From Big Medical Encyclopedia

MICROSOMES (grech, mikros small + soma a body) — fragments of intracellular membranes, in particular membranes of an endocytoplasmic reticulum, formed at homogenization of cells of animal or vegetable fabrics. From homogenate M. allocate by means of differential centrifuging (see). The sizes M. are within 100 nanometers In M. a large amount of the RNA and enzymes which are taking part in synthesis of protein is revealed. Distinguish two types M.: with a smooth and rough surface; the last represent fragments of membranes with located on them ribosomes (see).