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   821篇
  免费   32篇
  国内免费   1篇
耳鼻咽喉   3篇
儿科学   32篇
妇产科学   86篇
基础医学   83篇
口腔科学   8篇
临床医学   81篇
内科学   183篇
皮肤病学   14篇
神经病学   122篇
特种医学   14篇
外科学   103篇
综合类   10篇
一般理论   6篇
预防医学   56篇
眼科学   20篇
药学   17篇
中国医学   3篇
肿瘤学   13篇
  2022年   8篇
  2021年   10篇
  2020年   10篇
  2019年   17篇
  2018年   14篇
  2017年   11篇
  2016年   15篇
  2015年   13篇
  2014年   21篇
  2013年   44篇
  2012年   38篇
  2011年   41篇
  2010年   26篇
  2009年   19篇
  2008年   49篇
  2007年   33篇
  2006年   27篇
  2005年   37篇
  2004年   26篇
  2003年   20篇
  2002年   21篇
  2001年   21篇
  2000年   17篇
  1999年   20篇
  1997年   7篇
  1996年   9篇
  1995年   8篇
  1994年   6篇
  1993年   6篇
  1992年   11篇
  1991年   25篇
  1990年   29篇
  1989年   11篇
  1988年   13篇
  1987年   22篇
  1986年   14篇
  1985年   10篇
  1984年   9篇
  1983年   10篇
  1982年   14篇
  1981年   9篇
  1979年   6篇
  1978年   5篇
  1977年   7篇
  1974年   5篇
  1973年   11篇
  1971年   6篇
  1969年   5篇
  1967年   7篇
  1965年   6篇
排序方式: 共有854条查询结果,搜索用时 31 毫秒
31.
Background and aimsBody mass index (BMI) and waist circumference (WC) are commonly used markers of cardiometabolic risk. However, sagittal abdominal diameter (SAD) has been proposed as a possibly more sensitive marker of intra-abdominal obesity. We investigated differences in how SAD, WC, and BMI were correlated with cardiometabolic risk markers.Methods and resultsThis cross-sectional study investigated anthropometric and metabolic baseline measurements of individuals from six trials. Multiple linear regression and (partial) correlation coefficients were used to investigate associations between SAD, WC, and BMI and cardiometabolic risk markers, including components of the metabolic syndrome as well as insulin resistance, blood lipids, and lowgrade inflammation.In total 1516 mostly overweight or obese individuals were included in the study. SAD was significantly more correlated with TG than WC for all studies, and overall increase in correlation was 0.05 (95% CI (0.02; 0.08). SAD was significantly more correlated with the markers TG and DBP 0.11 (95% CI (0.08, 0.14)) and 0.04 (95% CI (0.006, 0.07), respectively compared to BMI across all or most studies.ConclusionThis study showed that no single anthropometric indicator was consistently more strongly correlated across all markers of cardiometabolic risk. However, SAD was significantly more strongly correlated with TG than WC and significantly more strongly correlated with DBP and TG than BMI.  相似文献   
32.
Owing to its geometry, the observed viscosity obtained with a Wells-Brook-field Micro Viscometer (LVT Cone/Plate, 1.565°) depends on sub-specimen volume. For each apparatus a compromise volume should be found, preferably giving both correct nominal values for Newtonian reference liquids and minimal variation with volume. Besides oil comparison liquids, the use of a water-ethanol comparison liquid is recommended for hemorheological measurements.  相似文献   
33.

Background  

During spring-assisted cranioplasty, the spring transmits forces through adjacent cranium. We have previously demonstrated that the ectocranial–endocranial thickness of cranial sutures increases significantly over time in the presence of continuous spring forces. We wished to investigate if cranial bone showed similar adaptational responses.  相似文献   
34.
