A material for the erection or renovation of constructions, in particular dykes is disclosed, essentially comprising a surface treatment made from a sand or rock flour and made waterproof by means of a hydrophobic agent. The material is preferably packed in plastic sacks and produced in a mixer, by mixing suitable amounts of sand and/or rock flour with hydrophobic agent.

 
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> Method for producing L-lactic acid

> Genetically modified yeast species and fermenation processes using genetically modified yeast
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