Mostrando 5,721 - 5,740 Resultados de 79,334 Para Buscar '"matter"', tiempo de consulta: 0.37s Limitar resultados
  1. 5721
    “…BACKGROUND: Whereas structural abnormalities in the cerebellum have been associated with essential tremor (ET), the contribution of vascular disease via white matter hyperintensities (WMHs) and strokes has not been examined. …”
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  2. 5722
  3. 5723
    “…BACKGROUND: Although schizophrenia has been associated with abnormalities in brain anatomy, imaging studies have not fully determined the nature and relative contributions of gray matter (GM) and white matter (WM) disturbances underlying these findings. …”
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  4. 5724
    “…Functional magnetic resonance imaging (fMRI) activation in white matter is controversial. Given that many of the studies that report fMRI activation in white matter used high field MRI systems, we investigated the field strength dependence of sensitivity to white matter fMRI activation. …”
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  5. 5725
    “…The microscopic structure of neuronal tissue is crucial to brain function, with axon diameter, axonal density and myelination directly influencing signal conduction in the white matter. There is increasing evidence that these microstructural properties alter signal in magnetic resonance imaging (MRI) driven by magnetic susceptibility of different compartments (e.g., myelin sheaths and iron-laden cells). …”
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  6. 5726
  7. 5727
  8. 5728
  9. 5729
    “…Here we report that there is extensive degeneration of gray matter oligodendrocytes in the spinal cord of ALS mice before disease onset. …”
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  10. 5730
    “…We hypothesized that several brain areas in CCHS subjects would show increased gray matter volume loss over time. METHODS: We collected high-resolution T1-weighted images twice (four years apart) from 7 CCHS (age at first study, 16.1±2.7 years; 4 males) and 3 control subjects (15.9±2.1 years; 3 males) using a 3.0-Tesla MRI scanner, and evaluated regional gray matter volume changes with voxel-based-morphometry procedures. …”
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  11. 5731
  12. 5732
    “…Patterning of functional soft matters at different length scales is important for diverse research fields including cell biology, tissue engineering and medicinal science and the development of optics and electronics. …”
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  13. 5733
  14. 5734
  15. 5735
    “…Global gray matter (GM) atrophy rates were quantified from magnetic resonance imaging (MRI) over 6- and 12-month intervals in 37 patients with Alzheimer's disease (AD) and 19 controls using: (1) nonlinear registration and integration of Jacobian values, and (2) segmentation and subtraction of serial GM volumes. …”
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  16. 5736
  17. 5737
    “…Samples from a pristine raised peat bog runoff in Austria, the Tannermoor creek, were analysed for their iron linked to natural organic matter (NOM) content. Dissolved organic carbon < 0.45 μm (DOC) was 41–64 mg L(−1), iron 4.4–5.5 mg L(−1). …”
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  18. 5738
  19. 5739
    “…Several cross sectional studies have identified group differences in white matter integrity after initiation of heavy alcohol and marijuana use, however none have explored white matter trajectories in adolescents pre- and post initiation of use, particularly for marijuana users. …”
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  20. 5740
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