Abortion and perinatal foal mortality associated with equine herpesvirus type 1 in a herd of Grevy's zebra   总被引：2，自引：0，他引：2  

P L Wolff  T P Meehan  E J Basgall  G P Allen  J P Sundberg 《Journal of the American Veterinary Medical Association》1986,189(9):1185-1186

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DETECTION OF A LIVER TUMOR IN A BEAGLE DOG USING SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY     

Ronald K.  Wolff  PhD  Wayne F.  Beierman  P. ENG  Margaret J.  Mason  DVM  Jack R.  Harkema  DVM  PhD  Bruce A.  Muggenburg  DVM  PhD 《Veterinary radiology & ultrasound》1988,29(4):179-183

This case report describes the detection of a liver tumor in an 11–year-old female Beagle dog using single photon-emission computed tomography (SPECT). A mass was palpated in the cranial abdomen during removal of recurrent mammary tumors. A conventional nuclear medicine liver scan, following injection of ^99mTc-sulfur colloid, was equivocal. SPECT was then performed in a second procedure, using a simple system that rotated the dog before a gamma camera. Transverse plane images clearly showed a spheric space-occupying lesion, found at gross necropsy and confirmed histologically as a hepatoma. Discrete liver tumors may be detected more readily and their size determined more accurately using SPECT than with conventional nuclear medicine approaches.  相似文献   

Application de la chromatographie en phase gazeuse au controle de la purete des corps gras     

J. P. Wolff 《Plant foods for human nutrition (Dordrecht, Netherlands)》1964,11(2-4):329-338

Résumé La chromatographie gazeuse, malgré les difficultés rencontrées dans l'interprétation quantitative des chromatogrammes, est suffisamment reproductible pour être appliquée aux contrôles de la pureté des corps gras.Par la mise en évidence d'acides gras étrangers à la composition de l'huile (ou de la gra sse) examinée, par la comparaison de sa composition générale avec la composition moyenne des produits de ce type, par la détermination de certains rapports de constitution, la chromatographie gazeuse permet de contrôler la pureté des corps gras avec une sensibilité qu'il était impossible d'envisager il y a quelques années.

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Summary Gas-chromatography, despite the difficulties met in the quantitative interpretation of chromatograms, is sufficiently reproducible to be applied to the industrial controls of fats.By showing the presence of fatty acids foreign to the composition of the studied oil (or fat), by the comparison of its general composition with the average composition of this type of products, by the determination of certain constitutional relations, gas chromatography gives us the possibility to control the purity of fats with a sensitivity that we could not have considered a few years ago.

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Zusammenfassung Die Gaschromatographie ist, trotz der angetroffenen Schwierigkeiten in der quantitativen Auswertung der Chromatogramme, genügend reproduzierbar um für industrielle Kontrollen der Reinheit von Fetten angewandt zu werden.Durch Darstellung der Ölzusammensetzung (oder der Zusammensetzung der Fette) artfremder Fettsäuren in den untersuchten Proben, durch Vergleich seiner Allgemeinzusammensetzung mit der Durchschnittszusammensetzung von Produkten dieses Typs, durch die Bestimmung bestimmter Komponentenbeziehungen, ermöglicht die Gaschromatographie es, die Reinheit der Fette mit einer Genauigkeit zu prüfen, die man vor einigen Jahren nicht für möglich gehalten hätte.

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Effect of oxyphenylbutazone on surgical wounds of horses     

H A Gorman  W A Wolff  W W Frost  W V Lumb  A W Nelson 《Journal of the American Veterinary Medical Association》1968,152(5):487-491

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Effects of halothane and chloroform anesthesia on the equine liver   总被引：2，自引：0，他引：2  

W A Wolff  W V Lumb  M K Ramsay 《American journal of veterinary research》1967,28(126):1363-1372

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Epizootology of the incidence of ascariasis in swine     

F Muff  W Koch  K Wolff 《Schweizer Archiv für Tierheilkunde》1984,126(8):409-428

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Implications of using small meshed gillnets for the sustainability of fish populations: a theoretical exploration based on three case studies          下载免费PDF全文

