Otto Martin Radostits 1934 – 2006     

DC Blood  CC Gay  KW Hinchcliff  PD Constable 《Australian veterinary journal》2007,85(6):231-231

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The use of lot-feeding to enhance the reduction of benzene hexachloride residues in cattle     

SA SPENCE  KW McDOUGALL  EB DETTMANN 《Australian veterinary journal》1990,67(10):383-383

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Freilandversuche zur Wirksamkeit von DDT und Baytex gegen Larven vonSimulium damnosum in Guinea,Westafrika     

R. Garms  A. Post 《Journal of pest science》1967,40(4):49-56

Zusammenfassung Im Rahmen einer Untersuchung über die Verbreitung vonSimulium damnosum in Guinea wurden einige vergleichende Freilandversuche mit Emulsionskonzentraten von DDT und Baytex (Fenthion) gegen die Larven dieses wichtigen Onchocercose-Überträgers ausgeführt. Mit Konzentrationen von 0,1 bis 0,15 ppm DDT, die 30 Minuten lang unterhalten wurden, konnte im Niger und im Mafou bei günstigem Wasserstand eine sichere Abtötung der Larven über 45–60 km erreicht werden. Mit Absinken des Wasserspiegels in der fortgeschrittenen Trockenzeit wurden die Ergebnisse ungünstiger. Baytex wirkte bei 0,25 und 0,35 ppm über längere Strecken nur unzureichend, war aber sicher wirksam, wenn es an kleineren abgeschlossenen Brutplätzen in Bächen und Bewässerungsanlagen appliziert wurde. Im Vergleich mit DDT erscheint die Anwendung von Baytex in solchen Brutplätzen vorteilhafter, da es nur im Brutgebiet selbst wirkt und die Gewässer nicht über längere Strecken vergiftet. Durch DDT und Baytex wurden nicht nur die Larven vonSimulium damnosum, sondern auch die der anderen Simulienarten und der meisten anderen Wasserinsekten vernichtet. In einem Versuch mit 0,1 ppm DDT wurde eine Fischsterblichkeit beobachtet. In Empfindlichkeitstests mit 0,02 bis 0,05 ppm DDT wurde keine vollstä ndige Abtötung der Larven vonS. damnosum erreicht.

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Summary Comparative field experiments were carried out on the effect of DDT and Baytex (fenthion) against the larvae ofSimulium damnosum THEOBALD (Simuliidae, Diptera) in the Republic of Guinea. In the rivers Niger and Mafou DDT concentrations of 0,1 and 0,15 ppm per 30 minutes were effective in eliminating the larvae up to a distance of 60 kilometers. However as river discharge decreased with the progress of the dry season the results became less favourable. Baytex was poorly effective in rivers over long distances when given in concentrations up to 0,35 ppm per 30 minutes. However, when the insecticide was applied to limited smaller breeding places in streams and irrigation systems 0,25 ppm were proved to be fully effective. Under such conditions the application of Baytex appears to be more advantageous as it manifests itself only in the breeding area and, is less persistent. DDT and Baytex killed also the larvae of the other blackfly species as well as a considerable part of the other water insects. In one experiment using 0,1 ppm DDT fish mortality was observed. In susceptibility tests using 0,05 ppm DDT with larvae ofS. damnosum partial mortality was only achieved.

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Résumé Des expériences comparatives entre l'efficacité du DDT et du Baytex contre les larves deS. damnosum ont été effectués en République de Guinée. Avec du DDT (concentration de 0,1 à. 0,15 ppm 30) dans les fleuves Mafou et Niger les larves pouvaient être detruit sur un parcours de 60 km. Le résultat était defavorable en saison sèche avec la baisse du niveau des eaux. Baytex (concentration allant jusqu'à 0,35 ppm) n'agit pas suffisant sur une grande distance. Cependant son application dans des gîtes limités (marigots et canaux d'irrigation) a donné de bons résultats. Ces deux insecticides tuent des larves d'autres espèces de Simulies, ainsi que beaucoup d'autres larves d'insectes aquatiques. A la suite d'une application de DDT à 0,1 ppm des poissons morts ont été observé s. Les tests de sensibilité au DDT de 0,02 à 0,05 ppm 30 ne donnent pas une mortalité complète des larves deS. damnosum.

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Die Versuche wurden im Rahmen eines Onchocercose-Projekts des Bundesministeriums für Gesundheitswesen der Bundesrepublik Deutschland ausgeführt.  相似文献   

赴黑龙江省检查秋季森林防火工作情况报告     

国家森林防火指挥部赴黑龙江省检查组 《森林防火》2007,(4):8-9

根据国家森林防火指挥部领导的指示要求，国家林业局防火办组成了由国家森防指专家组成员、森林防火专业委员会主任朴东赫带队的秋防工作检查组，于2007年10月12日～19日赶赴黑龙江省，对当地秋季森林防火工作进行了检查调研。检查期间，工作组主要采取实地检查、抽查、座谈了解、听取汇报等方式，重点检查了哈尔滨、佳木斯、鹤岗三个地市辖区内的地方林业局、省森工总局林管局、  相似文献   

An extension of Jacobs' method for measuring residual growth strains in logs     

I. L. Post  J. C. Atherton  C. P. Vendhan  Professor R. R. Archer 《Wood Science and Technology》1980,14(4):289-296

Summary Previous methods for measuring residual longitudinal growth strain distributions in logs are reviewed. An extension is given of Jacobs' method for measuring growth strains which yields residual strain information at many points in the cross section other than along the diametrical plank. Some of the longitudinal growth strain distributions measured using the new method are presented.This work was supported in part by NSF Grant ENG-74-02428  相似文献   

