Assessment of dynamic surface leaching of monolithic surface road materials.

Construction materials have to satisfy, among others, health and environment requirements. To check the environmental compatibility of road construction materials, release of hazardous substances into water must be assessed. Literature mostly describes the leaching behaviour of recycled aggregates for potential use in base or sub-base layers of roads.

Surfactant-modified MFI nanosheets: a high capacity anion-exchanger.

Surfactant-Modified MFI-Zeolite Nanosheets (SMZN) were used for the first time as anion-exchangers, in the case of nitrate ion removal. The SMZN material is characterized by high anionic exchange capacity and removal efficiency compared to classical SMZ prepared from clinoptilolite. The SMZN material is easily regenerated and could be probably employed to remove other anionic pollutants.

PepR1, a CcpA-like transcription regulator of Lactobacillus delbrueckii subsp. lactis.

The PepR1 protein from Lactobacillus delbrueckii subsp. lactis DSM 7290 shares extensive homology with catabolite-control proteins from various Gram-positive bacteria. Expression of the subcloned pepR1 gene allowed for partial complementation of a ccpA defect in Staphylococcus xylosus.

Lactobacillus delbrueckii subsp. lactis DSM7290 pepG gene encodes a novel cysteine aminopeptidase.

A number of Escherichia coli clones were isolated from a Lactobacillus delbrueckii subsp. lactis gene library capable of hydrolysing the chromogenic substrate Gly-Ala-beta-naphthylamide (Gly-Ala-beta NA). Some of the recombinant plasmids carried by these clones have been shown to encode the cysteine aminopeptidase gene pepC.