Results 181 to 190 of about 2,058 (214)
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CHEMOTAXIS IN THE FREE LIVING AMOEBA (HARTMANNELLA RHYSODES)
Australian Journal of Experimental Biology and Medical Science, 1969SummaryA method for the quantitative measurement of chemotaxis in amoebae is described. Using this method it has been possible to demonstrate that the chemotactic movement of Hartmannella rhysodes towards a food source is due to the presence of a chemotactic factor released from the food source as the result of interaction of substances, possibly ...
J, McIntyre, C R, Jenkin
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Hartmannella: Growth controlling substances in culture medium
Protoplasma, 1970Growth inhibiting thermolabile factor(s) accumulate in some of the axenic media during growth ofHartmannella cultures. The physiological effectiveness of the factors depends in a not understood way on the concentration of cells in culture. The factor may be active antigenically.
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Starvation and Encystment of a Soil Amoeba Hartmannella castellanii*
The Journal of Protozoology, 1968SYNOPSIS. The behavior of the amoeba H. castellanii was investigated in various carbon and nitrogen deficient media with a view to developing a satisfactory replacement medium for the study of encystment and excystment. Media which had been devised for other soil amoebae did not cause H. castellanii to encyst.
A J, Griffiths, D E, Hughes
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Effect of bioamines on the cellular differentiation of Hartmannella culbertsoni
Biochemical Pharmacology, 1974Abstract Epinephrine, 5-hydroxytryptamine, dopamine and tyramine induce axenic encystation of the free living amoeba Hartmannella culbertsoni . Cycloheximide inhibits encystation of amoeba mediated by the amines. The amines uniformly stimulate 3 to 4-fold the ability of the cells to synthesize cyclic 3′,5′-adenosine monophosphate from adenosine ...
A K, Verma, M K, Raizada, C K, Murti
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Two New Species of Hartmannella Amebae Infecting Freshwater Mollusks
The Journal of Protozoology, 1968SYNOPSIS. Two new species of small amebae, Hartmannella biparia n. sp. and Hartmannella quadriparia n. sp., were 1st observed in the freshwater mollusks Bulinus globosus and Biomphalaria pallida, respectively. The amebae multiplied in cytoplasmic vacuoles in host cells, particularly in foci in the mantle collar, foot, and intestinal wall.
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Extrinsic Requirements for Encystation by the Soil Amoeba, Hartmannella rhysodes*
The Journal of Protozoology, 1963SYNOPSIS. The environmental factors causing encystation in Hartmannella rhysodes, a small soil amoeba, appear to be an elevated osmotic pressure, Ca2+ and Mg2+, aeration and a decrease in carbon sources. After 36 hr under these conditions, amoebae harvested during active growth encyst. Nutrients essential for growth, other than carbon sources, have no
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The Physiology of Encystment of Hartmannella castellanii*
The Journal of Protozoology, 1969SYNOPSIS. Some aspects of the physiology of encystment of the soil amoeba Hartmannella castellanii in a replacement encystment medium consisting of 5 × 10‐2 M MgCl2 have been investigated. It is suggested that measurement of the cellulose produced during encystment in the synthesis of the cyst wall is a more reliable measure of the process than other ...
A. J. GRIFFITHS, D. E. HUGHES
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Intracellular survival of Francisella tularensis in Hartmannella vermiformis
2010Francisella tularensis is a highly infectious, facultative intracellular bacterium and the causative agent of tularemia. The natural reservoir of the bacterium is largely unknown. Although it has been shown that protozoa may harbor it the reservoir in nature has not been definitely identified. In this study, the ability of F. tularensis subsp. novicida
Ožanič, Mateja, Šantić, Marina
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American Journal of Clinical Pathology, 1966
P. W. Ensminger, C. G. Culbertson
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P. W. Ensminger, C. G. Culbertson
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