全文获取类型
收费全文 | 204959篇 |
免费 | 2927篇 |
国内免费 | 206篇 |
专业分类
耳鼻咽喉 | 1374篇 |
儿科学 | 7409篇 |
妇产科学 | 3779篇 |
基础医学 | 19970篇 |
口腔科学 | 2239篇 |
临床医学 | 15053篇 |
内科学 | 37217篇 |
皮肤病学 | 1116篇 |
神经病学 | 19177篇 |
特种医学 | 9772篇 |
外国民族医学 | 1篇 |
外科学 | 33087篇 |
综合类 | 2574篇 |
现状与发展 | 1篇 |
一般理论 | 22篇 |
预防医学 | 20578篇 |
眼科学 | 3347篇 |
药学 | 11227篇 |
中国医学 | 704篇 |
肿瘤学 | 19445篇 |
出版年
2023年 | 176篇 |
2022年 | 354篇 |
2021年 | 855篇 |
2020年 | 501篇 |
2019年 | 748篇 |
2018年 | 22642篇 |
2017年 | 17909篇 |
2016年 | 20053篇 |
2015年 | 1689篇 |
2014年 | 1900篇 |
2013年 | 2239篇 |
2012年 | 8907篇 |
2011年 | 23015篇 |
2010年 | 19922篇 |
2009年 | 12507篇 |
2008年 | 21241篇 |
2007年 | 23426篇 |
2006年 | 2197篇 |
2005年 | 3776篇 |
2004年 | 4969篇 |
2003年 | 5770篇 |
2002年 | 3874篇 |
2001年 | 906篇 |
2000年 | 955篇 |
1999年 | 704篇 |
1998年 | 518篇 |
1997年 | 452篇 |
1996年 | 338篇 |
1995年 | 338篇 |
1994年 | 271篇 |
1993年 | 233篇 |
1992年 | 358篇 |
1991年 | 385篇 |
1990年 | 406篇 |
1989年 | 363篇 |
1988年 | 271篇 |
1987年 | 230篇 |
1986年 | 228篇 |
1985年 | 208篇 |
1984年 | 169篇 |
1983年 | 154篇 |
1982年 | 128篇 |
1981年 | 87篇 |
1980年 | 90篇 |
1979年 | 102篇 |
1974年 | 97篇 |
1972年 | 67篇 |
1970年 | 77篇 |
1969年 | 97篇 |
1968年 | 91篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
Pilar Nicolás 《Hereditary cancer in clinical practice》2007,5(3):144-152
The specific characteristics of genetic data lead to ethical-legal conflicts in the framework of genetic diagnosis. Several international organisations, including UNESCO and the Council of Europe, have enacted rules referring to the use of genetic information. This paper discusses possible legal and ethical criteria that could be used in genetic testing. 相似文献
64.
Mentally retarded adolescents and MA-matched nonretarded children participated in three experiments designed to examine differences in language-processing efficiency. A compressed speech technique was used in Experiments 1 and 2. Experiment 3 relied on a sentence-picture verification procedure. Our results suggest that retarded and nonretarded individuals differ in the speed with which they are able to execute the semantic-analytic processes but not necessarily the phonological encoding processes that are involved in auditory language comprehension. In addition, the data suggest a possible group difference in the quality of the semantic representation encoded during sentence processing. 相似文献
65.
Nerve growth factor (NGF) and NGF receptors were measured in cortex and hippocampus of rats treated with drugs affecting cholinergic neurotransmission. High (Kd= 0.045nM) and low (Kd= 21nM) affinity125I-NGF binding sites were present in both cortical and hippocampal membranes with hippocampus containing higher numbers of both sites than cortex. Chronic treatment of rats with the muscarinic receptor antagonist scopolamine (5 mg/kg, twice daily) decreased the density of high- and low-affinity sites by 50–90% in cortical and hippocampal membranes. These changes were seen after 7 days, but not 3 days, of scopolamine treatment. Chronic infusion of physostigmine (1 mg/kg/day) using minipumps increased the number of high- and low-affinity sites in cortex 3- and 6-fold, respectively. The changes in receptor-binding parameters induced by physostigmine were transient as they were evident after 3 days of treatment, but returned to control levels after 7 days. NGF content in cortex and hippocampus was reduced by about 50% following 7, but not 3, days of chronic physostigmine infusion. In contrast, scopolamine treatment failed to change NGF levels in the cholinergic neuronal target regions but it decreased NGF content in the septal area. The content of NGF mRNA in the cortex measured by Northern blot analysis failed to change following either scopolamine or physostigmine treatment. The results suggest that levels of NGF and NGF receptors in the target regions of cholinergic neurons are regulated by the extent of cholinergic neurotransmitter activity. 相似文献
66.
67.
Sergio Barroilhet Adrián Cano-Prous Salvador Cervera-Enguix Maria João Forjaz Francisco Guillén-Grima 《Social psychiatry and psychiatric epidemiology》2009,44(12):1051-1065
Introduction
This paper presents the results of a study on the psychometric properties of an authorized Spanish version of the McMaster Family Assessment Device, a self-report measure of family functioning. 相似文献68.
69.
70.