منابع مشابه
Molluscs
Figure 1. The ‘Kraken’ myth. Ancient tales repeatedly reported octopod-like sea-monsters attacking sea vessels. Indeed, octopuses may reach a maximum of 3 m body size, but the foundation of these ancient tales is based on giant squids (with ten rather than eight arms as depicted here) defending itself against its main predator, a sperm whale, rather than octopuses. Squids are known to leave suc...
متن کاملIncidence of Larval Trematodes Infection and Their Seasonal Variations in the Fresh Water Molluscs of Southern · Rajasthan
Dubois (1929), Rees (1932), Wesenburg-Lund (1934), Rothschild (1941), Wikgren (1956), Deforest (1957), Khan (1960a, b), Radke et all (1961), Larson (1961), Ewers (1964) and Basch (1966) have studied the larval trematodes infecting the different molluscan hosts. The seasonal variations of infection of larval trematodes in India have been studied by Soparkar (1921) Sewell (1922), Chatterji . (193...
متن کاملLysozymes in molluscs
Invertebrates lack antibody-mediated humoral immune systems; however, they are believed to possess efficient host defense mechanisms involving humoral defense molecules that are similar in function to antibodies. Lysozymes are a group of enzymes that cleave the glycosidic bonds between N-acetylmuramic acid and N-acetylglucosamine (two amino sugars) in the peptidoglycans that form bacterial cell...
متن کاملPerkinsosis in molluscs: A review
The genus Perkinsus includes protistan parasites infecting marine molluscs throughout the world, some of which are associated with mass mortalities. Life cycle involves vegetative proliferation within the host, by which a cell named trophozoite undergoes successive bipartitioning. Other stages have been observed in vitro or in vivo, depending on the species: hypnospore, zoosporangium and zoospo...
متن کاملFish-borne Trematodes in Vietnam
From 1976 to 2000, over 30,000 human stool samples from 38 communes in 15 provinces were examined. The average infection rate of Clonorchis and Opisthorchis in the provinces examined was 21%. In these provinces, the infection rates were distributed as follows: 0.6% in Ha Giang, 0.2% in Thai Binh, 16.3% in Bac Giang, 13.1% in Hai Phong, 5% in Hoa Binh, 16% in Ha Tay, 3-37.5% in Nam Dinh, 3% in H...
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ژورنال
عنوان ژورنال: Nature
سال: 1972
ISSN: 0028-0836,1476-4687
DOI: 10.1038/237521c0