全文获取类型
收费全文 | 565篇 |
免费 | 50篇 |
国内免费 | 1篇 |
专业分类
616篇 |
出版年
2024年 | 1篇 |
2023年 | 5篇 |
2022年 | 15篇 |
2021年 | 25篇 |
2020年 | 7篇 |
2019年 | 20篇 |
2018年 | 17篇 |
2017年 | 15篇 |
2016年 | 20篇 |
2015年 | 48篇 |
2014年 | 47篇 |
2013年 | 51篇 |
2012年 | 54篇 |
2011年 | 29篇 |
2010年 | 27篇 |
2009年 | 31篇 |
2008年 | 30篇 |
2007年 | 29篇 |
2006年 | 32篇 |
2005年 | 25篇 |
2004年 | 19篇 |
2003年 | 15篇 |
2002年 | 10篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 1篇 |
1998年 | 4篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1992年 | 1篇 |
1988年 | 3篇 |
1987年 | 2篇 |
1983年 | 1篇 |
1980年 | 1篇 |
1960年 | 1篇 |
1957年 | 1篇 |
1956年 | 1篇 |
1955年 | 1篇 |
1947年 | 2篇 |
1946年 | 1篇 |
1937年 | 2篇 |
1934年 | 4篇 |
1933年 | 1篇 |
1931年 | 1篇 |
1929年 | 2篇 |
1928年 | 2篇 |
1926年 | 1篇 |
1925年 | 1篇 |
排序方式: 共有616条查询结果,搜索用时 15 毫秒
91.
Claudine Dherin Emeric Gueneau Mathilde Francin Marcela Nunez Simona Miron Sascha Emilie Liberti Lene Juel Rasmussen Sophie Zinn-Justin Bernard Gilquin Jean-Baptiste Charbonnier Serge Boiteux 《Molecular and cellular biology》2009,29(3):907-918
Mlh1 is an essential factor of mismatch repair (MMR) and meiotic recombination. It interacts through its C-terminal region with MutL homologs and proteins involved in DNA repair and replication. In this study, we identified the site of yeast Mlh1 critical for the interaction with Exo1, Ntg2, and Sgs1 proteins, designated as site S2 by reference to the Mlh1/Pms1 heterodimerization site S1. We show that site S2 is also involved in the interaction between human MLH1 and EXO1 or BLM. Binding at this site involves a common motif on Mlh1 partners that we called the MIP-box for the Mlh1 interacting protein box. Direct and specific interactions between yeast Mlh1 and peptides derived from Exo1, Ntg2, and Sgs1 and between human MLH1 and peptide derived from EXO1 and BLM were measured with Kd values ranging from 8.1 to 17.4 μM. In Saccharomyces cerevisiae, a mutant of Mlh1 targeted at site S2 (Mlh1-E682A) behaves as a hypomorphic form of Exo1. The site S2 in Mlh1 mediates Exo1 recruitment in order to optimize MMR-dependent mutation avoidance. Given the conservation of Mlh1 and Exo1 interaction, it may readily impact Mlh1-dependent functions such as cancer prevention in higher eukaryotes. 相似文献
92.
Actin-Depolymerizing Factor2-Mediated Actin Dynamics Are Essential for Root-Knot Nematode Infection of Arabidopsis 总被引:1,自引:0,他引:1
93.
94.
95.
96.
Thomas Pollet Mathilde Schapira Marie-Jeanne Buscot Sophie C Leterme James G Mitchell Laurent Seuront 《Aquatic biosystems》2010,6(1):1-6
The relation between climatic parameters (relative air humidity) and the water activity of the Urmia Sea water determines the possible maximum evaporation of the lake. Using the Pitzer thermodynamic approach, the activity of the Urmia Lake water during evaporation was calculated and compared to the present relative air humidity above the water. Present climatic conditions allow the Urmia Sea water to evaporate down to water with activity of 0.55, corresponding to the lowest air humidity measured over the lake. This water activity falls in the range of halite precipitation, while carnalite precipitation starts at somewhat lower (a H2O = 0.499) point. Our dynamic model predicts that for air humidity as low as 55% (reflecting present climate conditions), the Urmia Sea level may drop to as low as 1270 m (i. e., 1270 m above mean sea level). At that point, the lake water volume will have a volume of 11 km3. For the sake of comparison, at the beginning of 1990, the level of the lake was 1275 m, its volume was 25 km3, and its surface area was 5145 km2. 相似文献
97.
