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One-dimensional diffusion: Validity of various expressions for jump rates
(American Physical Society, 2009-12)
The coverage dependence of the one-dimensional collective diffusion coefficient is analyzed by using the gradient expansion of the local density. The transition probabilities are written as an expansion of the probabilities ...
From free to effective diffusion coefficients in fluorescence correlation spectroscopy experiments
(American Physical Society, 2013-02-13)
Diffusion is one of the main transport processes that occur inside cells determining the spatial and time distribution of relevant action molecules. In most cases these molecules not only diffuse but also interact with ...
Stefan problems for the diffusion-convection equation with temperature-dependent thermal coefficients
(Pergamon-Elsevier Science Ltd, 2021-09)
Different one-phase Stefan problems for a semi-infinite slab are considered, involving a moving phase change material as well as temperature dependent thermal coefficients. Existence of at least one similarity solution is ...
Surface diffusion of k-mers in one-dimensional systems
(Elsevier Science, 2007-01-15)
The surface diffusion of interacting k-mers is studied both through analytical and Monte Carlo simulation methods in one-dimensional systems. Adsorption isotherms, jump diffusion coefficients and collective diffusion ...
Messages diffuse faster than messengers
(National Academy of Sciences, 2006-12)
In many cell-signaling pathways, information is transmitted by the diffusion of messenger molecules. Diffusion coefficients characterize the messenger's spatial range and the characteristic times of signal propagation. ...
Fluorescence correlation spectroscopy experiments to quantify free diffusion coefficients in reaction-diffusion systems: The case of Ca 2 + and its dyes
(American Physical Society, 2017-06)
Many cell signaling pathways involve the diffusion of messengers that bind and unbind to and from intracellular components. Quantifying their net transport rate under different conditions then requires having separate ...
Temperature-dependent diffusion coefficient of oil from different sunflower seeds during extraction with hexane
(Elsevier, 2011-07-17)
Oil extraction from confectionery, oilseed and wild sunflower seeds with n-hexane was investigated by laboratory tests carried out in a stirred batch extractor at several temperatures (40, 50 and 60 °C). The rates of ...
Quantum statistics of classical particles derived from the condition of a free diffusion coefficient
(American Physical Society, 2016-12)
We derive an equation for the current of particles in energy space; particles are subject to a mean-field effective potential that may represent quantum effects. From the assumption that noninteracting particles imply a ...
Diffusion of sodium chloride in meat pork: Influence on its microstructure
(John Wiley & Sons Inc., 2005-12)
The objectives of the work were: a) to determine the diffusion coefficient of NaCl in pork tissue using brine solutions at 4°C and 20°C; b) to establish the effect of NaCl on tissue microstructure. A unidirectional diffusion ...
Osmotic Dehydration of Nectarines: Influence of the Operating Conditions and Determination of the Effective Diffusion Coefficients
(Springer, 2013-10)
The aim of the present work is to study the kinetics of osmotic dehydration of Caldesi nectarines (Prunus persica var. nectarina) evaluating the effect of osmotic solution concentration, type of solute, temperature, ...