Theoretical Insights into the Nature of Oxidant and Mechanism in the Regioselective Syn -dihydroxylation of an Alkene with a Rieske oxygenase inspired Iron Catalyst

ChemCatChem ◽  
2018 ◽  
Vol 10 (17) ◽  
pp. 3683-3688 ◽  
Author(s):  
Lisa Roy
Keyword(s):  
Iron Catalyst ◽  
Rieske Oxygenase

scholarly journals Further Studies on the 3-Ketosteroid 9α-Hydroxylase of Rhodococcus ruber Chol-4, a Rieske Oxygenase of the Steroid Degradation Pathway

2021 ◽  
Vol 9 (6) ◽  
pp. 1171
Author(s):  
Sara Baldanta ◽  
Juana María Navarro Llorens ◽  
Govinda Guevara
Keyword(s):  
Cholesterol Metabolism ◽  
Genetic Regulation ◽  
Degradation Pathway ◽  
Rhodococcus Ruber ◽  
Promoter Regions ◽  
Steroid Nucleus ◽  
Steroid Substrate ◽  
Fine Regulation ◽  
Rieske Oxygenase ◽  
Steroid Catabolism

The biochemistry and genetics of the bacterial steroid catabolism have been extensively studied during the last years and their findings have been essential to the development of biotechnological applications. For instance, metabolic engineering of the steroid-eater strains has allowed to obtain intermediaries of industrial value. However, there are still some drawbacks that must be overcome, such as the redundancy of the steroid catabolism genes in the genome and a better knowledge of its genetic regulation. KshABs and KstDs are key enzymes involved in the aerobic breakage of the steroid nucleus. Rhodococcus ruber Chol-4 contains three kshAs genes, a single kshB gene and three kstDs genes within its genome. In the present work, the growth of R. ruber ΔkshA strains was evaluated on different steroids substrates; the promoter regions of these genes were analyzed; and their expression was followed by qRT-PCR in both wild type and ksh mutants. Additionally, the transcription level of the kstDs genes was studied in the ksh mutants. The results show that KshA2B and KshA1B are involved in AD metabolism, while KshA3B and KshA1B contribute to the cholesterol metabolism in R. ruber. In the kshA single mutants, expression of the remaining kshA and kstD genes is re-organized to survive on the steroid substrate. These data give insight into the fine regulation of steroid genes when several isoforms are present.

Low Temperature Large Scale CVD Synthesis of Nano Onion-Like Fullerenes

2012 ◽  
Vol 490-495 ◽  
pp. 3211-3214 ◽  
Author(s):  
Lei Shan Chen ◽  
Cun Jing Wang
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Aluminum Hydroxide ◽  
Large Scale ◽  
Iron Catalyst ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Naoh Solution ◽  
Synthesis Reactions

Synthesis reactions were carried out by chemical vapor deposition using iron catalyst supported on aluminum hydroxide at 400 °C and 420 °C, in the presence of argon as carrier gas and acetylene as carbon source. The aluminum hydroxide support was separated by refluxing the samples in 40% NaOH solution for 2 h and 36% HCl solution for 24 h, respectively. The samples were characterized by field-emission scanning electron microscopy, energy dispersive spectroscopy, high-resolution transmission electron microscopy and X-ray diffraction. The results show that carbon nanotubes were the main products at 420 °C, while large scale high purity nano onion-like fullerenes encapsulating Fe3C, with almost uniform sizes ranging from 10-50 nm, were obtained at the low temperature of 400 °C.

AGET ATRP of water-soluble PEGMA: Fast living radical polymerization mediated by iron catalyst

2012 ◽  
Vol 50 (11) ◽  
pp. 2194-2200 ◽  
Author(s):  
Jie Miao ◽  
Weiwei He ◽  
Lifen Zhang ◽  
Yi Wang ◽  
Zhenping Cheng ◽  
...  
Keyword(s):  
Radical Polymerization ◽  
Iron Catalyst ◽  
Living Radical Polymerization ◽  
Water Soluble ◽  
Aget Atrp

Iron catalyst for ammonia synthesis doped with lithium oxide

2009 ◽  
Vol 10 (14) ◽  
pp. 1821-1823 ◽  
Author(s):  
Walerian Arabczyk ◽  
Izabella Jasinska ◽  
Roman Jedrzejewski
Keyword(s):  
Ammonia Synthesis ◽  
Iron Catalyst ◽  
Lithium Oxide
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