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... Gram staining tests the bacterial cell wall's ability to retain crystal violet dye during solvent treatment. Iodine is added as a mordant to form the crystal violet/iodine complex in order to render the dye impossible to remove.  Ethyl-alcohol solvent acts as a decolorizer and dissolves the lipid l ...
Microbiology for Central Service
Microbiology for Central Service

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Understanding Vaccines
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... bacteria into the body, thus exposing the immune system to the pathogen. Although the pathogen is too weak to make a person sick, the body “thinks” that it is being invaded by an organism, and the immune system produces antibodies and other immune-system components to kill it. It is these immune-sys ...
Bacteria Webquest - Nutley Public Schools
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Lesson 4.8 – Exponential Growth and Decay

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... Transformation Biotechnology techniques can be used to “transform” bacteria so that they will express a gene from another organism:  Copies of the desired gene are synthesized and added to the bacterial culture ex.: gene for insulin protein  Bacteria are exposed to an electrical current or other ...
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... helps prevent the spread of many viral diseases is vaccines. A vaccine is a substance introduced into the body to stimulate the production of chemicals that destroy specific diseasecausing viruses and organisms. A viral vaccine may be made from weakened or altered viruses. Because they have been wea ...
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... After a period of isolation and other preliminaries, the animal undergoes an intensive course of active immunisation by repeated inoculations with antigen. In this way, it is brought to what is termed, a hyper-immune state, in which the blood serum is rich in antibody. Periodic bleedings from the ju ...
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Insects and Microbes

... released into the soil and establish persistent infection sites. B. cereus: B. cereus is a Saprophytic non spore forming bacteria. When insect larvae feed on this bacteria, the body relaxes, and brown spots appear on the skin, then larvae stop motion and the body is covered with brown color. After d ...
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Slide 1

... curved or spiral in shape. These bacteria are commonly found in natural waters, both fresh-water and marine. Vibrio cholerae causes cholera, a waterborne infection. Campylobacters have only been recognised as human pathogens since the late 1970's, although they have been long considered to be animal ...
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History of virology



The history of virology – the scientific study of viruses and the infections they cause – began in the closing years of the 19th century. Although Louis Pasteur and Edward Jenner developed the first vaccines to protect against viral infections, they did not know that viruses existed. The first evidence of the existence of viruses came from experiments with filters that had pores small enough to retain bacteria. In 1892, Dmitry Ivanovsky used one of these filters to show that sap from a diseased tobacco plant remained infectious to healthy tobacco plants despite having been filtered. Martinus Beijerinck called the filtered, infectious substance a ""virus"" and this discovery is considered to be the beginning of virology. By the 20th century many viruses were discovered.
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