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   4264篇
  免费   229篇
  国内免费   5篇
耳鼻咽喉   98篇
儿科学   233篇
妇产科学   71篇
基础医学   499篇
口腔科学   103篇
临床医学   271篇
内科学   878篇
皮肤病学   106篇
神经病学   192篇
特种医学   85篇
外国民族医学   1篇
外科学   598篇
综合类   140篇
一般理论   3篇
预防医学   158篇
眼科学   258篇
药学   496篇
中国医学   9篇
肿瘤学   299篇
  2023年   33篇
  2022年   82篇
  2021年   133篇
  2020年   80篇
  2019年   81篇
  2018年   121篇
  2017年   109篇
  2016年   110篇
  2015年   142篇
  2014年   156篇
  2013年   190篇
  2012年   316篇
  2011年   311篇
  2010年   185篇
  2009年   164篇
  2008年   262篇
  2007年   276篇
  2006年   229篇
  2005年   169篇
  2004年   145篇
  2003年   159篇
  2002年   112篇
  2001年   68篇
  2000年   97篇
  1999年   93篇
  1998年   30篇
  1997年   19篇
  1996年   19篇
  1995年   18篇
  1994年   21篇
  1992年   42篇
  1991年   47篇
  1990年   38篇
  1989年   35篇
  1988年   28篇
  1987年   21篇
  1986年   34篇
  1985年   27篇
  1984年   30篇
  1983年   19篇
  1982年   12篇
  1981年   19篇
  1979年   25篇
  1977年   11篇
  1975年   13篇
  1974年   22篇
  1973年   17篇
  1972年   28篇
  1970年   15篇
  1967年   17篇
排序方式: 共有4498条查询结果,搜索用时 15 毫秒
31.
Full-thickness deficiency of eyelid tissues can result in coloboma or retraction or both. Here we report our initial experience on the use of auricular skin-cartilage sandwich graft technique for full-thickness eyelid deformities. Five patients (4–32 years) underwent the procedure. Patients with full-thickness eyelid deformity were included. Three patients were operated for large-sized coloboma and two for eyelid retraction. One patient had congenital, and four patients had acquired etiology. The following parameters were specifically assessed: correction of deformity, ocular surface problems, graft status, and epithelization of skin-cartilage graft. All the patients had a good correction of eyelid position, except one patient who had severe eyelid retraction (8 mm) at presentation. None of our patients had corneal erosion/defect, persistent ocular surface redness, or graft loss. The auricular skin-cartilage sandwich graft technique produces optimal results with no graft loss. Advancement of orbicularis muscle in between the auricular skin and cartilage grafts (sandwich technique) is an imperative step that leads to the survival of both grafts.  相似文献   
32.
33.
AIMS: Nicotine dependence is a highly heritable disorder associated with severe medical morbidity and mortality. Recent meta-analyses have found novel genetic loci associated with cigarettes per day (CPD), a proxy for nicotine dependence. The aim of this paper is to evaluate the importance of phenotype definition (i.e. CPD versus Fagerstr?m Test for Cigarette Dependence (FTCD) score as a measure of nicotine dependence) on genome-wide association studies of nicotine dependence. DESIGN: Genome-wide association study. SETTING: Community sample. PARTICIPANTS: A total of 3365 subjects who had smoked at least one cigarette were selected from the Study of Addiction: Genetics and Environment (SAGE). Of the participants, 2267 were European Americans, 999 were African Americans. MEASUREMENTS: Nicotine dependence defined by FTCD score ≥4, CPD. FINDINGS: The genetic locus most strongly associated with nicotine dependence was rs1451240 on chromosome 8 in the region of CHRNB3 [odds ratio (OR)?=?0.65, P?=?2.4?×?10(-8) ]. This association was further strengthened in a meta-analysis with a previously published data set (combined P?=?6.7?×?10(-16) , total n?=?4200). When CPD was used as an alternate phenotype, the association no longer reached genome-wide significance (β?=?-0.08, P?=?0.0004). CONCLUSIONS: Daily cigarette consumption and the Fagerstrom Test for Cigarette Dependence show different associations with polymorphisms in genetic loci.  相似文献   
34.
35.
36.
Richter's hernia     
Richter's hernia is associated with rapid onset of gangrene and a high mortality. We report a case of a strangulated inguinal Richter's hernia of the cecum requiring a laparotomy and bowel resection. Due to the misleading clinical presentation, a high index of suspicion, particularly in patients with a history of laparoscopic surgery, will minimize delay in diagnosis.  相似文献   
37.
BackgroundSelf-retaining brain retractors are commonly used during intracranial surgery, and they are indispensable during microneurosurgery. There is a common severe complication due to the use of self-held retractors, that is, formation of a hemorrhagic infarct area in the brain region exposed to traction. All the more, present retractor systems are fixed and rigid and obstruct surgeons during surgery. Sometimes these retractors create glare in the microscope that distracts the surgeon. We hereby propose a simple and easy method of retraction of brain especially the temporal lobe using the transsylvian approach and vermis using the transvermian approach.MethodsThis is retrospective analysis of 47 patients in 4 years in which we have used our stitch retractor. We have analyzed their outcome, postoperative scan, and ease of performing surgery.ResultsIn 47 patients, there was only 1 postoperative contusion, and the longest period it was kept for is 6 hours. The other advantage was that it does not obstruct in any way while doing dissections and surgery. There was no glare while operating under a microscope.ConclusionWe hereby propose a simple and easy method of retraction of brain especially the temporal lobe using the transsylvian approach and vermis using the transvermian approach. It is minimally traumatic, reducing insult to the brain. It allows the surgeon to dissect without any obstruction and glare in the way. The biggest advantage of the present stitch retractor is that it is very cheap and simple to use.  相似文献   
38.
39.
40.
Digestive Diseases and Sciences - Colectomy risk after acute severe ulcerative colitis (ASUC) has not been compared between Eastern and Western countries. We compared the 1-year colectomy risk...  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