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Oxidation of benzoin with anchored vanadyl and
Oxidation of benzoin with anchored vanadyl and

... carried out in the absence of catalyst, was very slow and low yields of benzil were obtained even when the reaction was allowed to proceed for a longer time (up to 32 h). Experiments were carried out using (i) the organic polymer without ligand and metal complex and (ii) the organic polymer function ...
A structural comparison of molybdenum cofactor
A structural comparison of molybdenum cofactor

... families [17], namely the DMSO reductase, xanthine oxidase, sul¢te oxidase, and AOR families. Within each family, sequence similarities are obvious, while no signi¢cant homologies can be detected between members of di¡erent families. This classi¢cation represents a unifying approach in terms of the ...
Nitrate Reductases: Structure, Functions, and Effect of Stress Factors
Nitrate Reductases: Structure, Functions, and Effect of Stress Factors

... been supposed recently that only high-potential clusters are able, for thermodynamic reasons, to transfer electrons, whereas the role of the other two clusters is still unknown. Subunit α (104-150 kD) coded by the narG gene contains the [4Fe-4S] cluster and molybdenum cofactor, just on which the nit ...
Substrate orientation and the origin of catalytic power in xanthine
Substrate orientation and the origin of catalytic power in xanthine

... the reaction (in this case, through to formation of the LMoIVO(SH)(OR) intermediate) decreased by two orders of magnitude from 1.97 × 106 M-1s-1 to 1.34 × 104 M-1s-1. At face value, the effect on kred and Kd is such that the interaction between Glu 232 and substrate provides some 3 kcal/mol of free ...
Reaction of niobium with water
Reaction of niobium with water

... procedure yields 98% pure niobium oxide in one phase and a 99.5% pure tantalum oxide in another. After conversion to the oxide, metallic tantalum can be made by reduction with sodium or carbon. Electrolysis of molten fluorides is also used. ...
Molybdenum Complexes with Amino Acids as
Molybdenum Complexes with Amino Acids as

... solution of Mo(V)chloride (0.2722 g, 1mmol), NaOH 0.1M was added to adjust the pH. The ligand solution of Glutamic acid then was added (3mmol). The resulting mixture was stirred under reflux for 1h and 80°C. The precipitate product was collected by Buchner filtration, washed with water, and dried in ...
File
File

... • At least 25 selenoproteins have been identified, but the metabolic functions have been identified for only about one-half of them ...
Trace Minerals - Pure Encapsulations
Trace Minerals - Pure Encapsulations

... Cellular Function: Many minerals are important enzyme cofactors for numerous processes, including cellular energy production and the synthesis of hormones, neurotransmitters and DNA. This formula provides these trace minerals in a balanced combination, without macro minerals, to promote optimal bioa ...
Purine & Pyrimidine Disorders: Clinical Aspects
Purine & Pyrimidine Disorders: Clinical Aspects

... • Crude form of enzyme replacement therapy ? Possible explanation: inflammatory reaction leading to up-regulation of HPRT gene expression and increase in ...
Molybdenum, Molybdenum in Drinking-water
Molybdenum, Molybdenum in Drinking-water

... out by the International Programme on Chemical Safety, in its Environmental Health Criteria monographs and Concise International Chemical Assessment Documents, the International Agency for Research on Cancer, the Joint FAO/WHO Meetings on Pesticide Residues and the Joint FAO/WHO Expert Committee on ...
Specification Sheet: Alloy 904L
Specification Sheet: Alloy 904L

Chem+174–Lecture+4b+..
Chem+174–Lecture+4b+..

...  Catalytic experiments  The Mo-compounds are tested as catalysts in the air oxidation ...
Lecture 3b - chem.ucla.edu
Lecture 3b - chem.ucla.edu

... Lecture 3b Catalytic Air Oxidation with MoOxdtc2 ...
A1981LW60900001
A1981LW60900001

... marginal lands during the national ploughing-up campaign. I was told to produce effects of all possible nutritional disorders in any chosen crop using sand culture on an unprecedented scale. Being young, inexperienced, and unaware that my senior predecessor had departed at the prospect, I saw no pro ...
1

Molybdenum

Molybdenum is a chemical element with symbol Mo and atomic number 42. The name is from Neo-Latin molybdaenum, from Ancient Greek Μόλυβδος molybdos, meaning lead, since its ores were confused with lead ores. Molybdenum minerals have been known throughout history, but the element was discovered (in the sense of differentiating it as a new entity from the mineral salts of other metals) in 1778 by Carl Wilhelm Scheele. The metal was first isolated in 1781 by Peter Jacob Hjelm.Molybdenum does not occur naturally as a free metal on Earth, but rather in various oxidation states in minerals.The free element, which is a silvery metal with a gray cast, has the sixth-highest melting point of any element. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is in making many types of steel alloys, including high strength alloys and superalloys.Most molybdenum compounds have low solubility in water, but the molybdate ion MoO2−4 is soluble and forms when molybdenum-containing minerals are in contact with oxygen and water. Industrially, molybdenum compounds (about 14% of world production of the element) are used in high-pressure and high-temperature applications, as pigments, and as catalysts.Molybdenum-containing enzymes are by far the most common catalysts used by some bacteria to break the chemical bond in atmospheric molecular nitrogen, allowing biological nitrogen fixation. At least 50 molybdenum-containing enzymes are now known in bacteria and animals, although only bacterial and cyanobacterial enzymes are involved in nitrogen fixation. These nitrogenases contain molybdenum in a different form from the other molybdenum-containing enzymes, which all contain fully oxidized molybdenum incorporated into a molybdenum cofactor. Owing to the diverse functions of the various molybdenum cofactor enzymes, molybdenum is a required element for life in all higher eukaryote organisms, though it is not required by all bacteria.
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