Showing papers on "Bulinus truncatus published in 1980"

A comparative morphological and enzyme histochemical study on blood cells of the freshwater snails Lymnaea stagnalis, Biomphalaria glabrata, and Bulinus truncatus.

Abstract: The morphology and ultrastructure of the blood cells of the freshwater snails Lymnaea stagnalis, Biomphalaria glabrata, and Bulinus truncatus were studied. By performing in vitro experiments and enzyme histochemical studies, special attention was paid to the role of the blood cells in phagocytosis of foreign particles. No fundamental differences were found in the ultrastructure, lysosomal enzyme contents, and phagocytic capacities of the blood cells of these species. It is concluded that only one type of blood cell, the amoebocyte, exists in the freshwater snails. Amoebocytes constitute a morphologically and functionally heterogeneous population of cells, ranging from round (electron-dense) cells with the morphological characteristics of young cells to highly phagocytic spreading cells with a prominent lysosomal system. In addition to acid phosphatase, nonspecific esterase and peroxidase were found within the lysosomes. The presence of enzyme activity in the RER and the Golgi bodies indicates that amoebocytes are able to synthesize lysosomal enzymes continuously.

Histochemical studies of some enzymes in the tissues of the schistosome vector snail Bulinus truncatus (audouin) with special reference to the effects of a molluscicide. II. Hydrolases.

Abstract: Accomparative study of six hydrolases, acid and alkaline phosphatases, aryl sulphatase, β-gluchronidase cholinesterase, and non-specific esterase, was carried out on the tissues of normal healthy and Frescon-treatedBulinus. The presence and activity of these enzymes in the tissues of normal animals were taken to indicate the probale functions of the tissues concerned. Frescon administration caused inhibition of acid phosphatase and also induced the release of cholinesterase and non-specific esterase in some tissue. It is concluded that the most important effects of Frescon on snail physiology are the disorganization of neuronal function and disturbance of olfactory activity.

Interrelationship of molluscicidal concentration and temperature on the respiration of Bulinus truncatus

Abstract: The oxygen consumption of Bulinus truncatus subjected to two molluscicides was tested at different temperatures and different concentrations. The most effective combination for field application was discussed.

Aminergic systems in pulmonate gastropod molluscs

Abstract: Histochemical fluorescence (Falck-Hillarp) and microspectro-fluorometric (MSF) methods were used to characterize different types of catecholamine-containing cellular elements located in the reproductive system of fresh-water snails (Bulinus truncatus, Planorbarius corneus) and land snails [Archachatina marginata, Helix (Cryptomphalus) aspersa]. Transverse sections through the genital tract display a common structural pattern of tubular differentiations: (1) an internal epithelium bordering the lumen and containing variable numbers of monoaminergic cells; (2) an enveloping sheath of connective and muscular tissue containing fine nerve fibers in the form of a network that exhibits a variable degree of density. MSF determinations showed that the formaldehyde-induced fluorophores of the intraepithelial aminergic cells belong to the following classes: (1) the DOPA/dopamine group in the duct of the albumen gland of B. truncatus and the carrefour of A. marginata; and (2) the norepinephrine/epinephrine group in the duct of the albumen gland and in the oviduct sac of P. corneus. In the reproductive systems of B. truncatus and P. corneus (duct of the albumen gland, oviduct sac, vagina), A. marginata and H. aspersa (duct of the fertilization pocket, origin of the receptaculum seminis, carrefour), the MSF analysis revealed norepinephrine/epinephrine-containing intramural nerve fibers. On the other hand, the small neurons in the vagina of B. truncatus belong to the DOPA/dopamine group.

Role of the lateral lobes in the control of certain physiological and biochemical processes in Bulinus truncatus (Gastropoda, Pulmonata)

Abstract: 1. On the lateral side of each cerebral ganglion of Bulinus truncatus a small lobe, the lateral lobe (LL) is located. 2. Cauterization of the LL caused increase in the body growth, decrease in oviposition, decrease of the polysaccharide content of the organs and decrease of the carbohydrate and protein concentration of the blood. 3. Implantation of cerebral ganglia (+ LL) restored almost the normal values. 4. The effects of the hormone(s) of the LL on growth and reproduction and its correlation with carbohydrate and protein metabolism of snail are discussed.

Action competitive d'Helisoma duryi, wetherby (Planorbidae: Helisomatinae) a l'egard de divers mollusques vecteurs de trematodoses humaines et animales. II. Biomphalaria pfeifferi, krauss, Bulinus truncatus sericinus, jickeli et limnea natalensis, krauss

Abstract: The authors studied biological competition between some african snails (Biomphalaria pfeifferi, Bulinus truncatus sericinus, Limnea natalensis) and Helisoma duryi in the laboratory.