全文获取类型
收费全文 | 15844篇 |
免费 | 1402篇 |
国内免费 | 30篇 |
专业分类
耳鼻咽喉 | 144篇 |
儿科学 | 525篇 |
妇产科学 | 398篇 |
基础医学 | 2084篇 |
口腔科学 | 403篇 |
临床医学 | 1721篇 |
内科学 | 2858篇 |
皮肤病学 | 284篇 |
神经病学 | 1405篇 |
特种医学 | 593篇 |
外科学 | 2585篇 |
综合类 | 325篇 |
一般理论 | 18篇 |
预防医学 | 1396篇 |
眼科学 | 386篇 |
药学 | 1240篇 |
3篇 | |
中国医学 | 12篇 |
肿瘤学 | 896篇 |
出版年
2021年 | 228篇 |
2020年 | 142篇 |
2019年 | 231篇 |
2018年 | 256篇 |
2017年 | 187篇 |
2016年 | 227篇 |
2015年 | 270篇 |
2014年 | 367篇 |
2013年 | 534篇 |
2012年 | 767篇 |
2011年 | 838篇 |
2010年 | 433篇 |
2009年 | 396篇 |
2008年 | 665篇 |
2007年 | 675篇 |
2006年 | 693篇 |
2005年 | 595篇 |
2004年 | 582篇 |
2003年 | 584篇 |
2002年 | 480篇 |
2001年 | 460篇 |
2000年 | 505篇 |
1999年 | 411篇 |
1998年 | 210篇 |
1997年 | 136篇 |
1996年 | 168篇 |
1995年 | 148篇 |
1994年 | 127篇 |
1993年 | 142篇 |
1992年 | 395篇 |
1991年 | 359篇 |
1990年 | 370篇 |
1989年 | 350篇 |
1988年 | 347篇 |
1987年 | 327篇 |
1986年 | 306篇 |
1985年 | 334篇 |
1984年 | 260篇 |
1983年 | 212篇 |
1982年 | 151篇 |
1981年 | 122篇 |
1980年 | 123篇 |
1979年 | 236篇 |
1978年 | 172篇 |
1977年 | 125篇 |
1976年 | 123篇 |
1974年 | 119篇 |
1973年 | 128篇 |
1972年 | 112篇 |
1970年 | 115篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
31.
J E Bright A C Woodman T C Marrs S G Wood 《Xenobiotica; the fate of foreign compounds in biological systems》1987,17(1):79-83
A methaemoglobin former, 4-aminopropiophenone (p-aminopropiophenone, PAPP), which is active only after metabolic activation in vivo, exhibits a sex difference in male Beagle dogs and bitches. Bitches produced more methaemoglobin for a given dose of PAPP than male dogs. The probable reason for this difference was a lower rate of N-hydroxylation in male dogs. 相似文献
32.
G M Wood B Sidhu W A Saunders A M Zalin D A Heath 《Postgraduate medical journal》1987,63(743):741-744
Four women presented with symptomatic hypercalcaemia and raised concentrations of serum parathyroid hormone (PTH). In each case, serum calcium returned spontaneously to normal. In two patients serum PTH also fell to the normal range and biochemical relapse has not occurred despite prolonged follow-up. In the others, serum PTH remained elevated and subsequent symptomatic hypercalcaemia necessitated parathyroidectomy. In the first two cases, autoparathyroidectomy is the most likely explanation; the initial fall in serum calcium in the other two patients is unexplained. Large fluctuations in serum calcium may occur in some patients with hyperparathyroidism and prolonged and careful observation is required when this occurs. 相似文献
33.
D T Wade V A Wood A Heller J Maggs R Langton Hewer 《Scandinavian journal of rehabilitation medicine》1987,19(1):25-30
Sixty surviving patients had their walking ability and speed assessed regularly over the first 3 months after an acute stroke. Sixty-four matched controls were studied to allow categorisation of speed as 'slow' or 'normal'. Fourteen patients never had any significant loss of walking speed; fifteen patients never recovered the ability to walk and one patient remained dependent upon verbal support. Of the 30 showing significant recovery, only 10 regained normal speed, and 8 remained dependent upon a physical aid at 3 months. Plotting individual recovery curves of walking speed over time showed the wide range of change which may be expected. It is argued that timing of gait over 10 metres is a valid reliable measure that is currently underused. 相似文献
34.
