Untersuchungen über die Einwirkung verschiedener Durchforstungsgradz auf den Massen- und Wertzuwachs normaler Fichtenbestände     

Karl Hefele 《European Journal of Forest Research》1895,17(5):241-280

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Rassen der gemeinen Kieser     

Peter Karl Ochott 《Forstwissenschaftliches Centralblatt》1907,29(5):262-279

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Karl Hefele 《Forstwissenschaftliches Centralblatt》1895,17(3):115-165

Ohne ZusammenfassungDie nachsolgende Arbeit, ein Ergebnis der sorstl. Abteilung der bahr.sorstl. Bersuchsanstalt, bringt eine von der staatswirtschaftl. Fakultät dert Universität München gekrönte preisausgabe. Um Raum zu ersparen, wurden namentlich an Labellen und Beichnungen Abkürzuugen borgenommen.  相似文献   

Über Buchenmischung im Nadelwald     

Karl Gayer 《European Journal of Forest Research》1897,19(9-10):486-492

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Review of Virus Diseases of Plants (2-CD set)—Virus Diseases Of Plants: Grape,Potato, and Wheat Image Collection and Teaching Resource; Virus Diseases of Plants Image Database Collection     

Karl R. Schneider 《Journal Of Agricultural & Food Information》2013,14(2):172-173

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Offspring investment in wild Atlantic salmon (Salmo salar): relationships with smolt age and spawning condition     

Tim Burton  Simon McKelvey  Dave C. Stewart  John D. Armstrong  Neil B. Metcalfe 《Ecology of Freshwater Fish》2013,22(2):317-321

We investigated the independent effects of age at smolting and body condition at the time of spawning on egg production by female Atlantic salmon (Salmo salar). For a given body size, female salmon that had smolted as juveniles after 2 years in fresh water produced smaller, more numerous eggs than females that smolted 1 year later. Furthermore, fecundity (but not egg size) was related positively to maternal body condition at spawning. Given that age at smolting is closely related to juvenile growth rate; results from this study suggest that conditions experienced by female Atlantic salmon during both early life and adulthood have implications for the size and number of eggs that they produce.  相似文献   

Varietal differences in accumulation of ochratoxin a in barley and wheat cultivars after inoculation of Penicillium verrucosum     

Karin Axberg  Gunnar Jansson  Gunnar Svensson  Karl Hult 《Acta Agriculturae Scandinavica, Section B - Plant Soil Science》2013,63(4):229-237

The natural content of ochratoxin A in grain samples of 6 barley, 2 bread wheat and 1 durum wheat cultivars varied from <0.1 to 0.4 ng/g grain. Samples of the analysed cultivars were surface sterilized and kept in humidity chambers at 20°C and water activity (a_w) 0.75 or a_w 0.85 for 8 days. For both environments, the resulting grain equilibrium water content varied between cultivars of both barley and wheat, attributable to agronomic traits. The samples were then inoculated with Penicillium verrucosum and incubated for up to 23 weeks. With time, all cultivars had increasing ochratoxin A content, with maximum content in different barley cultivars ranging from 34 to 630 ng/g grain for a_w 0.75, and 39 to 260 000 ng/g for a_w 0.85. Corresponding values for the wheat cultivars were 25 to 2 300 ng/g and 650 to 5 200 ng/g. Significant varietal differences in ochratoxin A accumulation were observed for barley (P < 0.0001), attributable to equilibrium water content, amylose content and natural ochratoxin A, and for wheat (P < 0.0001), attributable to protein content and natural ochratoxin A. Barley ‘SW 1306 95/1203’ and ‘SW 906129 Waxy’, and wheat ‘SW 39103’ accumulated significantly less ochratoxin A than the other cultivars.  相似文献   

饲料中补充植酸酶的新策略     

Karl De Bruyne  陆文清  王秀坤 《中国畜牧兽医》2000,27(6):22-26

本文从多方面介绍了在猪和家禽日粮中添加植酸酶 ,包括植酸酶对其他矿物质、氨基酸、动物饮水量及饲料稳定性的影响。同时也讨论了在现代饲料中添加磷酸盐的注意事项。1　植酸酶对其他饲料成分的作用1 .1　提高植酸磷和钙的消化率　众所周知 ,植酸酶可以提高动物对磷和钙的消化吸收 ,Jongbloed于 1 993年建立了一个关于植酸酶活力与饲料中磷酸盐的当量关系式。在含磷酸盐的饲料中添加50 0 IU植酸酶相当于 1 g来自于磷酸一钙的磷或1 .1 g来自于二水磷酸氢钙的磷 (对猪料 )。但随着植酸酶添加量的增加 ,植酸酶的转化当量随即下降。这个关系…  相似文献   

Function of bovine mammary macrophages as antigen-presenting cells     

I. Politis  X. Zhao  B.W. McBride  J.H. Burton 《Veterinary immunology and immunopathology》1992,30(4):399-410

The ability of mammary macrophages treated with Staphylococcus aureus to induce antigen-specific T-cell proliferation was compared to that of the autologous blood monocytes. Induction of T-cell proliferation has been correlated with changes in major histocompatibility complex (MHC) class II antigen expression and interleukin 1 (IL-1) production by mammary macrophages and blood monocytes. The present study showed that both monocytes and mammary macrophages treated with S. aureus induced T-cell proliferation. However, there was a 3-fold decrease (P<0.05) in T-cell proliferation in macrophage cultures compared to those of blood monocytes, when these cells were treated with S. aureus. Mammary macrophages, the cells less effective in stimulating T-cell proliferation, expressed lower levels (2-fold) of MHC class II molecules and produced less IL-1 (3-fold) than blood monocytes. These data suggest that S. aureus may affect macrophage-T cell interaction by modulating the expression of MHC class II molecules and the synthesis of IL-1 by macrophages.  相似文献   

    

Karl Eduard Ney 《Forstwissenschaftliches Centralblatt》1911,33(8-9):421-429

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