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   1181篇
  免费   63篇
  国内免费   10篇
耳鼻咽喉   10篇
儿科学   36篇
妇产科学   29篇
基础医学   122篇
口腔科学   26篇
临床医学   152篇
内科学   249篇
皮肤病学   17篇
神经病学   97篇
特种医学   75篇
外科学   176篇
综合类   26篇
预防医学   114篇
眼科学   10篇
药学   76篇
中国医学   6篇
肿瘤学   33篇
  2022年   7篇
  2021年   10篇
  2019年   12篇
  2018年   15篇
  2017年   10篇
  2016年   15篇
  2015年   18篇
  2014年   27篇
  2013年   48篇
  2012年   40篇
  2011年   53篇
  2010年   53篇
  2009年   46篇
  2008年   47篇
  2007年   48篇
  2006年   47篇
  2005年   54篇
  2004年   50篇
  2003年   42篇
  2002年   27篇
  2001年   39篇
  2000年   36篇
  1999年   36篇
  1998年   19篇
  1997年   28篇
  1996年   19篇
  1995年   18篇
  1994年   32篇
  1993年   21篇
  1992年   23篇
  1991年   31篇
  1990年   31篇
  1989年   15篇
  1988年   20篇
  1987年   26篇
  1986年   17篇
  1985年   10篇
  1984年   7篇
  1983年   7篇
  1982年   10篇
  1980年   7篇
  1978年   7篇
  1977年   5篇
  1974年   6篇
  1967年   5篇
  1958年   14篇
  1957年   13篇
  1956年   10篇
  1955年   12篇
  1954年   15篇
排序方式: 共有1254条查询结果,搜索用时 31 毫秒
101.
Healthcare is increasingly multicultural, posing a challenge for nurse educators in both Europe and the United States. Nursing education faculties are responding to the challenge of internationalization, for instance, by participating in international student exchange projects to foster students' intercultural competence. The authors describe an educational model constructed during a transatlantic project between European and American universities. The benefits of the project from the Finnish partner's perspective are also reported.  相似文献   
102.
103.
Quality of Life Research - The impact of visual acuity (VA) on Health-Related Quality of Life (HRQoL) and the cross-sectional and longitudinal differences in HRQoL during the 11-year follow-up were...  相似文献   
104.
Competent educators are needed to ensure that social and healthcare professionals are effective and highly competent. However, there is too little evidence‐based knowledge of current and required enhancements of educators' competences in this field. The aim of this study was to describe social and healthcare educators’ perceptions of their competence in education. The study had a qualitative design, based on interviews with educators and rooted in critical realism. Forty‐eight participants were recruited from seven universities of applied sciences and two vocational colleges in Finland, with the assistance of contact persons nominated by the institutions. The inclusion criterion for participation was employment by an educational institution as a part‐time or full‐time, social and/or healthcare educator. Data were collected in the period February–April 2018. The participants were interviewed in 16 focus groups with two to five participants per group. The acquired data were subjected to inductive content analysis, which yielded 506 open codes, 48 sub‐categories, nine categories and one main category. The educators’ competence was defined as a multidimensional construct, including categories of educators’ competences in practicing as an educator, subject, ethics, pedagogy, management and organisation, innovation and development, collaboration, handling cultural and linguistic diversity, and continuous professional development. Educators recognised the need for developing competence in innovation to meet rapid changes in a competitive and increasingly global sociopolitical environment. Enhancement of adaptability to rapid changes was recognised as a necessity. The findings have social value in identifying requirements to improve social and healthcare educators' competence by helping educational leadership to improve educational standards, construct a continuous education framework and create national and/or international curricula for teacher education degree programs to enhance the quality of education. We also suggest that educational leadership needs to establish, maintain and strengthen collaborative strategies to provide effective, adaptable support systems, involving educators and students, in their working practices.  相似文献   
105.
