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   3006篇
  免费   266篇
  国内免费   123篇
耳鼻咽喉   18篇
儿科学   79篇
妇产科学   9篇
基础医学   295篇
口腔科学   63篇
临床医学   346篇
内科学   422篇
皮肤病学   73篇
神经病学   121篇
特种医学   104篇
外科学   237篇
综合类   385篇
预防医学   480篇
眼科学   62篇
药学   413篇
  7篇
中国医学   169篇
肿瘤学   112篇
  2024年   14篇
  2023年   63篇
  2022年   134篇
  2021年   213篇
  2020年   245篇
  2019年   98篇
  2018年   118篇
  2017年   129篇
  2016年   126篇
  2015年   145篇
  2014年   164篇
  2013年   242篇
  2012年   140篇
  2011年   145篇
  2010年   118篇
  2009年   117篇
  2008年   120篇
  2007年   111篇
  2006年   119篇
  2005年   106篇
  2004年   102篇
  2003年   74篇
  2002年   59篇
  2001年   54篇
  2000年   44篇
  1999年   42篇
  1998年   34篇
  1997年   33篇
  1996年   37篇
  1995年   22篇
  1994年   23篇
  1993年   33篇
  1992年   31篇
  1991年   18篇
  1990年   18篇
  1989年   22篇
  1988年   12篇
  1987年   16篇
  1986年   10篇
  1985年   7篇
  1984年   8篇
  1983年   3篇
  1982年   6篇
  1981年   3篇
  1980年   7篇
  1979年   1篇
  1978年   3篇
  1976年   5篇
  1975年   1篇
排序方式: 共有3395条查询结果,搜索用时 31 毫秒
1.
This paper describes country-wide special measures undertaken for interventional radiology staff during the current coronavirus disease 2019 (COVID-19) pandemic. Although each interventional radiology service around the world faces unique challenges, the principles outlined in this article will be useful when designing or strengthening individual practices and integrating them within wider hospital and national measures. Moving beyond the current outbreak, these measures will be useful for any future infectious diseases which are likely to arise.  相似文献   
2.
ABSTRACT

Purpose

Work-related eye injuries have been reported with a variety of epidemiologic and clinical characteristics. We aimed to identify epidemiologic characteristics of work-related eye injuries and risk factors associated with severe injury in a large metropolitan city.  相似文献   
3.
《Immunity》2022,55(8):1343-1353
  相似文献   
4.
Worldwide, researchers routinely study children indirectly through adults who act as proxies for such children. The call for researchers to rather study children directly and adopt less intrusive child-friendly methodologies has become louder. The draw-and-write technique is regarded as a less intrusive child-friendly method of collecting data that can be used for this purpose. This paper reports the findings of a qualitative study that sought to establish the feasibility of the draw-and-write technique in exploring the resilience of children orphaned by AIDS. This study involved a convenience sample of 23 IsiXhosa-speaking orphaned children aged from 13 to 17. The participants were in grades 6 to 10 and they resided in two child and youth care centres in the Eastern Cape province of South Africa. As part of the draw-and-write technique the participants were asked to make drawings of what enabled them to cope with their lives and to write short narratives in which they explained their drawings. Inductive content analysis was used to analyse the data and this process yielded two main themes, namely: personal protective resources and socio-ecological protective resources. The findings show that complex combinations of personal and socio-ecological resilience resources enabled the resilience of the orphaned children. The findings challenge researchers not to be oblivious to alternative child-friendly methods of research such as the draw-and-write technique when young people are the unit of analysis. The findings of this study have implications for research as well as practice in the field of education and psychology.  相似文献   
5.
6.
7.
中风毒邪论是一种与传统中医中风病理有所不同的理论 ,在中风毒邪论指导下形成解毒通络方是较为理想的神经保护剂 ,可解决目前神经保护治疗的主要障碍 ,有望成为提高中医治疗中风急性期疗效的关键  相似文献   
8.
铅防护服的性能检测与分析   总被引:1,自引:0,他引:1  
铅防护服用于放射诊断与治疗中医护人员和患者的X射线防护。透视和拍片可以用于检查铅防护服裂缝、开线和破洞等破损状况。通过建立铅防护服的淘汰标准,定期检测、科学更新,保证最佳的放射安全。  相似文献   
9.
Studies have demonstrated that lipid rafts ultimately regulate the endocytosis of anthrax toxin via clathrin dependent pathway. Interestingly, GPI-anchored protein rich rafts have also been shown to be transported down to the endocytic pathway to reducing late endosomes. Taking advantage of this parallelism, we tried translating the anthrax toxin natural intoxication mechanism by administering a DNA chimera that encoded protective antigen attached to a mammalian GPI-anchor sequence at its C-terminus (pGPI-PA63). We also designed a chimera that had an additional N-terminal TPA leader sequence (pTPA.GPI-PA63) with an aim to target GPI-PA63 to ER where new CD1 molecules are synthesized. Analysis of antibody titers demonstrated successful priming and potential IgG titers after the first boost. In vitro cell proliferation studies in the presence of GPI-attached PA63 peptides revealed that there was a clonal expansion of CD4+ NK1.1+ helper T cell population which rapidly produced IL-4 in response to T cell receptor ligation. These cells provided direct B cell help that aided IgG formation. Effector responses generated by NKT cells were found to be MHC II-independent and CD1d-restricted. In addition, the group pTPA.GPI-PA63 also displayed low magnitude MHC-II restricted (CD1d-independent) NKT cell and CD4+ T cell helper responses in response to non-GPI attached PA63 peptides which overall resulted in the heightened responses seen for this group. Importantly, DNA vaccination mediated the generation of high avidity neutralizing antibodies that mediated protection against lethal toxin challenge.  相似文献   
10.
This study investigated the relationship of protective factors (PF) to adult adaptation in a nonclinical sample consisting of 264 undergraduate women: two groups without childhood sexual abuse (CSA), high (n = 109) and low (n = 99) on PF; and two groups with CSA, high (n = 17) and low (n = 27) on PF. The first hypothesis that higher levels of PF would be significantly associated with higher levels of functioning for all individuals was supported by the data. The second hypothesis that the women with CSA and higher levels of PF would appear similar in adaptation to those without CSA was also supported. The findings further suggest that though the protective factors were beneficial for most individuals, they were significantly more helpful for those with CSA.  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