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   247842篇
  免费   12214篇
  国内免费   468篇
耳鼻咽喉   3199篇
儿科学   7685篇
妇产科学   5094篇
基础医学   36137篇
口腔科学   5808篇
临床医学   19472篇
内科学   54506篇
皮肤病学   6557篇
神经病学   22166篇
特种医学   7652篇
外国民族医学   101篇
外科学   30846篇
综合类   1053篇
一般理论   67篇
预防医学   22561篇
眼科学   4792篇
药学   17447篇
中国医学   735篇
肿瘤学   14646篇
  2023年   1305篇
  2022年   1013篇
  2021年   3728篇
  2020年   2239篇
  2019年   4148篇
  2018年   7820篇
  2017年   5159篇
  2016年   5172篇
  2015年   5821篇
  2014年   6106篇
  2013年   9773篇
  2012年   16730篇
  2011年   16797篇
  2010年   8420篇
  2009年   6397篇
  2008年   14331篇
  2007年   15284篇
  2006年   14118篇
  2005年   14013篇
  2004年   13109篇
  2003年   11939篇
  2002年   11284篇
  2001年   6507篇
  2000年   6590篇
  1999年   5825篇
  1998年   1034篇
  1997年   819篇
  1996年   773篇
  1992年   3340篇
  1991年   3014篇
  1990年   2886篇
  1989年   2671篇
  1988年   2530篇
  1987年   2344篇
  1986年   2253篇
  1985年   2027篇
  1984年   1507篇
  1983年   1270篇
  1982年   719篇
  1979年   1292篇
  1978年   920篇
  1977年   864篇
  1975年   852篇
  1974年   1052篇
  1973年   1065篇
  1972年   998篇
  1971年   981篇
  1970年   911篇
  1969年   967篇
  1968年   833篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
46.
Graefe's Archive for Clinical and Experimental Ophthalmology -  相似文献   
47.
48.
Annals of Nuclear Medicine - Cardiac amyloidosis is a rare disease characterized by amyloid heart deposits and is usually a part of systemic amyloidosis, in relation to systemic light chain (AL)...  相似文献   
49.
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   
50.

Objectives

To determine the incidence of incisional hernia (IH) in the extraction incision (EI) in colorectal resection for cancer. To analyze whether the location of the incision has any relationship with the incidence of hernias and whether mesh could be useful for prevention in high-risk patients.

Methods

Retrospective review of the colon and rectal surgery database from January 2015 to December 2016. Data were classified into 2 groups, transverse (TI) and midline incision (MI), and the latter was divided into 2 subgroups (mesh [MIM] and suture [MIS]). Patients were classified using the HERNIAscore. Hernias were diagnosed by clinical and/or CT examination.

Results

A total of 182 out of 210 surgical patients were included. After a median follow-up of 13.0 months, 39 IH (21.9%) were detected, 23 of which (13.4%) were in the EI; their frequency was lower in the TI group (3.4%) and in the MIM group (5.9%) than in the MIS group (29.5%; p = 0.007). The probability of developing IH in the MIS group showed an OR = 11.7 (95%CI: 3.3-42.0) compared to the TI group and 4.3 (IC 95%: 1.1-16.3) versus the MIM group.

Conclusions

The location of the incision is relevant to avoid incisional hernias. Transverse incisions should be used as the first option. When a midline incision is needed, a prophylactic mesh could be considered in high risk patients because it is safe and associated with low morbidity.  相似文献   
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