Dedicated to Professor Gábor Laurenczy on the occasion of his 65 th birthday in recognition of his numerous achievements in coordination chemistry and homogeneous catalysis with particular emphasis on chemical storage and delivery of molecular hydrogen.
Many effects of polyamines (PAs) are well known in plant developmental processes; however, the significance of their catabolism is not well understood. Copper amine oxidase (CuAO) is involved in the degradation of diamine putrescine (Put). The genotype dependence and time-dependent effects of this enzyme are rarely examined, so this study aims to discover the role of CuAO in tomato genotypes in different stages of seedling development. Exogenously applied L-aminoguanidine (AG), a CuAO inhibitor, was used to decrease the activity of CuAOs. Based on our results, it can be concluded that there is a genotype dependence of Put degradation, and AG treatment caused a long-term shift of PA catabolism by changing the activities of polyamine oxidase (PAO), catalyzing the degradation of higher PAs. Our results demonstrate that the modification of PA catabolism could have long-term results in polyamine metabolism in different tomato genotypes.
Investigations were undertaken to obtain information for use in the development of new heat‐stable polymers. Model silicon‐containing Schiff base and benzimidazole derivatives were synthesized by reaction of p‐(triphenylsilyl)‐benzaldehyde with phenylenediamines. The structure and thermal stability of the products were studied. The reaction of p‐(triphenylsilyl)benzaldehyde and o‐phenylenediamine yielded N‐p‐(triphenylsilyl)benzylidene‐o‐phenylenediamine which readily oxidizes to form 2‐p‐(triphenylsilyl)phenylbenzimidazole. The di‐Schiff bases, which most probably exist in trans‐trans configurations, were obtained from reaction of the aldehyde derivative with m‐ and p‐phenylenediamine. In contrast to similar Schiff bases without silicon, the products are soluble in organic solvents. The good resistance of the di‐Schiff base and benzimidazole derivatives to thermal decomposition suggests that polymers with repeating units of such structures would also be heat‐stable and might possess useful properties.
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