全文获取类型
收费全文 | 1261篇 |
免费 | 77篇 |
出版年
2021年 | 10篇 |
2019年 | 12篇 |
2018年 | 15篇 |
2017年 | 8篇 |
2016年 | 25篇 |
2015年 | 45篇 |
2014年 | 53篇 |
2013年 | 56篇 |
2012年 | 65篇 |
2011年 | 71篇 |
2010年 | 57篇 |
2009年 | 58篇 |
2008年 | 63篇 |
2007年 | 79篇 |
2006年 | 74篇 |
2005年 | 78篇 |
2004年 | 62篇 |
2003年 | 49篇 |
2002年 | 65篇 |
2001年 | 15篇 |
2000年 | 14篇 |
1999年 | 16篇 |
1998年 | 18篇 |
1997年 | 25篇 |
1996年 | 23篇 |
1995年 | 18篇 |
1994年 | 16篇 |
1993年 | 11篇 |
1991年 | 14篇 |
1990年 | 8篇 |
1989年 | 10篇 |
1988年 | 13篇 |
1987年 | 8篇 |
1986年 | 8篇 |
1985年 | 9篇 |
1984年 | 11篇 |
1983年 | 9篇 |
1982年 | 9篇 |
1981年 | 15篇 |
1980年 | 9篇 |
1979年 | 8篇 |
1978年 | 8篇 |
1976年 | 11篇 |
1975年 | 7篇 |
1974年 | 8篇 |
1970年 | 9篇 |
1969年 | 6篇 |
1968年 | 6篇 |
1967年 | 6篇 |
1965年 | 5篇 |
排序方式: 共有1338条查询结果,搜索用时 796 毫秒
991.
On the ultrastructure of the rat anococcygeus muscle 总被引:5,自引:0,他引:5
Cell and Tissue Research - The rat anococcygeus muscle, which is known from previous functional and histochemical investigations to be a smooth muscle with a dense adrenergic innervation, was... 相似文献
992.
Berkels Reinhard; Purol-Schnabel Svenja; Roesen Renate 《Journal of applied physiology》2001,90(1):317-320
There are different methods to measure the unstable moleculenitric oxide (NO). We will describe a new sensitive method to measure NO by reconversion of nitrate/nitrite to NO, which will bedetermined with an amperometric Clark-type electrode. Nitrate andnitrite are the degradation products of NO. First, nitrate isenzymatically converted to nitrite with the use of the nitrate reductase. Second, nitrite is reduced to equimolar NO concentrations byan acidic iodide solution. The detection limit of the electrode in anaqueous solution was 2 nmol/l NO (meaning the threshold was dependingon the volume added: 500 µl of a 0.2 µmol/l nitrite solution addedto a 10-ml bath). This method provides the ability to assess basal andagonist-stimulated NO releases of different biological models. Wemeasured basal and carbachol-stimulated NO release of nativeendothelial cells from porcine coronary arteries and porcine aorticendothelial cell cultures. Moreover, it was possible to measure thenitrate/nitrite concentration in the coronary effluent of a guinea pigheart. In conclusion, we present a valid, highly sensitive new methodof measuring nitrite/NO in biological systems with a commerciallyavailable electrode. 相似文献
993.
Renate Kothbauer-Hellmann und Hans Winkler 《Journal of Ornithology》1991,132(3):329-331
994.
Renate Louw-du Toit Janet P. Hapgood Donita Africander 《The Journal of biological chemistry》2014,289(45):31136-31149
995.
Very little is known about the biology and ecology of haploid Armillaria strains in nature. In this outdoor inoculation experiment, we assessed the virulence of six haploid Armillariaostoyae strains along with their diploid parent towards 2-year-old seedlings and 4-year-old saplings of Norway spruce (Picea abies), and determined their ability to colonise freshly cut stumps. As inoculum source an Armillaria-colonised hazelnut (Corylus avellana) stem segment was inserted into the soil substrate. Re-isolations from mycelial fans at the root collar of infected trees or stumps were made. Surprisingly, not a single haploid re-isolate could be recovered. Microsatellite genotyping of 133 re-isolates suggests that the inoculated haploid strains were diploidised either by mating propagules (basidiospores or haploid mycelia) already present in the soil substrate or naturally disseminated in the course of the experiment from nearby forests. Consequently, no conclusion about the infectious ability of haploid Armillaria mycelia under natural conditions can be drawn. Nonetheless, the diploid half-sib families resulting from the diploidisation showed varying degrees of virulence, with a high correlation between the experiment with 2-year-old seedlings and 4-year-old saplings. Despite extensive genotyping of re-isolates, no evidence for somatic recombination between haploid mating propagules and diploidised mycelia was detected, suggesting that this is an uncommon phenomenon in A. ostoyae. 相似文献
996.
997.
998.
Renate Rubbel 《Development genes and evolution》1952,145(6):561-581
Ohne Zusammenfassung 相似文献
999.
Renate Theodor H.Dietmar Zinsmeister Rüdiger Mues Kenneth R. Markham 《Phytochemistry》1980,19(8):1695-1700
Eleven flavone di-C-glycosides, including nine which are new, have been identified in gametophytic material of Apometzgeria pubescens. Tricetin 6,8-di-C-glucoside and tricin 6-C-arabinoside-8-C-pentoside are the major compounds. Another identified was ferulylisoschaftoside. The chemotaxonomic relevance of the flavonoid pattern of Apometzgeria pubescens is briefly discussed. 相似文献
1000.
Renate A. Wesselingh Peter G. L. Klinkhamer Tom J. de Jong Els G. M. Schlatmann 《Ecography》1994,17(3):272-277
We studied geographical variation in the vernalization requirement among European populations of the facultative biennial thistle Cirsium vulgare In two common garden experiments and a growth room experiment we found genotypes that flowered without cold, in their first year These annual types originated mainly from the south of Europe Most of the plants from the northern populations flowered in their second year, after experiencing winter cold We discuss the effects of the absence of a vernalization requirement on the phenotype 相似文献