Найдено научных статей и публикаций: 3, для научной тематики: Action potential

1.
Balaji W Ghugare, Manish R Ramavat, Manjiri U Joshi and Ramji Singh
- THE HEALTH AGENDA , 2013

Introduction: Sural sensory nerve conduction studies and Soleus H-reflex studies are affected earliest in systemic illness like diabetes mellitus. Age, sex, height and BMI are associated with nerve conduction study variables. Association of Soleus H-reflex study variables including H wave maximum am...

Introduction: Sural sensory nerve conduction studies and Soleus H-reflex studies are affected earliest in systemic illness like diabetes mellitus. Age, sex, height and BMI are associated with nerve conduction study variables. Association of Soleus H-reflex study variables including H wave maximum amplitude and H/M ratio have been rarely explored yet. Aims and objectives: To evaluate the impact of anthropometric measures on sural sensory and soleus H-reflex study variables. Design: A cross sectional study. Material and methods: Fifty healthy participants (47 male and 3 female) with mean age 33.02 years and age range 21-60 years underwent electrophysiological evaluation (sural sensory and soleus H-reflex study). Sural SNAP amplitude, CV, H wave minimum latency, H wave maximum amplitude and H/M ratio values were obtained. Results: Statistically significant correlation (p value <0.05) was observed between age and H wave minimum latency. Statistically non significant (p value >0.05) but fixed trends were observed between anthropometric measures and sural SNAP amplitude or H wave minimum latency. No correlation was observed between anthropometric measures and sural CV or H/M ratio or H wave maximum amplitude. Conclusion: Study concluded that as age advances H wave minimum latency prolongs. There are no significant height, weight, BMI related changes in sural and soleus H-reflex study.

2.
Sukhov V., Nerush V., Orlova L., Vodeneev V.
- Journal of Theoretical Biology , 2011

Action potential is considered to be one of primary responses of a plant to action of various environmental factors. Understanding of plant action potential propagation mechanisms requires experimental investigation as well as a simulation; however, a detailed mathematical model of plant electrical...

Action potential is considered to be one of primary responses of a plant to action of various environmental factors. Understanding of plant action potential propagation mechanisms requires experimental investigation as well as a simulation; however, a detailed mathematical model of plant electrical signal transmission is absent. Here, the mathematical model of action potential propagation in plants has been worked out. The model is a two-dimensional system of excitable cells; each of them is electrically coupled with four neighboring ones. Ion diffusion between excitable cell apoplast areas is also taken into account. The action potential generation in a single cell has been described on the basis of our previous model. The model simulates active and passive signal transmission well enough. It has been used to analyze theoretically the influence of cell to cell electrical conductivity and H+-ATPase activity on the signal transmission in plants. An increase of cell to cell electrical conductivity has been shown to stimulate an increase of the length constant, the action potential propagation velocity and the temperature threshold, while the membrane potential threshold being weakly changed. The growth of H+-ATPase activity has been found to induce to the increase of temperature and membrane potential thresholds and the reduction of the length constant and the action potential propagation velocity.

*J. Theor. Biol., 2011. V. 291. P. 47–55.*

3.
Vladimir Sukhov and Vladimir Vodeneev
- Journal of Membrane Biology , 2009

A mathematical model of action potential (AP) in vascular plants cells has been worked out. The model takes into account actions of plasmalemma ion transport systems (K+, Cl− and Ca2+ channels; H+- and Ca2+-ATPases; 2H+/Cl− symporter; and H+/K+ antiporter), changes of ion concentrations in the cell ...

A mathematical model of action potential (AP) in vascular plants cells has been worked out. The model takes into account actions of plasmalemma ion transport systems (K+, Cl− and Ca2+ channels; H+- and Ca2+-ATPases; 2H+/Cl− symporter; and H+/K+ antiporter), changes of ion concentrations in the cell and in the extracellular space, cytoplasmic and apoplastic buffer capacities and the temperature dependence of active transport systems. The model of AP simulates a stationary level of the membrane potential and ion concentrations, generation of AP induced by electrical stimulation and gradual cooling and the impact of external Ca2+ for AP development. The model supports a hypothesis about participation of H+-ATPase in AP generation.

*J. Membrane Biol., 2009, V. 232. P. 59–67.*