全文获取类型
收费全文 | 2004篇 |
免费 | 149篇 |
国内免费 | 7篇 |
专业分类
耳鼻咽喉 | 28篇 |
儿科学 | 57篇 |
妇产科学 | 65篇 |
基础医学 | 410篇 |
口腔科学 | 31篇 |
临床医学 | 178篇 |
内科学 | 322篇 |
皮肤病学 | 62篇 |
神经病学 | 165篇 |
特种医学 | 174篇 |
外科学 | 210篇 |
综合类 | 15篇 |
预防医学 | 155篇 |
眼科学 | 30篇 |
药学 | 184篇 |
中国医学 | 13篇 |
肿瘤学 | 61篇 |
出版年
2023年 | 17篇 |
2022年 | 25篇 |
2021年 | 44篇 |
2020年 | 32篇 |
2019年 | 46篇 |
2018年 | 97篇 |
2017年 | 64篇 |
2016年 | 113篇 |
2015年 | 89篇 |
2014年 | 113篇 |
2013年 | 205篇 |
2012年 | 104篇 |
2011年 | 75篇 |
2010年 | 128篇 |
2009年 | 65篇 |
2008年 | 74篇 |
2007年 | 68篇 |
2006年 | 70篇 |
2005年 | 51篇 |
2004年 | 34篇 |
2003年 | 33篇 |
2002年 | 41篇 |
2001年 | 29篇 |
2000年 | 33篇 |
1999年 | 23篇 |
1998年 | 30篇 |
1997年 | 20篇 |
1996年 | 20篇 |
1995年 | 17篇 |
1994年 | 15篇 |
1993年 | 17篇 |
1992年 | 14篇 |
1991年 | 10篇 |
1990年 | 14篇 |
1989年 | 17篇 |
1986年 | 15篇 |
1984年 | 12篇 |
1982年 | 10篇 |
1981年 | 13篇 |
1980年 | 11篇 |
1979年 | 13篇 |
1977年 | 14篇 |
1976年 | 13篇 |
1975年 | 13篇 |
1974年 | 9篇 |
1973年 | 9篇 |
1967年 | 13篇 |
1965年 | 11篇 |
1964年 | 8篇 |
1963年 | 10篇 |
排序方式: 共有2160条查询结果,搜索用时 15 毫秒
1.
ABSTRACTAlthough communication about sexuality is a significant pathway through which peers influence adolescent sexual development, little research has examined the role of peer networks in the use of sexualized media. We applied a social network approach to assess the role of close peers in adolescent pornography use and sexting in a sample of Croatian high school students. Sexual conversation networks’ characteristics did not correlate with pornography use. In contrast, sexting was associated with the proportion of same gender peers, the proportion of older peers and the proportion of sexually experienced peers in the network – pointing to the role of peer influence. Participants’ gender did not moderate these associations. Specific mechanisms underlying the observed associations and the role of peer selection remain important tasks for future research. 相似文献
2.
Journal of Assisted Reproduction and Genetics - 相似文献
3.
4.
5.
6.
7.
8.
The temporal bones from fetuses with known autosomal trisomy syndromes were examined histopathologically after spontaneous or induced abortions. Fetal ages dated from the 17th to the 24th week of pregnancy. In all, 17 temporal bones from nine fetuses were studied and included seven cases of Down's syndrome and two of Edwards' syndrome. Temporal bones from fetuses with Down's syndrome had more abnormalities of the external and middle ears than of the inner ear. The bones from the fetuses with Edwards' syndrome showed abnormalities of the external or middle ear and retarded development of the inner ear (failed ossification of the otic capsule and unformed organ of Corti). 相似文献
9.
Mirna SuČIĆ Dubravka Boban Mirjana MarkoviĆ-glamoČak Mladen PetroveČki Matko MaruŠIĆ Boris Labar 《Medical oncology (Northwood, London, England)》1992,9(1):41-45
Cytochemical analysis of leukemic blasts from 46 patients with acute myeloblastic M2 leukemia (according to the FAB classification)
was performed before and after cytostatic therapy, and compared with findings obtained in 20 age- and sex-matched control
subjects. Cytochemical findings for myeloperoxidase (MPO), Sudan black B, acid phosphatase and alpha-naphthyl-acetate esterase
(ANAE) were related to the achievement of the first complete remission (CR),i.e. data were compared after the patients had been divided into CR and non-CR groups. The analysis clearly showed that a high
proportion of myeloperoxidase- and, to a lesser extent, Sudan black B-positive blasts before treatment may have constituted
a significantly unfavourable prognostic factor. 相似文献
10.
Silvia Samarin Lovric Viktor Avbelj Roman Trobec Darko Zorman Peter Rakovec Sergej Hojker Borut Gersak Metka Milcinski 《European journal of cardio-thoracic surgery》2004,26(4):736-741
OBJECTIVE: Complete allograft denervation occurs during heart transplantation. Partial ventricular sympathetic reinnervation may develop one year or later after transplantation and can be measured with iodine-123-meta-iodobenziylguanidine (MIBG) uptake. Aim of this study was to assess sinus node sympathetic reinnervation measured with heart rate variability and ventricular sympathetic reinnervation evaluated with MIBG. METHODS: Twelve patients and 14 healthy controls were included. In patients, MIBG scintigraphy with early and late imaging was performed. Heart to mediastinum ratio (HMR) was calculated and patients were divided in groups with (HMR>1.3) and without left ventricular reinnervation (HMR<1.3). Bipolar ECG with high sampling rate and resolution was recorded over 8.5 min in supine position and in upright position after 10 min interval. R-R intervals in time domain and heart rate variability in frequency domain through spectral power analysis of R-R intervals were analysed to evaluate sinus node reinnervation. Spectral power in low frequency range (0.04-0.15 Hz) above 4.5 ms(2) was considered as sinus node sympathetic reinnervation. RESULTS: Six (50%) patients had evidence of left ventricular sympathetic reinnervation on scintigraphy. Sinus node sympathetic reinnervation based on heart rate variability was detected in 6 (50%) patients in supine, and in 4 (33%) patients in upright body position. Four patients groups were discerned: (1) with ventricular and sinus node sympathetic reinnervation, (2) with sinus node sympathetic reinnervation, (3) with ventricular sympathetic reinnervation and (4) without atrial or ventricular sympathetic reinnervation. Ventricular reinnervation process was time dependent and sinus node reinnervation was not. CONCLUSIONS: Simultaneous ventricular sympathetic reinnervation assessed by MIBG and sinus node sympathetic reinnervation assessed by heart rate variability in supine as in upright position were detected only in two patients (17%). The results of our study show that eventual sinus node sympathetic reinnervation and left ventricular sympathetic reinnervation do not occur simultaneously. 相似文献