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   1844篇
  免费   154篇
  国内免费   5篇
耳鼻咽喉   10篇
儿科学   72篇
妇产科学   41篇
基础医学   187篇
口腔科学   62篇
临床医学   185篇
内科学   348篇
皮肤病学   39篇
神经病学   153篇
特种医学   115篇
外国民族医学   1篇
外科学   189篇
综合类   52篇
预防医学   193篇
眼科学   64篇
药学   125篇
  1篇
中国医学   20篇
肿瘤学   146篇
  2023年   22篇
  2022年   19篇
  2021年   46篇
  2020年   31篇
  2019年   38篇
  2018年   28篇
  2017年   27篇
  2016年   42篇
  2015年   51篇
  2014年   68篇
  2013年   102篇
  2012年   92篇
  2011年   78篇
  2010年   64篇
  2009年   47篇
  2008年   57篇
  2007年   70篇
  2006年   56篇
  2005年   59篇
  2004年   48篇
  2003年   51篇
  2002年   29篇
  2001年   31篇
  2000年   35篇
  1999年   34篇
  1998年   36篇
  1997年   31篇
  1996年   39篇
  1995年   25篇
  1994年   27篇
  1993年   22篇
  1992年   27篇
  1991年   21篇
  1990年   34篇
  1989年   37篇
  1988年   42篇
  1987年   27篇
  1986年   32篇
  1985年   49篇
  1984年   32篇
  1983年   21篇
  1982年   16篇
  1980年   17篇
  1979年   26篇
  1978年   19篇
  1977年   16篇
  1976年   19篇
  1973年   17篇
  1972年   15篇
  1969年   20篇
排序方式: 共有2003条查询结果,搜索用时 15 毫秒
1.
In 1984, 154 physicians who had completed residencies in internal medicine at 15 major teaching hospitals in 1982 evaluated their residency training in ambulatory care. A majority of the physicians would have liked more experience in practical areas related to career planning and office management, more input from subspecialties such as orthopedics and dermatology, greater knowledge about the management of psychosocial problems, and more information about exercise and nutrition. Although many physicians also wanted more time devoted to several other topics, less than 20 percent recommended spending less time on 26 of the 27 topics being evaluated. Since these recommendations are similar to those reported in evaluation studies published over the past 25 years, it appears that training programs in internal medicine have not been successful in restructuring their curricula to meet many of the needs of practicing physicians.  相似文献   
2.
Conflicting published data regarding the role of macrophages and other cell types during the early stages of diabetes mellitus led us to further study this problem. To this end we diabetized mice, using low doses of streptozocin (STZ), 40 mg/kg body wt/day/5 days, and processed their pancreatic tissue for immunocytochemistry and ultrastructural observations; immunohistochemistry was performed on days 5 and 18 after the first STZ injection, and islets were observed ultrastructurally on days 5, 9, 10, and 18. Animals were tested for fasting serum glucose, and isolated islets were assayed for insulin secretion capacity. Immunohistology demonstrated that expression of major histocompatability complex class 2 antigens is strongly induced by multiple, low dose STZ treatments prior to impaired insulin release, and that different types of cells within the islet are capable of expressing Ia molecules. Ultrastructurally we found (a) a small number of macrophages (most probably resident monocytes/macrophages) containing B-cell debris, that were located close to either damaged or intact B cells; (b) a large number of recruited macrophages in a vascular or perivascular position; and (c) macrophages recognizable in the exocrine portion, close to the islets, occasionally containing exocrine cell debris. This led us to believe that recruited macrophages play an important role in the early islet-infiltrating stage.  相似文献   
3.
4.
A case of uncommon paratesticular mesothelioma in a young patient is presented. Its questionable malignancy, as well as the method of treatment are discussed.  相似文献   
5.
