migration-inhibitory factor
(Science: growth factor) A soluble, nondialysable factor that is produced by sensitised lymphocytes following exposure to a specific antigen. It inhibits macrophage migration and causes adherence.
The migration of different cell types, such as leucocytes and tumour cells, involves cellular strategies to overcome the physical resistance of three-dimensional tissue networks, ...
Migration
Migration is often an important density-dependent factor in reducing populations. As the population increases, many of its members emigrate.
Predation ...
migration Movement of organisms either permanently (as in the migration of humans to the Americas) or temporarily (migratory birds such as Canadian geese).
Immigration moving into a new location
(im = in; migrare = to move‚ depart)
Immune System the system which protects the body from foreign invaders (viruses‚ bacteria‚ cancer‚ etc.)
(immun = safe‚ free) ...
Branch migration
A "zipper-like" pairing of two homologous DNA strands during genetic recombination.
Branch migration The ability of a DNA strand partly paired with its complementary strand to move, displacing its homologous resident strand and extending the pairing.
Migration
Movement of individuals between otherwise reproductively isolated populations.
Migration into or out of a population can breakdown genetic differences between populations. Mutations developing in one population may be spread to other populations by migration. This serves, like mutation, to introduce new alleles into populations.
Migration into or out of a population can change allele frequencies. Immigration may add new genetic material to the established gene pool of a population. Conversely, emigration may remove genetic material.
migration A seasonal movement from one location to another.
Milankovitch cycles Periodic variations in tilt, eccentricity, and wobble in the earth's orbit; Milutin Milankovitch suggested that it is responsible for cyclic weather changes.
the migration of individual cells from surface layers into the interior of the embryo.
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z ...
Cell migrations are a prominent feature of this developmental stage
The Biology Project Department of Biochemistry and Molecular Biophysics The University of Arizona Thursday, October 30, 1997
Contact the Development Team ...
Human Migration Hypotheses
Most scientists agree that an early hominid species evolved in Africa and spread across the Old World.
In 1924, the Immigration Restriction Act was passed, with eugenicists for the first time playing a central role in the Congressional debate, as expert advisers on the threat of "inferior stock" from Eastern and Southern Europe.
Since OPM queries are ultimately translated to one or more relational SQL queries by the OPM tools anyway, we can perform this translation at an earlier stage of the query process, producing SQL to which CPL can apply its maximal subquery migration ...
Law -- the concept that both gene frequencies and genotype frequencies will remain constant from generation to generation in an infinitely large, interbreeding population in which mating is at random and there is no selection, migration or mutation.
Founder effect is a phenomenon in the work that we do that refers to the migration of a small group of people from a larger population to go settle in another environment.
The chromaphil and sympathetic cells are indistinguishable from one another at the time of their migration from the spinal ganglia to the regions occupied in the adult. Differentiation of chromaphil cells begins in embryos about 18 mm.
Differentiation between subpopulations, followed by migration among them, could contribute to adaptations amongst populations. Wright also came up with the idea of the adaptive landscape -- an idea that remains influential to this day.
These form by cell divisions, migrations, and rearrangements and are the forerunners of specialized tissues and organs. The ectoderm is the outermost primary tissue layer that forms first in all animal embryos.
volvo - to roll]. A process of cellular migration involving movement of a sheet of cells over an edge and then spreading inwards in the opposite direction. This occurs, for example, during amphibian gastrulation.
ingression - the migration of individual cells from surface layers into the interior of the embryo.
intercalate - to insert or interpose ...
Examples are the rapid movement of cells in developing embryos, organ-to-organ spreading of malignant cancer cells, and the migration of neural axons to synaptic targets.
Bering Land Bridge -- n. The vast tundra plain that was exposed between Asia and North America during the Last Glacial Maximum, about 21,000 years ago; it served as a migration route for people, animals, and plants. Also known as Beringia.
Biogeography studies the spatial distribution of organisms on the Earth,[64] focusing on topics like plate tectonics, climate change, dispersal and migration, and cladistics.
Branches of biology
Main article: List of biology disciplines ...
PULSED-FIELD GEL ELECTROPHORESIS (PFGE) - Separation of large (>50 kb) pieces of DNA, including complete chromosomes and genomes, by rapidly alternating the direction of electrophoretic migration in agarose gels.
 See also: Organ, Trans, Human, Animal, Origin
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