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   133691篇
  免费   10992篇
  国内免费   6981篇
耳鼻咽喉   1614篇
儿科学   2030篇
妇产科学   1310篇
基础医学   14201篇
口腔科学   2274篇
临床医学   13860篇
内科学   20928篇
皮肤病学   2189篇
神经病学   7196篇
特种医学   6014篇
外国民族医学   25篇
外科学   15980篇
综合类   21268篇
现状与发展   27篇
一般理论   16篇
预防医学   10549篇
眼科学   2561篇
药学   13046篇
  107篇
中国医学   6535篇
肿瘤学   9934篇
  2024年   326篇
  2023年   1283篇
  2022年   3478篇
  2021年   5135篇
  2020年   3735篇
  2019年   3325篇
  2018年   3625篇
  2017年   3676篇
  2016年   3877篇
  2015年   5863篇
  2014年   7336篇
  2013年   7775篇
  2012年   11619篇
  2011年   12222篇
  2010年   9235篇
  2009年   7802篇
  2008年   9254篇
  2007年   9106篇
  2006年   8175篇
  2005年   7353篇
  2004年   5614篇
  2003年   5219篇
  2002年   4498篇
  2001年   2678篇
  2000年   2180篇
  1999年   1434篇
  1998年   861篇
  1997年   854篇
  1996年   574篇
  1995年   502篇
  1994年   417篇
  1993年   291篇
  1992年   312篇
  1991年   284篇
  1990年   214篇
  1989年   203篇
  1988年   178篇
  1987年   150篇
  1986年   138篇
  1985年   94篇
  1984年   82篇
  1983年   74篇
  1982年   51篇
  1981年   41篇
  1979年   51篇
  1978年   61篇
  1977年   48篇
  1974年   41篇
  1973年   40篇
  1972年   40篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
The present study aimed at examining the curative effect of modified posterior operation on treatment of Kümmell''s disease.About 30 patients of Kümmell''s disease with complete image and clinical data treated during June 2004 to July 2013 were conducted with anterior and posterior approaches, respectively. Kyphotic Cobb angle, fractured vertebra wedge angle, and the anterior and posterior heights of fractured vertebra were all measured through x-ray before and after operation, and the pain visual analog scale (VAS) was determined for evaluating the effect of operations. The injury and restoration of neurological function were assessed using Frankel classification.Patients in group A were treated with anterior operation, whereas group B was posterior operation. Postoperatively, VAS score, kyphotic Cobb angle, anterior vertebra height, and pathologic vertebra wedge angle were all significantly improved in patients with Kümmell''s disease receiving modified posterior operation (group B). Similar results were also observed in patients with anterior operation. The improvement of VAS and correction rate of kyphotic Cobb angle indicated equivalent effects of posterior and anterior operations. Meanwhile, alleviated neurological function damage was observed in 2 groups. Relevant factor analysis illustrated that there was no significant correlation of the severity and improvement rate of pain symptoms with age, medical history, anterior and posterior vertebra heights, kyphotic Cobb angle, and pathological vertebra wedge angle.Compared with traditional anterior approach, modified posterior operation, adopting transpedicular vertebral body grafting combined with vertebral pedicle screw fixation, could produce equivalent effects on kyphosis correction, pain relief, and improvement of neurological function in patients with Kümmell''s disease.  相似文献   
2.
3.
4.
5.
6.
7.
王君  梁辉军 《医学综述》2015,(6):1034-1035
急性肺血栓栓塞(APTE)是内科的危急重症之一,是以肺部功能障碍及右心室功能不全为主要特征的心血管疾病。其临床表现复杂,但又缺乏特异性表现,因而易与其他疾病相混淆,造成误诊、漏诊。近年来,APTE的发病率以及致死率呈逐年上升的趋势,使患者的生命健康受到严重威胁。该文系统总结了APTE的诱发因素以及病理学特点,详细介绍了实验室检查以及常用的影像学检查等先进手段,并针对APTE的紧急处理以及当前主要的溶栓和抗凝治疗方法进行概述。  相似文献   
8.
Changes in resting energy expenditure (REE) of cancer patients vary depending on type of tumor, treatment time point and kind of treatment. Little is known about REE of acute leukemia adult patients after treatment, especially with results related to body weight or fat free mass (FFM). This study aimed to assess changes in REE of acute leukemia adult patients before and after the first remission induction. Evaluation of REE was performed by indirect calorimetry and predicted REE was calculated by Harris-Benedict equation. Weight and height were measured and compared to a control group of healthy individuals. FFM was assessed by bioelectrical impedance for adjusting REE values. We evaluated 18 patients and 26 healthy individuals. At diagnosis, patients presented REE, REE/weight, and REE/FFM higher than the controls. Reductions of REE, REE/weight, and REE/FFM were also observed in patients after the first cycle of chemotherapy. The predicted REE for the patients group showed significant lower value compared with measured REE. Before the first cycle of chemotherapy REE was increased but undergoes a reduction after treatment, reaching values similar to the controls. For predictive Harris-Benedict equation, stress factors should be added to avoid underestimation of REE before and after chemotherapy.  相似文献   
9.
蒋巍  孙育民  李颖  王蓓  薛元媛  王骏 《心脏杂志》2015,27(2):249-250
1临床资料患者,男,43岁,因"四肢近端肌肉无力9个月,加剧1周"于2013年9月22日入院。患者于9个月前无明显诱因下出现四肢肌肉无力,以近端肌力减退为主,主要表现为上楼梯费力,提重物困难,易疲劳,尚可参加工作,无发热、皮疹、肌痛、感觉异常等,无明显晨轻暮重的波动现象,上述症状逐渐加重,劳动耐量和日常生活能力进行性下  相似文献   
10.
The cingulum, connecting the orbitofrontal cortex to the medial temporal lobe, involves in diverse cognition functions including attention, memory, and motivation. To investigate the relationship between the cingulum injury and cognitive impairment in patients with chronic mild traumatic brain injury, we evaluated the integrity between the anterior cingulum and the basal forebrain using diffusion tensor tractography in 73 patients with chronic mild traumatic brain injury(39 males, 34 females, age 43.29 ± 11.42 years) and40 healthy controls(22 males, 18 females, age 40.11 ± 16.81 years). The patients were divided into three subgroups based on the integrity between the anterior cingulum and the basal forebrain on diffusion tensor tractography: subgroup A(n = 19 patients)-both sides of the anterior cingulum were intact; subgroup B(n= 36 patients)-either side of the anterior cingulum was intact; and subgroup C(18 patients)-both sides of the anterior cingulum were discontinued. There were significant differences in total Memory Assessment Scale score between subgroups A and B and between subgroups A and C. There were no significant differences in diffusion tensor tractography parameters(fractional anisotropy, apparent diffusion coefficient, and fiber volume) between patients and controls. These findings suggest that the integrity between the anterior cingulum and the basal forebrain, but not diffusion tensor tractography parameter, can be used to predict the cognitive function of patients with chronic mild traumatic brain injury. This study was approved by Yeungnam University Hospital Institutional Review Board(approval No. YUMC-2014-01-425-010) on August 16, 2017.  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