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   242188篇
  免费   11952篇
  国内免费   396篇
耳鼻咽喉   3192篇
儿科学   7609篇
妇产科学   4977篇
基础医学   34841篇
口腔科学   5630篇
临床医学   19212篇
内科学   53139篇
皮肤病学   6432篇
神经病学   21636篇
特种医学   7542篇
外国民族医学   106篇
外科学   30385篇
综合类   1012篇
一般理论   65篇
预防医学   21575篇
眼科学   4903篇
药学   17014篇
中国医学   717篇
肿瘤学   14549篇
  2023年   1285篇
  2022年   876篇
  2021年   3527篇
  2020年   2099篇
  2019年   3954篇
  2018年   7606篇
  2017年   5028篇
  2016年   5068篇
  2015年   5612篇
  2014年   5888篇
  2013年   9448篇
  2012年   16453篇
  2011年   16364篇
  2010年   8153篇
  2009年   6056篇
  2008年   14063篇
  2007年   15055篇
  2006年   13885篇
  2005年   13737篇
  2004年   12912篇
  2003年   11783篇
  2002年   11206篇
  2001年   6439篇
  2000年   6571篇
  1999年   5817篇
  1998年   953篇
  1997年   784篇
  1996年   762篇
  1992年   3338篇
  1991年   2995篇
  1990年   2872篇
  1989年   2619篇
  1988年   2507篇
  1987年   2324篇
  1986年   2228篇
  1985年   2024篇
  1984年   1493篇
  1983年   1281篇
  1982年   727篇
  1979年   1338篇
  1978年   920篇
  1977年   870篇
  1975年   857篇
  1974年   1051篇
  1973年   1073篇
  1972年   1000篇
  1971年   983篇
  1970年   925篇
  1969年   958篇
  1968年   854篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
43.
44.
45.
Graefe's Archive for Clinical and Experimental Ophthalmology -  相似文献   
46.
47.
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   
48.
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   
49.
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