In the making are some more elite types of Maglev vehicles. Perhaps someday in the near future, there will be a Maglev line running through our very own town. It was now time to plan out a strategy on the design of my car. The very first thing I sketched out was how wide the track was. A car any wider than the track would obviously not be able to run. Also, the magnets had to be a little more than an inch separated apart or else the magnets would not function properly. My completed sketch was a relatively small car that would be able to fit approximately 7-10 passengers at a time. One motor was supposed to rest on the top of the rear end and act as a propeller. Once my advisor approved my sketch, I looked for the proper materials in making my vehicle. The first thing I found was the material for my body. A light Styrofoam material was perfect for the design of my car. I cut out the proper design and also placed a shield of protection on it. Once the basic body was established, I found a base made of a hard light plastic. The plastic was easy to cut so that the contours of my base would match that of the car. Once I had my body and my base all set, I needed to install the ingredient that makes it all happen, the magnets. You could not just plug the magnets on the base in any sort of arrangement that you want. The magnets have to be placed on in rows approximately one inch apart. Also, the magnets (once they are placed on) must repel the force given off of the track so that the Maglev vehicle can float. After the magnets were carefully put on, it was time to install the motor system. The motor system consisted of one motor, two wires, and a propeller. The two wires would touch the side of the Maglev track and generate power inside the motor, which would turn the propeller. Once my motor system was installed, I was ready to test out my product on the track. Something was wrong. Placing my vehicle on the track was no different than trying to drive a car while it is elevated, the motor was humming but it wasnt moving an inch. Upon observation, I concluded that my car had too much weight pushing down on the magnetic track. The one thing I could do was to hollow out the insides of the Styrofoam, which would reduce much of the weight. Well, that didnt do too much. So I continued to chop away at the body of my car. Each crucial chop eliminated the passenger rate of my vehicle. Eventually the weight balanced out when my vehicle totaled the passenger rate of 1. 5. Saddened by the loss of passenger space, I was happy to see that my vehicle could at least move. My vehicle was now completed. All it needed was a purple colored body, and a beautiful purple baseball No. 4 for good luck. A cheap car to build, it only cost a shade over $57 million ($50 million going into labor). Measurements concluded that a mere 1. 5 passengers could jam into my cars tight surroundings. With the knowledge of my car being a one man wrecking crew I tested it on the track to see how much speed my puppy could burn. Once the results came in, it was time to label my Maglev car ideal for the old man. A respectable average speed of 4. 75, my car will not pass the board of transportations expectations. However, if the time comes for personal Maglev use in the future, people can come to either me or Q. Some controversy was brought up in aspects to the motor. A more efficient gold motor was placed on some of the other vehicles, and showed that they performed at a higher speed. Would my car have broken record speeds with this gold motor? Although my car would not have passed the expectations of the Maglev transportation theories, I did learn a lot about how electricity and magnets can work together. I learned that the Maglev is a mode of transportation for the future. A low (if not zero) pollution percentage, a Maglev would be ideal to the ozone. I found it amazing how the vehicles actually float down the track. The main problem for me was the weight factor. For some reason, I wasnt able to carry a space wide enough to fit any more than two passengers. Speculation could lead to bad magnet placement on the bottom. If I could do it again, I would design a car that distributes the weight more evenly throughout the base so I could fit more passengers. I would also look into purchasing the gold motor for higher velocity. I thought it was a fun project and I recommend it to future generations of classes.

Oxygen Essay -- essays research papers

Oxygen Oxygen, symbol O, colorless, odorless, tasteless, slightly magnetic gaseous element. On earth, oxygen is more abundant than any other element. Oxygen was discovered in 1774 by the British chemist Joseph Priestley and, independently, by the Swedish chemist Carl Wilhelm Scheele; it was shown to be an elemental gas by the French chemist Antoine Laurent Lavoisier in his classic experiments on combustion. Large amounts of oxygen are used in high-temperature welding torches, in which a mixture of oxygen and another gas produces a flame of much higher temperature than is obtained by burning gases in air. Oxygen is administered to patients whose breathing is impaired and also to people in aircraft flying at high altitudes, where the poor oxygen concentration cannot support normal respiration. Oxygen-enriched air is used in open-hearth furnaces for steel manufacture. Most of the oxygen produced in the United States is used to make a mixture of carbon monoxide and hydrogen called synthesis gas, used for the synthesis of methanol and ammonia. High-purity oxygen is used also in the metal- fabrication industries; in liquid form it is of great importance as a propellant for guided missiles and rockets2. I have chosen the element "Oxygen" because without Oxygen, human beings would not be able to live. Oxygen is probably the single most important element...

