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   8714篇
  免费   648篇
  国内免费   15篇
耳鼻咽喉   126篇
儿科学   171篇
妇产科学   238篇
基础医学   1232篇
口腔科学   236篇
临床医学   853篇
内科学   1782篇
皮肤病学   209篇
神经病学   793篇
特种医学   307篇
外科学   1306篇
综合类   70篇
一般理论   2篇
预防医学   607篇
眼科学   215篇
药学   735篇
中国医学   17篇
肿瘤学   478篇
  2023年   56篇
  2022年   65篇
  2021年   144篇
  2020年   102篇
  2019年   152篇
  2018年   186篇
  2017年   131篇
  2016年   134篇
  2015年   146篇
  2014年   212篇
  2013年   388篇
  2012年   417篇
  2011年   398篇
  2010年   244篇
  2009年   221篇
  2008年   360篇
  2007年   423篇
  2006年   393篇
  2005年   369篇
  2004年   380篇
  2003年   330篇
  2002年   348篇
  2001年   249篇
  2000年   259篇
  1999年   208篇
  1998年   99篇
  1997年   93篇
  1996年   54篇
  1995年   87篇
  1994年   82篇
  1993年   74篇
  1992年   186篇
  1991年   206篇
  1990年   166篇
  1989年   157篇
  1988年   151篇
  1987年   167篇
  1986年   145篇
  1985年   150篇
  1984年   122篇
  1983年   107篇
  1982年   75篇
  1981年   57篇
  1980年   61篇
  1979年   119篇
  1978年   78篇
  1977年   67篇
  1976年   63篇
  1975年   54篇
  1973年   54篇
排序方式: 共有9377条查询结果,搜索用时 0 毫秒
1.
2.
Clinical versus ultrasonographic evaluation of scrotal disorders   总被引:1,自引:0,他引:1  
Clinical and ultrasonographic examinations of scrotal disorders were compared in 166 patients in order to determine their ability to distinguish between those diseases requiring surgery and those requiring clinical follow-up only. Ultrasound examinations were efficient in discriminating between normal and pathological findings. Extra-testicular lesions were readily differentiated from testicular ones. Although both clinical and ultrasonographic examinations had high sensitivity (90%) in detecting testicular cancer, the number of false positive findings was smaller after ultrasound examination. This gave a predictive value of a positive test of 53% after ultrasound examination but only 33% after clinical examination. Ultrasound examination may, therefore, reduce the number of surgical explorations in the scrotum and should be performed in patients with suspected testicular pathology based on history and palpatory findings.  相似文献   
3.
4.
Recurrent hip dislocation in intermediate spinal atrophy   总被引:1,自引:0,他引:1  
Recurrent hip dislocation after corrective orthopaedic surgery in children and teenagers with intermediate spinal atrophy has not been reported in the literature. Four cases with long-term follow-up are presented. These represent the only cases surgically treated in 30 years of following spinal atrophy patients. Thus, it seems significant that all hips redislocated after the surgical procedure. In addition, two patients had second operations with subsequent dislocation. Pelvic obliquity should not be the basis for the surgery, as spinal fusion is generally necessary for wheelchair users. The sagacity of performing surgery for hip dislocations is raised.  相似文献   
5.
The time aspects of daily use of a clinical database system in an endoscopy department were studied. The SADE database system for endoscopic procedures was introduced for daily use at Ullev?l Hospital on 1 January 1989. The average weekly programme of the endoscopy unit includes 57 gastroduodenoscopies, 23 colonoscopies and 12 ERCP/EPTs. During three consecutive weeks of the study the mean physician input time was 4 min 17 sec per patient (range 57 sec to 15 min), individual variation depending mainly on the extent of the report. Assistants spent a mean time of 4 min 23 sec for each patient. Thus, a total of 8 min 40 sec was spent for every patient seen. Endoscopic units should analyze their routines and needs before introducing an electronic data base manager.  相似文献   
6.
Septic pelvic thrombophlebitis is an uncommon complication in obstetrics and gynecology that may be difficult to diagnose clinically. Computed tomography (CT), an accurate and noninvasive modality, has greatly aided in the diagnosis of this disorder. In a case of septic pelvic thrombophlebitis complicating second-trimester pregnancy termination, CT enabled the correct diagnosis to be made and treatment to be initiated.  相似文献   
7.
The county of Vestfold in the South-eastern part of Norway has undergone two incidence and prevalence surveys on multiple sclerosis. The prevalence of definite/probable MS on January 1.1963 was 61.6/100000. Based on the same diagnostic criteria, the present study reports a slight increase in prevalence to 86.4/100000 on January 1st 1983. The average annual incidence was calculated for 5 years periods from 1953 to 1983. The time periods 1953–1962 and 1973–1977 showed age-adjusted incidence rates between 4.50 and 5.49/100000 while the 10–year period 1963–1972 showed significantly lower rates. The fluctuating pattern of MS incidence and prevalence over time supports the view that MS is not a stable disease, and that exogenous factors are influencing the disease pattern.  相似文献   
8.
Dynamic aspects of expanding cava septi pellucidi et Vergae   总被引:2,自引:0,他引:2  
Summary Two paediatric patients with expanding cysts of the cava Vergae et septi pellucidi are presented. In the first patient, consecutive CT scans showed agrowing cavum thought to be responsible for his dramatic increase in head circumference. In the other patient, the expanding cavum was discovered because a routine skull X-ray after minor head trauma revealed marked impressiones digitatae.Both patients were successfully treated with stereotactically placed internal shunts from the cysts via the lateral ventricle to the subarachnoid space. During this procedure, contrast medium was instilled, and the cysts were visualized on postoperative CT scans.Some dynamic aspects of such expanding cava are discussed.  相似文献   
9.
1. Kidneys from rats given an intraperitoneal dose of 4,4'-bis[( 3H]methylsulphonyl)-2,2',5,5'- tetrachlorobiphenyl[(CT3SO2)2TCB)] contained (CT3SO2)2TCB associated with a protein which has been isolated and characterized by SDS-polyacrylamide gel electrophoresis (SDS-PAGE), immunoblot and immunodiffusion analysis to be alpha 2 mu-globulin (alpha 2 mu). 2. The same radioactive alpha 2 mu-globulin complex was isolated from urine of rats given an i.p. dose of (CT3SO2)2TCB. This complex represented 12.3% (0.27% dose) and 9.3% (0.06% dose) of the radioactivity excreted in 0-24 h and 24-48 h urine, respectively. 3. The radioactivity was extractable from alpha 2 mu and characterized by t.l.c. (co-chromatography in two solvent systems) to be (CT3SO2)2TCB. 4. A radioactive-protein complex was isolated from urine of mice given an i.p. dose of (CT3SO2)2 TCB. The radioactive-protein complex was characterized to be mouse major urinary protein (MUP) by SDS-PAGE, immunoblot and immunodiffusion analysis. This complex was not detected in mouse kidney. 5. Urinary excretion of radioactive-MUP complex represented 51.7% (2.3% dose) and 28% (1.3% dose) of the radioactivity excreted in 0-24 h and 24-48 h urine, respectively.  相似文献   
10.
Hypothesis: Pathogenesis of postmenopausal hot flush   总被引:1,自引:0,他引:1  
The pathogenesis of postmenopausal hot flush is still poorly understood. A hypothesis is presented where the perimenopausal decline in circulating estrogen levels may increase central norepinephrine and LH-RH secretion and produce a downward setting of the central thermostat resulting in a hot flush.  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