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   9835篇
  免费   747篇
  国内免费   43篇
耳鼻咽喉   97篇
儿科学   352篇
妇产科学   148篇
基础医学   1404篇
口腔科学   146篇
临床医学   903篇
内科学   1840篇
皮肤病学   211篇
神经病学   1134篇
特种医学   423篇
外国民族医学   5篇
外科学   1482篇
综合类   70篇
现状与发展   1篇
一般理论   6篇
预防医学   522篇
眼科学   229篇
药学   951篇
中国医学   4篇
肿瘤学   697篇
  2021年   114篇
  2020年   82篇
  2019年   100篇
  2018年   153篇
  2017年   114篇
  2016年   162篇
  2015年   178篇
  2014年   197篇
  2013年   280篇
  2012年   379篇
  2011年   431篇
  2010年   223篇
  2009年   207篇
  2008年   351篇
  2007年   406篇
  2006年   403篇
  2005年   365篇
  2004年   424篇
  2003年   398篇
  2002年   324篇
  2001年   338篇
  2000年   333篇
  1999年   267篇
  1998年   114篇
  1997年   111篇
  1996年   99篇
  1995年   84篇
  1994年   80篇
  1993年   83篇
  1992年   224篇
  1991年   221篇
  1990年   213篇
  1989年   247篇
  1988年   223篇
  1987年   203篇
  1986年   190篇
  1985年   212篇
  1984年   142篇
  1983年   98篇
  1982年   87篇
  1981年   85篇
  1980年   89篇
  1979年   140篇
  1978年   94篇
  1977年   83篇
  1976年   108篇
  1975年   105篇
  1974年   96篇
  1971年   87篇
  1970年   83篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
92.
Twenty-two consecutive patients (23 wrists) underwent open reduction internal fixation of dorsal perilunate dislocations and fracture-dislocations through combined dorsal and volar approaches. One of 5 experienced wrist surgeons performed these procedures within an average of 3 days of injury (range, 0-26 days) and intercarpal fixation was kept within the proximal carpal row. Motion was instituted an average of 10 weeks (range, 5-16 weeks) after injury. All patients were males. The average age at the time of injury was 32 years (range, 16-60 years). The average follow-up period was 37 months (range, 13-65 months). Average flexion-extension motion arc and grip strength in the injured wrist were 57% and 73%, respectively, compared with the contralateral wrist. The scapholunate angle increased and the revised carpal height ratio decreased over time, which was statistically significant for both measurements. Three patients (3 wrists) required wrist arthrodesis and a fourth patient had an immediate scaphoid excision and 4-corner arthrodesis secondary to an irreparable scaphoid fracture. One patient required a proximal row carpectomy to treat septic arthritis. Nine of the remaining 18 wrists had radiographic evidence of arthritis, most often at the capitolunate or scaphocapitate articulations. Short form-36 mental summary scores were significantly greater than age- and gender-matched US population values; physical summary scores were significantly less. The disabilities of arm, shoulder, and hand evaluation, Mayo wrist score, and patient-rated wrist evaluation all reflected loss of function. Seventy-three percent of all patients had returned to full duties in their usual occupations and a total of 82% were employed.  相似文献   
93.
94.
95.
PURPOSE: Preclinical studies indicate positive interactions between capecitabine, an oral fluorouracil precursor, and gemcitabine, the current standard treatment for advanced pancreatic carcinoma (APC). In this study, we investigated the addition of capecitabine to gemcitabine treatment for patients with APC. PATIENTS AND METHODS: This multicenter study included patients na?ve to chemotherapy who had histologically or cytologically confirmed, nonresectable or metastatic pancreatic carcinoma. Gemcitabine was given at a fixed dose of 1,000 mg/m(2) on days 1 and 8 of a 21-day cycle. Capecitabine was given in increasing doses orally bid for 14 days followed by a 1-week rest. The maximum-tolerated dose (MTD) was defined as one dose level below the dose causing dose-limiting toxicity (DLT) in >or= one third of a cohort of six patients. We included an additional 15 patients at the MTD. RESULTS: Thirty-six patients were included. DLT occurred at a dose of 800 mg/m(2) bid of capecitabine and consisted of myelotoxicity and mucositis. Hand-foot syndrome was not observed, and other toxic effects were mild. Thus, in this regimen, the recommended dose of capecitabine is 650 mg/m(2) bid. In 27 patients with measurable disease, we observed one complete and four partial remissions. In addition, significant drops (> 50% from baseline value) of the tumor marker CA 19-9 occurred in 14 of 24 assessable patients. CONCLUSION: The combination of capecitabine and gemcitabine is well tolerated, with apparent efficacy in patients with APC. Therefore, it is currently being compared with gemcitabine monotherapy in a phase III study.  相似文献   
96.
97.
Over a period of 4 years, 39 children with lymphadenitis were treated surgically; in 31 cases cervical lymph nodes were the main location. In 9 cases the lymphadenitis was caused by mycobacterial infection.Staphylococcus aureus was the most frequent causative organism of unspecific lymphadenitis (11 cases). The therapy of choice appears to be surgical treatment and medical care after operation. Especially in mycobacterial lymphadenitis, complete surgical excision of the lymph node is decisive for definitive healing. There was only 1 case of therapy-resistant, relapsing cervical lymphadenitis that needed a second operation. Causative organisms in this case wereMycobacterium avium andMycobacterium intracellulare. All other patients showed an uneventful postoperative clinical course. We believe that a consequent diagnostic process and cooperation between the pediatric surgeon and pediatrician are necessary for effective therapy.  相似文献   
98.
99.
The purpose of this study was to evaluate the influence on fetal cell growth in vitro of rapidly changing magnetic gradient fields such as those produced by the gradient coils of a typical magnetic resonance (MR) imager. The static magnetic field and the radiofrequency pulses were disabled during all measurements. Human fetal fibroblasts were placed within a specially designed MR-compatible incubation system inside the magnet. Trapezoid-shaped waveforms of 500 and 75 Hz base frequency and an amplitude of 2 mT were applied for 2-24 hours. Proliferation of the cells was monitored for 3 weeks after exposure. Cell cycle analysis was performed until 24 hours after exposure to detect alterations in cell division. Tests were performed under two different conditions of growth to detect increased as well as decreased proliferation effects. None of these tests showed differences in proliferation and cell cycle distribution between exposed and nonexposed cells.  相似文献   
100.
A traumatic abdominal wall hernia was observed in association with a colonic laceration due to a pelvic fracture. The presence of this specific combination of injuries is a rare clinical entity. CT evaluation with intravenous and bowel contrast media identified the traumatic abdominal wall hernia and the bowel entrapment.  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