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   199607篇
  免费   35636篇
  国内免费   2641篇
耳鼻咽喉   5639篇
儿科学   7191篇
妇产科学   3709篇
基础医学   10856篇
口腔科学   2238篇
临床医学   31379篇
内科学   58390篇
皮肤病学   8457篇
神经病学   20235篇
特种医学   7392篇
外科学   44827篇
综合类   524篇
现状与发展   73篇
一般理论   43篇
预防医学   11809篇
眼科学   4151篇
药学   4885篇
中国医学   142篇
肿瘤学   15944篇
  2024年   568篇
  2023年   5294篇
  2022年   2517篇
  2021年   5373篇
  2020年   7267篇
  2019年   3859篇
  2018年   9177篇
  2017年   8766篇
  2016年   9983篇
  2015年   10135篇
  2014年   17717篇
  2013年   18467篇
  2012年   9843篇
  2011年   9823篇
  2010年   12565篇
  2009年   16103篇
  2008年   9052篇
  2007年   7296篇
  2006年   9436篇
  2005年   6444篇
  2004年   5521篇
  2003年   4223篇
  2002年   4087篇
  2001年   4000篇
  2000年   3162篇
  1999年   3429篇
  1998年   3947篇
  1997年   3722篇
  1996年   3536篇
  1995年   3374篇
  1994年   2107篇
  1993年   1695篇
  1992年   1463篇
  1991年   1483篇
  1990年   1115篇
  1989年   1247篇
  1988年   1080篇
  1987年   910篇
  1986年   939篇
  1985年   770篇
  1984年   629篇
  1983年   585篇
  1982年   590篇
  1981年   462篇
  1980年   420篇
  1979年   338篇
  1978年   359篇
  1977年   431篇
  1975年   297篇
  1972年   315篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
21.
22.
23.
24.
25.
26.
27.
Abstract

Supporting patients in making informed healthcare decisions is a cornerstone of ethical medical practice. Surgeons frequently draw for and show images to patients when consenting them for operations but the value of this practice in informed decision-making is unclear. An audit was conducted in a General Surgery Department. 244 patients completed questionnaires on the value of visual materials when giving consent for surgery. The complexity of the operations was classified into “simple”, “moderate” or “complex”. 100% of patients felt they had given informed consent to surgery. 62% of patients received at least one form of visual material during the consenting process. All patients who received a drawing, and 99% of those provided with other images, valued these resources. Visual materials were considered more useful to patients when giving consent for moderate or complex operations than simple ones. Approximately one third of patients who did not receive visual materials would have appreciated these when making an informed decision. This research highlights the value of surgeons drawing for, and providing other visual resources to, their patients as part of the consent process. There is a role for further research and training materials in drawing skills for surgeons.  相似文献   
28.
Background: Extracellular matrix molecular components, previously linked to multisystem syndromes include collagens, fibrillins and laminins. Recently, we described a novel multisystem syndrome caused by the c.9418G>A p.(V3140M) mutation in the laminin alpha-5 (LAMA5) gene, which affects connective tissues of all organs and apparatus in a three generation family. In the same family, we have also reported a myopic trait, which, however, was linked to the Prolyl 4-hydroxylase subunit alpha-2 (P4HA2) gene. Results of investigation on vitreous changes and their pathogenesis are reported in the present study.Materials and Methods: Nineteen family individuals underwent complete ophthalmic examination including best-corrected visual acuity (BCVA), fundus examination, fundus photography, intraocular pressure measurement, axial length measurement using ocular biometry, Goldmann visual field examination, standard electroretinogram, SD-OCT. Segregation analysis of LAMA5 and P4HA2 mutations was performed in enrolled members.Results: The vitreous alterations fully segregated with LAMA5 mutation in both young and adult family members. Slight reduction of retinal thickness and peripheral retinal degeneration in only two patients were reported.Conclusions: In this work we showed that PVD is a common trait of LAMA5 multisystem syndrome, therefore occurring as an age-unrelated trait. We hypothesize that the p.(V3140M) mutation results in a reduction of retinal inner limiting membrane (ILM) stability, leading to a derangement in the macromolecular structure of the vitreous gel, and PVD. Further investigations will be necessary to elucidate the role of wild type and mutated LAMA5 in the pathogenesis of PVD.  相似文献   
29.
30.

Rates of mental illness have increased dramatically over the past 15 years in the United States [Products—Data Briefs—Number 283—August 2017. Centers for Disease Control and Prevention. https://www.cdc.gov/nchs/products/databriefs/db283.htm. Published August 15, 2017]. Additionally, life expectancy has fallen over the past several years due to increases in death from suicide, opioid overdose, and alcoholic liver cirrhosis as reported by Case and Deaton [Deaths of despair and the future of capitalism. Princeton University Press, 2020]. Over the last decade some have questioned whether these changes are due to neoliberal capitalist policies and ideologies. Neoliberal capitalism incorporates theories of eliminating all restrictions on the market and decreasing government assistance programs as reported by Harvey [A brief history of neoliberalism, Oxford University Press, 2005]. Since then these policies have led to income inequality, disempowerment of workers, outsourcing of manufacturing jobs, inadequate social services, mass incarceration and an expensive and ineffective healthcare system as reported by Case and Deaton [Deaths of despair and the future of capitalism. Princeton University Press, 2020] and Nkansah-Amankra et al. [International Journal of Health Services 43(2):217-240, 2013]. Studies have shown that the consequences of these policies and ideologies likely have a role in increasing rates of mental illness. This paper will discuss how these factors increase mental distress and postulate ways that mental health professionals can advocate for change.

  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