Category: N

Abnormal smallness, dwarfism.  

Antibiotic used to treat infections caused by penicillin-resistant strains of staphylococci. Adverse effects include allergic reactions and gastrointestinal upsets.  

Beta blocking agent used to treat hypertension and angina. Adverse effects include cardiac arrhythmias, gastrointestinal disturbances, and allergic reactions. Nadolol is a beta-blocker medication employed in managing hypertension (high blood pressure), angina pectoris (chest pain arising from inadequate blood flow to the heart muscle), and specific forms of arrhythmia (irregular heartbeats). Additionally, nadolol is utilized…

Medium for testing the proteolytic action of bacteria. Gelatin, 15 per cent, is added to nutrient broth, dissolved with heat, cleaned with white of egg and filtration, and sterilized. The medium sets at 24°C, unless permanently liquefied by the action of inoculated proteolytic organisms. A bacterial culture medium composed of broth and gelatin.  

Stock bacteriological broth composed of meat extract base with added water, peptone and salt. The mixture is heated, filtered and sterilized.  

Those enterobacteria which ferment lactose peptone-water irregularly, late, or not at all—Salmonella, Shigella, Arizona, Bethesda – Ballerup group, AIkalescens – Dispar group, Citrobacter, Proteus, Serratia and Hafnia genera.  

Type-species of the Nocardia, a markedly acid-fast branching mycelial organism with grey-white to yellowish colonies. Associated with tuberculous-like processes in cattle. Non-acid-fast species, colonies white, buff or crimson, but chromogenicity is unpredictable. Actinomycosis-like pus is formed in the tissues. Associated with Madura foot (tropical and subtropical areas) but this condition is also as often fungal…

Species associated with brain abscess and with pulmonary tuberculosis-like disease. Fine mycelium, acid-fast, pigmentation yellow to red according to medium; easy of cultivation. First described by Eppinger in 1891. A species pathogenic for humans in which abscesses called mycetomas arise in the skin. The invasion site may be the lungs or skin.  

Test of the ability of mycobacteria to produce nicotinic acid (niacin). Well grown cultures on solid media are treated with cyanogen bromide followed by aniline or o-tolidine; a yellow colour is produced if niacin is present. Only tuberculosis gives a positive result. Test papers avoid the dangers of the chemicals mentioned above.  

Method for the volutin (metachromatic) granules of C. diphtheriae and allied organisms. The film is stained with a special methylene blue solution, treated with iodine, and counter- stained with neutral red. The granules show blue, the protoplasm of the organisms (and of non-granular bacteria), pink.