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   3514篇
  免费   475篇
  国内免费   4篇
耳鼻咽喉   19篇
儿科学   170篇
妇产科学   46篇
基础医学   301篇
口腔科学   71篇
临床医学   194篇
内科学   433篇
皮肤病学   20篇
神经病学   75篇
特种医学   190篇
外科学   188篇
综合类   29篇
预防医学   1983篇
眼科学   13篇
药学   91篇
肿瘤学   170篇
  2023年   33篇
  2022年   62篇
  2021年   37篇
  2020年   93篇
  2019年   37篇
  2018年   101篇
  2017年   104篇
  2016年   106篇
  2015年   99篇
  2014年   105篇
  2013年   185篇
  2012年   62篇
  2011年   62篇
  2010年   123篇
  2009年   141篇
  2008年   71篇
  2007年   88篇
  2006年   98篇
  2005年   86篇
  2004年   66篇
  2003年   56篇
  2002年   113篇
  2001年   121篇
  2000年   79篇
  1999年   165篇
  1998年   174篇
  1997年   205篇
  1996年   222篇
  1995年   137篇
  1994年   63篇
  1993年   133篇
  1992年   37篇
  1991年   23篇
  1990年   42篇
  1989年   45篇
  1988年   50篇
  1987年   43篇
  1986年   52篇
  1985年   47篇
  1984年   32篇
  1983年   36篇
  1982年   31篇
  1981年   31篇
  1980年   23篇
  1979年   35篇
  1978年   24篇
  1977年   30篇
  1976年   30篇
  1975年   22篇
  1974年   17篇
排序方式: 共有3993条查询结果,搜索用时 0 毫秒
31.
32.
33.
34.
OBJECTIVE: To evaluate the success of the Southeast Asian Health Project in terms of client satisfaction with the prenatal care and other services. To obtain additional data about Southeast Asian women's health practices regarding childbearing. DESIGN: Survey through questionnaires administered as interviews. SETTING: In clients' homes or via telephone. PARTICIPANTS: 119 women from SEAHP's case files of recently delivered clients. MEASUREMENTS AND MAIN RESULTS: Interviews were conducted by four community workers fluent in Cambodian or Lao. The majority of women were satisfied with SEAHP, particularly the interpretation and education in native languages. Women were also satisfied with SEAHP, encouraging others to seek care. CONCLUSIONS: SEAHP appears to meet prenatal care needs of Southeast Asian women in Long Beach, California. More objective outcome data await analyses, but the program's approach may ensure access to and use of health services.  相似文献   
35.
36.
37.
38.
Objective To determine the day-to-day variation in biochemical measures of iron status in a group of elderly women with rheumatoid arthritis compared with a group of healthy elderly women.Design Venous blood samples were collected from each subject on 3 nonconsecutive days during a 2-week study period; subjects had fasted overnight. Variability in hemoglobin level, hematocrit value, serum iron concentration, total iron-binding capacity, transferrin saturation, serum ferritin concentration, and plasma transferrin receptor level was determined.Subjects Two groups of women, one with rheumatoid arthritis (n=10) and another that was apparently healthy (n=10).Statistical analyses Variance component analysis was used to estimate the biological variation (σ2day) and analytic variation (σ2rep) for each iron index. The coefficient of variation (CV) for each variance component was calculated: coefficient of biological variation = CVday, coefficient of analytic variation = CVrep, and coefficient of a single future determination = CVfd.Results The CVrep for all iron indexes was smaller than the CVday in both groups. The CVday was considerably higher for serum iron concentration and for transferrin saturation than for the other indexes in both groups (16.6% arid 16.6% in healthy subjects and 33.6% and 28.2%, respectively, in subjects with rheumatoid arthritis). The higher CVday for serum iron concentration and transferrin saturation translated into a higher CVfd for these indexes. Because of the higher variance for these two indexes, more sampling days were required for reliable estimates. CVda and CVfd for plasma transferrin receptor level were relatively low.Conclusions These findings corroborate our previous finding that variation of serum ferritin concentration in the elderly is lower than that demonstrated in younger populations. This aging effect persists in the presence of rheumatoid arthritis. Fasting appeared to improve reliability in the determinations for serum iron concentration and transferrin saturation. Variability estimates for the indexes other than serum iron concentration and transferrin saturation were not altered by the inflammation of rheumatoid arthritis. Plasma transferrin receptor level is a reliable index for assessing iron status in populations with rheumatoid arthritis. J Am Diet Assoc. 1996; 96:247-251.  相似文献   
39.
40.
Immunostaining for pepsinogen with an immunoglobulin-peroxidase bridge procedure has been undertaken in conjunction with cytochemical staining for complex carbohydrate to investigate the composition and nature of large inclusions in gastric chief cells of beige mice with an analog of the human Chediak-Higashi syndrome (CHS). By these methods to stain chief cells and immunostaining for carbonic anhydrase to distinguish parietal cells, stomachs of the beige mouse were compared with those of normal black mice from which the genetic defect arose. The staining has confirmed that the chief cells are involved in CHS and has affirmed that one type of megabody in CHS chief cells contains both group I and group II pepsinogens and apparently arises in a process akin to crinophagy.  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