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   689913篇
  免费   67166篇
  国内免费   2954篇
耳鼻咽喉   12447篇
儿科学   23368篇
妇产科学   16353篇
基础医学   92162篇
口腔科学   16725篇
临床医学   72348篇
内科学   147124篇
皮肤病学   20440篇
神经病学   53068篇
特种医学   25360篇
外国民族医学   63篇
外科学   121212篇
综合类   8895篇
现状与发展   72篇
一般理论   133篇
预防医学   48608篇
眼科学   16369篇
药学   43329篇
中国医学   1174篇
肿瘤学   40783篇
  2021年   6849篇
  2020年   8126篇
  2019年   6417篇
  2018年   13649篇
  2017年   11613篇
  2016年   12912篇
  2015年   13222篇
  2014年   21749篇
  2013年   25980篇
  2012年   20604篇
  2011年   22362篇
  2010年   19637篇
  2009年   22342篇
  2008年   21477篇
  2007年   20806篇
  2006年   23253篇
  2005年   20079篇
  2004年   18886篇
  2003年   17174篇
  2002年   16962篇
  2001年   28873篇
  2000年   29462篇
  1999年   24408篇
  1998年   9143篇
  1997年   8163篇
  1996年   8389篇
  1995年   7806篇
  1994年   6250篇
  1993年   5707篇
  1992年   17120篇
  1991年   17700篇
  1990年   17472篇
  1989年   16970篇
  1988年   15590篇
  1987年   15264篇
  1986年   14474篇
  1985年   13694篇
  1984年   10189篇
  1983年   8779篇
  1979年   9722篇
  1978年   7190篇
  1977年   6170篇
  1976年   5836篇
  1975年   6683篇
  1974年   7849篇
  1973年   7359篇
  1972年   7250篇
  1971年   6878篇
  1970年   6419篇
  1969年   5962篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.

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   
82.
83.
84.
85.
86.
Eccrine naevus (EN) is a rare skin hamartoma included in the organoid group of epidermal naevi, histologically defined as focal hyperplasia and/or hypertrophy of eccrine glands. Clinically, EN usually presents as hyperhidrotic patches with no visible skin changes, frequently located on the forearms. The decision to treat EN or not usually depends on the grade of hyperhidrosis, but there is no therapeutic consensus because of the rarity of this condition. We present a case diagnosed as EN in an adult patient with severe localized hyperhidrosis, which was successfully treated with botulinum toxin.  相似文献   
87.
88.
89.
Thyroid diseases are common, and use of levothyroxine is increasing worldwide. We investigated the influence of gender, race and socioeconomic status on the diagnosis and treatment of thyroid disorders using data from the Brazilian Longitudinal Study of Adult Health (ELSA-Brasil), a multicenter cohort study of civil servants (35-74 years of age) from six Brazilian cities. Diagnosis of thyroid dysfunction was by thyrotropin (TSH), and free thyroxine (FT4) if TSH was altered, and the use of specific medications. Multivariate logistic regression models were constructed using overt hyperthyroidism/hypothyroidism and levothyroxine use as dependent variables and sociodemographic characteristics as independent variables. The frequencies of overt hyper- and hypothyroidism were 0.7 and 7.4%, respectively. Using whites as the reference ethnicity, brown, and black race were protective for overt hypothyroidism (OR=0.76, 95%CI=0.64-0.89, and OR=0.53, 95%CI=0.43-0.67, respectively, and black race was associated with overt hyperthyroidism (OR=1.82, 95%CI=1.06-3.11). Frequency of hypothyroidism treatment was higher in women, browns, highly educated participants and those with high net family incomes. After multivariate adjustment, levothyroxine use was associated with female gender (OR=6.06, 95%CI=3.19-11.49) and high net family income (OR=3.23, 95%CI=1.02-10.23). Frequency of hyperthyroidism treatment was higher in older than in younger individuals. Sociodemographic factors strongly influenced the diagnosis and treatment of thyroid disorders, including the use of levothyroxine.  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