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   739001篇
  免费   50980篇
  国内免费   1399篇
耳鼻咽喉   9626篇
儿科学   24152篇
妇产科学   18121篇
基础医学   114386篇
口腔科学   20415篇
临床医学   67339篇
内科学   140946篇
皮肤病学   16596篇
神经病学   52343篇
特种医学   27101篇
外国民族医学   76篇
外科学   109960篇
综合类   15205篇
现状与发展   2篇
一般理论   199篇
预防医学   54365篇
眼科学   16869篇
药学   56443篇
  3篇
中国医学   2388篇
肿瘤学   44845篇
  2021年   6469篇
  2019年   6373篇
  2018年   8983篇
  2017年   6875篇
  2016年   7612篇
  2015年   8501篇
  2014年   11671篇
  2013年   17247篇
  2012年   23140篇
  2011年   24208篇
  2010年   14161篇
  2009年   13249篇
  2008年   22287篇
  2007年   23730篇
  2006年   23932篇
  2005年   22529篇
  2004年   21958篇
  2003年   20722篇
  2002年   20083篇
  2001年   36521篇
  2000年   37079篇
  1999年   30610篇
  1998年   8175篇
  1997年   6900篇
  1996年   7206篇
  1995年   6801篇
  1994年   6267篇
  1992年   23061篇
  1991年   23023篇
  1990年   22389篇
  1989年   22150篇
  1988年   20112篇
  1987年   19475篇
  1986年   18509篇
  1985年   17353篇
  1984年   12755篇
  1983年   10806篇
  1982年   5992篇
  1979年   11554篇
  1978年   8159篇
  1977年   6857篇
  1976年   6609篇
  1975年   7287篇
  1974年   8512篇
  1973年   8154篇
  1972年   7671篇
  1971年   7142篇
  1970年   6886篇
  1969年   6317篇
  1968年   5796篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
The article presents part of the results of a Federal German investigation of psychiatric confinement in cases of delinquency in accordance with German law. Among the 674 inmates whose case history could be included in the investigation, there was a predominance of alcohol dependence in two-thirds of them. Confinement occurred mostly only after addiction and delinquencies had been going on for a long time. In more than one-half of the patients no attempt had previously been made to treat and manage their alcohol addiction. Every fourth patient is confined without first consulting a psychiatric expert. Basing on sociobiographic characteristics it is possible to form two contrasting groups of patients: a smaller group where addiction has set in early and delinquency at a late stage, and a larger one with early onset of delinquency developing parallel to the abuse of alcohol. This leads to conclusions with regard to the development of specific treatment guidelines.  相似文献   
82.
83.
84.
10 patients with CLL and 2 with CML were treated with gradually increasing doses of 1 alpha(OH)D3, up to 4 micrograms daily during 6 wk. 3 patients with preleukemia and 1 with myelofibrosis were treated with 2 micrograms daily of 1 alpha(OH)D3 for a prolonged period up to 17 wk. The treatment with 1 alpha (OH)D3 did not result in changes of disease parameters in any of the patients under study. Receptor studies for 1,25(OH)2D3 were performed in 8 CLL patients and revealed only 1 patient with increased specific receptor binding capacity. The maximum tolerable dose of 1 alpha(OH)D3 varied individually, but was in the range of 2-4 micrograms daily.  相似文献   
85.
Biliopancreatic diversion is a very effective method for weight reduction. In some instances it is too effective and needs to be revised.  相似文献   
86.
87.
In 1983, 1623 primary and secondary schoolchildren took part in a health survey which was organized by the Busselton Population Studies Group. Age, sex, weight, height and country of birth were recorded for each child. Where possible, the country of birth of parents and the occupation of the father were extracted from previous Busselton surveys of adults. Compared with Perth schoolchildren, the difference in the attained weight and height of Busselton children at any age was small. This was so even though the two communities differ in location (rural compared with metropolitan), in ethnic origin (mainly British compared with diverse origins) and, probably, in social-rank distribution. Data from the two communities showed that a similar small secular increase in height had occurred since 1970/1971. This increase averaged at 1.2 cm for children at each year of age in Busselton and 1.5 cm to 1.6 cm for children in Perth.  相似文献   
88.
89.
A novel approach for modelling the biological activity of organic molecules, which requires simultaneous consideration of the influence of all factors (topological, steric, hydrophobic, and electronic) that determine the bioactivity, is used to study the interaction of a series of benzoates with anti-p-(p'-azophenylazo)benzoate antibody. The results obtained suggest that this biological interaction proceeds by a two-step stereospecific mechanism. The first step requires a geometrical correspondence between the benzoates and the cavity in the biomacromolecule, which enables the pharmacophore to come into close contact with the receptor. The second step is the orbitally controlled electronic interaction between the active parts of the benzoates and the antibody. The electronic interaction results from pi-charge transfer from the pharmacophore to the biomacromolecule and from the formation of pi-complexes. A proposed mathematical model for this biological interaction exhibits some statistical advantages over existing models.  相似文献   
90.
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