Gut Bacteria: How Can It Affect Weight and Health? Essay examples -- ga

Enteric bacteria are major microorganisms that colonise human’s gastrointestinal tract- a long tube containing specialised sections such as the mouth, oesophagus, stomach, intestines, rectum and the anus. Gut bacteria make up approximately 95 percent of the total cells in the body, with the colon containing the densest microbial communities (Gibson, Rastall and Fuller 2008: 52). Human gastrointestinal tract consists of 100 different prokaryotic species, and with two bacterial species, firmicutes and bacteroicidetes dominating them (Brooker et al. 2011: 559). The general make up of enteric bacteria is influenced by various factors including: microbial species obtained from birth, use of antibiotics, dietary intake and genetic material. Diet plays a major role in the gut environment and, changes in dietary nutrients such as, carbohydrates, fats and proteins can have a huge impact on the composition of gut bacteria. The digestion of food in the gastrointestinal tract is vital in humans, however, humans do not code for all the enzymes required to breakdown non-digestible substances and so they rely on enteric bacteria to degrade: resistant starch, non digestible carbohydrates and mucin (Scott et al. 2013:52-69). This essay will focus on how gut bacteria can affect weight and, the mutualistic relationship between gut bacteria and the human in maintaining normal health. Gut bacteria keep humans healthy by stimulating the digestive process within the large intestines. In order for nutrients to be successfully absorbed in the colon, non-digestible carbohydrates are degraded by beneficial gut microbial. One example of an anaerobically respiring bacterium which dominates the large intestine is bacteroide thetaiotaomicron. This bacteri... ... from [29 August 2013] Willey,J., Sherwood, L., Woolverton, C. (2011) Prescott’s Microbiology. New York:McGraw-Hill, 729 http://www.sciencedirect.com/science/article/pii/S1043661812002083). Willey,J., Sherwood, L., Woolverton, C. (2011) Prescott’s Microbiology. New York:McGraw-Hill, 729 Cani, P., Possemiers, S., Wiele, T., Guiot, Y., Everard, A., Rottier, O., Geurts, L., Naslain, D., Neyrinck, A., Lambert, D., Muccioli, G., Delzenne, N. (2009) ‘Changes in gut microbiota control inflammation in obese mice through a mechanism involving GLP-2-driven improvement of gut permeability’ NCBI [online] 58 (8), 1091–1103. Available from [11 november 2011] Willey,J., Sherwood, L., Woolverton, C. (2011) Prescott’s Microbiology. New York:McGraw-Hill, 756

Bios 101 Demography Lab Report

Melissa Morales Bios 101 Spring 2013 Demography- Human Life History Introduction Demography is the study of human populations. It studies the size, composition and distribution of a population, and the process through which a population changes. Demography allows us to track changes over time and to depict how different periods in history change population dynamics. Births, deaths, migration and emigration, jointly produced the change within a population (Biological Science). Demography is also a central component of social contexts and social change.Patterns of survival vary depending upon the environment. Age is also an important component for many populations because fecundity and survivorship frequently vary with age. Humans are one species whose fecundity and survivorship are affected by age and the environment. One way that biologists attempt to distinguish patterns in survivorship rates is to use a life tables. Life tables permit them to keep track of how long different parts of the population have lived. A life table can also be used to predict the probability of the survival of an individual at any given time interval (Biological Science).A cemetery is an excellent place to study human demography. Gravestones are marked with the date of birth and date of death of a deceased person. From this information one can calculate death rates and draw survivorship curves for the â€Å"population†. A survivorship curve is a graphical representation of the chance that an individual will survive from birth to any age (Biological Science). By comparing and contrasting survivorship curves for different time periods, one may look for historical trends in demography over a period of time. MethodsIn this investigation, data was collected from a local cemetery. Information was recorded information from 50 headstones, where the individual was born between 1870 and 1930. The dates of birth and dates of death were recorded for each headstone. The headstones were rand omly chosen from any area in the cemetery. Then the age at death was calculated for each of the 50 individuals. The data was then used to create a survivorship curve. Results Part 1: Fecundity Part 2: Mortality x| D(x)| S(x)| l(x)| 0| 0| 50| 1. 0| 1| 5| 45| 0. 9| 2| 3| 42| 0. 84| 3| 7| 35| 0. 7| 4| 5| 30| 0. 6| | 4| 26| 0. 52| 6| 11| 15| 0. 3| 7| 7| 8| 0. 16| 8| 7| 1| 0. 02| 9| 1| 0| 0| x= age intervals of 10 years (1-10, 11-21†¦etc. ending at age 98) D(x)= number of individuals dying at that age S(x)= number of individuals alive during that interval Discussion A survivorship graph shows, which age categories, are most likely to die, in that environment. The overall shape provides a clue about life history strategy (Type I, II, or III). This data was collected from a subset of human population and may have particular biases depending upon social class, religious traditions, and economic factors.We assumed that all the individuals had similar living situations. According to the data, more individuals died between the ages of 55-65. Based on the demographic data from this lab, multiple conclusions may be drawn. Living conditions were probably far worse in the past. This causes death and birth rates to go down because of disease. Which causes the population size to decrease. There might have also been diseases affecting older people, which could explain why that range of ages had the most individuals dying at that age.

Crash Essay - 1223 Words

Crash Stereotypes are the organizational factors that virtually shape the way we think in 20th century America. They somehow manage to categorize some of lifes most complex matters into nice distinct sections. Classifications and organization, at first glance seem to be useful in distinguishing various aspects of modern life. However, these grouping methods can be very inaccurate, leaving erroneous ideas in the minds of citizens on a global level. Stereotypes, though originating as convenient sorting mechanisms, instead, influence our thinking process. Crash depicts numerous characters and brings them together through carjacking, car accidents and shootings. The movie Crash represents the nature of race relations in America. Most of†¦show more content†¦Daniel is a hard working locksmith and devoted father who finds out that his looks dont guide a lot of his customers to trust him. And then you have Farhad, a Middle Eastern storekeeper who is continually endangered because of the Sept 11 attacks. We then think that all the people that belong to that group act the same (Haggis). The main disagreement and conflict in this movie is not between the films characters but between the films content and its structure. Race is a key in this film, and all our beliefs about who people are get twisted and turned though the complicated plot. With each new extra character we find another stereotype, and watch as that prejudice is destroyed as the character builds up. In this film every race is judged based on some general stereotype. The Asians are poor immigrants who are not important, the Mexicans are thieves, the Middle Eastern are terrorists, the white people are certainly racists, and the blacks are the gang bangers, and so on. There is not a single character in the film that is not stereotyped based on his/her country of origin or the color of their skin. Ludicrous, the angry black man who feels all white people were out to get him, justified holding gun to white peoples heads and sealing cars because he feels they owe him something. The wealthy white woman also hel d at gunpoint by LudicrousShow MoreRelatedThe Movie Crash Essay1031 Words   |  5 PagesWriter-director Paul Haggis Movie â€Å"Crash† written in 2004, tells an interconnecting story of what Whites, Blacks, Latinos, Iranians, cops and criminals. Regardless of their Social Economic Academic or Political background, they are all defined in one way or another by racism. Crash represents the modern condition as a violent bumper car ride (Variety) which connects stories based on coincidences serendipity, and luck as the lives of the characters crash against one another. 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