Forced Oscillations
Mostrando 13-17 de 17 artigos, teses e dissertações.
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13. Diffusion of extracellular K+ can synchronize bursting oscillations in a model islet of Langerhans.
Electrical bursting oscillations of mammalian pancreatic beta-cells are synchronous among cells within an islet. While electrical coupling among cells via gap junctions has been demonstrated, its extent and topology are unclear. The beta-cells also share an extracellular compartment in which oscillations of K+ concentration have been measured (Perez-Armendar
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14. Decoding temporally encoded sensory input by cortical oscillations and thalamic phase comparators
The temporally encoded information obtained by vibrissal touch could be decoded “passively,” involving only input-driven elements, or “actively,” utilizing intrinsically driven oscillators. A previous study suggested that the trigeminal somatosensory system of rats does not obey the bottom-up order of activation predicted by passive decoding. Th
The National Academy of Sciences of the USA.
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15. Frequency dependence of flow resistance in patients with obstructive lung disease
Total respiratory, pulmonary, and chest wall flow resistances were determined by means of forced pressure and flow oscillations (3-9 cps) superimposed upon spontaneous breathing in a group of patients with varying degrees of obstructive lung disease. Increased total respiratory and pulmonary resistances were found, whereas the chest wall resistance was norma
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16. Oscillations and control features in glycolysis: analysis of resonance effects.
We have presented [Termonia, Y. & Ross, J. (1981) Proc. Natl. Acad. Sci. USA 78, 2952-2956] an analysis of glycolysis based on experimental findings. Here, we give an interpretation based on the concepts of efficiency, resonance response, and control features available to highly nonlinear reaction kinetics. The comprehensive model of glycolysis, for which we
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17. Regional alveolar pressure during periodic flow. Dual manifestations of gas inertia.
We measured pressure excursions at the airway opening and at the alveoli (PA) as well as measured the regional distribution of PA during forced oscillations of six excised dog lungs while frequency (f[2-32 Hz]), tidal volume (VT [5-80 ml]), and mean transpulmonary pressure (PL [25, 10, and 6 cm H2O]) were varied. PA's were measured in four alveolar capsules