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   180636篇
  免费   52342篇
  国内免费   7057篇
耳鼻咽喉   2374篇
儿科学   5960篇
妇产科学   1625篇
基础医学   24599篇
口腔科学   7041篇
临床医学   27026篇
内科学   34637篇
皮肤病学   8498篇
神经病学   16535篇
特种医学   5814篇
外国民族医学   36篇
外科学   20762篇
综合类   24083篇
现状与发展   36篇
一般理论   23篇
预防医学   14606篇
眼科学   4129篇
药学   18311篇
  191篇
中国医学   10191篇
肿瘤学   13558篇
  2024年   622篇
  2023年   1898篇
  2022年   4736篇
  2021年   7064篇
  2020年   9878篇
  2019年   14021篇
  2018年   13418篇
  2017年   15257篇
  2016年   15125篇
  2015年   17017篇
  2014年   18161篇
  2013年   19090篇
  2012年   13800篇
  2011年   14356篇
  2010年   16379篇
  2009年   11432篇
  2008年   8768篇
  2007年   7172篇
  2006年   6695篇
  2005年   5257篇
  2004年   3856篇
  2003年   3633篇
  2002年   3033篇
  2001年   2633篇
  2000年   2116篇
  1999年   1297篇
  1998年   594篇
  1997年   535篇
  1996年   408篇
  1995年   385篇
  1994年   288篇
  1993年   153篇
  1992年   152篇
  1991年   127篇
  1990年   122篇
  1989年   92篇
  1988年   88篇
  1987年   63篇
  1986年   54篇
  1985年   37篇
  1984年   30篇
  1983年   16篇
  1982年   14篇
  1981年   17篇
  1980年   11篇
  1979年   28篇
  1977年   12篇
  1972年   10篇
  1970年   14篇
  1969年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
目的:分析糖尿病视网膜病变合并黄斑水肿联合采用激光与复方血栓通胶囊治疗的临床疗效。方法:选取我院2017年1月—2019年1月收治的200例糖尿病视网膜病变合并黄斑水肿患者为研究对象,随机分为两组。对照组单独行激光治疗,观察组于对照组基础上联合复方血栓通胶囊治疗,对比两组临床疗效、治疗前后IL-6(白介素-6)、VEGF(血管内皮生长因子)、NOS(血清一氧化氮合成酶)水平变化情况。结果:对照组总有效率(68.00%,68/100)较观察组总有效率(98.00%,98/100)更高(P<0.05);与对照组对比,观察组治疗后NOS水平更高,IL-6、VEGF水平更低(P<0.05)。结论:糖尿病视网膜病变合并黄斑水肿联合采用激光与复方血栓通胶囊治疗的临床疗效显著,值得推广。  相似文献   
7.
8.
In order to solve the problem of long-term (>9 months) efficacy in the treatment of Alzheimer''s disease (AD) by conventional therapy (CT), a staged and multiply-targeted sequential therapy based on the evolvement of patterns (STEP) was developed. Its main innovations include: (1) the time order of evolution of patterns defined by Chinese medicine (CM) in AD was found, that is, "the orderly pattern evolution starting from Shen (Kidney) deficiency, progressing to phlegm, stasis and fire, and worsening to severe toxin as well as functional collapse"; (2) the cascade hypothesis of Shen deficiency in AD and its sequential therapy based on Shen-reinforcing was proposed, that is, "reinforcing Shen in the early stage and throughout the whole process, resolving phlegm, activating blood and purging fire in the middle stage, detoxifying and replenishing vitality to stop the collapse in the advanced stage", and through meta-analysis, clinical drug use was optimized, thus the leap from "inferential selection" to "evidence-based selection" was realized; (3) the STEP regimen combined with CT maintained cognitive and behavioral stability in AD patients for at least 12 months, with cognitive enhancement and behavioral synergy after 9 months, and cognitive benefit was superior to CT at 9, 12, 15, 18, 21, and 24 months, respectively. The 2-year cognitive improvement rate was increased by 25.64% (P=0.020) and the cognitive deterioration rate was decreased by 48.71% (P=0.000). Among them, the cognitive and functional benefits of Shen-reinforcing therapy for very early AD (350 cases) for 1 year were better than the placebo (P<0.001), and the dementia conversion rate was reduced by 8.85% (P=0.002). The behavioral symptomatic relief of patients with vascular dementia received fire-purging therapy (540 cases) was superior to those received CT (P=0.016). These data suggested that the STEP regimen has synergistic effects on CTs at least in terms of cognitive benefit, and the earlier the use, the greater the benefit will have. Therefore, the STEP regimen should be considered as one of the clinical options, particularly for the dearth of effective pharmaceutical or immunological interventions that are currently available for AD.  相似文献   
9.
10.
Laparoscopic surgery has several advantages over traditional surgery because it has been shown to be less invasive. The next logical step in the evolution of minimally invasive surgery may be to eliminate all abdominal incisions. The natural orifices provide a port of entry via the gastrointestinal tract to the peritoneal cavity. This approach would require the creation of a perforation, which is considered to be a major complication of endoscopy with significant morbidity and mortality. However, there are several recent studies that have described the technical feasibility and safety of a per‐oral transgastric approach to the peritoneal cavity using conventional endoscopes. Theoretically, this approach could reduce postoperative abdominal wall pain, wound infection, hernia formation, and adhesions. This article aims to summarize the current status of transgastric surgery, currently referred to as natural orifice transluminal endoscopic surgery (NOTES), and to address some of its future challenges.  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