migration

T cell

...eukaryotes ). Full article >>> The migration of different cell types, such as leucocyte s and tumour cells , involves cellular strategies to overcome the physical resistance of three-dimensional tissue networks, ... Full article >>> AIDS occurs when lymphocytes , particul...

Stomach

...ollowing the blastula stage during which cell migration s form distinct germ layers. The primitive gut ( archenteron ) is formed and opens to the exterior through the blastopore . Full article >>> Salt-cured or pickled foods cause cancer s in the stomach and esophagus . Smoked foods su...

Stoma

...ollowing the blastula stage during which cell migration s form distinct germ layers. The primitive gut ( archenteron ) is formed and opens to the exterior through the blastopore . Full article >>> Hereditary dis order caused by a mutant allele of a single gene (e.g., Duchenne muscul...

Speciation

...cally (for example, by habitat fragmentation or migration ). Full article >>> speciation in which the evolution of reproductive isolating mechanisms occurs within the range and habitat of the parent species . This form of speciation may be common in parasites . A B C D E F G H I J K...

Restriction enzymes

...tion enzymes . cointegrate An intermediate in the migration of certain DNA transposon s in which the donor DNA and target DNA are covalently attached. Full article >>>...

Restriction enzyme

...ion enzyme s . cointegrate An intermediate in the migration of certain DNA transposon s in which the donor DNA and target DNA are covalently attached. Full article >>>...

Resolution

...ferential use of matrixdegrading enzymes in the migration processes of different cell types within the three-dimensional ECM. Full article >>> One is using positron emission tomography to image whole brains, and they can do that at a resolution of small bunches of cells . Full article ...

Random mating

...nd experiences: No selection No mutation No migration ( gene flow ) ... Full article >>> ... of random mating in the absence of mutation , migration , ... Full article >>>...

Prophase

...ndensation, nuclear membrane breakdown, and the migration of centrioles to opposite poles. prophase I: the first phase of meiotic division , during which crossing over takes place. Full article >>> prophase [Gk. pro, before + phasis, form] The first stage of mitosis , during which ...

Primitive streak

...rgin of an amniote embryo that forms during the migration of endoderm al and mesoderm al cells into the interior of the embryo . Full article >>> primitive streak A line of cells in the center of the embryo nic disk of reptiles, birds, and mammals that forms the future axis of th...

Population genetics

...ural selection , genetic drift , mutation , and migration . Full article >>> Population gene...tural selection , genetic drift , mutation and migration . Full article >>> Population genetics is basically genetics of the particular t...

Population

...tural selection , genetic drift , mutation and migration . Full article >>> Population Cycles The Carrying Capacity of the Environment r-Strategists and K-Strategists Population Density and Shifts in Strategy ... Full article >>> Population s evolve. [ evolution : ...

Phage

... ... Full article >>> macro phage migration inhibitory factor (MIF) Cytokine released by sensitized lymphocytes that tends to inhibit migration of macrophages in the immediate vicinity, ... Full article >>> macro phage (mak-roh...

PFGE

...idly alternating the direction of electrophoretic migration in agarose gels . Full article >>>...

Nuclear membrane

...ndensation, nuclear membrane breakdown, and the migration of centrioles to opposite poles. prophase I: the first phase of meiotic division , during which crossing over takes place. Full article >>> An extensive membranous network in eukaryotic cells , continuous with the outer nucle...

MtDNA

...#62;> Amerind mtDNA suggests two waves of migration (one perhaps as old as 21-42 thousand years ago)....c model confirms the accepted ideas about human migration into the Americas and suggests a possible fourth wave. Full article >>>...

MSH2

...to mismatch repair enzymes could block branch migration (ref). In vitro, the S. cerevisiae mismatch repair protein MSH2 specifically binds to Holliday junctions (ref). Full article >>>...

Mitochondrial DNA

...of Siberia. Amerind mtDNA suggests two waves of migration (one perhaps as old as 21-42 thousand years ago)....an " family tree" and for tracing early human migration s. Full article >>> Wayne and Jenks, in a recent Nature, present a study of the mtDN...

Mismatch repair

...to mismatch repair enzymes could block branch migration (ref). In vitro, the S. cerevisiae mismatch repair protein MSH2 specifically binds to Holliday junctions (ref). Full article >>>...

Migration

The migration of different cell types, such as leucocyte s a...orks, ... Full article >>> Branch migration in naked DNA From bacteria trans formed with circular plasmid s, one can isolate figure 8 t...

Leucocyte

... V. Mosby ... Full article >>> The migration of different cell types, such as leucocyte s and tumour cells , involves cellular strategies to overcome the physical resistance of three-dimensional tissue networks, ... Full article >>> leucocyte A white blood cell ; typica...

Larva

... the rest of their life except for their spawning migration s towards Lofoten. Full article >>> Developmental stages in the larva are associated with the appearance of chromosomal puffs. These are where DNA is unwound and actively being trans cribed. Full article >>> complet...

Insert

...and cause problems (embol = insert ed a wedge) E migration moving out of a location (e- = out; migrare = to move depart) ... Full article >>> : Mutation s, usually deletion s or insert ion s, that change the reading frame of the codon triplets. Fruit ... Full article >>>...