Wechselwirkungen zwischen Boden-Huminstoffen und Metall-Ionen I. Isolierung und Charakterisierung der Boden-Huminstoffe     

Wilfried Finger  Bernhard Post  Horst Klamberg 《植物养料与土壤学杂志》1990,153(5):305-312

Interactions between soil humic substances and metal ions I. Isolation and characterization of the soil humic substances From two horizons of a podzol humic acids and fulvic acids were isolated by two different methods. The obtained samples were characterized by elemental analysis, the determination of the ash and moisture content, functional group analysis as well as FTIR-, ¹H-NMR-, and ¹³C-NMR-spectroscopic examinations. In spite of the different isolation methods humic and fulvic acids show great similarities. A higher oxidized state and a lower content of aromatic structural features are clearly observed in the fulvic acids in contrast to humic acids. Besides aromatic structural elements, distinct aliphatic sections were detected in the investigated samples, which showed a lower concentration in the less transformed fractions of the Ahe-horizon.  相似文献   

Canopy cover and groundlayer vegetation dynamics in a fire managed eastern sand savanna     

Marlin Bowles  Steven ApfelbaumAlan Haney  Susan LehnhardtTom Post 《Forest Ecology and Management》2011,262(11):1972-1982

Savanna vegetation is characterized by high and variable ground layer species richness regulated by functional group interactions with fire regimes and canopy cover. Frequent fire selects for C4 grasses and prairie forbs in canopy openings and C3 graminoid species and shade-adapted forbs and shrubs in canopy shade. Frequent fire also maximizes heterogeneity in partial canopy cover and species richness across the full canopy gradient. However, few studies have linked fire induced change in tree canopy cover with groundlayer vegetation dynamics in relation to this model. In 1986 and in 2007, we measured canopy cover and sampled groundlayer vegetation in 1 m² plots along 53 transects at the Tefft Savanna, a fire managed 197 ha eastern sand savanna with strong canopy cover and elevation gradients. We analyzed temporal change in canopy cover and groundlayer vegetation, correlating percent change in canopy cover with change in ground layer functional groups. After 20 years of burning at 3 fires/decade, elevation accounted for 62% of the variation in an NMS ordination of groundlayer vegetation. However, canopy cover, which averaged 24-86% in 2007, had a significant secondary effect on the ordination. Five vegetation types classified by TWINSPAN varied significantly in elevation and canopy cover. Woody vegetation comprised 8 of the 12 species with greatest niche breadths, and tended to predominant in woodland or forest, where tree cover averaged 50% or more. Forbs had greater richness in savanna, which averaged less than 30% canopy cover. The C3 sedge Carex pensylvanica was the dominant graminoid species under woodland canopy cover, and was co-dominant with the C4 grasses Andropogon scoparius and Sorghastrum nutans under savanna canopy cover. As in other savannas, N-fixing species sorted across shade and canopy openings, and heterogeneity among transects was maximized at mid-canopy cover. Over time, canopy cover decreased up to 50%, creating more open savanna conditions at mid to high elevations. This decrease was associated with a 20-100 % increase in species richness and was significantly correlated with increasing richness and cover of C4 grasses and summer flowering prairie and woodland forbs. These results support a canopy cover model of fire-maintained savanna vegetation, with greater abundance of C4 grasses and prairie forb species associated with lower canopy cover, greater heterogeneity at mid-canopy cover, and species richness maximized across the light gradient. They also indicate that decreasing canopy cover caused by repeated burning increases species richness and abundance of C4 and prairie forb species.  相似文献   

Wechselwirkungen zwischen Boden-Huminstoffen und Metall-Ionen II. Untersuchung von Boden-Huminstoffen mit der Gel-Permeations-Chromatographie und der Dampfdruck-Osmometrie     

Wilfried Finger  Bernhard Post  Horst Klamberg 《植物养料与土壤学杂志》1991,154(4):287-291

Interaction between soil humic substances and metal ions. II. Investigation of soil humic substances by gel permeation chromatography and vapour pressure osmometry By gel permeation chromatography and vapour pressure osmometry average molar masses of soil fulvic and soil humic acids from two horizons of a podzol were determined. For the fulvic acids average molar masses of 9000 g/mol were obtained by the chromatographic method, while 5000 g/mol were obtained by the osmometric method. In contrast to these results for the humic acids values were measured which are 3 - 4 times larger when measured by gel permeation chromatography and 2 - 3 times smaller when measured by vapour pressure osmometry. The average molar masses found show that the applied methods of isolation and purification as well as the different determination methods with the experimental conditions attached to them have a considerable influence on the molecular size of the isolated humic substances.  相似文献   

Fusion reactors as future energy sources     

Post RF  Ribe FL 《Science (New York, N.Y.)》1974,186(4162):397-407

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The Earth's Mantle: Evidence of Non-Newtonian Flow     

Post RL  Griggs DT 《Science (New York, N.Y.)》1973,181(4106):1242-1244

Recent information from experimentally deformed dunite coupled with a reanalysis of data on the Fennoscandian postglacial rebound suggest that the rheological behavior of the upper mantle is distinctly non-Newtonian, and that the shear strain rate is proportional to the shear stress raised to about the third power.  相似文献