| excystment in vitro of cotylurus cornutus (trematoda: strigeidae) metacercariae. | an acid-medium pretreatment appeared to be essential for in vitro excystation of cotylurus cornutus metacercarial cysts. both acid-pepsin or acid-saline were effective but optimum excystation occurred after 15 min acid-pepsin pretreatment and subsequent 2 hr treatment at 41.5 c in an alkaline bile salt-trypsin medium. the rate of excystation was rapid, reaching 78.1% by 1 hr and increasing to 84.3% after 2 hr. storage of metacercarial cysts up to 16 wk at 4 c in sterile locke's 1:1 solution did ... | 1993 | 8501606 |
| temporal variation in prevalence and abundance of metacercariae in the pulmonate snail lymnaea stagnalis in chany lake, west siberia, russia: long-term patterns and environmental covariates. | infrapopulations of trematode metacercariae were monitored in the snail lymnaea stagnalis over 17 yr (1982-1999) at chany lake, novosibirskaya oblast', russia. eighteen trematode species were recorded. patterns of occurrence varied from 4 species (echinoparyphium aconiatum, echinoparyphium recurvatum, moliniella anceps, and cotylurus cornutus) that persisted at relatively high prevalence (> 60% of samples) across sites, seasons, and years, to species that were very rare and sporadic in occurrenc ... | 2006 | 16729680 |
| taxonomic structure of digenea in wild ducks (anatinae) from west pomerania. | parasitic fauna of birds connected with water environment, including digeneans, is relatively well researched in poland. the exception, however, is west pomerania, where those birds were not frequent objects of parasitological research until recently. the purpose of this work is to determine the taxonomic structure of the digenea, parasitising wild ducks living in west pomerania. the research material was 124 individuals of wild anatinae (anseriformes) belonging to 8 species: anas strepera, a. c ... | 2008 | 18702318 |
| larval stages of trematodes in gastropods from lake chicnahuapan, state of mexico, mexico. | during the period from january to december (2007), 1,095 freshwater molluscs of four species were captured (lymnaea stagnalis, stagnicola elodes, physella cubensis and physa acuta) in lake chicnahuapan, state of mexico, mexico. two hundred seventy-two (24.84% prevalence) of these molluscs were parasitised by 11 trematode species (from which two were not identified at the species level) having six cercariae species and five metacercariae species represented in five families. the cercariae telorch ... | 2009 | 19568770 |
| a cysteine proteinase in the penetration glands of the cercariae of cotylurus cornutus (trematoda, strigeidae). | a cysteine proteinase from the penetration glands of cotylurus cornutus cercariae was examined with histochemical and biochemical methods. the enzyme hydrolyzed gelatin, azocoll, azocasein, azoalbumin, n-blocked-l-arginine-4-methoxy-2-naphthylamide, and n-blocked-p-nitroanilide, but did not degrade elastin. the metal ion complexane ethylenediamine tetraacetate and the thiol-reducing compound dithioerythritol enhanced the proteinase activity, whereas the thiol-blocking compounds p-hydroxymercurib ... | 2010 | 20981445 |
| [effect of nitroammofoska on the aldolase activity of the normal hemolymph in the mollusk planorbarius banaticus and in trematode invasion]. | the infection of planorbarius banaticus with sporocysts of cotylurus cornutus is accompanied by an increase in aldolase activity of molluscs' haemolymph of 1.2 fold. in solutions of nitroammofoska (0.1, 1 and 10 mg/1) the activity of this ferment in infected individuals increases much higher than in non-infected ones. this results in fast carbohydrate expenditures by molluscs, intermediate hosts of trematodes, and their death from exhaustion. | 1988 | 2852346 |
| [changes in the sulfhydryl group content in the hemolymph of freshwater gastropods infected with trematode parthenitae and larvae]. | a study was conducted on the changes in sulphhydryl groups in the haemolymph of lymnaea stagnalis infected with partenites of opisthioglyphe ranae, planorbis corneus infected with partenites of cotylurus cornutus and females of viviparus viviparus infected with partenites and larvae of echinoparyphium petrowi. at the infection in the haemolymph of hosts were recorded statystically reliable changes in the protein sulphhydryl groups which are blocked by toxines excreted by the parasites. the reduc ... | 1978 | 622300 |
| [heat resistance of the cercariae of serveral species of trematodes]. | cercariae of echinostoma sp., cotylurus cornutus, cercaria c szidat, marites of which parasitize homeothermic hosts (birds), were found to have a high heat resistance at the effect of lethal temperature. there were established specific differences in the temperature level and its stability during a long period at a relatively constant environmental temperature. thé heat resistance of cercariae of the same species does not change during their parasitism in different species of mollusks, hosts (e. ... | 1977 | 865867 |