Results 101 to 110 of about 202 (147)

Magnetic Field Effects on the Compass Mechanism and Activity Level of the Snail Helisoma Duryi Endiscus

Journal of Genetic Psychology, 1967
(1967). Magnetic Field Effects on the Compass Mechanism and Activity Level of the Snail Helisoma Duryi Endiscus. The Journal of Genetic Psychology: Vol. 111, No. 1, pp. 85-102.
Willard E Caldwell, Willard E Caldwell
exaly   +3 more sources

Direct innervation of the mantle edge gland by neurosecretory axons in Helisoma duryi (Mollusca: Pulmonata)

Cell and Tissue Research, 1976
The mantle edge gland of Helisoma duryi is innervated by neurosecretory axons from the pallial nerves. Synaptoid contacts occur between axons and gland cells, and there is ultrastructural evidence for the release of neurosecretory material. The mantle edge gland contributes to the deposition of periostracum during shell formation, and direct ...
A S M Saleuddin
exaly   +3 more sources

The role of calcium on protein secretion of the albumen gland inHelisoma duryi(Gastropoda)

Invertebrate Biology, 2004
Abstract.The albumen gland of the freshwater pulmonate snailHelisoma duryiproduces and secretes the perivitelline fluid, which coats fertilized eggs and provides nutrients to the developing embryos. It is known that perivitelline fluid secretion is stimulated by dopamine through the activation of a dopamine D1‐like receptor, which in turn stimulates ...
Lana Kiehn, Spencer T. Mukai, A. Saber M. Saleuddin   +2 more
openaire   +2 more sources

Biological, biochemical, and molecular parameters of Helisoma duryi snails exposed to the pesticides Malathion and Deltamethrin

Pesticide Biochemistry and Physiology, 2011
Abstract Aquatic environments get contaminated with pesticides residues that result from the application of pesticides in agricultural practices. The present study aimed to evaluate the pesticides Malathion and Deltamethrin on biological and biochemical parameters of Helisoma duryi snails.
Fayez A. Bakry, Wafaa S. Hasheesh, Salwa A.H. Hamdi   +2 more
openaire   +2 more sources

Hormonal Control of Confirmed Shell Growth in the Snail Helisoma duryi (Mollusca: Gastropoda)

, 1991
Many molluscs grow by a regular or irregular incremental growth of the shell margin. The shell growth is influenced by photoperiod, lunar cycle, temperature, salinity and other environmental conditions. For example, Helisoma durvi, a basommatophoran pulmonate, grow significantly faster in 00L:24D photoperiod than in 12L:12D photo-period.
A. S. M. Saleuddin, H. R. Khan, M. Sevala, V. Sevala   +3 more
openaire   +2 more sources

Activities of glutamate dehydrogenase and aspartate and alanine aminotransferases in freshwater snailsHelisoma duryiandLymnaea natalensisexposed to copper

Biomarkers, 2003
In this paper we investigate the potential of glutamate dehydrogenase (GDH) and aspartate and alanine aminotransferases (AST and ALT) as biomarkers of water pollution due to copper in the freshwater snails Helisoma duryi and Lymnaea natalensis.
Y S Naik, Everson Kandare
exaly   +3 more sources

A review of "Helisoma duryi" in biological control

Acta tropica, 1979
Biological control of schistosomiasis by means of introduction of the north American planorbid snail, Helisoma duryi, as a competitor of the intermediate host snails has been proposed. The systematics of the genus Helisoma and the geographic distribution of the different species is described.
F, Frandsen, H, Madsen
openaire   +2 more sources

Regulation of shell growth in the pulmonate gastropod Helisoma duryi

Canadian Journal of Zoology, 1978
Photoperiod has a significant effect on linear shell deposition rates; animals maintained in continuous darkness (DD) deposit shell more rapidly than those held in continuous light (LL) or 12L: 12D. Shell deposition is endogenously governed and might be synchronized by photoperiod.
S. C. Kunigelis, A. S. M. Saleuddin
  +4 more sources

Fine structure of normal and regenerated shell of Helisoma duryi duryi

Canadian Journal of Zoology, 1972
The fine structure of the normal and the regenerated shell of Helisoma duryi duryi has been studied by transmission and scanning electron microscopy. Normal shell consists of two calcareous layers: outer prismatic and inner cross lamellar. A typical myostracal layer which shows prismatic structure is also present only at or near muscle insertions ...
Veronica Wong, A. S. M. Saleuddin
openaire   +1 more source

Acid phosphatase in the mantle of the shell-regenerating snailHelisoma duryi duryi

Calcified Tissue Research, 1974
Acid phosphatase activity was mainly localized in the lysosomes in all the regions of the outer epithelium. The transitional portion of the outer epithelium showed more intense activity than the other regions. During shell regeneration the activity of this portion decreased to a minimum level at 12 hours and was restored to normal at 72 hours.
J F, Chan, A S, Saleuddin
openaire   +2 more sources