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   98115篇
  免费   8442篇
  国内免费   4131篇
耳鼻咽喉   1269篇
儿科学   1234篇
妇产科学   2042篇
基础医学   13550篇
口腔科学   2163篇
临床医学   10021篇
内科学   17701篇
皮肤病学   1885篇
神经病学   6281篇
特种医学   3323篇
外国民族医学   29篇
外科学   11862篇
综合类   10108篇
现状与发展   8篇
一般理论   13篇
预防医学   5982篇
眼科学   2440篇
药学   9464篇
  45篇
中国医学   3057篇
肿瘤学   8211篇
  2024年   130篇
  2023年   859篇
  2022年   1973篇
  2021年   2661篇
  2020年   1954篇
  2019年   2176篇
  2018年   2816篇
  2017年   2365篇
  2016年   2234篇
  2015年   3037篇
  2014年   3767篇
  2013年   3933篇
  2012年   5564篇
  2011年   5732篇
  2010年   3565篇
  2009年   2983篇
  2008年   4274篇
  2007年   4305篇
  2006年   4191篇
  2005年   3863篇
  2004年   3047篇
  2003年   2887篇
  2002年   2637篇
  2001年   5705篇
  2000年   5568篇
  1999年   4916篇
  1998年   1978篇
  1997年   1563篇
  1996年   1067篇
  1995年   896篇
  1994年   831篇
  1993年   649篇
  1992年   2310篇
  1991年   2000篇
  1990年   1799篇
  1989年   1695篇
  1988年   1508篇
  1987年   1356篇
  1986年   1202篇
  1985年   1035篇
  1984年   673篇
  1983年   514篇
  1982年   275篇
  1981年   218篇
  1980年   161篇
  1979年   313篇
  1978年   101篇
  1974年   89篇
  1973年   119篇
  1972年   83篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.

Background and aims

Since accelerated atherosclerosis has been reported in systemic lupus erythematosus (SLE), predictive biomarkers of cardiovascular disease (CVD) are needed. Among non-traditional risk factors, bone mineral density (BMD) has been related to CVD. However, its role in SLE remains controversial. This study aims to analyze the associations of subclinical atherosclerosis with traditional and non-traditional CV risk factors.

Methods and results

In a cross-sectional study, atherosclerosis burden was compared between 112 female SLE patients and 31 controls. Plaque number and carotid intima-media wall thickness (cIMT) were assessed by ultrasonography. In a retrospective study, BMD determinations obtained 5-years before the ultrasonography assessment were analyzed in a subgroup of 62 patients. Plaque frequency was increased in SLE, even in patients without CV events or carotid wall thickening. cIMT was increased in patients with CVD, positively correlated with body mass index (BMI). Interestingly, a paradoxical effect of BMI on carotid parameters was observed. Whereas underweight patients (BMI < 20) showed increased prevalence of carotid plaques with low cIMT, those with BMI > 30 showed higher cIMT and plaque burden. Overweight patients (25 < BMI<30) exhibited both elevated cIMT and plaque number. BMI was an independent predictor of BMD. In our retrospective study, patients with either clinical or subclinical CVD exhibited lower BMD levels than their CV-free counterparts. A low lumbar spine BMD independently predicted CVD development after adjusting for confounders.

Conclusion

SLE was associated with a higher subclinical atherosclerosis burden, a bimodal effect being observed for BMI. Decreased BMD can be a CV risk biomarker in SLE.  相似文献   
4.
5.
Levels of the soluble form of the triggering receptor expressed on myeloid cells (sTREM)-1 are elevated in severe sepsis. However, it is not known whether sTREM-1 measurements can distinguish milder bacterial infections from noninfectious inflammation. The present authors studied whether serum sTREM-1 levels differ in community-acquired pneumonia, exacerbations of chronic obstructive pulmonary disease (COPD), asthma and controls, and whether sTREM-1 may be used as a surrogate marker for the need for antibiotics. Serum sTREM-1 levels in 150 patients with pneumonia, COPD and asthma exacerbations and 62 healthy controls were measured. Serum sTREM-1 levels were significantly elevated in pneumonia (median 295.2 ng x mL(-1)), COPD (280.3 ng x mL(-1)) and asthma exacerbations (184.0 ng x mL(-1)) compared with controls (83.1 ng x mL(-1)). Levels were higher in pneumonia and Anthonisen type 1 COPD exacerbations than in type 2 and 3 COPD and asthma exacerbations. The area under the receiver operating characteristics curve for sTREM-1 as a surrogate marker for the need for antibiotics was 0.77. Serum levels of the soluble form of the triggering receptor expressed on myeloid cells-1 were elevated predominantly in pneumonia and Anthonisen type 1 COPD exacerbations versus type 2 and 3 chronic obstructive pulmonary disease exacerbations, asthma and controls. Serum levels of the soluble form of the triggering receptor expressed on myeloid cells-1 has moderate but insufficient accuracy as a surrogate marker for the need for antibiotics in lower respiratory tract infections.  相似文献   
6.
目的 探讨Lugol液染色对食管早期癌和癌前病变的诊断价值。方法 对45例食管黏膜可疑病变经内镜以2%Lugol液喷洒染色,观察黏膜染色情况,并取活检送病理组织学检查。结果 45例食管病变染色后,39例呈浅染色或不染色,其中食管癌8例(食管早期癌5例,进展期癌3例),Barrett食管5例,轻至中度不典型增生1l例。本组Lugol液染色对食管早期癌和癌前病变的检出率达46.7%。结论 内镜下应用Lugol液染色结合活检有助于食管早期癌和癌前病变的诊断,且操作简便,具有重要的临床价值。  相似文献   
7.
在颈椎前路减压、植骨、带锁钢板内固定技术日渐成熟的今天,越来越多的医院开展了该项手术。自1998年2月-2005年8月应用该方法治疗颈椎病215例,发生与内置物钢板及钛网相关的并发症14例,为此积累了一定的经验,现总结如下。1临床资料本组215例,男126例,女89例;年龄42~82岁,平均  相似文献   
8.
循证护理在临床实习教学中的尝试   总被引:4,自引:0,他引:4  
苏芙蓉 《护理研究》2006,20(7):1967-1968
循证护理(evidence based nursing,EBN),直译为“以证据为基础的护理”,指护理人员在护理实践中将科研结论与病人需求相结合,考虑当时护理环境,结合个人经验,最终做出护理决策,其核心内容是运用现有最好的科学证据为服务对象提供服务。循证护理是20世纪90年代随着循证医学的发展而发展起来的,是一种新概念,新观点,新思维。经调整发现我市实习护生对循证护理了解甚少。  相似文献   
9.
10.
Membrane-bound CD14 acts as a receptor for lipopolysaccharide (LPS) on monocytes/macrophages and neutrophils. Studies have suggested that the activation of monocytes/macrophages by the binding of LPS to membrane-bound CD14 may require the association of a signal-transducing molecule with membrane-bound CD14. The observation that non-CD14 expressing cells, such as endothelial cells, can nevertheless be activated by a complex of LPS and a soluble form of CD14 (sCD14) suggests that the receptor for this complex may be identical to the signal transducing molecule associated with membrane-bound CD14. The studies described show that two CD14-specific MoAb are able to block the LPS-induced activation of endothelial cells but do not affect the response of monocytes to LPS. This suggests that the interaction of the sCD14:LPS complex with endothelial cells is distinct from the interaction of membrane-bound CD14 with its putative signal-transducing molecule.  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