scholarly journals Synthesis of shaped Pt nanoparticles using common anions or small molecules as shape-directing agents: observation of a strong halide or pseudo-halide effect

2015 ◽  
Vol 3 (5) ◽  
pp. 2012-2018 ◽  
Author(s):  
Jason A. Michel ◽  
William H. Morris III ◽  
Charles M. Lukehart
Keyword(s):  
Aqueous Solutions ◽  
Small Molecules ◽  
Pt Nanoparticles ◽  
Shape Selectivity ◽  
Colloidal Nanocrystals ◽  
Selection Of

Shape selectivity between cubic and tetrahedral Pt colloidal nanocrystals is achieved simply by selection of [Pt(OH)6]2− or [PtI6]2−, respectively, as the Pt precursor in basic aqueous solutions.

Emerging concepts in pseudoenzyme classification, evolution, and signaling

2019 ◽  
Vol 12 (594) ◽  
pp. eaat9797 ◽  
Author(s):  
António J. M. Ribeiro ◽  
Sayoni Das ◽  
Natalie Dawson ◽  
Rossana Zaru ◽  
Sandra Orchard ◽  
...  
Keyword(s):  
Small Molecules ◽  
A Priori ◽  
Molecular Switches ◽  
Regulatory Mechanisms ◽  
Signaling Networks ◽  
Control Assembly ◽  
Experimental Approaches ◽  
Catch Up ◽  
Enzyme Families ◽  
Selection Of

The 21st century is witnessing an explosive surge in our understanding of pseudoenzyme-driven regulatory mechanisms in biology. Pseudoenzymes are proteins that have sequence homology with enzyme families but that are proven or predicted to lack enzyme activity due to mutations in otherwise conserved catalytic amino acids. The best-studied pseudoenzymes are pseudokinases, although examples from other families are emerging at a rapid rate as experimental approaches catch up with an avalanche of freely available informatics data. Kingdom-wide analysis in prokaryotes, archaea and eukaryotes reveals that between 5 and 10% of proteins that make up enzyme families are pseudoenzymes, with notable expansions and contractions seemingly associated with specific signaling niches. Pseudoenzymes can allosterically activate canonical enzymes, act as scaffolds to control assembly of signaling complexes and their localization, serve as molecular switches, or regulate signaling networks through substrate or enzyme sequestration. Molecular analysis of pseudoenzymes is rapidly advancing knowledge of how they perform noncatalytic functions and is enabling the discovery of unexpected, and previously unappreciated, functions of their intensively studied enzyme counterparts. Notably, upon further examination, some pseudoenzymes have previously unknown enzymatic activities that could not have been predicted a priori. Pseudoenzymes can be targeted and manipulated by small molecules and therefore represent new therapeutic targets (or anti-targets, where intervention should be avoided) in various diseases. In this review, which brings together broad bioinformatics and cell signaling approaches in the field, we highlight a selection of findings relevant to a contemporary understanding of pseudoenzyme-based biology.

Mordanting of mercury on styrene-divinylbenzene copolymer beads from aqueous solutions

2007 ◽  
Vol 95 (5) ◽  
Author(s):  
Nasir Khalid ◽  
Saqib Ali ◽  
Arif Iqbal ◽  
Shujaat Ahmad
Keyword(s):  
Aqueous Solutions ◽  
Contact Time ◽  
Aqueous Media ◽  
Mercury Ions ◽  
Chemical Parameters ◽  
Radiotracer Technique ◽  
Physico Chemical ◽  
Styrene Divinylbenzene ◽  
Selection Of

The sorption of mercury ions from aqueous solutions on styrene-divinylbenzene copolymer beads (St-DVB) has been investigated for the decontamination of mercury from aqueous media. Various physico-chemical parameters, such as selection of appropriate electrolyte, contact time, amount of adsorbent, concentration of adsorbate, effect of diverse ions and temperature were optimized to simulate the best conditions which can be used to decontaminate mercury from aqueous media using St-DVB beads as an adsorbent. The radiotracer technique was used to determine the distribution of mercury. The highest adsorption was observed at 0.001 mol L

Selection of Solvents with A-UNIFAC Applied to Detoxification of Aqueous Solutions

2014 ◽  
Vol 53 (44) ◽  
pp. 17051-17058 ◽  
Author(s):  
José A. Scilipoti ◽  
Martín Cismondi ◽  
Alfonsina E. Andreatta ◽  
Esteban A. Brignole
Keyword(s):  
Aqueous Solutions ◽  
Selection Of

Calculated photoionization cross sections and relative experimental photoionization intensities for a selection of small molecules

1974 ◽  
Vol 61 (2) ◽  
pp. 516-528 ◽  
Author(s):  
J. Wayne Rabalais ◽  
Thomas P. Debies ◽  
Jeffrey L. Berkosky ◽  
Jan‐Tsyu J. Huang ◽  
Frank O. Ellison
Keyword(s):  
Small Molecules ◽  
Cross Sections ◽  
Selection Of
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