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   3790篇
  免费   237篇
  国内免费   8篇
耳鼻咽喉   66篇
儿科学   124篇
妇产科学   73篇
基础医学   471篇
口腔科学   96篇
临床医学   391篇
内科学   701篇
皮肤病学   87篇
神经病学   289篇
特种医学   97篇
外科学   534篇
综合类   67篇
一般理论   2篇
预防医学   459篇
眼科学   66篇
药学   288篇
中国医学   5篇
肿瘤学   219篇
  2022年   36篇
  2021年   85篇
  2020年   52篇
  2019年   65篇
  2018年   69篇
  2017年   49篇
  2016年   59篇
  2015年   83篇
  2014年   82篇
  2013年   124篇
  2012年   218篇
  2011年   214篇
  2010年   151篇
  2009年   113篇
  2008年   178篇
  2007年   184篇
  2006年   161篇
  2005年   144篇
  2004年   138篇
  2003年   130篇
  2002年   123篇
  2001年   100篇
  2000年   106篇
  1999年   93篇
  1998年   50篇
  1997年   33篇
  1996年   40篇
  1995年   34篇
  1994年   37篇
  1993年   36篇
  1992年   69篇
  1991年   65篇
  1990年   54篇
  1989年   63篇
  1988年   64篇
  1987年   64篇
  1986年   60篇
  1985年   61篇
  1984年   41篇
  1983年   44篇
  1982年   24篇
  1981年   27篇
  1980年   21篇
  1979年   25篇
  1978年   18篇
  1977年   20篇
  1976年   25篇
  1975年   22篇
  1974年   23篇
  1972年   19篇
排序方式: 共有4035条查询结果,搜索用时 15 毫秒
51.
International Urology and Nephrology - To report the efficacy and safety of povidone-iodine sclerotherapy of primary symptomatic lymphocele after kidney transplantation in a large contemporary...  相似文献   
52.
53.
Ophthalmologists continue to choose topical antibiotics and corticosteroids more frequently than injectable agents for their current cataract surgical techniques. The preoperative use of povidone-iodine 5% and the postoperative use of impregnated soft contact lenses have helped augment our therapeutic armamentarium. NSAIDs play an important role in decreasing postoperative convalescence with fewer side effects. The intracameral administration of heparin and antibiotic solutions is discussed.  相似文献   
54.
Summary The recognition of recurring sites of chromosome changes in malignancies has greatly facilitated the identification of genes implicated in the pathogenesis of human cancers. Based especially upon recent studies [1–4], it appears increasingly likely that a subset of recurring chromosome alterations will be recognized in human breast cancer. Currently recognized chromosome changes characterizing breast carcinoma include the recognition of cytologic features of gene amplification (e.g. double minutes [dmins] and homogeneously staining regions [HSRs]) [5–8]. As these and other chromosome regions are implicated in recurring abnormalities in breast cancer, it will become increasingly important to have band-or region-specific genomic libraries and probes in order to facilitate high resolution physical mapping and ultimately to clone breast cancer related genes [9]. Toward this end an important recent development in physical mapping has been the establishment of chromosome microdissection as a rapid and reproducible approach to rapidly isolate and characterize chromosome region-specific DNA, greatly facilitating the initial steps in positional cloning of disease-related genes [10–13]. In this brief report, we will highlight the application of chromosome microdissection to the generation of region-specific probes for both fluorescent in situ hybridization (FISH) and the generation of genomic microclone libraries. Additionally, efforts using this methodology to generate a microclone library encompassing the early onset breast/ovarian cancer (BRCA1) gene will be presented.Presented by Jeffrey M. Trent at the 16th Annual San Antonio Breast Cancer Symposium, San Antonio TX, USA, November 4, 1993; Minisymposium on Molecular Genetics in Breast Cancer.  相似文献   
55.
56.
The study aimed at assessment of noise levels in Alexandria airport and measurement of hearing acuity--among other health parameters of the working personnel. By performing 65 sound pressure level measurements, a questionnaire and air conduction audiometry, significant hearing defects could be revealed. Deficiencies affected hearing levels at all frequencies but especially higher frequencies in workers exposed to noise of aircrafts and other airport activities at the exterior of the airport building. The importance of pre-employment and periodic ear and audiometric examinations is thus expressed.  相似文献   
57.
Fifty four patients presenting by huge splenomegaly were admitted to Tropical Medicine Department, El-Minia University Hospital. Tissue biopsy revealed pure bilharziasis due to S. hematobium in 10 (19%) cases, liver cirrhosis in 23 (42%), mixed schistosomiasis and cirrhosis in 8 (15%), hepatoma in 3 (6%), lymphoma in 6 (11%) and hematological diseases in the form of chronic myeloid leukemia in 2 (3.5%) and thalassemia major in 2 (3.5%) cases. The sensitivity and specificity of abdominal ultrasonography was 100% and 97% in cases of schistosomiasis, 100% and 100% in cases of hepatoma, 87% and 100% in cases of liver cirrhosis, 33% and 100% in cases of lymphoma respectively. There was a positive significant correlation between endoscopic variceal grading, portal vein diameter, splenic vein diameter, size of the spleen and the grading of the portal tract thickenings. The pathological and ultrasonographic diagnosis was the same in 38 (70%) cases. Splenogram was characteristic but not diagnostic in cases of schistosomiasis and liver cirrhosis. It was diagnostic and similar to peripheral blood picture in the 2 cases of chronic myeloid leukemia and was normal in cases of thalassemia major. Splenic aspiration was able to diagnose all cases of lymphomas. It can be considered as a useful adjunct to the usual diagnostic procedures, both in staging and follow up, especially in cases presenting only by splenomegaly.  相似文献   
58.
Respond on comments on Lieberman's article: Cyclosiloxanes Produce Fatal Liver and Lung Damage in Mice. Environ Health Perspect 107:161-165  相似文献   
59.
BACKGROUND: We hypothesized that normothermic cardiopulmonary bypass (CPB) would be associated with decreased blood loss and allogeneic transfusion requirements relative to hypothermic CPB. METHODS: After obtaining institutional review board approval and informed patient consent, we conducted a prospective, randomized study of 79 patients undergoing CPB for a primary cardiac operation at normothermic (37 degrees C) (n = 44) or hypothermic temperature (25 degrees C) (n = 35). Blood loss and transfusion requirements in the operating room and for the first 24 hours in the intensive care unit were determined. A paired t test and rank sum tests were used. A p value of less than 0.05 was considered significant. RESULTS: The normothermic and hypothermic CPB groups did not differ in demographic variables, CPB or cross-clamp duration, heparin sodium or protamine sulfate dose, prothrombin time, or thromboelastogram results. There were no differences between the two CPB groups in blood loss or transfusion requirements. CONCLUSIONS: We found that when there was no difference in duration of CPB, normothermic and hypothermic CPB groups demonstrated similar blood loss and transfusion requirements even though other studies have shown hypothermia induces platelet dysfunction and alters the activity of the coagulation cascade.  相似文献   
60.
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