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   3813417篇
  免费   303037篇
  国内免费   14762篇
耳鼻咽喉   51083篇
儿科学   120146篇
妇产科学   98238篇
基础医学   594983篇
口腔科学   102791篇
临床医学   343734篇
内科学   681275篇
皮肤病学   98879篇
神经病学   320297篇
特种医学   148250篇
外国民族医学   262篇
外科学   586154篇
综合类   114390篇
现状与发展   23篇
一般理论   2407篇
预防医学   313509篇
眼科学   89658篇
药学   263183篇
  26篇
中国医学   11463篇
肿瘤学   190465篇
  2021年   56026篇
  2020年   35663篇
  2019年   58817篇
  2018年   73343篇
  2017年   55942篇
  2016年   61837篇
  2015年   75560篇
  2014年   109904篇
  2013年   175513篇
  2012年   107690篇
  2011年   109708篇
  2010年   121858篇
  2009年   124495篇
  2008年   95975篇
  2007年   100818篇
  2006年   110199篇
  2005年   104839篇
  2004年   106220篇
  2003年   96001篇
  2002年   85104篇
  2001年   136427篇
  2000年   129922篇
  1999年   122252篇
  1998年   68775篇
  1997年   65408篇
  1996年   63114篇
  1995年   58652篇
  1994年   52621篇
  1993年   48993篇
  1992年   85228篇
  1991年   81150篇
  1990年   76879篇
  1989年   75286篇
  1988年   69169篇
  1987年   67365篇
  1986年   63720篇
  1985年   62933篇
  1984年   54988篇
  1983年   49679篇
  1982年   43678篇
  1981年   41050篇
  1980年   38501篇
  1979年   44933篇
  1978年   38318篇
  1977年   34994篇
  1976年   32041篇
  1975年   30855篇
  1974年   32559篇
  1973年   31251篇
  1972年   29100篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
151.

Background

Since recent reports have shown that (-)-Epigallocatechin-3-gallate (EGCG) could be used for treating proliferative and inflammatory disorders, we explored its use for the management of corneal chemical burns.

Materials and methods

Initially, EGCG was assayed on the rabbit corneal epithelial cell line RCE1(5T5) to establish the best testing conditions, and to avoid unwanted outcomes in the experimental animals. Then, we studied its effects on cell proliferation, cell cycle progression and cell differentiation. Afterwards, we instilled EGCG in experimental grade II corneal alkali burns in mice, three times a day up to 21 days, and evaluated by slit lamp examination and histological sections of corneal epithelial, corneal endothelial and stromal edema, as well as the presence of inflammatory cells and neovascularization.

Results

EGCG reduced cell growth and led to a decline in the proportion of proliferative cells in a concentration dependent manner. At 10 μM, EGCG promoted cell differentiation, an effect not related with apoptosis or cytotoxicity. When 10 μM EGCG was instilled in corneal alkali burns in mice three times a day up to 21 days, EGCG significantly reduced corneal opacity and neovascularization. The improved clinical appearance of the cornea was associated to a controlled epithelial growth; epithelial morphology was similar to that observed in normal epithelium and contrasted with the hyperproliferative, desquamating epithelium observed in control burn wounds. EGCG reduced corneal, stromal and endothelial edema, and wound inflammation.

Conclusion

This work constitutes the first evidence for the use of EGCG in the acute phase of a corneal alkali burn, representing a possible novel alternative to improve patient outcomes as an add-on therapy.  相似文献   
152.
153.
154.
155.
The aim of this study is to review the literature to find out the exact etiology of anastomotic cancers of colon post resection and differentiate them between a recurrence, second primary, and metastatic disease (local manifestation of systemic disease). Web-based literature search was done, and datas collected. We searched PubMed for papers using the keywords colon cancer recurrence, anastomotic recurrence, and recurrent colon carcinoma. We also searched for systematic review in the same topic. In addition, we used our personal referrence archive. Anastomotic recurrences of colon are postulated to arise due to inadequate margins, tumor implantation by exfoliated cells, altered biological properties of bowel anastomosis, and missed synchronous lesions. Some tumors are unique with repeated recurrence after repeated resection. Duration after primary surgery plays a major role in differentiating recurrent and second primary lesions. Repeated recurrences after repeated resections have to be considered a manifestation of systemic disease or metastatic disease due to the virulence of the disease. A detailed analysis and study of patients with colonic anastomotic lesion are required to differentiate it between a recurrent, a second primary lesion, and a metastatic disease (local manifestation of a systemic disease). The nomenclature is significant to study the survival of these patients, as a second primary lesion will have different survival compared to that of recurrent lesions.  相似文献   
156.
157.
158.
159.
ObjectivesTo fill an empirical gap in the literature by examining changes in quality of care measures occurring when multispecialty clinic systems were acquired by hospital-owned, vertically integrated health care delivery systems in the Twin Cities area.ConclusionsMoving a clinic system into a vertically integrated delivery system resulted in limited increases in quality of care indicators. Caution is warranted when the acquisition causes disruption in referral patterns.  相似文献   
160.
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