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   1771篇
  免费   121篇
  国内免费   15篇
耳鼻咽喉   3篇
儿科学   91篇
妇产科学   10篇
基础医学   372篇
口腔科学   11篇
临床医学   233篇
内科学   137篇
神经病学   362篇
特种医学   85篇
外科学   58篇
综合类   111篇
预防医学   221篇
眼科学   27篇
药学   112篇
  1篇
中国医学   43篇
肿瘤学   30篇
  2024年   3篇
  2023年   27篇
  2022年   58篇
  2021年   72篇
  2020年   73篇
  2019年   81篇
  2018年   59篇
  2017年   67篇
  2016年   59篇
  2015年   75篇
  2014年   109篇
  2013年   141篇
  2012年   78篇
  2011年   129篇
  2010年   78篇
  2009年   88篇
  2008年   88篇
  2007年   70篇
  2006年   70篇
  2005年   52篇
  2004年   40篇
  2003年   44篇
  2002年   38篇
  2001年   40篇
  2000年   21篇
  1999年   33篇
  1998年   23篇
  1997年   16篇
  1996年   10篇
  1995年   19篇
  1994年   14篇
  1993年   14篇
  1992年   14篇
  1991年   7篇
  1990年   13篇
  1989年   8篇
  1988年   8篇
  1987年   4篇
  1986年   3篇
  1985年   12篇
  1984年   13篇
  1983年   3篇
  1982年   9篇
  1981年   4篇
  1980年   6篇
  1979年   4篇
  1978年   2篇
  1976年   2篇
  1975年   2篇
  1973年   2篇
排序方式: 共有1907条查询结果,搜索用时 31 毫秒
41.
Nonmedical needs are intricately linked to health. Unaddressed nonmedical needs often result in poorer health and increased healthcare costs. Although social workers are well positioned to address nonmedical needs, their role in healthcare environments to address nonmedical needs is limited. The limited role relates to a lack of reimbursement streams, which stems from poor articulation about their unique contributions. An analysis of a case study in which a social worker using AIMS, a protocolized care coordination model, was undertaken to highlight specific activities performed by social workers. Implications for patient health outcomes and healthcare costs are discussed.  相似文献   
42.
43.
Seizures in newborns do not always show a clear electro-clinical correlation. The real epileptic nature of some stereotyped rhythmic movements, included in the ‘subtle seizures’ and considered as brainstem release phenomena, is still debated. We report a brain injured newborn, who displayed several episodes of repetitive limb movements. The ictal EEG discharge, during one of these episodes, was associated with a motor pattern modification, which was endowed with quadrupedal locomotion kinematic features. This might represent an indirect evidence of cervical and lumbar Central Pattern Generators interconnection with in-phase coordination between diagonal limbs since the first hours of life in humans.  相似文献   
44.
Vision and motor skills are intimately linked, both in their own development and functionally. The solicitation of one can therefore promote the development of the other. The various professionals of motor skills (physiotherapist, psychomotor therapists, occupational therapists) and the orthoptists are called upon to integrate these aspects in the follow-up of the patients, as well in the guides as in the installations.  相似文献   
45.
BackgroundMultiple sclerosis (MS) is a demyelinating disorder of the central nervous system with heterogeneous symptoms. Persons with MS (PwMS) show reduced walking capacity with changes in their gait pattern. It is unknown to which extent coordination deficits are present in PwMS, which can be measured by seated lower leg interlimb coordination tasks, and to which extent they are related to motor and cognitive function.Research questionHow is the control of interlimb coordination of the lower limbs characterized in PwMS compared to healthy controls (HC) during a seated rhythmical coordination task and what is the relationship between interlimb coordination, motor or cognitive function?MethodsRhythmical interlimb coordination was assessed during a single session in 38 PwMS and 13 HC, using a seated rhythmical coordination task, comprising of antiphase flexion-extension of the lower limbs, to metronomes at 0.75 Hz, 1.00 Hz, 1.50 Hz. Outcomes were phase coordination index (PCI), movement amplitude and movement frequency. Correlations between interlimb coordination, motor, and cognitive function were examined.ResultsPwMS showed impaired walking capacity but preserved cognitive function. Mixed model analysis revealed a significant effect of group and metronome frequency for PCI, attenuated by the variability in generating knee (antiphase flexion-extension) movements. Movement amplitude was highest at metronome frequency 1.00 Hz. In PwMS significant correlations were found between PCI and cognitive function when performing the task at metronome frequencies 0.75 Hz and 1.50 Hz, as well as motor function at 1.50 Hz.SignificancePwMS had a higher variability in interlimb coordination compared to HC. The most stable interlimb antiphase coordination mode was performed at 1.00 Hz. Significant correlations support the existence of a relationship between information processing speed, as well as walking impairment, with interlimb coordination. While cognitive and motor control are always needed for interlimb coordination movements, associations are strongest in the deviant higher and lower metronome rhythms.  相似文献   
46.
47.
When making a decision, humans often have to ‘coordinate’—reach the same conclusion—as another individual without explicitly communicating. Relatively, little is known about the neural basis for coordination. Moreover, previous fMRI investigations have supported conflicting hypotheses. One account proposes that individuals coordinate using a ‘gut feeling’ and that this is supported by insula recruitment. Another account proposes that individuals recruit strategic decision-making mechanisms in prefrontal cortex in order to coordinate. We investigate the neural basis for coordination in individuals with behavioral-variant frontotemporal dementia (bvFTD) who have limitations in social decision-making associated with disease in prefrontal cortex. We demonstrate that bvFTD are impaired at establishing a focal point in a semantic task (e.g. ‘Tell me any boy''s name’) that requires coordination relative to a similar, control semantic task that does not. Additionally, coordination limitations in bvFTD are related to cortical thinning in prefrontal cortex. These findings are consistent with behavioral economic models proposing that, beyond a ‘gut feeling’, strategic decision-making contributes to the coordination process, including a probabilistic mechanism that evaluates the salience of a response (e.g. is ‘John’ a frequent boy''s name), a hierarchical mechanism that iteratively models an opponent''s likely response and a mechanism involved in social perspective taking.  相似文献   
48.
Most physiological and biotechnological processes rely on molecular recognition between chiral (handed) molecules. Manmade homogeneous catalysts and enzymes offer complementary means for producing enantiopure (single-handed) compounds. As the subtle details that govern chiral discrimination are difficult to predict, improving the performance of such catalysts often relies on trial-and-error procedures. Homogeneous catalysts are optimized by chemical modification of the chiral environment around the metal center. Enzymes can be improved by modification of gene encoding the protein. Incorporation of a biotinylated organometallic catalyst into a host protein (avidin or streptavidin) affords versatile artificial metalloenzymes for the reduction of ketones by transfer hydrogenation. The boric acid.formate mixture was identified as a hydrogen source compatible with these artificial metalloenzymes. A combined chemo-genetic procedure allows us to optimize the activity and selectivity of these hybrid catalysts: up to 94% (R) enantiomeric excess for the reduction of p-methylacetophenone. These artificial metalloenzymes display features reminiscent of both homogeneous catalysts and enzymes.  相似文献   
49.
50.
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