Results 181 to 190 of about 12,746 (209)

Respiration of Leishmania mexicana amastigotes and promastigotes

Molecular and Biochemical Parasitology, 1981
Promastigotes of Leishmania mexicana mexicana recently derived from amastigotes by transformation in vitro respired at a rate (17 nmol O2/min per 10(8) parasites) 4-5 times higher than that of amastigotes, but when the difference in cell protein content between the two preparations was taken into account the rates were not significantly different (32 ...
D T, Hart, K, Vickerman, G H, Coombs
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Leishmania braziliensis: Localization of glycoproteins in promastigotes

Experimental Parasitology, 1986
Two species of glycoproteins from Leishmania braziliensis promastigotes of apparent molecular weights of 53,000 (glycoprotein 53) and 47,000 (glycoprotein 47) were localized. Four lectins with different sugar specificities bound to the blotting sheet to which the electrophoretically separated materials were transferred.
K, Nagakura, H, Tachibana, Y, Kaneda, T, Nakae   +3 more
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Polyamine transport systems of Leishmania donovani promastigotes

Life Sciences, 1997
The following observations are conjointly indicative of the presence of distinct energy-dependent, saturable and multiple polyamine transport systems in Leishmania donovani promastigotes, the causative agent for visceral leishmaniasis. Spermidine was influxed with as much as seven times higher rate than putrescine, while both spermidine and putrescine ...
M, Kandpal, B L, Tekwani
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Intracellular protein degradation in Leishmania tropica promastigotes

Molecular and Biochemical Parasitology, 1983
Abstract A labile class of proteins in the range of M r = 30 000–60 000 which turn over rapidly have been demonstrated in Leishmania tropica promastigotes. The rate of protein degradation is increased by exhaustion of nutrients or inhibition of energy metabolism.
M W, Simon, A J, Mukkada
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Leishmania species: Fatty acid composition of promastigotes

Experimental Parasitology, 1974
Abstract The fatty acid composition of the total lipid fractions of five different Leishmania organisms grown on Eagle's medium was determined by gas chromatography. The major fatty acids identified in the total lipid fractions of L. donovani, L. tropica major, L. tropica minor, L. tropica (England strain), and L.
M, Vessal, H R, Rezai, P, Pakzad
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Characterization of sinefungin-resistantLeishmania donovani promastigotes

Parasitology Research, 1993
Promastigotes resistant to sinefungin (SF), a nucleoside antibiotic that is structurally related to S-adenosylmethionine (AdoMet), were obtained starting from two cloned strains of Leishmania donovani. The resistance was induced by increasing the drug pressure gradually until promastigotes capable of growing in the presence of concentrations 10,000 ...
M A, Phelouzat, F, Lawrence, M, Robert-Gero   +2 more
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Leishmania tropica: Uptake of methionine by promastigotes

Experimental Parasitology, 1977
Abstract Promastigotes of Leishmania tropica transport methionine against a concentration gradient through a saturable system. This concentrative uptake requires metabolic energy and is sensitive to temperature and sulfhydryl reagents such as N -ethyl maleimide. Intracellular methionine exchanges with external methionine.
A J, Mukkada, M W, Simon
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Methylglyoxal-catabolizing enzymes of Leishmania donovani promastigotes

Molecular and Biochemical Parasitology, 1989
Methylglyoxal is a toxic metabolite with growth inhibitory properties against Leishmania donovani promastigotes. We have shown in the present study that both log and stationary phase promastigotes of L. donovani can catabolize methylglyoxal to D-lactate as the major end product.
K, Ghoshal, A B, Banerjee, S, Ray
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Leishmania mexicana: promastigotes migrate through osmotic gradients

Experimental Parasitology, 2002
During the insect phase of the parasite lifecycle, Leishmania promastigotes move from the midgut to the anterior regions of the alimentary tract of their sandfly vector. Chemotaxis of Leishmania promastigotes towards sugars has been reported, and the putative presence of sugar gradient in the insect foregut has been suggested to play a role in ...
Graham, Leslie, Michael, Barrett, Richard, Burchmore   +2 more
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Arginine Catabolism by Leishmania donovani Promastigotes

The Journal of Protozoology, 1992
ABSTRACT Leishmania donovani promastigotes were grown to late log phase, washed and resuspended in iso‐osmotic buffer containing L‐arginine, and the rate of urea formation was then measured under various conditions. Addition of glucose or mannose activated urea formation, whereas 2‐deoxyglucose inhibited and 6‐deoxyglucose had no effect.
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