全文获取类型
收费全文 | 20569篇 |
免费 | 3106篇 |
国内免费 | 1059篇 |
专业分类
耳鼻咽喉 | 97篇 |
儿科学 | 248篇 |
妇产科学 | 307篇 |
基础医学 | 2116篇 |
口腔科学 | 332篇 |
临床医学 | 2603篇 |
内科学 | 2802篇 |
皮肤病学 | 148篇 |
神经病学 | 2246篇 |
特种医学 | 480篇 |
外国民族医学 | 1篇 |
外科学 | 1813篇 |
综合类 | 2959篇 |
现状与发展 | 4篇 |
预防医学 | 2596篇 |
眼科学 | 337篇 |
药学 | 2095篇 |
19篇 | |
中国医学 | 1991篇 |
肿瘤学 | 1540篇 |
出版年
2024年 | 146篇 |
2023年 | 856篇 |
2022年 | 1550篇 |
2021年 | 2259篇 |
2020年 | 1888篇 |
2019年 | 1381篇 |
2018年 | 1078篇 |
2017年 | 1075篇 |
2016年 | 1047篇 |
2015年 | 1168篇 |
2014年 | 2096篇 |
2013年 | 1749篇 |
2012年 | 1425篇 |
2011年 | 1313篇 |
2010年 | 914篇 |
2009年 | 771篇 |
2008年 | 786篇 |
2007年 | 656篇 |
2006年 | 526篇 |
2005年 | 417篇 |
2004年 | 313篇 |
2003年 | 243篇 |
2002年 | 162篇 |
2001年 | 119篇 |
2000年 | 123篇 |
1999年 | 105篇 |
1998年 | 92篇 |
1997年 | 97篇 |
1996年 | 64篇 |
1995年 | 69篇 |
1994年 | 55篇 |
1993年 | 40篇 |
1992年 | 26篇 |
1991年 | 22篇 |
1990年 | 17篇 |
1989年 | 17篇 |
1988年 | 12篇 |
1987年 | 13篇 |
1986年 | 13篇 |
1985年 | 8篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 4篇 |
1981年 | 2篇 |
1980年 | 4篇 |
1979年 | 1篇 |
1978年 | 4篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有10000条查询结果,搜索用时 78 毫秒
81.
Howard Litwin 《European journal of ageing》2007,4(2):71-82
The aim of the inquiry was to examine the social network–mortality association within a wider multivariate context that accounts
for the effects of background framing forces and psychobiological pathways. The inquiry was based upon the Berkman et al.
(2000) conceptual model of the determinants of health. Its main purpose was to identify the salient network correlates of 7-year
all cause mortality among Jewish men and women, aged 70 and over, in Israel (n = 1,811). The investigation utilized baseline data from a national household survey of older adults from 1997 that was linked
to records from the National Death Registry, updated through 2004. At the time of the study, 38% of the sample had died. Multivariate
Cox hazard regressions identified two main network-related components as predictors of survival: contact with friends, a social
network interaction variable, and attendance at a synagogue, a social engagement variable. Friendship ties are seen to uniquely
reduce mortality risk because they are based on choice in nature, and reflect a sense of personal control. Synagogue attendance
is seen to promote survival mainly through its function as a source of communal attachment and, perhaps, as a reflection of
spirituality as well. Other possibly network-related correlates of mortality were also noted in the current analysis—the receipt
of instrumental support and the state of childlessness.
The study on which this article is based was made possible by grants from the Israel Ministry of Science and Technology to
the Israel Gerontological Data Center. 相似文献
82.
83.
84.
85.
Shuji Iritani 《Neuropathology》2007,27(6):604-608
The neuropathology of schizophrenia remains obscure despite the fact that many neuropathologists have investigated this area for over 100 years. While remarkable progress has been made in the neuropathological study of neurodegenerative diseases including Alzheimer's disease, progress in studying the neuropathological entity of schizophrenia has not kept pace; the phrase “schizophrenia is the graveyard of neuropathologists” has been stated in the field. Since the 1980s, the morphological or functional abnormalities in the brains of schizophrenia patients have been reported by means of CT or MRI and with advanced functional brain image technology such as positron emission tomography or single photon emission computed tomography. Results from such imaging studies have led to neuropathological examination of the post mortem brains of schizophrenia patients being undertaken again. These neuroimaging studies have influenced the neuropathological investigation of the schizophrenic brain. Not only the classical microscopic observation of neuropathology, but also measurement and statistical analysis using computer imaging software or using immunohistological techniques has been performed. Based on the neuropathological studies of schizophrenia over the last 20 years, it is clear that schizophrenia is not a pure functional disease without organic factors. Reports of neuropathological abnormalities in the post mortem schizophrenic brain indicated they were found in almost all areas of the brain, but there are more reports describing the temporal lobe and frontal lobe compared to those describing other areas of the brain. These observed neuropathological abnormalities are explained rationally by the hypothesis of a neurodevelopmental disorder in this disease. In recent molecular biology studies, several putative candidate genes were reported, and some of these genes might have the function of neurodevelopment or making neuronal networks. It is important to consider together these findings with morphometric studies in neuropathological observation, neuroimaging studies and genome studies to pursue the etiology of schizophrenia from various perspectives. 相似文献
86.
论网络化时代电视教材的重要性 总被引:7,自引:3,他引:4
郭玉军 《中国医学教育技术》2003,17(2):70-72
针对教学实践中重视计算机辅助教学忽视电视教材的倾向,本文通过对网络时代中电视教材的作用和地位的分析,阐述了加强计算机辅助教学的必要性和加强电视教材制作及应用的重要性以及二者间的关系。 相似文献
87.
88.
89.
基于无线网络及条形码技术的图书排架、定位系统 总被引:3,自引:2,他引:1
王海燕 《中华医学图书情报杂志》2005,15(4):50-52
利用无线网络与条形码技术,建立起图书排架、定位系统,可实现图书排架和图书的准确定位.该系统可有效地解决传统管理方法易产生的乱架和死书问题,提高图书借阅效率并降低管理人员的工作强度. 相似文献
90.
H. Condé 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》1992,88(2):233-248
Summary A comprehensive review of the literature on the anatomy, electrophysiology and pharmacology of thesubstantia nigra is presented. A diagram is developed taking into account the interneuronal interactions of neurotransmitters and receptors that control firing rates and neurotransmitter releases. The central features of the diagram are a positive dopaminergic feedforward process and a positive feedback mechanism mediated by extrasynaptic substance P diffusing from striatal terminals to dopaminergic dendrites of thezona compacta neurons. This loop can enhance the transmission of information from thestriatum through thepars reticulata output neurons. The loop is controlled at the level of zona compacta neurons by a negative feedback supported by the dendritic release of dopamine and boosted by pedunculopontine activation mediated by muscarinic receptors. The output of the loop is controlled by two negative feedforward processes, both involving GABAergic striatonigral afferents. Application of the model to pharmacological studies of diverse behaviors including seizures, turning, and conditioned behaviors reveals unforseen relationships and may offer insights into, and directions for, further analysis of the mechanisms and functions involved. 相似文献