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Browsing South African National Veterinary Repository by Author "Neitz, Albert Walter Herman"
Now showing items 1-20 of 21
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Neitz, Albert Walter Herman; Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Vermeulen, N.M.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)The isolation, characterization and kinetic properties of a toxic and non-toxic anti-protease from the eggs of A. hebraeum are compared with similar data obtained for eggs of other tick species. The biochemistry of various ...
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Neitz, Albert Walter Herman; Heartwater : Past, Present and Future. Workshop (1986 : Kruger National Park, South Africa); Vermeulen, N.M.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)The functional significance of some components of salivary glands and of their secretion and of haemolymph of Amblyomma hebraeum and other tick species is reviewed with respect to host responses at the attachment site, the ...
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Neitz, Albert Walter Herman; Viljoen, G.J.; Van Wyngaardt, S.; Gothe, R.; Visser, L.; Bezuidenhout, J. Dürr; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)One-day-old leghorn chickens were used in a laboratory assay to determine the toxicity of crude extracts of the tick Argas (Persicargas) walkerae and of fractions obtained during the isolation procedure. Extracts of unfed ...
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Neitz, Albert Walter Herman; Viljoen, G.J.; Bezuidenhout, J. Dürr; Oberem, P.T.; Vermeulen, N.M.J.; Van Wyngaardt, Wouter; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1986)A sensitive and reliable enzyme-linked immunosorbent assay for the detection of antibodies to Cowdria ruminantium in serum and C. ruminantium antigen in Amblyomma hebraeum nymphae is described. For the screening of antibodies, ...
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Neitz, Albert Walter Herman; Viljoen, G.J.; Oberem, P.T.; Visser, L.; Vermeulen, N.M.J.; Bezuidenhout, J. Dürr; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1986)An enzyme-linked immunosorbent assay was used to detect Cowdria ruminantium antibodies during the course of heartwater disease. IgM antibodies reached a maximum on the 4th day after infection and disappeared on the 7th ...
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Neitz, Albert Walter Herman; Rossouw, Mirinda; De Waal, D.T.; Du Plessis, J.L.; Van Gas, Letitia; Brett, Susan; Verwoerd, Daniel Wynand (Published by the Government Printer, Pretoria., 1990)Immunoblotting of Cowdria ruminantium proteins with sheep or bovine antiserum identified 2 antigenically conserved proteins, one being an immunodominant 31 kDa and the other a minor 27 kDa protein. These proteins are present ...
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Neitz, Albert Walter Herman; Gothe, R.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1985)By leaving open in tum the genital orifice, coxal apertures and anus , the present study has shown that engorged female Argas walkerae release at least 1 volatile pheromone mainly, or maybe exclusively, from the genital ...
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Neitz, Albert Walter Herman; Gothe, R.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1985)It was shown in this study that Rhipicephalus evertsi evertsi males emit pheromones in the preparasitic as well as in the parasitic phases. Conspecific unengorged male and female images exhibited a high response to ...
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Prozesky, Leon; Neitz, Albert Walter Herman; Bezuidenhout, J. Dürr; Putterill, John Fraser; Potgieter, D.J.J.; Steyn, P.J.J.; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B. (Published by The Government Printer, Pretoria, 1981)A purification procedure involving iso-electric focusing by means of which a toxic principle may be obtained in a pure form from crude egg extracts of Amblyomma hebraeum is described. The molecular mass of the toxin is ...
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Neitz, Albert Walter Herman; Vermeulen, N.M.J.; Gothe, R.; Senekal, A.C.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1986)Major differences were observed in hexane, ethanol and butanol extracts of eggs obtained from Rhipicephillus evertsi evertsi females in which the porose areas functioned normally (AP⁺ eggs) and from R. evertsi evertsi in ...
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Neitz, Albert Walter Herman; Gothe, R.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1984)During investigations into the volatility of female pheromones of A. walkerae in a Y -shaped olfactometer, engorged conspecific male ticks responded weakly both to female-contacted filter paper discs and to intact females ...
