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   1595篇
  免费   80篇
  国内免费   16篇
耳鼻咽喉   35篇
儿科学   59篇
妇产科学   64篇
基础医学   151篇
口腔科学   32篇
临床医学   143篇
内科学   442篇
皮肤病学   44篇
神经病学   76篇
特种医学   79篇
外科学   319篇
综合类   27篇
一般理论   1篇
预防医学   35篇
眼科学   47篇
药学   56篇
中国医学   4篇
肿瘤学   77篇
  2023年   8篇
  2022年   20篇
  2021年   33篇
  2020年   26篇
  2019年   36篇
  2018年   46篇
  2017年   39篇
  2016年   56篇
  2015年   64篇
  2014年   100篇
  2013年   125篇
  2012年   154篇
  2011年   118篇
  2010年   70篇
  2009年   47篇
  2008年   92篇
  2007年   103篇
  2006年   90篇
  2005年   98篇
  2004年   88篇
  2003年   83篇
  2002年   50篇
  2001年   19篇
  2000年   15篇
  1999年   8篇
  1998年   6篇
  1997年   5篇
  1996年   9篇
  1995年   5篇
  1994年   4篇
  1993年   7篇
  1992年   3篇
  1990年   5篇
  1989年   6篇
  1988年   8篇
  1987年   6篇
  1986年   4篇
  1985年   6篇
  1984年   5篇
  1983年   2篇
  1978年   1篇
  1975年   1篇
  1974年   2篇
  1972年   2篇
  1971年   3篇
  1970年   5篇
  1967年   1篇
  1966年   1篇
  1959年   1篇
  1937年   1篇
排序方式: 共有1691条查询结果,搜索用时 296 毫秒
31.
Pituitary - Our aim was to investigate the changes in the composition of oral and gut microbiota in patients with newly diagnosed acromegaly and their relationship with IGF-1 levels. Oral and fecal...  相似文献   
32.
Our aim was to investigate the effects of hyaluronan on inflammatory cytokines in the synovial fluid of patients with knee osteoarthritis. The study was single blind, placebo-controlled, and randomized. We administered hyaluronan to 22 patients in the study group and placebo to 19 in the control group. Enzyme-linked immunosorbent assay was used to determine the levels of cytokines. Both HA and placebo caused a significant decrease in interleukin (IL)-6 levels (P=0.0001 and P=0.04, respectively). But it was more significant in the study group. However, IL-8 and tumor necrosis factor alpha (TNF-) levels did not change in either group (P>0.05). The amount of effusion decreased significantly in the study group (P=0.001) but not in the control group (P=0.133). It can be concluded that hyaluronan considerably decreased IL-6 levels, which correlated with clinical improvement, but had no effect on IL-8 and TNF- levels in synovial fluid. However, larger studies with longer follow-up periods are needed to explain the effect of hyaluronan on cytokines.  相似文献   
33.

Purpose

Primary immunodeficiency diseases (PIDs) are inherited disorders of the immune system resulting in increased susceptibility to unusual infections and predisposition to autoimmunity and malignancies. The European Society for Immunodeficiencies (ESID) has developed an internet-based database for clinical and research data on patients with PID. This study aimed to provide a minimum estimate of the prevalence of each disorder and to determine the clinical characteristics and outcomes of patients with PID in Turkey.

Methods

Clinical features of 1435 patients with primary immunodeficiency disorders are registered in ESID Online Patient Registry by the Pediatric Immunology Departments of the Medical Faculties of Uludag University and Ege University Between 2004 and 2010. These two centers are the major contributors reporting PID patients to ESID database from Turkey.

Results

Predominantly antibody immunodeficiency (73.5 %) was the most common category followed by autoinflammatory disorders (13.3 %), other well defined immunodeficiencies (5.5 %), congenital defects of phagocyte number, function or both 3.5 %), combined T and B cell immunodeficiencies (2 %), defects in innate immunity (1 %), and diseases of immune dysregulation (0.7 %). Patients between 0 and 18 years of age constitued 94 % of total and the mean age was 9.2?±?6 years. The consanguinity rate within the registered patients was 14.3 % (188 of 1130 patients). The prevalance of all PID cases ascertained from the registry was 30.5/100.000. The major cause of the mortality was severe infection which was seen in forty-two of seventy five deceased patients. The highest mortality was observed in patients with severe combined immunodeficiencies and ataxia-telangiectasia.

Conclusion

Promoting the awareness of PID among the medical professionals and the general public is required if premature death and serious morbidity occurs due to late diagnosis of the wider spectrum of PID are to be avoided.  相似文献   
34.
Annals of Nuclear Medicine - Pulmonary embolism is a severe source of mortality and morbidity in patients with severe and critical coronavirus disease 2019. It is not yet clear whether the tendency...  相似文献   
35.
36.
37.
Trigger finger (TF) is a condition that affects quality of life and one of the most common causes of hand pain and disability. TF is characterized by catching, snapping or locking of the involved finger flexor tendon, associated with pain. TF in the children occurs rarely than in adults and partial tendon laceration is an uncommon cause of TF in the children. Thus, our aim in this study to define TF due to partial flexor tendon laceration in a child.

Electronic supplementary material

The online version of this article (doi:10.1007/s12593-015-0180-8) contains supplementary material, which is available to authorized users.  相似文献   
38.
We evaluated the short-term results of percutaneous excimer laser angioplasty in acute myocardial infarction. Of the 18 patients studied, 2 were female and 16 male with a mean age of 56.6 +/- 12.1 years. Thrombolysis in myocardial infarction grades 0, 1, and 2 flow was observed in 10, 5, and 3 cases, respectively, prior to the procedure. The degree of stenosis was 97.9% +/- 5.1%. The lesion was crossed with a laser catheter in all cases, using a mean number of 808 +/- 384 laser pulses. Type C dissection developed in only 1 case (6%). Except for this case, distal flow was grade 3 in all the patients. Following the procedure, ST segment resolution exceeding 70% was achieved in 14 cases (78%) within the first 90 minutes. The success rate of laser ablation was 94% (17 patients). Stent implantation was performed in all the cases. In conclusion, laser angioplasty is an effective and reliable treatment for acute myocardial infarction.  相似文献   
39.
A high-resolution physical map of human chromosome 11.   总被引:7,自引:0,他引:7       下载免费PDF全文
The development of a highly reliable physical map with landmark sites spaced an average of 100 kbp apart has been a central goal of the Human Genome Project. We have approached the physical mapping of human chromosome 11 with this goal as a primary target. We have focused on strategies that would utilize yeast artificial chromosome (YAC) technology, thus permitting long-range coverage of hundreds of kilobases of genomic DNA, yet we sought to minimize the ambiguities inherent in the use of this technology, particularly the occurrence of chimeric genomic DNA clones. This was achieved through the development of a chromosome 11-specific YAC library from a human somatic cell hybrid line that has retained chromosome 11 as its sole human component.To maximize the efficiency of YAC contig assembly and extension, we have employed an Alu-PCR-based hybridization screening system. This system eliminates many of the more costly and time-consuming steps associated with sequence tagged site content mapping such as sequencing, primer production, and hierarchical screening, resulting in greater efficiency with increased throughput and reduced cost. Using these approaches, we have achieved YAC coverage for >90% of human chromosome 11, with an average intermarker distance of <100 kbp. Cytogenetic localization has been determined for each contig by fluorescent in situ hybridization and/or sequence tagged site content. The YAC contigs that we have generated should provide a robust framework to move forward to sequence-ready templates for the sequencing efforts of the Human Genome Project as well as more focused positional cloning on chromosome 11.  相似文献   
40.
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