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   1177篇
  免费   69篇
  国内免费   3篇
耳鼻咽喉   9篇
儿科学   31篇
妇产科学   21篇
基础医学   131篇
口腔科学   11篇
临床医学   93篇
内科学   256篇
皮肤病学   12篇
神经病学   76篇
特种医学   32篇
外科学   233篇
综合类   22篇
预防医学   31篇
眼科学   108篇
药学   123篇
中国医学   6篇
肿瘤学   54篇
  2023年   4篇
  2022年   25篇
  2021年   76篇
  2020年   27篇
  2019年   29篇
  2018年   26篇
  2017年   19篇
  2016年   37篇
  2015年   39篇
  2014年   55篇
  2013年   55篇
  2012年   83篇
  2011年   87篇
  2010年   47篇
  2009年   48篇
  2008年   65篇
  2007年   63篇
  2006年   85篇
  2005年   58篇
  2004年   45篇
  2003年   46篇
  2002年   33篇
  2001年   10篇
  2000年   17篇
  1999年   11篇
  1998年   4篇
  1997年   5篇
  1996年   12篇
  1995年   5篇
  1994年   4篇
  1993年   4篇
  1992年   15篇
  1991年   9篇
  1990年   7篇
  1989年   7篇
  1988年   9篇
  1987年   7篇
  1986年   3篇
  1985年   4篇
  1984年   4篇
  1983年   4篇
  1982年   3篇
  1980年   4篇
  1976年   4篇
  1975年   6篇
  1974年   5篇
  1973年   3篇
  1971年   3篇
  1970年   3篇
  1969年   6篇
排序方式: 共有1249条查询结果,搜索用时 15 毫秒
51.
52.
53.
54.
We report a case of hairy cell leukemia who improved after cladribine but succumbed to disseminated atypical mycobacterial infection 2 months after completing cladribine.  相似文献   
55.
56.

Background

Unsafe abortion refers to a procedure for terminating an unintended pregnancy performed either by persons lacking the necessary skills or in an environment that does not conform to minimal medical standards, or both.

Objectives

The objectives of the study are to assess the factors attributing to practice of unsafe abortion and to suggest feasible and cost-effective measures to counter the same.

Methods

An extensive search of all materials related to the topic was made using library sources including Pubmed, Medline and World Health Organization. Keywords used in the search include unsafe abortion and unintended pregnancy.

Results

Multiple socio-demographic determinants and barriers such as illiterate women, poor socio-economic status, poor awareness about abortion services, associated stigma, and untrained health professionals have been identified resulting in restricted utilization/access of women to safe abortion services. Consequences of unsafe abortion have been alarming, seriously questioning the quality of health care delivery system.

Conclusion

Concerted and dedicated efforts of government in collaboration with the private sector, community members and non-governmental organizations are needed to ensure that women have a better access to contraceptives, abortion services, and post-abortion care that are safe, affordable, and free from stigma.  相似文献   
57.
58.
IntroductionVasectomy reversal (VR) represents an excellent option for paternity in men who desire to expand their family following vasectomy. Traditional VR via vasovasostomy has a success rate upwards of 90%1,2 but when sperm or sperm parts are not present in vasal fluid, epididymovasostomy (EV) must be performed instead. Our objective was to determine which factors influence success after bilateral EV.MethodsA prospectively maintained database with data from the U.S. and Canada was used to identify men who underwent bilateral EV at time of VR. Success was defined as motile sperm in any postoperative semen analyses. Multivariable logistic regression was used to identify predictors of success.ResultsA total of 200 men had at least one postoperative semen analysis, and 171 men were included in the analysis. Average age was 44.7 years, with average followup of seven months. Median time elapsed between vasectomy and EV was 15 years (interquartile range [IQR] 10–18). Overall success rate was 50%. Despite the study being adequately powered, factors such as years since vasectomy (odds ratio [OR] 1.01, confidence interval [CI] 0.95–1.06), age (OR 0.96, CI 0.91–1.01), intraoperative presence of motile sperm (OR 0.81, CI 0.41–1.62), and epidydimal fluid characteristics did not predict success.ConclusionsBilateral EV at time of VR is successful in 50% of cases in a multi-institutional, North American cohort. Microsurgeons can be reassured that neither time elapsed nor epididymal fluid characteristics negatively impact success rates as long as sperm or sperm parts are present. Surgeons performing VR should be comfortable and prepared to perform EV if indicated.  相似文献   
59.
Myiasis or infestation of living tissues by Diptera (two winged) fly larvae is primarily a problem of cattle and livestock in tropics. Human infestation is rare, occurs accidentally in persons at extremes of age, who are debilitated or not able to ensure basic hygiene and wound cleanliness. Necrotic tissue in wounds of whatever origin provides ideal substrate for the developing larvae. Depending upon the anatomic sites affected it presents clinically as cutaneous myiasis, myiasis of external orifices (oral, nasal, ocular, aural, anal, genital), and myiasis of internal organs (intestinal, urinary). Cutaneous myiasis is perhaps the most commonly reported entity. Species causing skin, subcutaneous and mucosal myiasis include Gastrophilus intestinalis (horse botfly), Hypoderma bovis (cattle botfly), and Dermatobia homonis (human botfly). Musca domestica, the common house fly, is a rare cause of myiasis despite its presence in abundance.This paper describes oral myiasis in a 16-year-old girl of hypotonic cerebral palsy. She had episodic fever, fetid breath, erythematous, tender and ulcerated swelling over anterior palate from which pus and maggots were coming out. She had lip incompetence and bad orodental hygiene. Radiologic and laboratory investigations revealed no abnormality. The maggots were removed manually and she was treated with orodental hygiene sessions, wound care, antibiotics and nutritional supplements. The larval specimens were identified as early instar of M. domestica. Prevention of human myiasis is important and involves control of fly population, general cleanliness, basic sanitation and health education with a special emphasis on oral health care in patients with special needs.  相似文献   
60.
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