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:      
  示例: 沙坡头地区,人工植被区,变化  检索词用空格隔开表示必须包含全部检索词,用“,”隔开表示只需满足任一检索词即可!
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   1469篇
  免费   52篇
  国内免费   71篇
耳鼻咽喉   1篇
儿科学   63篇
妇产科学   10篇
基础医学   148篇
口腔科学   22篇
临床医学   171篇
内科学   410篇
皮肤病学   43篇
神经病学   32篇
特种医学   362篇
外国民族医学   1篇
外科学   45篇
综合类   48篇
预防医学   61篇
眼科学   13篇
药学   75篇
中国医学   1篇
肿瘤学   86篇
  2023年   9篇
  2022年   3篇
  2021年   10篇
  2020年   8篇
  2019年   14篇
  2018年   16篇
  2017年   3篇
  2016年   27篇
  2015年   21篇
  2014年   21篇
  2013年   37篇
  2012年   22篇
  2011年   28篇
  2010年   50篇
  2009年   49篇
  2008年   30篇
  2007年   65篇
  2006年   36篇
  2005年   53篇
  2004年   13篇
  2003年   16篇
  2002年   14篇
  2001年   18篇
  2000年   22篇
  1999年   21篇
  1998年   93篇
  1997年   95篇
  1996年   105篇
  1995年   63篇
  1994年   62篇
  1993年   64篇
  1992年   11篇
  1991年   32篇
  1990年   28篇
  1989年   51篇
  1988年   40篇
  1987年   52篇
  1986年   34篇
  1985年   45篇
  1984年   24篇
  1983年   17篇
  1982年   26篇
  1981年   22篇
  1980年   32篇
  1979年   10篇
  1978年   13篇
  1977年   16篇
  1976年   26篇
  1975年   15篇
  1970年   4篇
排序方式: 共有1592条查询结果,搜索用时 15 毫秒
51.
    
  相似文献   
52.
  总被引:6,自引:2,他引:4  
We looked for mutations of exons 5 to 8 of the P53 gene in 10 patients with acute myeloid leukemia (AML) and 17p monosomy, and 36 patients with AML and no cytogenetic abnormalities of 17p. DNA was analyzed by polymerase chain reaction, single-strand conformation polymorphism analysis, and nucleotide sequencing. Four of the 10 patients with 17p monosomy showed point mutation, single-nucleotide deletion, or insertion in exons 7 or 8. By contrast, only 1 of the 36 patients with AML and no cytogenetic abnormalities of 17p showed a mutation of the P53 gene in exons 5 to 8 (P less than .01). These results suggest that alterations of the P53 gene may have a role in leukemogenesis in some cases of AML. The fact that P53 gene mutations occurred more often in patients with 17p monosomy seems to support the \"recessive\" model of tumor suppressive activity of the P53 gene rather than the \"dominant\" model, in which alteration of only one allele is sufficient for the development of malignancy.  相似文献   
53.
54.
55.
CASE REPORT: We present a case of traumatic displacement of corneal flap in the superior temporal quadrant 13 days after LASIK. The flap was repositioned after gentle irrigation of BSS, cleaned the interface and then drying the flap to verify its stability. In the next day the flap was adhered, clear cornea,smooth and visual acuity without correction was 1.00. DISCUSSION: We should try immediately to reposition the flap after traumatic displacement, as in this case.  相似文献   
56.
57.
PURPOSE/METHODS: We report a 34-year-old woman with sytemic lupus erythematosus (S.L.E.) and antiphospholipidic syndrome which presented severe ischaemic retinopathy and neovascular proliferation. RESULTS/CONCLUSIONS: We achieved no progression of the disease and stabilization of visual acuity with panphotocoagulation. We recommend periodic ophtalmologic exams because of the scarce symptomatology.  相似文献   
58.
59.
It is an honour to have been asked to contribute to this volume that commemorates the life and work of Spyros Doxiadis. Spyros was, and is still, a vital and stimulating influence on those of us who were fortunate enough to have been his colleague in all phases of his life. My period of closeness to him was when he was working in Sheffield with Ronald Illingworth. At that time (now over 40 years ago) he and Katherine were having their children and my wife and I was having ours. Then words like "bonding" had not become commonplace as today, but the functional patterns of family relationships were something about which we were intensely aware. I particularly remember a summer when we were holidaying on a tidal estuary between Anglesey and Holy Island and recall a moment when Spyros and I were sitting on a grass topped sandbank watching our children and wives at the water's edge "messing around" with a boat. We watched and discussed the beauty of the postures and poses of our womenfolk with the children and the children with each other. It was the memory of that conversation that stimulated me to propose the topic of this essay in Spyros' memory.  相似文献   
60.
A total of 130 short children were included in a French multicentre study and randomized between a control group (group A) and two groups treated with daily subcutaneous injections of GH at doses of 0.7 IU/kg/week (group B) and 1.4 IU/kg/week (group C) for 2 years. Height velocity was significantly increased ( p <0.0005) in groups B and C, with a greater increase in group C than in group B ( p < 0.001). The benefit after 2 years compared with controls was 4.3 cm in group B and 5.9 cm in group C. The rate of bone maturation was not affected by GH therapy. These results led to the conclusion that 2 years of treatment with GH improves final height prognosis in children with short stature secondary to IUGR, and that this effect is dose dependent. The effect on final height has still to be demonstrated.  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