With refinement of vitrectomy techniques over the past 30 years, the treatment of rhegmatogenous retinal detachment (RRD) has transitioned from the almost exclusive use of extraocular techniques to the present time in which intraocular interventions are available and, in some practices, enjoy almost exclusive use for primary repair of RRD. Except for those situations in which a retinal detachment is associated with obvious immediate complications related to the cataract surgery, the considerations for the treatment of pseudophakic RRD are quite similar to those of phakic RRD. The current options are: use of an extraocular buckling device, vitrectomy-related procedures, intraocular gas injection with associated retinopexy, and combinations of these. Disagreement on the ideal intervention for pseudophakic retinal detachment is not uncommon and particularly so in those RRDs which lie somewhere in the spectrum between complex and simple. As is so often the case in the surgical treatment of disease, there may not be one ideal technique for a particular type of RRD; but knowledge of alternatives logically increases the likelihood of a successful result. The goal of this paper is to outline the clinical factors shown to be of importance in deciding which technique will have the greatest chance at not only achieving retinal re-attachment but also in optimizing long-term vision.  相似文献   
35.
36.
Preconditioning with sublethal ischemia protects against neuronal damage after subsequent lethal ischemic insults in hippocampal neurons. A pharmacological approach using agonists and antagonists at the adenosine A1 receptor as well as openers and blockers of ATP-sensitive K+ channels has been combined with an analysis of neuronal death and gene expression of subunits of glutamate and gamma-aminobutyric acid receptors, HSP70, c-fos, c-jun, and growth factors. It indicates that the mechanism of ischemic tolerance involves a cascade of events including liberation of adenosine, stimulation of adenosine A1 receptors, and, via these receptors, opening of sulfonylurea-sensitive ATP-sensitive K+ channels.  相似文献   
37.
If stem cell research led to therapies that changed the natural contours of human life, it would unsettle our ethical commitments, including the very notion of a human right, and encourage us to see the entire natural world, the human body along with it, as having the status only of material to be manipulated.  相似文献   
38.
Completion of treatment is an important predictor of favourable outcome. We need more knowledge about predictors of completion in the inpatient psychosocial treatment modality. This prospective study from 13 such programmes follows a consecutive sample of clients (n = 307) from admission to completion/dropout. Instruments: EuropASI, MCMI II, SCL-25. The mean completion rate was 40% (20-71%), with no difference between clients with no ('debutants') or previous ('veterans') inpatient stays. Among 'debutants', the number of years of heroin use was negatively related to completion. Among 'veterans', age and amphetamine use were positively related, while the presence of a personality disorder and number of previous inpatient treatments were negatively related to completion. Specific strategies for involving clients with personality disorders are needed. After three inpatient stays, other types of treatment should be offered.  相似文献   
39.
Fish oil addition to infant formulas has raised concern on whether increased intake of n-3 long-chain polyunsaturated fatty acid (n-3LCPUFA) affects infant growth. The objective of this study was to determine whether maternal fish oil supplementation during 0-4 mo of lactation influences growth in infancy and early childhood. In a randomized, blinded intervention trial, lactating Danish mothers with a fish intake below the population median were randomized to 4.5 g/d fish oil or olive oil. A reference group of 53 mothers with a fish intake in the highest quartile of the population and their infants were included in the study. Head circumference, weight, length, skinfold thickness, and waist circumference of children were measured at 2, 4, and 9 mo and at 2.5 y. One hundred children completed the intervention trial, and 72 were followed up at 2.5 y together with 29 from the reference group. Growth in weight, length, and head circumference did not differ between the randomized groups up to 9 mo, but at 2.5 y, body composition differed significantly. Children in the fish oil group had larger waist circumference body mass index (BMI; 0.6 kg/m(2); p = 0.022), and head circumference compared with those in the olive oil group. Adjusted for sex, ponderal index at birth and current energy intake, BMI at 2.5 y was associated with docosahexaenoic acid in maternal erythrocytes after the intervention. In conclusion, the n-3LCPUFA intake of lactating mothers may be important for growth of young children. The long-term effect on weight and BMI remains to be investigated.  相似文献   
40.
We examined untreated 60 patients with acute monosymptomatic optic neuritis (ON). Patients examined early after onset showed increased expression of HLA-DR and CD45R0 on CD4 and CD8 T cells. Expression of HLA-DR on CD4 T cells was higher in patients without IgG oligoclonal bands. Expression of HLA-DR on CD4 and CD8 T cells correlated negatively with measures of disease activity and positively with measures of good visual function, and expression of CD45R0 on CD4 T cells correlated negatively with measures of disease activity. We hypothesize that HLA-DR expression may characterize a protective T-cell subset in ON.  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