Results 181 to 190 of about 129,760 (220)

“Central arousal” and sexual responsiveness in the snail, Helix aspersa

Behavioral and Neural Biology, 1991
In 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.
S A, Adamo, R, Chase
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Studies on eye regeneration in a snail, Helix aspersa

Journal of Experimental Zoology, 1973
AbstractPart 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 ...
R M, Eakin, M M, Ferlatte
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Snail mucus − glandular origin and composition in Helix pomatia

Zoology, 2017
Apart from their well-known culinary use, gastropod species such as Helix, which have a hydrogel-like mucus, are increasingly being exploited for cosmetic, bioengineering and medical applications. However, not only are the origin and composition of these "sticky" secretions far from being fully characterized, the number and morphology of the mucus ...
Greistorfer, Sophie, Klepal, Waltraud, Cyran, Norbert, Gugumuck, Andreas, Rudoll, Livia, Suppan, Johannes, von Byern, Janek   +6 more
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Repair of a Defect in the Shell of the Snail Helix aspersa

The Journal of Bone & Joint Surgery, 1957
Findings 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.
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Neuroendocrine complexes in the gut of the snail Helix aspersa

Journal of Morphology, 1989
AbstractTo our knowledge, this paper presents the first description of neuroendocrine complexes in invertebrates. Neuroendocrine complexes have been identified in the lamina propria of the snail gut by light microscopy using Giemsa‐stained, deplasticized sections and by electron microscopy.
Y, Alba, A C, Villaro, P, Sesma, J J, Vázquez   +3 more
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Procedure of intracellular staining of neurons in the snail Helix pomatia

Journal of Neuroscience Methods, 1982
Abstract A method is described for cobalt staining of single neurons. It is based on already-known procedures, particulary on the use of a cobalt lysine complex and of a silver-intensified whole-mount preparation. These methods are modified and adapted to neurons of the buccal ganglion of the snail Helix pomatia .
U, Altrup, M, Peters
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Transport of pinocytic vesicles in the eye of a snail, Helix aspersa

Cell and Tissue Research, 1983
The heads of small adult snails, Helix aspersa, were injected with horseradish peroxidase (HRP) for one to five hours before extirpating the eyes and preparing them cytochemically for electron microscopy. There was internalization of tracer by pinocytic vesicles (pinosomes) at the bases of types-I and -II sensory cells, ganglion cells and, in lesser ...
J L, Brandenburger, R M, Eakin
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Toxic effects of cadmium on the garden snail (Helix aspersa)

Bulletin of Environmental Contamination and Toxicology, 1981
Spreading treated municipal wastes on agricultural and forest lands is becoming an established method of disposal. However, there is concern about the deleterious effects of toxicants, particularly cadmium, in the sludges. Cadmium concentrations in sewage sludge have been reported as high as 1500 ppM.
L K, Russell, J I, DeHaven, R P, Botts
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Structural studies on the galactan from the snail Helix pomatia

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 1990
1. 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.
U, Knels, H, Bretting
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The effect of cytisine on the activity of neurons of the snail, Helix aspersa

Comparative and General Pharmacology, 1970
Abstract 1. 1. A comparison has been made between the actions of cytisine and nicotine on ( a ) neuron activity and ( b ) the action of iontophoretically applied acetylcholine to neurons of Helix aspersa . 2. 2. Cytisine mimics the action of nicotine on cells that are hyperpolarized by acetylcholine (H cells) and cells that are depolarized ...
R J, Walker, G N, Woodruff
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