Rebecca Muckelbauer Lars Libuda Kerstin Clausen André M. Toschke Thomas Reinehr Mathilde Kersting 《Obesity (Silver Spring, Md.)》2010,18(3):528-534
We tested whether a simple overweight prevention program promoting water consumption in elementary schools is equally effective in children with an immigrational background (MIG) and in those without (non‐MIG). Thus, a secondary analysis of a controlled cluster trial, lasting one school year, was conducted. Thirty‐two elementary schools located in low socioeconomic districts in two German cities were included. Of the 2,950 school children analyzed, 1,306 were MIG children. Water fountains were installed in the schools of the intervention group (IG) and teachers held lessons to promote water consumption. Control schools (control group (CG)) did not receive any intervention. Before and after intervention, body weight and height was measured. Overweight was defined by age‐ and sex‐specific BMI cutoffs that are linked to an adult BMI of 25 kg/m2. Beverage consumption was assessed in questionnaires. Modification of intervention effects by immigrational background was tested by interaction terms. The immigrational background modified the intervention effect on prevalence and remission of overweight (interaction term: P = 0.03 and P = 0.02), but not on the incidence of overweight (P = 0.06). After intervention, the risk of being overweight was reduced in the IG compared to the CG among non‐MIG (odds ratio = 0.51, 95% confidence interval (CI): 0.31–0.83), but not among MIG children (odds ratio = 1.02, 95% CI: 0.63–1.65). After intervention, water consumption significantly increased in the IG equally among both, non‐MIG and MIG, by ~1 glass/day. A simple school‐based intervention promoting water consumption prevented overweight in non‐MIG children, but failed in MIG children. Different beverage consumption, among other lifestyle factors, may account for this effect but scientific discussion remains open. 相似文献
98.
Rogel A Vignard V Bobinet M Labarriere N Lang F 《Cancer immunology, immunotherapy : CII》2011,60(3):327-337
CD4+ T cells contribute importantly to the antitumor T cell response, and thus, long peptides comprising CD4 and CD8 epitopes
may be efficient cancer vaccines. We have previously identified an overexpressed antigen in melanoma, MELOE-1, presenting
a CD8+ T cell epitope, MELOE-136–44, in the HLA-A*0201 context. A T cell repertoire against this epitope is present in HLA-A*0201+ healthy subjects and melanoma
patients and the adjuvant injection of TIL containing MELOE-1 specific CD8+ T cells to melanoma patients was shown to be beneficial. In this study, we looked for CD4+ T cell epitopes in the vicinity of the HLA-A*0201 epitope. Stimulation of PBMC from healthy subjects with MELOE-126–46 revealed CD4 responses in multiple HLA contexts and by cloning responsive CD4+ T cells, we identified one HLA-DRβ1*1101-restricted and one HLA-DQβ1*0603-restricted epitope. We showed that the two epitopes
could be efficiently presented to CD4+ T cells by MELOE-1-loaded dendritic cells but not by MELOE-1+ melanoma cell-lines. Finally, we showed that the long peptide
MELOE-122–46, containing the two optimal class II epitopes and the HLA-A*0201 epitope, was efficiently processed by DC to stimulate CD4+ and CD8+ T cell responses in vitro, making it a potential candidate for melanoma vaccination. 相似文献
99.
This paper proposes a study of biological regulation networks based on a multi-level strategy. Given a network, the first structural level of this strategy consists in analysing the architecture of the network interactions in order to describe it. The second dynamical level consists in relating the patterns found in the architecture to the possible dynamical behaviours of the network. It is known that circuits are the patterns that play the most important part in the dynamics of a network in the sense that they are responsible for the diversity of its asymptotic behaviours. Here, we pursue further this idea and argue that beyond the influence of underlying circuits, intersections of circuits also impact significantly on the dynamics of a network and thus need to be payed special attention to. For some genetic regulation networks involved in the control of the immune system (“immunetworks”), we show that the small number of attractors can be explained by the presence, in the underlying structures of these networks, of intersecting circuits that “inter-lock”. 相似文献
100.
Saumonneau A Rottier K Conrad U Popineau Y Guéguen J Francin-Allami M 《Plant cell reports》2011,30(7):1289-1302
In wheat, the high-molecular weight (HMW) glutenin subunits are known to contribute to gluten viscoelasticity, and show some
similarities to elastomeric animal proteins as elastin. When combining the sequence of a glutenin with that of elastin is
a way to create new chimeric functional proteins, which could be expressed in plants. The sequence of a glutenin subunit was
modified by the insertion of several hydrophobic and elastic motifs derived from elastin (elastin-like peptide, ELP) into
the hydrophilic repetitive domain of the glutenin subunit to create a triblock protein, the objective being to improve the
mechanical (elastomeric) properties of this wheat storage protein. In this study, we investigated an expression model system
to analyze the expression and trafficking of the wild-type HMW glutenin subunit (GSW) and an HMW glutenin subunit mutated by the insertion of elastin motifs (GSM-ELP). For this purpose, a series of constructs was made to express wild-type subunits and subunits mutated by insertion of
elastin motifs in fusion with green fluorescent protein (GFP) in tobacco BY-2 cells. Our results showed for the first time
the expression of HMW glutenin fused with GFP in tobacco protoplasts. We also expressed and localized the chimeric protein
composed of plant glutenin and animal elastin-like peptides (ELP) in BY-2 protoplasts, and demonstrated its presence in protein
body-like structures in the endoplasmic reticulum. This work, therefore, provides a basis for heterologous production of the
glutenin-ELP triblock protein to characterize its mechanical properties. 相似文献