The crystal structure of β-D-glucose

Ferrier, W. G.

doi:10.1107/s0365110x60001588

Cited by 35 publications

(9 citation statements)

References 3 publications

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“… a The volumes used to calculate SLD for Lipid A and LPS headgroups are based on volumes from the crystal structures of sugars [14,23]. Values from H 2 O, D 2 O, Si and SiO 2 have been reported previously [24,25].…”

Section: Methodsmentioning

confidence: 99%

Asymmetric phospholipid: lipopolysaccharide bilayers; a Gram-negative bacterial outer membrane mimic

Clifton

Skoda

Daulton

et al. 2013

J. R. Soc. Interface.

117

156

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The Gram-negative bacterial outer membrane (OM) is a complex and highly asymmetric biological barrier but the small size of bacteria has hindered advances in in vivo examination of membrane dynamics. Thus, model OMs, amenable to physical study, are important sources of data. Here, we present data from asymmetric bilayers which emulate the OM and are formed by a simple two-step approach. The bilayers were deposited on an SiO2 surface by Langmuir–Blodgett deposition of phosphatidylcholine as the inner leaflet and, via Langmuir–Schaefer deposition, an outer leaflet of either Lipid A or Escherichia coli rough lipopolysaccharides (LPS). The membranes were examined using neutron reflectometry (NR) to examine the coverage and mixing of lipids between the bilayer leaflets. NR data showed that in all cases, the initial deposition asymmetry was mostly maintained for more than 16 h. This stability enabled the sizes of the headgroups and bilayer roughness of 1,2-dipalmitoyl-sn-glycero-3-phosphocholine and Lipid A, Rc-LPS and Ra-LPS to be clearly resolved. The results show that rough LPS can be manipulated like phospholipids and used to fabricate advanced asymmetric bacterial membrane models using well-known bilayer deposition techniques. Such models will enable OM dynamics and interactions to be studied under in vivo-like conditions.

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Section: Methodsmentioning

confidence: 99%

Asymmetric phospholipid: lipopolysaccharide bilayers; a Gram-negative bacterial outer membrane mimic

Clifton

Skoda

Daulton

et al. 2013

J. R. Soc. Interface.

117

156

View full text Add to dashboard Cite

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“…60 , À60 or 180 , respectively. Experimental observations in both the solid phase [211,[214][215][216][217]254] and solution [212,213,233] display approximately equal populations of G+ and GÀ conformers, with an almost complete absence of the T conformer. This propensity in glucopyranosides to adopt gauche conformations is known as gauche effect [255, 256 and references therein].…”

Section: -Deoxy-d-ribose and Ribosementioning

confidence: 99%

“…Numerous experimental studies on α-and β-glucopyranosides, both in solid [211,[214][215][216][217]254] and solution phases [262][263][264], have shown that the dihedral angle (O 6 -C 6 -C 5 -O 5 ) displays a preference for GÀ and G+ gauche configurations, which has been attributed to the gauche effect [255]. This feature was exemplified in a statistical analysis of X-ray structures of glucopyranosyl derivatives [265], yielding a rotamer population of 40:0:60 (G+/T/GÀ).…”

Section: -Deoxy-d-ribose and Ribosementioning

confidence: 99%

Microwave Spectroscopy of Biomolecular Building Blocks

Alonso

López

2014

Topics in Current Chemistry

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Microwave spectroscopy, considered as the most definitive gas phase structural probe, is able to distinguish between different conformational structures of a molecule, because they have unique spectroscopic constants and give rise to distinct individual rotational spectra.Previously, application of this technique was limited to molecular specimens possessing appreciable vapor pressures, thus discarding the possibility of studying many other molecules of biological importance, in particular those with high melting points, which had a tendency to undergo thermal reactions, and ultimately degradation, upon heating.Nowadays, the combination of laser ablation with Fourier transform microwave spectroscopy techniques, in supersonic jets, has enabled the gas-phase study of such systems. In this chapter, these techniques, including broadband spectroscopy, as well as results of their application into the study of the conformational panorama and structure of biomolecular building blocks, such as amino acids, nucleic bases, and monosaccharides, are briefly discussed, and with them, the tools for conformational assignation - rotational constants, nuclear quadrupole coupling interaction, and dipole moment.

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“…The Ag/Au ratio affected the geometry (size, shape and surface composition) of the particles. Considering the molecular size of glucose (1 nm of diameter [61]) and Ag (or Au) atoms (atomic radius 0.144 nm), the former is much larger than the latter. Consequently for glucose activation multiatom adsorption sites are needed.…”

Section: The Role Of Agmentioning

confidence: 99%

Bimetallic Ag–Au/SiO2 catalysts: Formation, structure and synergistic activity in glucose oxidation

Benkó

Beck

Frey

et al. 2014

Applied Catalysis A: General

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SiO 2 supported Ag-Au bimetallic catalysts were prepared by sol adsorption method with 10/90, 20/80, 33/67, and 50/50 Ag/Au molar ratios. Reduction of HAuCl 4 in Ag sol resulted in alloyed AgAu colloid particles and that structure remained after calcination and reduction treatment. The alloy structure of the catalysts was confirmed by UV-visible spectroscopy and high resolution transmission electron microscopy. The Au-Ag bimetallic effect and its dependence on the Ag/Au molar ratio was studied in glucose oxidation where synergistic activity increase was observed compared to the Au/SiO 2 reference sample in case of the bimetallic samples with less than Ag/Au=50/50 molar ratio. The Ag/SiO 2 was inactive at the same conditions. The Ag/Au surface atomic ratios -calculated by X-ray photoelectron spectroscopy (XPS) -were slightly higher than in the bulk -determined by prompt gamma activation analysis (PGAA). The higher activity of the bimetallic samples is suggested to be caused by the improved O 2 activating ability provided by Ag sites. The further increase of Ag loading above the optimal concentration may dilute or cover the Au to such an extent that the number of gold ensembles necessary for glucose activation decreases deteriorating the activity.

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The crystal structure of β-D-glucose

Cited by 35 publications

References 3 publications

Asymmetric phospholipid: lipopolysaccharide bilayers; a Gram-negative bacterial outer membrane mimic

Asymmetric phospholipid: lipopolysaccharide bilayers; a Gram-negative bacterial outer membrane mimic

Microwave Spectroscopy of Biomolecular Building Blocks

Bimetallic Ag–Au/SiO2 catalysts: Formation, structure and synergistic activity in glucose oxidation

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