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- W1992836483 abstract "EXTRASYNAPTIC transmission is mediated by the diffusion of transmitters, through the extracellular space (ECS) to receptors on neurons and glia. The threedimensional diffusion of tetramethylammonium (mol. wt 74.1 kDa) was investigated in the isolated rat spinal cord at postnatal days 4–20. The diffusion parameters of the ECS, volume fraction α, tortuosity λ(λ2 = free/apparent diffusion coefficient in tissue) and nonspecific uptake k′, were different in gray and white matter. In both gray and white matter, α decreased with neuronal development and gliogenesis by about 15% while λ significantly increased. Diffusion in gray matter remained isotropic (λ = 1.65), while in white matter it became anisotropic, i.e. easier along the fibers (λ = 1.38) than across the fibers (λ = 1.80). Anisotropy increased in the second postnatal week, during pronounced myelination. In myelinated tissue, preferential diffusion of neuroactive substances occurs along the axons." @default.
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- W1992836483 date "1997-11-01" @default.
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- W1992836483 title "Heterogeneous and anisotropic diffusion in the developing rat spinal cord" @default.
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- W1992836483 doi "https://doi.org/10.1097/00001756-199711100-00022" @default.
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