Results 191 to 200 of about 6,972 (211)
Some of the next articles are maybe not open access.
Studies on eye regeneration in a snail, Helix aspersa
Journal of Experimental Zoology, 1973AbstractPart I is a study of the fine structure of the regenerating optic tentacle of a pulmonate snail, Helix aspersa. Electron microscopy demonstrates marked similarity between regeneration and embryonic development of the eye and its photoreceptoral microvilli, lens‐forming secretory droplets, clear photic vesicles, neurites, pigment granules, and ...
Richard M. Eakin, Millie Miller Ferlatte
openaire +3 more sources
Buffers in the blood of the snail,helix pomatia L.
Comparative Biochemistry and Physiology, 1969Abstract 1. 1. Blood from the haemocoels of active snails had an average pH of 7·76. In aestivating snails, it tended to contain less bicarbonate to have a higher pCO2, so being more acid (mean: pH 7·51). 2. 2. Blood from the heart was 0·12 pH units more alkaline. 3. 3. The pH of maximum buffering by haemocyanin is lowered in the presence
openaire +3 more sources
Repair of a Defect in the Shell of the Snail Helix aspersa
The Journal of Bone & Joint Surgery, 1957Findings of this study of the repair of a shell defect in the snail Helix aspersa are as follows: 1. The defect is filled by a glycoprotein matrix. 2. The mantle epithelial cells show changes which indicate that these cells secrete the glycoprotein matrix. 3. The matrix contains no demonstrable reticular fibers and few cells.
openaire +3 more sources
“Central arousal” and sexual responsiveness in the snail, Helix aspersa
Behavioral and Neural Biology, 1991In molluscs, a "central arousal" system is thought to positively modulate both an animal's level of activity and its behavioral responsiveness. This hypothesis is examined in Helix aspersa by testing the relationships between activity, feeding, and sexual behavior. Activity, feeding, and mating exhibit parallel daily rhythms.
Shelley A. Adamo, Ronald Chase
openaire +2 more sources
Chitin Content of the Mandible of the Snail (Helix pomatia)
Nature, 1939THE presence of chitin in the above-mentioned organ has been indicated so far by means of colour reactions only, probably owing to the laek of material. During the course of another investigation, we came into the possession of 650 mandibles (1 gm.), and an acetolytic breakdown experiment was carried out.
G. Tóth, L. Zechmeister
openaire +2 more sources
Studies on Calcium in the Eye of the Snail Helix Asiersa
Proceedings, annual meeting, Electron Microscopy Society of America, 1980We have given much attention to unique microvesicles (uniform spherical shape and uniform 800 A diameter) that occur in remarkable aggregations in the photosensory cells of gastropod mollusk eyes (Fig. 1).
Richard M. Eakin, Jean L. Brandenburger
openaire +2 more sources
Intranuclear elements in the Leydig cell of the snail Helix
Canadian Journal of Zoology, 1970The presence of glycogen granules and a paracrystalline structure has been reported in the nucleus of the Leydig cell of Helix.
openaire +3 more sources
Tyrosine hydroxylase in snail (Helix pomatia) nervous tissue
Biochemical Pharmacology, 1976Abstract Snail nervous tissue synthesizes [14]dopamine and [14]dihydroxyphenylalanine (DOPA) from [14C]tyrosine. The Km value for the overall conversion of [14C]dopamine was 6 × 10−4M. The enzyme converting [14C]tyrosine to [14C]DOPA. tyrosine hydroxylase, has the following characteristics.
N.N. Osbornf, P.B. Guthrie, V. Neuhoff
openaire +3 more sources
Structural studies on the galactan from the snail Helix pomatia
Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 19901. The galactan of the snail Helix pomatia was subjected to two cycles of Smith-degradation and the resulting products were isolated by gel filtration and thin layer chromatography. 2. The structures of the low molecular weight oligosaccharides were elucidated being identical to those obtained from Lymnaea stagnalis galactan.
Hagen Bretting, Ulrike Knels
openaire +2 more sources