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   705787篇
  免费   48872篇
  国内免费   1305篇
耳鼻咽喉   9166篇
儿科学   23267篇
妇产科学   17603篇
基础医学   110389篇
口腔科学   19955篇
临床医学   63758篇
内科学   134296篇
皮肤病学   16159篇
神经病学   49431篇
特种医学   25737篇
外国民族医学   76篇
外科学   104473篇
综合类   14818篇
现状与发展   2篇
一般理论   160篇
预防医学   51387篇
眼科学   16319篇
药学   53944篇
  3篇
中国医学   2359篇
肿瘤学   42662篇
  2019年   5431篇
  2018年   7857篇
  2017年   6105篇
  2016年   6818篇
  2015年   7549篇
  2014年   10261篇
  2013年   15378篇
  2012年   20489篇
  2011年   21481篇
  2010年   12715篇
  2009年   11930篇
  2008年   19983篇
  2007年   21501篇
  2006年   21894篇
  2005年   20435篇
  2004年   19982篇
  2003年   18941篇
  2002年   18448篇
  2001年   36327篇
  2000年   36896篇
  1999年   30380篇
  1998年   7875篇
  1997年   6663篇
  1996年   6969篇
  1995年   6628篇
  1994年   6097篇
  1993年   5590篇
  1992年   22972篇
  1991年   22929篇
  1990年   22312篇
  1989年   22077篇
  1988年   20037篇
  1987年   19419篇
  1986年   18470篇
  1985年   17305篇
  1984年   12697篇
  1983年   10741篇
  1982年   5922篇
  1979年   11519篇
  1978年   8128篇
  1977年   6832篇
  1976年   6594篇
  1975年   7268篇
  1974年   8498篇
  1973年   8141篇
  1972年   7658篇
  1971年   7127篇
  1970年   6877篇
  1969年   6306篇
  1968年   5780篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
951.
203 patients with juvenile kyphosis, aged 11-16 years, have been subjected to the complex examination, including ++clinico-roentgenologic and physiologic methods. Along with the cardinal signs, common for juvenile kyphosis diagnosis and characteristic of the dystrophic process (wedge distortion, osteoporosis of vertebra bodies and fragmentation of their apophyses, dedifferentiation of the bone structure, height reduction and pathologic restructuring of intervertebral disks following the pattern of fibrosis, presence of discal hernia), the signs of bone ++ dysplasia of spine and skeleton in general should be singled out of the roentgenologic characteristic of disease which determine the variants of pathologic process course and treatment tactics. The presence of dysontogenesis signs in patients with juvenile kyphosis is suggested.  相似文献   
952.
Pronounced changes in the content of collagen, non-collagen proteins and the activity of a number of lysosomic enzymes have been established in the bone tissue of the vertebral bodies obtained on diskepiphysectomy in the patients with dysplastic scoliosis. Numerous correlation links between the metabolic parameters and the spinal deformation a year after diskepiphysectomy have been determined.  相似文献   
953.
954.
955.
This is the second reported case of a malignant fibrous histiocytoma of the heart that metastasized to the brain. A 33-year-old woman developed headache, nausea, and ataxic gait 9 months after removal of the tumor from the left atrium of the heart. Computed tomographic and magnetic resonance imaging scans disclosed multiple metastatic tumors in the brain. Although dramatic improvement in her symptoms and signs followed the removal of the brain tumors, she died of tumor recurrence in the left atrium 3 months after the removal of the metastatic brain tumors.  相似文献   
956.
957.
The paper emphasized the role of mumps complicated by orchitis in the etiology of male subfertility with allowances for a possible development of testicular degeneration in the course of epidemic parotiditis alone, i.e. without clinically evident orchitis. To distinguish the impact of mumps sustained in childhood on the infertility development clinical and laboratory investigations would be advisable in the majority of subfertile males. The results of clinical and statistical study of 865 infertile males aged between 20 and 36 yrs whose marital life varied from 8 mos to 12 yrs were reported. Anamnestic evidence of epidemic parotiditis sustained at the age of 5-13 yrs was found in 174 examinees (20.1 per cent). Spermographic data on subfertile males with a history of mumps were exposed to statistical computation and correlated with the data on 200 subfertile males who avoided the disease and the data on 22 healthy fertile males. The authors noted significantly low (p less than 0.05) contents of ejaculate spermatozoa in subfertile males with a history of mumps and a significantly low number of morphologically normal spermatozoa (p less than 0.001) in comparison to those values in subfertile males without a history of epidemic parotiditis.  相似文献   
958.
959.
The method of treatment after Ilizarov was used in 28 patients with occlusion of lower extremity arteries, mainly of distal localization, with the III and IV degrees of ischemia. Osteotomy of mainly the tibial bone and distraction of the free osseous split was performed during 31-36 days. Two patients had fractures of the bone during operative interventions, after operation four patients had purulent complications or necrosis of the skin around the wire. The immediate positive result was noted in 20 patients. Their fate was followed-up in remote periods from 2 to 19 months, good results were observed in 18 patients. The use of the Ilizarov method was most justified in patients with the III and IV degrees of ischemia when other methods of treatment failed to give any effect and surgical reconstruction of the vessels is impossible. When treating patients with the IV degree, it is necessary to take into consideration the late appearance of revascularization and possibility of temporary deterioration. The use of the Ilizarov method foresees provision of the joint work of an angiosurgeon and a traumatologist-orthopedist.  相似文献   
960.
We report the results and complications of 103 consecutive patients who underwent percutaneous removal of renal and ureteral stones. The overall clinical success rate was 80.6%. For the recent 33 cases in which UL-arm fluoroscopy was used, however, the success rate was as high as 87.9%, which was considered to be due to easier establishment of percutaneous direct access. The most common complications were bleeding (18.5%), extravasation (15.5%) and fever (9.7%). Four cases with significant bleeding required arteriography, but there were no sign of arteriovenous fistula nor pseudoaneurysms in any cases. To study renal parenchymal damage in the percutaneous procedures, plasma renin activities (PRA) were compared in 54 cases after six months. However, significant elevation of PRA did not occur in any case.  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