Torben Geest

TL;DR: The use of nitrate and nitrite labeled with N was shown to simplify the interpretation of the results when these gases were measured, and the effect of pH on the production of denitrification intermediates from nitrate or nitrite under anoxic conditions was studied.

TL;DR: The first experimental observation of period doubling bifurcations leading to chaos in the PO reaction is presented, showing nonlinear behavior such as bistability and oscillations.

TL;DR: Measurements of photosynthetic activity by monitoring CO2 addition were in excellent agreement with off-line measurements of cell carbon as long as corrections were made for diffusion loss through the walls of the tubing.

TL;DR: In this paper, a universal transition to chaos in the peroxidase-oxyidase (PO) reaction has been found in a simple model of the PO reaction, and the authors have observed period three oscillations under conditions near where chaotic oscillations are found.

TL;DR: In this article, experimental time series of [O 2 ] generated by the peroxidase-oxidases reaction were analyzed using various methods from nonlinear dynamics and the following results were obtained: (1) aperiodic time series are chaotic as evidenced by (i) the observation of period doubling bifurcations in response to increasing the amount of 2,4-dichlorophenol in the reaction mixture, (ii) well-defined next amplitude maps, (iii) positive Lyapunov exponents corresponding to about 0.5 bits per