Electronic mail will out perform the regular Postal Service Essay

New technologies have always allowed us to do things faster, more efficiently and more professionally than ever before. Generally, every new technology is a step forward for speed and productivity. The speed, usage, reliability, and expense make electronic mail more desirable than our general postal system. The speed of transfer is an important part of the decision to send mail by either E-Mail or Postal System. E-mail has a distinct advantage in this category. With the click of a button, ones message is sent. Whether you are sending an e-mail to a person across the street or to Afghanistan, the transfer rate is virtually the same. The Postal Delivery System takes from two days to two weeks to deliver even the smallest package. Depending on the locations of the sender and the receiver, even sending a letter to the house across the street takes unnecessary time. Another variable aspect of the two mail systems is ease-of-use. E-Mail has advantages when viewed from this angle. For one thing, E-Mail has no limitations on pick up or delivery. Anyone who wishes to use E-Mail may do so on his or her own leisure. When receiving letters from the Post Office waiting is a major inconvenience, taking time out of the person’s day. In addition, writing a letter by hand often allows room for error. The E-Mail user also has to pay a monthly fee for an internet account, generally ranging from eight dollars to twenty-five dollars per month, and the user may send unlimited E-mails. Local Post Offices charge for envelops and packaging material. The cost of a stamp is thirty-seven cents for each letter. This cost adds up when mailing three to four letters a day. Reliability of E-Mail far outweighs the Postal System. Because a computer network runs e-mail, human error is unlikely. Consequently, E-Mail is usually transferred to the correct address; it is never lost, stolen, and its contents are never removed or damaged. On the other hand, the Postal System has more problems. Since humans deliver the envelopes, error is very  common. Letters are often delivered to the wrong address creating delay for the intended recipitant. In addition, dishonest postal workers have stolen checks and other items out of packages. When choosing how to mail letters, think about the most used system in the world of today. E-Mail is a system that rarely looses or damages letters, and offers fair and low rates. Even though the Postal System offers low rates, the speed and safety of delivery is sacrificed due to unqualified and dishonest employees. E-Mail is instant, cheaper, and most reliable way to send letters.

Listing and Speaking

Skill Development: Fear of public speaking http://www. youtube. com/watch? v=a56v2PSUQy8&feature=related Proactive = controlling a situation by making things happen or by preparing for possible future problems Myth = an idea or story that is believed by many people but that is not true Come across = to make a particular impression Overwhelming = something that is so confusing or difficult Optimal = best or most effectiveProfound = major, significant Intimate = having a very close relationship Overcompensating = trying to make up for something that is lacking or bad by doing too much of something else Rehearse = to say or do (something) several times in order to practice Backfire = to have the opposite result of what was desired or expected Interpretation: Keys to Successful Interpreting: Consecutive Interpretation Note-taking http://www. youtube. om/watch? v=ddRk2pvzsVQ Rambling = lengthy Incomprehensible = beyond your understanding Furiously = rapidly Decipher = make sense of Scribb le = scrawl = jot down Groping around = searching blindly or uncertainly Consign = transfer Delegate = a person who speaks or acts on behalf of an organization at a meeting or conference Encapsulate = summarizeHindrance = obstacle Politics: Palestine http://www. youtube. com/watch? v=qANkb5hUUfo Resolution = decision |Contend = argue | |Confrontation = conflict |Negotiate = discuss | |Implicit = hidden |Accountability = responsibility | |Partition = separation |Demolish = destroy | |envisage = imagine |Get away with = escape | |Territory = area |To be held accountable = held responsible | |Disputed = undecided |swirling = twisting | Linguistics: Language acquisition http://www. youtube. com/watch? v=pmsQJfyVrr0&feature=related instinctively = intuitively |species = basic category of biological classification | |isolate = separate |defect = a shortcoming, fault, or imperfection | |multitude = large number |mutation = change or alteration | |cognitive = mental |disorder = a disturbanc e in physical or mental health or functions | |breakthrough = sudden discovery |version = a particular form or variant of something | Technology India Launches World's CheapestTablet Computer for 50$ http://www. youtube. com/watch? v=oQXQVuaJ43o;feature=related sneak peek = an opportunity to see something before it is officially available gadget = small device or machine with a particular purpose port = in computers: a data connection in a computer to which a peripheral device or a transmission line from a remote terminal can be attached. HD= high definition = a system which produces very good quality television