نتایج جستجو برای: cercariae

تعداد نتایج: 862  

Journal: :Ecological applications : a publication of the Ecological Society of America 2008
Jason R Rohr Thomas R Raffel Stanley K Sessions Peter J Hudson

Anthropogenic factors can have simultaneous positive and negative effects on parasite transmission, and thus it is important to quantify their net effects on disease risk. Net effects will be a product of changes in the survival and traits (e.g., susceptibility, infectivity) of both hosts and parasites. In separate laboratory experiments, we exposed cercariae of the trematode Echinostoma trivol...

2015
David Roquis Julie M. J. Lepesant Marion A. L. Picard Michael Freitag Hugues Parrinello Marco Groth Rémi Emans Céline Cosseau Christoph Grunau Sergio Costa Oliveira

BACKGROUND Chromatin structure can control gene expression and can define specific transcription states. For example, bivalent methylation of histone H3K4 and H3K27 is linked to poised transcription in vertebrate embryonic stem cells (ESC). It allows them to rapidly engage specific developmental pathways. We reasoned that non-vertebrate metazoans that encounter a similar developmental constrain...

Journal: :Memorias do Instituto Oswaldo Cruz 2010
Joyce Thornhill John Kusel Fabricia Alvisi de Oliviera Fabio Ribeiro Symone Fulgêncio Lima Paulo Marcos Zech Coelho Paul McVeigh Ana Carolina Alves Mattos

Here, we observed the uptake of membrane-impermeant molecules by cercariae as they penetrate the skin and are transformed into schistosomula. We propose that membrane-impermeant molecules, Lucifer Yellow, Propidium iodide and Hoechst 33258 enter the parasite through both thenephridiopore and the surface membrane and then diffuse throughout the body of the parasite. We present a hypothesis that ...

Journal: :Folia parasitologica 2003
Neil J Morley Mark Crane John W Lewis

The toxicity of cadmium and zinc at concentrations ranging from 0.1 to 100 microg/l was investigated against the activity of Diplostomum spathaceum (Rudolphi, 1819) cercariae. Over a 24 h exposure period a significant reduction in cercarial activity occurred in solutions of cadmium, zinc, and a mixture of cadmium and zinc at all concentrations. Reduced cercarial activity also occurred in all to...

Journal: :Revista da Sociedade Brasileira de Medicina Tropical 2017
Kang Wan Peng Wang Leibo Zhang

INTRODUCTION: The activity of garlic oil extract against Schistosoma japonicum cercariae was evaluated. METHODS: The in vitro and in vivo cercaricidal activities against S. japonicum larvae were determined. RESULTS: Exposure to ≥ 10-6 (v/v) garlic emulsions for 30 min led to 100% cercariae mortality; pre-exposure treatment with ≥ 10-4 (v/v) garlic emulsions showed 100% preventive efficacy ...

Journal: :The Journal of parasitology 1992
F Mouchet A Théron P Brémond E Sellin B Sellin

The emergence pattern of Schistosoma curassoni cercariae from Bulinus umbilicatus, whose adult worms parasitize bovine, caprine, and ovine ungulates in Niger, is of a circadian type with a mean emission time at 0855 hr +/- 1 hr 6 min, characteristic of the schistosome species parasitizing domestic or wild cattle. The comparison of this cercarial emergence pattern with those of the other 3 sympa...

Journal: :The Journal of Experimental Medicine 2003
Koan Nakagawa

1. The morbidity of pulmonary distomiasis among the school children in the plains of the Prefecture of Shinchiku is 4.3 per cent, while in the mountainous regions among the savages it reaches in some districts 50 per cent. 2. Seventeen species of cercariae were discovered in fresh water mollusks in the Prefecture of Shinchiku, Formosa. But it was impossible to ascertain from morphological chara...

Journal: :archives of razi institute 2016
k.m. islam m.d. islam s.m.a. rauf a. khan m.k. hossain

the present study was conducted to investigate the prevalence of developmental stages of fasciola gigantica infection in lymnaea snails and their populations in sylhet region of bangladesh. a total of 1865 lymnaea snails were collected and examined, of which 56 (3%) were found to having infected with developmental stages of fasciola gigantica. only 4.08% infected of 515 snails were collected fr...

Journal: :The Onderstepoort journal of veterinary research 1986
C C Appleton K Brock

The ability of the cercariae of Trichobilharzia sp., the commonest avian schistosome in South Africa, to cause dermatitis in man is confirmed, and their progress through and resultant histopathology in rodent skin are documented. These cercariae reach the subcutaneous tissue within one hour after exposure, and some migrate to the lungs. Between 46 and 97 h later, those stranded in the skin have...

Journal: :The Journal of communicable diseases 2010
S L Choubisa

Snails (Mollusca : Gastropoda) are an ideal bio-indicators for palaeo-environments and water quality (pollution) and are much more useful in the classification of ecological diverse aquatic habitats.1-3 These aquatic snails also complete the life cycle of digenetic trematode parasites causing various dreaded trematodiasis diseases in vertebrates including men. Indeed these snails are an interme...

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