Distinct binding modes of pesticides affect the phase transition of lysozyme

CrystEngComm ◽  
2021 ◽  
Author(s):  
Han Liu ◽  
Jinli Zhang ◽  
Wei Li
Keyword(s):  
Phase Transition ◽  
Organic Molecules ◽  
Protein Crystallization ◽  
Binding Modes

The aggregation and nucleation of protein in the presence of organic molecules is helpful to disclose the mechanism of protein crystallization. In this work, taking into account the hydrophobicity of...

scholarly journals Adsorption on graphene: flat to edge to end transitions of phenyl hydroquinone

2017 ◽  
Vol 19 (27) ◽  
pp. 17521-17525 ◽  
Author(s):  
Lifu Chen ◽  
Eden E. L. Tanner ◽  
Richard G. Compton
Keyword(s):  
Phase Transition ◽  
Organic Molecules ◽  
Graphene Surface

A concentration driven three-stage phase transition of large organic molecules on the graphene surface is revealed.

scholarly journals Unravelling the origins of ice nucleation on organic crystals

2018 ◽  
Vol 9 (42) ◽  
pp. 8077-8088 ◽  
Author(s):  
Gabriele C. Sosso ◽  
Thomas F. Whale ◽  
Mark A. Holden ◽  
Philipp Pedevilla ◽  
Benjamin J. Murray ◽  
...  
Keyword(s):  
Phase Transition ◽  
Amino Acids ◽  
Organic Molecules ◽  
Ice Nucleation ◽  
Organic Crystals

Organic molecules such as steroids or amino acids form crystals that can facilitate the formation of ice – arguably the most important phase transition on earth.

scholarly journals Pressure-driven phase transition mechanisms revealed by quantum chemistry: l-serine polymorphs

2017 ◽  
Vol 19 (9) ◽  
pp. 6671-6676 ◽  
Author(s):  
Denis A. Rychkov ◽  
Jernej Stare ◽  
Elena V. Boldyreva
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Quantum Chemistry ◽  
Organic Molecules ◽  
Computational Approach ◽  
Small Organic Molecules ◽  
Pressure Driven

The present study delivers a computational approach for the understanding of the mechanism of phase transitions between polymorphs of small organic molecules.

Screening and optimization of protein crystallization conditions through gradual evaporation using a novel crystallization platform

2005 ◽  
Vol 38 (6) ◽  
pp. 988-995 ◽  
Author(s):  
Sameer Talreja ◽  
David Y. Kim ◽  
Amir Y. Mirarefi ◽  
Charles F. Zukoski ◽  
Paul J. A. Kenis
Keyword(s):  
Phase Transition ◽  
High Throughput Screening ◽  
Large Fraction ◽  
Protein Crystallization ◽  
Rapid Screening ◽  
Successful Implementation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wide Range ◽  
Crystallization Conditions

High-throughput screening of a wide range of different conditions is typically required to obtain X-ray quality crystals of proteins for structure–function studies. The outcomes of individual experiments,i.e.the formation of gels, precipitates, microcrystals, or crystals, guide the search for and optimization of conditions resulting in X-ray diffraction quality crystals. Unfortunately, the protein will remain soluble in a large fraction of the experiments. In this paper, an evaporation-based crystallization platform is reported in which droplets containing protein and precipitant are gradually concentrated through evaporation of solvent until the solvent is completely evaporated. A phase transition is thus ensured for each individual crystallization compartment; hence the number of experiments and the amount of precious protein needed to identify suitable crystallization conditions is reduced. The evaporation-based method also allows for rapid screening of different rates of supersaturation, a parameter known to be important for optimization of crystal growth and quality. The successful implementation of this evaporation-based crystallization platform for identification and especially optimization of crystallization conditions is demonstrated using the model proteins of lysozyme and thaumatin.

Probing the Mode of Neurotransmitter Binding to GABA Receptors Using Selectively Fluorinated GABA Analogues

2015 ◽  
Vol 68 (1) ◽  
pp. 23 ◽  
Author(s):  
Nathan Absalom ◽  
Izumi Yamamoto ◽  
David O'Hagan ◽  
Luke Hunter ◽  
Mary Chebib
Keyword(s):  
Gaba Receptors ◽  
Organic Molecules ◽  
Aminobutyric Acid ◽  
Gamma Aminobutyric Acid ◽  
Binding Modes ◽  
Stereoelectronic Effects ◽  
Natural Ligand ◽  
Gaba Analogues ◽  
Gabac Receptors

Stereoselective fluorination is a useful technique for controlling the conformations of organic molecules. This concept has been exploited to create conformationally biased analogues of the neurotransmitter gamma-aminobutyric acid (GABA). Mono- and di-fluorinated GABA analogues are found to adopt different conformations, due to subtle stereoelectronic effects associated with the C–F bond. These conformationally biased GABA analogues exhibit different shape-dependent selectivity patterns towards GABAA, GABAB, and GABAC receptors, providing valuable information on the binding modes of the natural ligand at these medicinally important targets.

High Resolution Replication of Organoclay Surfaces

1982 ◽  
Vol 40 ◽  
pp. 576-577
Author(s):  
W. W. Barker ◽  
W. E. Rigsby ◽  
V. J. Hurst ◽  
W. J. Humphreys
Keyword(s):  
Clay Mineral ◽  
Organic Molecule ◽  
Organic Molecules ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Naturally Occurring ◽  
Silicate Layers ◽  
Mineral Identification

Experimental clay mineral-organic molecule complexes long have been known and some of them have been extensively studied by X-ray diffraction methods. The organic molecules are adsorbed onto the surfaces of the clay minerals, or intercalated between the silicate layers. Natural organo-clays also are widely recognized but generally have not been well characterized. Widely used techniques for clay mineral identification involve treatment of the sample with H2 O2 or other oxidant to destroy any associated organics. This generally simplifies and intensifies the XRD pattern of the clay residue, but helps little with the characterization of the original organoclay. Adequate techniques for the direct observation of synthetic and naturally occurring organoclays are yet to be developed.

Microstructure of laser-irradiated, conducting Kapton polyimide

1995 ◽  
Vol 53 ◽  
pp. 502-503
Author(s):  
D. L. Callahan ◽  
Z. Ball ◽  
H. M. Phillips ◽  
R. Sauerbrey
Keyword(s):  
Electron Microscopy ◽  
Phase Transition ◽  
Transmission Electron Microscopy ◽  
Cross Section ◽  
Film Surface ◽  
Cross Sectional ◽  
General Utility ◽  
Transmission Electron ◽  
Considerable Debate ◽  
Potential Applications

Ultraviolet laser-irradiation can be used to induce an insulator-to-conductor phase transition on the surface of Kapton polyimide. Such structures have potential applications as resistors or conductors for VLSI applications as well as general utility electrodes. Although the percolative nature of the phase transformation has been well-established, there has been little definitive work on the mechanism or extent of transformation. In particular, there has been considerable debate about whether or not the transition is primarily photothermal in nature, as we propose, or photochemical. In this study, cross-sectional optical microscopy and transmission electron microscopy are utilized to characterize the nature of microstructural changes associated with the laser-induced pyrolysis of polyimide.Laser-modified polyimide samples initially 12 μm thick were prepared in cross-section by standard ultramicrotomy. Resulting contraction in parallel to the film surface has led to distortions in apparent magnification. The scale bars shown are calibrated for the direction normal to the film surface only.

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