M. Wolff  M. H. Taylor  G. Tesfaye 《Fisheries Management and Ecology》2015,22(5):379-387

The study explores the impacts of varying gillnet mesh size and fishing level on yield per recruit (Y/R), escapement spawning stock (ESS) and mega‐spawners (MS) of three widely distributed freshwater fishery target species. Y/R is maximised when the optimal length of capture (L_cap) is above the size of maturity (L₅₀). However, the unimodal shape of gillnet selectivity results in lower impacts to ESS and MS with both smaller and larger mesh sizes. Under conditions of moderate exploitation, the fraction of MS was significantly larger if small meshed gillnets were used. This is due to the relatively smaller cumulative vulnerability from small mesh sizes through time, as they target a smaller size range of fish, which also grow more quickly through the vulnerable window due to higher growth rates. Therefore, unlike trawls and beach seines, which select all size classes beyond the minimum length of capture (L_c), small meshed gillnets are not necessarily destructive and may rather promote sustained production by allowing a higher proportion of the spawning biomass to remain in the stock. The work also helps to explain the observation of sustained fish production in many developing countries despite the persistent use of gillnets of small mesh size that target small, under‐sized individuals.  相似文献   

Comparative assessment of food web structure and fisheries productivity of three reservoirs in Ghana     

Seth Mensah Abobi  Lotta Clara Kluger  Matthias Wolff 《Fisheries Management and Ecology》2021,28(6):573-591

Three Ghanaian reservoirs (Tono, Bontanga and Golinga) were compared through a food web modelling approach (Ecopath with Ecosim) to assess production characteristics and food web structures. The lakes differ in size and morphology, generating specific conditions for fish growth and production. While the two top fishery target species were Sarotherodon galilaeus (L.) and Oreochromis niloticus (L.) in all reservoirs, the mean trophic level of the catch was lowest in the largest and deepest reservoir (Tono) due to higher trophic level species occupying less accessible deep “refuge” habitats. The smallest lake had the highest fish production under optimal conditions of water supply (17.1 compared with 15.5 and 10.1 t/km²/year for lakes Bontanga and Tono), but it appears to be most vulnerable under conditions of drought. For the planning and construction of adequately sized reservoirs used for fishery and irrigation purposes, the water budget (ratio of inflow and evaporation) needs to be estimated.  相似文献   

Acid precipitation     

Wolff GT 《Science (New York, N.Y.)》1982,216(4551):1172

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Mit neuen Verfahren gegen Fruchtwickler in Kleingartenanlagen     

Von R. Albert  R. Wolff 《Journal of pest science》2000,73(3):79-82

The availability of pesticides in private gardens is limited by local law in the State of Baden-Württemberg in south-west Germany. Only 26 insecticides, fungicides and molluscicides are permitted. Hence, only pesticides such as Bacillus thuringiensis, Granulosis Virus, pyrethrum or the pheromone mating disruption method (PMDM) can be used for moth control in apple. The use of beneficials like Trichogramma sp. or Chrysoperla carnea is not limited. PMDM had not been previ-ously investigated in allotments until the experiments reported here were carried out in 1998 and 1999. In these experiments, PMDM was compared with the use of the egg parasites, Trichogramma dendrolimi and T. cacoeciae. The observations were done in 102 allotments, each of about 300 m². The gardeners are members of a special club for the allotments and they often organize the bulk acquisition of plants or fertilizers for the club. Sometimes the club obtains plant protection products when something has to be done in all allotments. The codling moth and the plum fruit moth are important pests in these allotments.In 1997, attacks of codling moth were generally low throughout the southern Germany. This was reflected in the allotments where there was less than one per cent fruit damage with PMDM or the egg parasites the following year. During 1999, the attacks were generally much higher resulting in a higher use of insecticides in commercial German orchards. In the allotments, about six to eight per cent of fruits were damaged by the codling moth in both experimental treatments.The results indicate that PMDM can be successful in allotments and is equally as effective as the use of egg-parasites. But further experiments are required.  相似文献