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   10823篇
  免费   998篇
  国内免费   200篇
耳鼻咽喉   114篇
儿科学   382篇
妇产科学   252篇
基础医学   747篇
口腔科学   285篇
临床医学   1674篇
内科学   2528篇
皮肤病学   247篇
神经病学   552篇
特种医学   290篇
外国民族医学   4篇
外科学   2391篇
综合类   228篇
一般理论   2篇
预防医学   746篇
眼科学   429篇
药学   561篇
中国医学   70篇
肿瘤学   519篇
  2023年   181篇
  2022年   171篇
  2021年   395篇
  2020年   270篇
  2019年   247篇
  2018年   332篇
  2017年   333篇
  2016年   391篇
  2015年   354篇
  2014年   486篇
  2013年   610篇
  2012年   553篇
  2011年   603篇
  2010年   488篇
  2009年   543篇
  2008年   442篇
  2007年   312篇
  2006年   362篇
  2005年   310篇
  2004年   230篇
  2003年   214篇
  2002年   203篇
  2001年   138篇
  2000年   98篇
  1999年   168篇
  1998年   207篇
  1997年   225篇
  1996年   324篇
  1995年   283篇
  1994年   217篇
  1993年   138篇
  1992年   140篇
  1991年   142篇
  1990年   83篇
  1989年   155篇
  1988年   124篇
  1987年   103篇
  1986年   117篇
  1985年   91篇
  1984年   95篇
  1983年   91篇
  1982年   80篇
  1981年   75篇
  1980年   87篇
  1978年   64篇
  1977年   50篇
  1976年   47篇
  1975年   51篇
  1964年   49篇
  1963年   47篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
BACKGROUND: Abnormalities in calcium and vitamin D metabolism have been reported after bariatric surgery. The purpose of this study was to evaluate vitamin D nutritional status among morbidly obese patients before gastric bypass surgery. METHODS: We prospectively studied 279 morbidly obese patients seeking gastric bypass surgery for vitamin D nutritional status as assessed by serum 25-hydroxyvitamin D level. In addition, serum samples were analyzed for calcium, alkaline phosphatase (AP), intact parathyroid hormone (PTH), and 1,25-dihydroxyvitamin D. RESULTS: Mean patient age was 43 +/- 9 years; 87% of the study patients were women, and 72% were white. Serum calcium and AP levels were normal in 88% and 89% of the patients, respectively. Vitamin D depletion, defined as serum 25-hydroxyvitamin D level 相似文献   
6.
7.
8.
The Low Vision Clinic at the Palmerston North Hospital has now been oerating for 70 years. Over the course of these ten years a number of factors have emerged which can be as readily applied to general ophthalmological practice as to low vision practice. The philosophy of low vision care is one of which all ophthalmologists should be aware and includes factors to be taken into account when dealing with children, people in the workplace, and everyday factors involved in daily living activities, all of which are equally relevant in routine ophthalmological practice. This paper endeavours to share some thoughts on these factors and also discusses means by which the visually handicapped can be helped in areas where specialist low vision services are not readily available.  相似文献   
9.
Xanthogranulomatous orchitis is an extremely rare inflammatory non-neoplastic destructive lesion of the testis. We report a 44-year-old man who presented with right scrotal swelling and two discharging sinuses. Testicular tumor markers were normal. Scrotal ultrasound showed heterogeneous testicular areas and irregular margin of the tunica. Surgical exploration revealed infected, unhealthy testicular tissue with necrosis and tumor-like lesion. Orchidectomy was done and histopathology showed xanthogranulomatous orchitis.  相似文献   
10.
A. S. C. Rice  MB  BS  Registrar  F. Reynolds  MD  FFARCS 《Anaesthesia》1987,42(12):1320-1323
Forty women who underwent gynaecological surgery were randomly allocated to receive trichloroethylene, enflurane, or enflurane plus fentanyl as adjuncts to nitrous oxide/relaxant anaesthesia with controlled ventilation. No serious cardiac dysrhythmias were seen in any group. Each patient was observed postoperatively for 4 hours by a nurse blind to the technique used, and questioned at 24 hours by a similarly blinded anaesthetist. Recovery after trichloroethylene was not significantly prolonged although postoperative analgesia by visual analogue was better, opiate analgesia was required less frequently and there was less nausea and vomiting than in either of the enflurane groups. We argue for the continued use of trichloroethylene by this technique, because it costs one hundred times less than enflurane and because of the potential morbidity of the postoperative opiate dosage required after enflurane.  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