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https://www.readbyqxmd.com/read/28742961/solid-solid-phase-transitions-and-t-butyl-and-methyl-group-rotation-in-an-organic-solid-x-ray-diffractometry-differential-scanning-calorimetry-and-solid-state-1h-nuclear-spin-relaxation
#1
Peter A Beckmann, Andrew R McGhie, Arnold L Rheingold, Gilbert J Sloan, Steven T Szewczyk
Using solid state 1H nuclear magnetic resonance (NMR) spin-lattice relaxation experiments, we have investigated the effects of several solid-solid phase transitions on t-butyl group and methyl group rotation in solid 1,3,5-tri-t-butylbenzene. The goal is to relate the dynamics of the t-butyl groups and their constituent methyl groups to properties of the solid determined using single-crystal X-ray diffraction and differential scanning calorimetry (DSC). On cooling, the DSC experiments see a first-order, solid-solid phase transition at either 268 K or 155 K (but not both) depending on thermal history...
July 25, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28742709/prospective-evaluation-of-precision-multimodal-gallbladder-surgery-navigation-virtual-reality-near-infrared-fluorescence-and-x-ray-based-intraoperative-cholangiography
#2
Michele Diana, Luc Soler, Vincent Agnus, Antonio D'Urso, Michel Vix, Bernard Dallemagne, Vanina Faucher, Catherine Roy, Didier Mutter, Jacques Marescaux, Patrick Pessaux
OBJECTIVE: We aimed to prospectively evaluate NIR-C, VR-AR, and x-ray intraoperative cholangiography (IOC) during robotic cholecystectomy. BACKGROUND: Near-infrared cholangiography (NIR-C) provides real-time, radiation-free biliary anatomy enhancement. Three-dimensional virtual reality (VR) biliary anatomy models can be obtained via software manipulation of magnetic resonance cholangiopancreatography, enabling preoperative VR exploration, and intraoperative augmented reality (AR) navigation...
July 24, 2017: Annals of Surgery
https://www.readbyqxmd.com/read/28742347/cationic-and-anionic-impact-on-the-electronic-structure-of-liquid-water
#3
Zhong Yin, Ludger Inhester, Sreevidya Thekku Veedu, Wilson Quevedo, Annette Pietzsch, Philippe Wernet, Gerrit Groenhof, Alexander Foehlisch, Helmut Grubmüller, Simone Agnes Techert
Hydration shells around ions are crucial for many fundamental biological and chemical processes. Their local physico-chemical properties are quite different from bulk water, and hard to probe experimentally. We address this problem by combining soft X-ray spectroscopy using a liquid jet and molecular dynamics (MD) simulations together with ab initio electronic structure calculations to elucidate the water-ion interaction in an MgCl2 solution at the molecular level. Our results reveal that salt ions mainly affect the electronic properties of water molecules in close vicinity and that the oxygen K-edge X-ray emission spectrum of water molecules in the first solvation shell differs significantly from bulk water...
July 25, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28741984/multiple-ct-scans-extend-lifespan-by-delaying-cancer-progression-in-cancer-prone-mice
#4
Jennifer A Lemon, Nghi Phan, Douglas R Boreham
Computed tomography (CT) scans are a routine diagnostic imaging technique that utilize low-energy X rays with an average absorbed dose of approximately 10 mGy per clinical whole-body CT scan. The growing use of CT scans in the clinic has raised concern of increased carcinogenic risk in patients exposed to ionizing radiation from diagnostic procedures. The goal of this study was to better understand cancer risk associated with low-dose exposures from CT scans. Historically, low-dose exposure preceding a larger challenge dose increases tumor latency, but does little to impact tumor frequency in Trp53(+/-) mice...
July 25, 2017: Radiation Research
https://www.readbyqxmd.com/read/28740907/functional-imaging-equivalence-and-proof-of-concept-for-image-guided-adaptive-radiotherapy-with-fixed-gantry-and-rotating-couch
#5
Ilana Feain, Chun-Chien Shieh, Paul White, Ricky O'Brien, Sandra Fisher, William Counter, Peter Lazarakis, David Stewart, Simon Downes, Michael Jackson, Siddhartha Baxi, Brendan Whelan, Kuldeep Makhija, Chen-Yu Huang, Michael Barton, Paul Keall
PURPOSE: The purpose of this article is to present the first imaging experiments to demonstrate the functional equivalence between a conventional rotational gantry and a fixed-beam imaging geometry, and the feasibility of an iterative image-reconstruction technique under gravitational deformation. METHODS AND MATERIALS: Experiments were performed using an Elekta Axesse with Agility MLC and XVI, a custom-built rotating phantom stage, a Catphan QA phantom, and a porcine heart...
