Marine seaweed (Eucheuma sp.) associated strains of Aspergillus flavus and Aspergillus niger were tested for their Cr(VI) tolerance. Both the isolates showed luxuriant growth in different concentrations of Cr(VI), i.e., 25, 50 and 100 ppm. There was no marked variation in the dry weight of control and test isolates, which indicated that both the isolates can tolerate a wide range of hexavalent ...

For commercial applications, specially formulated conversion coating treatments based on chromates and phosphates have been used extensively to prevent rapid Zn dissolution in aerospace, food processing and automobile industries. Chromate coatings are favored due to their barrier and corrosion resistance properties. Chromium deposition is obtained from hexavalent Cr salt baths, which are subjec...

The metal-catalyzed polymerization of simple olefins, such as ethylene and propylene, has been one of the transformational discoveries in chemistry of the 20th century. It is difficult to imagine today’s civilization without ubiquitous plastics, such as polyethylene and related polymers. Although often attributed to Karl Ziegler and Giulio Natta, the winners of the 1963 Nobel Prize in Chemistry...

This contribution deals with the waste from the processes in which raw hide is transformed into leather, as well as with the waste generated during further leather processing and the final waste of leather industry, the worn-out shoes. All this waste, if deposited in the open-air dumps, represents a potential threat to human health, because it contains trivalent chromium (Cr III), which can oxi...

flight. The trip lasted 2.5 h and the kidney was transplanted into ‘D’ after 4 h of cold ischemia at the HVN. During this time, the kidney of ‘C’ remained in cold ischemia until the plane that landed in Granada came back to Barcelona and was transplanted in ‘E’ with 5 h and 15 min of cold ischemia. At 7:30 PM, the transplant was completed and the chain was closed (Fig. 1). The donors of both ho...