Virus Purification and Assays

Virus Purification and Assays

Virus Purification and Assays Virologists must be able to purify viruses and accurately determine their concentrations in order to study virus structure, reproduction, and other aspects of their biology. These methods are so important that the growth of virology as a modern discipline depended on their development. Virus Purification Purification makes use of several virus …

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Plant biotechnology The promise and the objections

Plant biotechnology : The promise and the objections

Plant biotechnology : The promise and the objections Plant biotechnology can be defined as the use of tissue culture and genetic engineering techniques to produce genetically modified plants that exhibit new or improved desirable characteristics. The desirable characteristics include, among others, better yields, better quality, and greater resistance to adverse factors, including diseases, pests, and …

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food saftey

Food safety

Food safety In recent years, food safety has been threatened by a number of events and developments that allow food borne microorganisms pathogenic to humans, e.g., the bacteria Salmonella, Listeria, Escherichia coli strain, the protozoa Cyclospora, Cryptosporidium, and Giardia, and the hepatiti, A virus, to reach and contaminate our food in a variety of ways. …

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Mitosis and Meiosis

Mitosis and Meiosis When a eucaryotic microorganism reproduces asexually, its genetic material must be duplicated and then separated so that each new nucleus possesses a complete set of chromosomes. This process of nuclear division and chromosome distribution in eucaryotic cells is called mitosis. Mitosis actually occupies only a small portion of a microorganism’s life as …

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(A) Anton deBary. (B) Louis Pasteur. (C) Robert Koch.

Koch’s postulates

Koch’s postulates Robert Koch (1843–1910) was a medical doctor and a bacteriologist. He was the first to show, in 1876, that anthrax, a disease of sheep and other animals, including humans, was caused by a bacterium that he called Bacillus anthracis. He subsequently discovered, in 1882, that tuberculosis and, in 1883, that cholera are each …

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