Holliday structure

RecA-catalyzed branch migration is slower than branch migration in naked Holliday structure s. However, the recA branch migration is unidirectional, while the z...

Genetic recombination

...ppened as a result of mutation s, as a result of migration s between human groups, the exchange of genes between groups, genetic recombination , ... Full article >>> Heteroduplex Dna : Generated by base pair ing between complement ary single strand s derived from different parental dupl...

Gene flow

...ene flow (also called gene admixture or simply migration ) is introduction of variation into a populatio... population s through interbreeding as well as by migration of breed ing individuals. Gene flow increases variation within a population by introducing n...

Gastrulation

...id down and the gut formed through complex cell migration s. Full article >>> Gastrulation ...#62; Gastrulation involves a series of cell migration s to positions where they will form the three primary cell layers. Ectoderm forms the outer laye...

Gastrula

...ollowing the blastula stage during which cell migration s form distinct germ layers. Full article >&#...2; Gastrula tion involves a series of cell migration s to positions where they will form the three primary cell layers. Ectoderm forms the outer laye...

Fossil

... scientists have uncovered remnants of an ancient migration that occurred within our early vertebrate ancestors. Full article >>> animal fossil s were found. The first period in the Palaeozoic era marked by the occurrence of many forms of invertebrate life (540-500 Mya ). Full article &#...

Fibroblast

...s 10. Full article >>> Proteolytic migration is achieved by slow-moving cells , such as fibroblast s and mesenchymally moving tumour cells , by engaging matrix metalloproteinases, ... Full article >>> Using primarily the human BAC library constructed from fibroblast s, w...

Equilibrium

... long as there is no selection , mutation , or migration . For a bi-allelic locus where the gene frequencies are p and q: p2+2pq+q2 = 1 ( ... Full article >>> partition coefficient A constant that express es the ratio in which a given solute will be partitioned or distributed between tw...

Community

...n is the sequential replacement of species by im migration of new species and local extinction of older ones following a disturbance that creates unoccupied habitat s for colon ization. Full article >>> Community Data bases Community data bases are shared resources, open to the en...

Chromosomes

...idly alternating the direction of electrophoretic migration in agarose gels . Full article >>> A short DNA sequence of a few hundred base pair s is required to support the autonomous replication of the chromosomes . Related YAC ... Full article >>> In modern research, ge...

Centrioles

...ndensation, nuclear membrane breakdown, and the migration of centrioles to opposite poles. prophase I: the first phase of meiotic division , during which crossing over takes place. Full article >>> centrosome Minute body in cytoplasm of many plant and animal cells that conta...

Centriole

...nder-like organelle that assists in chromosomal migration during mitosis . centromere : the place of attachment of the two homologous chromatid s during prophase in mitosis . Full article >>> centriole (sen-tree-ole) [Gk. kentron, center] A structure in an animal cell , composed o...

Cell wall

...nder-like organelle that assists in chromosomal migration during mitosis . Full article >>> cell wall The rigid outermost layer of the cells found in plant s, some protist s, and most bacteria . Found in plant s composed principally of cellulose . Full article >>> c...

Cells

... explanation. Full article >>> The migration of different cell types, such as leucocyte s and tumour cells , involves cellular strategies to overcome the physical resistance of three-dimensional tissue networks, ... Full article >>> Cells in culture , stained for kerat...

Cell division

...#62;> This involves cell division , cell migration , and the differentiation of cells into the many types found in the baby. Full article >>> meiosis -- A two-stage type of cell division in sexual ly reproducing organ isms. In meiosis , a diploid cell divides to produce fo...

Cell

...nder-like organelle that assists in chromosomal migration during mitosis . Full article >>> cell Minute biological compartments within which the processes of life are carried out. cell body Portion of a nerve cell that includes a cytoplasm ic mass and a nucleolus , and from which ...

Branch migration

Branch migration in naked DNA From bacteria trans formed wit... (above). Full article >>> Branch migration A "zipper-like" pairing of two homologous DNA strand s during genetic recombination . Full ar...

Biogeography

...late tectonics , climate change, dispersal and migration , and cladistics . [edit] History of the word " biology " ... Full article >>> See also: biogeography , Amazonian forest, extinction , Unified neutral theory of biodiversity . Is biodiversity threatened? Full article >>...

Belly

...id down and the gut formed through complex cell migration s. Full article >>> Artistic representations of Akhenaten give him a strikingly feminine appearance, with slender limbs, a protruding belly and wide hips, giving rise to controversial theories such that he may have actually been a wo...

Alleles

...gain of alleles from a population due to the e migration or im migration of fertile individuals, or the trans fer of gametes , between population s. gene pool The tota...

Abdomen

... U.S. Full article >>> germ- cell migration (Deshpande et al.2001) optic lamina (Huang and Kunes 1996,1998) gonad (Forbes et al.1996;Zhang and Kalderon 2000) abdomen (Struhl et al.1997) gut (Pankratz and Hoch 1995) trachea l system (Glazer and Shilo 2001). Full article >>>...