distance

Wavelength

The wavelength is the distance between repeating units of a wave pattern. It is...lambda;). In a sine wave, the wavelength is the distance between peaks: The x axis represents distance, and I would be some varying quantity (for i...

Trait

...e point along this string is the centromere ; the distance from a gene to the centromere is referred to as the gene's locus or map location. A chromosomal region known to control a trait while the responsible gene within not being identified is referred to as a quantitative trait locus . The nucleus of ...

Species

... the hybrid zone relative to the typical dispersal distance of the organisms in question. The dispersal distance of oaks , for example, is the distance that a bird or squirrel can be expected to carry an acorn;...

Signal transduction

...ences are quite similar, but their orientation and distance are the parameters by which the DNA-binding domains of the receptors can tell them apart. Steroid receptors Steroid receptors are a subclass of nuclear receptors, located primarily within the cytosol. In the absence of steroid hormone, the...

Restriction fragment length polymorphism

...be enhanced by Southern blotting . Result The distance between the locations cut by restriction enzymes (the restriction sites ) varies between individuals: so the length of the fragments varies, and the position of certain gel bands differs between individuals (thus polymorphism ). This can be use...

Potential energy

...al constant . If h is instead taken to be the distance from the center of the sphere, then outside the sp...l energy. Relative to this, an object at a finite distance r from a source of gravitation has negative potential energy. If the source is approximated as a ...

Photon

...metres per second (the metre is defined as the distance travelled by light in a vacuum in 1/299,792,458 of a second , so the speed of light does not suffer any experimental uncertainty, unlike the metre or the second), or approximately 3×10 8 m s −1 . The dispersion relation of photons ...

Polymerase chain reaction

...he two primers is common, and would anneal a short distance away from the mutation, while the other anneals right on the variation. The 3' end of the allele-specific primer is modified, to only anneal if it matches one of the alleles. If the mutation of interest is a T or C single nucleotide polymorphism (T...

Magnetic resonance imaging

...to distinguish two structures an arbitrarily small distance from each other as separate), MRI provides far better contrast resolution (the ability to distinguish the differences between two arbitrarily similar but not identical tissues). The basis of this ability is the complex library of pulse sequences ...

Microscope

...facture or inspection, and the like. Great working distance and depth of field here are important qualities for this type of microscope. Both qualities are inversely correlated with resolution: the higher the resolution (i.e., magnification), the smaller the depth of field and working distance. A stereo micro...

Actin

...eparates each filament by 40 nm . This increase in distance allows the motor protein myosin to interact with the filament, enabling deformation or contraction. In the first case, one end of myosin is bound to the plasma membrane while the other end walks towards the plus end of the actin filament. This...

Gel electrophoresis

... mixture(s) in order to determine their size. The distance a band travels is approximately inversely proportional to the log 10 of the size of the molecule. Types Gel electrophoresis is used in genetics and biochemistry : Gel electrophoresis of large DNA or RNA is usually done by agarose gel e...

Fick's law of diffusion

..., P 2 - P 1 Inversely proportional to the distance over which diffusion must take place, or in other words the thickness of the membrane, D . Fick's first law is also important in radiation transfer equations. However, in this context it becomes inaccurate when the diffusion constant is low and...

Eye

.... The amount of refraction required depends on the distance of the object which is being viewed. A distant object will require less bending of light than a nearer one. Most of the refraction occurs at the cornea which has a fixed curvature. The remainder of the required refraction occurs at the lens. The le...

Bacterium

... mammals or insects . For instance, the genetic distance between E. coli and Thermus aquaticus is greater than the distance between humans and oak trees. See also Bacterial growth Bacteriocin Microorganism Na...

Gel electrophoresis

... mixture(s) in order to determine their size. The distance a band travels is approximately inversely proportional to the log 10 of the size of the molecule. Types Gel electrophoresis is used in genetics and biochemistry : Gel electrophoresis of large DNA or RNA is usually done by agarose gel e...

DNA

...es, which also had the effect of ensuring that the distance between the phosphate chains did not vary along a ...e. Watson and Crick were able to discern that this distance was constant and to measure its exact value of 2 nanometres from an X-ray pattern obtained by Frankl...

Bacterium

... mammals or insects . For instance, the genetic distance between E. coli and Thermus aquaticus is greater than the distance between humans and oak trees. See also Bacterial growth Bacteriocin Microorganism Na...

Actin

...eparates each filament by 40 nm . This increase in distance allows the motor protein myosin to interact with the filament, enabling deformation or contraction. In the first case, one end of myosin is bound to the plasma membrane while the other end walks towards the plus end of the actin filament. This...