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  Home >> Molecular Biology Dictionary >> Long Day Plant - Lysogeny


Long-day plant

Plant requiring short nights before flowering is initiated.

Long interspersed nuclear elements
See LINEs.

Long template
A DNA strand that is synthesized during the polymerase chain reaction and has a primer sequence at one end but is extended beyond the site that is complementary to the second" primer at the other end.

Long terminal repeat (LTR)
A string of bases that occurs at each end of the "genome" of a retrovirus that has become integrated into the host genome. Involved in the integration process.

LPS.
See lipopolysaccharide.

LTR
See long terminal repeat.

Lux
(51 symbol: Ix) The unit of measurement for illuminance (i.e., the amount of illumination) impinging upon a surface. 1 Ix is the illuminance impinging upon a surface of 1 m2, each point of which is at a distance of 1 m away from a uniform point source of light of 1 cd (candela). It supersedes the foot-candle. See foot-candle; photon.

Luxury consumption
Nutrient absorption by an organism in excess of that required for optimum growth and productivity.

Luteinizing hormone
A pituitary hormone which causes growth of the yellow body of the ovary and also stimulates activity of the interstitial cells of the testis.

Lymphocyte
A general class of white blood cells that are important components of the immune system of vertebrates.

Lymphokine
Generic name for proteins that are released by lymphocytes to act on other cells involved in the immune response. The term includes interleukins and interferons.

Lymphoma
Cancer originating in the lymph nodes, spleen and other lympho-reticular sites.

Lyophilize
Rapid freezing followed by a dehydration under high vacuum. The process is lyophilization cf freeze-drying.

Lysis
(Gr. lysis, a losing) The destruction or breakage of cells either by viruses or by chemical or physical treatment.

Lysogen
A bacterial cell whose chromosome contains integrated viral DNA.

Lysogenic
A type or phase of the virus life cycle during which the virus integrates into the host chromosome of the infected cell, remaining essentially dormant for some period of time. See lysogen.

Lysogenic bacteria
Bacteria harbouring temperate (non-virulent, lysogenic) bacteriophages.

Lysogeny
A condition in which a bacteriophage genome (pro-phage)' survives within a host bacterium, either as part of the host chromosome or as part of an extrachromosomal element, and does not initiate lytic functions.

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