X-ray diffraction has perhaps been one of the most critical and exigent discoveries of the 20th century. Early X-ray diffraction images for tobacco mosaic virus had been collected before World War II. By 1954‚ Watson had discovered from his X-ray diffraction images that the tobacco mosaic virus had a helical structure‚ and was able to apply this to his famous DNA structure research. It is so valued because it allows the structure of a crystalline material can be determined‚ based on the diffraction
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Moore Brooke Professor Sharp Composition I 5 November 2014 Essay #3 Approximately 443‚000 people die prematurely from smoking or exposure to secondhand smoke each year. Smoking Harms nearly every organ of the body and causes many diseases and reduces the health of smokers in general. Smoking during pregnancy would be an example of the harmful risk factors‚ and not only harms the mother but also the child. Even though many people think that menthol and e-cigs are less harmful‚ they have the same
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Jenner‚ Louis Pasteur‚ Elie Metchnikoff‚ Dmitri Iwanowski‚ Paul Ehrlich‚ Alexander Fleming) II. Scope of Microbiology A. Infectious Agents 1. Prions 2. Viroids 3. Viruses B. Prokaryotes - Bacteria 1. Eubacteria 2. Archaea bacteria C. Eukaryotes 1. Algae 2. Protozoans 3. Fungi – Yeasts &
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Nutritional and environmental impact on carcinogenesis Nutritional and environmental impact on carcinogenesis Tumor: A mass of cells which growth is atypical when referenced to the normal surrounding tissue structure. Neoplasm: Literally means “new growth” and is a term commonly used the same way that the term tumor is used. An abnormal mass of tissue‚ the growth of which exceeds and is uncoordinated with that of the normal tissues and persists in the same excessive manner after
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diseases Diseases in plants are caused by bacteria‚ fungi‚ and viruses (Priyanka.L et al‚ 2016 and Conrad.C et al‚ 2014). Primarily fungi are identified from their morphology emphasising on their reproductive structures. Bacteria general have simpler life cycles and are considered more primitive than fungi. Bacteria exist as single cell with few exceptions and increase in numbers by dividing into two cells during binary fission. Viruses are quite tiny particles consisting of protein and genetic material
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“microbe”? What groups of organisms are included in this category? Microbes (microorganisms) are minute living things that individually are too small to be seen with the unaided eye the group includes bacteria‚ fungi‚ protozoa‚ and microscopic algae‚ viruses Only minority of microorganisms are pathogenic(disease-producing) 2. What are some of the benefits provided by microbes? Decompose organic waste‚ producers in the ecosystem by photosynthesis‚ produce industrial chemicals such as ethanol and
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McCarthy Watson & Crick Jacob & Monod 3. What are Koch’s postulates? Why are they important and how are they applied? 4. Describe the distinguishing features of the following‚ groups of microorganisms: algae‚ bacteria‚ fungi‚ protozoans‚ viruses‚ and microscopic stages of the multicellular parasites. 5. What are the basic differences between the four types of light microscopes (brightfield‚ darkfield‚ phase contrast and fluorescent)? What are their applications? 6. How do electron microscopes
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Pest and diseases and control measures Introduction Since man started to live on agriculture‚ he has to involve in a constant struggle to protect crops from other animal and adverse environmental conditions. In order to get a maximum crop production and profit from the cultivation farmer has to pay a special attention and bare an additional cost for crop protection even today. Crop protection has become even more important due to the introduction of high yielding crop species. Pest and diseases
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very negative connotation that is seen toured people that take marijuana. Marijuana is the third most used recreational drug in America behind Alcohol and Tobacco. Marijuana is far less dangerous than alcohol or tobacco. Around 50‚000 people die each year from alcohol poisoning. More than 400‚000 deaths each year are attributed to smoking tobacco. Marijuana is a nontoxic drug that cannot case death and or overdose on it. So there are no reported deaths for Marijuana. There are a lot of unfounded
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Oral Diseases There are several causes of oral diseases ranging from chemical burns as a result of aspirin or tobacco use to hormonal disturbances from simply going through puberty or becoming pregnant. One cause of great concern is microorganisms. From bacteria to viruses‚ there are many pathogenic microorganisms that may be found in the oral cavity. As a dental assistant‚ we should be capable of identifying an abnormal condition in the mouth and making sure to inform the dentist about it
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