نتایج جستجو برای: bioelectric phenomenon
تعداد نتایج: 158864 فیلتر نتایج به سال:
The relationship between epithelial bioelectric events and epithelium-dependent relaxant and contractile responses of airway smooth muscle in response to hyperosmolar and hypo-osmolar solutions was investigated in guinea pig isolated trachea. Tracheae were perfused with normal or nonisosmotic modified Krebs-Henseleit solution while simultaneously monitoring transepithelial potential difference ...
MCAFEE, ROBERT D. AND WILLIAM LOCKE. Effects of certain steroids on bioelectric current of isolated frog skin. Am. J. Physiol. 2044): 797-0oo* I 96 I .--n-methyl-g cu-fluorohydrocortisone and hydrocortisone sodium succinate increase both the rate and duration and, therefore, total quantity of ion transported in the isolated short-circuited frog skin measured over a 24. hour period. The ion tran...
Endogenous bioelectric signaling via changes in cellular resting potential (V mem) is a key regulator of patterning during regeneration and embryogenesis in numerous model systems. Depolarization of V mem has been functionally implicated in dedifferentiation, tumorigenesis, anatomical re-specification, and appendage regeneration. However, no unbiased analyses have been performed to understand g...
A main goal of regenerative medicine is to replace lost or damaged tissues and organs with functional parts of the correct size and shape. But the proliferation of new cells is not sufficient; we will also need to understand how the scale and ultimate form of newly produced tissues are determined. Using the planarian model system, we report that membrane voltage-dependent bioelectric signaling ...
Non-invasive electrocardiographic (ECG) techniques for assessing the electrical activity of selected regions within the cardiac muscle can benefit from suitable positioning of surface electrodes. This positioning is usually guided heuristically and complemented by clinical and experimental studies, but there is a lack of general methods to characterize quantitatively the ability of a given elec...
Reactive oxygen species (ROS) and electric currents modulate regeneration; however, the interplay between biochemical and biophysical signals during regeneration remains poorly understood. We investigate the interactions between redox and bioelectric activities during tail regeneration in Xenopus laevis tadpoles. We show that inhibition of NADPH oxidase-mediated production of ROS, or scavenging...
In this paper we describe modeling, computation, and visualization software tools applied to problems in computational medicine. We focus the application of these software tools on a class of bioelectric eld problems which arise in electrocardiog-raphy and electroencephalography.
conclusions the current study revealed that pregnant females had significantly lower hgs compared with non-pregnant ones. high parity and gravidity and later stage of pregnancy led to significantly lower hgs. higher level of adiposity led to poorer performance of hgs in females. it is recommended to evaluate hgs in antenatal care, which may have diagnostic and prognostic benefits. background ha...
The use of electric fields for signalling and control in liquids is widespread, spanning bioelectric activity in cells to electrical manipulation of microstructures in lab-on-a-chip devices. However, an appropriate tool to resolve the spatio-temporal distribution of electric fields over a large dynamic range has yet to be developed. Here we present a label-free method to image local electric fi...
Silicon-based materials have widespread application as biophysical tools and biomedical devices. Here we introduce a biocompatible and degradable mesostructured form of silicon with multi-scale structural and chemical heterogeneities. The material was synthesized using mesoporous silica as a template through a chemical vapour deposition process. It has an amorphous atomic structure, an ordered ...
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