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C Gabrion

Publications and source records attributed to C Gabrion.

At least 37 records · Page 2Linked to original sources
PubMed1988

The effect of isatin on the Echinococcus granulosus cyst in an experimental host.

The effect of isatin on the E. granulosus cyst was studied. NMRI mice, which were infected with E. granulosus of sheep origin, were treated daily with isatin at a dose of 50 mg kg-1 for 18 days. Ultrastructural damage was observed in the treated cysts, including accumulation of lamellar stacks, electron-dense granules, autophagosomes and lipid vesicles. Moreover, a biochemical study showed an inhibition of alkaline phosphatase activity, with a decrease in carbohydrate storage and an increase in acid phosphatase activity. In spite of the short duration of the treatment, the results obtained allowed us to conclude that isatin acts on E. granulosus cysts. This activity appears as a process of degeneration linked to the alkaline phosphatase inhibitory effect of isatin.

Acid Phosphatase↗
PubMed1988

Speciation of cestoda. Evidence for two sibling species in the complex Bothrimonus nylandicus (Schneider 1902) (Cestoda: Cyathocephalidea).

Using biochemical genetic methods, we have distinguished 2 sibling species in the complex Bothrimonus nylandicus (Schneider, 1902), which infest 2 congeneric species of sole (Solea lascaris and Solea impar) on European coasts (Atlantic and Mediterranean). Neither of the parasite species is specific for either of the sole species, but one of them is present all year round, whereas the other is absent in the autumn and winter and only appears in the spring, subsequently disappearing at the end of the summer. Only S. impar lives in the Mediterranean, and is equally infested by both cestodes, whereas both species occur in the Atlantic and each of them is preferentially infested by 1 species of cestode. The shortness of the adult stage of the parasite in the definitive host and the presence of 2 life-cycles associated with competition between the 2 hosts in the Atlantic could be responsible for the biological differences observed and for maintaining the sibling species in sympatry.

Animals↗
PubMed1988

Characterization of two species of Lepeophtheirus (Copepoda, Caligidae) from flatfishes. Description of Lepeophtheirus europaensis sp. nov.

In the eastern Mediterranean, the copepod Lepeophtheirus thompsoni Baird, 1850, has been reported to infest turbot, brill and flounder. By combining several methods, including enzyme electrophoresis, we show that this species is found only in turbot. By contrast, brill and flounder are infested by a species of Lepeophtheirus that corresponds to no other species reported in the literature. We propose that the species be designated as L. europaensis and we describe the characteristics of the gravid female. This study was extended to the Atlantic populations of flatfishes and includes an investigation of L. pectoralis (Muller, 1776), which infects flounder in the North Sea; we also confirmed the presence of L. thompsoni (Baird, 1850) over the whole geographic range of turbot. Lastly, we discuss the specificity and distribution of these species along the European coasts.

Alleles↗
PubMed1988

[Characterization of surface and intracellular glycoconjugates in larval forms of Echinococcus multilocularis using lectins].

Carbohydrate moieties have been detected with nine fluorescent lectins in Echinococcus multilocularis cysts, developed in liver and lung of infested jirds. Tegument and glycocalyx, and two types of medullary cells were found to selectively and strongly bind lectins which are specifically adsorbed by N acetyl glucosamine, N acetyl galactosamine, galactose or mannose. The significance of these features in the host-parasite interaction are discussed.

Animals↗
PubMed1987

The concept of specificity in the procercoid-copepod system: Bothriocephalus claviceps (Cestoda) a parasite of the eel (Anguilla anguilla).

This paper describes experimental work on parasite specificity in the copepod-procercoid system of Bothriocephalus claviceps. Two criteria were used to characterize five potential host species Macrocyclops albidus, Macrocyclops fuscus, Eucyclops serrulatus, Acanthocyclops robustus and Macrocyclops viridis viridis. The first criterion involves susceptibility of the copepods to infection. The results show random or aggregative distributions and variable susceptibilities according to the species. We observed an ethological barrier to infection in M. viridis viridis and M. fuscus. The second criterion involves the growth and development of the procercoid. Three factors modify the profiles of the growth curves: host species, sex and intensity of infection. The growth of the procercoids is density-dependent, whereas their development is independent of density. This last characteristic is interpreted as a factor favouring the aggregation of procercoid populations. The two most susceptible hosts are M. albidus and A. robustus.

