Biomedical subjects

C Loubès

Publications and source records attributed to C Loubès.

6 recordsLinked to original sources

PubMed1997

Comparison between patterns of pinworm infection (Aspiculuris tetraptera) in wild and laboratory strains of mice, Mus musculus.

Sixteen laboratory and 7 wild-derived strains of mice were infected with the pinworm Aspiculuris tetraptera in order to compare their resistance levels estimated by the intestinal parasite loads. It appears that (i) in 4 strains out of 23, females and males harbour different parasite loads; (ii) wild and laboratory mice display a broad range of infection levels when compared independently; (iii) the laboratory strains are more resistant than the wild ones. We suggest that (i) compared to sex, the strain (i.e. genetic) effect is the main parameter which determines the levels of infection; (ii) resistance was selected in laboratory strains during their breeding because of the parasite pressure present in captivity.

Animals↗

PubMed1979

[Meiosis in Microsporidia: effects on biological cycles].

Synaptinemal complexes have been demonstrated in 7 microsporidian species belonging to 6 different genera (Gurleya, Thelohania, Pleistophora, Tuzetia, Baculea, Glugea). Thus, it can be presumed that a meiosis and consequently a karyogamy occur during their life cycle. Meisis occurs at the beginning of sporogony; therefore, karyogamy, must occur between spore and merogany, i.e. during the poorly known part of the life cycle. In the microsporidian species studied, with uninucleate spores and diplokaryotic merogony (Thelohania for instance), the 2 joined nuclei, each of them containing meiotic chromosomes, not only fail to fuse, but actually separate at the beginning of sporogony; afterwards, each of them undergoes meiosis. Their separation is accompanied by the appearance of an organelle whose structure and function are poorly understood. However, its structure resembles that of the kinetic center. The Nosema species studied do not have synaptinemal complexes; thus, their life cycle is difficult to understand: either karyogamy and meiosis occur during the unobserved part of the life-cycle, or sexual phanomena are absent altogether. In the latter case, the Nosema-type life cycle might be limited to vegetative multiplication which could be explained by the dimorphism theory of Microsporidia. It is shown also in the present study that the life cycle of Microsporidia does not involve haploid organisms which it might be thought to contain by comparing it with the cycles of sporozoa.

Apicomplexa↗

PubMed1978

[Simuliids larvae microsporidans: ultrastructural data (author's transl)].

This work is the summary of our present knowledge about the ultrastructure of Simuliids larvae Microsporidans, including several new data concerning: 1. Pleistophora simulii (Lutz et Splendore, 1904): reticulated or net-like plasmodial envelope, formation of pansporoblastic structures looking like short pipes. 2. Stempellia simulii Maurand et Manier, 1968: plasmodial envelope as Pleistophora simulii, granular-textured polaroplast. 3. Thelohania fibrata (Strickland, 1913): ultrastructural study of the sporogonic sequence nerve done so far. 4. Thelohania bracteata (Stickland, 1913): its relations with Thelohania minuta, T. canningi, Amblyospora bracteata, Pegmatheca simulii. 5. Tuzetia debaisieuxi (Jirovec, 1943): formation of pseudopansporoblasts by the host-cell membrane.

Animals↗

PubMed1976

[Presence of synaptonematic complexes in the biological cycle of Gurleya chironomi Loubes and Maurand, 1975: an argument in favor of sexuality in microsporidia].

Synaptonemal complexes are described in the prophasic nucleus of young pansporoblasts of Gurleya chironomi. Consequently the first mitosis of this nucleus might be a reductional one and sporogony a haploid phase in the life cycle of this Microsporidia.

Animals↗

PubMed1976

[Deveopment cycle and ultrastructure of Glugea habrodesmi n. sp., microsporidian parasite of Polydesmidae (Myriapoda, Diplopoda)].

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Arthropods↗

PubMed1976

[New species of Microsporidia, parasite of Myriapoda-Diplopoda of South Dahomey].

A new microsporidian parasitic in Myriapoda-Diplopoda of Sud-Dahomey (Habrodesmus falx Cook & Oxydesmus granulosus Palisot de Beauvois) is described by photonic microscopy. It can be recognized by its thick-enveloped pansporoblasts yielding from 30 to 66 elongate and ovoid spores measuring 4,8 mum in length and 2,2 mum in diameter. The spore is uninucleate. This microsporidian forms cysts in the anterior part of the host affecting the musculature of the digestive tract, the adipose tissue and segmentary muscles. However, it appears necessary to study this parasite again by means of electron microscopy for a better understanding of its life-cycle and in order to place it in the Microsporidian taxonomy.

Animals↗