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   179935篇
  免费   1341篇
  国内免费   22篇
耳鼻咽喉   1178篇
儿科学   6855篇
妇产科学   3123篇
基础医学   16952篇
口腔科学   1620篇
临床医学   12787篇
内科学   32221篇
皮肤病学   742篇
神经病学   16635篇
特种医学   9022篇
外科学   29428篇
综合类   2415篇
一般理论   4篇
预防医学   18339篇
眼科学   2967篇
药学   9697篇
中国医学   664篇
肿瘤学   16649篇
  2023年   65篇
  2022年   165篇
  2021年   249篇
  2020年   128篇
  2019年   171篇
  2018年   22092篇
  2017年   17461篇
  2016年   19616篇
  2015年   1024篇
  2014年   997篇
  2013年   962篇
  2012年   7290篇
  2011年   21299篇
  2010年   18941篇
  2009年   11647篇
  2008年   19689篇
  2007年   21895篇
  2006年   717篇
  2005年   2324篇
  2004年   3537篇
  2003年   4490篇
  2002年   2622篇
  2001年   359篇
  2000年   523篇
  1999年   263篇
  1998年   243篇
  1997年   239篇
  1996年   119篇
  1995年   118篇
  1994年   110篇
  1993年   67篇
  1992年   135篇
  1991年   139篇
  1990年   189篇
  1989年   131篇
  1988年   126篇
  1987年   93篇
  1986年   76篇
  1985年   90篇
  1984年   55篇
  1983年   41篇
  1982年   41篇
  1980年   48篇
  1979年   51篇
  1974年   35篇
  1969年   41篇
  1938年   61篇
  1934年   31篇
  1932年   56篇
  1930年   47篇
排序方式: 共有10000条查询结果,搜索用时 267 毫秒
991.

Aims  

The present study was under taken to evaluate the efficacy of various local and regional soft tissue flaps used for reconstruction after excision of various malignant lesions of the mouth and also to evaluate complications with length of hospital stay after the reconstruction.  相似文献   
992.
993.
994.
Sinusitis is a frequent complication of respiratory tract infections. Probiotics are perceived to be useful in infections, allergies, and inflammations. Our prospective trial stratified 204 children with recurrent rhinosinusitis by age (2–11 years, 54m:64f; 12–18 years, 39m:47f) and assigned them to standard treatment (antibiotics, anticongestants) or additional 60 days Symbioflor-1 (SF1; Enterococcus faecalis 1.5–4.5x107 CFU). The number of sinusitis episodes was lower in SF1-treated patients (2.52±0.91) than among controls (3.27±1.36; p=0.01). Mean duration of the first sinusitis episode was 11.9±8.6 days with SF1, whereas it was 16.1±12.9 days in the younger controls (p=0.023) and 9.86±5.05 days in the elder controls (n.s.). Duration of subsequent sinusitis episodes was also shorter in SF1 patients (15.2±13.6 days) compared with controls (22.7±14.8 days; p=0.030). No adverse events were observed. Probiotic Enterococcus faecalis adjuvant to conventional therapy can reduce the number and duration of rhinosinusitis episodes in children and adolescents.  相似文献   
995.
Renal osteodystrophy (ROD) is a metabolic skeletal pathology that frequently affects the orofacial region and presents with characteristic radiological manifestations. This paper reports a case of ROD causing diffused orofacial bone alterations in a female patient with end-stage chronic kidney disease. The radiological features on panoramic, posteroanterior and lateral skull and computed tomography radiographs are described for this case. Previous reports in the literature are reviewed and discussed with a focus on radiological characteristics and differential diagnoses.  相似文献   
996.
Randomized clinical trials (RCTs) are relied upon for determining the standard of care and changes to the standard of care in oncology. Through data sharing, the pooled individual patient data (IPD) from these trials can provide high-quality sources and enriched power for analyses beyond the original goals of each trial. To address important scientific questions in early-stage colon cancer, the Adjuvant Colon Cancer End Points (ACCENT) Collaborative Group has continuously integrated IPD from large adjuvant colon cancer RCTs conducted worldwide. Through June 2016, IPD from over 40,000 patients from 27 major trials (1977 to 2009) have been assembled. Over the past 20 years, a variety of clinical questions have been investigated and addressed by ACCENT collaborations. Many of the findings have provided additional understanding of treatment mechanisms, suggested changes or reinforced quality patient care, and informed and improved the design for the current and next generation of RCTs. We review these significant contributions from the ACCENT collaboration.  相似文献   
997.
Autism spectrum disorder (ASD) is a neurodevelopmental disorder afflicting about one in every 68 children. It is behaviorally diagnosed based on a triad of symptoms, including impairment in communication, impairment in sociability and abnormal and stereotypic behavior. The subjectivity of behavioral diagnosis urges the need for clinical biomarker tests to improve and complement ASD diagnosis and treatment. Over the past two decades, researchers garnered a broad range of biomarkers associated with ASD and often correlating with the severity of ASD, which includes metabolic and genetic biomarkers or neuroimaging abnormalities. Metabolic biomarkers are either involved in key pathways such as a trans-sulfuration pathway or produced due to the derangement of these pathways in the case of oxidative stress. Recent studies reported several genetic abnormalities related to ASD, encompassing various mechanisms, from copy number variations (CNVs) and single nucleotide polymorphisms (SNPs) to chromosomal anomalies. However, it is still premature to consider these genetic variants as true biomarkers for ASD, due to their low reproducibility and regional-specific nature. Herein, we comprehensively review state of the art about major biomarkers reported in ASD and the association of some biomarkers with ASD symptoms and severity. It is important to establish those biomarkers to be able to help in the diagnosis and to optimize the treatment of ASD.  相似文献   
998.
Agency leaders and therapists are essential stakeholders in implementation of evidence-based practices (EBPs) within publicly-funded mental health services. Little is known about how these stakeholders differ in their perceptions of specific EBPs and which individual and organizational factors differentially influence these perceptions. Within the context of a system-driven implementation of multiple EBPs, survey data from 160 leaders and 720 therapists were examined to assess differences in perceptions of six EBPs. Findings indicated that leaders and therapists have unique perspectives and preferences regarding EBPs that are shaped by distinct sociodemographic and professional characteristics and aspects of organizational functioning.  相似文献   
999.
1000.
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