首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   18204篇
  免费   1092篇
  国内免费   51篇
耳鼻咽喉   114篇
儿科学   529篇
妇产科学   370篇
基础医学   2943篇
口腔科学   202篇
临床医学   1758篇
内科学   3825篇
皮肤病学   454篇
神经病学   1719篇
特种医学   693篇
外国民族医学   4篇
外科学   2228篇
综合类   159篇
一般理论   3篇
预防医学   1528篇
眼科学   264篇
药学   1108篇
中国医学   68篇
肿瘤学   1378篇
  2023年   80篇
  2022年   136篇
  2021年   324篇
  2020年   203篇
  2019年   336篇
  2018年   557篇
  2017年   356篇
  2016年   418篇
  2015年   477篇
  2014年   584篇
  2013年   751篇
  2012年   1354篇
  2011年   1330篇
  2010年   688篇
  2009年   667篇
  2008年   1162篇
  2007年   1245篇
  2006年   1220篇
  2005年   1166篇
  2004年   1088篇
  2003年   1026篇
  2002年   894篇
  2001年   267篇
  2000年   254篇
  1999年   181篇
  1998年   167篇
  1997年   118篇
  1996年   106篇
  1995年   105篇
  1994年   80篇
  1993年   104篇
  1992年   87篇
  1991年   94篇
  1990年   103篇
  1989年   91篇
  1988年   100篇
  1987年   87篇
  1986年   119篇
  1985年   114篇
  1984年   85篇
  1983年   72篇
  1982年   48篇
  1981年   59篇
  1980年   57篇
  1979年   54篇
  1978年   56篇
  1976年   42篇
  1974年   40篇
  1973年   49篇
  1969年   38篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
European Radiology - The strongest adverse prognostic factor in myxoid/round cell liposarcomas (MRC-LPS) is the presence of a round cell component above 5% within the tumor bulk. Its identification...  相似文献   
2.
3.
4.
5.
Graefe's Archive for Clinical and Experimental Ophthalmology -  相似文献   
6.
Ovarian carcinoma is one of the most lethal malignancies, but only very few prognostic biomarkers are known. The degradome, comprising proteases, protease non-proteolytic homologues and inhibitors, have been involved in the prognosis of many cancer types, including ovarian carcinoma. The prognostic significance of the whole degradome family has not been specifically studied in high-grade serous ovarian cancer. A targeted DNA microarray known as the CLIP-CHIP microarray was used to identify potential prognostic factors in ten high-grade serous ovarian cancer women who had early recurrence (<1.6 years) or late/no recurrence after first line surgery and chemotherapy. In women with early recurrence, we identified seven upregulated genes (TMPRSS4, MASP1/3, SPC18, PSMB1, IGFBP2, CFI – encoding Complement Factor I – and MMP9) and one down-regulated gene (ADAM-10). Using immunohistochemistry, we evaluated the prognostic effect of these 8 candidate genes in an independent cohort of 112 high-grade serous ovarian cancer women. Outcomes were progression, defined according to CA-125 criteria, and death. Multivariate Cox proportional hazard regression models were done to estimate the associations between each protein and each outcome. High ADAM-10 expression (intensity of 2–3) was associated with a lower risk of progression (adjusted hazard ratio (HR): 0.51; 95% confidence interval (CI): 0.29-0.87). High complement factor I expression (intensity 2–3) was associated with a higher risk of progression (adjusted HR: 2.30, 95% CI: 1.17–4.53) and death (adjusted HR: 3.42; 95% CI: 1.72–6.79). Overall, we identified the prognostic value of two proteases, ADAM-10 and complement factor I, for high-grade serous ovarian cancer which could have clinical significance.  相似文献   
7.

Background

The ZOE-50 (NCT01165177) and ZOE-70 (NCT01165229) phase 3 clinical trials showed that the adjuvanted recombinant zoster vaccine (RZV) was ≥90% efficacious in preventing herpes zoster in adults. Here we present a comprehensive overview of the safety data from these studies.

Methods

Adults aged ≥50 (ZOE-50) and ≥70 (ZOE-70) years were randomly vaccinated with RZV or placebo. Safety analyses were performed on the pooled total vaccinated cohort, consisting of participants receiving at least one dose of RZV or placebo. Solicited and unsolicited adverse events (AEs) were collected for 7 and 30?days after each vaccination, respectively. Serious AEs (SAEs) were collected from the first vaccination until 12?months post-last dose. Fatal AEs, vaccination-related SAEs, and potential immune-mediated diseases (pIMDs) were collected during the entire study period.

Results

Safety was evaluated in 14,645 RZV and 14,660 placebo recipients. More RZV than placebo recipients reported unsolicited AEs (50.5% versus 32.0%); the difference was driven by transient injection site and solicited systemic reactions that were generally seen in the first week post-vaccination. The occurrence of overall SAEs (RZV: 10.1%; Placebo: 10.4%), fatal AEs (RZV: 4.3%; Placebo: 4.6%), and pIMDs (RZV: 1.2%; Placebo: 1.4%) was balanced between groups. The occurrence of possible exacerbations of pIMDs was rare and similar between groups. Overall, except for the expected local and systemic symptoms, the safety results were comparable between the RZV and Placebo groups irrespective of participant age, gender, or race.

Conclusions

No safety concerns arose, supporting the favorable benefit-risk profile of RZV.  相似文献   
8.
We evaluated RNA stability of Ebola virus in EDTA blood and urine samples collected from infected patients and stored in West Africa’s environmental conditions. In blood, RNA was stable for at least 18 days when initial cycle threshold values were <30, but in urine, RNA degradation occurred more quickly.  相似文献   
9.
10.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号