References 1. I. Gelfand, Normierte Ringe, Rec. Math. (Mat. Sbornik) N.S. vol. 9 (1941) pp. 3-24. 2. I. Gelfand and M. Neumark, On the embedding of normed rings into the ring of operators in Hubert Space, Rec. Math. (Mat. Sbornik) N.S. vol. 12 (1943) pp. 197213. 3. L. J. Heider, A note on a theorem of K. G. Wolf son, Proc. Amer. Math. Soc. vol. 6 (1955) pp. 305-308. 4. N. Jacobson, The theory o...

4.2 Microbial Mats, Stromatolites and Their Environments .............................................. 67 4.2.1 What Are Microbial Mats and Stromatolites? Some De fi nitions ...................................................................... 67 4.2.2 Microbial Mats and Stromatolites: The Geological Evidence ............................................... 67 4.2.3 Strati fi cation and Struct...

Quaternary ammonium salts (quats) are an economically advantageous class of industrial compounds. They have surface-active properties, possess anti-microbial activity and are known to be bioactive (Boethling & Lynch, 1992; Juergensen et al., 2000). Contrary, reports regarding low melting tetraalkylphosphonium salts were relatively rare in the literature during the last decades (Bradaric et al.,...