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2 gru 2014 · Regulation of the composition and volume of these fluids is important for effective functioning of brain cells and is achieved by barriers that prevent free exchange between CNS and blood and by mechanisms that secrete fluid of controlled composition into the brain and distribute and reabsorb it.
1 cze 2003 · During diffusion times of about 50 ms, water molecules move in the brain over distances of around 10 μm on average, bouncing off, crossing or interacting with many tissue components, such as...
20 mar 2023 · Diffusion-weighted imaging (DWI) is a form of MR imaging based upon measuring the random Brownian motion of water molecules within a voxel of tissue. In general simplified terms, highly cellular tissues or those with cellular swelling exhibit lower diffusion coefficients.
17 paź 2022 · A very recent review provides a comprehensive overview of methods based on the single particle tracking for the optical imaging-enabled diffusion measurement in the brain ECS, as well as technical details of the method’s implementation.
1 lip 2020 · We conclude that convection and diffusion most likely coexist in the brain, but the exact contributions of these two processes likely differ depending on: the experimental condition, arousal state, body position, region of interest, rate and depth of respiration, and more.
17 paź 2022 · In this regard, we outline the relevant new theoretical approaches on transport processes in complex random media such as concepts of diffusive diffusivity and time-dependent homogenization, which expands the understanding of the forms of transport of substances based on diffusion.
18 sty 2011 · Brain capillaries express complex morphology that provide the restrictive characteristics of the endothelial layer with regard to diffusion of solutes; this is an essential feature to protect the brain from unwanted solutes from blood with tight junctions (Tjs) that interconnect adjacent endothelial cells and occlude the paracellular spaces.
