extrachromosomal factor

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• Sex allocation — is the allocation of resources to male versus female reproduction in sexual species (Charnov 1982). Sex allocation depends upon the breeding system of a species, as well as how reproduction is carried out within each breeding system. Breeding… …   Wikipedia

• Plasmid — A self replicating (autonomous) circle of DNA distinct from the chromosomal genome of bacteria. A plasmid contains genes normally not essential for cell growth or survival. Some plasmids can integrate into the host genome, be artificially… …   Medical dictionary

• Senescence — refers to the biological processes of a living organism approaching an advanced age (i.e., the combination of processes of deterioration which follow the period of development of an organism). The word senescence is derived from the Latin word… …   Wikipedia

• episome — An extrachromosomal element (plasmid) that may either integrate into the bacterial chromosome of the host or replicate and function stably when physically separated from the chromosome. [epi + G. soma, body ( …   Medical dictionary

• Lyme disease microbiology — Lyme disease, or borreliosis, is caused by Gram negative spirochetal bacteria from the genus Borrelia , which has at least 37 known species, 12 of which are Lyme related, and an unknown number of genomic strains. Borrelia species known to cause… …   Wikipedia

• Phytoplasma — Phyllody induced by phytoplasma infection on a coneflower (Echinacea purpurea). Scientific classification Division …   Wikipedia

• Calorie restriction — Calorie restriction, or caloric restriction (CR), aims to improve health and slow the aging process by limiting dietary energy intake. Calorie restriction is a common measure, found in several dietary regimens, including the Okinawa diet [The… …   Wikipedia

• Telosoma — Imagen de microscopía que muestra cromosomas preparados mediante una técnica conocida como FISH (Hibridación fluorescente in situ), en la que se observan los telómeros en amarillo …   Wikipedia Español

• virus — viruslike, adj. /vuy reuhs/, n., pl. viruses. 1. an ultramicroscopic (20 to 300 nm in diameter), metabolically inert, infectious agent that replicates only within the cells of living hosts, mainly bacteria, plants, and animals: composed of an RNA …   Universalium

• Gene — The basic biological unit of heredity. A segment of deoxyribonucleic acid (DNA) needed to contribute to a function. An official definition: According to the official Guidelines for Human Gene Nomenclature, a gene is defined as a DNA segment that… …   Medical dictionary