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   1902902篇
  免费   135117篇
  国内免费   3957篇
耳鼻咽喉   27462篇
儿科学   59893篇
妇产科学   52718篇
基础医学   278494篇
口腔科学   56036篇
临床医学   165806篇
内科学   366243篇
皮肤病学   43345篇
神经病学   145692篇
特种医学   73860篇
外国民族医学   503篇
外科学   290951篇
综合类   43251篇
现状与发展   8篇
一般理论   583篇
预防医学   135610篇
眼科学   45253篇
药学   144122篇
  7篇
中国医学   4954篇
肿瘤学   107185篇
  2018年   18180篇
  2016年   16136篇
  2015年   17977篇
  2014年   25019篇
  2013年   37893篇
  2012年   49762篇
  2011年   52724篇
  2010年   31284篇
  2009年   30010篇
  2008年   50022篇
  2007年   54354篇
  2006年   55030篇
  2005年   52741篇
  2004年   51398篇
  2003年   49568篇
  2002年   48748篇
  2001年   90312篇
  2000年   92523篇
  1999年   77824篇
  1998年   20997篇
  1997年   18737篇
  1996年   18363篇
  1995年   17396篇
  1994年   16243篇
  1992年   60425篇
  1991年   59184篇
  1990年   58080篇
  1989年   56900篇
  1988年   52653篇
  1987年   51776篇
  1986年   49467篇
  1985年   46968篇
  1984年   34944篇
  1983年   29739篇
  1982年   17478篇
  1981年   15891篇
  1979年   33380篇
  1978年   23833篇
  1977年   20510篇
  1976年   18959篇
  1975年   21503篇
  1974年   25340篇
  1973年   24534篇
  1972年   23335篇
  1971年   21811篇
  1970年   20813篇
  1969年   19764篇
  1968年   18428篇
  1967年   16537篇
  1966年   15233篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
131.
Neuroscience and Behavioral Physiology - Objective. To determine the frequency, structure, and severity of cognitive impairments in patients with bipolar affective disorder (BAD) in remission....  相似文献   
132.
133.
134.
Accurate diagnosis and recognition of predisposing factors has been shown to be challenging in lower limb cellulitis (LLC). Assessment of 1746 consecutive patients with cellulitis presenting to a UK university hospital showed increasing overdiagnosis, with only 31.9% of patients referred during the period 2015–2018 having the diagnosis of LLC confirmed. Recognition of at least one predisposing factor increased from 61% to 89% following introduction of more specific screening questions. This identified a need for better primary care dermatology education and the benefit of a proforma with specific screening questions for reversible predisposing factors for LLC.  相似文献   
135.
Background: Egyptian street youth use substances including tobacco, illicit drugs, and pharmaceutical drugs. To understand the circumstances, including adverse childhood experiences, that place adolescents at risk for engaging in substance use, we conducted in-depth interviews among a sample of Egyptian street children. Methods: From youth residing at or attending Caritas, a non-profit organization, which provides shelter and education to street youth, seven girls and twelve boys, aged 12–18 years, participated in open-ended, in-depth interviews. Results: Eight out of the 19 participants reported family history (early exposure) to substance use; and seven of them were initiated by either a family member (sibling), friend or coworker. Most of the participants reported a history of conflict with or abuse (verbal or physical) by their parents or siblings, or stressful situations at home; they used substance(s) to alleviate their stress. Few attended school, and some were forced to work and help their family. Conclusions: Among Egyptian youth, adverse childhood experiences, such as poverty, child abuse, and family substance use, challenge somewhat susceptible youths and lead them to the path of substance use and addiction. Prevention intervention should be multifaceted, culturally adaptable, and primarily targeting the social environment during childhood.  相似文献   
136.
137.
138.
Donor site morbidity following radial forearm flap (RFF) harvest remains a controversial issue. The aim of this meta-analysis was to answer the question “Are the range of wrist movements (range of motion, ROM) and hand strength affected after RFF harvesting?” The PubMed, Embase, Scopus, and Cochrane Library electronic databases were systematically searched (to December 2019). Self-controlled studies evaluating hand biomechanics after RFF harvest were included. Weighted mean differences with 95% confidence intervals were calculated using the random-effects model. The outcome variables were ROM, forearm movements, grip, and pinch strengths. Thirteen studies involving a total of 335 patients were included. With the exception of grip strength and supination, which showed statistically significant reductions of about 2.40 kg and 2.86° (P < 0.05), all other ROM, forearm movements, and pinch strengths showed an insignificant difference when the operated hand was compared to the non-operated hand (P > 0.05). Regression analysis showed that the method of donor site closure and size of the donor site defect had an insignificant impact on hand biomechanics. This study confirms the lack of discernible biomechanical morbidity after RFF transfer. The minimal reduction in hand biomechanics after RFF is considered to be clinically negligible.  相似文献   
139.
140.
In both adults and children with diabetes, technologies such as continuous subcutaneous insulin infusion using insulin pumps and continuous glucose monitoring can help improve diabetes control, reduce hypoglycaemia and improve quality of life. Access to these technologies in the UK is very variable. Some technologies are recommended by the National Institute for Health and Care Excellence, while others have not been appraised, and new technologies are emerging all the time. Additionally, different guidelines for adults and children further complicate access to diabetes technology in the transition from paediatric to adult care. Against this background, Diabetes UK and NHS England have brought together a multidisciplinary group of experts, including clinicians and people with diabetes, to develop this consensus guideline, combining the different technologies into a common pathway to aid clinical and policy decision‐making. We created a pathway that supports the incremental addition of technology as monotherapy and then dual therapy in the same way that we incrementally add in therapeutic agents to support people with Type 2 diabetes to achieve their personalized glycaemic targets. The pathway emphasizes the importance of structured education, specialist support and appropriate access to psychological therapies, as essential pillars for optimized use of diabetes‐related technology, and recommends the re‐evaluation of its use when the individual is unable either to use the technology appropriately or to achieve the intended outcomes. This pathway is endorsed by UK‐wide clinical and patient associations and we recommend that providers and commissioners use it to ensure the right individual with diabetes has access to the right technology in a timely way to help achieve better outcomes.  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