The Prolongation of the Viability of Cultures of E. histolytica by the Addition of Streptomycin

Spingarn, Clifford L.; Edelman, Morton H.

doi:10.2307/3273677

Cited by 8 publications

(1 citation statement)

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“…To inhibit bacterial growth in cultures of Entamoeba, various antibiotics have been tried. For example, Spingarn and Edelman (1947) found that when streptomycin was added in the amount of 1000-3000 units per cc. to culture of E. histolytica, the survival of the amoebae in culture was prolonged from an average of 8 days to 33.7 days, which effect was apparently due to the inhibition of bacteria.…”

Section: A Free-living Protozoamentioning

confidence: 99%

Protozoology

Kudo¹

1954

125

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PROTOZOOLOGY adopted, since it includes undoubted animals and plants, thus creating an equal amount of confusion between it and the animal or the plant. Calkins (1933) excluded chromatophore-bearing Mastigophora from his treatment of Protozoa, thus placing organisms similar in every way, except the presence or absence of chromatophores, in two different (animal and plant) groups. This intermingling of characteristics between the two groups of microorganisms shows clearly their close interrelationship and suggests strongly their common ancestry.Although the majority of Protozoa are solitary and the body is composed of a single cell, there are several forms in which the organism is made up of more than one cell. These forms, which are called colonial Protozoa (p. 173), are well represented by the members of Phytomastigina, in which the individuals are either joined by cytoplasmic threads or embedded in a common matrix. These cells are alike both in structure and in function, although in a few forms there may be a differentiation of the individuals into reproductive and vegetative cells. Unlike the cells in a metazoan which form tissues, these vegetative cells of colonial Protozoa are not so dependent upon other cells as are the cells in Metazoa; therefore, they do not form any true tissue. The reproductive cells produce zygotes through sexual fusion, which subsequently undergo repeated division and may produce a stage comparable with the blastula stage of a metazoan, but never reaching the gastrula stage. Thus, colonial Protozoa are only cell-aggregates without histological differentiation and may thus be distinguished from the Metazoa.An enormous number of species of Protozoa are known to man.From comparatively simple forms such as Amoeba, up to highly complicated organisms as represented by numerous ciliates, the Protozoa vary exceedingly in their body organization, morphological characteristics, behavior, habitat, etc., which necessitates a taxonomic arrangement for proper consideration as set forth in detail in Chapters 8 to 44. Relationship of protozoology to other fields of biological science A brief consideration of the relationship of Protozoology to other fields of biology and its possible applications may not be out of place here. Since the Protozoa are single-celled animals manifesting the characteristics common to all living things, they have been studied by numerous investigators with a view to discovering the nature and mechanism of various phenomena, the years, it has now become known that some 25 species of Protozoa occur in man. Entamoeba histolytica, Balantidium coli, and four species of Plasmodium, all of which are pathogenic to man, are widely distributed throughout the world. In certain restricted areas are found other pathogenic forms, such as Trypanosoma and Leishmania. Since all parasitic Protozoa presumably have originated in free-living forms and since our knowledge of the morphology, physiology, and reproduction of the parasitic forms has largely been obtained in conjunction with the stu...

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Section: A Free-living Protozoamentioning

confidence: 99%