نتایج جستجو برای: axial diffusion
تعداد نتایج: 209231 فیلتر نتایج به سال:
There are limited case reports of structural lesions causing Korsakoff syndrome. This report describes acute Korsakoff syndrome following localized, bilateral infarction of the mammillothalamic tracts (MTTs). Axial T2-weighted imaging revealed the lesions at the lateral wall level of the third ventricle and diffusion-weighted imaging confirmed that the left lesion was new and the right old. Kor...
From the sedimentation and diffusion constant values obtained in a solution containing 1 g./ 100 ml. H substance, and using the determined value of the partial specific volume, the molecular weight was calculated from the usual equation (Svedberg & Pedersen, 1940) giving a value of 320 000. From the same data the frictional ratio f/fo obtained was 4-2. This corresponds to an axial ratio of > 10...
The physical properties of bovine prothrombin preparations have been described in this journal (1). Although methods for obtaining bovine thrombin are now also available (a), the physical properties, including the molecular weight, have not been described. Here we report values for the sedimentation coefficient, diffusion coefficient, intrinsic viscosity, frictional ratio, molecular weight, and...
Amyloid imaging studies of presymptomatic familial Alzheimer's disease have revealed the striatum and thalamus to be the earliest sites of amyloid deposition. This study aimed to investigate whether there are associated volume and diffusivity changes in these subcortical structures during the presymptomatic and symptomatic stages of familial Alzheimer's disease. As the thalamus and striatum are...
Plants rely on the conducting vessels of the phloem to transport the products of photosynthesis from the leaves to the roots, or to any other organs, for growth, metabolism, and storage. Transport within the phloem is due to an osmotically-generated pressure gradient and is hence inherently nonlinear. Since convection dominates over diffusion in the main bulk flow, the effects of diffusive tran...
Abstract We review the surface flux transport model for evolution of magnetic patterns on Sun’s surface. Our underlying motivation is to understand model’s prediction polar field (or axial dipole) strength at end solar cycle. The main focus “classical” model: namely, steady axisymmetric profiles differential rotation and meridional flow, uniform supergranular diffusion. Nevertheless, concentrat...
BACKGROUND Olfactory impairment is an early manifestation of Parkinson's disease (PD). Diffusion Tensor Imaging (DTI) and Magnetization Transfer (MT) are two imaging techniques that allow noninvasive detection of microstructural changes in the cerebral white matter. OBJECTIVE To assess white matter alterations associated with olfactory impairment in PD, using a binary imaging approach with DT...
Vitreous fluorophotometry: mathematical analysis of the effect of peripheral leakage on axial scans.
Current instrumentation in vitreous fluorophotometry allows the determination of a fluorescein concentration profile along the optical axis of the eye. Based on an assumption of a uniform blood-retinal barrier permeability, several methods have been used for the determination of the permeability from an axial scan. The assumption of a uniform permeability is not realistic and it has been unknow...
Axial length (AL) is a significant indicator of eyeball development, but reports on the overall status of axial development in congenital cataract (CC) patients and its relationship with patient demographics, such as age, sex, and laterality, are rare. We prospectively investigated the AL of 1,586 patients ≤ 18 years old and undergoing cataract surgery in China from January 2005 to December 201...
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