全文获取类型
收费全文 | 2111篇 |
免费 | 212篇 |
国内免费 | 2篇 |
专业分类
2325篇 |
出版年
2023年 | 17篇 |
2022年 | 26篇 |
2021年 | 50篇 |
2020年 | 42篇 |
2019年 | 34篇 |
2018年 | 46篇 |
2017年 | 42篇 |
2016年 | 71篇 |
2015年 | 132篇 |
2014年 | 123篇 |
2013年 | 152篇 |
2012年 | 180篇 |
2011年 | 173篇 |
2010年 | 119篇 |
2009年 | 92篇 |
2008年 | 140篇 |
2007年 | 150篇 |
2006年 | 112篇 |
2005年 | 81篇 |
2004年 | 94篇 |
2003年 | 82篇 |
2002年 | 63篇 |
2001年 | 38篇 |
2000年 | 19篇 |
1999年 | 15篇 |
1998年 | 16篇 |
1997年 | 10篇 |
1996年 | 7篇 |
1995年 | 8篇 |
1994年 | 8篇 |
1993年 | 9篇 |
1992年 | 17篇 |
1991年 | 11篇 |
1990年 | 14篇 |
1989年 | 6篇 |
1988年 | 7篇 |
1987年 | 10篇 |
1986年 | 6篇 |
1985年 | 9篇 |
1984年 | 13篇 |
1983年 | 10篇 |
1982年 | 8篇 |
1981年 | 5篇 |
1979年 | 4篇 |
1978年 | 6篇 |
1976年 | 7篇 |
1975年 | 5篇 |
1974年 | 8篇 |
1971年 | 8篇 |
1969年 | 4篇 |
排序方式: 共有2325条查询结果,搜索用时 15 毫秒
91.
92.
93.
94.
95.
Exploring Biotic and Abiotic Determinants of Nest Size in Mediterranean Great Tits (Parus major) and Blue Tits (Cyanistes caeruleus)
下载免费PDF全文
![点击此处可从《Ethology : formerly Zeitschrift fur Tierpsychologie》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Marcel M. Lambrechts Jacques Blondel Cyril Bernard Samuel P. Caro Anne Charmantier Virginie Demeyrier Claire Doutrelant Gabrielle Dubuc‐Messier Amélie Fargevieille Christophe de Franceschi Pablo Giovannini Arnaud Grégoire Sylvie Hurtrez‐Boussès Annick Lucas Mark C. Mainwaring Pascal Marrot Adèle Mennerat Samuel Perret Philippe Perret 《Ethology : formerly Zeitschrift fur Tierpsychologie》2016,122(6):492-501
96.
97.
98.
Clément Pellegrin Yohann Daguerre Joske Ruytinx Frédéric Guinet Minna Kemppainen Nicolas Frei dit Frey Virginie Puech-Pagès Arnaud Hecker Alejandro G. Pardo Francis M. Martin Claire Veneault-Fourrey 《Environmental microbiology》2019,21(10):3765-3779
The ectomycorrhizal symbiosis is a predominant tree–microbe interaction in forest ecosystems sustaining tree growth and health. Its establishment and functioning implies a long-term and intimate relationship between the soil-borne fungi and the roots of trees. Mycorrhiza-induced Small-Secreted Proteins (MiSSPs) are hypothesized as keystone symbiotic proteins, required to set up the symbiosis by modifying the host metabolism and/or building the symbiotic interfaces. L. bicolor MiSSP8 is the third most highly induced MiSSPs in symbiotic tissues and it is also expressed in fruiting bodies. The MiSSP8-RNAi knockdown mutants are strongly impaired in their mycorrhization ability with Populus, with the lack of fungal mantle and Hartig net development due to the lack of hyphal aggregation. MiSSP8 C-terminus displays a repetitive motif containing a kexin cleavage site, recognized by KEX2 in vitro. This suggests MiSSP8 protein might be cleaved into small peptides. Moreover, the MiSSP8 repetitive motif is found in other proteins predicted secreted by both saprotrophic and ectomycorrhizal fungi. Thus, our data indicate that MiSSP8 is a small-secreted protein involved at early stages of ectomycorrhizal symbiosis, likely by regulating hyphal aggregation and pseudoparenchyma formation. 相似文献
99.
Malet H Egloff MP Selisko B Butcher RE Wright PJ Roberts M Gruez A Sulzenbacher G Vonrhein C Bricogne G Mackenzie JM Khromykh AA Davidson AD Canard B 《The Journal of biological chemistry》2007,282(14):10678-10689
Viruses of the family Flaviviridae are important human and animal pathogens. Among them, the Flaviviruses dengue (DENV) and West Nile (WNV) cause regular outbreaks with fatal outcomes. The RNA-dependent RNA polymerase (RdRp) activity of the non-structural protein 5 (NS5) is a key activity for viral RNA replication. In this study, crystal structures of enzymatically active and inactive WNV RdRp domains were determined at 3.0- and 2.35-A resolution, respectively. The determined structures were shown to be mostly similar to the RdRps of the Flaviviridae members hepatitis C and bovine viral diarrhea virus, although with unique elements characteristic for the WNV RdRp. Using a reverse genetic system, residues involved in putative interactions between the RNA-cap methyltransferase (MTase) and the RdRp domain of Flavivirus NS5 were identified. This allowed us to propose a model for the structure of the full-length WNV NS5 by in silico docking of the WNV MTase domain (modeled from our previously determined structure of the DENV MTase domain) onto the RdRp domain. The Flavivirus RdRp domain structure determined here should facilitate both the design of anti-Flavivirus drugs and structure-function studies of the Flavivirus replication complex in which the multifunctional NS5 protein plays a central role. 相似文献