Die analytische Normalität affinoider Ringe

Ohne Zusammenfassung     

Investigation of hormone activity in butterfly imaginal wing discs by protein expression pattern changes

In a proteomic approach using 2-DE, the changes in protein expression patterns in wing imaginal discs induced by hormone treatment have been studied. Here we show the response of butterfly imaginal wing disc tissue taken from late fifth instar larvae of the African-Mocker swallowtail Papilio dardanus (Lepidoptera) to the insect hormones 20-hydroxyecdysone (20-HE) and juvenile hormone (JH). The tissues were cultured in the presence of one hormone or a combination of both and their protein expression was compared to the pattern obtained from untreated wing discs. All the treatments resulted in changes in the expression pattern distinct from the uninduced control, indicating a distinct protein regulation induced by the hormones. The treatment with both of the hormones, which are known to have antagonistic physiological effects, did show a unique pattern, presumably the result, in part, of synergistic effects on protein expression mediated by the combined effects of both the hormones. The extent of the interaction between JH and 20-HE indicates a complex molecular regulation, far beyond a simple antagonistic effect.     

Corrosion inhibited metal pigments

Flake-shaped particles of aluminium are well known in the coatings and printing ink industry as “silver bronze pigments”. For their use in waterborne coatings or outdoor applications, an effective corrosion protection of the highly reactive aluminium surfaces is required. The traditional stabilization techniques for aluminium pigments are based on the addition of corrosion inhibitors or on chromate passivation. This publication presents new developments in the encapsulation of metallic pigments that are based on modern sol-gel techniques. All products are heavy metal-free and provide excellent applicational properties.     

Pyrazolino-diazepines and homodiazepines

1,2-Diazepines 1 undergo various (2π + 4π) as well as (4π + 2π) cycloadditions and lead to bridged adducts 9 and to pyrazolino-diazepines 13 respectively. The elusive 1,7-diazanorcaradiene tautomers 2 could not be trapped through cycloaddition reactions. 1-Pyrazoline 11 as well 2-pyrazo]ine 13a loose a nitrogen molecule by thermal activation and lead to the expected homodiazepines 16 and 17.     

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Ohne ZusammenfassungHerrn Professor Dr. K. Stein zu seinem 60. Geburtstag gewidmet.