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   117447篇
  免费   6006篇
  国内免费   139篇
耳鼻咽喉   1796篇
儿科学   5340篇
妇产科学   3937篇
基础医学   16236篇
口腔科学   2846篇
临床医学   8422篇
内科学   22261篇
皮肤病学   3373篇
神经病学   9047篇
特种医学   5084篇
外国民族医学   32篇
外科学   19215篇
综合类   1675篇
一般理论   30篇
预防医学   5891篇
眼科学   3424篇
药学   8164篇
中国医学   335篇
肿瘤学   6484篇
  2018年   938篇
  2017年   803篇
  2016年   1121篇
  2015年   1250篇
  2014年   1660篇
  2013年   2413篇
  2012年   3188篇
  2011年   3243篇
  2010年   2020篇
  2009年   1967篇
  2008年   3312篇
  2007年   3558篇
  2006年   3696篇
  2005年   3789篇
  2004年   3753篇
  2003年   3602篇
  2002年   3550篇
  2001年   7050篇
  2000年   6991篇
  1999年   5890篇
  1998年   1627篇
  1997年   1568篇
  1996年   1343篇
  1995年   1211篇
  1994年   1097篇
  1993年   1132篇
  1992年   3787篇
  1991年   3600篇
  1990年   3585篇
  1989年   3367篇
  1988年   2995篇
  1987年   2906篇
  1986年   2806篇
  1985年   2638篇
  1984年   1953篇
  1983年   1608篇
  1982年   934篇
  1981年   923篇
  1980年   769篇
  1979年   1831篇
  1978年   1358篇
  1977年   1120篇
  1976年   941篇
  1975年   1183篇
  1974年   1215篇
  1973年   1206篇
  1972年   1049篇
  1971年   977篇
  1970年   882篇
  1969年   795篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
81.
As a prerequisite to the use of the Finnish National Hospital Discharge Register in psychiatric epidemiological research, we studied the diagnostic reliability of the register in terms of the psychiatric morbidity experienced by a national birth cohort. We investigated all entries to the register for a sample based upon the Northern Finland 1966 birth cohort at the age of 16 years (n=11017). Until the end of 1993 (age 27 years), a total of 563 subjects had a register diagnosis indicating a psychiatric illness, 37 of them being schizophrenia. When operational criteria (DSM-III-R) were applied to clinical information in the available original hospital records for cases of psychosis, personality disorder and substance abuse (n=249), 71 fulfilled criteria for schizophrenia, including all of the 37 cases in the register and an additional 34 (48% false-negatives), most frequently diagnosed in the register as schizophreniform or other psychosis. Despite the official use of DSM-III-R nomenclature, it appears that the clinical concept of schizophrenia in Finland, manifest within the register, remains very restrictive. The application of operational criteria is a necessary prerequisite for scientific research on schizophrenia.  相似文献   
82.
Acute ischaemia of the vertebrobasilar circulation leads to a variety of clinical manifestation and is mostly due to cardiogenic or artery-to-artery embolism. We describe four neurological emergency situations involving vertebrobasilar artery aclusion of other origins: basilar migraine, extrinsic compression by rheumatoid inflammatory tissue, generalized vasculitis in subacute rheumatic fever and basilar artery dissection. The differential diagnosis of acute vertebrobasilar artery occlusion may have an important impact on patient management.  相似文献   
83.
Patients with moderately severe Parkinson's disease complicated by the adverse effects of chronic levodopa use benefited from the addition of bromocriptine (Parlodel; Sandoz) in doses up to 26 mg daily, which allowed an approximate 30% reduction of levodopa dose. This resulted in a significant decrease in the amount of levodopa side-effects while maintaining or improving the original parkinsonian clinical stage. Increased effectiveness in these patients was not associated with increased dosage beyond 25-30 mg daily. When the doses of bromocriptine were increased slowly, the adverse reactions were minor and usually transient.  相似文献   
84.
The ileal neobladder produces a completely detubularized, low pressure, high capacity reservoir constructed from ileum without any valves. From April 1986 through May 1989, 113 patients underwent this procedure at our institution. Of these patients 99 underwent simultaneous radical cystectomy for bladder cancer and 14 underwent bladder augmentation. The mean postoperative followup was 14.4 months, with a range of 1 to 36 months. There was no perioperative mortality. However, 7 patients died more than 2 months postoperatively: 5 of tumor progression, 1 of pneumonia and severe metabolic acidosis, and 1 of septicemia of unknown cause. Reoperation was necessary in only 13 patients; 10 patients required urethrotomy or dilation of urethral strictures. Day and night continence was preserved in 82.1% of all patients. Stress incontinence, which must be corrected by an artificial sphincter, was found in 4 patients (4.2%) and night-time incontinence that required an external device occurred in 5 (5.3%). Eight patients (8.4%) with mild stress incontinence required no further treatment. Pressure waves exceeding 22 cm. water seldom occurred and then only at maximum capacity. Our experience with this relatively simple system without a nipple is an overwhelming success. The need for reoperation is extraordinarily low and the high reservoir capacity results in continence from the beginning in most patients. The concept is sound and offers a genuine alternative to any form of cutaneous urinary diversion with an incidence of complications not higher than after standard supravesical urinary diversion.  相似文献   
85.
In 15 patients with the postburn neck deformation, the plasty with a musculocutaneous flap of the musculus pectoralis major was employed. Use of the technique permits to avoid prolonged immobilization of a neck. A good functional and cosmetic result has been noted.  相似文献   
86.
Liver transplantation in HBsAg positive patients   总被引:1,自引:0,他引:1  
  相似文献   
87.
88.
Controversy exists about the value of ultrasonography of meniscal tears. We therefore examined 101 knee joints of 99 patients in a prospective study. Prior to the arthroscopy the menisci were scanned from an independent team by using 7.5 and 10.0 MHz ultrasound waves. 81 meniscal tears were seen at arthroscopy; 36% of these tears could not be detected with the scanner (? false negative results) while 20% of intact menisci showed positive echogenic structures, which were analysed as meniscal tears. It seems that ultrasonography of the menisci is still of experimental use without any clinical importance.  相似文献   
89.
90.
After lindane administration in daily doses of 0.1 LD50 for one month (total dose 2.0 LD50) changes in the erythrocytes were found persisting for up to 4 months after withdrawal of the pesticide. A significant increase in the number of echinocytes, a greater per cent of reticulocytes, significantly raised level of denatured haemoglobin, and an increased number of erythrocytes of higher sensitivity to oxidating factors in relation to control group was observed.  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