全文获取类型
收费全文 | 34898篇 |
免费 | 2713篇 |
国内免费 | 95篇 |
专业分类
耳鼻咽喉 | 334篇 |
儿科学 | 1045篇 |
妇产科学 | 902篇 |
基础医学 | 5345篇 |
口腔科学 | 472篇 |
临床医学 | 4990篇 |
内科学 | 6167篇 |
皮肤病学 | 700篇 |
神经病学 | 3911篇 |
特种医学 | 808篇 |
外科学 | 3180篇 |
综合类 | 276篇 |
现状与发展 | 1篇 |
一般理论 | 33篇 |
预防医学 | 3726篇 |
眼科学 | 606篇 |
药学 | 2285篇 |
中国医学 | 42篇 |
肿瘤学 | 2883篇 |
出版年
2024年 | 32篇 |
2023年 | 279篇 |
2022年 | 428篇 |
2021年 | 890篇 |
2020年 | 594篇 |
2019年 | 924篇 |
2018年 | 1099篇 |
2017年 | 855篇 |
2016年 | 938篇 |
2015年 | 971篇 |
2014年 | 1373篇 |
2013年 | 1771篇 |
2012年 | 2798篇 |
2011年 | 2883篇 |
2010年 | 1562篇 |
2009年 | 1419篇 |
2008年 | 2426篇 |
2007年 | 2497篇 |
2006年 | 2254篇 |
2005年 | 2350篇 |
2004年 | 2095篇 |
2003年 | 1954篇 |
2002年 | 1833篇 |
2001年 | 243篇 |
2000年 | 139篇 |
1999年 | 288篇 |
1998年 | 391篇 |
1997年 | 322篇 |
1996年 | 237篇 |
1995年 | 238篇 |
1994年 | 191篇 |
1993年 | 178篇 |
1992年 | 121篇 |
1991年 | 107篇 |
1990年 | 89篇 |
1989年 | 97篇 |
1988年 | 79篇 |
1987年 | 70篇 |
1986年 | 59篇 |
1985年 | 50篇 |
1984年 | 71篇 |
1983年 | 52篇 |
1982年 | 59篇 |
1981年 | 66篇 |
1980年 | 66篇 |
1979年 | 31篇 |
1978年 | 30篇 |
1977年 | 37篇 |
1976年 | 29篇 |
1974年 | 24篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Eric Racine Marie-Josée Dion Christine A. C. Wijman Judy Illes Maarten G. Lansberg 《Neurocritical care》2009,11(3):345-352
Background
Advances in intensive care medicine have increased survival rates of patients with critical neurological conditions. The focus of prognostication for such patients is therefore shifting from predicting chances of survival to meaningful neurological recovery. This study assessed the variability in long-term outcome predictions among physicians and aimed to identify factors that may account for this variability. 相似文献33.
Age determines memory for face identity and expression 总被引:1,自引:1,他引:0
Egemen SAVASKAN Sandra Elisabeth MÜLLER reas BÖHRINGER Christine PHILIPPSEN Franz MÜLLER-SPAHN Hartmut SCHÄCHINGER 《Psychogeriatrics》2007,7(2):49-57
Background: The recognition of facial expressions is an important component of emotion processing which contributes to interactional behavior. One of the factors highly associated with potential decline of ability in behavioral tasks is age. Methods: We have investigated age‐related changes in facial identity and expression memory of healthy subjects in three age groups: young adults (20–40 years), elderly adults (60–80 years) and, for the first time in the literature, very old adults (over 80 years of age). Using a picture test, photographs of faces with happy or angry expressions were presented to study participants during the encoding task, and the memory for identity and emotional facial expression was investigated in a subsequent recognition task showing emotionally neutral faces. Half of the faces presented in the recognition task were initially shown in the encoding task. Results: Age interacted with the memory process: the ability to recognize both facial identity and emotional expression declined with advanced age. Happy facial expressions were better recognized in all age groups. Although there was a continuous overall decrease in recognition of both happy and angry expressions with advanced age, the effect favoring happy facial expressions was stable also in very old adults. Other factors such as gender or educational level did not affect the memory process for facial expressions. Conclusions: Our findings suggest that age is a significant determinant of memory for facial identity and emotional expression, and that, similar to younger adults, the recognition process of the elderly favors happy emotional facial expressions. 相似文献
34.
35.
Jean Marie Jully Marie Christine Béné Gérard Martin Gilbert Faure 《Journal of clinical periodontology》1986,13(3):223-227
The cellular infiltrate present in human diseased gingiva was analyzed in biopsies from 12 patients with gingivitis or periodontitis. The samples studied had been obtained in the course of surgery at inflammatory sites remaining after institution of periodontal treatment. Histological and immunological techniques were used to identify macrophages, B-cells, plasma-cells, T-cells and T cell subsets, as well as cells expressing class II HLA membrane antigens. T-cells appeared as the predominant population, but plasma-cells were also visualized in nearly all samples. Both OKT4+ and OKT8+ cells were seen in all cases, the latter being more numerous in periodontitis patients. Interdigitating-like cells were observed, positively labelled for class II antigens, as well as macrophages which were more numerous in periodontitis patients. These results suggest the participation of all components of the immune response in gingival disease, in a way resembling chronic recurrent inflammatory diseases. 相似文献
36.
37.
38.
Forty-nine children with asthma and their mothers were interviewed regarding their knowledge of asthma, factors that precipitated attacks, and how they attempted to reduce the probability of an attack. Many mothers and children were well aware of factors that precipitated attacks, but took little positive action to reduce attacks. The data suggest that much ill-health in asthmatic children could be reduced by improving education available to mothers and children. 相似文献
39.
Christine D Pollard Susan M Sigward Susumu Ota Karen Langford Christopher M Powers 《Clinical journal of sport medicine》2006,16(3):223-227
OBJECTIVE: To examine the influence of in-season injury prevention training on hip and knee kinematics during a landing task. DESIGN: Longitudinal pre-post intervention study. SETTING: Testing sessions were conducted in a biomechanics research laboratory. PARTICIPANTS: Eighteen female soccer players between the ages of 14 and 17 participated in this study. All subjects were healthy with no current complaints of lower extremity injury. INTERVENTIONS: Testing sessions were conducted prior to and following a season of soccer practice combined with injury prevention training. MAIN OUTCOME MEASUREMENTS: During each testing session three-dimensional kinematics were collected while each subject performed a drop landing task. Peak hip and knee joint angles were measured during the early deceleration phase of landing and compared between pre- and post-training using paired t-tests. RESULTS: Following a season of soccer practice combined with injury prevention training, females demonstrated significantly less hip internal rotation (7.1 degrees vs. 1.9 degrees; P = 0.01) and significantly greater hip abduction (-4.9 degrees vs. -7.7 degrees; P = 0.02). No differences in knee valgus or knee flexion angles were found post-season. CONCLUSIONS: Female soccer players exhibited significant changes in hip kinematics during a landing task following in-season injury prevention training. Our results support the premise that a season of soccer practice combined with injury prevention training is effective in altering lower extremity motions that may play a role in predisposing females to ACL injury. 相似文献
40.