Results 11 to 20 of about 200,132 (163)
Deracemization By Simultaneous Bio‐oxidative Kinetic Resolution and Stereoinversion [PDF]
Angewandte Chemie International Edition, 2014 AbstractDeracemization, that is, the transformation of a racemate into a single product enantiomer with theoretically 100 % conversion and 100 % ee, is an appealing but also challenging option for asymmetric synthesis. Herein a novel chemo‐enzymatic deracemization concept by a cascade is described: the pathway involves two enantioselective oxidation ...
Schrittwieser, Joerg +11 more
openaire +2 more sources
Frontiers in Bioengineering and Biotechnology, 2021 Xylooligosaccharides (XOS) have gained considerable attention worldwide as prebiotics due to their immune-strengthening activity and beneficial gut bacteria development and can be produced from xylan-rich resources by acid hydrolysis.
Jianglin Zhao +8 more
doaj +1 more source
Study of Factors Affecting the Copper Ore Leaching Process
ChemEngineering, 2023 This paper provides an overview of hydrometallurgical copper extraction studies in which liquid extraction technology has been used with four copper deposits of different compositions.
Aigul Koizhanova +6 more
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Effect of Environmental pH on Mineralization of Anaerobic Iron-Oxidizing Bacteria
Frontiers in Microbiology, 2022 Freshwater lakes are often polluted with various heavy metals in the Anthropocene. The iron-oxidizing microorganisms and their mineralized products can coprecipitate with many heavy metals, including Al, Zn, Cu, Cd, and Cr.
Na Jiang +13 more
doaj +1 more source
One Novel two-step Bio-Oxidation Pretreatment of Arsenic-Containing Gold-Bearing Concentrate
International Journal of Electrochemical Science, 2018 A novel process was developed to markedly increase gold cyanidation performance from an arsenic-containing gold-bearing concentrate. Before cyanidation, a two-step bio-oxidation pretreatment was employed to decrease the arsenic content in the residue and
Ye Zheng +4 more
doaj +1 more source
Metals, 2020 Carbonaceous sulfidic gold ores are commonly double refractory and thus require pretreatment before gold extraction. In this paper, the capacity of pre-bio-oxidation can simultaneously decompose sulfides or deactivate carbonaceous matters (CM) from a ...
Rui Xu +6 more
doaj +1 more source
Transactions of Nonferrous Metals Society of China, 2008 Abstract Oxidation of arsenopyrite with Acidithiobacillus ferrooxidans was studied. The electrochemical results show that arsenopyrite is firstly oxidized to As 2 S 2 at the potential of 0.2−0.3 V (vs SHE) and As 2 S 2 covers the electrode and retards the process continuously.
Tao JIANG +4 more
openaire +1 more source
Toxics, 2022 Biogenic manganese oxides (Bio-MnOx) have attracted considerable attention for removing pharmaceutical contaminants (PhCs) due to their high oxidation capacity and environmental friendliness.
Quanfeng Wang +7 more
doaj +1 more source
Research of the Application of Roasting in the Processing of the Foamy Product of the Process of Bacterial Oxidation of Flotation Concentrate in a Separate Cycle [PDF]
E3S Web of Conferences, 2021 Among the methods of preliminary opening of refractory gold before sorption cyanidation, the technology of bacterial oxidation is widely used today. Although this technology has many advantages, the specialists of most enterprises around the world using ...
Khamidov Rustam +2 more
doaj +1 more source
Frontiers in Microbiology, 2020 Paraquat is a non-selective fast-acting herbicide used to control weeds in agricultural crops. Many years of extensive use has caused environmental pollution and food toxicity.
Jakkapong Thongpitak +2 more
doaj +1 more source