Careers in the EPA Research Proposal Example | Topics and Well Written Essays - 250 words

Careers in the EPA - Research Proposal Example the environmental impacts of pollutive industries led to a widespread call for sustainable development which takes into account the environmental and social aspects of economic development; an offshoot is the requirement of environmental impact assessments for development projects deemed to cause substantial ecological impacts. Large dams were subjected to review particularly as dams inadvertently alter a stream’s morphology, and subsequently the surrounding landscape as well as its biota, which several studies contend. Large dams inundate a large area and the environmental repercussions redound to adjacent ecosystems. An analysis of the environmental effects of dams as obtained by scientific studies is the objective of this report. Specifically, this paper proposes to assess the available research base on the environmental impacts of dams; the methods applied to obtain data on environmental effects; and the implications of the revealed impacts on dam development and management in the context of sustainable development. Data sources will include the review of selected publications on the positive and negative effects of dams on the geophysical environment and on the affected biota, and analyses of impact assessment studies. This evaluation and studies of the same nature are significant, urgent, and timely because it is only recently that the full impacts of dams have been felt due to the compounding nature of such effects. Looking at this effects from various perspectives is also relevant because there are varied scopes a dam alters the environment – global, regional, and local. Especially where local impacts are considered, one dam’s effect does not necessarily mean the same effect on another owing to the differences in their biologic and geographic components. Burke, M., Jorde, K., & Buffington, J.M. (2009). Application of a hierarchal framework for assessing environmental impacts of dam operation: Changes in streamflow, bed mobility, and

Case study histology 2 Example | Topics and Well Written Essays - 1000 words

Histology 2 - Case Study Example The colon is also masculine to aid in movement of food through the esophagus. The muscles contract and relax rhythmically to facilitate peristalsis. The colon is also long this ensures nutrients remain in the colon for long period to maximize absorption. The reddish appearance of the colon indicates presence of blood capillaries. Capillaries bring in oxygen for oxidation and takes away absorbed food. (Odze & Goldblum 2009, p. 10) It has a pouch like projection called cecum that collects undigested food from the ileum. It is the first section of the large intestine. Cecum has a valve that separates it from the ileum. The valve regulates the amount of food getting into the cecum and prevents backflow of food into the ileum. The main function of the cecum is to absorb water and salts. The epithelium of the colon is thin. It enables food to diffuse through the colon at a higher rate. The colon also has gland that resembles test tubes on their walls called crypts of Lieberkà ¼hn. The crypts are embedded in the epithelial lining to enable them secrete enzymes which in turn secrete mucous to lubricate the colon. In addition to this, crypts secrete hydrochloric Acid which kills any bacteria in the nutrients (Odze & Goldblum 2009, p. 66). The colon has a lining called mucosa. Mucosa secretes mucus which lubricates the colon to aid in peristalsis. The epithelium lining of the colon also has various goblet cells which secrete mucus. The mucus is used neutralize acid in the stomach. In addition to this, the mucus hinders enzymes from digesting the internal walls of the colon (Wolff 2010, p. 33) Crohns disease is a type of inflammatory bowel disease. It mostly affects the intestine though it can affect any part from the mouth to anus. It is associated with the fistulae and ulcers. Crohns disease compels the immune system to attack healthy cells within gastrointestinal tract leading to inflammation. It is usually classified as