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Involution is the shrinking or return of an organ to a former size. At a cellular level, involution is characterized by the process of proteolysis of the basement membrane (basal lamina), leading to epithelial regression and apoptosis, with accompanying stromal fibrosis. The consequent reduction in cell number and reorganization of stromal ...
The extinction event may have been more severe for the larger-bodied species, leaving only species of smaller-bodied animals behind. [1] As such, organisms in the smaller species which then make up the recovering ecosystem, will take time to evolve larger bodies to replace the extinct species and re-occupy the vacant ecological niche for a large-bodied animal. [1]
In developmental biology, pattern formation refers to the generation of complex organizations of cell fates in space and time. The role of genes in pattern formation is an aspect of morphogenesis , the creation of diverse anatomies from similar genes, now being explored in the science of evolutionary developmental biology or evo-devo.
In molecular biology, treadmilling is a phenomenon observed within protein filaments of the cytoskeletons of many cells, especially in actin filaments and microtubules. It occurs when one end of a filament grows in length while the other end shrinks, resulting in a section of filament seemingly "moving" across a stratum or the cytosol .
Dr. Shrinker (Jay Robinson) is a mad scientist who creates a shrinking ray that can miniaturize anything.Three teenagers — Brad Fulton (), B.J. Masterson (Susan Lawrence) and her brother Gordie Masterson (Jeff MacKay) — crash land their airplane on an island.
Fixation rates can easily be modeled as well to see how long it takes for a gene to become fixed with varying population sizes and generations. For example, The Biology Project Genetic Drift Simulation allows to model genetic drift and see how quickly the gene for worm color goes to fixation in terms of generations for different population sizes.
The video seamlessly cuts to kids jumping into the frame on the other side, now high school seniors clad in caps and gowns. View this post on Instagram A post shared by Mr. Tausch ...
In biology, nastic movements are non-directional responses to stimuli (e.g. temperature, humidity, light irradiance) that occur more rapidly than tropisms and are usually associated with plants. The movement can be due to changes in turgor (internal pressure within plant cells). Decrease in turgor pressure causes shrinkage, while increase in ...
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