全文获取类型
收费全文 | 368篇 |
免费 | 14篇 |
国内免费 | 7篇 |
出版年
2023年 | 5篇 |
2022年 | 4篇 |
2021年 | 9篇 |
2020年 | 10篇 |
2019年 | 5篇 |
2018年 | 9篇 |
2017年 | 5篇 |
2016年 | 7篇 |
2015年 | 9篇 |
2014年 | 13篇 |
2013年 | 12篇 |
2012年 | 4篇 |
2011年 | 7篇 |
2010年 | 5篇 |
2009年 | 10篇 |
2008年 | 21篇 |
2007年 | 13篇 |
2006年 | 15篇 |
2005年 | 20篇 |
2004年 | 13篇 |
2003年 | 24篇 |
2002年 | 12篇 |
2001年 | 5篇 |
2000年 | 13篇 |
1999年 | 7篇 |
1998年 | 8篇 |
1997年 | 4篇 |
1996年 | 6篇 |
1995年 | 5篇 |
1994年 | 3篇 |
1993年 | 11篇 |
1992年 | 9篇 |
1991年 | 10篇 |
1990年 | 6篇 |
1989年 | 12篇 |
1988年 | 7篇 |
1987年 | 7篇 |
1986年 | 7篇 |
1985年 | 16篇 |
1984年 | 8篇 |
1983年 | 2篇 |
1982年 | 5篇 |
1981年 | 3篇 |
1979年 | 2篇 |
1974年 | 1篇 |
排序方式: 共有389条查询结果,搜索用时 562 毫秒
201.
202.
203.
204.
The present study is part of an ongoing effort to develop a simple diagnostic technology for detecting internal bleeding in the brain, which can be used in lieu or in support of medical imaging and thereby reduce the cost of diagnostics in general, and in particular, would make diagnostics accessible to economically disadvantaged populations. The study deals with a single coil inductive device to be used for detecting cerebral hemorrhage. It presents a first-order experimental study that examines the predictions of our recently published theoretical study. The experimental model employs a homogeneous cylindrical phantom in which internal head bleeding was simulated by way of a fluid inclusion. We measured the changes in amplitude and phase across the coil with a network vector analyzer as a function of frequency (100–1,000 MHz), volume of blood simulating fluid, and the site of the fluid injection. We have developed a new mathematical model to statistically analyze the complex data produced in this experiment. We determined that the resolution for the fluid volume increase following fluid injection is strongly dependent on frequency as well as the location of liquid accumulation. The experimental data obtained in this study supports the predictions of our previous theoretical study, and the statistical analysis shows that the simple single coil device is sensitive enough to detect changes due to fluid volume alteration of two milliliters. Bioelectromagnetics. 2020;41:21–33 © 2019 Bioelectromagnetics Society 相似文献
205.
Khattar SK Bora RS Priyadarsiny P Gupta D Khanna A Narayanan KL Babu V Chugh A Saini KS 《Biotechnology letters》2006,28(2):121-129
cDNAs encoding for five mAChR subtypes (M1–M5) were cloned under different promoters in various eukaryotic vectors and each
subtype was expressed in different mammalian cell lines. CHO-K1 cell line was the best for generating stable cell lines expressing
muscarinic receptors. Immunofluorescence and flow cytometry revealed that expression of M1–M5 was primarily localized on the
cell membrane. Western blotting and radio-ligand binding studies revealed that expression of each receptor was stable at higher
passages.
These authors contributed equally to this work.
Received 22 September 2005; Revisions requested 5 October 2005; Revisions received 2 November 2005; Accepted 4 November 2005 相似文献
206.
Dual reporter genes driven by either a ubiquitous cytomegalovirus (CMV) or a neuro-specific tubulin α1 promoter (Tα1) were
constructed. The new genes, CMV (pCMV-GL) or Tα1 promoter-driven GFP–LacZ (pTα1-GL), robustly expressed the fused GFP–LacZ
protein reporting constitutive expressions in various cell types including CHO cells, loach and chicken embryos, and neuro-specific
expression in differentiating mouse embryonic stem cells, respectively. The dual reporter genes thus provide a versatile tool
for the studies of gene expression, cell lineage within the embryo and possibly the fate of stem cells in transplantation
experiment, thus facilitating different analyses depending on the experimental purposes.
Revisions requested 11 October 2005; Revisions received 25 November 2005 相似文献
207.
208.
209.
210.