Background: HapX and the CCAAT-binding complex (CBC) are the master regulators of fungal iron homeostasis. Results: HapX DNA binding requires previous CBC-DNA complex formation and a 3Ј-flanking GAT motif with variable nucleotide spacing. Conclusion: Combinatorial CBC-HapX DNA recognition allows discrimination of CBC and CBC-HapX targets. Significance: Conservation of functional domains in HapX orthologs suggests a similar DNA-binding code in most fungi.
By applying a pulsed arc-plasma process, Pt nanoparticles were deposited from a Pt cathode onto CeO2 powders to study their structure and catalytic activity for CO oxidation. Highly dispersed uniform metallic Pt crystallites with the size of 2.6 ± 0.7 nm were obtained. Because of the highly dispersed metallic Pt nanoparticles suitable for CO chemisorption, the catalyst prepared by arc-plasma exhibited higher CO oxidation activity than those prepared by conventional wet impregnation. However, the catalyst was deactivated to a larger extent compared to the impregnated catalyst after thermal aging at 900 °C in a stream of 10% H2O in air.
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