全文获取类型
收费全文 | 986篇 |
免费 | 53篇 |
国内免费 | 47篇 |
专业分类
耳鼻咽喉 | 6篇 |
儿科学 | 35篇 |
妇产科学 | 35篇 |
基础医学 | 211篇 |
口腔科学 | 10篇 |
临床医学 | 29篇 |
内科学 | 190篇 |
皮肤病学 | 9篇 |
神经病学 | 136篇 |
特种医学 | 7篇 |
外科学 | 71篇 |
综合类 | 49篇 |
预防医学 | 43篇 |
眼科学 | 13篇 |
药学 | 85篇 |
中国医学 | 6篇 |
肿瘤学 | 151篇 |
出版年
2024年 | 8篇 |
2023年 | 23篇 |
2022年 | 61篇 |
2021年 | 77篇 |
2020年 | 56篇 |
2019年 | 49篇 |
2018年 | 76篇 |
2017年 | 57篇 |
2016年 | 63篇 |
2015年 | 75篇 |
2014年 | 102篇 |
2013年 | 90篇 |
2012年 | 59篇 |
2011年 | 98篇 |
2010年 | 44篇 |
2009年 | 42篇 |
2008年 | 31篇 |
2007年 | 25篇 |
2006年 | 31篇 |
2005年 | 5篇 |
2004年 | 10篇 |
2003年 | 3篇 |
2000年 | 1篇 |
排序方式: 共有1086条查询结果,搜索用时 15 毫秒
1.
Huili Li Katherine B. Chiappinelli Angela A. Guzzetta Hariharan Easwaran Ray-Whay Chiu Yen Rajita Vatapalli Michael J. Topper Jianjun Luo Roisin M. Connolly Nilofer S. Azad Vered Stearns Drew M. Pardoll Nancy Davidson Peter A. Jones Dennis J. Slamon Stephen B. Baylin Cynthia A. Zahnow Nita Ahuja 《Oncotarget》2014,5(3):587-598
Epigenetic therapy is emerging as a potential therapy for solid tumors. To investigate its mechanism of action, we performed integrative expression and methylation analysis of 63 cancer cell lines (breast, colorectal, and ovarian) after treatment with the DNA methyltransferase inhibitor 5-azacitidine (AZA). Gene Set Enrichment Analysis demonstrated significant enrichment for immunomodulatory pathways in all three cancers (14.4-31.3%) including interferon signaling, antigen processing and presentation, and cytokines/chemokines. Strong upregulation of cancer testis antigens was also observed. An AZA IMmune gene set (AIMs) derived from the union of these immunomodulatory pathway genes classified primary tumors from all three types into “high” and “low” AIM gene expression subsets in tumor expression data from both TCGA and GEO. Samples from selected patient biopsies showed upregulation of AIM genes after treatment with epigenetic therapy. These results point to a broad immune stimulatory role for DNA demethylating drugs in multiple cancers. 相似文献
2.
3.
DNA methylation represents an important link between structural genetic variation and complex phenotypes. The study of genome-wide CpG methylation and its relation to traits relevant to psychiatry has become increasingly important. Here, we analyzed quality metrics of 394,043 CpG sites in two samples of 568 and 319 mentally healthy young adults. For 25% of all CpGs we observed medium to large common epigenetic variation. These CpGs were overrepresented in open sea and shore regions, as well as in intergenic regions. They also showed a strong enrichment of significant hits in association analyses. Furthermore, a significant proportion of common DNA methylation is at least partially genetically driven and thus may be observed similarly across tissues. These findings could be of particular relevance for studies of complex neuropsychiatric traits, which often rely on proxy tissues. 相似文献
4.
5.
6.
7.
《Nutrition, metabolism, and cardiovascular diseases : NMCD》2022,32(6):1502-1510
Background and aimChildhood obesity is an emerging problem often leading to earlier onset of non-communicable diseases in later life. Biomarkers to identify individual risk scores are insufficient in routine clinical practice, which is related to the need for easily sampled, non-invasive survey methods in children. We aimed to investigate and strengthen possible pro-inflammatory markers and epigenetic risk factors in saliva of obese children compared to lean controls.Methods and results19 overweight/obese (OC, 10.1 ± 1.9 years, BMI 27.7 ± 3.2 kg/m2) and 19 lean control children (CC, 9.7 ± 2.5 years, BMI 16.4 ± 1.8 kg/m2) participated in this explorative pilot study. Anthropometric measures, saliva and cheek swab samples were taken. Saliva profiles were examined for acute phase proteins (CRP and neopterin) and pro-inflammatory cytokines (IL-17a/IL-1β/IL-6). Cheek swabs were analyzed to investigate DNA methylation differences with subsequent hierarchical cluster and principal component analyses (PCA). Saliva analysis showed significant increased CRP concentrations in OC compared to CC (p < 0.001). There were no significant differences, but high intra-individual values in neopterin, IL-17a, IL-1β and IL-6. An unsupervised PCA of CpG loci with high variance (σ/σmax > 0.2) clearly separated OC and CC according to their methylation pattern. Furthermore, a supervised approach revealed 7125 significantly differentially methylated loci, whose corresponding genes were significantly enriched for genes playing roles in e.g., cellular signalling, cytoskeleton organization and cell motility.ConclusionsCRP and methylation status determinations in saliva are suitable as non-invasive methods for early detection of risks for non-communicable diseases in children/adolescents and might be a useful supplementary approach in the routine clinical practice/monitoring. 相似文献
8.
9.
《Seminars in immunology》2013,25(4):313-320
One of the mechanisms that are in place to control the activation of mature T cells that bear self-reactive antigen receptors is anergy, a long-term state of hyporesponsiveness that is established in T cells in response to suboptimal stimulation. T cells receive signals that result not only from antigen recognition and costimulation but also from other sources, including cytokine receptors, inhibitory receptors or metabolic sensors. Integration of those signals will determine T cell fate. Under conditions that induce anergy, T cells activate a program of gene expression that leads to the production of proteins that block T cell receptor signaling and inhibit cytokine gene expression. In this review we will examine those signals that determine functional outcome following antigen encounter, review current knowledge of the factors that ensure signaling inhibition and epigenetic gene silencing in anergic cells and explore the mechanisms that lead to the reversal of anergy and the reacquisition of effector functions. 相似文献
10.