In vitro potential antioxidant activity of (1-->3),(1-->6)-beta-D-glucan and protein fractions from Saccharomyces cerevisiae cell walls     

Jaehrig SC  Rohn S  Kroh LW  Fleischer LG  Kurz T 《Journal of agricultural and food chemistry》2007,55(12):4710-4716

(1-->3),(1-->6)-Beta-D-Glucan, a cell wall polysaccharide in many microorganisms, fungi and algae, is a well-known biological response modifier. Recently, it was found that (1-->3)-beta-D-glucan from Saccharomyces cerevisiae also exhibits antioxidative capabilities. In this study the antioxidative activity of the cell wall fractions of brewer's yeast was investigated. Particular emphasis was put on the question to which extent glucan is responsible for the antioxidative activity of the cell walls and how the other cell wall components might contribute. For the experiments yeast cell walls from brewery fermentations were used. Glucan was isolated by a three-step extraction procedure including a combination of hot water and enzymatic treatment. The level of (1-->3),(1-->6)-beta-D-glucan in the cell walls was analyzed enzymatically. The antioxidant activity was determined by electron paramagnetic resonance spectrometry and Trolox equivalent antioxidant capacity assay. The results show that the antioxidative activity of yeast cell wall proteins exceeds that of beta-glucan greatly. Especially aromatic side chains and free thiols from denatured proteins seem to work as antioxidants.  相似文献   

PHENOTHIAZINE AS AX ANTHELMINTIC FOR HORSES, CATTLE AND PIGS     

F. H. S. Roberts  D.SC 《Australian veterinary journal》1941,17(4):130-137

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Prevalence of the causes of fleece derangement among sheep flocks in New South Wales     

PW JOHNSON  JC BORAY  JW PLANT  SC BLUNT† 《Australian veterinary journal》1993,70(6):220-224

SUMMARY An investigation of sheep flocks with unknown histories of fleece derangement, selected at random from the main sheep raising areas of New South Wales, showed that Psorergates ovis was present in 53 of the 177 flocks surveyed and In 162 of the 3495 sheep examined. Of the single causes of fleece derangement, the most prevalent was grass seed contamination (15.7%) followed by Infestation with sheep body lice, Bovicola ovis, (14.7%) and Infestation with Itch mite (7.8%). The prevalence of fleece derangement was significantly higher on sheep In which lice were the only ectoparasites found than on those In which Itch mites were the only ectoparasites present. The greatest prevalence of P ovis was In flocks In the Young, Yass, Mudgee and Tenterfield districts. In most affected flocks, more than one potential cause of fleece derangement was present. Itch mite Infestation was more prevalent in flocks that received no treatment for ectoparasites than in those that had been treated in the year preceding the survey. Our results did not support a commonly held belief among farmers that arsenical compounds control Infestations of Itch mites more effectively than other types of pesticides. There was no significant difference in prevalence of fleece derangement between flocks treated with different pesticide groups and those that received no treatment, but mean fleece derangement score was significantly lower in sheep treated with organophosphates than in untreated sheep. Infestations of lice were significantly more prevalent in sheep from flocks treated with synthetic pyrethroids than from those treated with organophosphates or those that received no treatment.  相似文献   

In vitro Effect of Zearalenone and α-Zearalenol on Boar Sperm Characteristics and Acrosome Reaction   总被引：2，自引：0，他引：2  

IA Tsakmakidis  AG Lymberopoulos  C Alexopoulos  CM Boscos  SC Kyriakis 《Reproduction in domestic animals》2006,41(5):394-401

This study was conducted to determine the in vitro effects of three different concentrations (125, 187.5 and 250 microM in diluted semen) of zearalenone (zen) and alpha-zearalenol (alpha-zen) on boar sperm. Semen parameters such as motility, viability and spontaneous acrosome reaction were evaluated. From the results it was shown that both zen and alpha-zen affected the sperm characteristics significantly (p < 0.05), except for alpha-zen at the low concentration which did not decrease the percentage of live reacted spermatozoa significantly. In conclusion, zen and alpha-zen are directly toxic when they affect boar semen in vitro and consequently decrease the fertilization ability of the sperm. The higher the concentration of mycotoxin tested, the greater the decline of sperm parameters noticed. The influence of mycotoxins was found to be time- and dose-dependent.  相似文献   

ECOLOGY OF THE FREE-LIVING STAGES OF NEMATODE PARASITES OF SHEEP   总被引：2，自引：0，他引：2  

A. D. Donald  B.V.SC  Ph.D. 《Australian veterinary journal》1968,44(4):139-144

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NEWER PENICILLINS IN VETERINARY PRACTICE   总被引：1，自引：0，他引：1  

P. B. English  M.V.SC. 《Australian veterinary journal》1968,44(4):174-178

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STUDIES ON NON-CONTAGIOUS POSTHITIS OP SHEEP     

W. H. Southcott  B.V.Sc. R. W. Hewetson  B.V.SC. 《Australian veterinary journal》1959,35(3):65-74

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AN UNUSUAL NEOPLASM IN THE UTERUS OF A COW     

R. W. Hewetson  B.V.SC P. D. Carter  B.V.SC 《Australian veterinary journal》1955,31(3):80-80

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IN VITRO STUDIES ON THE TOXICITY OF AN AMINOQUINOLINE PIROPLASMOCIDE     

D. S. Kronfeld  B. SC  M.V.Sc. 《Australian veterinary journal》1959,35(9):417-419

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PHOSPHORUS DEFICIENCY IN CATTLE IN THE NORTHERN TERRITORY AND ITS CONTROL     

J. E. Barnes  B. V. SC B. R. Jephcott  B. SC  A.R.A.C.I 《Australian veterinary journal》1955,31(12):302-316

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