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Articles 91 - 94 of 94
Full-Text Articles in Life Sciences
Vascular "Sphincter" And Microangioarchitecture In The Central Nervous System: Constriction Of Intraparenchymal Blood Vessels Following A Treatment Of Vasoconstrictive Neurotransmitter, K. Nakai, Y. Naka, H. Yokote, T. Ikatura, H. Imai, N. Komai, T. Maeda
Vascular "Sphincter" And Microangioarchitecture In The Central Nervous System: Constriction Of Intraparenchymal Blood Vessels Following A Treatment Of Vasoconstrictive Neurotransmitter, K. Nakai, Y. Naka, H. Yokote, T. Ikatura, H. Imai, N. Komai, T. Maeda
Scanning Microscopy
The site of action of neuropeptide Y (NPY), a potent vasoconstrictive neurotransmitter, on the intraparenchymal blood vessels in the rat parietal cortex was demonstrated using a corrosion cast technique with scanning electron microscopy. Our observations were confined to the cortical area where the regional cerebral blood flow (rCBF) had been reduced significantly by in situ application of NPY. A striking finding in that area was the diffuse narrowing of the perforating arteries in the upper cortical layers. Ring-like compressions on the corrosion casts, presumably formed by active vascular sphincters along the arteries, capillaries and venules within the brain parenchyma, seemed …
Scanning Optical Microscopy Of Semiconductor Materials And Devices, C. J. R. Sheppard
Scanning Optical Microscopy Of Semiconductor Materials And Devices, C. J. R. Sheppard
Scanning Microscopy
In the scanning optical microscope a focused light spot is used to illuminate the object and some property monitored as the spot is scanned relative to the object to build up an image. By monitoring different properties it is thus possible to use the scanning optical microscope in a wide range of imaging modes, which can be used to give much information concerning the structure and properties of semiconductor materials and devices. In the optical-beam induced current method the focused light spot generates electronic carriers in a semiconductor specimen, and the resultant current monitored. The technique can be used to …
The Distribution Of Minnesota Fishes And Late Pleistocene Glaciation, James C. Underhill
The Distribution Of Minnesota Fishes And Late Pleistocene Glaciation, James C. Underhill
Journal of the Minnesota Academy of Science
No abstract provided.
Mercury In Fish From Northeastern Minnesota Lakes: Historical Trends, Environmental Correlates, And Potential Sources, Edward B. Swain, Daniel D. Helwig
Mercury In Fish From Northeastern Minnesota Lakes: Historical Trends, Environmental Correlates, And Potential Sources, Edward B. Swain, Daniel D. Helwig
Journal of the Minnesota Academy of Science
ABSTRACT-High mercury concentrations in fish of some Minnesota lakes and rivers were first noted in 1971. Major anthropogenic sources of mercury to Minnesota rivers generally have been identified and controlled, but it has been difficult to identify mercury sources to remote northeastern Minnesota lakes containing fish with elevated mercury levels. Analysis of sediments from these lakes suggests that mercury deposition has increased by a factor of about 3.5 since white settlement in the state. Because the increase is spatially constant across northeastern Minnesota, atmospheric pollution appears to be responsible for the increase. Given that fish mercury varies considerably among lakes, …