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   2896篇
  免费   201篇
  国内免费   17篇
耳鼻咽喉   32篇
儿科学   85篇
妇产科学   85篇
基础医学   298篇
口腔科学   75篇
临床医学   258篇
内科学   598篇
皮肤病学   86篇
神经病学   165篇
特种医学   73篇
外国民族医学   1篇
外科学   650篇
综合类   83篇
一般理论   4篇
预防医学   150篇
眼科学   99篇
药学   199篇
中国医学   23篇
肿瘤学   150篇
  2024年   4篇
  2023年   48篇
  2022年   68篇
  2021年   146篇
  2020年   89篇
  2019年   127篇
  2018年   154篇
  2017年   101篇
  2016年   101篇
  2015年   79篇
  2014年   130篇
  2013年   137篇
  2012年   242篇
  2011年   209篇
  2010年   121篇
  2009年   99篇
  2008年   138篇
  2007年   140篇
  2006年   143篇
  2005年   131篇
  2004年   92篇
  2003年   95篇
  2002年   81篇
  2001年   56篇
  2000年   56篇
  1999年   47篇
  1998年   17篇
  1997年   14篇
  1996年   9篇
  1995年   13篇
  1994年   6篇
  1993年   7篇
  1992年   24篇
  1991年   21篇
  1990年   26篇
  1989年   14篇
  1988年   15篇
  1987年   9篇
  1986年   15篇
  1985年   7篇
  1983年   4篇
  1980年   5篇
  1979年   10篇
  1978年   8篇
  1976年   5篇
  1975年   4篇
  1970年   4篇
  1969年   6篇
  1967年   4篇
  1966年   5篇
排序方式: 共有3114条查询结果,搜索用时 62 毫秒
1.
2.
Abdominal Radiology - Metastatic involvement of the ovaries is not rare. The most common tumor types metastasizing to the ovaries, from non-gynecological organs, are breast, colorectal, gastric,...  相似文献   
3.
Acute generalized exanthematous pustulosis (AGEP) is seen uncommonly in children and sometimes shows atypical clinical features in this population. Patch testing can be used effectively in children for the confirmation of the culprit drug in cases of multiple drug use. Here, we report a rare, pediatric case of ceftriaxone‐induced AGEP confirmed by patch testing with subsequent recurrence of the skin eruption.  相似文献   
4.
5.
This study evaluated the performance of a synthetic implant material, Hard Tissue Replacement Polymer, for: (1) ease of handling, (2) compatibility with bone and soft tissue, (3) stability of augmentation over time, and (4) development of untoward effects. HTR (a registered trademark of HTR Sciences, a division of United States Surgical Corporation, Norwalk, CT 06856) was implanted into 34 patients by means of five different surgical procedures. The material was found to be easy to manipulate during surgery. Tissue and bone compatibility, defined as absence of inflammation, was present in 32/34 surgical sites (94%). In extraction sites during the 18-month follow-up, no measurable decrease in bone height or width was seen. One patient with a large periodontal endodontic defect developed a post-operative infection necessitating extraction of the tooth. No induction of bone was seen in response to placement of HTR material.  相似文献   
6.
7.
Based upon the percentage of cases of IgA nephropathy (IgAN) in biopsy series, a lower prevalence has been assumed for African-Americans compared with Americans of European descent. This may be due to a racial difference in the basic underlying pathology of IgAN or to racial differences in patterns of referral and biopsy selection practices. Over the past decade (1985 – 1994), we have found similar incidences of IgAN in Caucasian and African-American children from Shelby County, Tennessee. The incidence was 3.0 cases per million per year for Caucasian and 5.7 cases per million per year for African-American children. IgAN may be more common in African-American children than previously appreciated. Population-based incidence studies will be necessary to determine whether or not our experience has become a more widespread phenomenon. Received August 21, 1996; received in revised form and accepted December 18, 1996  相似文献   
8.
Forty-three patients with neonatal tetanus admitted to the Infectious Diseases Ward of the Istanbul University Faculty of Medicine Children's Hospital at Capa from 1982-1989 are presented. Thirty-two (74.4%) of the subjects were boys. The overall mortality was found to be 60 percent and the mean incubation period 6.1 +/- 20 days. The mean period between onset of symptoms and hospital admission was 1.7 days. Thirty-nine (90.7%) of the 43 patients were unhygienic home deliveries and only two cases were delivered with a midwife in attendance. None of the mothers of the children in our series had been immunized with tetanus toxoid. The incidence of neonatal tetanus in Turkey is on the decline, but a fraction of the population, the so-called urban poor, is still at high risk for preventable diseases. Every contact an unvaccinated person has with a health care professional should be viewed as an opportunity for tetanus immunization.  相似文献   
9.
Activation of the complement cascade occurs in most cases of acute poststreptococcal glomerulonephritis (APSGN) and results in the formation of the terminal complement complexes (TCC). To examine the possible role of TCC in the pathogenesis of glomerular injury in APSGN, we studied 30 patients with the clinical diagnosis of APSGN. All patients had an elevated plasma SC5b-9 concentration at the onset of clinical nephritis. Serial plasma concentrations showed an inverse linear relationship with time after onset of clinical disease (r=–0.59,P=0.0008), while plasma C3 concentrations showed a positive linear relationship (r=0.78,P=0.0001). Renal biopsies of 5 patients demonstrated co-localization of C5b-9, S-protein, and C3 deposition in a glomerular capillary loop and mesangial distribution. Urinary excretion of TCC in the acute phase of APSGN was not elevated and was not a useful marker of disease activity. These data suggest that in APSGN with terminal complement pathway activation the local generation of TCC may contribute to the pathogenesis of the disease.  相似文献   
10.
The role of surgery in intraabdominal Burkitt's lymphoma remains controversial and different opinions are present in the literature. In our institution, forty patients (30 boys and 10 girls) with intraabdominal Burkitt's lymphoma with ages ranging from 3 to 12 years have been treated and followed from 1989 through 2000. In ten cases, the patients underwent surgery because of their acute abdominal diseases (intestinal obstruction in 5, intussusception in 3, intestinal perforation in one, and acute appendicitis in one). The remaining thirty patients were referred to our clinic because of their abdominal masses, pain, anorexia and fatigue. Twelve children had localized tumors and total resection could be performed. There was one death in this group due to central nervous system involvement during chemotherapy. In the remaining 28 children, extensive intraabdominal diseases were detected. In four of them, debulking procedures were performed, while in 24 children only biopsies could be made; 8 of them underwent a second-look operation. In the debulking procedures group, two children were lost (50 %) due to tumorlysis and acute renal failure. In the biopsy group, there were six deaths (25 %). All patients received chemotherapy after operative recovery. In conclusion, our results suggest that when the tumor is localized, total resection results in a good outcome. However, in the presence of extensive intraabdominal diseases instead of resection, the operation should be limited to biopsy only.  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