Long Distance Electron Transfer at the Metal/Alkanethiol/Ionic Liquid Interface

The rate constants of simple electron transfer (ET) reactions in room temperature ionic liquids (ILs) available now are rather high, typically at the edge of experimental accuracy. To consider ET phenomena in these media in view of theory developed earlier for molecular solvents, it is crucial to provide quantitative comparison of experimental kinetic data for certain reactions. We report this comparison for ferrocene/ferrocenium reaction. The ET distance is fixed by Au surface modification by alkanethiol self-assembled monolayers, which were characterized by in situ scanning tunneling microscopy. The dependence of ln kapp on barrier thickness in the range of ca. 6–20 Å is linear, with a slope typical for the same plots in aqueous media. This result confirms diabatic mode of Fc oxidation at long distance. The data for shorter ET distances point to the adiabatic regime of ET at a bare gold surface, although more detailed computational studies are required to justify this conclusion.

Synagogen-Chöre : ausführbar mit und ohne Orgelbegleitung

ges., arr. und componirt von Albert Mayer und J. Staab

Judenbegräbnisse und Leichenabführung in Leipzig : Historische Studie (Quelle: Leipziger Ratsarchiv, Ttl. LI; Bd. 15 und 87)

Arno Kapp

Der erste Israelit in der Leipziger Kramerinnung

Arno Kapp

An das deutsche Volk! Was wir vorausgesehen, ist eingetroffen. In ihren Sitzungen von gestern und heute ...

Welsch (Projektbearbeiter): Protest gegen die Einführung einer provisorischen Zentralgewalt für Deutschland durch die Deutsche Nationalversammlung nebst namentlicher Aufführung derjenigen Abgeordneten (der Linken), die gegen das betreffende Gesetz stimmten. Erklärung des Abgeordneten Kapp über seinen Austritt aus der Nationalversammlung

Elkan Herz, der Freund und Verwandte Moses Mendelssohns, der Vater der ersten Leipziger liberalen Judengemeinde

Arno Kapp

Leipziger Meßjuden kämpfen um die Gleichberechtigung : nach Quellen des Leipziger Ratsarchives

Arno Kapp

Jüdische Meßmakler und Kleinhändler in Leipzig

Arno Kapp

Binary recombinase systems for high-resolution conditional mutagenesis.

Conditional mutagenesis using Cre recombinase expressed from tissue specific promoters facilitates analyses of gene function and cell lineage tracing. Here, we describe two novel dual-promoter-driven conditional mutagenesis systems designed for greater accuracy and optimal efficiency of recombination. Co-Driver employs a recombinase cascade of Dre and Dre-respondent Cre, which processes loxP-flanked alleles only when both recombinases are expressed in a predetermined temporal sequence. This unique property makes Co-Driver ideal for sequential lineage tracing studies aimed at unraveling the relationships between cellular precursors and mature cell types. Co-InCre was designed for highly efficient intersectional conditional transgenesis. It relies on highly active trans-splicing inteins and promoters with simultaneous transcriptional activity to reconstitute Cre recombinase from two inactive precursor fragments. By generating native Cre, Co-InCre attains recombination rates that exceed all other binary SSR systems evaluated in this study. Both Co-Driver and Co-InCre significantly extend the utility of existing Cre-responsive alleles.