全文获取类型
收费全文 | 26046篇 |
免费 | 1641篇 |
国内免费 | 81篇 |
专业分类
耳鼻咽喉 | 179篇 |
儿科学 | 813篇 |
妇产科学 | 619篇 |
基础医学 | 3918篇 |
口腔科学 | 456篇 |
临床医学 | 3738篇 |
内科学 | 4738篇 |
皮肤病学 | 441篇 |
神经病学 | 2715篇 |
特种医学 | 605篇 |
外科学 | 2131篇 |
综合类 | 173篇 |
一般理论 | 26篇 |
预防医学 | 3020篇 |
眼科学 | 451篇 |
药学 | 1877篇 |
1篇 | |
中国医学 | 57篇 |
肿瘤学 | 1810篇 |
出版年
2024年 | 23篇 |
2023年 | 213篇 |
2022年 | 388篇 |
2021年 | 721篇 |
2020年 | 475篇 |
2019年 | 639篇 |
2018年 | 777篇 |
2017年 | 550篇 |
2016年 | 612篇 |
2015年 | 793篇 |
2014年 | 914篇 |
2013年 | 1463篇 |
2012年 | 2039篇 |
2011年 | 2186篇 |
2010年 | 1138篇 |
2009年 | 1063篇 |
2008年 | 1770篇 |
2007年 | 1836篇 |
2006年 | 1787篇 |
2005年 | 1670篇 |
2004年 | 1580篇 |
2003年 | 1450篇 |
2002年 | 1272篇 |
2001年 | 169篇 |
2000年 | 132篇 |
1999年 | 174篇 |
1998年 | 220篇 |
1997年 | 169篇 |
1996年 | 161篇 |
1995年 | 117篇 |
1994年 | 125篇 |
1993年 | 107篇 |
1992年 | 75篇 |
1991年 | 87篇 |
1990年 | 71篇 |
1989年 | 78篇 |
1988年 | 52篇 |
1987年 | 52篇 |
1986年 | 52篇 |
1985年 | 49篇 |
1984年 | 68篇 |
1983年 | 72篇 |
1982年 | 71篇 |
1981年 | 48篇 |
1980年 | 50篇 |
1979年 | 34篇 |
1978年 | 25篇 |
1977年 | 25篇 |
1976年 | 24篇 |
1974年 | 23篇 |
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
21.
Anita MacDonald Dr Sandra Warrington Chairman Professional Development Committee 《Journal of human nutrition and dietetics》1990,3(2):71-77
At the present time, there are many fundamental issues coming from the Department of Health or from other national organizations, which will have an effect on the future development of the dietetic profession. The British Diatetic Association (BDA) Professional Development Committee will consider these issues, as and when appropriate, and will publish the information in the form of Briefing Papers.
The first Briefing Paper on 'Quality Assurance' was published by the BDA in November 1989. The second on 'Measuring clinical outcome' is published below. In each case the opinion of BDA members and specialist groups has been sought and the Professional Development Committee wishes to thank individuals and the specialist groups for their comments.
The Briefing Papers are intended to provide information and promote discussion among the membership. I would welcome further comments from readers, which may be directed to the British Dietetic Association Office. 相似文献
The first Briefing Paper on 'Quality Assurance' was published by the BDA in November 1989. The second on 'Measuring clinical outcome' is published below. In each case the opinion of BDA members and specialist groups has been sought and the Professional Development Committee wishes to thank individuals and the specialist groups for their comments.
The Briefing Papers are intended to provide information and promote discussion among the membership. I would welcome further comments from readers, which may be directed to the British Dietetic Association Office. 相似文献
22.
Milton J. Guiberteau MD Pamela A. Wilcox RN MBA Sandra Bjork RN JD 《Journal of the American College of Radiology》2004,1(2):92-97
Clinical practice guidelines have emerged as a reality for medical practitioners over the past 20 years. Although virtually all groups interested in the development of practice guidelines hope for improvements in patient care, secondary expectations vary widely among those using them. Their use in daily practice by physicians has met with resistance from barriers including concerns of “cookbook” medicine, a loss of autonomy, and increased professional liability. The recent experience of the ACR in addressing these challenges illustrates that physicians are receptive to steps perceived to mitigate the risks accompanying the use of guidelines as well as to efforts to increase their understanding of implementing guidelines in clinical practice. The experiences of other medical societies and an inventory of future trends reveal additional challenges associated with the use of practice guidelines, as third parties look to guidelines as points of reference for gauging the performance of health care providers. 相似文献
23.
