Naturwissenschaften 78 (1991) © Springer-Verlag 1991 been considered as major precursors of humin [l 3]. The classical concepts of the nature of the humin have been questioned over the last few years. Recent studies using l3C NMR spectrometry point to the need of identifying the nature of paraffinic material in the fine soil fractions [4]. The origin of the polymethylene structures in soil humu...

Dimeric quaternary alkylammonium salts possess a favourable surface and antimicrobial activity. In this paper we describe synthesis, spectroscopic analysis, surface and antimicrobial activity as well as biodegradability of polymethylene-α,ω-bis(N,N-dialkyl-N-deoxy-D-glucitolammonium iodides), a new group of dimeric quaternary ammonium salts. This new group of gemini surfactants can be produced ...

nowadays, paying attention to the environmental needs and desires of consumersand trying to satisfy them by designing marketing activities in an environmentallyfriendly way, is the best way to increase their satisfaction and finally, gaincompetitive advantage. prior research has paid much attention to the consumerbehavior and marketing activities of corporate organizations, but none has studied...