Tyrosinase Model Systems Supported by Pyrazolylmethylpyridine Ligands: Electronic and Steric Factors Influencing the Catalytic Activity and Impact of Complex Equilibria in Solution

Surface contamination in the form of discrete colony-forming units is the main source of bacteria associated with meat spoilage. The fate of these bacteria is determined by the microenvironment at the meat-atmosphere interface, where the constraints determine the nature of a developing microflora. Nutrients, water availability and nutrient diffusion are prominent factors influencing microbial activity. While surface growth is most commonly recognized through enumeration studies based on removal of microorganisms, the less-studied phenomenon of movement of bacteria may be of considerable significance. In model systems, Serratia marcescens moves rapidly in intact meat as well as in compacted comminuted meat. The invasion process may depend on specific enzymes rather than the general class of collagenases. Need for more knowledge about factors that control surface microenvironment of meat is apparent.

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Factors Influencing the Formation of Biofilms on Bacilli Model Systems

BioNanoScience ◽

10.1007/s12668-016-0271-4 ◽

2016 ◽

Vol 6 (4) ◽

pp. 571-574

Author(s):

Lan Din ◽

Natalia Rudakova ◽

Margarita Sharipova

Keyword(s):

Model Systems ◽

Factors Influencing

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Factors influencing the catalytic activity of titanium silicalites in selective oxidations

Catalysis Letters ◽

10.1007/bf00764122 ◽

1991 ◽

Vol 8 (2-4) ◽

pp. 237-244 ◽

Cited By ~ 87

Author(s):

D. R. C. Huybrechts ◽

I. Vaesen ◽

H. X. Li ◽

P. A. Jacobs

Keyword(s):

Catalytic Activity ◽

Factors Influencing

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Molecular Insight from DFT Computations and Kinetic Measurements into the Steric Factors Influencing Peptide Bond Hydrolysis Catalyzed by a Dimeric Zr(IV)-Substituted Keggin Type Polyoxometalate

Inorganic Chemistry ◽

10.1021/acs.inorgchem.6b01461 ◽

2016 ◽

Vol 55 (18) ◽

pp. 9316-9328 ◽

Cited By ~ 16

Author(s):

Tzvetan T. Mihaylov ◽

Hong Giang T. Ly ◽

Kristine Pierloot ◽

Tatjana N. Parac-Vogt

Keyword(s):

Peptide Bond ◽

Kinetic Measurements ◽

Dft Computations ◽

Keggin Type ◽

Factors Influencing ◽

Steric Factors

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Operation of Calcium-Birnessite Water-Oxidation Anodes: Interactions of the Catalyst with Phosphate Buffer Anions

Sustainable Energy & Fuels ◽

10.1039/d1se01076j ◽

2021 ◽

Author(s):

Emanuel Ronge ◽

Jonas Ohms ◽

Vladimir Roddatis ◽

Travis Jones ◽

Frederic Sulzmann ◽

...

Keyword(s):

Catalytic Activity ◽

Water Oxidation ◽

Phosphate Buffer ◽

Factors Influencing

Investigating the interfaces between electrolytes and electrocatalysts during electrochemical water oxidation is of great importance for an understanding of the factors influencing catalytic activity and stability. Here, the interaction of...

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Factors Influencing the Measurement of Calcium Concentrations in Biological Fluids by 19F N.M.R. Spectroscopy

Australian Journal of Chemistry ◽

10.1071/ch9940677 ◽

1994 ◽

Vol 47 (4) ◽

pp. 677

Author(s):

GL Mendz

Keyword(s):

Chemical Exchange ◽

Free Acid ◽

Biological Fluids ◽

Model Systems ◽

Free Calcium ◽

Acid Form ◽

Tetraacetic Acid ◽

Factors Influencing ◽

Free Acid Form ◽

Derivatives Of

Fluorinated derivatives of fluorescent calcium probes have been recently used to measure free calcium concentrations in biological fluids by 19F n.m.r. spectroscopy. To measure calcium levels a method utilizes the change in chemical shift experienced by the fluorine resonance of the calcium chelator 1,2-bis(2-amino-5-fluorophenoxy)ethane-N,N,N′,N′- tetraacetic acid upon complexation of cations. The procedure assumes that (A) the fluorinated probe is in equilibrium between the calcium complex and the free acid form; (B) the chemical exchange between different sites has similar effects on the intensities of the observable resonances; and (c) the presence of macromolecules affects equally the intensities of the resonances arising from different complexes. Experiments designed to test these assumptions were carried out in plasma and in model systems containing mixtures of cations and macromolecules. The results indicated that in biological fluids the calcium probe is involved in a multisite equilibrium in which 'invisible' (very broad) peaks affect the equilibrium intensities of the 'observable' peaks. Binding to macromolecules affected differently the intensities of the resonances arising from different complexes in the spectrum of the chelator , and influenced significantly the calculated free calcium concentrations.

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Recent progress in the application of group 1, 2 & 13 metal complexes as catalysts for the ring opening polymerization of cyclic esters

Inorganic Chemistry Frontiers ◽

10.1039/c9qi00855a ◽

2019 ◽

Vol 6 (10) ◽

pp. 2619-2652 ◽

Cited By ~ 15

Author(s):

Jiahao Gao ◽

Dongzhi Zhu ◽

Wenjuan Zhang ◽

Gregory A. Solan ◽

Yanping Ma ◽

...

Keyword(s):

Catalytic Activity ◽

Ring Opening ◽

Recent Progress ◽

Ring Opening Polymerization ◽

Aliphatic Polyesters ◽

Cyclic Esters ◽

Factors Influencing ◽

Polymer Properties ◽

Recent Developments ◽

Group 1

This review focuses on recent developments concerned with the use of well-defined main group complexes as (pre-)catalysts for the ROP of cyclic esters to give aliphatic polyesters; factors influencing catalytic activity, selectivity and polymer properties are all discussed.

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