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Full-Text Articles in Life Sciences
Microscopy Of Mixed Surfaces On Layered Semiconductors, L. Margulis, D. Mahalu, B. Parkinson, R. Tenne
Microscopy Of Mixed Surfaces On Layered Semiconductors, L. Margulis, D. Mahalu, B. Parkinson, R. Tenne
Scanning Microscopy
A large number of well-defined hexagonal etch pits is produced on the WSe2 surface by controlled anisotropic corrosion. As a result a mixed surface (combining both ⊥c and ||c components) is created. This surface exhibits photovoltaic properties even better than the atomically smooth van der Waals surface. Measurements of electron beam induced current performed at low temperatures give direct evidence for enhanced current collection of ||c facets. Observations made by transmission electron microscopy and scanning tunneling microscopy show the presence of very low ||c steps on the van der Waals surface.
Effects Of Modulated And Continuous Microwave Irradiation On The Morphology And Cell Surface Negative Charge Of 3t3 Fibroblasts, Z. Somosy, G. Thuróczy, T. Kubasova, J. Kovács, L. D. Szabó
Effects Of Modulated And Continuous Microwave Irradiation On The Morphology And Cell Surface Negative Charge Of 3t3 Fibroblasts, Z. Somosy, G. Thuróczy, T. Kubasova, J. Kovács, L. D. Szabó
Scanning Microscopy
Mouse embryo 3T3 cells were irradiated with 2450 MHz continuous and low frequency (16 Hz) square modulated waves of absorbed energy ranging from 0.0024 to 2.4 mW/g. The low frequency modulated microwave irradiation yielded more morphological cell changes than did the continuous microwave fields of the same intensity. The amount of free negative charges (cationized ferritin binding) on cell surfaces decreased following irradiation by modulated waves but remained unchanged under the effect of a continuous field of the same dose. Modulated waves of 0.024 mW/g dose increased the ruffling activity of the cells, and caused ultrastructural alteration in the cytoplasm. …
Ultrastructure Of Coronary Arterial Endothelium In Atherosclerotic Swine Suggests Lipid Retro-Endocytosis, Keith A. Robinson, Robert P. Apkarian
Ultrastructure Of Coronary Arterial Endothelium In Atherosclerotic Swine Suggests Lipid Retro-Endocytosis, Keith A. Robinson, Robert P. Apkarian
Scanning Microscopy
During experimental atherosclerosis, arterial endothelial cells show characteristic ultrastructural changes including the appearance of increased numbers of plasmalemmal and cytoplasmic vesicles. These structures have been shown by tracer studies to participate in the transcellular transport of low-density lipoprotein cholesterol and β-very-low-density lipoprotein cholesterol from the arterial lumen into the abluminal extracellular matrix. Although this probably represents the major lipid transport pathway, other forms of transport may exist. We document the presence of apparent lipid structures averaging approximately 300 nm in diameter at or near the luminal surface of coronary arterial endothelium of atherosclerotic miniature swine. The structures exhibited a particulate …
Alpha-Particle Irradiation-Induced Change In Bronchopulmonary Macrophage Morphology, In Vitro, T. M. Seed, G. K. Niiro
Alpha-Particle Irradiation-Induced Change In Bronchopulmonary Macrophage Morphology, In Vitro, T. M. Seed, G. K. Niiro
Scanning Microscopy
Bronchopulmonary macrophages, isolated from canine lungs by saline lavage and grown in tissue culture for short periods, were acutely irradiated with a range of doses of either Americium-241 alpha particles (0.03-48 Gy) or 250 keV x-rays (0.5-24 Gy). Following a 24-hour reincubation and "expression" period, cells were examined for radiation-induced changes in overall viability, as well as in cell morphology and ultrastructure. Results indicated that neither quality of radiation had much effect on cell viability over dose ranges examined, but substantial changes in cell volume, surface topography, and cytoplasmic features were noted, especially in the alpha-particle-irradiated specimens. Results support the …