全文获取类型
收费全文 | 12865篇 |
免费 | 713篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 383篇 |
妇产科学 | 187篇 |
基础医学 | 1598篇 |
口腔科学 | 405篇 |
临床医学 | 1371篇 |
内科学 | 2522篇 |
皮肤病学 | 159篇 |
神经病学 | 1237篇 |
特种医学 | 352篇 |
外科学 | 2021篇 |
综合类 | 101篇 |
一般理论 | 9篇 |
预防医学 | 859篇 |
眼科学 | 306篇 |
药学 | 1026篇 |
中国医学 | 19篇 |
肿瘤学 | 952篇 |
出版年
2023年 | 103篇 |
2022年 | 132篇 |
2021年 | 236篇 |
2020年 | 220篇 |
2019年 | 312篇 |
2018年 | 296篇 |
2017年 | 279篇 |
2016年 | 310篇 |
2015年 | 302篇 |
2014年 | 431篇 |
2013年 | 671篇 |
2012年 | 884篇 |
2011年 | 889篇 |
2010年 | 475篇 |
2009年 | 470篇 |
2008年 | 800篇 |
2007年 | 839篇 |
2006年 | 785篇 |
2005年 | 711篇 |
2004年 | 696篇 |
2003年 | 662篇 |
2002年 | 601篇 |
2001年 | 131篇 |
2000年 | 101篇 |
1999年 | 143篇 |
1998年 | 170篇 |
1997年 | 157篇 |
1996年 | 123篇 |
1995年 | 105篇 |
1994年 | 111篇 |
1993年 | 82篇 |
1992年 | 80篇 |
1991年 | 93篇 |
1990年 | 85篇 |
1989年 | 85篇 |
1988年 | 68篇 |
1987年 | 68篇 |
1986年 | 73篇 |
1985年 | 87篇 |
1984年 | 71篇 |
1983年 | 61篇 |
1982年 | 90篇 |
1981年 | 50篇 |
1980年 | 50篇 |
1979年 | 51篇 |
1978年 | 38篇 |
1977年 | 33篇 |
1976年 | 35篇 |
1975年 | 24篇 |
1974年 | 26篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
Background
In spite of succesful adoption of electronic patient records (EPR) by Norwegian GPs, what constitutes the actual benefits and effects of the use of EPRs in the perspective of the GPs and patients has not been fully characterized. We wanted to study primary care physicians' use of electronic patient record (EPR) systems in terms of use of different EPR functions and the time spent on using the records, as well as the potential effects of EPR systems on the clinician-patient relationship. 相似文献992.
993.
994.
995.
996.
Jonas K. E. Persson Håkan Aldskogius Jan Arvidsson Anders Holmberg 《Anatomy and embryology》1991,184(6):591-604
Summary Ultrastructural changes in the gracile nucleus of the rat have been examined after peripheral nerve injury. The sciatic nerve of adult rats was transected at mid-thigh level, and after survival times ranging from 1 day to 32 weeks sections from the gracile nucleus were prepared for electron microscopic examination. Unoperated animals served as controls. Atypical profiles were regularly observed in the experimental cases at post-operative survival times from 3 days up to 32 weeks. It was sometimes not possible to classify these as pre-terminal axons or terminals, because synaptic contacts could not be identified. The two most common changes throughout the entire post-operative period were greatly expanded myelinated axons, or unmyelinated profiles containing numerous mitochondria, osmiophilic dense bodies and vacuoles. Atypical profiles were occasionally observed in unoperated control animals. The results clearly show that various types of degenerative changes occur in the gracile nucleus after peripheral nerve injury. These changes differ markedly from previously described transganglionic changes in other systems. It cannot be excluded that some of the changes reflect growth-related reactions, although the typical features of axon regeneration could not be found. 相似文献
997.
998.
Osteopenia of the tibia and femur caused by an external fixator in the tibia was studied in 14 rabbits. Eight rabbits were treated with a complete unilateral external fixator in one tibia, whereas the other tibia served as a control. The other 6 animals had one leg operated on with inserting of all the pins but without the frame. This technique was chosen to compare osteopenia caused by stress protection and the effect of the pins. After 6 weeks, we found a 7 percent reduction in the bone mineral content in the tibial diaphyseal segment between the pins of the external fixator and no bone loss in the tibia that were operated on with only pins. In the femurs, there was a smaller decrease in the bone mineral content: respectively 3.2 percent (complete frame) and 2.9 percent (only pins). On all the operated on tibiae, there was an increase in the bone mineral content around the pins both proximally and distally. 相似文献
999.
1000.
Charles H. Zeanah Marcia A. Keener † Thomas F. Anders 《Journal of child psychology and psychiatry, and allied disciplines》1986,27(4):499-512
Controversies about temperamental assessments raise questions about whether questionnaires, which assess parental perceptions of temperament, validly measure within-child characteristics. Thirty-eight couples were recruited from childbirth classes for a short-term longitudinal study. Mother's perceptions of activity, rhythmicity and mood were moderately stable from late pregnancy to 6 mth postnatally. Only father's perceptions of activity were stable during this time. Infants rated by parents as difficult on the Carey Infant Temperament Questionnaire at 6 mth were rated by observers as less responsive while being fed by their mothers. Results are discussed in the context of influences on parental perceptions of temperament. 相似文献