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The Kalapalo Indians: Culture & Lifestyle

The Kalapalo Indians of Central Brazil are one of a few surviving indigenous cultures that is uniquely protected by a national reserve in lowland South America. Through no effort of their own, they have been isolated artificially from Brazilian social and economic influences that reach almost every other Indian tribe in Brazil. This unusual situation…

Diphtheria (Corynebacterium diphtheriae): History, Symptoms, Causes, Treatment

Corynebacteria are Gram-positive, aerobic, nonmotile, rod-shaped bacteria related to the Actinomycetes. They do not form spores or branch as do the actinomycetes, but they have the characteristic of forming irregular shaped, club-shaped or V-shaped arrangements in normal growth. They undergo snapping movements just after cell division which brings them into characteristic arrangements resembling Chinese letters.…