Anguilla↗
PubMed1986

[Experimental approach to the role of the paratenic host in the circulation of the parasite Bothriocephalus claviceps Goeze, 1782 (Cestoda, Pseudophyllidea)].

This article concerns an experimental work monitored in 5 species of fishes in the order to evaluate their value of paratenic hosts, in the cycle of Bothriocephalus claviceps, a parasite of the eel, Anguilla anguilla. The intestinal localisation and the lack of development of parasites are the two principal characters of this parasitism. The second character is sometimes contradicted. The effective evolution has been observed during 20 days. The more important losses of parasites coincide with the invasion of fishes. After that stage, the decrease of effectives is slower. The authors are led to consider that two modes of circulation are required for the parasite: the direct transmission and the transmission with intercalation of paratenic hosts.

Anguilla↗
PubMed1984

[The Bothriocephalus scorpii complex (Mueller, 1776). Differentiation of species of parasites of the turbot (Psetta maxima) and the brill (Scophthalmus rhombus). Study of protein fractions and antigen complexes].

Previous electrophoretic studies (Renaud et al., 1983) carried out on the Cestode Bothriocephalus scorpii (Mueller, 1776) showed that the populations parasiting the Turbot and the Brill on the Mediterranean coast, are two distinct species: Bothriocephalus (supra sp. scorpii) gregarius and Bothricephalus (supra sp. scorpii) barbatus respectively. This work has been done with the purpose of identifying these two species by using biochemical tests. The study of whole body proteins by electrophoresis of zones of acrylamide gel shows the existence of nineteen distinct protein fractions in both populations. Among those different protein fractions, two of them (Rf 53 and Rf 87) are present only in the Cestode of the Brill and one (Rf 42) seems to be specific of the Turbot. On the other hand, the fraction of Rf 27 is present only in the Cestodes of the Brill. The immunoelectrophoretic study of antigenic components shows seven or eight major fractions depending on the source of protein, five of them being common to both. The reactions of absorption of antiserum permitted characterization of three arcs of precipitation proper in the Cestodes of the Brill corresponding to protein fractions of Rf (27, 53, 87) and three arcs in the Cestodes of the Turbot, corresponding to protein fractions of Rf (42, 21, 66).

Animals↗
PubMed1982

[Larval development of Paricterotaenia porosa (Cestoda: Cyclophyllidea, Dilepididae) in dipterans of the genus Chironomus, experimental hosts. On comparative larval forms of dilepidid flatworms (author's transl)].

The authors describe the larval evolution of Paricterotaenia porosa (Rud., 1810) Fuhrmann (1932) (Cestoda: Cyclophyllidea, Dilepididae) in three species belonging to the genus Chironomus (Diptera, Nematocera) used as experimental hosts. The protoscolex of the infestant larva is retracted into a cystic vesicule, the cysticercoïd is surrounded by a fragmented cercomer and a capsule. P. porosa in contrary to P. paradoxa (Rud., 1802) do not present asexual reproduction in its intermediate host. P. porosa and Anomotaenia constricta (Molin, 1858) Cohn (1900) show a similar evolution, though the cercomer appears sooner in the former. These cysticercoïds are regarded as Monocercus Villot (1883) the characteristics of which are given. The Monocercus is specific to the Dilepididae. The other larval types described in this family i.e. Cercoscolex and Plerocercus (Jackera, 1970) Plerocercoïd (Freeman, 1973) ans Strobilo cysticercoïd (Freeman, 1973) are compared to the larva of other families: Proteocephalidae, Mesocestoididae and Amabiliidae respectively.

Animals↗
PubMedDate not supplied

[Simultaneous presence of a Cestode cysticercoid (Cyclophyllidae, Hymenolepididae) and a Trematode metacercaria (Dicrocoeliidae) in Oxydesmus granulosus Palisot de Beauvoir (Myriapoda, Diplopoda, Polydesmidae) from Dahomey].

We report observations of cysticercoids of Hymenolepis gilloni (Hunkeler, 1972), a flatworm parasite of five species of Crocidura in Africa. The cysticercoids are found up against the outside of the gut of Myriapode, Oxydesmus granulosus, from Porto Novo (Dahomey). We also found the metacercaria of a Trematode which is probably a Dicrocoeliidae.

Animals↗
PubMedDate not supplied

[Anomotaenia brevis (Clerc, 1902) Fuhrmann, 1908, Cestoda Cyclophyllidae, parasite of Leptothorax nylanderi (Forster), Hymenopterous, Formicidae (author's transl)].

