Plant Pigment Chromatography Essay Example for Free

Plant Pigment Chromatography Essay 1. Describe what each of your chromatography strips looked like. Specifically, identify the pigments on each strip and compare their positions to one another. Plants have four types of pigments, namely chlorophyll, carotenoids, anthocyanins, and xanthophylls. These pigments have different polarities and chemical properties. In paper chromatography, the pigments will separate based on their affinity to the medium (paper), and affinity for the solvent. The solvents used in this experiment are water (polar) and acetone (mid-polar). Therefore, the different pigments will migrate based on their respective polarities too. The pattern of migration will be similar for acetone and distilled water. The fastest to migrate (or found at the topmost of the paper strip) will be anthocyanin, followed by carotenoids, then xanthophylls and lastly chlorophyll. Chlorophyll is insoluble in polar solvents therefore it will migrate slowest in both water and acetone and will be found closest to the bottom of the paper strip. 2. Which pigments did the spinach and the red leaf lettuce have in common? Propose an explanation for this. Spinach and red lettuce will have the same pigments, only they will be in different concentrations. Plants have different pigments to maximize their photosynthesizing capability. With different pigments, all the photosynthetically active radiation emitted by the different light wavelengths will be absorbed. For example, the green pigment chlorophyll will not absorb the green wavelength; therefore, the carotenoids and the xanthophylls will absorb light in that region to increase absorption rate. 3. Which pigments were soluble in water? In acetone? Why are some pigments carried further from their original position than others? Chlorophyll is not soluble in water and only slightly soluble in acetone. Carotenes and anthocyanins are highly soluble in water. Some pigments travel further away from their original position compared to others because these specific pigments are more soluble in water or acetone than the others are. The differences in solubility are attributed to their different chemical structures and composition. 4. In the fall, leaves often change colours as the day shortens. Propose an explanation for this colour change. What do you think happens to the green pigments? Why dont we see the other pigments during the summer? In some trees, changes in leaf colour occur in autumn. Changes in day and night temperatures, daylength and light intensity will signal that autumn is about to set in. In autumn, the production of food, through the process of photosynthesis, is minimized to conserve energy and resources. With this, the plant will stop manufacturing chlorophyll, the photosynthetic pigment responsible for the green colour in plants. Without any chlorophyll, the other pigments that are present in the leaf, like anthocyanin and carotene, become exposed. These pigments do not absorb red and yellow in the light spectrum, therefore leaves with high carotenes show yellow, red, and orange colours. 5. Which pigments are most crucial to plant survival? Outline the functions of these pigments. Chlorophyll a and b are the pigments that are most crucial to the survival of the plants. These two pigments are present in the highest amount in the leaves compared to other pigments. The pigments absorb light and transmit the energy from this light to other chlorophyll molecules towards the photochemical reaction centre in the dark reaction phase of photosynthesis (Mathews Van Holde, 1996). Chlorophyll therefore plays a very important role in photosynthesis. Conclusion Plants have a large number of pigments to carry out photosynthesis to ensure that the absorption of photosynthetically active radiation (PAR) is maximized. Individually, the different pigments will absorb only a certain range of wavelengths in the PAR. For example, chlorophyll will not absorb the blue green region while carotenoids will try to absorb energy in the green region of the light spectra. References Mathews, C. K. , Van Holde, K. (1996). Biochemistry (Second ed. ). Menlo Park: The Benjamin Cummings Publishing Company, Inc. ,.

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Cities Reveal the Best and the Worst Poor and Poverty To be poor, in the economic sense, one merely has to have a sufficiently low income relative to the national average. In this study the standard below which one is regarded as poor is defined as an annual income less than one half of the national [gross domestic product - GDP] per head. On this basis it is evident that to be poor is the norm in most developing countries. This fact is critical if we are to target development to benefit the poor. If one further defines the poor as those who belong to households with an annual income of half the national GDP per capita or less, we define as poor between one half and three quarters of the households of developing countries. Less developed countries; the traditional measures of poverty often based on absolute and one-dimensional approaches and referring strictly to monetary variables, seem to represent a good way to describe the phenomenon. Wealth Wealth is conventionally defined in terms of possessions and market value. One definition of wealth is: "Wealth which combines energy and intellect can only increase, and that wealth can increase only with use and that wealth increases as fast as it is used." By Anonymous The World’s Best and Worst Cities There are various reasons, which can make city best and worst for living. One of the prime factor is the economical conditions of the country as well as the in the region. The best condition of humanity includes, the sanitary system, transportation facilities, pollution level, rate of crime, facilities provided to the citizens of the city/country, environmental factor, population growth, country’s GDP, health and safety conditions, and literacy rate are the essential meters to gauge an... ...nd also Bern all sharing the second place. Milan, Athens and Rome were described as the least safe cities in Western Europe, while Washington received the worst safety ranking in the United States. Abidjan in Ivory Coast was the world's second most dangerous city at the end of last year, when the survey was taken. Several other African cities were also at the very bottom of the table. Those cities posses the best human conditions can also be consider as the richest and developed, and those which are worst, can be considered as the poor cities/countries. It is basically the game of wealth and poverty. The major population of the world has lack of food, health, wealth, water, education, and other necessities of life, which make their life so miserable and worst. References http://news.bbc.co.uk/2/hi/africa/2815105.stm http://news.bbc.co.uk/2/hi/europe/2815625.stm

