Results 141 to 150 of about 4,792 (182)
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Extracellular Matrix Degradation by Haemonchus contortus
The Journal of Parasitology, 1996To better understand the in vivo function of secreted cysteine proteases of Haemonchus contortus, the ability of live parasites to degrade connective tissue was investigated using [3H]proline-labeled extracellular matrix produced by smooth-muscle cells (R22).
M L, Rhoads, R H, Fetterer
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The establishment and development of Haemonchus contortus in goats
Veterinary Parasitology, 1990Twelve goats were inoculated with 40,000 third-stage Haemonchus contortus larvae and two were killed on each of Days 4, 7, 11, 14, 18 and 21 after inoculation (DAI). The number of worms that established, and the site of development were recorded. More worms established in the fundic, than in the middle or pyloric thirds of the abomasum.
W A, Rahman, G H, Collins
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Haemonchus contortus: Food of preinfective larvae
Experimental Parasitology, 1971Abstract Haemonchus contortus eggs were bacterially sterilized and cultivated in three different preparations of Escherichia coli cultures and a nutrient broth at 30 C for 7 days. The following percentages of infective larvae were recovered: supernatant fluid from E. coli culture, 0%; washed E. coli , 71%; heat-killed E.
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Haemonchus contortus microtubules are cold resistant
Molecular and Biochemical Parasitology, 2014Haemonchus contortus is an important nematode of livestock that is present in most parts of the world. The life cycle comprises free living stages (egg, L1, L2 and L3 larvae), and parasitic stages (L4, adult and egg) in a ruminant. Microtubules are filamentous structures which are made from polymerization of α- and β-tubulin. In vitro polymerization of
Shoaib Ashraf, Roger K. Prichard
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The mechanism of hatching of eggs of Haemonchus contortus
International Journal for Parasitology, 1977Abstract Fluid collected from hatching eggs of Haemonchus contortus contained a lipase which hydrolysed 2-naphthyl laurate (about 0·7 μmol naphthol freed /h/10 6 eggs). The fluid also hydrolysed l -leucinamide (about 2·3 μmol leucine freed/h/10 6 eggs). The fluid when added to normal or heated eggs caused ‘hatching’.
W P, Rogers, F, Brooks
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Levamisole binding sites in Haemonchus contortus
International Journal for Parasitology, 1998Larval and adult extracts from isolates of Haemonchus contortus were assayed for specific [3H]levamisole binding activity. All of the tissue preparations displayed [3H]levamisole binding sites. The sensitive isolate SE and resistant isolate RJ showed no differences in larval and adult binding data. Larval SE extracts had higher receptor density (Bmax =
M J, Moreno-Guzmán +5 more
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Inheritance of avermectin resistance in Haemonchus contortus
International Journal for Parasitology, 2000A larval development assay was used to compare the responses of the Chiswick Avermectin Resistant (CAVRS) isolate of Haemonchus contortus, an avermectin-susceptible isolate (VRSG) and their crosses to avermectins. The F(1) and F(2) generations of reciprocal crosses between CAVRS and VRSG were denoted as CAVRS malesxVRSG females=CXV, and VRSG ...
Le Jambre, LF +3 more
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Progress on vaccination against Haemonchus contortus
International Journal for Parasitology, 1995Control of Haemonchus contortus at present is largely by the use of anthelmintics, assisted in some regions by management programs. Widespread development of resistance, particularly in South Africa and Australia, and concerns associated with the manufacture and use of chemicals have led to increasing interest in vaccination as an alternative means of ...
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A Developmentally Regulated Hyaluronidase of Haemonchus contortus
The Journal of Parasitology, 2000The trichostrongylid nematode Haemonchus contortus released a hyaluronic acid-degrading enzyme during in vitro development from the third (L3) to fourth (L4) larval stage. The enzyme did not degrade chondroitin sulfate A. Enzyme activity was optimal between pH 4.0 and 6.0, and the enzyme was inhibited by high concentrations of NaCl; the divalent ...
M L, Rhoads +2 more
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