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Showing papers by "Polytechnic University of Valencia published in 1983"


Journal ArticleDOI
TL;DR: The industrial applications of Thiobacilli in respect to the leaching processes that allow the recovery of metals through oxidation and solubilization from low-grade ores are discussed, with special reference to copper and uranium.
Abstract: This review deals with different aspects concerning the genus Thiobacillus as an obligat chemoautotroph able to oxidize reduced anorganic sulphur compounds. There are given the following topics: physiology of the genus (nutritional requirements, enzymatic complexes for sulphur oxidation, energy generation, reductive CO2 assimilation and growing in presence of organic compounds). The ecological significance of Thiobacilli in the sulphur cycle in Nature is presented. The industrial applications of Thiobacilli in respect to the leaching processes that allow the recovery of metals through oxidation and solubilization from low-grade ores are discussed, with special reference to copper and uranium. A critical revision is done of acid mine drainage impact on the environment, and the use of adequate countermeasures is stressed.

6 citations


Journal ArticleDOI
TL;DR: It is suggested that the highly ordered secondary structure of viroid RNA may be responsible for its particular behavior in the ethanol fractionation of nucleic acids.

2 citations


Journal ArticleDOI
TL;DR: In this paper, a microprocessor-based control system is presented for industrial control applications with accurate final positioning control, displacement speed being limited by the maximum available motor torque, where acceleration, maximum speed and deceleration controls, as well as final position control are implemented.

2 citations