The present disclosure relates to a hook-type bottom block for a crane, preferably a mobile crane, comprising a lower part to which the hook is fastened in a rotatable and tiltable manner and an upper part in which rollers are supported via which at least one hoist rope can be sheared in. The invention also relates to the use of a hydroxyalkylurea of formula in a composition comprising, in a cosmetically acceptable carrier, at least metal oxide-based mineral pigments, for reducing, or even eliminating, the whitening effect on the keratin material after application. The etalons may be optically coupled together. Subsequently the species can be conveyed away from the interface for further preparation andor analysis. A patient having von Willebrand’s disease is treated by administering factor XIII generally in conjunction with factor VIII concentrate, 1-desamino-8-D-arginine vasopressin or desmopressin.