images in greater detail than ordinary systemsDebate: How to Change http://www. youtube. com/watch? v=zSb5BmIfNhI maverick |unconventional person | |entrepreneur |capitalist | |leap |jump | |rash |reckless | |enhance |improve | |attribute |quality | |philanthropy |charity | Religion and Culture convert |change | |committed |devoted | |preach |give a sermon | |polish |improve | |by the stack |a great deal | |unequivocally |clearly | |manuscript |document | |authentic |true – original |salvation |saving | |embrace |accept | Positive Psychology How to be Happy: http://www. youtube. com/watch? v=ilry-1-ucnA;feature=related pursue = continue elusive = hard to find fugitive = difficult to get evolutionary = gradual process in which something changes into a different and usually more complex or better form ingrained = very difficult to change propensity = a strong natural tendency to do something mechanism = a process or system that is used to produce a particular result o endure = to continue going through something unpleasant sustain = to provide what is needed for (something or someone) to exist hedonic treadmill = the tendency of humans to quickly return to a relatively stable level of happiness genetic set point = baseline habituating = make or become accustomed or used to something. hard wired = functions that are innate and unlearned in living s ystems lottery savoring = enjoying mindfulness = being aware of fruition = realization virtues = good and moral behavior analogy = a comparison of two things sensation = a particular feeling or effect that your body experiences cultivate = to improve or develop

Lifespan of Adults of Dementia in Developed Countries Compared to Developing Countries

Lifespan of Adults of Dementia in Developed Countries Compared to Developing Countries Introduction Background Information Aging of the world’s population, along with the fast-growing life expectancy, results in increased expenditures spent on health care services.Advertising We will write a custom research paper sample on Lifespan of Adults of Dementia in Developed Countries Compared to Developing Countries specifically for you for only $16.05 $11/page Learn More Older age is closely associated with high rates of chronic diseases. In this respect, dementia is considered to have had a serious impact on the quality of life, as well as on the economic burden that family should take. At the current moment, dementia treatment refers to advanced medicine and novel approaches to cope with the increasing number of cases. However, the ineffectiveness of treating dementia has a negative impact on life expectancy in aging societies. The global trends in aging undergo significant changes due to the influence of external factors, including economic , political and social challenges. This is of particular concern to the evident difference in the distribution of adults with dementia in developing and developed economies. The recent explorations of the problem have indicated the tangible impact of environmental factors on dementia development (Prince, 2000). In particular, because the mental disorder is considered a significant problem in the developed world with increased rates of aging population, it has considerably higher rates in the developing economies. The evident distinctions, as well as demographic transitions, have negative consequence for the dementia spread among the developing world’s population. The research studies by Wang et al. (2008) have recently discovered that dementia is the core reason for economic burden among the aging population in developing countries. Such a situation is explained by insufficient education, as well as poor health care services tailored to the patients’ demands. Attention should also be given to the cross-cultural survey of people with dementia in the third world. Research studies in such developing regions as Latin American, Africa, China, and Southeast Asia are indispensible to define how lack of education, poor health care network, and community perception affect dementia diagnosing (Prince et al., 2003). Considering culturally and economically sensitive environments of the developing countries is vital for evaluating the differences in incidence and prevalence of the disease among the identified populations. Purpose of the Research Although the developed world recognizes dementia as a serious threat to the aging population and overall demographics, little comparative analysis has been done on the assessment of the situation in both developing and developed worlds to define what external and internal processes influenced the lifespan of adults with dementia.Advertising Looking for research paper on psychology? Let's see if we can help you ! Get your first paper with 15% OFF Learn More This is of particular concern to such issues as cultural diversity, economic impact, political situation and education serving as the comparative tools of the analysis. Therefore, the purpose of the research lies in defining what underpinnings influence greater lifespan of people with dementia in developed region, as compared to the developing world. Main Discussion Influence of Dementia on Life Expectancy Numerous researches have been dedicated to the analysis of the connection between dementia and life expectancy. In this