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Principles and Practice of PPFM (Practical Program of Forces Modeling)
(Universidade Estadual Paulista (Unesp), 2020-01-10) Manoel Garcia Neto ; Ermias Kebreab ; Animal Nutrition & Environment Modeling Applications Laboratory (ANEMAL) / UC Davis
The PPFM makes it possible to apply, in a practical way, the laws of physics in biology, through the modeling of growth curves and their derivatives (velocity and acceleration). The principle of action allows us to evaluate how much free energy was used to perform useful work (growth expansion), that is, living organisms have their limits of growth (endpoint), while biologically useful work. As with combustion engines, useful work can be offered as deterministic if there are no changes in the energy value over time. However, if energy is time dependent, action must be determined as integral. This allows to evaluate the performance efficiency of the work carried out that makes possible the accumulation of biomass. The action (energy × time) allows to explore concepts of physics, to clarify biological phenomena, offering a common basis for theoretical biological physics in its most fundamental aspects. Thus, the PPFM worksheet allows to present in a practical way, the establishment of the first law of biology, contributing to the evaluation of growth expansion, allowing a new approach, which in a refined way unifies physics to biology, allowing more understanding of the most basic attributes of nature.