نتایج جستجو برای: snail shell
تعداد نتایج: 59827 فیلتر نتایج به سال:
abstract collection and identification snails of dez river in khuzestan province in iran has been investigated in 2012-2013. for the first time, 29 snail species are identified in dez river in khuzestan, which they belong to 15 genera from 10 families identification was done according to morphometric characters including shape, size of shell, dextral and sinistral position of the shell, opercul...
This research investigates the effects of snail shell-based hydroxyapatite (HAp) reinforcements on mechanical, wear, and selected physical properties epoxy-based composites. The exploitation these was aimed at assessing suitability efficiency developed bio-composites for adhesive biomedical applications. Snail shell wastes were sourced processed to obtain particles ˂20 μm. bio-derived hydroxyap...
In the Lake Tanganyika cichlid Lamprologus callipterus, males were >12 times heavier than females, the most extreme sexual size dimorphism in this direction among animals. L. callipterus males construct nests of empty snail shells in which the females breed. If the ancestors of L. callipterus were small cichlids, both sexes may have used shells for shelter. If the ancestors were larger, snail s...
Potential of Date-Seed/Snail Shells as a Carburizer for Enhanced Mechanical Properties of Mild-Steel
The suitability of date-seed/snail shells as a carburizer for enhanced mechanical properties mild-steel using the packed carburization technique was investigated in this work. Standard tensile, impact and hardness test samples prepared from were subjected to pack-carburization process mixtures date-seed snail shell ratio 60:40 respectively at 800, 900, 1 000 °C 3 hours. carburized quenched wate...
Manganese is one of the most abundant metal in natural environments and serves as an essential microelement for all living systems. However, the enrichment of soil with manganese resulting from industrial inputs may threaten terrestrial ecosystems. Several studies have demonstrated harmful effects of manganese exposure by cutaneous contact and/or by soil ingestion to a wide range of soil invert...
Abstract This study presents the results of observation on growth and reproduction Planorbarius corneus (Linnaeus, 1758) (Gastropoda, Pulmonata) over course several years continuous rearing in laboratory order to use them as test organisms for toxicity testing chemicals. Some features (shell diameter increase, fecundity, hatching time rate, age at first reproduction, juvenile survival), which c...
A convenient, simple and green process for the synthesis of 2,4,5-triaryl-1H-imidazole and 1,2,4,5-tetraaryl-1H-imidazole derivatives using snail shell, which is abundant in Morocco, as a catalyst in ethanol at 40 °C has been developed. Additionally, short reaction times, excellent yields, simple procedure and relative non-toxicity of the catalyst are other noteworthy advantages and make this m...
A convenient, simple and green process for the synthesis of 2,4,5-triaryl-1H-imidazole and 1,2,4,5-tetraaryl-1H-imidazole derivatives using snail shell, which is abundant in Morocco, as a catalyst in ethanol at 40 °C has been developed. Additionally, short reaction times, excellent yields, simple procedure and relative non-toxicity of the catalyst are other noteworthy advantages and make this m...
Gastropod shells are important antipredator structures that vary morphologically in response to predation risk, often increasing in thickness when the risk of predation is greater. Because the shell is composed of different microstructures that vary in energetic cost and strength, shell thickness may be increased in different ways. We tested whether the common intertidal snail Nucella lapillus ...
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