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Digitale Medien

Metallkomplexkatalysatoren mit Phosphonsäureester-Phosphan-Liganden. I. Carbonylierung von Methanol mit Phosphonsäureester-Phosphan-Rhodiumkomplexen in der Flüssigphase (1993)

Freiberg, J. ; Weigt, Axel ; Dilcher, Herbert

New York, NY : Wiley-Blackwell

Journal für Praktische Chemie/Chemiker-Zeitung 335 (1993), S. 337-344

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ISSN: 0941-1216

Schlagwort(e): Chemistry ; Organic Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: Metal Complex Catalysts with Phosphonic Ester Phosphine Ligands. I. Carbonylation of Methanol by Phosphonic Ester Phosphine Rhodium ComplexesThe treatment of technically available 2-(chloroethyl)phosphonic acid dimethylester (1) with diphenylphosphine and potassium-tert.-butylate affords 2-(diphenylphosphino)ethylphosphonic acid dimethylester (2a) in a simple way. 2a can be used as a hemilabil complex ligand (by phosphine and phosphoryl group.) Rhodium complexes of the type (MeO)2P(O)CH2CH2P(Ph)2RhL3 (3) were obtained from 2a and exhibit excellent catalytic properties in the liquid-phase carbonylation of methanol to acetic acid. Studies on other chelat-ligands did not confirm the exceptional increase of the activity by bisphosphinemonoxyd-ligands and the inhibition of the title reaction by bisphosphine-ligands already published.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/prac.19933350406

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Type IV pili promote early biofilm formation by Clostridium difficile (2016)

Maldarelli, G. A., Piepenbrink, K. H., Scott, A. J., Freiberg, J. A., Song, Y., Achermann, Y., Ernst, R. K., Shirtliff, M. E., Sundberg, E. J., Donnenberg, M. S., von Rosenvinge, E. C.

Oxford University Press

In: Pathogens and Disease

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Publikationsdatum: 2016-07-27

Beschreibung: Increasing morbidity and mortality from Clostridium difficile infection (CDI) present an enormous challenge to healthcare systems. Clostridium difficile express type IV pili (T4P), but their function remains unclear. Many chronic and recurrent bacterial infections result from biofilms, surface-associated bacterial communities embedded in an extracellular matrix. CDI may be biofilm mediated; T4P are important for biofilm formation in a number of organisms. We evaluate the role of T4P in C. difficile biofilm formation using RNA sequencing, mutagenesis and complementation of the gene encoding the major pilin pilA1 , and microscopy. RNA sequencing demonstrates that, in comparison to other growth phenotypes, C. difficile growing in a biofilm has a distinct RNA expression profile, with significant differences in T4P gene expression. Microscopy of T4P-expressing and T4P-deficient strains suggests that T4P play an important role in early biofilm formation. A non-piliated pilA1 mutant forms an initial biofilm of significantly reduced mass and thickness in comparison to the wild type. Complementation of the pilA1 mutant strain leads to formation of a biofilm which resembles the wild-type biofilm. These findings suggest that T4P play an important role in early biofilm formation. Novel strategies for confronting biofilm infections are emerging; our data suggest that similar strategies should be investigated in CDI.

Print ISSN: 0928-8244

Thema: Biologie , Medizin

Publiziert von Oxford University Press

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