Transplant coronary artery disease (TxCAD) as a manifestation of chronic rejection is a major limitation to long-term survival of heart transplant recipients. Although the exact molecular and cellular mechanisms contributing to neointimal formation are unknown, it has been generally believed that smooth muscle cells (SMC) of donor origin migrate from the media into the subendothelial layer of the vascular wall, where SMC proliferate and synthesize extracellular matrix resulting in intimal thickening. However, recent observations indicate that hematopoietic and vascular progenitor cells derived from recipient bone marrow may contribute to the arteriosclerotic lesion formation in the coronary arteries of the transplant. On the other hand, studies on postnatal hematopoiesis indicate that angiogenic growth factors such as vascular endothelial growth factor (VEGF) and angiopoietin-1 (Ang1) may regulate the recruitment of these cells into distant organs. Furthermore, embryonic VEGFR-2 /CD34+ stem cells may serve as vascular progenitor cells and their differentiation into endothelial cells and SMC may be regulated by VEGF and platelet-derived growth factor (PDGF), respectively. In this review, we discuss the role of angiogenic growth factors such as VEGF, Ang, and PDGF in the recruitment of hematopoietic and vascular progenitor cells in TxCAD and suggest novel therapies targeted at homing, differentiation and proliferation of these cells in the allograft.  相似文献   
106.
Gender Differences in Patients With AVNRT. Introduction: The detailed electrophysiological characteristics of the gender differences associated with atrioventricular nodal reentrant tachycardia (AVNRT) have not been clarified. This study investigated the gender‐related electrophysiological differences in a large series of patients undergoing radiofrequency catheter ablation. Methods and Results: A total of 2,088 consecutive AVNRT patients (men/women 869/1,219) who underwent catheter ablation were enrolled in this study. We evaluated the gender differences in their electrophysiological characteristics. Women had a significantly younger age of onset, higher incidence of multiple jumps, shorter AH interval, atrial effective refractory period (ERP), anterograde fast pathway ERP, anterograde slow pathway ERP, and retrograde slow pathway ERP, and longer ventricular ERP than men. The incidence of baseline ventriculoatrial dissociation was lower in women than in men. Women needed less isoproterenol/atropine to induce AVNRT. No gender differences in the radiation exposure time, procedure time, complication rate, acute success rate, or second procedure rate were noted. Both typical and atypical AVNRT were more predominant in women. In the patients with atypical AVNRT, there was no significant gender difference in incidence of baseline ventriculoatrial dissociation; however, the retrograde slow pathway ERP was significantly shorter in women than in men. Women of premenopausal age (≤50 years old) had a significantly higher incidence of anterograde multiple jumps and a retrograde jump phenomenon, and a shorter anterograde slow pathway ERP and retrograde slow pathway ERP than those of women over 50 years old. Conclusion: Gender differences in the anterograde and retrograde AV nodal electrophysiology were noted in the patients with AVNRT. (J Cardiovasc Electrophysiol, Vol. 21, pp. 1114‐1119)  相似文献   
107.
Unipolar Characteristics of CFAEs. Background: The noncontact mapping (NCM) system possesses the merit of global endocardial recording for unipolar and activation mapping. Objective: We aimed to evaluate the unipolar electrogram characteristics and activation pattern over the bipolar complex fractionated atrial electrogram (CFAE) sites during atrial fibrillation (AF). Methods: Twenty patients (age 55 ± 11 years old, 15 males) who underwent NCM and ablation of AF (paroxysmal/persistent = 13/7) were included. Both contact bipolar (32–300 Hz) and NCM virtual unipolar electrograms (0.5–300 Hz) were simultaneously recorded along with the activation pattern (total 223 sites, 11 ± 4 sites/patient). A CFAE was defined as a mean bipolar cycle length of ≤ 120 ms with an intervening isoelectric interval of more than 50 ms (Group 1A, n = 63, rapid repetitive CFAEs) or continuous fractionated activity (Group 1B, n = 59, continuous fractionated CFAEs), measured over a 7.2‐second duration. Group 2 consisted of those with a bipolar cycle length of more than 120 ms (n = 101). Results: The Group 1A CFAE sites exhibited a shorter unipolar electrogram cycle length (129 ± 11 vs 164 ± 20 ms, P < 0.001), and higher percentage of an S‐wave predominant pattern (QS or rS wave, 63 ± 13% vs 35 ± 13%, P < 0.001) than the Group 2 non‐CFAE sites. There was a linear correlation between the bipolar and unipolar cycle lengths (P < 0.001, R = 0.87). Most of the Group 1A CFAEs were located over arrhythmogenic pulmonary vein ostia or nonpulmonary vein ectopy with repetitive activations from those ectopies (62%) or the pivot points of the turning wavefronts (21%), whereas the Group 1B CFAEs exhibited a passive activation (44%) or slow conduction (31%). Conclusions: The bipolar repetitive and continuous fractionated CFAEs represented different activation patterns. The former was associated with an S wave predominant unipolar morphology which may represent an important focus for maintaining AF. (J Cardiovasc Electrophysiol, Vol. 21, pp. 640‐648, June 2010)  相似文献   
108.
