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排序方式: 共有273条查询结果,搜索用时 15 毫秒
121.
Farhat Y. Marston William H. Grainger Wiep Klaas Smits Nicholas H. Hopcroft Matthew Green Andrea M. Hounslow Alan D. Grossman C. Jeremy Craven Panos Soultanas 《Nucleic acids research》2010,38(20):6930-6942
DnaD and DnaB are essential DNA-replication-initiation proteins in low-G+C content Gram-positive bacteria. Here we use sensitive Hidden Markov Model-based techniques to show that the DnaB and DnaD proteins share a common structure that is evident across all their structural domains, termed DDBH1 and DDBH2 (DnaD DnaB Homology 1 and 2). Despite strong sequence divergence, many of the DNA-binding and oligomerization properties of these domains have been conserved. Although eluding simple sequence comparisons, the DDBH2 domains share the only strong sequence motif; an extremely highly conserved YxxxIxxxW sequence that contributes to DNA binding. Sequence alignments of DnaD alone fail to identify another key part of the DNA-binding module, since it includes a poorly conserved sequence, a solvent-exposed and somewhat unstable helix and a mobile segment. We show by NMR, in vitro mutagenesis and in vivo complementation experiments that the DNA-binding module of Bacillus subtilis DnaD comprises the YxxxIxxxW motif, the unstable helix and a portion of the mobile region, the latter two being essential for viability. These structural insights lead us to a re-evaluation of the oligomerization and DNA-binding properties of the DnaD and DnaB proteins. 相似文献
122.
Lingli Li Lucille Voullaire Chiranjeevi Sandi Mark A. Pook Panos A. Ioannou Martin B. Delatycki Joseph P. Sarsero 《PloS one》2013,8(2)
Friedreich ataxia (FRDA) is an autosomal recessive disorder characterized by neurodegeneration and cardiomyopathy. The presence of a GAA trinucleotide repeat expansion in the first intron of the FXN gene results in the inhibition of gene expression and an insufficiency of the mitochondrial protein frataxin. There is a correlation between expansion length, the amount of residual frataxin and the severity of disease. As the coding sequence is unaltered, pharmacological up-regulation of FXN expression may restore frataxin to therapeutic levels. To facilitate screening of compounds that modulate FXN expression in a physiologically relevant manner, we established a cellular genomic reporter assay consisting of a stable human cell line containing an FXN-EGFP fusion construct, in which the EGFP gene is fused in-frame with the entire normal human FXN gene present on a BAC clone. The cell line was used to establish a fluorometric cellular assay for use in high throughput screening (HTS) procedures. A small chemical library containing FDA-approved compounds and natural extracts was screened and analyzed. Compound hits identified by HTS were further evaluated by flow cytometry in the cellular genomic reporter assay. The effects on FXN mRNA and frataxin protein levels were measured in lymphoblast and fibroblast cell lines derived from individuals with FRDA and in a humanized GAA repeat expansion mouse model of FRDA. Compounds that were established to increase FXN gene expression and frataxin levels included several anti-cancer agents, the iron-chelator deferiprone and the phytoalexin resveratrol. 相似文献
123.
124.
Siu P. Ngok Rory Geyer Antonis Kourtidis Peter Storz Panos Z. Anastasiadis 《The Journal of biological chemistry》2013,288(9):6640-6650
Syx is a Rho-specific guanine nucleotide exchange factor (GEF) that localizes at cell-cell junctions and promotes junction stability by activating RhoA and the downstream effector Diaphanous homolog 1 (Dia1). Previously, we identified several molecules, including 14-3-3 proteins, as Syx-interacting partners. In the present study, we show that 14-3-3 isoforms interact with Syx at both its N- and C-terminal regions in a phosphorylation-dependent manner. We identify the protein kinase D-mediated phosphorylation of serine 92 on Syx, and additional phosphorylation at serine 938, as critical sites for 14-3-3 association. Our data indicate that the binding of 14-3-3 proteins inhibits the GEF activity of Syx. Furthermore, we show that phosphorylation-deficient, 14-3-3-uncoupled Syx exhibits increased junctional targeting and increased GEF activity, resulting in the strengthening of the circumferential junctional actin ring in Madin-Darby canine kidney cells. These findings reveal a novel means of regulating junctional Syx localization and function by phosphorylation-induced 14-3-3 binding and further support the importance of Syx function in maintaining stable cell-cell contacts. 相似文献
125.
