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   3920241篇
  免费   293726篇
  国内免费   8751篇
耳鼻咽喉   55768篇
儿科学   127235篇
妇产科学   105832篇
基础医学   556382篇
口腔科学   111686篇
临床医学   364905篇
内科学   749562篇
皮肤病学   80164篇
神经病学   324945篇
特种医学   152025篇
外国民族医学   1471篇
外科学   577800篇
综合类   92533篇
现状与发展   3篇
一般理论   1602篇
预防医学   325674篇
眼科学   91217篇
药学   291279篇
  11篇
中国医学   7794篇
肿瘤学   204830篇
  2018年   48014篇
  2017年   36788篇
  2016年   41142篇
  2015年   39564篇
  2014年   55954篇
  2013年   86215篇
  2012年   118710篇
  2011年   130164篇
  2010年   78272篇
  2009年   72626篇
  2008年   122723篇
  2007年   131730篇
  2006年   124860篇
  2005年   122548篇
  2004年   118327篇
  2003年   114821篇
  2002年   111577篇
  2001年   170787篇
  2000年   176834篇
  1999年   149876篇
  1998年   45008篇
  1997年   40531篇
  1996年   39780篇
  1995年   38424篇
  1994年   36019篇
  1993年   33784篇
  1992年   121018篇
  1991年   118201篇
  1990年   114502篇
  1989年   110040篇
  1988年   102039篇
  1987年   100642篇
  1986年   95451篇
  1985年   91465篇
  1984年   69645篇
  1983年   59433篇
  1982年   35979篇
  1981年   32341篇
  1979年   65048篇
  1978年   45938篇
  1977年   38685篇
  1976年   36827篇
  1975年   38925篇
  1974年   47477篇
  1973年   45789篇
  1972年   42660篇
  1971年   39500篇
  1970年   37216篇
  1969年   34401篇
  1968年   31785篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
92.
93.
Summary: A female patient with isovaleric acidaemia had a successful outcome from pregnancy.  相似文献   
94.
95.
OBJECTIVE: To explore the presence and grade of denervation in three mimic muscles in facial nerve palsy. METHODS: The frontalis, orbicularis oculi (OO), and mentalis muscles were explored in 54 patients with Bell's palsy, after 30 days from the beginning of symptoms. Concentric needle electromyography, including fibrillation detection, was performed in the three muscles on the affected side. Compound muscle action potentials (CMAP) were recorded on both sides and a CMAP ratio was calculated from each muscle. The House-Brackman scale was used to assess the initial clinical evaluation and the follow-up until recovery. RESULTS: Fibrillation was recorded in 32 patients on the 30th day after the onset and was present in 100% of mentalis and in 90% of frontalis, but in only 34% of OO, a statistically significant difference. The grade of fibrillation in OO was also statistically lower from those in the other two muscles. The 32 patients were grouped according to the presence (A) or not (B) of fibrillation in OO. In group A, CMAP ratios (affected/normal side) did not differ significantly among the three muscles. However, in group B they were significantly greater in OO and frontalis than in mentalis. In between-group comparison, group B muscles had significantly higher CMAP ratios, lower degree of fibrillation, and better functional recovery. CONCLUSION: In facial palsy, the presence and grade of fibrillation in OO are lower than in frontalis and mentalis muscles and prognosis is more favorable for the non-fibrillating OO group of patients.  相似文献   
96.
OBJECTIVES: To evaluate a novel method for localization of subdural electrodes in presurgical assessment of patients with drug-resistant focal epilepsy. METHODS: We studied eight consecutive patients with posterior epilepsy in whom subdural electrodes were implanted for presurgical evaluation. Electrodes were detected on post-implantation brain CT scans through a semiautomated procedure based on a MATLAB routine. Then, post-implantation CT scans were fused with pre-implantation MRI to localize the electrodes in relation to the underlying cortical structures. The reliability of this procedure was tested by comparing 3D-rendered MR images of the electrodes with electrode position as determined by intraoperative digital photography. RESULTS: In each patient, all electrodes could be correctly localized and visualized in a stereotactic space, thus allowing optimal surgery planning. The agreement between the procedure-generated images and the digital photographs was good according to two independent raters. The mean mismatch between the 3D images and the photographs was 2 mm. CONCLUSIONS: While our findings need confirmation on larger samples including patients with anterior epilepsy, this procedure allowed to localize subdural electrodes and to establish the spatial relationship of each electrode to the underlying brain structure, either normal or damaged, on brain convessity, basal and medial cortex. SIGNIFICANCE: Being simple, rapid, unexpensive, and reliable, this procedure holds promise to be useful to optimize epilepsy surgery planning.  相似文献   
97.
A 27-year-old man was admitted with high fever and shivers eleven days after returning from vacation in Indonesia. Physical examination, laboratory values, abdominal ultrasound, and chest x-ray were not conclusive. All blood cultures yielded growth of Salmonella enterica serovar Typhi, and typhoid fever was diagnosed. Subsequently, the patient developed septic shock and pulmonary edema.In this case report epidemiological, clinical, and therapeutic aspects of typhoid fever are discussed with special emphasis on criteria for severe typhoid fever, which is treated with additional glucocorticoids.  相似文献   
98.
99.
100.
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