期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Dose response and time course of manganeseenhanced magnetic resonance imaging for visual pathway tracing in vivo
1
作者 Wei-ling Wang Hui Xu +3 位作者 Ying Li Zhi-zhong Ma Xiao-dong Sun Yun-tao Hu 《Neural Regeneration Research》 SCIE CAS CSCD 2016年第7期1185-1190,共6页
Axonal tracing is useful for detecting optic nerve injury and regeneration,but many commonly used methods cannot be used to observe axoplasmic flow and synaptic transmission in vivo.Manganese(Mn^2+)-enhanced magnet... Axonal tracing is useful for detecting optic nerve injury and regeneration,but many commonly used methods cannot be used to observe axoplasmic flow and synaptic transmission in vivo.Manganese(Mn^2+)-enhanced magnetic resonance imaging(MEMRI) can be used for in vivo longitudinal tracing of the visual pathway.Here,we explored the dose response and time course of an intravitreal injection of Mn Cl2 for tracing the visual pathway in rabbits in vivo using MEMRI.We found that 2 m M Mn Cl2 enhanced images of the optic nerve but not the lateral geniculate body or superior colliculus,whereas at all other doses tested(5–40 m M),images of the visual pathway from the retina to the contralateral superior colliculus were significantly enhanced.The images were brightest at 24 hours,and then decreased in brightness until the end of the experiment(7 days).No signal enhancement was observed in the visual cortex at any concentration of Mn Cl2.These results suggest that MEMRI is a viable method for temporospatial tracing of the visual pathway in vivo.Signal enhancement in MEMRI depends on the dose of Mn Cl2,and the strongest signals appear 24 hours after intravitreal injection. 展开更多
关键词 tracing detecting optic brightness retina viable synaptic until cortex fitting
下载PDF
Comparing dark matter models,modified Newtonian dynamics and modified gravity in accounting for galaxy rotation curves
2
作者 林昕 唐丽 林海南 《Chinese Physics C》 SCIE CAS CSCD 2017年第5期135-143,共9页
We compare six models(including the baryonic model,two dark matter models,two modified Newtonian dynamics models and one modified gravity model) in accounting for galaxy rotation curves.For the dark matter models,we... We compare six models(including the baryonic model,two dark matter models,two modified Newtonian dynamics models and one modified gravity model) in accounting for galaxy rotation curves.For the dark matter models,we assume NFW profile and core-modified profile for the dark halo,respectively.For the modified Newtonian dynamics models,we discuss Milgrom's MOND theory with two different interpolation functions,the standard and the simple interpolation functions.For the modified gravity,we focus on Moffat's MSTG theory.We fit these models to the observed rotation curves of 9 high-surface brightness and 9 low-surface brightness galaxies.We apply the Bayesian Information Criterion and the Akaike Information Criterion to test the goodness-of-fit of each model.It is found that none of the six models can fit all the galaxy rotation curves well.Two galaxies can be best fitted by the baryonic model without involving nonluminous dark matter.MOND can fit the largest number of galaxies,and only one galaxy can be best fitted by the MSTG model.Core-modified model fits about half the LSB galaxies well,but no HSB galaxies,while the NFW model fits only a small fraction of HSB galaxies but no LSB galaxies.This may imply that the oversimplified NFW and core-modified profiles cannot model the postulated dark matter haloes well. 展开更多
关键词 galaxy galaxies rotation Newtonian gravity interpolation accounting Bayesian brightness fitted
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部