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Prozesky, Leon; Verschoor, J.A. (Jan Adrianus), 1953-; Neitz, Albert Walter Herman; Viljoen, Gerrit Johannes; Vermeulen, N.M.J.; Oberem, P.T.; Bezuidenhout, J. Dürr; Putterill, John Fraser; Visser, L.; Bigalke, R.D. (Published by The Government Printer, Pretoria, 1985)The isolation of Cowdria ruminantium by means of wheat germ lectin affinity chromatography as described in this paper permits the recovery of partially purified viable organisms under mild conditions in short time. These ...
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Neitz, Albert Walter Herman; Verschoor, J.A. (Jan Adrianus), 1953-; Viljoen, G.J.; Bezuidenhout, J. Dürr; Oberem, P.T.; Putterill, John Fraser; Visser, L.; Vermeulen, N.M.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1986)The isolation of Cowdria ruminantium by means of Percoll density gradient centrifugation permits the recovery of partially purified viable populations of the organism possessing distinctly different densities. These ...
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Neitz, Albert Walter Herman; Viljoen, G.J.; Bezuidenhout, J. Dürr; Oberem, P.T.; Vermeulen, N.M.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1988)Investigation into the presence of C. ruminantium antigen, using an enzyme-linked immunosorbent assay (ELISA) in various tick tissues and haemolymph of adult Amblyomma hebraeum ticks revealed that the organism invades a ...
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Proteins and free amino acids in the salivary secretion and hemolymph of the tick Amblyomma hebraeum Neitz, Albert Walter Herman; Howell, C.J.; Potgieter, D.J.J.; Bezuidenhout, J. Dürr; Steyn, P.J.J; Bigalke, R.D.; Cameron, Colin McKenzie; Gilchrist, Frances M.C.; Morren, A.J.; Verster, Anna J.M.; Verwoerd, Daniel Wynand; Walker, Jane B. (The Government Printer, Pretoria, 1978)Electrophoretic and chromatographic separations of the salivary secretion of Amblyomma hebraeum showed a less complex protein pattern than that of Ornithodoros savignyi. A hyaluronidase active component was isolated. The ...
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Neitz, Albert Walter Herman; Vermeulen, N.M.J.; Viljoen, G.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)The isolation of Cowdria ruminantium by differential and isopycnic density gradient centrifugation is reviewed with special reference to the suitability of Percoll as density gradient medium. Infected sheep brain, Amblyomma ...
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Neitz, Albert Walter Herman; Vermeulen, N.M.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)Immunoselective methods with special reference to immunoadsorbent affinity chromatography as a means for the isolation of Cowdria ruminantium are reviewed. Attention is given to the source of the organism, immunization, ...
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Vermeulen, N.M.J.; Neitz, Albert Walter Herman; Viljoen, G.J.; Bigalke, R.D. (Published by the Government Printer, Pretoria., 1987)This review covers the isolation of Cowdria ruminantium by lectin cellular affinity chromatography from different Amblyomma hebraeum sources. Cellular affinity chromatography has been reviewed with special attention being ...
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Howell, C.J.; Neitz, Albert Walter Herman; Potgieter, D.J.J.; De Kock, V.E.; Bigalke, R.D.; Cameron, Colin McKenzie; Verster, Anna J,M.; Walker, Jane B. (Published by The Government Printer, Pretoria, 1975)Mice, exposed to the effects of the oral secretion of Ornithodorus savignyi by injection, revealed that a potent toxin is present in the secretion. Electrophoretic and chromatographic separations of the secretion showed a ...
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Neitz, Albert Walter Herman; Spickett, Arthur M.; Burger, D.B.; Crause, J.C.; Roux, Elizabeth M.; Verwoerd, Daniel Wynand (Published by the Agricultural Research Council, Onderstepoort Veterinary Institute., 1991)Although of low morbidity, sweating sickness is readily induced in calves by infestation with positive Hyalomma truncatum adult ticks. This epitheliotrophic disease has no specific cure except by the administration of ...
Now showing items 1-20 of 21