全文获取类型
收费全文 | 25006篇 |
免费 | 1958篇 |
国内免费 | 53篇 |
专业分类
耳鼻咽喉 | 180篇 |
儿科学 | 971篇 |
妇产科学 | 775篇 |
基础医学 | 3418篇 |
口腔科学 | 419篇 |
临床医学 | 3340篇 |
内科学 | 4558篇 |
皮肤病学 | 336篇 |
神经病学 | 2978篇 |
特种医学 | 456篇 |
外科学 | 2139篇 |
综合类 | 319篇 |
一般理论 | 47篇 |
预防医学 | 3225篇 |
眼科学 | 453篇 |
药学 | 1738篇 |
中国医学 | 31篇 |
肿瘤学 | 1634篇 |
出版年
2023年 | 223篇 |
2022年 | 258篇 |
2021年 | 522篇 |
2020年 | 380篇 |
2019年 | 591篇 |
2018年 | 658篇 |
2017年 | 518篇 |
2016年 | 511篇 |
2015年 | 591篇 |
2014年 | 874篇 |
2013年 | 1223篇 |
2012年 | 1789篇 |
2011年 | 1859篇 |
2010年 | 982篇 |
2009年 | 947篇 |
2008年 | 1526篇 |
2007年 | 1673篇 |
2006年 | 1643篇 |
2005年 | 1532篇 |
2004年 | 1516篇 |
2003年 | 1368篇 |
2002年 | 1292篇 |
2001年 | 334篇 |
2000年 | 270篇 |
1999年 | 271篇 |
1998年 | 272篇 |
1997年 | 232篇 |
1996年 | 178篇 |
1995年 | 168篇 |
1994年 | 137篇 |
1993年 | 167篇 |
1992年 | 159篇 |
1991年 | 152篇 |
1990年 | 125篇 |
1989年 | 123篇 |
1988年 | 102篇 |
1987年 | 95篇 |
1986年 | 76篇 |
1985年 | 104篇 |
1984年 | 81篇 |
1983年 | 102篇 |
1982年 | 99篇 |
1981年 | 92篇 |
1980年 | 96篇 |
1979年 | 79篇 |
1978年 | 67篇 |
1976年 | 62篇 |
1974年 | 68篇 |
1973年 | 72篇 |
1972年 | 54篇 |
排序方式: 共有10000条查询结果,搜索用时 23 毫秒
21.
22.
The present paper introduces the concept of the narcissistically vulnerable system by suggesting that organizations may manifest some of the same pathological characteristics as narcissistic individuals. The public mental hospital was chosen as an example of such a system. Reasons for its vulnerability were suggested and specific defenses, employed at the system level, were discussed. Finally, remedies for the repair of the narcissistically vulnerable system were considered. 相似文献
23.
J R Haaga D B Owens R W Kellermeyer D Shina K Pilai N Began 《Journal of computer assisted tomography》1987,11(6):1077-1078
We describe the use of percutaneous CT guidance for localization and placement of 192Ir sources into a patient with pancreatic carcinoma. We have shown the feasibility of this procedure and the lack of complications which are probably due to minimal damage to tissue involved. Computed tomography is ideally suited for percutaneous implantation because it provides the most accurate method for needle placement within the abdomen. 相似文献
24.
Helen E. Savaki Jean-Antoine Girault Umberto Spampinato Ngog-An Truong Jacques Glowinski Marie-Jo Besson 《Brain research bulletin》1986,16(2)
The release of newly synthesized 3H-dopamine (3H-DA) was measured in the rat striatum superfused, through a push-pull cannula, with a physiological medium enriched in 3H-tyrosine. The level of spontaneous 3H-DA release was dependent on the topographical localisation of the cannula in the striatum (anterior parts displayed higher levels than posterior ones) and on the anesthetic state (halothane anesthetized rats demonstrated higher levels than awake ones). Inhibition of DA inactivation processes by local application of benztropine (a DA reuptake inhibitor, 10−6 M) or by IV administration of pargyline (a MAO inhibitor, 100 mg/kg) enhanced the detectable outflow of 3H-DA from the striatum in both halothane anesthetized and awake rats. Local application of D-amphetamine (10−5 M) or acetylcholine (5 × 10−5 M) in the presence of eserine (5 × 10−5 M) evoked respectively a fivefold and a 30% increase in spontaneous 3H-DA release in halothane anesthetized rats. Inhibition of the firing of dopaminergic neurons by IV injection of gamma-hydroxybutyrate (400 mg/kg) produced a 30% decrease in striatal 3H-DA release. The present results demonstrate that the push-pull cannula method is suitable for the study of DA release in both the anesthetized and the awake rat. 相似文献
25.
Reinherz Helen Gordon Alan L. Morris Kathleen M. Anastas Jeane W. 《The journal of primary prevention》1983,4(2):73-95
Journal of Prevention - The major issues involved in the design and implementation of effective school screening programs are addressed, using data from a longitudinal study following over 500... 相似文献
26.
27.
Helen Tager-Flusberg Kate Sullivan 《Journal of autism and developmental disorders》1994,24(5):577-586
Compared the performance of autistic and mentally retarded subjects, all of whom had passed a standard first-order test of false belief, on a new second-order belief task 12 autistic and 12 mentally retarded subjects, matched on verbal mental age (assessed by PPVT and a sentence comprehension subtest of the CELF) and full-scale IQ were given two trials of a second-order reasoning task which was significantly shorter and less complex than the standard task used in all previous research. The majority of subjects in both groups passed the new task, and were able to give appropriate justifications to their responses. No group differences were found in performance on the control or test questions. Findings are interpreted as evidence for the role of information processing factors rather than conceptual factors in performance on higher order theory of mind tasks.This study was supported by a grant from the National Institute of Deafness and Other Communication Disorders (1RO1 DC 01234). We thank Jason Barker for his extensive help with this study. We are also very grateful to the schools where the study was conducted including the League School, and the public school systems in the following towns in Massachusetts: Hanover, Hanson, Hingham, Milton, Plymouth, and Rockland. We offer special thanks to Alan Dewey, Mary Dollar, Sandy D'Giacomo, Herman Fishbein, William Griffin, Nancy Kearns, Judy Monahan, Debbie Newhall, Cay Riley, Robert Sherman, and Kathy Staska for their continued support of our research. 相似文献
28.
29.
Helen Schietinger 《Death Studies》1988,12(5):481-499
People with AIDS are homeless for a variety of reasons, including financial devastation, rejection based on fear of contagion or fear of the dying process, and homeless-ness prior to a diagnosis of AIDS. The author developed and directed the Shanti AIDS Residence Program in San Francisco, the first program to provide housing for people with AIDS. This model is appropriate for single, independent people able to live cooperatively with others. It provides shared living situations for three to six people per apartment, and office staff physically maintain the houses and assure that the needs for community-based home care and other services are met. Other models are proposed for people who are physically or cognitively dependent (and require physical care or supervision in addition to housing), who are socially unable to live cooperatively with others in an unstrucured living environment (e.g., active substance users or the emotionally disturbed), or who have families (e.g., mothers with dependent children or gay men who live with their lovers). 相似文献
30.