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   1524127篇
  免费   144935篇
  国内免费   2367篇
耳鼻咽喉   21946篇
儿科学   53471篇
妇产科学   39669篇
基础医学   221829篇
口腔科学   42397篇
临床医学   136937篇
内科学   316398篇
皮肤病学   38761篇
神经病学   128248篇
特种医学   58385篇
外国民族医学   715篇
外科学   230810篇
综合类   27915篇
现状与发展   1篇
一般理论   453篇
预防医学   116456篇
眼科学   32460篇
药学   112939篇
  2篇
中国医学   3970篇
肿瘤学   87667篇
  2021年   12261篇
  2020年   11583篇
  2019年   22318篇
  2018年   27252篇
  2017年   23141篇
  2016年   24829篇
  2015年   26665篇
  2014年   31804篇
  2013年   44142篇
  2012年   53073篇
  2011年   55064篇
  2010年   36887篇
  2009年   31430篇
  2008年   49986篇
  2007年   52505篇
  2006年   51703篇
  2005年   50313篇
  2004年   48681篇
  2003年   46661篇
  2002年   45485篇
  2001年   68230篇
  2000年   70698篇
  1999年   59892篇
  1998年   15899篇
  1997年   14383篇
  1996年   14776篇
  1995年   13980篇
  1994年   13233篇
  1993年   12144篇
  1992年   46563篇
  1991年   45334篇
  1990年   43966篇
  1989年   41707篇
  1988年   38428篇
  1987年   37648篇
  1986年   34949篇
  1985年   33531篇
  1984年   25084篇
  1983年   21053篇
  1982年   12214篇
  1979年   22140篇
  1978年   15396篇
  1977年   13060篇
  1976年   12127篇
  1975年   13201篇
  1974年   15392篇
  1973年   14850篇
  1972年   13617篇
  1971年   12345篇
  1970年   11644篇
排序方式: 共有10000条查询结果,搜索用时 203 毫秒
101.
Haemophilia is a common cause of genetically inherited bleeding disorders. Pseudotumours occur in 1–2 % of persons with severe forms of haemophilia. These are a result of repeated haemorrhage into soft tissues, subperiosteum or a site of bone fracture with inadequate resorption of the extravasated blood. There are a number of therapeutic alternatives for this dangerous condition: surgical removal, percutaneous management, irradiation, embolization etc. In this case report, we describe the natural history, clinical course and successful surgical management of a patient with haemophilia who presented with a massive pseudotumour. We also briefly review the relevant literature on the various therapeutic modalities that have been implemented in the management of this rare complication. Though surgeons may be averse to operate on haemophiliacs, primary surgical management as done in our case may prove to be the definitive treatment option for such patients.  相似文献   
102.
103.
104.
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   
105.
106.
107.
108.
109.
The present study aimed at measuring seropositivities for infection by Ascaris suum and Toxocara canis using the excretory/secretory (E/S) antigens from Ascaris suum (AES) and Toxocara canis (TES) within an indigenous population. In addition, quantification of cytokine expressions in peripheral blood cells was determined. A total of 50 Warao indigenous were included; of which 43 were adults and seven children. In adults, 44.1% were seropositive for both parasites; whereas children had only seropositivity to one or the other helminth. For ascariosis, the percentage of AES seropositivity in adults and children was high; 23.3% and 57.1%, respectively. While that for toxocariosis, the percentage of TES seropositivity in adults and children was low; 9.3% and 14.3%, respectively. The percentage of seronegativity was comparable for AES and TES antigens in adults (27.9%) and children (28.6%). When positive sera were analyzed by Western blotting technique using AES antigens; three bands of 97.2, 193.6 and 200.2 kDas were mostly recognized. When the TES antigens were used, nine major bands were mostly identified; 47.4, 52.2, 84.9, 98.2, 119.1, 131.3, 175.6, 184.4 and 193.6 kDas. Stool examinations showed that Blastocystis hominis, Hymenolepis nana and Entamoeba coli were the most commonly observed intestinal parasites. Quantification of cytokines IFN-γ, IL-2, IL-6, TGF-β, TNF-α, IL-10 and IL-4 expressions showed that there was only a significant increased expression of IL-4 in indigenous with TES seropositivity (p < 0.002). Ascaris and Toxocara seropositivity was prevalent among Warao indigenous.  相似文献   
110.
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