The present paper is focused on the relationship between psychological variables and health beliefs in 93 diabetic men. A Diabetes Health Belief Scale was used to assess general health motivation, treatment beneficial, severity, susceptibility, psychological barriers, cues to action, and structural elements. The psychological variables included two measures of locus of control, depression, somatization, interpersonal sensitivity, obsessive—compulsiveness, anxiety, self-esteem, and attitudes toward diabetes, doctor, and medical care. Ten of the 11 psychological variables were correlated with various aspects of health beliefs. This indicates the extent to which the health beliefs are enmeshed with the psychological dynamics of the person. It would seem important to take such a psychological profile into consideration when attempting to understand and even alter the health beliefs.  相似文献   
6.
Prevention of shoulder subluxation after stroke with electrical stimulation   总被引:5,自引:0,他引:5  
BACKGROUND AND PURPOSE: Subluxation is a significant problem in poststroke hemiplegia, resulting in pain and loss of function. Current treatments are not proved and not considered effective. It has been demonstrated that cyclical electrical stimulation of the shoulder muscles can reduce existing subluxation. The purpose of this study was to determine whether electrical stimulation could prevent subluxation in both the short and long terms. METHODS: A prospective, randomized controlled study was used to determine the efficacy of electrical stimulation in preventing shoulder subluxation in patients after cerebrovascular accidents. Forty patients were selected and randomly assigned to a control or treatment group. They had their first assessment within 48 hours of their stroke, and those in the treatment group were immediately put on a regimen of electrical stimulation for 4 weeks. All patients were assessed at 4 weeks after stroke and then again at 12 weeks after stroke. Assessments were made of shoulder subluxation, pain, and motor control. RESULTS: The treatment group had significantly less subluxation and pain after the treatment period, but at the end of the follow-up period there were no significant differences between the 2 groups. CONCLUSIONS: Electrical stimulation can prevent shoulder subluxation, but this effect was not maintained after the withdrawal of treatment.  相似文献   
7.
8.
9.
Lester DK  Linn LS 《Orthopedics》2000,23(2):137-140
Total joint arthroplasty is a common procedure for which consistent, clinically satisfactory outcomes are expected. Data from 796 total joint procedures performed by 20 surgeons at one center were evaluated to identify sources of variability in costs (as measured by hospital charges) where clinical outcome is expected to remain constant. Stepwise multivariate regression characterized the contribution of six variables to hospital charges listed in order of explanatory power: postoperative length of stay, surgical time, patient preoperative morbidity, units of blood transfused, perioperative complications, and procedure type (hip or knee) accounted for 46% of variability in hospital charges (multiple R2). In a subsequent analysis, after statistical adjustment for preoperative comorbid diagnoses, the sampling distribution of mean values for surgical time, total units of blood transfused, and total hospital charges were summarized and compared among surgeons. Despite adjustment for comorbid diagnoses, substantial variation and significant differences remained between surgeons in markers of resource utilization and "surgical efficiency." These findings suggest there is substantial variability in hospital charges not attributable to patient characteristics or category of procedure--a distinct and economically significant portion of this variability is practitioner specific.  相似文献   
10.
BackgroundRisk-adjusted cancer screening and prevention is a promising and continuously emerging option for improving cancer prevention. It is driven by increasing knowledge of risk factors and the ability to determine them for individual risk prediction. However, there is a knowledge gap between evidence of increased risk and evidence of the effectiveness and efficiency of clinical preventive interventions based on increased risk. This gap is, in particular, aggravated by the extensive availability of genetic risk factor diagnostics, since the question of appropriate preventive measures immediately arises when an increased risk is identified. However, collecting proof of effective preventive measures, ideally by prospective randomized preventive studies, typically requires very long periods of time, while the knowledge about an increased risk immediately creates a high demand for action.SummaryTherefore, we propose a risk-adjusted prevention concept that is based on the best current evidence making needed and appropriate preventive measures available, and which is constantly evaluated through outcome evaluation, and continuously improved based on these results. We further discuss the structural and procedural requirements as well as legal and socioeconomical aspects relevant for the implementation of this concept.  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