respect, Xie (2008) states, People with dementia have markedly decreased survival rates compared with those without dementia and are two to four times more likely to die at a given age than those of the same age without dementia (p. 259). Even minor cognitive disorders can have a negative impact on the survival mechanisms of individuals and, therefore, it has direct relation to the risk of mortality. The degrees of mortality of people suffering from dementia are largely predetermined by such characteristics as sex, age, demographic characteristics, type of dementia, and genetic information. Higher risks of mortality are observed among older people (Xie, 2008). Gender characteristics are considered less important in defining the impact of dementia on life expectancy. The studies produced by Routree et al. (2012) have also provided evidence concerning the strong dependence between greater probability of dementia disorder among males of older age and slower pre-progression rate. The evident connection between the age of the patients and survival rates explains the survival mechanisms and the necessary health care assistance. Within this context, the lifespan rates among the patients will largely depend on economic and political realms within which these patients are placed (Waring et al., 2005). In this respect, the overall impact of dementia is closely associated with the quality of health insurance, economic and social conditions under which the individuals are treated. Analysis of Economic Aspects Influencing the Lifespan of People with Dementia in Developing and Developed Countries On the one hand, the previously discussed studies point to the direct influence of age on life of people with the disease. On the other hand, the survival probability can significantly be increased with the introduction of advanced technologies, medication, and quality of health care delivery. In this respect, Kalaria et al. (2008) have defined that, although mortality rates predetermined by poverty, communicable diseases, and human conflicts, number of individuals with dementia have augmented in the developing world.Advertising We will write a custom research paper sample on Lifespan of Adults of Dementia in Developed Countries Compared to Developing Countries specifically for you for only $16.05 $11/page Learn More The current evidence suggests that age-predetermined dementia observed in individuals under the age of 65 is higher in such developing regions as Latin America and Asia than in India and sub-Saharan Africa (Kalaria et al, 2008). Moreover, education is considered the decisive factor in development of the disease because illiteracy increases the potential risk for dementia emergence. Rapid expansion of patients with dementia in the developing countries is strongly associated with the financial resources invested in treatment and prevention schemes. In particular, the costs spent on treating dementia in the developing countries reach about $ 73 billion annually (Kalaria et al, 2008). However, the actual care demands for social protection are much higher than the actual budgeting. Therefore, lack of sufficient financing in developing economies constitutes the core reason for the increased rates of dementia among patients, as well as their shorter level of life expectancy (Rooij et al., 2011). As a result, greater demand for residential care should be introduced in the future to prevent the expansion. In contrast to the economic environment in developing countries influencing dementia treatment, the developed world manages to spend significant part of financial resources to cope with the problem (Rooij et al., 2011; Xie, 2008). However, provided aging has become the major challenge for dementia development, the prosperous economies can face serious problems in dealing with the patients suffering from the disorder. Greater ratios of older people in the developed world, therefore, can prevail in number over the ratio of older people in the developing countries. To enlarge on the issue, Wehling and Groth (2011) have introduced the statistics counting, â€Å"†¦number of people aged 65 years and above will grow from 600 million to 2 billion (increase of 330 %) and the 80+ generation will increase by more than 400 % from 105 million to 400 million† (pp. 275-276). Therefore, the increase in lif e expectancy levels presupposed by the socioeconomic progress explains the ratio of older people in the developed world. However, these improvements contrast with the rapid decrease in birth rates. In case the established pace of life expectancy continues growing in the course of the 21st century, most children born in 2000 are likely to reach the age of 100 (Wehling Groth, 2011). Such statistics is worsened by the decline of the youth ratio. For instance, Japan has one of the highest rates of life longevity in the world.Advertising Looking for research paper on psychology? Let's see if we can help you! Get your first paper with 15% OFF Learn More Education as the Threshold Identifying Lifespan of Individuals with Dementia in Developing and Developed Countries According to Prince et al. (2003), â€Å"low levels of education, literacy, and numeracy can result in cognitively unimpaired people screening positive for dementia† (p. 909). In educational terms, sensitive