全文获取类型
收费全文 | 2688篇 |
免费 | 181篇 |
专业分类
2869篇 |
出版年
2024年 | 4篇 |
2023年 | 19篇 |
2022年 | 46篇 |
2021年 | 93篇 |
2020年 | 46篇 |
2019年 | 67篇 |
2018年 | 89篇 |
2017年 | 76篇 |
2016年 | 108篇 |
2015年 | 162篇 |
2014年 | 210篇 |
2013年 | 225篇 |
2012年 | 303篇 |
2011年 | 254篇 |
2010年 | 156篇 |
2009年 | 139篇 |
2008年 | 135篇 |
2007年 | 145篇 |
2006年 | 119篇 |
2005年 | 106篇 |
2004年 | 94篇 |
2003年 | 78篇 |
2002年 | 67篇 |
2001年 | 13篇 |
2000年 | 6篇 |
1999年 | 17篇 |
1998年 | 10篇 |
1997年 | 6篇 |
1996年 | 6篇 |
1995年 | 2篇 |
1994年 | 7篇 |
1993年 | 15篇 |
1992年 | 1篇 |
1991年 | 7篇 |
1990年 | 4篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 3篇 |
1983年 | 1篇 |
1982年 | 6篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1974年 | 3篇 |
1972年 | 1篇 |
1970年 | 3篇 |
1969年 | 3篇 |
1967年 | 1篇 |
排序方式: 共有2869条查询结果,搜索用时 15 毫秒
111.
Castellani Valentina Sanyé-Mengual Esther Sala Serenella 《The International Journal of Life Cycle Assessment》2021,26(10):2040-2055
The International Journal of Life Cycle Assessment - Current patterns of household goods consumption generate relevant environmental pressures and impacts. Environmental impacts are not only... 相似文献
112.
Giovanna Carr Paolo Nicoli Marcello Francesco Lingua Beatrice Maffeo Antonio Cartell Paola Circosta Mara Brancaccio Guido Parvis Valentina Gaidano Angelo Guerrasio Giuseppe Saglio Riccardo Taulli Alessandro Morotti 《Journal of cellular and molecular medicine》2020,24(2):1650-1657
The development of drugs able to target BTK, PI3k‐delta and BCL2 has dramatically improved chronic lymphocytic leukaemia (CLL) therapies. However, drug resistance to these therapies has already been reported due to non‐recurrent changes in oncogenic pathways and genes expression signatures. In this study, we investigated the cooperative role of the BCL2 inhibitor venetoclax and the BRD4 inhibitor JQ1. In particular, we found that JQ1 shows additional activity with venetoclax, in CLL cell lines and in ex vivo isolated primary CD19+ lymphocytes, arguing in favour of combination strategies. Lastly, JQ1 is also effective in venetoclax‐resistant CLL cell lines. Together, our findings indicated that the BET inhibitor JQ1 could be a promising therapy in CLL, both as first‐line therapy in combination with venetoclax and as second‐line therapy, after the emergence of venetoclax‐resistant clones. 相似文献
113.
Giuseppe Donati Marco Campera Michela Balestri Marta Barresi Kristina Kesch Kelard Ndremifidy Jonhy Rabenantoandro Elena Racevska Faly Randriatafika Murielle Ravaolahy Andriamandranto M. Ravoahangy Marika Roma Fiona Rowe Luca Santini Valentina Serra Stacey L. Zander Cedric Tsagnangara Manon Vincelette Jean-Baptiste Ramanamanjato 《American journal of primatology》2020,82(4):e23106
While the drivers of primate persistence in forest fragments have been often considered at the population level, the strategies to persist in these habitats have been little investigated at the individual or group level. Considering the rapid variation of fragment characteristics over time, longitudinal data on primates living in fragmented habitats are necessary to understand the key elements for their persistence. Since translocated animals have to cope with unfamiliar areas and face unknown fluctuations in food abundance, they offer the opportunity to study the factors contributing to successful migration between fragments. Here, we illustrated the evolution of the foraging strategies of translocated collared brown lemurs (Eulemur collaris) over an 18-year period in the Mandena Conservation Zone, south-east Madagascar. Our aim was to explore the ability of these frugivorous lemurs to adjust to recently colonized fragmented forests. Although the lemurs remained mainly frugivorous throughout the study period, over the years we identified a reduction in the consumption of leaves and exotic/pioneer plant species. These adjustments were expected in frugivorous primates living in a degraded area, but we hypothesize that they may also reflect the initial need to cope with an unfamiliar environment after the translocation. Since fragmentation is often associated with the loss of large trees and native vegetation, we suggest that the availability of exotic and/or pioneer plant species can provide an easy-to-access, nonseasonal food resource and be a key factor for persistence during the initial stage of the recolonization. 相似文献
114.
