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   2911685篇
  免费   223116篇
  国内免费   32368篇
耳鼻咽喉   36966篇
儿科学   89472篇
妇产科学   75497篇
基础医学   398232篇
口腔科学   75375篇
临床医学   281936篇
内科学   554095篇
皮肤病学   66168篇
神经病学   228180篇
特种医学   112854篇
外国民族医学   960篇
外科学   415072篇
综合类   118954篇
现状与发展   91篇
一般理论   993篇
预防医学   219744篇
眼科学   66487篇
药学   225942篇
  425篇
中国医学   29242篇
肿瘤学   170484篇
  2021年   33089篇
  2020年   26431篇
  2019年   31860篇
  2018年   40865篇
  2017年   33866篇
  2016年   36447篇
  2015年   45686篇
  2014年   60703篇
  2013年   78689篇
  2012年   107341篇
  2011年   115137篇
  2010年   71773篇
  2009年   66001篇
  2008年   99446篇
  2007年   103947篇
  2006年   104733篇
  2005年   100075篇
  2004年   90549篇
  2003年   87463篇
  2002年   82575篇
  2001年   135588篇
  2000年   138316篇
  1999年   117264篇
  1998年   34574篇
  1997年   30991篇
  1996年   30183篇
  1995年   30818篇
  1994年   27942篇
  1993年   25199篇
  1992年   87146篇
  1991年   83400篇
  1990年   80310篇
  1989年   77365篇
  1988年   70511篇
  1987年   68915篇
  1986年   64295篇
  1985年   61029篇
  1984年   45195篇
  1983年   38070篇
  1982年   22483篇
  1979年   38993篇
  1978年   27421篇
  1977年   23203篇
  1976年   21445篇
  1975年   22779篇
  1974年   26769篇
  1973年   25353篇
  1972年   23761篇
  1971年   21948篇
  1970年   20168篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
Modified-release opioids are often prescribed for the management of moderate to severe acute pain following total hip and knee arthroplasty, despite recommendations against their use due to increasing concerns regarding harm. The primary objective of this multicentre study was to examine the impact of modified-release opioid use on the incidence of opioid-related adverse events compared with immediate-release opioid use, among adult inpatients following total hip or knee arthroplasty. Data for total hip and knee arthroplasty inpatients receiving an opioid analgesic for postoperative analgesia during hospitalisation were collected from electronic medical records of three tertiary metropolitan hospitals in Australia. The primary outcome was the incidence of opioid-related adverse events during hospital admission. Patients who received modified with or without immediate-release opioids were matched to those receiving immediate-release opioids only (1:1) using nearest neighbour propensity score matching with patient and clinical characteristics as covariates. This included total opioid dose received. In the matched cohorts, patients given modified-release opioids (n = 347) experienced a higher incidence of opioid-related adverse events overall, compared with those given immediate-release opioids only (20.5%, 71/347 vs. 12.7%, 44/347; difference in proportions 7.8% [95%CI 2.3–13.3%]). Modified-release opioid use was associated with an increased risk of harm when used for acute pain during hospitalisation after total hip or knee arthroplasty.  相似文献   
2.
3.
目的 探讨集束化干预策略联合闭环管理模式对ICU多重耐药菌感染的防控效果。方法选取2020年1~12月EICU住院患者275例作为对照组,实施常规管理;2021年1~10月EICU住院患者239例作为观察组,在常规管理基础上实施集束化干预策略联合闭环管理。结果实施后,观察组多重耐药菌感染发生率明显低于对照组;患者住院日显著低于对照组,4项护理措施执行率(隔离标识、手卫生、环境消毒、医务人员相关知识知晓)、病原学送检率显著高于对照组(均P<0.05)。结论集束化干预联合信息化闭环管理可有效降低EICU多重耐药菌感染发生率。  相似文献   
4.
Huo  Jia  Fu  Lijun  Jin  Mengyuan  Li  Zhaoming  Zhang  Mingzhi 《Investigational new drugs》2022,40(3):537-545
Investigational New Drugs - Background&nbsp;Chemotherapy resistance is a main reason for treatment failure in extranodal NK/T-cell lymphoma (ENKTL). Interleukin-10 (IL-10) is closely related to...  相似文献   
5.
Pharmaceutical Chemistry Journal - Cyclin-dependent kinases 4 and 6 (CDK4/6) are the core part of the cell cycle control machinery, which bind to cyclin D to regulate cell G1-S cycle conversion....  相似文献   
6.
7.
8.
Neuroscience and Behavioral Physiology - We present here results from analysis of the formation of brain bioelectrical activity in children and adolescents living in the northern region of Russia...  相似文献   
9.
10.
Recent epidemiological studies suggested that proton pump inhibitor (PPI) use was associated with an increased risk of biliary tract cancer (BTC), however, confounders were not adequately controlled. Our study aimed to evaluate PPI use and subsequent risk of BTC and its subtypes in three well-established cohorts. We conducted a pooled analysis of the subjects free of cancers in UK Biobank (n = 463 643), Nurses' Health Study (NHS, n = 80 235) and NHS II (n = 95 869). Propensity score weighted Cox models were used to estimate marginal HRs of PPIs use on BTC risk, accounting for potential confounders. We documented 284 BTC cases in UK Biobank (median follow-up: 7.6 years), and 91 cases in NHS and NHS II cohorts (median follow-up: 15.8 years). In UK biobank, PPI users had a 96% higher risk of BTC compared to nonusers in crude model (HR 1.96, 95% CI 1.44-2.66), but the effect was attenuated to null after adjusting for potential confounders (HR 0.95, 95% CI 0.60-1.49). PPI use was not associated with risk of BTC in the pooled analysis of three cohorts (HR 0.93, 95% CI 0.60-1.43). We also observed no associations between PPI use with risk of intrahepatic (HR 1.00, 95% CI 0.49-2.04), extrahepatic bile duct (HR 1.09, 95% CI 0.52-2.27) and gallbladder cancers (HR 0.66, 95% CI 0.26-1.66) in UK Biobank. In summary, regular use of PPIs was not associated with the risk of BTC and its subtypes.  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