Results 171 to 180 of about 16,953 (218)

Localisation of serotonin and dopamine in Haemonchus contortus

International Journal for Parasitology, 2011
Serotonin and dopamine play important roles in the biology of nematodes where they exert their effect on feeding, locomotion and reproductive behavior. Haemonchus contortus, a parasitic nematode which infects small ruminants, is responsible for considerable economic losses in agriculture.
Vijayaraghava T S, Rao, Sean G, Forrester, Kathy, Keller, Roger K, Prichard   +3 more
openaire   +2 more sources

Carbohydrate epitopes on Haemonchus contortus antigens

Parasitology Research, 1996
Extracts of infective larvae and adults of the trichostrongylid Haemonchus contortus were studied for the presence of carbohydrate moieties. Several different lectin-binding sites were demonstrated in both stages using a panel of nine lectins. The carbohydrate specificity of the lectins used strongly suggests that alpha-D-mannose, alpha-D-glucose, and ...
Schallig, H. D., van Leeuwen, M. A.
openaire   +3 more sources

Haemonchus contortus resistance to monepantel in sheep

Veterinary Parasitology, 2015
In a sheep farm in the Netherlands with a suspected Haemonchus contortus resistance to monepantel (Zolvix®, Novartis Animal Health), a fecal egg count reduction test was carried out in two groups of lambs, according to the method of the World Association for the Advancement of Veterinary Parasitology.
R, Van den Brom, L, Moll, C, Kappert, P, Vellema   +3 more
openaire   +2 more sources

Detection of resistance to ivermectin in haemonchus contortus

International Journal for Parasitology, 1991
Infective, third-stage (L3) larvae of Haemonchus contortus isolates resistant to ivermectin (IVM) show a decreased sensitivity to IVM-induced paralysis in vitro. The inhibition of larval motility by IVM can be detected in L3 larvae incubated in the dark on an agar matrix containing IVM, by the failure of affected larvae to move when stimulated by ...
J H, Gill, J M, Redwin, J A, van Wyk, E, Lacey   +3 more
openaire   +2 more sources

Haemonchus contortus: The uptake and metabolism of closantel

International Journal for Parasitology, 1997
Closantel is an anthelmintic which associates with plasma albumin and is useful for the control of sheep parasites, such as Haemonchus contortus, that ingest blood. However, the utility of closantel for parasite control has been threatened by the emergence of resistance. The mechanisms of resistance are unknown.
Rothwell, J. T., Sangster, N.
openaire   +5 more sources

Hypergastrinaemia of sheep infected with Haemonchus contortus

Research in Veterinary Science, 1988
Radioimmunoassay of plasma gastrin has shown that a hypergastrinaemia occurs in yearling sheep, after infection with 10(6) infective third stage larvae of Haemonchus contortus. Plasma gastrin concentrations began to rise two to four days after infection, that is, at about the same time as, or slightly before, the abomasal pH was observed to increase.
C D, Nicholls, D L, Lee, T E, Adrian, S R, Bloom, A D, Care   +4 more
openaire   +2 more sources

Development of a vaccine against haemonchus contortus

Parasitology Today, 1993
Haemonchus contortus is an economically important nematode parasite of sheep and the occurrence worldwide of strains resistant to anthelmintic chemicals has emphasized the need to develop a vaccine against it. Here, Ed Munn describes the approach to this problem adopted in his laboratory.
openaire   +2 more sources

The establishment and development of Haemonchus contortus in goats

Veterinary Parasitology, 1990
Twelve 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
openaire   +2 more sources

Haemonchus contortus microtubules are cold resistant

Molecular and Biochemical Parasitology, 2014
Haemonchus 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
openaire   +2 more sources

The mechanism of hatching of eggs of Haemonchus contortus

International Journal for Parasitology, 1977
Abstract 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
openaire   +2 more sources