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Nicholas James Westwood, James Montgomery, Karl Kempf, Daniel Miles-Barrett, Oxana Kempf, Tomas Lebl
The depolymerisation of the biopolymer lignin can give pure aromatic monomers but selective catalytic approaches remain scarce. Here, an approach was re-routed to deliver an unusual phenolic monomer. This monomer's instability proved challenging but a degradation study identified strategies to overcome this. Heterocycles and a useful synthetic intermediate were prepared. The range of aromatics available from the b-O-4 unit in lignin was extended.
September 17, 2018: ChemSusChem
Sytle M Antao, Inayat Dhaliwal
The crystal structure of four Pb apatite samples, Pb5 (BO4 )3 Cl, was refined with synchrotron high-resolution powder X-ray diffraction data, Rietveld refinements, space group P63 /m and Z = 2. For this isotypic series, B = P5+ is pyromorphite, B = As5+ is mimetite and B = V5+ is vanadinite. The ionic radius for As5+ (0.355 Å) is similar to that of V5+ (0.335 Å), and this is twice as large as that for P5+ (0.170 Å). However, the c unit-cell parameter for mimetite is surprisingly different from that of vanadinite, although their unit-cell volumes, V, are almost equal to each other...
January 1, 2018: Journal of Synchrotron Radiation
Fabien J Fuche, Ousmane Sow, Raphael Simon, Sharon M Tennant
Nontyphoidal Salmonella (NTS; i.e., Salmonella enterica organisms that do not cause typhoid or paratyphoid) are responsible for 94 million infections and 155,000 deaths worldwide annually, 86% of which are estimated to be foodborne. Although more than 50 serogroups and 2,600 serovars have been described, not all Salmonella serovars cause disease in humans and animals. Efforts are being made to develop NTS vaccines, with most approaches eliciting protection against serovars Typhimurium and Enteritidis (serogroups B [O:4] and D [O:9], respectively), as they are widely considered the most prevalent...
September 2016: Clinical and Vaccine Immunology: CVI
Fulya Bayındır Bilman, Elçin Günaydın, Mine Turhanoğlu, Ali Akkoç
Colonies of the Salmonella strains usually show a smooth (S) character. Therefore, Salmonella strains producing mucoid colony are very rarely encountered in the literature. Identification of the mucoid Salmonella strains to the species level is difficult via conventional methods, since the mucus layer does not allow the bacterium to respond to the antigenic reactions. In this study we aimed to emphasize the identification of Salmonella serotypes by the polymerase chain reaction (PCR) when rough (R) or mucoid (M) Salmonella isolates are encountered in the laboratory...
January 2014: Mikrobiyoloji Bülteni
Ya-Xi Huang, Jin-You Liu, Jin-Xiao Mi, Jing-Tai Zhao
Gallium boron phosphate, (Ga(0.71)B(0.29))PO(4), was synthesized by a high-temperature solid-state reaction method. The crystal structure is isostructural with the tetra-gonal high-cristobalite structure with space group P which is built from alternating Ga(B)O(4) and PO(4) tetra-hedra inter-connected by sharing the common O-atom vertices, resulting in a three-dimensional structure with two-dimensional six-membered-ring tunnels running along the a and b axes.
2010: Acta Crystallographica. Section E, Structure Reports Online
Sébastien Le Roux, Steve Martin, Randi Christensen, Yang Ren, Valeri Petkov
Experimental structure functions for (Na(2)O)(0.35) [(P(2)O(5))(1 - x)(B(2)O(3))(x)](0.65) glasses, where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0, have been measured by high-energy x-ray diffraction up to wavevectors of 28 Å( - 1) to obtain atomic pair distribution functions with high real space resolution. The experimental diffraction data have been used to guide constrained reverse Monte Carlo simulations of the three-dimensional structure of the glasses. The resulting models show that the glasses exhibit a very complex atomic-scale structure that evolves from an assembly of chains of corner shared P(O)(4) tetrahedra for x = 0 to a network of B(O)(4) tetrahedra and planar B(O)(3) units for x = 1...
January 26, 2011: Journal of Physics. Condensed Matter: An Institute of Physics Journal
Lin-Shu Du, Jonathan F Stebbins
In a series of sodium aluminoborate glasses, we have applied triple-quantum magic-angle spinning (3QMAS) 17O NMR to obtain high-resolution information about the connections among various network structural units, to explore the mixing of aluminum and boron species. Oxygen-17 3QMAS spectra reveal changes in connectivities between AlO4 ([4]Al), AlO5 and AlO6 ([5,6]Al), BO3 ([3]B) and BO4 ([4]B) units, by quantifying populations of bridging oxygens such as Al-O-Al, Al-O-B and B-O-B and of non-bridging oxygens...
January 2005: Solid State Nuclear Magnetic Resonance
M V Raevskaia, N V Koval'chuk, Iu A Belaia
No abstract text is available yet for this article.
June 1994: Biulleten' Eksperimental'noĭ Biologii i Meditsiny
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