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   1267137篇
  免费   95026篇
  国内免费   1585篇
耳鼻咽喉   16381篇
儿科学   41079篇
妇产科学   35001篇
基础医学   189889篇
口腔科学   34787篇
临床医学   118200篇
内科学   248584篇
皮肤病学   27297篇
神经病学   102187篇
特种医学   46965篇
外国民族医学   265篇
外科学   178887篇
综合类   25792篇
现状与发展   3篇
一般理论   569篇
预防医学   104928篇
眼科学   28084篇
药学   92746篇
  7篇
中国医学   2027篇
肿瘤学   70070篇
  2018年   13580篇
  2017年   10439篇
  2016年   11374篇
  2015年   13145篇
  2014年   18081篇
  2013年   27583篇
  2012年   37694篇
  2011年   40122篇
  2010年   23140篇
  2009年   22348篇
  2008年   37928篇
  2007年   40550篇
  2006年   40140篇
  2005年   39268篇
  2004年   37697篇
  2003年   36095篇
  2002年   34978篇
  2001年   56147篇
  2000年   57149篇
  1999年   48185篇
  1998年   13444篇
  1997年   12249篇
  1996年   12686篇
  1995年   11943篇
  1994年   11135篇
  1993年   10425篇
  1992年   38255篇
  1991年   37742篇
  1990年   36519篇
  1989年   35312篇
  1988年   32739篇
  1987年   32088篇
  1986年   30564篇
  1985年   28842篇
  1984年   21968篇
  1983年   19229篇
  1982年   11386篇
  1981年   10338篇
  1979年   20967篇
  1978年   15418篇
  1977年   12815篇
  1976年   11863篇
  1975年   12829篇
  1974年   15617篇
  1973年   15381篇
  1972年   14527篇
  1971年   13567篇
  1970年   12800篇
  1969年   12080篇
  1968年   11247篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Cutaneous plasmacytosis is a rare disorder characterized by a benign proliferation of mature plasma cells that appears as multiple dark-brown to purplish skin lesions, often associated with polyclonal hypergammaglobulinaemia. We present the case of a 55-year-old Caucasian man who suffered from a cutaneous plasmacytosis associated with two different carcinomas. Cutaneous plasmacytosis seems to be a reactive process because most cases reported are not associated with any apparent underlying disease. Nevertheless, because few reported cases were associated with malignancies, screening of additional neoplasms would be justified.  相似文献   
52.
Cell physiology and molecular biology typically follow a reductionistic approach in science. In the last decade, molecular principles and pathogenetic factors involved in the development of many diseases have been successfully discovered. Therefore, early biological concepts based on systemic and cybernetic thoughts have been largely overshadowed by these more recent molecular and pathogenetic factors. This review highlights discoveries on bone development and hypothalamic controlled feeding and eating behavior with a cybernetic and systemic perspective. Interestingly, ancient ideas on bone development and hypothalamic function are still reasonable considerations to embed new molecular discoveries into a systemic concept of principles organizing nature.  相似文献   
53.
54.
55.
The absence of the temporary incisors could be to a genetic illness or to some multiple premature extractions. These extractions are the aftermaths of the carious lesions or some traumatisms underwent by the temporary incisors. Beyond measure the loss of the space, the premature loss some temporary incisors very often assign the relational development of the child and disturb its psychological development and the aesthetic function. Across some cases clinics, the authors show that the replacement of the temporary incisors is the therapeutic ideal solution. Indeed, the child prosthesis, replacing the temporary absent incisors, solves the psychological, aesthetic and relational problems of the child.  相似文献   
56.
Contour defects resulting in deformity caused by lack of tissue can be improved by conventional surgery using autologous tissue, but there is always a donor site morbidity. Integra has been available since the early 1980's for use in acute burns and more recently in reconstruction. It has been shown histologically to act as a tissue regeneration template. The regenerated dermis is buried under an autologous thin split-skin graft. In this study, the principle of burying Integra (without the silicone layer) has been applied to deep tissue defects in 12 reconstructive cases. Such regenerated tissues survive at least 3 years after burying. Modification to the technique to avoid visible edges are being developed.  相似文献   
57.
Summary The third-stage larvae of Daniconema anguillae Moravec et K?ie, 1987 are found in the eels fins caught from Dringis Lake (Lithuanian National park). The morphology of these larvae is briefly described.  相似文献   
58.
59.
OBJECTIVE: To evaluate the effect of statins on aneurysm growth in a group of consecutive patients under surveillance for infrarenal aortic aneurysms (AAA). MATERIALS AND METHODS: All patients (59 statin users, 91 non-users) under surveillance between January 2002 and August 2005 with a follow-up for aneurysm growth of at least 12 months and a minimum of three diameter evaluations were retrospectively included in the analysis. Multiple regression analysis, weighted with the number of observations, was performed to test the influence of statins on AAA growth rate. RESULTS: During a median period of 3.1 (1.1-13.1) years the overall mean aneurysm growth rate was 2.95+/-2.8 mm/year. Statin users had a 1.16 mm/year lower AAA growth rate compared to non-users (95% CI 0.33-1.99 mm/year). Increased age was associated with a slower growth (-0.09 mm/year per year, p = 0.003). Female gender (+1.82 mm/year, p = 0.008) and aneurysm diameter (+0.06 mm/year per mm, p = 0.049) were associated with increased AAA growth. The use of non-steroidal anti-inflammatory drugs, chronic lung disease, or other cardiovascular risk factors were not independently associated with AAA growth. CONCLUSIONS: Statins appear to be associated with attenuation of AAA growth, irrespective of other known factors influencing aneurysm growth.  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