strain

Physics

(noun)

The amount by which a material deforms under stress or force, given as a ratio of the deformation to the initial dimension of the material and typically symbolized by ϵ\epsilonϵ is termed the engineering strain. The true strain is defined as the natural logarithm of the ratio of the final dimension to the initial dimension.

Related Terms

  • elastic
  • stress

(noun)

The amount by which a material deforms under stress or force, given as a ratio of the deformation to the initial dimension of the material and typically symbolized by ε is termed the engineering strain. The true strain is defined as the natural logarithm of the ratio of the final dimension to the initial dimension.

Related Terms

  • elastic
  • stress
Physiology

(noun)

An injury to a muscle or tendon in which the muscle fibers tear as a result of overstretching.

Related Terms

  • inguinal
  • sprain
  • groin

Examples of strain in the following topics:

  • Sprain and Strain

    • A strain is an injury to a muscle or tendon in which the muscle fibers tear as a result of overstretching.
    • A strain is also colloquially known as a pulled muscle.
    • Typical symptoms of a strain include: localized pain, stiffness, discoloration, and bruising around the strained muscle.
    • Strains can happen while doing everyday tasks and are not restricted to athletes.
    • Compression: Wrap the strained area to reduce swelling with an ACE soft-wrapped bandage.
  • Complementation

    • Complementation refers to a relationship between two different strains of an organism which both have homozygous recessive mutations.
    • These strains are true breeding for their mutation.
    • When this occurs, each strain's haploid supplies a wild-type allele to "complement" the mutated allele of the other strain's haploid, causing the offspring to have heterozygous mutations in all related genes.
    • When strains are bred together, offspring inherit wildtype versions of each gene from either parent.
    • Flies from Strain 1 have complementary mutations to flies from Strain 2 because when they are crossed the offspring are able to complete the full metabolic pathway and thus have red eyes.
  • Stress and Strain

    • The ratio of force to area FA\frac{F}{A}​A​​F​​ is called stress and the ratio of change in length to length ΔLL\frac{\Delta L}{L}​L​​ΔL​​ is called the strain.
    • The ratio of force to area FA\frac{F}{A}​A​​F​​ is called stress and the ratio of change in length to length ΔLL\frac{\Delta L}{L}​L​​ΔL​​ is called the strain.
    • Stress and strain are related to each other by a constant called Young's Modulus or the elastic modulus which varies depending on the material.
    • Using Young's Modulus the relation between stress and strain is given by: $\text{stress} = Y\cdot\text{strain}$.
  • Antibiotic Misuse

    • Antibiotic misuse is one factor responsible for the emergence of antimicrobial resistant bacterial strains.
    • Developing new antibiotics and other treatments to keep pace with antibiotic-resistant strains of bacteria is necessary.
    • However, using antibiotics wisely is equally important for preventing the spread of resistant strains.
    • Antibiotic misuse has contributed largely to the emergence of new resistant strains.
    • Misusing them leads to resistant bacterial strains.
  • Strain Theory: How Social Values Produce Deviance

    • Strain theory states that social structures within society may pressure citizens to commit crimes.
    • Social strain theory was developed by famed American sociologist Robert K.
    • Strain may be structural, which refers to the processes at the societal level that filter down and affect how the individual perceives his or her needs.
    • These types of strain can insinuate social structures within society that then pressure citizens to become criminals.
    • In this sense, according social strain theory, social values actually produce deviance in two ways.
  • Combustion

    • In small-ring cyclic compounds ring strain can be a major contributor to thermodynamic stability and chemical reactivity.
    • The chief source of ring strain in smaller rings is angle strain and eclipsing strain.
    • As noted elsewhere, cyclopropane and cyclobutane have large contributions of both strains, with angle strain being especially severe.
    • Changes in chemical reactivity as a consequence of angle strain are dramatic in the case of cyclopropane, and are also evident for cyclobutane.
  • Pulled Hamstring and Charley Horse

    • A strained hamstring, also known as a pulled hamstring, is defined as an excessive stretch or tear of muscle fibers and related tissue.
    • Grade 3 - Bruising due to strained hamstring, horizontal lines show where bandage was.
    • A grade three hamstring strain is a severe injury.
    • Lower grade strains can easily become worse if the hamstring is not rested properly.
    • Initial treatment of the injury, regardless of the severity of the strain, is the same.
  • Statistical Literacy

    • The levels of troponin in subjects with and without signs of right ventricular strain in the electrocardiogram were compared in the experiment described here: http://www.bmj.com/content/326/7384/312.
    • The troponin concentration in patients with signs of right ventricular strain was higher (median = 0.03 ng/ml) than in patients without right ventricular strain (median < 0.01 ng/ml), p<0.001.
  • Elasticity, Stress, and Strain

    • Elasticity is a measure of how much an object deforms (strain) when a given stress (force) is applied.
    • Strain is the change in length divided by the original length of the object.
  • Ascomycota: The Sac Fungi

    • Sexual reproduction starts with the development of special hyphae from either one of two types of mating strains .
    • The "male" strain produces an antheridium (plural: antheridia) and the "female" strain develops an ascogonium (plural: ascogonia).
    • Special ascogenous hyphae arise, in which pairs of nuclei migrate: one from the "male" strain and one from the "female" strain.
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