Abstract: The invention encompasses novel methods for developing a computer model of a mammalian respiratory system. In particular, the models include representations of biological processes associated with obstruction of the respiratory system with constriction of the respiratory system. The invention also encompasses computer models of respiratory systems, methods of simulating respiratory systems and computer systems for simulating respiratory systems.

Abstract: A system (20) and method are disclosed for the self-calibrating, on-line determination of size distribution f(x) and volume fraction ? of a number of particles (P) dispersed in a medium (M) by detecting one or more propagation characteristics of multiply scattered light from the particles (P). The multiply scattered light is re-emitted in response to exposure to a light source (21) configured to provide light at selected wavelengths. The determination includes calculating the isotropic scattering and absorption coefficients for the particles (P) by comparing the incident and detected light to determine a measurement corresponding to the propagation time through the scattering medium (M), and iteratively estimating the size distribution f(x) and volume fraction ? as a function of the coefficients for each of the wavelengths. An estimation approach based on an expected form of the distribution and the mass of the particles is also disclosed.

Abstract: The invention encompasses novel methods for developing a computer model of cholesterol metabolism in an animal. In particular, the models include representations of biological processes associated with both lipid flux and lipoprotein particles. The invention also encompasses computer models of cholesterol metabolism, methods of simulating cholesterol metabolism and computer systems for simulating cholesterol metabolism.