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Biomedical subjects

A G Chabaud

Publications and source records attributed to A G Chabaud.

At least 91 records · Page 5Linked to original sources
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[Dionisia bunoi n. g. n. sp., Haemoproteidae parasite of the microchiropteran bat Hipposideros cyclops in Gabon (author's transl)].

Dionisia bunoi ng. g., n. sp. is characterized by:--a) sexual dimorphism of gametocytes, macrogametocyte of the falciparum type, microgametocyte of the type malariae:--b) schizonts developing in the lumen of liver blood vessels inside a greatly hypertrophied host cell; their size remains moderate and their cytoplasm is not intensely basophilic as is usually in the young stages of Haemosporidia of Mammals. The genus has morphological characters in common with each of the 4 other genera of Haemoproteidae of Mammals. The phyletic hypothesis concerning the morphology of gametocytes and schizonts suggests that Bioccala and Dionisia are primitive.

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[New nematodes of the genus Trichospirura Smith and Chitwood, 1967, in Malaysia. Remarks on the evolution of the family Rhabdochonidae (author's transl)].

Description of Trichospirura willmottae n. sp. parasite of the salivary ducts of Tupaia glis and T. sp. (single virgin female) parasite of the intestine of Myotis mystacinus in Malaysia. The two species are very closely related to the type species, a parasite of the pancreatic ducts of brasilian Primates, and can be differentiated mainly by the mensurations of the posterior extremities of the bodies. While the genus Rhabdochoma, parasite of the intestine of fresh-water fishes, underwent a very similar, but more or less pronounced, morphological evolution, it became adapted to many different hosts: Sea-fishes, Saurians, Mammals and to many locations. This evolutionary line includes six genera; Trichospirura, the only parasite in Mammals, is one of the more evolved. Some remarks are made on the host-distribution of Trichospirura, on the relationships between Rabdochonidae and Cystidicolidae and on the osmo-excretory apparatus of Trichospirura. The hypertrophy of this apparatus, which could be the consequence of the passage during the course of evolution from aquatic to terrestrial life, is comparable to that of the Pneumospirurinae.

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[Development in mosquitoes of 3 filaria of the South American lizards of the genus Oswaldofilaria].

The development of O. petersi, O. belemensis and O. spinosa is similar to that of O. bacillaris: the larvae are in the adipose tissue of various mosquitoes; the infective stages are characterized by the longitudinal salient ridges of the cuticule, the long tail ended by two lappets, the well-developed glandular oesophagus; the female genital anlage lies in the anterior half part of the body, but is not very far from the median line. This character opposes these species to the other viviparous Filariae and stresses the originality of the Oswaldofilariinar.

Adipose Tissue↗
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Helminths of birds and mammals of Israel. VIII.- Skrjabinocapillaria rodentium n. sp. (Nematoda Capillariidae) from gerbillid and murid rodents.

Skrjabinocapillaria rodentium n.sp., found in the stomach of Meriones crassus, Gerbillus pyramidum, G. gerbillus, G. dasyurus and Acomys cahirinus, is described. It differs from the other two species in the genus, S. bakeri and S. eubursata, mainly in being larger, having a larger number of stichocytes and having a cephalic influation in the female and not in the male.

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PubMedDate not supplied

[Study of gametocytes from the Plasmodium "vivax" group: morphology, development in Anopheles and infectivity of Plasmodium yoelii microgametocytes].

The study of the gametocytes of Plasmodium yoelii enabled the differentiation of 4 morphological types: O, I, II and III (in a chronological order) and amongst each of these types the differentiation of healthy and altered gametocytes. These morphological data represent a tool for investigations on the biology of the gametocytes of the "vivax" group. Preliminary experiments bring informations on the evolution of gametocytes and the mechanisms of their infectivity. 1--In experimentaly infected white mice gametocytes of P.y. nigeriensis are infective up to the 3rd-4th day, those of P. y. yoelii until the 5th-6th days. These periods can be shorter when the infection is very virulent or longer when chronical. 2--The drop in infectivity coincides with the increase in number of the altered gametocytes. 3--The loss of infectivity is connected with the condition of the blood: when parasitaemiae are high, it becomes rapidly unsuitable to a normal evolution of the gametocytes: thus, non infective gametocytes acquire a good infectivity in less than two hours when transfered to a clean mouse. 4--The gametocytic composition of the blood taken up by the Anopheles in the capillaries can be very different from that taken at the tail of a Rodent. In the young parasitaemiae, when the Rodents are most infective to the Mosquitoes, there is a considerable enrichment in gametocytes O-I of the blood ingested by the Anopheles as compared to that taken from the Rodents by the usual techniques. This phenomenon could perhaps be explained by the larger size of gametocytes O and I and their retention in the capillaries of the host. 5--The strong infectivity of gametocytes O and I is confirmed by the fact that no infection develops in the Mosquitoes when no such gametocytes are present in the ingested blood. 6--The ageeing of gametocytes appears to be very rapid for gametocytes arising from exo-erythrocytic schizontes reach stage II, 29 hours and stage III, 35 hours, after the rupture of the very first schizonts.

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PubMedDate not supplied

[Two filariae parasites of duikers in Gabon (author's transl)].

Description of the male fo Filaria cephalophi Chabaud and Rousselot, 1956 which was unknown. The species is a parasite of Cephalophus dorsalis in Congo and Gabon. Description of Dipetalonema (Loxodontofilaria) faini n. sp., parasite of Cephalophus nigrifrons. The species is closely related to the two Filariae known from Cattle in Ruanda.

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