115.
116.
Valentina Mengoli Katarzyna Jonak Oleksii Lyzak Mahdi Lamb Lisa M Lister Chris Lodge Julie Rojas Ievgeniia Zagoriy Mary Herbert Wolfgang Zachariae 《The EMBO journal》2021,40(7)
Genome haploidization involves sequential loss of cohesin from chromosome arms and centromeres during two meiotic divisions. At centromeres, cohesin''s Rec8 subunit is protected from separase cleavage at meiosis I and then deprotected to allow its cleavage at meiosis II. Protection of centromeric cohesin by shugoshin‐PP2A seems evolutionarily conserved. However, deprotection has been proposed to rely on spindle forces separating the Rec8 protector from cohesin at metaphase II in mammalian oocytes and on APC/C‐dependent destruction of the protector at anaphase II in yeast. Here, we have activated APC/C in the absence of sister kinetochore biorientation at meiosis II in yeast and mouse oocytes, and find that bipolar spindle forces are dispensable for sister centromere separation in both systems. Furthermore, we show that at least in yeast, protection of Rec8 by shugoshin and inhibition of separase by securin are both required for the stability of centromeric cohesin at metaphase II. Our data imply that related mechanisms preserve the integrity of dyad chromosomes during the short metaphase II of yeast and the prolonged metaphase II arrest of mammalian oocytes. 相似文献
117.
C Fusco L Micale M Egorov M Monti EV D'Addetta B Augello F Cozzolino A Calcagnì A Fontana RS Polishchuk G Didelot A Reymond P Pucci G Merla 《PloS one》2012,7(7):e40440
In this study we report that, in response to proteasome inhibition, the E3-Ubiquitin ligase TRIM50 localizes to and promotes the recruitment and aggregation of polyubiquitinated proteins to the aggresome. Using Hdac6-deficient mouse embryo fibroblasts (MEF) we show that this localization is mediated by the histone deacetylase 6, HDAC6. Whereas Trim50-deficient MEFs allow pinpointing that the TRIM50 ubiquitin-ligase regulates the clearance of polyubiquitinated proteins localized to the aggresome. Finally we demonstrate that TRIM50 colocalizes, interacts with and increases the level of p62, a multifunctional adaptor protein implicated in various cellular processes including the autophagy clearance of polyubiquitinated protein aggregates. We speculate that when the proteasome activity is impaired, TRIM50 fails to drive its substrates to the proteasome-mediated degradation, and promotes their storage in the aggresome for successive clearance. 相似文献
118.
119.
120.
The neuron-specific Rai (ShcC) adaptor protein inhibits apoptosis by coupling Ret to the phosphatidylinositol 3-kinase/Akt signaling pathway 总被引:2,自引:0,他引:2 下载免费PDF全文
Pelicci G Troglio F Bodini A Melillo RM Pettirossi V Coda L De Giuseppe A Santoro M Pelicci PG 《Molecular and cellular biology》2002,22(20):7351-7363
Rai is a recently identified member of the family of Shc-like proteins, which are cytoplasmic signal transducers characterized by the unique PTB-CH1-SH2 modular organization. Rai expression is restricted to neuronal cells and regulates in vivo the number of postmitotic sympathetic neurons. We report here that Rai is not a common substrate of receptor tyrosine kinases under physiological conditions and that among the analyzed receptors (Ret, epidermal growth factor receptor, and TrkA) it is activated specifically by Ret. Overexpression of Rai in neuronal cell lines promoted survival by reducing apoptosis both under conditions of limited availability of the Ret ligand glial cell line-derived neurotrophic factor (GDNF) and in the absence of Ret activation. Overexpressed Rai resulted in the potentiation of the Ret-dependent activation of phosphatidylinositol 3-kinase (PI3K) and Akt. Notably, increased Akt phosphorylation and PI3K activity were also found under basal conditions, e.g., in serum-starved neuronal cells. Phosphorylated and hypophosphorylated Rai proteins form a constitutive complex with the p85 subunit of PI3K: upon Ret triggering, the Rai-PI3K complex is recruited to the tyrosine-phosphorylated Ret receptor through the binding of the Rai PTB domain to tyrosine 1062 of Ret. In neurons treated with low concentrations of GDNF, the prosurvival effect of Rai depends on Rai phosphorylation and Ret activation. In the absence of Ret activation, the prosurvival effect of Rai is, instead, phosphorylation independent. Finally, we showed that overexpression of Rai, at variance with Shc, had no effects on the early peak of mitogen-activated protein kinase (MAPK) activation, whereas it increased its activation at later time points. Phosphorylated Rai, however, was not found in complexes with Grb2. We propose that Rai potentiates the MAPK and PI3K signaling pathways and regulates Ret-dependent and -independent survival signals. 相似文献