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   1514篇
  免费   99篇
  国内免费   1篇
耳鼻咽喉   7篇
儿科学   82篇
妇产科学   12篇
基础医学   275篇
口腔科学   11篇
临床医学   105篇
内科学   294篇
皮肤病学   22篇
神经病学   119篇
特种医学   45篇
外科学   156篇
综合类   107篇
预防医学   146篇
眼科学   18篇
药学   101篇
中国医学   10篇
肿瘤学   104篇
  2023年   13篇
  2022年   41篇
  2021年   67篇
  2020年   24篇
  2019年   29篇
  2018年   37篇
  2017年   32篇
  2016年   27篇
  2015年   37篇
  2014年   52篇
  2013年   67篇
  2012年   129篇
  2011年   97篇
  2010年   63篇
  2009年   49篇
  2008年   66篇
  2007年   76篇
  2006年   94篇
  2005年   91篇
  2004年   75篇
  2003年   63篇
  2002年   63篇
  2001年   40篇
  2000年   33篇
  1999年   37篇
  1998年   21篇
  1997年   13篇
  1996年   15篇
  1995年   7篇
  1994年   11篇
  1993年   8篇
  1992年   20篇
  1991年   9篇
  1990年   10篇
  1989年   10篇
  1988年   7篇
  1987年   8篇
  1986年   6篇
  1985年   8篇
  1984年   10篇
  1983年   11篇
  1981年   7篇
  1976年   2篇
  1975年   5篇
  1974年   3篇
  1972年   3篇
  1971年   2篇
  1969年   5篇
  1966年   1篇
  1965年   2篇
排序方式: 共有1614条查询结果,搜索用时 15 毫秒
991.
Our study objective is to measure the survival impact of insurance status following liver transplantation in a cohort of uninsured “charity care” patients. These patients are analogous to the population who will gain insurance via the Affordable Care Act. We hypothesize there will be reduced survival in charity care compared to other insurance strata. We conducted a retrospective study of 898 liver transplants from 2000 to 2010. Insurance cohorts were classified as private (n = 640), public (n = 233) and charity care (n = 23). The 1, 3 and 5‐year survival was 92%, 88% and 83% in private insurance, 89%, 80% and 73% in public insurance and 83%, 72% and 51% in charity care. Compared to private insurance, multivariable regression analyses demonstrated charity care (HR 3.11, CI 1.41–6.86) and public insurance (HR 1.58, CI 1.06–2.34) had a higher 5‐year mortality hazard ratio. In contrast, other measures of socioeconomic status were not significantly associated with increased mortality. The charity care cohort demonstrated the highest incidence of acute rejection and missed clinic appointments. These data suggest factors other than demographic and socioeconomic may be associated with increased mortality. Further investigations are necessary to determine causative predictors of increased mortality in liver transplant patients without private insurance.  相似文献   
992.
993.
This prospective observational study was done to find out the frequency of various forms of congenital heart disease (CHD) diagnosed by echocardiography. During the study period (January 2002 to December 2005) 2050 patients were screened by echocardiography. All patients were evaluated by cardiologists and had chest radiograph, electrocardiogram and echocardiography. Total 2050 patients were studied and among them 1071 had congenital heart disease. Male was 561(52.38%) and female was 510(47.62%). Atrial septal defect (ASD) was 374(34.92%), ventricular septal defect (VSD) was 318(29.69%), patent ductus arteriosus (PDA) 83(7.75%), pulmonary stenosis (PS) 58(5.42%), tetralogy of Fallot 162(15.13%), transposition of great vessels (TGA) 16(1.49%), Ebstein anomaly 5(0.4%), coarctation of aorta 1(0.09%) and single ventricle 2(0.19%). This distribution is more or less similar to that reported in studies at home and abroad. In this study atrial septal defect (ASD) was the commonest in acyanotic CHD and tetralogy of Fallot was the commonest cyanotic CHD.  相似文献   
994.
The present study has been designed to compare the intensity of postoperative pain in children by wound infiltration with levobupivacaine with that provided by paracetamol administration per rectaly. This intervention study was carried out at the department of paediatric surgery, Mymensingh Medical College Hospital, Mymensingh and Dhaka Medical College Hospital, Dhaka, during the period of January 2009 to September 2010. A total of 120 patients were included in this study. Among them 60 patients in Group A (study group) where post incisional wound infiltration with levobupivacain after inguinal herniotomy before skin closure was done and 60 patients in Group B (control group) where paracetamol was given per rectally after induction of anaesthesia. Both groups were followed up post operatively for 23 hours. The intensity of post operative pain relief following inguinal hernia repair in children by wound infiltration with levobupivacaine is significantly higher than rectal administration of paracetamol.  相似文献   
995.
Understanding molecular mechanisms of tumourigenesis underlies new therapeutic strategies that specifically target tumours. This has led to the evolution of personalised therapy that was first used in breast cancer when hormone receptor status was determined. More recently in colorectal cancer treatment the Epidermal Growth Factor receptor and its tumourigenic role has led to its targeting by using Cetuximab and Panitumumab. Addition of these drugs to existing drug regimes (FOLFOX and FOLFIRI) showed improved respectability rates in patients with liver metastasis. Most recently the Endothelin receptor has been implicated in multiple tumourigenic processes. Interest has grown in using Endothelin A receptor antagonists as adjuvant or combination therapy as suggested by the FOLFERA and FOLFIRI trials currently on-going.  相似文献   
996.
997.
As the prevalence of autism spectrum disorders (ASDs) has increased, attention has shifted toward consideration of ASDs in adolescence and adulthood, as well as public health repercussions for this population. Since the social and emotional deficits within ASDs may be salient during incidents of unintended criminal or violent behavior, one area of focus is involvement of adolescents and young adults with ASD in the criminal justice system. Without a thorough understanding of how and why individuals with ASDs may exhibit criminal behavior, judicial and legislative state systems have begun to develop policies lacking a substantial evidence base. In this article, we attempt to synthesize the literature on one type of ASD (high functioning) and criminal behavior. Three specific deficits characteristic of individuals with ASDs (theory of mind, emotion regulation, and moral reasoning) are examined as potential confluent forces leading to criminal behavior among individuals with ASDs. Legal and policy recommendations are presented.  相似文献   
998.
Femtosecond laser processes were optimized for nonlinear interactions with various optical materials to develop a novel biophotonic lab-on-a-chip device that integrates laser-formed waveguides (WGs), microfluidic channels and photonic crystals (PCs). Such integration seeks the unique demonstration of dual PC functionalities: (1) efficient chromatographic separation and filtration of analytes through a porous PC embedded inside a microfluidic channel and (2) optofluidic spectroscopy through embedded WGs that probe PC stopband shifts as varying analyte concentrations flow and separate. The building blocks together with their integration were demonstrated, providing embedded porous PCs through which electrochromatography drove an accelerated mobile phase of analyte and an optical stopband was probed via integrated buried WGs. Together, these laboratory results underpin the promise of simultaneous chromatographic and spectroscopic capabilities in a single PC optofluidic device.OCIS codes: (130.3120) Integrated optics devices, (140.3390) Laser materials processing, (160.5298) Photonic crystals, (190.4180) Multiphoton processes, (280.4788) Optical sensing and sensors, (280.5715) Refractivity profiles, (320.2250) Femtosecond phenomena  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