Template polymerization of methacrylic acid along poly(N-acetyliminoethylene) in water. Influence of template architecture

The kinetic study of the photochemical polymerization of methacrylic acid (MAA) in aqueous dilute solution in the presence of poly(N-acetyliminoethylene) (PNAI) oligomers evidenced template features. The process proceeded in two stages, depending on [PNAI]/[MAA]₀ ratio and polymerization duration, two different complexes being formed, both by a “zip” chain-growth mechanism. Computing and transmission electron microscopy data revealed that this aspect is due to the replacing of the initial PNAI template by the newly formed poly(methacrylic acid) daughter polymer, as a result of the structural peculiarities of the latter as a component of the primary complex. Its specific mode of packing in a complex aggregate was considered to be the main reason for the reported behavior. © 1996 John Wiley & Sons, Inc.     

Mitteilungen aus dem Institut für Radiumforschung

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Die Koagulation anorganischer Suspensoide durch Emulsoide

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Kalihinols from two Acanthella cavernosa sponges: inhibitors of bacterial folate biosynthesis

Acanthella spp. sponges have been prolific sources of highly functionalized diterpene antibiotics. Two Acanthella cavernosa sponges were investigated based on the activity of their extracts in a screen designed to detect bacterial folate biosynthesis inhibitors. Bacillus subtilis PY79 strain harboring a lacZ reporter gene fusion to a trimethoprim-responsive promoter (PpanB) was used for the screen. The ability of kalihinols to inhibit bacterial folate biosynthesis was investigated resulting in preliminary structure activity relationships. Eight kalihinol type diterpenes were isolated from two Philippine Acanthella cavernosa specimens including two new 10- and 15-formamido-kalihinol F analogs.