By Gabriel Landini (auth.), Prof. Dr. Gabriele A. Losa, Prof. Dr. Danilo Merlini, Prof. Dr. Theo F. Nonnenmacher, Prof. Dr. Ewald R. Weibel (eds.)
In March 2000 prime scientists amassed on the Centro Seminariale Monte Verit� , Ascona, Switzerland, for the 3rd foreign Symposium on "Fractals 2000 in Biology and Medicine". This interdisciplinary convention was once held over a four-day interval and supplied stimulating contributions from the very topical box Fractals in Biology and medication. This quantity III within the MBI sequence highlights the transforming into strength and efficacy of the fractal geometry in knowing tips to examine dwelling phenomena and complicated shapes. Many organic gadgets, formerly regarded as hopelessly faraway from any quantitative description, are actually being investigated through fractal equipment. Researchers at present used fractals either as theoretical instruments, to make clear residing structures` self-organization and evolution, and as helpful suggestions, able to quantitatively studying physiological and pathological mobilephone states, shapes and ultrastructures. The booklet will be of curiosity to researchers and scholars from Molecular and C
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Data from table 2. To understand why the equivalent partial pressure difference is found to be only of order 5-10 torr we suggest that one should take care of the cyclic character of the breathing regime. So far, we have essentially considered the case of inspiration where the diffusion source of inspired air is gradually moved towards and into the acinus. During expiration, however, the conditions are different and the acinus Peclet number effect works in the opposite direction to that of inspiration.
These conclusions are general and apply for any structure. In particular, it has been shown that the best specific conductance is of order WI £, which is the ratio of the membrane permeability to the diameter of the alveoli. This suggests that the metabolic rate, proportional to the total oxygen flux, should be simply proportional to the volume of the lung multiplied by this specific conductance. Such a situation appears to be realized during the inspiration regime in exercise condition. A suitable study of the transition between drift and diffusion through the introduction of an "acinus Peclet number" indicates that, in this last situation, the diffusion cell can be approximately considered as working without screening.
Such a situation appears to be realized during the inspiration regime in exercise condition. A suitable study of the transition between drift and diffusion through the introduction of an "acinus Peclet number" indicates that, in this last situation, the diffusion cell can be approximately considered as working without screening. This is confirmed by an allometric analysis of the membrane diffusion conductance and O2 flux in animals of widely varying body size, from mouse to horse, including athletic and sedentary species.
Fractals in Biology and Medicine by Gabriel Landini (auth.), Prof. Dr. Gabriele A. Losa, Prof. Dr. Danilo Merlini, Prof. Dr. Theo F. Nonnenmacher, Prof. Dr. Ewald R. Weibel (eds.)