منابع مشابه
The organization of the muscular system of Metridium senile.
I . The muscular system of Metridium consists of fields of relatively short musclefibres. In extension these may exceed i mm. in length but are only about 0-5/* thick. They can shorten to about a fifth of the extended length. The fibres consist almost entirely of densely staining material. They form a connected network. At least in some cases the cells seem to be in contact rather than to form ...
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An attempt has been made to identify electrical correlates of behaviour in Metridium senile (L.), a sea-anemone whose neuromuscular physiology and structure are already familiar (Parker, 1919; Hall &Pantin, 1937; Batham &Pantin, 1950a,b,c; 1951; 1954; Pantin, 1952, 19656; Batham, Pantin & Robson, i960; Robson, 1961; Ross, 19600,6). In a recent paper Josephson (1966) described electrical potenti...
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cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...
romantic education:reading william wordsworths the prelude in the light of the history of ideas
عصر روشنگری زمان شکل گیری ایده های مدرن تربیتی- آموزشی بود اما تاکید بیش از اندازه ی دوشاخه مهم فلسفی زمان یعنی عقل گرایی و حس گرایی بر دقت و وضوح، انسان عصر روشنگری را نسبت به دیگر تواناییهایش نابینا کرده و موجب به وجود آمدن افرادی تک بعدی شد که افتخارعقلانیتشان، تاکید شان بر تجربه فردی، به مبارزه طلبیدن منطق نیاکانشان وافسون زدایی شان از دنیا وتمام آنچه با حواس پنجگانه قابل درک نبوده و یا در ...
Nanosecond-scale kinetics of nematocyst discharge
dispersed genes in different lineages. First, the cluster may have been broken up in organisms with elevated rates of genome evolution, such as C. intestinalis, C. elegans and Drosophila melanogaster. This implies that cluster integrity in other lineages may not be due to selection. Conversely, clusters may have been maintained in some lineages due to selection. This would imply a relaxation of...
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ژورنال
عنوان ژورنال: The Biological Bulletin
سال: 1971
ISSN: 0006-3185,1939-8697
DOI: 10.2307/1540276