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   14614篇
  免费   950篇
  国内免费   92篇
耳鼻咽喉   131篇
儿科学   318篇
妇产科学   875篇
基础医学   1863篇
口腔科学   310篇
临床医学   1648篇
内科学   3050篇
皮肤病学   276篇
神经病学   1131篇
特种医学   419篇
外科学   1975篇
综合类   281篇
一般理论   8篇
预防医学   753篇
眼科学   423篇
药学   1049篇
中国医学   125篇
肿瘤学   1021篇
  2023年   56篇
  2022年   44篇
  2021年   311篇
  2020年   154篇
  2019年   308篇
  2018年   413篇
  2017年   251篇
  2016年   280篇
  2015年   441篇
  2014年   534篇
  2013年   750篇
  2012年   1099篇
  2011年   1167篇
  2010年   743篇
  2009年   600篇
  2008年   863篇
  2007年   863篇
  2006年   829篇
  2005年   796篇
  2004年   724篇
  2003年   636篇
  2002年   608篇
  2001年   549篇
  2000年   524篇
  1999年   369篇
  1998年   94篇
  1997年   88篇
  1996年   80篇
  1995年   78篇
  1994年   66篇
  1993年   54篇
  1992年   179篇
  1991年   152篇
  1990年   116篇
  1989年   112篇
  1988年   105篇
  1987年   82篇
  1986年   71篇
  1985年   62篇
  1984年   46篇
  1983年   32篇
  1982年   25篇
  1981年   23篇
  1980年   18篇
  1979年   42篇
  1978年   24篇
  1977年   22篇
  1976年   20篇
  1975年   24篇
  1973年   25篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
23.
The Cerebellum - Mutations in STUB1 have been identified to cause autosomal recessive spinocerebellar ataxia type 16 (SCAR16), also named as Gordon Holmes syndrome, which is characterized by...  相似文献   
24.
Cancer Chemotherapy and Pharmacology - CC-486 is an oral formulation of azacitidine that allows for extended dosing schedules to prolong azacitidine exposure to malignant cells and maximize...  相似文献   
25.
26.
Multidisciplinary predialysis education and team care (MDC) may slow the decline in renal function in patients with chronic kidney disease (CKD). However, associations between unexpected return during MDC and progression of renal dysfunction have not been characterized in patients with CKD. Our study aimed to determine the association between exacerbation of renal dysfunction and the frequency of unexpected return during follow-up.A total of 437 patients with CKD receiving multidisciplinary care between January 2009 and June 2013 at the Shin-Kong Wu Ho-Su Memorial Hospital were included in this retrospective observational cohort study, and multiple imputations were performed for missing data. The predictor was the frequency of unexpected return for follow-up during the first year after entering MDC. Main outcome was monthly declines in estimated glomerular filtration rates (eGFR). Moreover, the demographic data, comorbidities, history of medication, and routine laboratory data for patients with CKD were collected.Among all patients, 59.7% were male, the mean age at initiation of MDC was 69.4 ± 13.2 years, and the duration of follow-up was 21.4 ± 3.3 months. The subjects were divided into 2 groups according to frequencies of follow-up (≤4 and > 4 visits) during the 1st year of MDC. The patients with CKD were regularly followed up every 3 months as a part of MDC in our hospital, and patients who returned for more than 4 follow-up visits were included in the unexpected return group. In crude regression analyses, unexpected return was significantly associated with higher monthly declines of eGFR (β = 0.092, 95% confidence interval, 0.014–0.170). This association remained after adjustments for multiple variables, and subgroup analyses of unexpected return showed that male gender, older age, CKD stage 1 to 3, hypertension, history of coronary artery disease, and use of renin–angiotensin system blockade were significantly associated with declines in renal function.In conclusion, unexpected return for follow-up during the 1st year of MDC was significantly associated with the deterioration of renal function.  相似文献   
27.
The primary objective of this study was to determine the association between the use of gastric acid suppressants (GAS) and the risk of developing spontaneous bacterial peritonitis (SBP) in patients with advanced liver cirrhosis (LC).A case–control study nested within a cohort of 480,000 representatives of Taiwan National Health Insurance beneficiaries was carried out. A case was matched with 100 controls on age, gender, and index date of SBP diagnosis. GAS use was identified from the 1-year period before the index date. Conditional logistic regression analysis was used to adjust for various unbalanced covariates between users and nonusers of GAS.A total of 947 cases of SBP were identified among the 86,418 patients with advanced LC. A significant increased risk of developing SBP was found to be associated with current (within 30 days), and recent (within 30–90 day) use of 2 different classes of GAS: proton pump inhibitors (PPIs) and histamine 2 receptor antagonists (H2RAs). The confounder adjusted rate ratio (aRR) for the current use of PPIs was 2.77 (95%CI: 1.90–4.04) and H2RAs was 2.62 (95%CI: 2.00–3.42). The risk of SBP attenuated for the recent use of PPIs (aRR: 2.20, 95%CI: 1.60–3.02) or H2RAs (aRR: 1.72, 95%CI: 1.25–2.37).In addition, sensitivity analysis using hospitalized SBP as the primary outcome showed a similar risk for the current use of PPIs (aRR, 3.24; 95%CI: 2.08–5.05) and H2RAs (aRR 2.43; 95%CI 1.71–3.46). Furthermore, higher cumulative days of gastric acid suppression were associated with a higher risk of SBP (trend P < 0.0001).To conclude, exposure to GAS was associated with an increased risk of SBP in patients with advanced LC. The association was more pronounced in current PPI users compared with nonusers.  相似文献   
28.
29.
30.
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