24.
Vincenzo Arizza Nicol Parrinello Sandra Schimmenti 《Developmental and comparative immunology》1991,15(4):219-226
-Lactose specific lectins are released from Phallusia mamillata hemocytes during short-term cultures. The molecular weight of the subunits, the immunological cross-reaction and the sugar specificity suggest that the released lectins are similar to those isolated from the sonicated hemocytes. Because lectin release appears to take place independently of active protein synthesis, the possibility exists that lectins are pre-formed, stored in hemocytes and released when in vitro conditions stimulate the cells. 相似文献
25.
Barry W McColl Ailsa L McGregor Andrew Wong Julian D Harris Andrea Amalfitano Sandra Magnoni Andrew H Baker George Dickson Karen Horsburgh 《Journal of cerebral blood flow and metabolism》2007,27(3):477-487
Apolipoprotein E (apoE, protein; APOE, gene) is the major lipid-transport protein in the brain and plays an important role in modulating the outcome and regenerative processes after acute brain injury. The aim of the present study was to determine if gene transfer of the epsilon3 form of APOE improves outcome in a murine model of transient focal cerebral ischaemia. Mice received an intrastriatal injection of vehicle, a second-generation adenoviral vector containing the green fluorescent protein gene (Ad-GFP) or a vector containing the APOE epsilon3 gene (Ad-APOE) 3 days before 60 mins focal ischaemia. Green fluorescent protein expression was observed in cells throughout the striatum and subcortical white matter indicating successful gene transfer and expression. ApoE levels in the brain were significantly increased after Ad-APOE compared with Ad-GFP or vehicle treatment. Ad-APOE treatment reduced the volume of ischaemic damage by 50% compared with Ad-GFP or vehicle treatment (13+/-3 versus 29+/-4 versus 27+/-5 mm(3)). The extent of postischaemic apoE immunoreactivity was enhanced in Ad-APOE compared with Ad-GFP or vehicle treated mice. These results show the ability of APOE gene transfer to markedly improve outcome after cerebral ischaemia and suggest that modulating apoE levels may be a potential strategy in human stroke therapy. 相似文献
26.
27.
28.
Joseph D. obias MD Sandra Lowe MD George W. Holcomb III MD 《Journal of clinical anesthesia》1992,4(6):484-486
The case of a 3-day-old infant with Beckwith-Wiedemann syndrome who required anesthetic care during closure of an abdominal wall defect is presented. Beckwith-Wiedemann syndrome comprises a constellation of clinical features, including macroglossia, macrosomia, omphalocele, visceromegaly, mild microcephaly, facial nevus flammeus, horizontal earlobe creases, and renal medullary dysplasia. Due to the high rate of omphalocele in this syndrome, anesthetic care is frequently required during the neonatal period. Many of these infants (greater than 50%) are born prematurely. Therefore, their anesthetic care may be further complicated by associated diseases of prematurity, such as hyaline membrane disease. Additional anesthetic implications of this syndrome relate to the occurrence and management of hypoglycemia and polycythemia. Careful intraoperative management of glucose homeostasis is particularly important, since eventual neurologic outcome and intelligence will be normal provided prolonged neonatal hypoglycemia is avoided. Preoperative evaluation of the cardiac and genitourinary system, including echocardiography and renal ultrasound, are recommended because of the frequent occurrence of associated anomalies with omphalocele. 相似文献
29.
Tony Hope Kathleen M. Tilling Kathy Gedling Janet M. Keene Sandra D. Cooper Christopher G. Fairburn 《International journal of geriatric psychiatry》1994,9(2):149-155
‘Wandering’ is one of the most troublesome of behavioural problems in dementia. The term ‘wandering’ covers many different types of behaviour. We examined the hypothesis that the different types of wandering behaviour seen in dementia from a scale using data collected on 83 elderly subjects suffering from either Alzheimer's disease or multiinfarct dementia. We reject the scaling hypothesis. Our data suggest that there are three main categories of wandering behaviour, and that one of these categories is usefully divided into four subcategories. 相似文献
30.