Elin Grundberg Eshwar Meduri Johanna K. Sandling ?sa K. Hedman Sarah Keildson Alfonso Buil Stephan Busche Wei Yuan James Nisbet Magdalena Sekowska Alicja Wilk Amy Barrett Kerrin S. Small Bing Ge Maxime Caron So-Youn Shin the Multiple Tissue Human Expression Resource Consortium Mark Lathrop Emmanouil T. Dermitzakis Mark I. McCarthy Timothy D. Spector Jordana T. Bell Panos Deloukas 《American journal of human genetics》2013,93(6):1158
126.
Justus C. Dachsel Siu P. Ngok Laura J. Lewis-Tuffin Antonis Kourtidis Rory Geyer Lauren Johnston Ryan Feathers Panos Z. Anastasiadis 《Molecular and cellular biology》2013,33(24):4909-4918
The role of RhoA in promoting directed cell migration has been complicated by studies showing that it is activated both in the front and the rear of migrating cells. We report here that the RhoA-specific guanine nucleotide exchange factor Syx is required for the polarity of actively migrating brain and breast tumor cells. This function of Syx is mediated by the selective activation of the RhoA downstream effector Dia1, the subsequent reorganization of microtubules, and the downregulation of focal adhesions and actin stress fibers. The data argue that directed cell migration requires the precise spatiotemporal regulation of Dia1 and ROCK activities in the cell. The recruitment of Syx to the cell membrane and the subsequent selective activation of Dia1 signaling, coupled with the suppression of ROCK and activation of cofilin-mediated actin reorganization, plays a key role in establishing cell polarity during directed cell migration. 相似文献
127.
Day-Williams AG Southam L Panoutsopoulou K Rayner NW Esko T Estrada K Helgadottir HT Hofman A Ingvarsson T Jonsson H Keis A Kerkhof HJ Thorleifsson G Arden NK Carr A Chapman K Deloukas P Loughlin J McCaskie A Ollier WE Ralston SH Spector TD Wallis GA Wilkinson JM Aslam N Birell F Carluke I Joseph J Rai A Reed M Walker K;arcOGEN Consortium Doherty SA Jonsdottir I Maciewicz RA Muir KR Metspalu A Rivadeneira F Stefansson K Styrkarsdottir U Uitterlinden AG van Meurs JB Zhang W Valdes AM Doherty M 《American journal of human genetics》2011,(3):446-450
Osteoarthritis (OA) is a prevalent, heritable degenerative joint disease with a substantial public health impact. We used a 1000-Genomes-Project-based imputation in a genome-wide association scan for osteoarthritis (3177 OA cases and 4894 controls) to detect a previously unidentified risk locus. We discovered a small disease-associated set of variants on chromosome 13. Through large-scale replication, we establish a robust association with SNPs in MCF2L (rs11842874, combined odds ratio [95% confidence interval] 1.17 [1.11–1.23], p = 2.1 × 10−8) across a total of 19,041 OA cases and 24,504 controls of European descent. This risk locus represents the third established signal for OA overall. MCF2L regulates a nerve growth factor (NGF), and treatment with a humanized monoclonal antibody against NGF is associated with reduction in pain and improvement in function for knee OA patients. 相似文献
128.
