MICR 2420 Chapter 21-26: Textbook Notes After 2nd Midterm
6 Dec 2015
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Apcs - phagocytic cells that degrade larger antigens and expose antigenic determinants. Mhc - membrane surface protein that presents antigen. Threshold dose - level of an antigen required for an optimal immune response; too little will only create few. B-cells, too much will cause b-cell tolerance where b- cells have been overproduced and will not respond to subsequent antigen exposures. Immunological specificity - an immune response to one antigen is not effective against a different antigen. Induction of a quorum-sensing gene system requires the accumulation of a secreted small molecule called an autoinducer, usually a homoserine lactone. Neuston - the air-water interface of the ocean. Euphotic zone - upper part of the water column that receives light for phototrophs. Aphotic zone - below the reach of light; only heterotrophs and lithotrophs can grow. Benthos - where the water column meets the ocean floor; organisms that live here are called benthic microbes and are mostly barophiles.