screening techniques do not allow to define arithmetical ability, as well as the level of writing and reading skills. However, the screening instruments can be applied to various cultural circumstances. For example, it is possible to introduce interview formats that do not relate to educational realm. It should also be stressed that lack of education in developing region does not indicate the higher risk of dementia. Rather, the low indices of educational activities do not contribute to appropriate diagnosing of the disease. Therefore, the developing region should be more concerned with the development of new technological devices that can improve the situati on. With regard to the above-presented research studies, developing economies should give specific attention to education as a decisive factor in determining the quality of diagnosing, which later complicates to define advanced from of the disorder. Such a situation can also be a reason for shorter lifespan of people with dementia. In particular, the research evidence shows that Shanghai citizens defined that the mortality levels for dementia, particularly for people over the age of 75, had similar mortality indices as people suffering from cancer (Kalaria et al., 2008). In India, the average rate for survival among the patients equals to 3.3 years in developing countries, which is much lower than in developed regions where the lifespan of adult individuals with dementia reaches 9 years (Kalaria et al., 2008). In addition, high mortality rates have been identified in African region; in particular, the relative risk ratio amounts to less than 3 years. The studies by Kalaria et al. (2 008) have been defined that Asian ad Latin American regions are the leading ones in terms of the dementia prevalence. However, aging groups of population reveal lower ratio of adults with dementia in Sub-Saharan Africa and India. In this respect, it can be concluded that this region demonstrates the lowest life expectancy, which is partially predetermined by depressive illnesses and illiteracy that contribute to the development of disease. In addition, Kalaria et al. (2008) have discovered, â€Å"†¦increasing frequency of vascular disease and global tends in modernization will add to the burden of AD within the developing countries† (p. 826). Indeed, the globalization process and mobilization provide a new outlook on the treatment techniques of patients. Therefore, much concern relates to the problem of the aging population among which the ratio of adults with dementia is lower in the developing countries than in the developed ones. Introducing Costs Spent on People with Dementia in Developing and Developed Countries Understanding the importance of expenditures spent on treating dementia is vital to promote future health case, as well as improve the overall socio-economic policy. The government needs to gain evidence for establishing firm policies for the fast-growing numbers of adults with dementia. Low social awareness, underestimated attitude to the problem, and maltreatment does not contribute to the efficiency of the introduced strategies. In this respect, social protection and security are among the major challenges in the developing countries because of such factors as urban migration, conflict situations, and deployment of HIV/AIDs (Kalaria et al., 2008). The circumstances also point to the older people as the most vulnerable segment of the population living in the third world. Apart from weak social environment, the developing countries face race discrimination, which is also another reason for the decline in lifespan of people with dement ia. Moreover, the aging process of people with dementia provides greater costs and, as a result, this category is considered the economic burden, particularly for the developing world. In this respect, Wang et al. (2008) have discovered that China is among the leading countries that enters the aging era due to the high level of health care delivery. At the same time, the patients with dementia need constant care with regard to the level of disease severity (Wang et al., 2008). Therefore, despite the fact that the longevity of the patients increased, the economic burden imposed on hospitals and caregivers has been increased as well. Dias et al. (2008) support the idea of enhancing the home care support that can ensure longer life expectancy in India. In fact, the Indian region lack sufficient budgeting of the health care services, particularly people suffering from dementia and, therefore, longevity of their lives is much shorter than in other regions. Rapid demographic aging can res ult in the rise of adults suffering in dementia in the developing countries and, therefore, specific attention should be given to health care arrangement in this particular region. According to the studies by Prince (2004), older individual living in developing countries are not isolated from their younger relatives. However, significant levels of family stress create certain disadvantages in terms of lifespan of people with dementia. Moreover, in contrast to the developed countries, adults with dementia in the developing world usually live in extended families composed of three-generation households. Older people suffering from the disease cannot be regarded as