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   5077篇
  免费   230篇
  国内免费   24篇
耳鼻咽喉   25篇
儿科学   322篇
妇产科学   62篇
基础医学   590篇
口腔科学   149篇
临床医学   374篇
内科学   909篇
皮肤病学   242篇
神经病学   269篇
特种医学   100篇
外科学   750篇
综合类   97篇
一般理论   2篇
预防医学   223篇
眼科学   268篇
药学   561篇
  1篇
中国医学   32篇
肿瘤学   355篇
  2023年   32篇
  2022年   106篇
  2021年   175篇
  2020年   82篇
  2019年   99篇
  2018年   113篇
  2017年   77篇
  2016年   128篇
  2015年   155篇
  2014年   188篇
  2013年   269篇
  2012年   394篇
  2011年   411篇
  2010年   214篇
  2009年   175篇
  2008年   323篇
  2007年   320篇
  2006年   290篇
  2005年   296篇
  2004年   308篇
  2003年   256篇
  2002年   213篇
  2001年   66篇
  2000年   50篇
  1999年   57篇
  1998年   69篇
  1997年   32篇
  1996年   28篇
  1995年   33篇
  1994年   26篇
  1993年   26篇
  1992年   35篇
  1991年   27篇
  1990年   29篇
  1989年   24篇
  1988年   10篇
  1987年   16篇
  1986年   12篇
  1985年   11篇
  1984年   15篇
  1983年   7篇
  1982年   17篇
  1981年   17篇
  1980年   18篇
  1979年   13篇
  1978年   18篇
  1977年   11篇
  1976年   10篇
  1975年   5篇
  1974年   5篇
排序方式: 共有5331条查询结果,搜索用时 17 毫秒
951.
Gastroschisis is a rare anomaly and is usually not associated with any other congenital anomalies. The embryology of gastroschisis and omphalocele remains a matter of speculation. Incidences of gastroschisis are particularly high among pregnancies in very young women. The present case is reported because of its rare association with the condition of gastroschisis, disrupted omphalocele, with aplasia of the foot and external genital organs, as well as imperforate anus with distal rectal atresia.  相似文献   
952.
953.
954.
BACKGROUND: School-based interventions are critical for enhancing the health of youth. The Goals for Health (GFH) school-based project was a goal-setting and life-skills intervention conducted in rural areas to increase self-efficacy, knowledge, and positive behaviors related to healthy eating. The intervention was peer-led with high school students teaching health and life skills to sixth-grade students. The purpose of this study was to examine the impact of the GFH school-based program on healthy eating outcomes related to self-efficacy, attitudes, knowledge, and behavior, and to examine the impact of quality of program implementation on the above outcomes. METHODS: Twenty-three rural schools in Virginia (15) and New York (8) participated in the study. Twelve of the schools were intervention schools that received the 12-week GFH program. The remaining 11 were wait-list control schools. Sixth graders (n = 2120 baseline) from all schools were surveyed at 4 time points (preintervention, postintervention, 1 and 2 year follow-up). RESULTS: Results included significant change patterns across the 4 assessment points in the predicted direction for healthy eating-related self-efficacy and fat and fiber knowledge. No significant change patterns were found at follow-up for fat, fiber, or fruit and vegetable intake. Results also indicated differences across gender and ethnicity and significant findings related to quality of implementation. CONCLUSIONS: Future interventions need to provide opportunities to practice healthy living skills over an extended period of time, include components that focus on contextual change in the school and the family, and monitor program implementation.  相似文献   
955.
We report the prevalence and risk factors for glaucoma among aphakes and pseudophakes in 3850 subjects who participated in a population-based study in urban south India. The subjects underwent an ophthalmic examination including applanation tonometry, gonioscopy, optic disc evaluation and frequency doubling perimetry. Glaucoma was diagnosed using the International Society of Geographical and Epidemiological Ophthalmology (ISGEO) criteria. Thirty eight, 15 aphakes and 23 pseudophakes (0.99% of 3850 subjects) of the 406 persons who had undergone cataract surgery were diagnosed with glaucoma. Aphakes/pseudophakes were at higher risk of glaucoma as compared to the phakic population (Odds Ratio: 2.71, 95% CI: 1. 94, 3.38, p=0.001). On multivariate analysis, older age and higher intra ocular pressure were risk factors for glaucoma. Blindness attributable to glaucoma was detected in 20% of aphakic and 4.3% of pseudophakic eyes. Glaucoma was a significant cause of morbidity in those who had undergone cataract surgery in this urban population.  相似文献   
956.
957.

Background  

Nepal has seen substantial improvements in its reproductive health outcomes, but infant and child mortality are still high. This study attempts to examine the prevalence and factors influencing the experience of child death of mothers who have given birth during a five-year period. More specifically, this paper aims to investigate whether household headship has an impact on child death in Nepal.  相似文献   
958.
Trauma during pregnancy can present a unique challenge because of care for the mother and the fetus. About 6-7% of all pregnant patients are exposed to some sort of trauma, especially during the third trimester, with 0.3-0.4% requiring hospitalization. Although mostly accidental, injuries are sometimes caused by intentional violence. There is no published report on bladder rupture following trauma in pregnancy. We report a case of bladder injury following abdominal trauma in a pregnant woman.  相似文献   
959.
960.

Background

Inflammatory myofibroblastic tumors of the trachea are rare childhood quasi-neoplastic lesions.

Case characteristics

7-year-old boy with recurrent episodes of cough, breathing difficulty and wheeze, initially treated as asthma.

Intervention

CT chest and flexible bronchoscopy revealed a mass lesion of the trachea, which was excised by diode laser through the ventilating bronchoscope. Histopathology confirmed it as the inflammatory myofibroblastic tumor.

Message

Use of laser ensured complete endotracheal excision of the tumor.
  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