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Shift in Biological Definition

Antigenic shift

... Antigenic shift is the process by which two different strains of ... strain, it may be highly dangerous. Antigenic shift is contrasted with antigenic drift which is ... Influenza virus which have undergone antigenic shift have also gone on to cause the Asian Flu ...

Protein

... complex . In addition to these levels of structure, proteins may shift between several similar structures in performing their biological ... them; receptors , which do not modify their substrates but may simply shift shape upon binding them; and antibodies , which appear to do nothing more ...

Signal transduction

... domain recognizes the hormone, the whole receptor undergoes a structural shift that affects the intracellular domain, leading to further action. In this ... the cytosol with its cytoplasmic domain, which the protein does through a shift in conformation. The activated effector proteins usually stay close to the ...

Alternative splicing

... However, the intron must be properly encoding for amino acids . The intron's code must be properly expressible, otherwise a stop codon or a shift in the reading frame will cause the protein to be non-functional. Exon cassette mode : in this case, certain exons are spliced out to alter the ...

Apoptosis

... been scattered reports on the topic of cell death for more than a century, the 20,000 publications on this topic within the past 5 years reflect a shift from historically mild interest to contemporary fascination." [22] Kerr, Wyllie, and Currie who coined the term apoptosis (falling leaves in ...

Avian influenza

... H9 are known to be capable of crossing the species barrier from birds to humans. It is feared that if the avian influenza virus undergoes antigenic shift with a human influenza virus, the new subtype created could be both highly contagious and highly lethal in humans. Such a subtype could cause a ...

Barr body

... in levels of Xist around the Xic . Meanwhile, on the future active X Tsix levels are maintained; thus the levels of Xist remain low. This shift allows Xist to begin coating the future inactive chromosome, spreading out from the Xic. In non-random inactivation this choice appears to be ...

Modern evolutionary synthesis

... evolutionary synthesis continued to be developed and refined after the initial establishment in the 1930s and 1940s. The most notable paradigm shift was the so-called Williams revolution , after George C. Williams presented a gene-centric view of evolution in the 1960s. The synthesis as it ...

Nutrition

... U.S. dietary recommendations is unlikely to prevent much ... To get really significant changes in disease rates, it will be necessary to shift the American diet from its heavy reliance on animal-based foods to one that relies far more on plant-based foods" (Cornell Chronicle 10/1/94) ...

Photosystem

... a normally has an optimal absorption wavelength of 660 nanometers , it associates with different proteins in each type of photosytem to slightly shift its optimal wavelength, producing two distinct photosystem types. Other proteins serve to support the structure and electron pathways in the ...

Photosystem

... a normally has an optimal absorption wavelength of 660 nanometers , it associates with different proteins in each type of photosytem to slightly shift its optimal wavelength, producing two distinct photosystem types. Other proteins serve to support the structure and electron pathways in the ...

Primary nutritional groups

... microorganisms are not limited to just one nutritional mode. For example, there are some algae that live photolithoautotrophically in the light, but shift to chemoorganoheterotophic life in the dark, and even higher plants retained their ability to respire heterotrophically on the starch at night, which ...

Species

... compelling theory of evolution . Basically, Darwin argued that it is populations that evolve, not individuals. His argument relies on a radical shift in perspective from Linnaeus: rather than defining species in ideal terms (and searching for an ideal representative and rejecting deviations), ...

Optical spectrum

... gratings to observe spectra at very high spectral resolutions. The first exoplanets to be discovered were found by analysing the doppler shift of stars at such high resolution that variations in their radial velocity as small as a few metres per second could be detected - the presence of ...
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