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   4348223篇
  免费   362366篇
  国内免费   14609篇
耳鼻咽喉   62083篇
儿科学   142360篇
妇产科学   118779篇
基础医学   660140篇
口腔科学   123694篇
临床医学   389514篇
内科学   782159篇
皮肤病学   108131篇
神经病学   362901篇
特种医学   175282篇
外国民族医学   815篇
外科学   673348篇
综合类   129195篇
现状与发展   23篇
一般理论   2548篇
预防医学   358927篇
眼科学   103423篇
药学   311286篇
  18篇
中国医学   11212篇
肿瘤学   209360篇
  2021年   50098篇
  2019年   58719篇
  2018年   73772篇
  2017年   55966篇
  2016年   62091篇
  2015年   75491篇
  2014年   110088篇
  2013年   175656篇
  2012年   116560篇
  2011年   120828篇
  2010年   124090篇
  2009年   126435篇
  2008年   108459篇
  2007年   115251篇
  2006年   124775篇
  2005年   120040篇
  2004年   121854篇
  2003年   111601篇
  2002年   101615篇
  2001年   155808篇
  2000年   150811篇
  1999年   138988篇
  1998年   65483篇
  1997年   61679篇
  1996年   59730篇
  1995年   60465篇
  1994年   54836篇
  1993年   50925篇
  1992年   106320篇
  1991年   103032篇
  1990年   99657篇
  1989年   97383篇
  1988年   90778篇
  1987年   89125篇
  1986年   84993篇
  1985年   83660篇
  1984年   69598篇
  1983年   62254篇
  1982年   48910篇
  1981年   45300篇
  1980年   42671篇
  1979年   62255篇
  1978年   49408篇
  1977年   43592篇
  1976年   40695篇
  1975年   41030篇
  1974年   45873篇
  1973年   44301篇
  1972年   41644篇
  1971年   38599篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.
Breast Cancer Research and Treatment - Breast cancer survivors are often prescribed medications for at least 5 years to reduce recurrence risk, yet some forego this treatment due to cost....  相似文献   
43.
PurposeThe clinical manifestations of rickettsial diseases mimic other endemic infections with similar presentations thus posing a serious challenge to clinicians for their diagnosis. For the diagnosis of rickettsial disease serological tests like Weil Felix, ELISA and IFA are used. There are limited studies that have evaluated different serological tests for the diagnosis of rickettsial diseases. Therefore, the present study was undertaken to evaluate the ELISA and Weil Felix test for the diagnosis of rickettsial diseases prevalent in this region.MethodsSamples from 281 patients clinically suspected of rickettsial diseases were tested for spotted fever group (SFG), typhus group (TG) and scrub typhus group (STG) by Weil Felix, ELISA and IFA was taken as the gold standard. Baseline titers and cut-off ODs were calculated by taking samples from healthy blood donors.ResultsThe sensitivity, specificity, positive and negative predictive value of Weil Felix test ranged from 30% to 44%, 83.46%–97.86%, 9%–77%, 92–96% respectively. The sensitivity and specificity, positive and negative predictive value of ELISA ranged from 80.77% to 96.15%, 96.33%–98.43%, 70.21%–88.64%, 92.89%–99.60% respectively. Maximum cross-reactions were observed between SFG and STG by the Weil Felix test and between STG and TG by ELISA.ConclusionsELISA was found to be sensitive and specific for the diagnosis of rickettsial diseases. It is easy to perform, does not require a technical expert for result interpretation and a large number of samples can be processed at a time.  相似文献   
44.
Bulletin of Experimental Biology and Medicine - Fast neutron therapy, which previously has demonstrated effective results, but along with a large number of complications, can again be considered a...  相似文献   
45.
Bulletin of Experimental Biology and Medicine - The psychopharmacological effects of a stimulator of functions of progenitor cells of the nervous tissue STAT3 inhibitor (STAT3 Inhibitor XIV, LLL12)...  相似文献   
46.
47.
48.
49.
50.
The purpose of this study was to provide an evidence base for colorectal cancer research activity that might influence policy, mainly at the national level. Improvements in healthcare delivery have lengthened life expectancy, but within a situation of increased cancer incidence. The disease burden of CRC has risen significantly, particularly in Africa, Asia and Latin America. Research is key to its control and reduction, but few studies have delineated the volume and funding of global research on CRC. We identified research papers in the Web of Science (WoS) from 2007 to 2021, and determined the contributions of the leading countries, the research domains studied, and their sources of funding. We identified 62 716 papers, representing 5.7% of all cancer papers. This percentage was somewhat disproportionate to the disease burden (7.7% in 2015), especially in Eastern Europe. International collaboration increased over the time period in almost all countries except in China. Genetics, surgery and prognosis were the leading research domains. However, research on palliative care and quality-of-life in CRC was lacking. In Western Europe, the main funding source was the charity sector, particularly in the UK, but in most other countries government played the leading role, especially in China and the USA. There was little support from industry. Several Asian countries provided minimal contestable funding, which may have reduced the impact of their CRC research. Certain countries must perform more CRC research overall, especially in domains such as screening, palliative care and quality-of-life. The private-non-profit sector should be an alternative source of support.  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