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   4001116篇
  免费   333324篇
  国内免费   15006篇
耳鼻咽喉   55486篇
儿科学   128369篇
妇产科学   106568篇
基础医学   621374篇
口腔科学   108356篇
临床医学   358483篇
内科学   724881篇
皮肤病学   101604篇
神经病学   340191篇
特种医学   157444篇
外国民族医学   797篇
外科学   615943篇
综合类   119569篇
现状与发展   24篇
一般理论   2477篇
预防医学   332254篇
眼科学   92578篇
药学   277248篇
  19篇
中国医学   11436篇
肿瘤学   194345篇
  2021年   55553篇
  2020年   35388篇
  2019年   58492篇
  2018年   72821篇
  2017年   55465篇
  2016年   61414篇
  2015年   74813篇
  2014年   109108篇
  2013年   174374篇
  2012年   112147篇
  2011年   115377篇
  2010年   121939篇
  2009年   125029篇
  2008年   102149篇
  2007年   107904篇
  2006年   117246篇
  2005年   112843篇
  2004年   113794篇
  2003年   104170篇
  2002年   93599篇
  2001年   142462篇
  2000年   137091篇
  1999年   128453篇
  1998年   69361篇
  1997年   66210篇
  1996年   64037篇
  1995年   59449篇
  1994年   53366篇
  1993年   49700篇
  1992年   91208篇
  1991年   86436篇
  1990年   82414篇
  1989年   80309篇
  1988年   74350篇
  1987年   72795篇
  1986年   69062篇
  1985年   67980篇
  1984年   58906篇
  1983年   52966篇
  1982年   45390篇
  1981年   42242篇
  1980年   39823篇
  1979年   49840篇
  1978年   41685篇
  1977年   37226篇
  1976年   34493篇
  1975年   33720篇
  1974年   36418篇
  1973年   35132篇
  1972年   32985篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
181.
182.
183.
184.
While previous randomised controlled trials and meta-analyses offer only limited evidence for the effectiveness of cognitive rehabilitation, qualitative studies examining patient perspectives report more positive outcomes. This meta-synthesis of qualitative studies examined patient perspectives of cognitive rehabilitation for memory, attention, and executive function problems in people with multiple sclerosis. Using set eligibility criteria, we screened electronic databases, reference lists, and academic networks for relevant papers. Seven papers (195 participants) were selected. Two independent researchers conducted quality appraisals of papers. Data analysis, guided by the thematic synthesis approach, yielded six main themes. These suggested that patients benefitted from the group environment in rehabilitation. Cognitive rehabilitation facilitated the participants’ reflection and awareness of their cognitive deficits, and was associated with increased knowledge and understanding of their illness. Increased strategy use was reported and associated with improvements in cognitive functioning and greater confidence and perseverance. Participants reported emotional and social improvements, and felt more optimistic. Overall, these changes had a positive impact on participants’ quality of life. This synthesis of qualitative studies indicates that people with multiple sclerosis who experience cognitive deficits benefit from cognitive rehabilitation programmes. This finding must, however, be viewed in light of the limitations of this meta-synthesis. The meta-synthesis was registered in the PROSPERO database under CRD42017040148.  相似文献   
185.
186.
Sorsby fundus dystrophy (SFD), an autosomal dominant, fully penetrant, degenerative disease of the macula, is manifested by symptoms of night blindness or sudden loss of visual acuity, usually in the third to fourth decades of life due to choroidal neovascularization (CNV). SFD is caused by specific mutations in the Tissue Inhibitor of Metalloproteinase-3, (TIMP3) gene. The predominant histo-pathological feature in the eyes of patients with SFD are confluent 20–30 m thick, amorphous deposits found between the basement membrane of the retinal pigment epithelium (RPE) and the inner collagenous layer of Bruch's membrane. SFD is a rare disease but it has generated significant interest because it closely resembles the exudative or “wet” form of the more common age-related macular degeneration (AMD). In addition, in both SFD and AMD donor eyes, sub-retinal deposits have been shown to accumulate TIMP3 protein. Understanding the molecular functions of wild-type and mutant TIMP3 will provide significant insights into the patho-physiology of SFD and perhaps AMD. This review summarizes the current knowledge on TIMP3 and how mutations in TIMP3 cause SFD to provide insights into how we can study this disease going forward. Findings from these studies could have potential therapeutic implications for both SFD and AMD.  相似文献   
187.
188.
With easy chemical synthesis from its precursor, methamphetamine (MA) is now widespread in many countries. The abuse of methamphetamine is associated with several negative effects on health, because MA is a neurotoxin and a dangerous central nervous system stimulant. It changes levels of neurotransmitters in the brain, releasing dopamine and inhibiting nor epinephrine uptake which increases sympathetic nervous system activity and can lead to cardiac arrhythmia, hypertension and tachypnea. The consequences of MA abuse are clearly manifested in oral diseases (like “meth mouth”) which is characterised by extensive caries, teeth grinding with ensuing dental wear and trismus. The present review was designed to fill the gap in knowledge about methamphetamine abuse in the European Union (EU) and to illustrate the main clinical effects of prolonged use. After describing the pharmacology and systemic effects of methamphetamine and concentrating on its effects on the mouth, the present review compares the epidemiology and incidence of abuse in the world, particularly the USA and the EU. Key words:Methamphetamine, “Meth mouth”, drug abuse, oral health.  相似文献   
189.
190.
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