October 2016: Advances in Radiation Oncology
https://www.readbyqxmd.com/read/28740399/a-safety-culture-assessment-by-mixed-methods-at-a-public-maternity-and-infant-hospital-in-china
#6
Tita Alissa Listyowardojo, Xiaoling Yan, Stephen Leyshon, Bobbie Ray-Sannerud, Xin Yan Yu, Kai Zheng, Tao Duan
OBJECTIVE: To assess safety culture at a public maternity hospital in Shanghai, China, using a sequential mixed methods approach. The study was part of a bigger study looking at the application of the mixed methods approach to assess safety culture in health care in different organizations and countries. METHODOLOGY: A mixed methods approach was utilized by first distributing the Safety Attitudes Questionnaire measuring six safety culture dimensions and five independent items to all hospital staff (n=1482) working in 18 departments at a single hospital...
2017: Journal of Multidisciplinary Healthcare
https://www.readbyqxmd.com/read/28739417/neutron-tomographic-imaging-of-bone-implant-interface-comparison-with-x-ray-tomography
#7
Hanna Isaksson, Sophie Le Cann, Christina Perdikouri, Mikael J Turunen, Anders Kaestner, Magnus Tägil, Stephen Hall, Erika Tudisco
Metal implants, in e.g. joint replacements, are generally considered to be a success. As mechanical stability is important for the longevity of a prosthesis, the biological reaction of the bone to the mechanical loading conditions after implantation and during remodelling determines its fate. The bone reaction at the implant interface can be studied using high-resolution imaging. However, commonly used X-ray imaging suffers from image artefacts in the close proximity of metal implants, which limit the possibility to closely examine the bone at the bone-implant interface...
July 21, 2017: Bone
https://www.readbyqxmd.com/read/28739409/fabrication-of-au-iii-ion-imprinted-polymer-based-on-thiol-modified-chitosan
#8
M Monier, D A Abdel-Latif
Au(III) ions were selectively extracted from aqueous media using Au(III) ion-imprinted bio-adsorbent based on modified chitosan (Au-CMB). First, 2-mercaptobenzaldehyde-chitosan Schiff base was prepared and interacted with Au(III) ions. The obtained polymeric Au(III) complex was then cross-linked by epichlorohydrin (ECH) before leaching the template Au(III) ions out of the cross-linked matrix. During the synthetic procedures, the obtained chitosan derivatives were characterized by Elemental analysis, FTIR and NMR spectra...
July 21, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28739372/an-improved-and-general-streamlined-phylogenetic-protocol-applied-to-the-fatty-acid-desaturase-family
#9
Matthew Wilding, Matthias Nachtschatt, Robert Speight, Colin Scott
Numerous tools to generate phylogenetic estimates are available, but there is no single protocol that will produce an accurate phylogenetic tree for any dataset. Here, we investigated some of those tools, paying particular attention to different alignment algorithms, in order to produce a phylogeny for the integral membrane fatty acid desaturase (FAD) family. Herein, we report a novel streamlined protocol which utilises peptide pattern recognition (PPR). This protocol can theoretically be applied universally to generate accurate multiple sequence alignments and improve downstream phylogenetic analyses...
July 21, 2017: Molecular Phylogenetics and Evolution
https://www.readbyqxmd.com/read/28738905/visceral-fat-mass-is-it-the-link-between-uric-acid-and-diabetes-risk
#10
Neda Seyed-Sadjadi, Jade Berg, Ayse A Bilgin, Ross Grant
BACKGROUND: Uric acid (UA) has been suggested as a novel risk factor for diabetes. However, its definite role in this prevalent disease is still the subject of much discussion because it is always accompanied with other major risk factors such as obesity and high visceral adiposity. In order to clarify the role of UA in diabetes, this study aimed to investigate the associations between plasma UA and fasting plasma glucose, HbA1c, lipid profile and inflammatory markers after accounting for the contribution of other diabetes risk factors such as BMI and VAT fat mass...
