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   1293355篇
  免费   98460篇
  国内免费   1670篇
耳鼻咽喉   16590篇
儿科学   41987篇
妇产科学   35897篇
基础医学   193629篇
口腔科学   35303篇
临床医学   123046篇
内科学   253288篇
皮肤病学   27806篇
神经病学   104829篇
特种医学   47278篇
外国民族医学   265篇
外科学   181302篇
综合类   26092篇
现状与发展   3篇
一般理论   621篇
预防医学   108624篇
眼科学   28453篇
药学   94328篇
  6篇
中国医学   2075篇
肿瘤学   72063篇
  2019年   10680篇
  2018年   14332篇
  2017年   10934篇
  2016年   11897篇
  2015年   13805篇
  2014年   19029篇
  2013年   29043篇
  2012年   39845篇
  2011年   42412篇
  2010年   24408篇
  2009年   23357篇
  2008年   39944篇
  2007年   42602篇
  2006年   42157篇
  2005年   41164篇
  2004年   39587篇
  2003年   37833篇
  2002年   36635篇
  2001年   56233篇
  2000年   57183篇
  1999年   48358篇
  1998年   13760篇
  1997年   12546篇
  1996年   12934篇
  1995年   12149篇
  1994年   11345篇
  1993年   10618篇
  1992年   38348篇
  1991年   37788篇
  1990年   36562篇
  1989年   35364篇
  1988年   32780篇
  1987年   32127篇
  1986年   30609篇
  1985年   28882篇
  1984年   22080篇
  1983年   19336篇
  1982年   11531篇
  1979年   21038篇
  1978年   15472篇
  1977年   12862篇
  1976年   11899篇
  1975年   12856篇
  1974年   15656篇
  1973年   15405篇
  1972年   14553篇
  1971年   13574篇
  1970年   12812篇
  1969年   12083篇
  1968年   11247篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
52.
Caring for patients with end-stage kidney disease (ESKD) in the United States is challenging, due in part to the complex epidemiology of the disease's progression as well as the ways in which care is delivered. As CKD progresses toward ESKD, the number of comorbidities increases and care involves multiple healthcare providers from multiple subspecialties. This occurs in the context of a fragmented US healthcare delivery system that is traditionally siloed by provider specialty, organization, as well as systems of payment and administration. This article describes the role of care fragmentation in the delivery of optimal ESKD care and identifies research gaps in the evidence across the continuum of care. We then consider the impact of care fragmentation on ESKD care from the patient and health system perspectives and explore opportunities for system-level interventions aimed at improving care for patients with ESKD.  相似文献   
53.
54.
As millions of people turn to social media for health information, better understanding the factors that guide health-related judgments and perceptions in this context is imperative. We report on two Web experiments (n > 400 total) examining the power of society’s widespread weight bias and related stereotypes to influence nutrition judgments in social media spaces. In Experiment 1, meals were judged as lower in nutritional quality when the person who recommended them (the source) was depicted as obese rather than of normal weight, an effect mediated by stereotypic beliefs about the source as a generally unhealthy person. Experiment 2 replicated this effect, which—notably—remained significant when controlling for objective nutritional information (calories and fat content). Results highlight spillover effects of weight bias that extend beyond person perception to color impressions of objects (here, food) that are associated with stigmatized attributes. Implications for everyday nutrition judgments and public health are considered.  相似文献   
55.
56.
57.
58.
59.
A 48-year-old smoker with a history of hyperthyroidism treated 10 years prior to presentation with radioactive iodine ablation of the thyroid gland presented to his ophthalmologist with a 2-week history of transient loss of vision in the right eye occurring for 1 to 2 hours each morning. He denied ocular pain, diplopia or change in the prominence of one or both eyes. Examination revealed 2 mm of relative proptosis on the right, bilateral temporal flare and lower lid retraction. There was minimal upper lid retraction and no evidence of lid lag. Ocular motility was full. Dilated fundoscopic examination revealed bilateral optic nerve edema, right more than left. CT of the orbit demonstrated enlargement of the extraocular muscles bilaterally with marked enlargement of the right medial rectus and left inferior rectus muscles resulting in crowding at the orbital apex bilaterally. Laboratory testing revealed the patient to be hyperthyroid. The patient was treated with high dose oral steroids followed by orbital radiation. Hyperthyroidism was managed by the patient’s primary care physician. Visual symptoms rapidly improved with oral steroids and orbital radiation. Optic nerve edema completely resolved. Repeat CT imaging demonstrated a reduction in the enlargement of the extraocular muscles with relief of bilateral optic nerve compression.  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