Showing papers in "Experimental Parasitology in 1964"

TL;DR: Mice reared on a purified, semi-synthetic diet without added p -aminobenzoic acid (PABA) were only slightly susceptible, if at all, to blood-induced Plasmodium berghei infection and the oral administration of PABA at the time of infection restored full susceptibility to infection and promoted normal development of the parasite.

TL;DR: Stages of T. parva discovered in intestinal contents, gut epithelial cells, and the cells of the salivary glands are fully described, confirming the fact that the contained parasites die before the tick.

TL;DR: Extracellular cultivation of the intracellular stage of Leishmania donovani, L. tropica, and L. brasiliensis is reported and the leptomonad to leishmania transformation and the subsequent growth and multiplication of theLeishmania in a cell-free medium occurred as a result of the gradual adaptation of the cultural forms to progressively increased incubation temperatures.

TL;DR: It appeared that the number and type of auxin occurring in the galls of host plants was correlated with that of auxins found in the parasitizing nematode.

TL;DR: The conclusion was reached that parasites which have extensive somatic migrations in their life cycles are more likely to be affected by the hormone balance of the host than worms which do not have this somatic phase.

TL;DR: A sequential morphologic analysis of these allergic stages in guinea pigs in terms of histopathologic events is presented, wherein no skin reactivity was observable and no cellular abnormalities occurred.

TL;DR: Investigation of various factors which induce optimal in vitro exsheathment of the infective larvae of Dictyocaulus viviparus, Trichostrongylus colubriformis, and Haemonchus contortus reveal three distinct types of stimuli.

TL;DR: Gel-diffusion precipitin reactions given by crude Brucei trypanosome extracts with homologous antisera from rabbits were essentially identical for two unrelated strains and for antigenic variants derived from them.

TL;DR: Experimental studies to evaluate the importance of visual and tactile stimuli, frequency of feeding, longevity, and flight range of the flies as well as the size and rate of digestion of the meal likewise determine their importance as vectors of parasites.

TL;DR: The fatty acids and aldehydes from the separate phospholipids and plasmalogens of muscle and reproductive system were analyzed by gas chromotography and found to consist of mixtures of C-12 through C-20 compounds.

TL;DR: The nondiffusible fraction of dog serum obtained by dialysis is mainly responsible for this enhancing effect on the incorporation of glucose from the external medium into the glycogen of A. caninum when incubated in dog serum.

TL;DR: Comparison of determinations made by means of the glucose oxidase and the Hagedorn-Jensen techniques showed satisfactory agreement, proving that glucose, from a quantitative standpoint, is the most important carbohydrate leaked, although smaller amounts of nonglucose carbohydrates also are eliminated.

TL;DR: It was found that during the early, reproductive phase of the infection, when glucose utilization is high, the parasites contain over three times as much enzyme as the nonreproducing, ablastin-inhibited parasites found late in the infection.

TL;DR: Centrifugal fractionation of homogenates of Trypanosoma rhodesiense in 3 different aqueous sucrose media showed that the best structural and chemical differentiation of conventional nuclear, “mitochondrial,” microsomal, and cell-sap fractions was obtained with 0.25 M sucrose-5 mM magnesium sulfate.

TL;DR: Mutual grooming was a life-saving activity among animals overwhelmed by lice as a result of artificially induced postinfectious paralysis and is postulated as a factor of importance in the parasite-host relationship in wild rodents.

TL;DR: It is concluded that the scolex hooks of Echinococcus granulosus are composed of a keratin-type of protein which differs in some respects from typical vertebrate keratins.

TL;DR: In three out of four experiments rats inoculated with albumin developed a significantly increased resistance to S. mansoni that was comparable in some instances to that developed by the animals which received worm homogenates.

TL;DR: Testosterone propionate injections, in the doses which caused cyst formation in the parasites, induced precocious spermatozoon formation in testes of the treated hosts.

TL;DR: Prior infection with the cestode species, Hydatigera taeniaeformis, Taenia crassiceps, Hymenolepis microstoma, and H. citelli enhanced resistance to H. nana to a variable degree, suggesting that a species-specific factor is important in acquired immunity to this parasite.

TL;DR: The observed destruction of the sarcomeres and alterations of the mitochondria within the parasitized myofiber characterize the acute experimental myocarditis in the white mouse.

TL;DR: Experiments are described showing that injection of living larvae of the plant parasitic root-knot nematode, Meloidogyne javanica, into rabbits results in the production of antibody, which was shown to be located primarily in the γ-globulin fraction.

TL;DR: The malic dehydrogenases from A. suum had an optimum pH of 8.5 and a pH of 9.5 for reduction of oxalacetate and malate, respectively, but the enzymes became denatured when incubated at this temperature.

TL;DR: Invasive third-stage larvae of Dirofilaria immitis obtained from experimentally infected Anopheles quadrimaculatus were maintained in a culture medium in a perfusion apparatus for 30 days at 37 °C and blunting and rounding of the anterior ends in the growing larvae were conspicuous, and the caudal papillae were prominent.

TL;DR: Evidence is presented indicating that Lymnaea truncatula is not the only possible vector of Fasciola hepatica in Belgium, and the size of the experienced snails appeared to be influenced by the infection.

TL;DR: The pattern of spermatogenesis, oogenesis, and development of vitelline cells does not differ from that of the other cestode species previously studied, and a hypothesis on the homology of the preoncosphere of Cyclophyllidea with the coracidium of Pseudophyllidesa is presented.

TL;DR: The slow development of eggs exposed to sublethal radiation doses suggests that recovery from radiation damage may occur during the delayed period of embryonic differentiation.

TL;DR: Sterility induced by tretamine or thiotepa in male screw-worm flies, studied by the method of brood fractionation, was irreversible, however, the sexual vigor of males treated with sterilizing doses of these compounds was reduced, since they did not fully compete with untreated males.