July 24, 2017: Lipids in Health and Disease
https://www.readbyqxmd.com/read/28738658/an-ultrasensitive-chemiluminescence-aptasensor-for-thrombin-detection-based-on-iron-porphyrin-catalyzing-luminescence-desorbed-from-chitosan-modified-magnetic-oxide-graphene-composite
#11
Yuanling Sun, Yanhui Wang, Jianbo Li, Chaofan Ding, Yanna Lin, Weiyan Sun, Chuannan Luo
In this work, an ultrasensitive chemiluminescence (CL) aptasensor was prepared for thrombin detection based on iron porphyrin catalyzing luminol - hydrogen peroxide luminescence under alkaline conditions, and iron porphyrin was desorbed from chitosan modified magnetic oxide graphene composite (CS@Fe3O4@GO). Firstly, CS@Fe3O4@GO was prepared. CS@Fe3O4@GO has advantages of the good biocompatibility and positively charged on its surface of CS, the large specific surface area of GO and the easy separation characteristics of Fe3O4...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738635/microwave-induced-combustion-thermal-and-morphological-aspects-for-understanding-the-mechanism-of-ignition-process-for-analytical-applications
#12
Matheus F Pedrotti, Leticia S F Pereira, Cezar A Bizzi, Jose N G Paniz, Juliano S Barin, Erico M M Flores
In the present work, for the first time a systematic study was performed using an infrared camera and scanning electron microscopy (SEM) coupled to energy dispersive X-ray spectrometry (EDS) to evaluate the mechanisms involved in microwave-induced combustion method, which has been extensively used for sample preparation. Cellulose and glass fiber discs, wetted with the igniter solution (6molL(-1) NH4NO3), were evaluated under microwave field in a monomode system. The temperature of the discs surface was recorded during microwave irradiation and the effect of NH4NO3 concentration and irradiation time on cellulose oxidation was evaluated...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738619/simultaneous-and-sensitive-electrochemical-detection-of-dihydroxybenzene-isomers-with-uio-66-metal-organic-framework-mesoporous-carbon
#13
Min Deng, Shourui Lin, Xiangjie Bo, Liping Guo
The zirconium-based MOF (UiO-66)/mesoporous carbon (MC) composite was synthesized using conventional hydrothermal method for the first time. The surface morphology and structure of UiO-66/MC composite were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). A novel electrochemical sensor based on UiO-66/MC was constructed for simultaneous and sensitive determination of dihydroxybenzene isomers (DBIs) of hydroquinone (HQ), catechol (CT) and resorcinol (RS)...
November 1, 2017: Talanta
https://www.readbyqxmd.com/read/28738291/inflammation-responsive-self-regulated-drug-release-from-ultrathin-hydrogel-coating
#14
Min He, Qian Wang, Zhenqiang Shi, Yi Xie, Weifeng Zhao, Changsheng Zhao
Heterotopic ossification(HO) is a potential severe complication after many biomaterial implanting surgeries, and the inflammation environment caused by the implanting-associated infections is considered as the main nosogenesis. Herein, an inflammation-responsive drug release system was designed by chemically conjugating indometacin (via ester group) onto hydrogel coating to realize local self-regulated drug release to prevent HO. In our strategy, poly(3-mercaptopropyl)trimethoxysilane-co-acrylic acrylate and polyvinyl alcohol (providing anchoring sites for drug molecules) were firstly synthesized and functionalized with ene-groups, then a hydrogel layer was formed and covalently attached onto thiol-modified substrate via thiol-ene click chemistry, followed by grafting indometacin...
July 18, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28738278/well-dispersed-rhenium-nanoparticles-on-three-dimensional-carbon-nanostructures-efficient-catalysts-for-the-reduction-of-aromatic-nitro-compounds
#15
Pitchaimani Veerakumar, Pounraj Thanasekaran, King-Chuen Lin, Shang-Bin Liu
Rhenium nanoparticles (ReNPs) supported on ordered mesoporous carbon (OMC) as a catalyst (Re/OMC) through a solvent-evaporation induced self-assembly (ELSA) method were prepared. The synthesized heterogonous catalyst was fully characterized using X-ray diffraction, field emission transmission electron microscopy, N2 sorption, metal dispersion, thermogravimetric analysis, Raman, Fourier-transform infrared, and X-ray photon spectroscopies. In addition, the catalyst was applied to reduce the aromatic nitro compounds (ANCs) for the first time in aqueous media and the reactions were monitored by following the intensity changes in the UV-vis absorption spectra with respect to time...
