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Event in Biological Definition

Extinction

... of a human-caused mass extinction, known as the Holocene extinction event . In that survey, the same proportion of respondents agreed with the ... an extinction through their own actions, or allow a natural extinction event to occur through negligence. Human attitudes on extinction ...

Gene duplication

... copies of its genome. The two genes that exists after a gene duplication event are paralogs. Paralogs usually code for proteins with different function ... is orthologous. If they are paralogs and resulted from a gene duplication event their function is probably too different. ...

Recombination

... Recombination usually denotes a genetic event that occurs during the formation of sperm and egg cells (especially ... during charging are recombined to form water. In cosmology , the event during which electrons became bound to nuclei . After recombination, ...

Apoptosis

... enzyme plays a crucial role in maintaining genomic integrity, and massive activation of PARP-1 can deplete the cell of energy-providing molecules, an event that sends signals from the nucleus for the mitochondrion to start the apoptotic process. Homeostasis In the adult organism, the number of ...

Bone

... . Bone matrix Bones consist of living animal cells embedded in a calcium carbonate matrix that makes up the main bone material. In the event of a broken bone, the cells are brought out of semi- stasis to repair the matrix. Matrix comprises the other major constituent of bone. It has ...

Chloroplast

... that are still present show clear similarities. It is interesting to note that in some algae, chloroplasts seem to have arisen through a secondary event of endosymbiosis, where an eukaryotic cell joined with a second eukaryotic cell containing chloroplasts, forming chloroplasts with four membrane ...

Depolarization

... In biology, depolarization refers to the event a cell undergoes when its membrane potential grows more positive with respect to the extracellular solution. Depolarization typically results ...

Escherichia coli

... predispose to infection but other factors are also important ( pregnancy in women, prostate enlargement in men) and in many cases the initiating event is unclear. When the bacteria get out of the intestinal tract through a perforation (= a hole or tear, which could be caused by an ulcer , for ...

Evolution

... gene pools ). The moment of extinction is generally considered to be the death of the last individual of that species. Extinction is not an unusual event in geological time — species are created by speciation, and disappear through extinction. Evolutionary biology Evolutionary biology ...

Genetic fingerprinting

... of growth, is giving concern to civil liberties groups in the UK, where police have wide-ranging powers to take samples and retain them even in the event of acquittal. Contents showTocToggle("show","hide") 1 DNA fingerprinting process 2 Considerations when evaluating DNA evidence ...

Genetic recombination

... influenced by the proximity of one gene to another. If two genes are located close together on a chromosome, the likelihood that a recombination event will separate these two genes is less than if they were farther apart. Genetic linkage describes the tendency of genes to be inherited together as ...

Neutral theory of molecular evolution

... allele arises typically through the spontaneous mutation of a single nucleotide within the sequence of a gene. In single-celled organisms, such an event immediately contributes a new allele to the population, and this allele is subject to drift. In sexually reproducing , multicellular organisms, the ...

Punctuated equilibrium

... it evolved. In the peripheral region itself, we might find direct evidence of speciation, but such good fortune would be rare indeed because the event occurs so rapidly in such a small population." An unstated supposition is that, through competition, the descendant species eliminates the ...

Signal transduction

... hydrophobic ). Intracellular Often, but not always, the intracellular events triggered by the external signal are considered distinct from the event of "transduction" itself, which in the strictest sense refers only to the step that converts the extracellular signal to an intra cellular one. ...

Stem cell

... 2005 that detailed information about a new stem-cell line which was derived from human embryos under completely cell and serum free conditions. This event is significant because exposure of existing human embryonic stem-cell lines to live animal cells and serum risks contamination with pathogens that ...
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(Date:8/21/2014)... landmark study aimed at improving the food intake, health ... care homes is among three projects at the University ... from the Canadian Institutes of Health Research (CIHR). ... Health Sciences at Waterloo, and a Schlegel research chair ... years to investigate why many Canadians living in long-term ...
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Breaking Biology News(10 mins):Grants will fund landmark aging research at Waterloo 2American Society of Human Genetics 2014 Annual Meeting 2Researchers develop models to study polyelectrolytes, including DNA and RNA 2
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(Date:8/22/2014)... provides insight on how the brain processes external input ... and sides of the body, in order to select ... in the journal Neuron , show that the ... of sensory information, with specialised functional roles for the ... input structure in the basal ganglia, and is typically ...
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