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   3111篇
  免费   166篇
  国内免费   8篇
耳鼻咽喉   46篇
儿科学   237篇
妇产科学   73篇
基础医学   271篇
口腔科学   63篇
临床医学   182篇
内科学   662篇
皮肤病学   65篇
神经病学   292篇
特种医学   61篇
外科学   499篇
综合类   52篇
现状与发展   1篇
一般理论   3篇
预防医学   100篇
眼科学   179篇
药学   231篇
中国医学   7篇
肿瘤学   261篇
  2023年   24篇
  2022年   47篇
  2021年   136篇
  2020年   64篇
  2019年   85篇
  2018年   110篇
  2017年   64篇
  2016年   80篇
  2015年   86篇
  2014年   104篇
  2013年   137篇
  2012年   205篇
  2011年   246篇
  2010年   158篇
  2009年   115篇
  2008年   177篇
  2007年   192篇
  2006年   151篇
  2005年   160篇
  2004年   105篇
  2003年   95篇
  2002年   78篇
  2001年   56篇
  2000年   56篇
  1999年   49篇
  1998年   22篇
  1997年   22篇
  1996年   16篇
  1995年   11篇
  1992年   32篇
  1991年   31篇
  1990年   25篇
  1989年   19篇
  1988年   28篇
  1987年   17篇
  1986年   14篇
  1985年   18篇
  1984年   12篇
  1983年   16篇
  1982年   14篇
  1981年   10篇
  1979年   11篇
  1978年   19篇
  1977年   21篇
  1976年   12篇
  1975年   11篇
  1974年   21篇
  1973年   14篇
  1972年   15篇
  1970年   14篇
排序方式: 共有3285条查询结果,搜索用时 15 毫秒
1.
2.
3.
It is difficult to distinguish between carcinoid tumors of the pancreatic head and periampullary region and carcinomas preoperatively. Between 1996 and 2002, 125 consecutive pancreaticoduodenectomies done by us for periampullary tumors (14 carcinoids, 111 carcinomas) were analyzed. Patients with carcinoid tumors had significantly younger mean age (48 vs. 54 years), longer history (32 vs. 8 weeks), lower serum total bilirubin levels (1.4 vs. 6.3 mg/dL) and on CT scan, had larger, well-localized tumors (5 cm vs. 2 cm). Their postoperative course was better with no mortality or major morbidity, whereas after resection for carcinoma 7 (6.3%) patients died and 30 (27%) had major postoperative complications. Thus, a tumor of this region in a young patient with indolent history, low bilirubin level and with CT scan depicting a large expansile lesion suggests a carcinoid. Such tumors may be safely resected with low postoperative morbidity and mortality and good long-term prognosis.  相似文献   
4.
5.
Introduction Myxopapillary ependymomas are low grade tumours that are known to recur locally even after complete excision, but metastasis to distant sites is extremely uncommon. Case report We report an unusual case of lumbo-sacral myxopapillary ependymoma in a 13-year-old boy with metastasis to both cerebellopontine angles. To the best of our knowledge, this is the youngest patient of metastatic myxopapillary ependymoma.  相似文献   
6.
Our experience of single-stage repair of severe hypospadias (penoscrotal, scrotal, and perineal) in 30 children using urinary bladder mucosa for urethroplasty is reported. These children had severe chordee, small prepuce, and often ventral transposition of the penis with bifid scrotum where Devine and Horton, Asopa, or Duckett techniques are not so suitable. The graft uptake was uniformly satisfactory. Ten patients had complications; most of the fistulae healed spontaneously. Surgical intervention was required in 2 cases only: 1 for a fistula and another for a stricture with fistula. Meatal stenosis, seen in 4 cases, led to delayed distal fistulae in 2, which healed spontaneously with meatal dilatation. Regular dilatation of the external meatus is recommended to prevent this problem.  相似文献   
7.
Twenty-four cases of trichotillomania attending psychiatry outpatient department and child guidance clinic at Kalawati Saran Children's and Smt Sucheta Kriplani Hospitals over a period of 2 years from July, 1985 to November 1987 were studied. Females (66.7%) outnumbered the males (33.3%). Majority of cases belonged to age group 6-10 years (54.2%) and nuclear family (68.5%). Nail-biting (25.0%) was the commonest associated neurotic trait, followed by enuresis (20.9%), temper-tantrum (12.5%), etc. A past history of hysterical fits and neurotic depression was found in 3 cases (12.5%) and 2 cases (8.3%) respectively. Family history of neurosis was seen in mothers and fathers of 20.9% and 12.5% cases respectively. Trichobezoars and trichophytobezoars were found in 6 cases (25.0%) and 3 cases (12.5%) respectively. Majority of patients of trichobezoars presented with vague complaints like heaviness in the stomach (55.6%), inability to gain weight (44.4%), etc, while 22.2% cases were asymptomatic and detected only on screening.  相似文献   
8.
9.
10.
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