The impact of post‐transplant diabetes (PTDM) on kidney transplant histopathology has been poorly described. We examined the association of glucose metabolism abnormalities on the progression of histopathological changes in serial protocol biopsies. Helsinki University Hospital kidney transplant recipients during 2004–2006 were followed up. Patients with pre‐existing diabetes or 2‐h oral glucose tolerance test (OGTT) performed at 3 months, and protocol biopsies taken at 0 and 12 months were analyzed (n = 76). Diabetes was defined according to WHO/ADA. Histology was analyzed with chronic allograft damage index (CADI). Altogether 32 patients had pre‐existing diabetes. In OGTT at 3 months, four showed PTDM, eight impaired glucose tolerance (IGT), two impaired fasting glucose, and 30 normal glucose tolerance. Patients with impaired glucose metabolism were older (P = 0.005), received grafts from older donors (P = 0.04), and had reduced renal function at 12 months (P = 0.003). In patients with IGT or PTDM, 2‐h postload glucose values in OGTT correlated with CADI at 12 months (R = 0.84, P = 0.001) and with the change in CADI score between 0 and 12 months (R = 0.67, P = 0.025). Graft survival was reduced in patients with pre‐existing diabetes (P = 0.01). Glucose abnormalities were associated with the progression of histopathological changes, especially in patients with already compromised kidneys, supporting the harmful role of PTDM to the kidney allograft.  相似文献   
109.
传统中国医疗伦理对当代美德医疗伦理学可作的贡献   总被引:3,自引:3,他引:0  
晚近20年,英语世界道德哲学的最重大发展是美德伦理学的复兴。除了新亚里士多德学派,还有休谟学派、尼采学派及基督教学派等。同样的复兴也在医疗伦理学中发生。影响世界的Beauchamp与Childress的《生命医疗伦理学原则》,也在最新版本(第6版,2009年)中不再批评美德伦理学,而且承认其优点。从此书的第三版开始分析,看书的作者如何在以后三次修订版中,修改自己对美德伦理学的立场。与现代西方不同,古代中国医疗伦理的著述,是规则导向与关德导向并重,这肯定受了儒家文化的影响。儒家伦理学一直是美德导向,今天西方美德伦理学也要向孔孟取经。礼失求诸野,今天西方的医疗伦理学都强调美德的重要性,中国的医疗伦理学难道还只停留在讨论四个道德原则的运用吗?再者,我们要提出切合这个时代需要的修养工夫,这样不单是对当代中国医疗伦理的建设,也是对世界性美德医疗伦理学的贡献。  相似文献   
110.
目的:探讨英国药学教育制度对我国药学教育发展的启示。方法:分析英国药学教育制度的成功之处及其缺点,提出对我国药学教育未来发展的建议。结果与结论:英国药学教育以培训药学硕士为主,其教学内容需遵从英国药物政务局的全国统一指示性药学教学大纲,教学及考试方式以案例教学法和临床能力测验为主,有效地规范了全国的药学教育,使课程的质量和学生能力达到较高水平。这些制度对我国药学教育有正面的参考价值,也有实施的可能性。  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