A comparative investigation of the catalytic properties of crystalline aluminosilicates of different types

1982 ◽  
Vol 31 (3) ◽  
pp. 547-552
Author(s):  
V. G. Stepanov ◽  
V. M. Mastikhin ◽  
K. G. Ione
Keyword(s):  
Catalytic Properties ◽  
Comparative Investigation ◽  
Different Types

scholarly journals Controlled growth of ultrafine metal nanoparticles mediated by solid supports

2021 ◽  
Vol 3 (7) ◽  
pp. 1865-1886
Author(s):  
Hongyin Hu ◽  
Shuanglong Lu ◽  
Ting Li ◽  
Yue Zhang ◽  
Chenxi Guo ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Catalytic Properties ◽  
Structural Features ◽  
Controlled Growth ◽  
Solid Supports ◽  
Ultrafine Metal ◽  
Different Types

This article reviews the controlled growth of UMNPs mediated by different types of solid supports and their catalytic properties. The importance of certain structural features of the supports is also discussed.

scholarly journals Purification and properties of glutathione S-transferases from larvae of Wiseana cervinata

1984 ◽  
Vol 217 (1) ◽  
pp. 41-50 ◽  
Author(s):  
A G Clark ◽  
B Drake
Keyword(s):  
Cation Exchange ◽  
Ethacrynic Acid ◽  
Catalytic Properties ◽  
Exchange Chromatography ◽  
Cation Exchange Chromatography ◽  
Purification And Properties ◽  
Different Types ◽  
Glutathione S Transferases ◽  
Physical And Chemical ◽  
Kinetics Of

The glutathione S-transferases from the porina moth, Wiseanna cervinata, were purified by affinity chromatography, cation-exchange chromatography and preparative isoelectrofocusing. The major transferase (IV) was purified to homogeneity by a factor of 530-fold with a yield of 83%. Other transferases present were purified to a smaller degree (approx. 50-fold) to a stage of near-homogeneity. The transferases examined all had Mr values about 45 000-50 000. They appeared to be homodimers of either of two types of subunit, of Mr 22 800 and 24 600. Enzymes consisting of the different types of subunit were not immunologically cross-reactive. The major enzyme fractions separated by cation-exchange chromatography were both active with 1-chloro-2,4-dinitrobenzene, 1,2-dichloro-4-nitrobenzene, ethacrynic acid and iodomethane, but were inactive with 4-nitropyridine N-oxide, 1,2-epoxy-3-(p-nitrophenoxy)propane, bromosulphophthalein and p-nitrobenzyl chloride. The kinetics of the enzyme-catalysed reaction with enzyme IV were non-Michaelean with respect to both substrates. Both products were inhibitory. The results appear to be compatible with a random steady-state mechanism. It is concluded that these enzymes are very similar, in their physical and chemical constitution, in their catalytic properties and in their relationships with each other, to those enzymes that have been isolated from vertebrate organisms.

Comparative investigation of double slope solar still by incorporating different types of collectors: A mini review

2020 ◽  
Author(s):  
Raj Vardhan Patel ◽  
Kiran Bharti ◽  
Gaurav Singh ◽  
Gaurav Mittal ◽  
Desh Bandhu Singh ◽  
...  
Keyword(s):  
Comparative Investigation ◽  
Solar Still ◽  
Different Types

scholarly journals Artificial Heme Enzymes for the Construction of Gold-Based Biomaterials

2018 ◽  
Vol 19 (10) ◽  
pp. 2896 ◽  
Author(s):  
Gerardo Zambrano ◽  
Emmanuel Ruggiero ◽  
Anna Malafronte ◽  
Marco Chino ◽  
Ornella Maglio ◽  
...  
Keyword(s):  
Structural Biology ◽  
Catalytic Properties ◽  
Redox Properties ◽  
Artificial Enzymes ◽  
Heme Enzymes ◽  
Electrode Surfaces ◽  
Heme Enzyme ◽  
Reversible Redox ◽  
Different Types ◽  
Hybrid Biomaterials

Many efforts are continuously devoted to the construction of hybrid biomaterials for specific applications, by immobilizing enzymes on different types of surfaces and/or nanomaterials. In addition, advances in computational, molecular and structural biology have led to a variety of strategies for designing and engineering artificial enzymes with defined catalytic properties. Here, we report the conjugation of an artificial heme enzyme (MIMO) with lipoic acid (LA) as a building block for the development of gold-based biomaterials. We show that the artificial MIMO@LA can be successfully conjugated to gold nanoparticles or immobilized onto gold electrode surfaces, displaying quasi-reversible redox properties and peroxidase activity. The results of this work open interesting perspectives toward the development of new totally-synthetic catalytic biomaterials for application in biotechnology and biomedicine, expanding the range of the biomolecular component aside from traditional native enzymes.

scholarly journals Simple Hybrids Based on Mo or W Oxides and Diamines: Structure Determination and Catalytic Properties

2019 ◽  
Vol 150 (3) ◽  
pp. 713-727 ◽  
Author(s):  
Barbara Bożek ◽  
Patrícia Neves ◽  
Marcin Oszajca ◽  
Anabela A. Valente ◽  
Jan Połtowicz ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Structural Features ◽  
X Ray Diffraction ◽  
One Dimensional ◽  
X Ray ◽  
Water As Solvent ◽  
Phase Oxidation ◽  
Different Types ◽  
Inorganic Precursors ◽  
Catalytic Performances

Abstract Crystalline hybrid catalysts based on molybdenum or tungsten oxide and aliphatic diamines were synthesized via simple, eco-friendly reproducible methodologies, starting from commercially available and relatively inexpensive organic and inorganic precursors, and using water as solvent under mild conditions. The crystal structures of the obtained fine powdered solids were solved ab initio from powder X-ray diffraction data. The type of organic component (1,2-diaminoethane, 1,2-diaminopropane, 1,3-diaminopropane) may play a structure-directing role. On the other hand, different metals (M = Mo, W) may lead to isostructural one-dimensional hybrids of the type MO3(L) with the same bidentate diamine ligand L. The prepared catalysts were investigated for the liquid phase oxidation of saturated and unsaturated hydrocarbons (cis-cyclooctene, cyclooctane), using different types of oxidants (O2, H2O2, tert-butyl hydroperoxide). Differences in catalytic performances associated with distinct structural features were investigated. Graphic Abstract

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