Neuropsychological assessment, neuroimaging, and neuropsychiatric evaluation in pediatric and adult patients with sickle cell disease (SCD)
下载免费PDF全文
![点击此处可从《Neuropsychiatric Disease and Treatment》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Christopher L Edwards Renee Dunn Raynor Miriam Feliu Camela McDougald Stephanie Johnson Donald Schmechel Mary Wood Gary G Bennett Patrick Saurona Melanie Bonner Chante Wellington Laura M DeCastro Elaine Whitworth Mary Abrams Patrick Logue Lekisha Edwards Salutario Martinez Keith E Whitfield 《Neuropsychiatric Disease and Treatment》2007,3(6):705-709
Traditionally, neuropsychological deficits due to Sickle Cell Disease (SCD) have been understudied in adults. We have begun to suspect, however, that symptomatic and asymptomatic Cerebrovascular Events (CVE) may account for an alarming number of deficits in this population. In the current brief review, we critically evaluated the pediatric and adult literatures on the neurocognitive effects of SCD. We highlighted the studies that have been published on this topic and posit that early detection of CVE via neurocognitive testing, neuropsychiatric evaluations, and neuroimaging may significantly reduce adult cognitive and functional morbidities. 相似文献
35.
Eric Emerson Janet Robertson Justin Wood 《Journal of Applied Research in Intellectual Disabilities》2004,17(2):77-84
Background The aim of the present study was to identify factors associated with the level of psychological distress reported by family carers of children with intellectual disability living in a large urban conurbation. Method Information was collected by postal questionnaire (or interview for family carers who did not have English as their first language) from the family carers of 408 children with intellectual disability (31% of all children within the area administratively identified as having an intellectual disability). Results Results indicated that 47% of primary carers scored above the threshold for psychological distress on the GHQ and that scoring above the threshold was strongly related to the emotional and behavioural needs of the index child and South‐Asian ethnicity and moderately associated with the severity of the child's delay in communication. Conclusions The rates of psychological distress (47% overall, 70% among South‐Asian carers) were markedly higher than that found in previous studies of carers supporting a child with intellectual disabilities. It is suggested that these elevated rates of psychological distress may be mediated by socio‐economic deprivation. 相似文献
36.
37.
Chorioretinal neovascular membranes complicating contusional eye injuries with indirect choroidal ruptures.
下载免费PDF全文
![点击此处可从《The British journal of ophthalmology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Chorioretinal neovascular membranes are a recognised but rare cause of late visual loss in eyes suffering contusional injuries. A series of eight cases is presented all with indirect choroidal ruptures involving the perifoveal region. Two main patterns of 'at risk' rupture were noted: a temporally situated rupture passing almost directly through the fovea, and a rupture which curves inferior or superior to the optic disc stopping just short of the fovea. In six of eight cases there was only a partial thickness rupture of the choroid. These neovascular membranes may present at any time after the original injury, either early (within six months of the injury), which could be related to persistence of the normal reparative neovascular response, or late (at least one year after the injury), which are more likely to have resulted from a secondary breakdown of the outer blood-retina barrier. 相似文献
38.
R Wood 《Suid-Afrikaanse tydskrif vir geneeskunde》1990,77(7):369-370
A case of benign symmetrical lipomatosis (Madelung-Launois-Bensaude syndrome) is described. The characteristic clinical features and the association with chronic alcoholism are reported. 相似文献
39.
In an attempt to assess whether there are any characteristics which a majority of ordinary people regard as life-affirming or life-denying, a questionnaire was given to a pilot group of 167 respondents, representing three different age and social categories. Five life-affirming and five life-denying characteristics were mentioned by more than 10% of respondents. Of the former, Drive, Sociability, Happiness and Optimism were endorsed by 15-20%. Of the latter, Unsociability and Poor Coping were mentioned by 22%, making them distinctly more frequent than the following categories of Pessimism, Lack of Drive and Unhappiness (11-14%). It is suggested that a number of these subjectively determined characteristics, which the general public perceive as being life-affirming or denying, do indeed influence physical or mental health, illness or illness behaviour. It may therefore be of value to utilize this set of public perceptions in future programmes of health education. 相似文献
40.
Evidence that the earliest generated cells of the murine cerebral cortex form a transient population in the subplate and marginal zone. 总被引:7,自引:0,他引:7
We used bromodeoxyuridine to label the earliest generated cells of the murine cerebral cortex while they were dividing, and then observed their distributions at several instances later in development. Shortly before birth, many of the labelled cells were either above the cortical plate, in the marginal zone, or below it, in the region known as the subplate in other species. These cells had disappeared by postnatal day 21. 相似文献