| bacterial capsules | An envelope of loose gel surrounding a bacterial cell which is associated with the virulence of pathogenic bacteria. Some capsules have a well-defined border, whereas others form a slime layer that trails off into the medium. most capsules consist of relatively simple polysaccharides but there are some bacteria whose capsules are made of polypeptides. (12 Dec 1998) |
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| brood capsules | Small hollow projections from the lining membrane of a hydatid cyst from which the scoleces arise. (05 Mar 2000) |
| capsules | Hard or soft, soluble containers of a suitable substance, for enclosing a dose of medicine, usually for oral administration. (12 Dec 1998) |
| niacin | <biochemistry> Member of the water soluble B vitamin group, used in the production of fatty acids, steroids and cholesterol, deficiency is known as pellagra. Has cholesterol-lowering and vasodilating properties. (27 Sep 1997) |
| niacin deficiency | <biochemistry> A niacin deficiency disease (pellagra) caused by improper diet and characterised by skin lesions, gastrointestinal disturbances and nervousness. Depression, dermatitis, dementia and diarrhoea are common symptoms. (27 Sep 1997) |
| niacin test | A test of the ability of mycobacteria to elaborate niacin; used to distinguish different strains. (05 Mar 2000) |