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A specific pair of GROUP C CHROMOSOMES of the human chromosome classification.

A specific pair of GROUP C CHROMOSOMES of the human chromosome classification.

A specific pair of GROUP C CHROMSOMES of the human chromosome classification.

The human female sex chromosome, being the differential sex chromosome carried by half the male gametes and all female gametes in humans.

The human male sex chromosome, being the differential sex chromosome carried by half the male gametes and none of the female gametes in humans.

Structures within the CELL NUCLEUS of insect cells containing DNA.

Complex nucleoprotein structures which contain the genomic DNA and are part of the CELL NUCLEUS of MAMMALS.

Complex nucleoprotein structures which contain the genomic DNA and are part of the CELL NUCLEUS of PLANTS.

The shortest duration of an electrical stimulus where the threshold amplitude is twice the rheobase - the minimum required for eliciting an ACTION PO…

Biological systems as affected by time. Aging, biological rhythms, and cyclic phenomena are included. Statistical, computer-aided mathematical proced…

Works about the temporal sequence of events.

Absorption, metabolism and elimination of drugs in relation to time of day at which they are administered, and the mechanisms responsible for time-de…

The natural inclination or preference of time of day in which an individual or an organism has the most activity, particularly as it relates to sleep…

Biological mechanism that controls CIRCADIAN RHYTHM. Circadian clocks exist in the simplest form in cyanobacteria and as more complex systems in fung…

The regular recurrence, in cycles of about 24 hours, of biological processes or activities, such as sensitivity to drugs or environmental and physiol…

Alternating sets of exercise that work out different muscle groups and that also alternate between aerobic and anaerobic exercises, which, when combi…

Functional processes and properties characteristic of the BLOOD; CARDIOVASCULAR SYSTEM; and RESPIRATORY SYSTEM.

A large or important municipality of a country, usually a major metropolitan center.

A series of oxidative reactions in the breakdown of acetyl units derived from GLUCOSE; FATTY ACIDS; or AMINO ACIDS by means of tricarboxylic acid int…

Conversion of ARGININE residues in proteins into CITRULLINE residues by PROTEIN-ARGININE DEIMINASES.

Physiologic period, characterized by endocrine and somatic changes with the termination of ovarian function in the female. It may also accompany the …

The longterm manifestations of WEATHER. (McGraw-Hill Dictionary of Scientific and Technical Terms, 6th ed)

Any significant change in measures of climate (such as temperature, precipitation, or wind) lasting for an extended period (decades or longer). It ma…

Characteristic events occurring in the ATMOSPHERE during the interactions and transformation of various atmospheric components and conditions.

Functional inactivation of T- or B-lymphocytes rendering them incapable of eliciting an immune response to antigen. This occurs through different mec…

Removal, via CELL DEATH, of immature lymphocytes that interact with antigens during maturation. For T-lymphocytes this occurs in the thymus and ensur…

The process of accumulation of genetic and epigenetic changes over time in individual cells and the effect of the changes on CELL PROLIFERATION.

Expansion of blood cells arising from mutant HEMATOPOIETIC STEM CELLS often related to aging. Mutations on epigenetic regulator genes are common in c…

LYMPHOCYTE ACTIVATION by a specific ANTIGEN thus triggering clonal expansion of LYMPHOCYTES already capable of mounting an immune response to the ant…

The lung volume at which the dependent lung zones cease to ventilate presumably as a result of airway closure.