全文获取类型
收费全文 | 19058篇 |
免费 | 3502篇 |
国内免费 | 144篇 |
专业分类
耳鼻咽喉 | 470篇 |
儿科学 | 573篇 |
妇产科学 | 514篇 |
基础医学 | 1667篇 |
口腔科学 | 361篇 |
临床医学 | 4230篇 |
内科学 | 3605篇 |
皮肤病学 | 457篇 |
神经病学 | 1549篇 |
特种医学 | 580篇 |
外科学 | 2288篇 |
综合类 | 572篇 |
现状与发展 | 2篇 |
一般理论 | 13篇 |
预防医学 | 3032篇 |
眼科学 | 344篇 |
药学 | 819篇 |
1篇 | |
中国医学 | 107篇 |
肿瘤学 | 1520篇 |
出版年
2023年 | 480篇 |
2022年 | 215篇 |
2021年 | 491篇 |
2020年 | 641篇 |
2019年 | 410篇 |
2018年 | 811篇 |
2017年 | 769篇 |
2016年 | 803篇 |
2015年 | 910篇 |
2014年 | 966篇 |
2013年 | 1404篇 |
2012年 | 922篇 |
2011年 | 869篇 |
2010年 | 790篇 |
2009年 | 919篇 |
2008年 | 702篇 |
2007年 | 700篇 |
2006年 | 749篇 |
2005年 | 618篇 |
2004年 | 585篇 |
2003年 | 555篇 |
2002年 | 523篇 |
2001年 | 439篇 |
2000年 | 321篇 |
1999年 | 346篇 |
1998年 | 375篇 |
1997年 | 382篇 |
1996年 | 398篇 |
1995年 | 334篇 |
1994年 | 270篇 |
1993年 | 203篇 |
1992年 | 262篇 |
1991年 | 279篇 |
1990年 | 229篇 |
1989年 | 252篇 |
1988年 | 229篇 |
1987年 | 206篇 |
1986年 | 199篇 |
1985年 | 187篇 |
1984年 | 158篇 |
1983年 | 146篇 |
1982年 | 109篇 |
1981年 | 132篇 |
1980年 | 100篇 |
1979年 | 96篇 |
1978年 | 100篇 |
1977年 | 98篇 |
1976年 | 98篇 |
1974年 | 83篇 |
1972年 | 87篇 |
排序方式: 共有10000条查询结果,搜索用时 62 毫秒
61.
B D Royston D Royston S B Coade D M Morgan J D Pearson 《Thrombosis and haemostasis》1992,67(1):172-175
The release of prostacyclin (PGI2) and von Willebrand factor (vWF) from human umbilical vein endothelial cells (HUVEC) was examined to determine if aprotinin had any effects on these endothelial cell reactions. These end-points were chosen to indicate if this serine protease inhibitor caused alterations in the control of haemostatic function by endothelium, in the light of the improvement in haemostasis seen in patients given aprotinin therapy at the time of open heart surgery. Stimuli used to promote secretion of prostacyclin and vWF were human alpha-thrombin, histamine, protamine sulphate, poly-L-lysine and phorbol myristate acetate. Aprotinin (30 microMs) had no significant effect on the basal or stimulated release of PGI2 or vWF from HUVEC. 相似文献
62.
63.
M J Ahern MD FRACP M Wetherall BEd A Leslie MB BS R H James BSc P J Roberts-Thomson PhD FRACP G C Rennie BA BSc MA 《International journal of clinical practice》1992,46(4):229-233
The elderly (age >65 years) are more vulnerable to side-effects induced by non-steroidal anti-inflammatory drugs (NSAIDs). We therefore performed a double-blind comparative study of ketoprofen SR and sulindac in patients with active rheumatoid arthritis, 65 years of age or older. Sulindac was chosen because of its possible renal sparing effects, and ketoprofen SR because of its short half life and sustained release delivery system. Eighty patients were entered. More patients withdrew from the study due to side-effects in the sulindac group; both treatment groups had a high incidence of side-effects during this study and during previous exposure to other NSAIDs, demonstrating that the elderly are susceptible to side-effects from NSAIDs. 相似文献
64.
65.
Data on the effects of laser radiation on primary teeth are scarce. This study investigates the effects of exposing sound
enamel, photo-initiated sound enamel, sound dentine and carious dentine of extracted primary teeth to a pulsed neodymium-yttrium
aluminium garnet laser (Nd-YAG, wavelength 1.06 μm, pulse length 15μs). Each type of tissue was exposed to three fiuences.
Qualitative and quantitative assessments of the irradiated areas revealed that the most marked changes were produced in carious
dentine, followed in ranking order by sound dentine, photo-initiated enamel and sound enamel. Evidence of thermal damage to
the hard tissues peripheral to the fibre-optic tip, and considerable inter-sample variation were found. The experimental evidence
obtained in this in vitro study does not support the clinical use of pulsed laser at 1.06 μm wavelength for cutting primary
enamel and dentine. 相似文献
66.
Acute appendicitis: CT and US correlation in 100 patients 总被引:19,自引:1,他引:18
67.
68.
Promoting autonomy and independence for older people within nursing practice: a literature review 总被引:1,自引:0,他引:1
Sue Davies Bsc Msc RGN RHV Sara Laker BA RGN Lorraine Ellis BA MSc RGN RNT 《Journal of advanced nursing》1997,26(2):408-417
The principles of promoting autonomy and independence underpin many approaches to improving the quality of nursing care for older people in whatever setting, and are in line with wider developments in health care such as the Patient's Charter. However, these concepts require careful definition if nursing practices which might promote autonomy and independence are to be identified. Although the generalizability of the research-based literature in this field is limited by a focus upon older people in continuing-care settings, a review of the literature found a number of indicators associated with attempts to promote patient autonomy and independence. These were grouped into the following categories: systems of care delivery which promote comprehensive individualized assessment and multidisciplinary care planning; attempts to encourage patients/clients to participate in decisions about their care; patterns of communication which avoid exerting power and control over patients/clients and attempts to modify the environment to promote independence and minimize risk. It is suggested that the review identifies a number of principles for nursing practice which can be applied in a range of care settings in order to promote the autonomy and independence of older people. 相似文献
69.