Abstract
QF the pathogenic organisms whose transmission by water has been established, the cysts of Entamoeba histolytica are apparently the most resistant to destruction by the dhemical disinfectants that are in general use today. The reaction of these cells to the newer group of synthetic detergents and their possible use in water disinfection are, therefore, of interest. The synthetic detergents are organic compounds of relatively large molecular size. Although they exhibit hydrophobic properties, they are soluble in water. Since the cohesive force between these substances and water is greater than their intermolecular cohesive force, they lower the surface tension of the water and tend to concentrate at liquidliquid, liquid-solid, and liquid-gas interfaces. Hence they are also known as surface-active agents, surface tension depressants, and wetting agents. The synthetic detergents are classified as neutral, cationic, or anionic detergents, depending upon whether they are undissociated, dissociated with cationic
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