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   2963篇
  免费   244篇
  国内免费   33篇
耳鼻咽喉   5篇
儿科学   107篇
妇产科学   83篇
基础医学   405篇
口腔科学   71篇
临床医学   346篇
内科学   497篇
皮肤病学   26篇
神经病学   245篇
特种医学   317篇
外科学   386篇
综合类   109篇
一般理论   4篇
预防医学   320篇
眼科学   31篇
药学   175篇
中国医学   4篇
肿瘤学   109篇
  2023年   9篇
  2022年   12篇
  2021年   52篇
  2020年   30篇
  2019年   43篇
  2018年   55篇
  2017年   45篇
  2016年   38篇
  2015年   57篇
  2014年   79篇
  2013年   92篇
  2012年   106篇
  2011年   119篇
  2010年   98篇
  2009年   98篇
  2008年   121篇
  2007年   142篇
  2006年   136篇
  2005年   117篇
  2004年   121篇
  2003年   114篇
  2002年   110篇
  2001年   103篇
  2000年   100篇
  1999年   92篇
  1998年   84篇
  1997年   97篇
  1996年   100篇
  1995年   64篇
  1994年   51篇
  1993年   63篇
  1992年   67篇
  1991年   57篇
  1990年   54篇
  1989年   69篇
  1988年   74篇
  1987年   53篇
  1986年   53篇
  1985年   53篇
  1984年   19篇
  1983年   23篇
  1982年   17篇
  1981年   11篇
  1980年   14篇
  1979年   9篇
  1978年   10篇
  1977年   16篇
  1976年   14篇
  1975年   10篇
  1973年   7篇
排序方式: 共有3240条查询结果,搜索用时 109 毫秒
1.
Background: There are evidence-practice gaps in all areas of aphasia management across the continuum of care. Despite the recognition that effective implementation strategies are needed to improve the consistency of speech pathologists’ aphasia management practices, there have been few studies investigating this important issue. Therefore, little is known about the effectiveness of implementation strategies in the field of aphasiology. In light of the developing field of knowledge translation, it is important to review the aphasia implementation literature to highlight current trends, draw together findings, and determine future implementation research needs.

Aims: To critically review, summarise, and discuss the implementation literature in the field of aphasiology to date, in order to guide clinical aphasiologists to work towards closing the evidence-practice gaps in aphasia management.

Main contribution: A review of the literature in this developing area of expertise in the field of aphasiology, with examples of practical applications.

Conclusions: Only six implementation studies have been published in aphasia (related to conversation partner training, discourse analysis, information provision, and collaborative goal-setting practices), showing there is a need for capacity building in this area. Therefore, we are not yet able to state what interventions are effective in which context, nor fully understand how behaviour change occurs for clinicians providing aphasia management. Implications for speech-language pathologists are discussed. An overarching call to action is the need for clinicians and researchers to work together to drive future implementation efforts that can succeed in closing the aphasia management evidence-practice gaps.  相似文献   

2.

Introduction

Transplant units are exploring strategies to increase the availability of donor kidneys. The use of en-bloc kidney transplantation (EBKT) from paediatric donors represents one potential solution. We present our long-term experience with paediatric EBKT among adult recipients.

Methods

Twenty-three paediatric to adult EBKTs were performed by the Irish National Kidney Transplant Service between 1990 and 2016. The primary outcome variable was long-term en-bloc allograft survival rate. Secondary outcome variables were incidence of allograft thrombosis, incidence of delayed graft function, overall patient survival and serum creatinine at most recent follow-up. Outcomes were compared to single kidney transplant recipients from the same time period.

Results

Mean donor age was 1.8 ± 0.97 years (range: 7 months to 3 years). Recipient age was 46 ± 12 years. Mean follow-up was 133 ± 64 months (range: 36–264). Overall graft survival was 100%, 91% and 80% after 1, 5 and 10 years respectively, compared to 92%, 79% and 61% in single kidney transplant recipients (p = 0.04). There were 5 cases of allograft failure, 3 due to death from unrelated causes. Median time to graft failure was 108 months (range: 36–172). Mean serum creatinine was 72.6 ± 21.6 μmol/l after the follow-up period. There were no cases of graft thrombosis or delayed graft function. Overall survival was 96.4%, 88.0%, 76.23% and 50.5% at 1, 5, 10 and 20 years respectively.

Conclusion

En-bloc paediatric kidney transplantation is associated with excellent long-term allograft and patient survival and is a feasible strategy for increasing the transplant donor pool in carefully selected recipients.  相似文献   
3.
4.
5.
6.
7.
8.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome.  相似文献   
9.
10.
The availability of new psychoactive substances (NPS) on the recreational drug market continues to create challenges for scientists in the forensic, clinical and toxicology fields. Phenmetrazine (3‐methyl‐2‐phenylmorpholine) and an array of its analogs form a class of psychostimulants that are well documented in the patent and scientific literature. The present study reports on two phenmetrazine analogs that have been encountered on the NPS market following the introduction of 3‐fluorophenmetrazine (3‐FPM), namely 4‐methylphenmetrazine (4‐MPM), and 3‐methylphenmetrazine (3‐MPM). This study describes the syntheses, analytical characterization, and pharmacological evaluation of the positional isomers of MPM. Analytical characterizations employed various chromatographic, spectroscopic, and mass spectrometric platforms. Pharmacological studies were conducted to assess whether MPM isomers might display stimulant‐like effects similar to the parent compound phenmetrazine. The isomers were tested for their ability to inhibit uptake or stimulate release of tritiated substrates at dopamine, norepinephrine and serotonin transporters using in vitro transporter assays in rat brain synaptosomes. The analytical characterization of three vendor samples revealed the presence of 4‐MPM in two of the samples and 3‐MPM in the third sample, which agreed with the product label. The pharmacological findings suggest that 2‐MPM and 3‐MPM will exhibit stimulant properties similar to the parent compound phenmetrazine, whereas 4‐MPM may display entactogen properties more similar to 3,4‐methylenedioxymethamphetamine (MDMA). The combination of test purchases, analytical characterization, targeted organic synthesis, and pharmacological evaluation of NPS and their isomers is an effective approach for the provision of data on these substances as they emerge in the marketplace.  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