首页 | 官方网站   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   101818篇
  免费   6695篇
  国内免费   769篇
医药卫生   109282篇
  2023年   394篇
  2022年   402篇
  2021年   1728篇
  2020年   1247篇
  2019年   1758篇
  2018年   2182篇
  2017年   1694篇
  2016年   1817篇
  2015年   2123篇
  2014年   2779篇
  2013年   4043篇
  2012年   5550篇
  2011年   5696篇
  2010年   3750篇
  2009年   3258篇
  2008年   5092篇
  2007年   5328篇
  2006年   5102篇
  2005年   4900篇
  2004年   5104篇
  2003年   4892篇
  2002年   4969篇
  2001年   3787篇
  2000年   3666篇
  1999年   2972篇
  1998年   1072篇
  1997年   854篇
  1996年   746篇
  1995年   824篇
  1994年   705篇
  1993年   709篇
  1992年   1774篇
  1991年   1774篇
  1990年   1492篇
  1989年   1451篇
  1988年   1324篇
  1987年   1190篇
  1986年   1172篇
  1985年   1039篇
  1984年   766篇
  1983年   699篇
  1982年   456篇
  1981年   389篇
  1979年   564篇
  1978年   414篇
  1975年   432篇
  1974年   480篇
  1973年   460篇
  1972年   422篇
  1971年   394篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
Die Anaesthesiologie - Der Mangel an automatischen externen Defibrillatoren (AED) und die fehlende Kenntnis von Ersthelfern im Umgang mit diesen Geräten haben in Deutschland zu einer...  相似文献   
3.
Cardiovascular Drugs and Therapy - Available animal models of acute heart failure (AHF) and their limitations are discussed herein. A novel and preclinically relevant porcine model of decompensated...  相似文献   
4.
5.
An increased number of patients is at risk of Candida spp. bloodstream infection (CBSI) in modern medicine. Moreover, the rising of antifungal resistance (AR) was recently reported. All consecutive CBSI occurred in our Hospital (consisting of 1,370 beds) between 2015 and 2018, were reviewed. For each case, Candida species, AR pattern, ward involved and demographic data of patients were recorded. Overall, 304 episodes of CBSI occurred, with a median (q1:first-,q3:third quartile) of 77 (71-82) CBSI/year. Over the years, a significant increase of CBSI due to C. albicans compared to non-albicans strains was recorded in medical wards (from 65% to 71%, p=0.030), while this ratio remained stable in others. An increase of resistant strains to multiple antifungals such as C. guillermondii was noticed in recent years (from 0% to 9.8%, p=0.008). Additionally, from 2015 to 2018 an increase in fluconazole-resistance was recorded in our Hospital (from 7.4% to 17.4%, p=0.025) and a slight increase in voriconazole-resistance (from 0% to 7% in 2018, p=0.161) was observed, while resistance to echinocandin and amphotericin B remained firmly below 2%.This study suggests a rapid spread of antifungal resistance in our Hospital; therefore, an appropriate antifungal stewardship programs is urgently warranted.  相似文献   
6.
7.
8.
Integrase strand transfer inhibitors (InSTIs) have been widely used in recent years because of their high genetic barrier to resistance. The World Health Organization (WHO) has recommended dolutegravir (DTG)-containing regimens as the preferred first- and second-line antiretroviral therapy (ART) regimens for people living with human immunodeficiency virus (HIV)[1]. During the long-term treatment process, the appearance of drug resistance mutations to InSTIs is inevitable. A meta-analysis has shown that the resistance rate among InSTI treatment-experienced patients is 3.9% (Raltegravir, RAL), 1.2% (Elvitegravir, EVG), and 0.1% (DTG)[2]. However, resistance to InSTIs has not been reported in treatment-naive populations.  相似文献   
9.
BackgroundContrast associated-acute kidney injury (CA-AKI) has been associated with adverse outcomes after ST-segment elevation myocardial infarction (STEMI). However, early markers of CA-AKI are still needed to improve risk stratification. We investigated the association between elevated serum uric acid (eSUA) and CA-AKI in patients with STEMI treated with primary percutaneous coronary intervention (pPCI).Methods and resultsSerum creatinine (Scr) was measured at admission and 24, 48 and 72 h after pPCI. CA-AKI was defined as an increase of 25% (CA-AKI 25%) or 0.5 mg/dl (CA-AKI 0.5) of Scr level above the baseline after 48 h following contrast administration. Multivariable analyses to investigate CA-AKI predictors were performed by binary logistic regression and multivariable backward logistic regression model.In the 3023 patients considered, CA-AKI was more frequent among patients with eSUA as compared with patients with normal SUA levels, considering both CA-AKI definitions (CA-AKI25%: 20.8% vs 16.2%, p < 0.012; CA-AKI 0.5: 10.1% vs 5.8%, p < 0.001). The association between eSUA and CA-AKI was confirmed at multivariable analyses (CA-AKI 25%: odd ratio 1.32, 95% CI 1.03–1.69, p = 0.027; CA-AKI 0.5: odd ratio 1.76, 95% CI 1.11–2.79, p = 0.016).ConclusionElevated serum uric acid is associated with CA-AKI after reperfusion in patients with STEMI treated with pPCI.  相似文献   
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-23

京公网安备 11010802026262号