Hindered amine light stabilizers

Abstract

A simple charge-discharge circuit model conventionally used to simulate steady-state system metabolism was extended to simulate metabolic responses to perturbations in energy flow rates in balanced benthic marine laboratory microcosms. Empirical determination of the metabolic transfer coefficients using data collected with diel metabolic experiments indicated that these transfer coefficients are a property of the system and not of the environmental conditions to which the system had been acclimated.Used to simulate steady-state metabolic conditions based on various levels of light-energy input and temperature, the model gave values for integrated production and respiration that closely approximated experimental determinations. Moreover, the diel metabolic patterns produced were similar to those observed in the laboratory systems. The model's dynamic behavior upon loss of energy input was similar to that observed in the experimental systems for several days, but diverged after that period. Daytime respiration values were similar in magnitude but different in overall pattern from those observed in the microcosms.Simulations of a series of energy flow rate perturbation experiments produced response curves which were virtually indentical to final steady-state metabolic levels observed in the experiments, and which exhibited initial metabolic transients of the same pattern that had occurred in the laboratory. However, the transient response of the model was of greater amplitude and more highly damped.