Cysticercoids recovered from hemocoele of the ant Letothorax nylanderi are examinated by light and electron microscopy. This examination proves that the Cestode is a Dilepididae. The structure of the cysticercoids is the same that another Dilepididae, Anomotaenia constricta. The cysticercoids observed are those of A. brevis, parasite of three species of birds, Dendrocopos major, D. minor and Garrulus infaustus. The contamination of L. nylanderi by A. brevis occurs before metamorphosis of the Ant. The adults of L. nylanderi infested by A. brevis cysticercoids are morphologically different from the others; their physiology and behaviour are also different. The mechanisms of the parasitic action on the larval stages of L. nylanderi are discussed.

Animals↗
PubMedDate not supplied

[A study on the tegument and sensory receptors of the scolex of a tetraphyllidean cestode plerocercoid, by transmission and scanning electron microscopy (author's transl)].

The ultrastructure of bothridia and the myzorhynchus of a tetraphyllidean cestode plerocercoid is described. Two types of microtriches occur on the tegument of these organs. On the bothridium, the microtriches are lanceolated whereas on the mizorhynchus, they are filamentous. Uniciliated sensory receptors, which consist of a basal bulb contaning one or two electron-dense collars, are observed especially on the bothridia and myzorhynchus. A papilla is also described on the tegument. According to the present study, it is suggested that the rostellum of cyclophyllidean cestodes and the myzorhynchus of the tetraphyllideans are homologous. Moreover, the role in the attachment and sensory perception of the myzorhynchus is revealed.

Animals↗
PubMedDate not supplied

[On the ultrastructure of the cysticercoid of Hymenolepis stylosa (Cestoda: Cyclophyllidea) (author's transl)].

Electron microscopy of the tegument of H. stylosa cysticercoid as compared with that of H. diminuta reveals great variations in the fine structure of the larval tegument of these two species. On the scolex and the inner cyst wall, the tegument of H. stylosa cysticercoid bears typical microtriches; at the level of the anterior pore, the microtriches are flexuous. The tegument of the outer cyst wall appears as a syncytial band with dense material which accumulates in the region below the unit membrane, and the tegument of the cercomer is increased by branchied microvillies. While, the scolex of H. diminuta cysticercoid is unarmed and the tegument of the outer cyst wall bears branched microvillies. The data permit the conclusion that the differentiation of tegumental structures is graduated from the scolex to the cercomer. This differenciation is more or less important according to the parasite and results of successive inductions which affect parts of the cysticercoid. The significance of these findings is discussed in terms of the possible function of these structures and the penetration of substances.

Animals↗
PubMedDate not supplied

[Artemia sp. (Crustacea, Anostracea) as intermediate host of Eurycestus avoceti Clark, 1954 (Cestoda, Cyclophyllidea) (author's transl)].

Examination of Artemia sp. (Crustacé, Anostracé) for natural infection by cysticercoids of Flamingolepis liguloides, Cestode of the Flamingo (Phoenicopterus ruber) shows the presence of three other cysticercoids of cestode parasites of the Flamingo in the hemocoele of the Branchiopode. A fourth one is reported as the cysticercoid of Eurycestus avoceti, Clark, 1954, which parasitizes the Avocet (Recurvirostra avosetta). The systematic position of this Cestode is always unknown. This report shows the importance of Artemia in the life cycle of Cestodes of Anseriforms and Charadriiforms birds in saline lagoons.

Animals↗
PubMedDate not supplied

[Experimental study of the larval development of Hymenolepis stylosa (Rudolphi, 1809), Raillet, 1899 (Cestoda : cyelophyllidea) (author's transl)].

Comparative studies of the larval development of Hymenolepis stylosa Rudolphi, 1809 (Cestoda : Cyclophyllidea), a parasite of Corvid birds are undertaken from three insect species. The development in the beetle, Tenebrio molitor shows that the scolex differenciation occurs before the invagination of the metacestode in the cystic vesicle. The cercomer is long, narrow and flexuous. In the grasshopper, Lousta migratoria, the development is the same one but the scolex invaganation begins early. In another beetle, Dermestes frischi, the oncosphere is stopped in the gut-wall. The morphology and development of the cysticercoids of avian species of Hymenolepis, which have a well known life cycle, are similar. Studies on the structure of the larval stages of avian and mammal species of Hymenolepis seem necessary to find the relations between the different species of this genus.

Animals↗