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   238797篇
  免费   7429篇
  国内免费   621篇
耳鼻咽喉   3113篇
儿科学   8862篇
妇产科学   7032篇
基础医学   31419篇
口腔科学   6299篇
临床医学   19990篇
内科学   44114篇
皮肤病学   5706篇
神经病学   16889篇
特种医学   11655篇
外国民族医学   97篇
外科学   32995篇
综合类   1456篇
一般理论   59篇
预防医学   21741篇
眼科学   4913篇
药学   16322篇
  2篇
中国医学   225篇
肿瘤学   13958篇
  2022年   1155篇
  2021年   2222篇
  2020年   1423篇
  2019年   1834篇
  2018年   5473篇
  2017年   5160篇
  2016年   4612篇
  2015年   6404篇
  2014年   6177篇
  2013年   5844篇
  2012年   13736篇
  2011年   8635篇
  2010年   4185篇
  2009年   5577篇
  2008年   4846篇
  2007年   5530篇
  2006年   5676篇
  2005年   13537篇
  2004年   14739篇
  2003年   10109篇
  2002年   5094篇
  2001年   4538篇
  2000年   1849篇
  1999年   6048篇
  1992年   6929篇
  1991年   7177篇
  1990年   7409篇
  1989年   7001篇
  1988年   6519篇
  1987年   6274篇
  1986年   5988篇
  1985年   5273篇
  1984年   3638篇
  1983年   2955篇
  1982年   1033篇
  1979年   3845篇
  1978年   2376篇
  1977年   1804篇
  1976年   1567篇
  1975年   2484篇
  1974年   3111篇
  1973年   2750篇
  1972年   2760篇
  1971年   2749篇
  1970年   2561篇
  1969年   2473篇
  1968年   2238篇
  1967年   2164篇
  1966年   1902篇
  1965年   1132篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
While previous randomised controlled trials and meta-analyses offer only limited evidence for the effectiveness of cognitive rehabilitation, qualitative studies examining patient perspectives report more positive outcomes. This meta-synthesis of qualitative studies examined patient perspectives of cognitive rehabilitation for memory, attention, and executive function problems in people with multiple sclerosis. Using set eligibility criteria, we screened electronic databases, reference lists, and academic networks for relevant papers. Seven papers (195 participants) were selected. Two independent researchers conducted quality appraisals of papers. Data analysis, guided by the thematic synthesis approach, yielded six main themes. These suggested that patients benefitted from the group environment in rehabilitation. Cognitive rehabilitation facilitated the participants’ reflection and awareness of their cognitive deficits, and was associated with increased knowledge and understanding of their illness. Increased strategy use was reported and associated with improvements in cognitive functioning and greater confidence and perseverance. Participants reported emotional and social improvements, and felt more optimistic. Overall, these changes had a positive impact on participants’ quality of life. This synthesis of qualitative studies indicates that people with multiple sclerosis who experience cognitive deficits benefit from cognitive rehabilitation programmes. This finding must, however, be viewed in light of the limitations of this meta-synthesis. The meta-synthesis was registered in the PROSPERO database under CRD42017040148.  相似文献   
6.
7.
Coxiella burnetii is an obligate intracellular Gram-negative bacterium that causes the zoonotic disease Q fever. Although Q fever is mainly transmitted by aerosol infection, study of the immune responses in the lung following pulmonary C. burnetii infection is lacking. Neutrophils are considered the first immune cell to migrate into the lung and play an important role in host defense against aerosol infection with microbial pathogens. However, the role of neutrophils in the host defense against C. burnetii infection remains unclear. To determine the role of neutrophils in protective immunity against C. burnetii infection, the RB6-8C5 antibody was used to deplete neutrophils in mice before intranasal infection with C. burnetii. The results indicated that neutrophil-depleted mice developed more severe disease than their wild-type counterparts, suggesting that neutrophils play an important role in host defense against C. burnetii pulmonary infection. We also found that neither CXC chemokine receptor 2 (CXCR2) nor interleukin-17 (IL-17) receptor (IL-17R) deficiency changed the severity of disease following intranasal C. burnetii challenge, suggesting that keratinocyte-derived chemokine and IL-17 may not play essential roles in the response to C. burnetii infection. However, significantly higher C. burnetii genome copy numbers were detected in the lungs of IL-1R−/− mice at 14 days postinfection. This indicates that IL-1 may be important for the clearance of C. burnetii from the lungs following intranasal infection. Our results also suggest that neutrophils are involved in protecting vaccinated mice from C. burnetii challenge-induced disease. This is the first study to demonstrate an important role for neutrophils in protective immunity against C. burnetii infection.  相似文献   
8.
9.
Behçet disease is a complex, multisystem disease characterized by recurrent oral and genital ulcerations. It rarely occurs in infants or children. Neonatal Behçet disease has been reported in infants whose ulcers resolve at or before 9 weeks of age. Few cases of neonatal Behçet disease persisting into childhood have previously been reported. We report the case of a 1‐month‐old infant who presented with severe recurrent genital ulcerations and at 6 months developed recurrent oral ulcerations. Her orogenital ulcerations continue to recur. Human leukocyte antigen testing revealed HLA‐B51 and B44 positivity. This is a case of pediatric Behçet disease in the neonatal period. Behçet disease should be considered in the differential diagnosis of recurrent genital and oral ulcerations in infants and children.  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