July 18, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28738241/annotinolide-f-and-lycoannotines-a-i-further-lycopodium-alkaloids-from-lycopodium-annotinum
#16
Yu Tang, Juan Xiong, Yike Zou, Wei Wang, Chao Huang, Hai-Yan Zhang, Jin-Feng Hu
Seven lycopodine-type (annotinolide F and lycoannotines A-F), two lycodine-type (lycoannotines G and H), and one fawcettimine-type (lycoannotine I) previously undescribed naturally occurring Lycopodium alkaloids together with thirteen known ones were isolated from the whole plant of Lycopodium annotinum. Their structures and absolute configurations were determined by extensive spectroscopic methods, single-crystal X-ray diffraction, chemical transformation, and electronic circular dichroism (ECD) calculations...
July 21, 2017: Phytochemistry
https://www.readbyqxmd.com/read/28737889/application-of-resonance-ionization-mass-spectrometry-for-ultra-trace-analysis-of-technetium
#17
Pascal Schönberg, Christoph Mokry, Jörg Runke, Daniela Schönenbach, Nils Stöbener, Petra Thörle-Pospiech, Norbert Trautmann, Tobias Reich
This work shows the capability of Resonance Ionization Mass Spectrometry (RIMS) for the determination of (99g)Tc at the ultra-trace level. The characterization of the prepared samples by X-Ray Photoelectron Spectroscopy (XPS) and optimization of the RIMS setup for this purpose as well as the application of the RIMS method to a soil sample are presented. (97)Tc was used as a tracer isotope to determine the amount of (99g)Tc in a soil sample with RIMS. With 8.8 · 10(10) atoms (97)Tc as tracer, the concentration of (99g)Tc amounts to 1...
July 24, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28737819/insertion-reactions-of-small-unsaturated-molecules-in-the-n-b-bonds-of-boron-guanidinates
#18
Alberto Ramos, Antonio Antiñolo, Fernando Carrillo-Hermosilla, Rafael Fernández-Galán, María Del Pilar Montero-Rama, Elena Villaseñor, Antonio Rodríguez-Diéguez, Daniel García-Vivó
We report here 1,1- and 1,2-insertion reactions of small unsaturated molecules in the N-B bonds of two boron guanidinates, (Me2N)C(N(i)Pr)2BCy2 (1) and {(i)Pr(H)N}C(N(i)Pr){N(p-(t)Bu-C6H4)}BCy2 (2), and two bisboron guanidinates(2-), {(i)Pr(BCy2)N}C(N(i)Pr){N(p-(t)Bu-C6H4)}BCy2 (3) and {(i)Pr(C8H14B)N}C(N(i)Pr){N(p-Me-C6H4)}BC8H14 (4), the latter being prepared for the first time by double deprotonation of the corresponding guanidine with the 9-borabicyclo[3.3.1]nonane dimer, (H-BC8H14)2. Compounds 1-4 easily insert aromatic isonitriles, XylNC (Xyl = 2,6-Me2-C6H3) and (p-MeO-C6H4)NC, to give the expected diazaboroles 5-12, some of them being structurally characterised by X-ray diffraction...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737797/cation-distribution-dependent-magnetic-properties-in-cocr2-xfexo4-x-0-1-to-0-5-exafs-m%C3%A3-ssbauer-and-magnetic-measurements
#19
D Kumar, A Banerjee, A Mahmoud, Chandana Rath
In this report, we have examined the evolution of the structure and rich magnetic transitions such as a paramagnetic to ferrimagnetic phase transition at the Curie temperature (TC), spiral ordering temperature (TS) and lock-in temperature (TL) observed in the CoCr2O4 spinel multiferroic after substituting Fe. The crystal structure, microstructure and cation distribution among the tetrahedral (A) and octahedral (B) sites in the spinel lattice are characterised by X-ray diffraction, transmission electron microscopy, Extended X-ray Absorption Fine Structure (EXAFS) and Mössbauer spectroscopy...
July 24, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28737072/the-effect-of-metatarsal-padding-on-pain-and-functional-ability-in-metatarsalgia
#20
K Männikkö, J Sahlman
BACKGROUND AND AIMS: Many kinds of insoles and pads are commonly used as a conservative treatment of metatarsalgia. However, earlier studies of insole treatment provide contradictory results, and the natural progression of metatarsalgia is still unknown. The aims of this study were to (1) determine whether simple custom-made metatarsal pad insoles reduce pain and improve functional ability, (2) find out patients' satisfaction with padding treatment, and (3) investigate predisposing factors for metatarsalgia...
March 1, 2017: Scandinavian Journal of Surgery: SJS
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