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首页> 外文期刊>Journal of Encapsulation and Adsorption Sciences >On Damped Wave Diffusion of Oxygen in Pancreatic Islets: Parabolic and Hyperbolic Models
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On Damped Wave Diffusion of Oxygen in Pancreatic Islets: Parabolic and Hyperbolic Models

机译:胰岛中氧气的阻尼波扩散:抛物线和双曲线模型

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Damped wave diffusion effects during oxygen transport in islets of Langerhans is studied. Simultaneous reaction and diffusion models were developed. The asymptotic limits of first and zeroth order in Michaelis and Menten kinetics was used in the study. Parabolic Fick diffusion and hyperbolic damped wave diffusion were studied separately. Method of relativistic transformation was used in order to obtain the solution for the hyperbolic model. Model solutions was used to obtain mass inertial times. Convective boundary condition was used. Sharma number (mass) may be used in evaluating the importance of the damped wave diffusion process in relation to other processes such as convection, Fick steady diffusion in the given application. Four regimes can be identified in the solution of hyperbolic damped wave diffusion model. These are; 1) Zero Transfer Inertial Regime, 0 0≤τ≤τinertia ; 2) Rising Regime during times greater than inertial regime and less than at the wave front, Xp > τ, 3) at Wave front , τ = Xp; 4) Falling Regime in open Interval, of times greater than at the wave front, τ > Xp. Method of superposition of steady state concentration and transient concentration used in both solutions of parabolic and hyperbolic models. Expression for steady state concentration developed. Closed form analytic model solutions developed in asymptotic limits of Michaelis and Menten kinetic at zeroth order and first order. Expression for Penetration Length Derived-Hypoxia Explained. Expression for Inertial Lag Time Derived. Solution was obtained by the method of separation of variables for transient for parabolic model and by the method of relativistic transformation for hyperbolic models. The concentration profile was expressed as a sum of steadty state and transient parts.
机译:研究了在Langerhans的胰岛中氧气传输过程中的阻尼波扩散效应。同时建立了反应和扩散模型。该研究使用了米氏动力学和门腾动力学中一阶和零阶的渐近极限。分别研究了抛物型Fick扩散和双曲型阻尼波扩散。为了获得双曲模型的解,使用了相对论变换的方法。模型解用于获得质量惯性时间。使用对流边界条件。夏尔马数(质量)可用于评估阻尼波扩散过程相对于其他过程(如对流,Fick稳态扩散)的重要性。在双曲阻尼波扩散模型的解中可以确定四种状态。这些是; 1)零转移惯性制度,00≤τ≤τ惯性; 2)在大于惯性范围且小于波前的时期,Xp>τ,3)在波前,τ= Xp; 4)在开放时间间隔内的下降体制,其时间要大于波前的时间,τ> Xp。在抛物线和双曲线模型的解中都使用稳态浓度和瞬态浓度的叠加方法。建立了稳态浓度表达式。在零阶和一阶的Michaelis和Menten动力学的渐近极限中开发的闭式解析模型解决方案。穿透长度衍生性缺氧的表达式得到解释。推导惯性滞后时间的表达式。通过抛物线模型的瞬变变量分离方法和双曲模型的相对论变换方法获得解。浓度曲线表示为稳态和瞬态部分的总和。

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