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   155290篇
  免费   31419篇
  国内免费   2411篇
耳鼻咽喉   5352篇
儿科学   5489篇
妇产科学   2445篇
基础医学   3784篇
口腔科学   1625篇
临床医学   26843篇
内科学   48276篇
皮肤病学   7473篇
神经病学   15373篇
特种医学   6512篇
外科学   41530篇
综合类   256篇
现状与发展   72篇
预防医学   7122篇
眼科学   3397篇
药学   1364篇
中国医学   18篇
肿瘤学   12189篇
  2024年   685篇
  2023年   4803篇
  2022年   1238篇
  2021年   3120篇
  2020年   6049篇
  2019年   2198篇
  2018年   7428篇
  2017年   7383篇
  2016年   8456篇
  2015年   8437篇
  2014年   15513篇
  2013年   15683篇
  2012年   5587篇
  2011年   5646篇
  2010年   10464篇
  2009年   14329篇
  2008年   5976篇
  2007年   4231篇
  2006年   6721篇
  2005年   4020篇
  2004年   3319篇
  2003年   2297篇
  2002年   2346篇
  2001年   3895篇
  2000年   3123篇
  1999年   3301篇
  1998年   3737篇
  1997年   3542篇
  1996年   3426篇
  1995年   3266篇
  1994年   2007篇
  1993年   1647篇
  1992年   1493篇
  1991年   1514篇
  1990年   1169篇
  1989年   1279篇
  1988年   1089篇
  1987年   937篇
  1986年   940篇
  1985年   772篇
  1984年   610篇
  1983年   558篇
  1982年   540篇
  1981年   432篇
  1980年   395篇
  1979年   350篇
  1978年   368篇
  1977年   437篇
  1975年   293篇
  1972年   312篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
33.
This paper reports the proceedings of the discussion panel assigned to look at clinical aspects of quality in emergency medicine. One of the seven stated objectives of the Academic Emergency Medicine consensus conference on quality in emergency medicine was to educate emergency physicians regarding quality measures and quality improvement as essential aspects of the practice of emergency medicine. Another topic of interest was a discussion of the value of information technology in facilitating quality care in the clinical practice of emergency medicine. It is important to note that this is not intended to be a comprehensive review of this extensive topic, but instead is designed to report the discussion that occurred at this session of the consensus conference.  相似文献   
34.
Objective: The study goal was to compare the laser spot size created using reflective and refractive micromanipulators with a CO2 laser and to determine the sensitivity of spot size to laser power. Study Design and Setting: A CO2 laser and operating microscope (400-mm focal length) was coupled to either a reflective (Cassegrain-like) or refractive micromanipulator. Laser spot size was determined by measuring the region of ablation created by laser irradiation of wood (dry tongue depressors), exposed photographic film, and agar gel using optical micrometry. Laser power varied from 0.5 to 20 W with pulse durations of 0.1 and 0.5 second. Results: The reflective micromanipulator demonstrated overall smaller spot sizes for a given laser power and lower incremental change in spot size with increasing power. The reflective design demonstrated less sensitivity to increases in laser power. Conclusions: Micromanipulator optical design can result in significant differences in laser spot size. The reflective device used in this study demonstrated less sensitivity to increasing laser power. (Otolaryngol Head Neck Surg 2002;126:593-597.)  相似文献   
35.
36.
37.
38.
39.
40.
Background contextLarge, prominent osteophytes along the anterior aspect of the cervical spine have been reported as a cause of dysphagia. Improvement of swallowing after surgical resection has been reported in a few case reports with short-term follow-up. The current report describes outcomes of a series of five patients with surgical treatment for this rare disorder, with a long-term follow-up.PurposeTo study the clinical and radiographic outcomes of a case series of patients surgically treated for dysphagia secondary to cervical diffuse idiopathic skeletal hyperostosis (DISH).Study designRetrospective review of a case series.Patient sampleFive cases from a University Hospital.Outcome measuresClinical and imagenological follow-up.MethodsThe records of five patients with dysphagia who had undergone anterior surgical resection of prominent osteophytes secondary to DISH were reviewed. Extrinsic esophageal compression secondary to anterior cervical osteophytes was radiographically confirmed via preoperative barium esophagogram swallowing study. All patients underwent anterior cervical osteophytes resection without fusion. Postoperatively, patients were followed-up clinically and radiographically with routine lateral cervical radiographs.ResultsPreoperative esophagogram showed that the esophageal obstruction was present at one level in three cases and two levels in two cases. The C3–C4 level was involved in three cases, C4–C5 in three cases, and C5–C6 in one case. There were no postoperative complications, including recurrent laryngeal nerve palsy, wound infection, or hematomas. All patients had resolution of dyphagia soon after surgery (within 2 weeks). Postoperative radiographs demonstrated complete removal of osteophytes. At final follow-up, ranging from 1 to 9 years (average 59.8 months, median 53 months), no patients reported recurrence of dysphagia. Final radiographic examination demonstrated minimal regrowth of the osteophytes.ConclusionsAlthough rarely indicated, surgical resection of anterior cervical osteophytes from DISH causing dyphagia produces good clinical and radiographical outcomes. After thorough evaluation to rule out other intrinsic or extrinsic causes of swallowing difficulty, surgical treatment of this uncommon condition might be considered.  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