a separate category in the developing societies. As a result, this group experiences significant psychological strain and increase costs influencing all family members as well. Further complications can affect education, impoverishment levels, and gender discrimination. Therefore, Prince (2004) argues, â€Å"dementia is a d evelopment issues, and as such a proper concern for proper concern for policymakers in developing countries† (p. 176). Because people in the developing countries are under the stress of family bonds, their lifespan is unlikely to be higher as compared to the lifespan of adult living in the developed world. Despite the fact that developing world has higher ratio of people with dementia among elder population, the aging phenomenon is still more typical of the developed countries. In fact, greater life expectancy in the developed economies is explained by the greater attention given to the quality of health care services. At the same time, Asian, African, and Latin American regions also witness significant rise of the aging population rates, although their services are less advanced (Shaji, 2009). As a result, because their rates of dementia disease are higher, the aging process poses a significant challenge to this region. Despite the fact that the biological phenomenon of aging is a global problem, the life of senior members of society varies greatly due to the difference in cultural and economic contexts (Shaji, 2009). Health care and aging, therefore, are predetermined by social and cultural factors, including social status and attitude to elder people as accepted in various countries (Prince, 2004). Traditional support systems are unlikely to have a potent impact on economic changes and social restructuring. Conclusion In conclusion, the research studies have discovered that the life expectancy of people with dementia in developed countries is much higher as compared to that of people with dementia in the developing countries due to a number of economic, cultural, and political factors. To begin with, the globalization can be considered as the underpinning for the highlighting the aging process in the world due to the technological and scientific progress. Due to the fact that innovation is more associated with the developed world, this region has high er level of aging population. Although the developing region, including Asia, Africa, and Latin America, has lower quality of health care services, the social support of elder generation is ensured by cultural aspects and traditions. As a result, because both face the aging process, the developing economies are under the threat of having lower rates of longevity among people with dementia. Education and economic costs also relate to the risk factors influencing the rapid growth of the patients. References Dias, A., Dewey, M. E., DSouza, J., Dhume, R., Motghare, D. D., Shaji, K. S., Patel, V. (2008). The Effectiveness of a Home Care Program for Supporting Caregivers of Persons with Dementia in Developing Countries: A Randomised Controlled Trial from Goa, India. Plos Clinical Trials, 5(6), 1-7. Kalaria, R. N., Maestre, G. E., Arizaga, R., Friedland, R. P., Galasko, D., †¦ Antuono, P. (2008). Alzheimer’s Disease and Vascular Dementia in Developing Countries: Prevalence, M anagement, and Risk Factors. Lancet Neurology, 7(9), 812-826. Prince, M. (2000). Dementia in developing countries. A consensus statement from the 10/66 Dementia Research Group. International Journal Of Geriatric Psychiatry, 15(1), 14-20. Prince, M. (2004). Care arrangements for people with dementia in developing countries. International Journal Of Geriatric Psychiatry, 19(2), 170-177. Prince, M., Acosta, D., Chiu, H., Scazufca, M., Varghese, M. (2003). Dementia Diagnosis in Developing Countries: A Cross Cultural Validation Study. The Lancet, 361, 909-917. Rooij, A., Luijkx, K. G., Declercq, A. G., Schols, J. (2011). Quality of Life of Residents with Dementia in Long-Term Care Settings in the Netherlands and Belgium: Design of a Longitudinal Comparative Study in Transitional Nursing Homes and Small-Scale Living Facilities. BMC Geriatrics. 11(20), 20. Routree, S. D., Chan, W., Pavlik, V. N. Darby, E. J., Doody, R. S. (2012). Factors that Influence Survival in a Probable Alzheimer D isease Cohort. Alzheimer’s Research Therapy, 4(16), 1-6. Shaji, K. (2009). Dementia care in developing countries: the road ahead. Indian Journal of Psychiatry, 51, 5-7. Wang, G., Cheng, Q., Zhang, S., Bai, L., Zeng, J., Cui, P., Chen, S. (2008). Economic impact of dementia in developing countries: an evaluation of Alzheimer-type dementia in Shanghai, China. Journal of Alzheimers Disease: JAD, 15(1), 109-115. Waring, S. C., Doody, R. S., Pavlik, V. N., Massman, P. J., and Chan, W. (2005). Survival among Patients with Dementia from a Large Multi-ethnic Population. Alzheimer Disease and Associated Disorders, 19(4), 178-183. Wehling, M., Groth, H. (2011). Challenges of longevity in developed countries: vascular prevention of dementia as an immediate clue to tackle an upcoming medical, social and economic stretch. Neuro-Degenerative Diseases, 8(5), 275-282. Xie, J. (2008). Survival Times in People with Dementia: Analysis from Population Based Cohort Study with 14 Year Follow-U p. British Medical Journal. 336, 258-262.

