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Strain in Biological Definition

Escherichia coli

... Although in most healthy adult humans such a strain would probably cause no more than a bout of ... people taking certain medications, an unfamiliar strain can cause serious illness and even death. A particularly virulent example of such a strain of E. coli is E.coli O157:H7 . Because of ...

Ebola

... , and was named Ebola–Reston . This strain seemed to be spread through the air, but did not ... outbreaks of Ebola–Zare than any other strain of Ebola virus. The first outbreak took place in ... on the United States via a newly discovered strain of Ebola that propagates by air. See also ...

Oswald Avery

... called a Pneumococcus was used. The R strain is harmless, while the S strain causes pneumonia in laboratory mice . ... organic compounds were still able to cause R strain bacteria to transform then the substances removed ...

Gene

... now known as Griffith's experiment , injections into a mouse of a deadly strain of a bacteria that had been heat-killed transferred genetic information to a safe strain of the same bacteria, killing the mouse. In 1941 , George Wells Beadle ...

Vaccine

... prevent or ameliorate the effects of infection by any natural or 'wild' strain of the organism. The term derives from vaccinia , the infectious viral ... tuberculosis vaccine is not the contagious TB strain, but a related strain called " BCG "; it is used in the United States very infrequently. A ...

Varicella zoster virus

... (ZIG), and vidarabine . A live attenuated VZV Oka/Merck strain vaccine is available and is marketed under the trade name Varivax . It was developed by Merck, Sharp & Dohme in the 1980s from the Oka strain virus isolated and attenuated by Michiaki Takahashi and colleagues in the ...

Ames test

... assay is carried out using strains of bacteria , generally Escherichia coli or Salmonella that already have a single mutation, for example, a strain that cannot produce histidine , an amino acid that is essential for the bacterium to grow if not provided externally with essential nutrients. ...

Antibiotic

... a serious problem in both the developed and underdeveloped nations. By 1984 half the people with active tuberculosis in the United States had a strain that resisted at least one antibiotic. In certain settings, such as hospitals and some child-care locations, the rate of antibiotic resistance is ...

Biomechanics

... used second order tensors include the Cauchy stress tensor, the second Piola-Kirchhoff stress tensor, the deformation gradient tensor, and the Green strain tensor. A reader of the biomechanics literature would be well-advised to note precisely the definitions of the various tensors which are being used ...

DNA

... killed "smooth" (S) form available to the live "rough" (R) form. Quite unexpectedly, the living R Pneumococcus bacteria were transformed into a new strain of the S form, and the transferred S characteristics turned out to be heritable. In 1944 , the renowned physicist, Erwin Schrdinger , ...

Hfr cell

... A hfr cell (also called hfr strain ) is a bacterium with a conjugative plasmid (often F ) integrated into its genomic DNA. Hfr is the abbreviation for high frequency ...
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