Mature in Biological Definition

Gamete

... , a zygote develops , first into an embryo , and ultimately into a mature individual capable of producing gametes. Gametes from a mature diploid individual will be produced in the gonadal tissue through ...

Spermatogenesis

... spermatocytes , spermatids (after meiosis ) and then finally the fully mature spermatozoa. The female counterpart to spermatogenesis is oogenesis ... transducing neck region of tightly packed mitochondria to finally become mature testicular spermatozoa. They are then released into the lumen of the ...

Apoptosis

... on development, all tissue in multicellular animals depends on continuous receipt of survival signals. In the case of T cells, as they develop and mature in the thymus, the survival signal depends on their capability to engage foreign antigen. Those that fail in this test, amounting to about 97% of the ...

Reproduction

... and spore formation . There are a wide range of reproductive strategies employed by different species. Some animals, like the human (sexually mature after adolescence ) and Northern Gannet (5-6 years), produce few offspring. Others reproduce quickly, but unless raised in an artificial ...

Capacitation

... spermatozoa and is required to render them competent to fertilize an oocyte . This step is a biochemical event; the sperm move normally and look mature prior to capacitation. In vivo this final step typically occurs after ejaculation , in the female reproductive tract . In vitro , ...

Dialysis

... before the needles are inserted). Fistulas are widely considered the desirable way to get access for hemodialysis, but they take time to setup and mature (anywhere between 5 weeks to 15 weeks). For other patients, access may be via a catheter installed to connect to large veins in the chest. (This ...

Exon

... of a new exon, as result of mutations in intronic sequences. Splicing can be experimentally modified so that targeted exons are excluded from mature mRNA transcripts by blocking the access of splice-directing proteins to pre-mRNA using Morpholino antisense oligos. This has become a standard ...

Francis Crick

... together with the late Maurice Wilkins of University College, London. He also made significant contributions in laying the foundations of the now mature field of molecular biology . This includes work on the nature of the genetic code and the mechanisms of protein synthesis . He later left ...

Human

... that transcended the cultural boundaries of local moral codes and religions. Many humanists are religious, however, and see humanism as simply a mature expression of a common truth present in most religions. Humanists affirm the possibility of an objective truth and accept that human perception of ...

Immune system

... and neutrophil granulocytes ( polymorphonuclear leukocytes , PMN) that can engulf ( phagocytose ) foreign substances. Macrophages are thought to mature continuously from circulating monocytes. Phagocytosis involves chemotaxis , where phagocytic cells are attracted to microorganisms by means of ...

Retrovirus

... has not been developed yet. Among others, retrovirus genomes commonly contain three genes , that encode proteins that can be found back in the mature virus: gag ( g roup-specific a nti g en) codes for core and structural proteins of the virus; pol ( pol ymerase) codes for reverse ...

Reproduction

... and spore formation . There are a wide range of reproductive strategies employed by different species. Some animals, like the human (sexually mature after adolescence ) and Northern Gannet (5-6 years), produce few offspring. Others reproduce quickly, but unless raised in an artificial ...

T cell

... or if they get removed by negative selection. About 98% of T cells die in the thymus. Their remains get engulfed by macrophages. Only 2% of T cells mature and are selected to survive. These cells lose either their CD4 molecules or CD8 molecules and leave the thymus via postcapillary venules. Hormonal ...

Vacuole

... keep the cell from bursting. Contractile vacuoles are found in some freshwater protozoa . Vacuoles in plant cells: the central vacuole Most mature plant cells have a central vacuole , which often takes up more than 80% of the cell interior. It is surrounded by a membrane, called the ...