Stathopoulou MG Dedoussis GV Trovas G Theodoraki EV Katsalira A Dontas IA Hammond N Deloukas P Lyritis GP 《The Journal of nutritional biochemistry》2011,22(8):752-757
The aim of this study was to investigate the effect of common vitamin D receptor (VDR) gene polymorphisms on the bone mineral density (BMD) of Greek postmenopausal women. Healthy postmenopausal women (n=578) were recruited for the study. The BMD of the lumbar spine and hip was measured using dual-energy X-ray absorptiometry with the Lunar DPX-MD device. Assessment of dietary calcium intake was performed with multiple 24-h recalls. Genotyping was performed for the BsmI, TaqI and Cdx-2 polymorphisms of the VDR gene. The selected polymorphisms were not associated with BMD, osteoporosis or osteoporotic fractures. Stratification by calcium intake revealed that in the low calcium intake group (<680 mg/day), all polymorphisms were associated with the BMD of the lumbar spine (P<.05). After adjustment for potential covariates, BsmI and TaqI polymorphisms were associated with the presence of osteoporosis (P<.05), while the presence of the minor A allele of Cdx-2 polymorphism was associated with a lower spine BMD (P=.025). In the higher calcium intake group (>680 mg/day), no significant differences were observed within the genotypes for all polymorphisms. The VDR gene is shown to affect BMD in women with low calcium intake, while its effect is masked in women with higher calcium intake. This result underlines the significance of adequate calcium intake in postmenopausal women, given that it exerts a positive effect on BMD even in the presence of negative genetic predisposition. 相似文献
129.
James M. Noble Nikolaos Scarmeas Romanita S. Celenti Mitchell S. V. Elkind Clinton B. Wright Nicole Schupf Panos N. Papapanou 《PloS one》2014,9(12)
Background
Periodontitis and Alzheimer disease (AD) are associated with systemic inflammation. This research studied serum IgG to periodontal microbiota as possible predictors of incident AD.Methods
Using a case-cohort study design, 219 subjects (110 incident AD cases and 109 controls without incident cognitive impairment at last follow-up), matched on race-ethnicity, were drawn from the Washington Heights-Inwood Columbia Aging Project (WHICAP), a cohort of longitudinally followed northern Manhattan residents aged >65 years. Mean follow-up was five years (SD 2.6). In baseline sera, serum IgG levels were determined for bacteria known to be positively or negatively associated with periodontitis (Porphyromonas gingivalis, Tannerella forsythia, Actinobacillus actinomycetemcomitans Y4, Treponema denticola, Campylobacter rectus, Eubacterium nodatum, and Actinomyces naeslundii genospecies-2). In all analyses, we used antibody threshold levels shown to correlate with presence of moderate-severe periodontitis.Results
Mean age was 72 years (SD 6.9) for controls, and 79 years (SD 4.6) for cases (p<0.001). Non-Hispanic Whites comprised 26%, non-Hispanic Blacks 27%, and Hispanics 48% of the sample. In a model adjusting for baseline age, sex, education, diabetes mellitus, hypertension, smoking, prior history of stroke, and apolipoprotein E genotype, high anti-A. naeslundii titer (>640 ng/ml, present in 10% of subjects) was associated with increased risk of AD (HR = 2.0, 95%CI: 1.1–3.8). This association was stronger after adjusting for other significant titers (HR = 3.1, 95%CI: 1.5–6.4). In this model, high anti-E. nodatum IgG (>1755 ng/ml; 19% of subjects) was associated with lower risk of AD (HR = 0.5, 95%CI: 0.2–0.9).Conclusions
Serum IgG levels to common periodontal microbiota are associated with risk for developing incident AD. 相似文献130.
Rotival M Zeller T Wild PS Maouche S Szymczak S Schillert A Castagné R Deiseroth A Proust C Brocheton J Godefroy T Perret C Germain M Eleftheriadis M Sinning CR Schnabel RB Lubos E Lackner KJ Rossmann H Münzel T Rendon A;Cardiogenics Consortium Erdmann J Deloukas P Hengstenberg C Diemert P Montalescot G Ouwehand WH Samani NJ Schunkert H Tregouet DA Ziegler A Goodall AH Cambien F Tiret L Blankenberg S 《PLoS genetics》2011,7(12):e1002367