Results 151 to 160 of about 1,602 (195)
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Hartmannella vermiformis Inhibition of Legionella pneumophila Cultivability
Microbial Ecology, 2013Hartmannella vermiformis and Acanthamoeba polyphaga are frequently isolated from drinking water and permissive to Legionella pneumophila parasitization. In this study, extracellular factor(s) produced by H. vermiformis and A. polyphaga were assessed for their effects on cultivability of L. pneumophila.
Helen Y, Buse +2 more
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2016
Hartmannella / Copromyxa The 18S rDNA sequences of the two strains most closely related to Hartmannella / Copromyxa were highly divergent (p -distance 9.4%, 113 differing positions). In the ML phylogeny (Fig. 4A) they were most closely related to and had a basal position in the lineage including Copromyxa protea, Copromyxa / Hartmannella ...
Van Wichelen, Jeroen +6 more
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Hartmannella / Copromyxa The 18S rDNA sequences of the two strains most closely related to Hartmannella / Copromyxa were highly divergent (p -distance 9.4%, 113 differing positions). In the ML phylogeny (Fig. 4A) they were most closely related to and had a basal position in the lineage including Copromyxa protea, Copromyxa / Hartmannella ...
Van Wichelen, Jeroen +6 more
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A Lecithinase from the Amoeba Hartmannella rhysodes*
The Journal of Protozoology, 1970SYNOPSIS A lipogenic toxin produced by the amoeba Hartmannella rhysodes, Fernald strain, made mammalian cells in culture round up and fill with fat droplets. From this toxin an enzyme was obtained with lecithinase and lysolecithinase activities. This enzyme is different from any isolated elsewhere.
C, Elson, R P, Geyer, R S, Chang
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l-Threonine dehydratase activity of axenically grown Hartmannella culbertsoni
Archiv f�r Mikrobiologie, 19720730 09 1. l-Threonine dehydratase (E.C. 4.2.1.16) activity in the cell-free extracts of the trophozoites of Hartmannella culbertsoni has been purified 20-fold. 2. The enzyme requires pyridoxal-5-phosphate for its activity and is not cold-labile.
M K, Raizada, V K, Rao
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Environmental induction of multinucleate Hartmannella rhysodes
Experimental Cell Research, 1963Abstract 1. 1. When Hartmannella rhysodes was incubated in a static culture the amoebae were uniform in size and uninucleate. 2. 2. Under agitated conditions, in a fluid medium, the amoebae exhibited a variety of body sizes, nuclear sizes and nuclear numbers.
R.N. Band, Christine Machemer
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Carbohydrate Utilization by the Soil Amoeba Hartmannella castellanii
The Journal of Protozoology, 1967SYNOPSIS. Carbohydrate utilization by 9 strains of Hartmannella castellanii has been studied by growing the amoebae in a chemically defined medium which did not support growth without an added energy source. Strains differed in the utilization of sucrose, raffinose, melibiose and mannitol. The strains which did not use sucrose for growth were shown to
K M, Adam, D A, Blewett
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Attachment and Entry of Legionella pneumophila in Hartmannella vermiformis
Journal of Infectious Diseases, 1993Legionella pneumophila is an intracellular parasite of Hartmannella vermiformis. Attachment to the amebae and entry of L. pneumophila were studied by two quantitative assays: One used plate counts to measure the number of bacteria attaching to amebae at 4 degrees C; the other determined the number of intracellular bacteria by use of transmission ...
B S, Fields +5 more
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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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