The Main Types of Chemical Bonds

The Main Types of Chemical Bonds Atoms are the basic building blocks of all types of matter. Atoms link to other atoms through chemicals bonds resulting from the strong attractive forces that exist between the atoms. A chemical bond is a region that forms when electrons from different atoms interact with each other. The electrons that participate in chemical bonds are the valence electrons, which are the electrons found in an atoms outermost shell. When two atoms approach each other these outer electrons interact. Electrons repel each other, yet they are attracted to the protons within atoms. The interplay of forces results in some atoms forming bonds with each other and sticking together. Main Types of Chemical Bonds The two main types of bonds formed between atoms are ionic bonds and covalent bonds. An ionic bond is formed when one atom accepts or donates one or more of its valence electrons to another atom. A covalent bond is formed when atoms share valence electrons. The atoms do not always share the electrons equally, so a polar covalent bond may be the result. When electrons are shared by two metallic atoms a metallic bond may be formed. In a covalent bond, electrons are shared between two atoms. The electrons that participate in metallic bonds may be shared between any of the metal atoms in the region. Predict Type of Chemical Bond Based on Electronegativity If the electronegativity values of two atoms are similar: Metallic bonds form between two metal atoms.Covalent bonds form between two non-metal atoms. Nonpolar covalent bonds form when the electronegativity values are very similar, while polar covalent bonds form when the electronegativity values are a little further apart. If the electronegativity values of two atoms are different, ionic bonds are formed.

Method Essay Example | Topics and Well Written Essays - 2000 words

Method - Essay Example The antioxidants stock solutions were prepared separately. Four hundred milligrams of L-ascorbic acid and tannic acid were dissolved in 5 mL of water to make a stock solution of 80 mg/mL. Forty milligrams of epigallocatechin were dissolved in 5 mL water for a concentration of stock solution of 8 mg/mL. Cells of Staphylococcus aureus strains SH1000 and UAMS-1 were streaked on Mueller-Hinton Agar (MHA) plates and incubated 37Â °C for 24 hours. After this period, single colonies were picked, and transferred to tubes with Mueller-Hinton Broth (MHB). The tubes were placed in an incubator-shaker at 37 Â °C for another 24 hours. The overnight cultures in MHB, after appropriate dilution, served as the inocula for the experimental determination of minimum inhibitory concentration (MIC) of antibiotics and antioxidants, and mutational frequencies (MF). Overnight cultures were always used fresh, and not after storage. The desired antibiotic starting concentrations were obtained by diluting the desired volume from the stock solutions. For the determination of the mupirocin MIC, the starting concentration was 16 Â µg/mL. This amount was diluted doubly using sterile saline to produce decreasing concentrations of 16, 8, 4, 2, 1, 0.5, 0.25, 0.125, 0.0625, and 0.03125 Â µg/mL. The starting concentration of rifampicin was 2 Â µg/mL. Again, double dilution was performed. The following concentrations were used to determine the rifampicin MIC: 2, 1, 0.5, 0.25, 0.125, 0.0625, 0.03125, 0.01563, 0.0078, and 0.0039 Â µg/mL. To determine the MICs of the antioxidants that were to be used in the experiment, the antioxidants solutions were also serially diluted similar to what was done for the antimicrobials mupirocin and rifampicin. The starting concentration of all the antioxidants was 8 mg/mL. After double dilutions, the concentrations used were 8, 4, 2, 1, 0.5, 0.25, 0.125, 0.0625, 0.03125, and 0.01563 mg/mL. Cellulose ester disks with 0.22 Â µm