strain


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Related to strain: strain gauge, Muscle strain

strain:

see strength of materialsstrength of materials,
measurement in engineering of the capacity of metal, wood, concrete, and other materials to withstand stress and strain. Stress is the internal force exerted by one part of an elastic body upon the adjoining part, and strain is the deformation or change in
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.

Strain

 

a pure culture of a species of microorganism in which its morphological and physiological characteristics are studied.

Strains can be isolated from a variety of sources, for example, soil, water, or food, or they can be isolated from a single source at different times. Hence, the same species of bacterium, yeast, or microscopic fungus may have a great many strains, differing from one another in several characteristics, such as sensitivity to antibiotics and capacity to produce toxins and enzymes. Commercial strains of microorganisms developed as a result of selection and used in industry for the microbiological synthesis of proteins (including enzymes), antibiotics, vitamins, and organic acids are much more productive than wild strains.

strain

[strān]
(biology)
An intraspecific group of organisms that possess only one or a few distinctive traits and are maintained as an artificial breeding group.
(cell and molecular biology)
A population of cells derived either from a primary culture or from a cell line by the selection or cloning of cells having specific properties or markers.
(mechanics)
Change in length of an object in some direction per unit undistorted length in some direction, not necessarily the same; the nine possible strains form a second-rank tensor.

strain

A change in the form or shape of a body or material which is subjected to an external force.

strain

Any deformation or deflection in a body caused by stress. The strain is directly proportional to the stress, as a load is applied until the proportional limit is reached. Beyond that point, the strain may increase at a changing rate until the yield stress is reached, but the part will return to its original size and shape when the load is removed and the strain is zero. The body will be deformed if the yield stress is exceeded. The strain is recorded as the change of size over the original size.

strain

1
1. Music a theme, melody, or tune
2. a feeling of tension and tiredness resulting from overwork, worry, etc.; stress
3. a particular style or recurring theme in speech or writing
4. Physics the change in dimension of a body under load expressed as the ratio of the total deflection or change in dimension to the original unloaded dimension. It may be a ratio of lengths, areas, or volumes

strain

2
1. a group of organisms within a species or variety, distinguished by one or more minor characteristics
2. a variety of bacterium or fungus, esp one used for a culture
References in periodicals archive ?
PCR amplification of ORF 62 was performed on all the clinical specimens and the vaccine strain using the PKVL6U-PKVL1L (genome position 106036-106284) set of previously-published primers [12].
Most of those genes remained inactive in animals infected with the contemporary strain, the group reports online Sept.
The contact or internal compressive stress is determined by dividing the load by initial contact area, while the strain is determined by dividing the deflection by the sample's initial height.
Slowly new strains appeared with claims that they were viable animal models of diseases like Alzheimer's and arthritis, models for longevity and aging, and models to study learning and memory.
With the reverse genetics method, scientists can splice the desired genes--six from the harmless strain and the HA and NA genes from the circulating strain (which have already been adjusted to be nonvirulent)--into small circular pieces of DNA called "plasmids.
She checks in with her son by phone every day, but when Strain evacuated New Orleans, he wasn't able to talk to his mom for a while.
Stress increased almost proportionally with strain until [gamma] [congruent to] 0.
In contrast to live attenuated vaccines, only a small portion of the genetic material will be used, therefore there is no risk that the vaccine could mutate or combine with naturally occurring influenza viruses to produce new strains, or recombine with human influenza strains which would have devastating global consequences.
Consequently, it is impossible to separate the elastic and plastic components of strain on the basis of the "elastic" modulus, as described above.
Strain broadening that cannot be written according to the model of Wilkens is not treated in the paper.
Dual-tropic strains infect all 3 types of cells and use both co-receptors as entry pathways.
The origins of the more virulent strains of Toxoplasma were first documented in a 2001 Science paper from Boothroyd's group; the researchers found that the recombination of two relatively benign strains of Toxoplasma can result in a thousand-fold increase in their ability to cause serious disease.