Ragnar Rommetveit : His Work and Influence:a Special Issue of mind, Culture, and Activity

This special issue of Mind, Culture, and Activity revisits Rommetveit''s ideas in admiration for his quest to understand meaning, language, and mind. It also reflects the inspiration he has provided for those struggling with these issues. Written by those studying Rommetveit and one by Rommetveit himself, all three articles are attempts to spell out, extend, and apply ideas that Rommetveit outlined in his writings at some point early in his career. Rommetveit, however has moved ahead in his struggle to understand the ethical dimensions of communication--including the communication involved in the study of communication--which represents his newest project.

This dissertation considers various questions with respect to the effects of salinity on nutrification: what are the main inhibiting factors causing the effects, do all salts have similar effects, what is the maximum acceptable salt level, are ammonia oxidisers or nitrite oxidizers most sensitive to salt stress, can nitrifiers adapt to long term salt stress and are some specific nitrifiers more resistant to salt stress than others? Research was carried out at laboratory scale and in full-scale plants and modelling was employed in both phases to provide a mathematical description for salt inhibition on nitrification and to facilitate the comparison. The result has led to an improved understanding of the effect of salinity on nitrification. The results can be used to improve the sustainability of the exisisting wastewater treatment plants operated under salt stress.