全文获取类型
收费全文 | 1611篇 |
免费 | 78篇 |
国内免费 | 2篇 |
学科分类
医药卫生 | 1691篇 |
出版年
2023年 | 25篇 |
2022年 | 23篇 |
2021年 | 58篇 |
2020年 | 28篇 |
2019年 | 70篇 |
2018年 | 60篇 |
2017年 | 32篇 |
2016年 | 36篇 |
2015年 | 49篇 |
2014年 | 62篇 |
2013年 | 78篇 |
2012年 | 124篇 |
2011年 | 118篇 |
2010年 | 70篇 |
2009年 | 55篇 |
2008年 | 96篇 |
2007年 | 88篇 |
2006年 | 101篇 |
2005年 | 106篇 |
2004年 | 101篇 |
2003年 | 103篇 |
2002年 | 68篇 |
2001年 | 27篇 |
2000年 | 22篇 |
1999年 | 23篇 |
1998年 | 17篇 |
1997年 | 4篇 |
1996年 | 8篇 |
1995年 | 2篇 |
1994年 | 6篇 |
1993年 | 2篇 |
1992年 | 2篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 3篇 |
1988年 | 5篇 |
1987年 | 1篇 |
1985年 | 2篇 |
1983年 | 3篇 |
1980年 | 1篇 |
1977年 | 1篇 |
1974年 | 1篇 |
1966年 | 1篇 |
排序方式: 共有1691条查询结果,搜索用时 15 毫秒
1.
Rory Watson 《British medical journal》2005,331(7526):1163
2.
3.
4.
5.
6.
7.
Cornel AJ McAbee RD Rasgon J Stanich MA Scott TW Coetzee M 《Journal of medical entomology》2003,40(1):36-51
Comparisons of five morphological characters, 12 enzyme electrophoresis profiles, and Wolbachia pipientis infection rates were used to characterize populations of members of the Culex pipiens L. complex in California and South Africa. In South Africa, male phallosome DV/D ratio, male maxillary palp index, branching of siphonal seta 1a, the enzyme locus Mdhp-1, and W. pipientis infection rates proved highly diagnostic for separating Culex quinquefasciatus from Cx. pipiens phenotypes. In Johannesburg, where sympatric members of the Cx. pipiens complex were analyzed as one population, a significant Wahlund Effect was observed in the enzyme loci such as Ao, 6-Pgdh, Mdh-2, and Pgm. In California, all populations of the Cx. pipiens complex were in Hardy Weinberg equilibrium at all polymorphic enzyme loci examined. Additionally, in California, all populations had similar W. pipientis infection rates and appeared morphologically identical (except for DV/D ratio, in extreme north and south). These findings indicate that in South Africa, Cx. pipiens and Cx. quinquefasciatus remain as genetically distinct populations and behave as separate species. Conversely, in California, there is considerable genetic introgression between Cx. pipiens and Cx. quinquefasciatus, and they behave as a single species. 相似文献
8.
Adam R Clarke Robert J Barry Rory McCarthy Mark Selikowitz Christopher R Brown Rodney J Croft 《International journal of psychophysiology》2003,47(2):129-137
Stimulant medications are the most commonly-used treatments for Attention-Deficit/Hyperactivity Disorder (ADHD) in North America and Australia, although it is still not entirely known how these medications work. This study investigated the effects of stimulant medications on the EEG of children with the Inattentive type of ADHD. An initial EEG was recorded during an eyes-closed resting condition and Fourier transformed to provide absolute and relative power estimates for the delta, theta, alpha and beta bands. Theta/alpha and theta/beta ratios were also calculated. Subjects were placed on a 6-month trial of a stimulant and a second EEG was recorded at the end of the trial. Subjects were included in this study only if they showed a good clinical response during the trial. The unmedicated ADHD group had significantly greater absolute and relative theta, less relative alpha, and higher theta/alpha and theta/beta ratios than the control group. The stimulant medications resulted in a normalisation of the EEG, with changes in the theta, alpha and beta bands being most evident. These results suggest that stimulants act to increase cortical arousal in children with ADHD, normalising their EEG. 相似文献
9.
Mehta Vikram A. Spears Charis A. Abdelgadir Jihad Wang Timothy Y. Sankey Eric W. Griffin Andrew Goodwin C. Rory Zomorodi Ali 《Neurosurgical review》2021,44(4):1933-1941
Neurosurgical Review - Unruptured intracranial saccular aneurysms occur in 3–5% of the general population. As the use of diagnostic medical imaging has steadily increased over the past few... 相似文献
10.