Health tourism,a boon or a curse Essay

Health Tourism (Also known as Medical tourism) refers to the act of traveling to a foreign country in order to receive medical care. Varying reports based on the US alone put the number of American patients seeking healthcare abroad between 500,000 to 750,000 in 2007. This is a steady increase from 2006 in which medical experts believed as many as 200,000 to 1/2 a million Americans traveled out of the country for medical procedures. These figures indicate a significant growth in the industry, currently a $20 billion market, which can reach $100 billion by 2012. Governments in places such as India and Malaysia (as well as some others) are already getting involved and investing in this growing industry. The main reasons that people travel to receive medical treatment are: Certain medical services are not available in their country of residence. Their health insurance does not cover the full cost of a procedure. Wait lines are too long. Quality of care is better in a different country. Costs are lower in a different country. (even when factoring in the travel arrangements) Medical tourism is a growing sector in India. India’s medical tourism sector is expected to experience an annual growth rate of 30%, making it a $2 billion industry by 2015.[1][2] As medical treatment costs in the developed world balloon – with the United States leading the way – more and more Westerners are finding the prospect of international travel for medical care increasingly appealing. An estimated 150,000 of these travel to India for low-priced healthcare procedures every year.[3] Advantages for medical treatment in India include reduced costs, the availability of latest medical technologies,[4] and a growing compliance on international quality standards, as well as the fact that foreigners are less likely to face a language barrier in India. The Indian government is taking steps to address infrastructure issues that hinder the country’s growth in medical tourism. The government has removed visa restrictions on tourist visas that required a two-month gap between consecutive visits for people from Gulf countries which is likely to boost medical tourism.[5] A visa-on-arrival scheme for tourists from select countries has been instituted which allows foreign nationals to stay in India for 30 days for medical reasons.[6] In Noida, which is fast emerging as a hotspot for medical tourism, a number of hospitals have hired language translators to make patients from Balkan and African countries feel more comfortable while at the same time helping in the facilitation of their  treatment.[7] Confederation of Indian Industry reported that 150,000 medical tourists came to India in 2005, based on feedback from the organization’s member hospitals. The number grew to 200,000 by 2008. A separate study by ASSOCHAM reported that the year 2011 saw 850,000 medical tourists in India and projected that by 2015 this number would rise to 3,200,000.[8] Most estimates claim treatment costs in India start at around a tenth of the price of comparable treatment in America or Britain.[9][10] The most popular treatments sought in India by medical tourists are alternative medicine, bone-marrow transplant, cardiac bypass, eye surgery and hip replacement,dental treatment. India is known in particular for heart surgery, hip resurfacing and for dental treatments at cheap prices. Lower treatment cost does not necessarily mean lower healthcare standards. There are 18 JCI accredited hospitals in India.[11] However, for a patient traveling to India, it is important to find the optimal Doctor-Hospital combination. After the patient has been treated, the patient has the option of either recuperating in the hospital or at a paid accommodation nearby. Many hospitals also give the option of continuing the treatment through telemedicine. The city of Chennai has been termed India’s health capital. Multi- and super-specialty hospitals across the city bring in an estimated 150 international patients every day. Chennai attracts about 45 percent of health tourists from abroad arriving in the country and 30 to 40 percent of domestic health tourists. Factors behind the tourists inflow in the city include low costs, little to no waiting period, and facilities offered at the specialty hospitals in the city. The city has an estimated 12,500 hospital beds, of which only half is used by the city’s population with the rest being shared by patients from other states of the country and foreigners. Dental clinics have attracted dental care tourism to Chennai[17] India’s annual earnings through Medical Tourism is all set to double to 8000 Crore Rupees [2000 million US dollars] by year 2012 according to a recent study. The main reasons the study claims why medical tourism would flourish in India include much more lower medical costs for various surgical procedures such as bone narrow transparent, coronary bye-pass surgery, knee transplant and liver transplant as compared to western countries and even many of the Asian countries. Very good medical infrastructure not only in large Metros but also in tertiary  towns is another reason for medical tourists favouring India.Availability of highly qualified medical professionals and nurses gives them the confidence to do such major procedures here. The disadvantages are: It make health sector highly commercial and the common man in the country will be hard pressed for medical care; 2) All the resources of health sector will be thrown open for the international tourist so much so that even the so called middle class will be able to ill afford the medical care. 3) Patients from overseas, if they come in droves, may bring in new types of diseases and the risks of infection. 4) In the name of medical tourism, many people who want to enjoy themselves in this country, with the ostensible intention for treatment in this country, may turn the hospitals into merry making resorts and convert the hotels into hospitals.Tourism has its own benefits as well as demerits.

Public Sociology And Its Normative Commitment - 1169 Words

4.1. Public sociology and its normative commitment Concerning Burawoy’s appeal for sociologists to be involved in social change and improvement, Hanemaayer Schneider (2014) asked how and under what circumstances should or should not sociologists advocate for social change? And how do we know what is best for humanity? Noteworthy of Durkheim’s concerns of public sociology is the caution of the discipline being value-ladden in terms of its normative commitments on social issues (Hanemaayer, 2014). In its ambition to recommend what is best for humanity, the discipline can become guilty of becoming an ideological science; where the discipline becoming overdetermined to provide solutions through moralization which causes it to erroneously use its value-oriented notions to govern the collation of facts. The danger of this approach is that the concept, i.e. what is good or right in the interest of humanity, normatively determines the organization of facts as the concept reproduces itself upon the facts (aprior organization of facts) (Hanemaayer, 2014). Thus, research no longer becomes a tool for objective and critical analysis but a way to legitimate the values the sociologist wants to see. Title (2004) also argues that every social issue inherently involves moral dilemmas as what is or is not can be ambiguous. 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