keyword
MENU ▼
Read by QxMD icon Read
search

Magnetic resonance spectroscopy

keyword
https://www.readbyqxmd.com/read/29044939/synthesis-and-characterization-of-high-quantum-yield-and-oscillator-strength-6-chloro-2-4-cynophenyl-4-phenyl-quinoline-cl-cn-dpq-organic-phosphor-for-solid-state-lighting
#1
Minakshi Ghate, H K Dahule, N Thejo Kalyani, S J Dhoble
A novel blue luminescent 6-chloro-2-(4-cynophenyl) substituted diphenyl quinoline (Cl-CN DPQ) organic phosphor has been synthesized by the acid-catalyzed Friedlander reaction and then characterized to confirm structural, optical and thermal properties. Structural properties of Cl-CN-DPQ were analyzed by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction technique (XRD) and scanning electron microscopy (SEM) and energy dispersive analysis of X-ray (EDAX) spectroscopy...
October 18, 2017: Luminescence: the Journal of Biological and Chemical Luminescence
https://www.readbyqxmd.com/read/29044690/apparent-diffusion-coefficients-of-the-five-major-metabolites-measured-in-the-human-brain-in-vivo-at-3t
#2
Dinesh K Deelchand, Edward J Auerbach, Małgorzata Marjańska
PURPOSE: To measure the apparent diffusion coefficients (ADC) of five main metabolites in the human brain at 3T with PRESS and STEAM, avoiding measurement biases because of cross-terms. Cross-terms arise from interactions between slice-selection and spoiler gradients in the localized spectroscopy sequence and the diffusion gradients. METHODS: Diffusion-weighted spectra were acquired from the prefrontal cortex in five healthy subjects using STEAM (echo time [TE]/mixing time [TM]/pulse repetition time [TR] = 21...
October 17, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29044220/structure-of-melanins-from-the-fungi-ochroconis-lascauxensis-and-ochroconis-anomala-contaminating-rock-art-in-the-lascaux-cave
#3
José Maria De la Rosa, Pedro M Martin-Sanchez, Santiago Sanchez-Cortes, Bernardo Hermosin, Heike Knicker, Cesareo Saiz-Jimenez
Two novel species of the fungal genus Ochroconis, O. lascauxensis and O. anomala have been isolated from the walls of the Lascaux Cave, France. The interest in these fungi and their melanins lies in the formation of black stains on the walls and rock art which threatens the integrity of the paintings. Here we report solid-state cross polarization magic-angle spinning (13)C and (15)N nuclear magnetic resonance (NMR) spectroscopy and surface-enhanced Raman spectroscopy (SERS) of the melanins extracted from the mycelia of O...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29044168/squid-based-detection-of-ultra-low-field-multinuclear-nmr-of-substances-hyperpolarized-using-signal-amplification-by-reversible-exchange
#4
K Buckenmaier, M Rudolph, C Back, T Misztal, U Bommerich, P Fehling, D Koelle, R Kleiner, H A Mayer, K Scheffler, J Bernarding, M Plaumann
Ultra-low-field (ULF) nuclear magnetic resonance (NMR) is a promising spectroscopy method allowing for, e.g., the simultaneous detection of multiple nuclei. To overcome the low signal-to-noise ratio that usually hampers a wider application, we present here an alternative approach to ULF NMR, which makes use of the hyperpolarizing technique signal amplification by reversible exchange (SABRE). In contrast to standard parahydrogen hyperpolarization, SABRE can continuously hyperpolarize 1 H as well as other MR-active nuclei...
October 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29042078/bioactivity-and-fluoride-release-of-strontium-and-fluoride-modified-biodentine
#5
Hazel O Simila, Natalia Karpukhina, Robert G Hill
Biodentine™ is a novel tricalcium silicate based material used both as a coronal dentine replacement and in pulp therapy. Its multiple use in sealing perforations, pulp capping and as a temporary restoration arises from its ability to promote dentine formation and to confer an excellent marginal seal. However, there is still room for improvement of this cement as it lacks the anticariogenic effect typically conferred by fluoride ion release as seen in glass ionomer cement based dental materials. Therefore, this study was conducted to investigate the impact of bioactive glass addition to Biodentine™...
October 14, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/29041865/imaging-outcome-measures-for-progressive-multiple-sclerosis-trials
#6
Marcello Moccia, Nicola de Stefano, Frederik Barkhof
Imaging markers that are reliable, reproducible and sensitive to neurodegenerative changes in progressive multiple sclerosis (MS) can enhance the development of new medications with a neuroprotective mode-of-action. Accordingly, in recent years, a considerable number of imaging biomarkers have been included in phase 2 and 3 clinical trials in primary and secondary progressive MS. Brain lesion count and volume are markers of inflammation and demyelination and are important outcomes even in progressive MS trials...
October 2017: Multiple Sclerosis: Clinical and Laboratory Research
https://www.readbyqxmd.com/read/29040803/synthesis-and-characterization-of-fatty-acid-grafted-chitosan-polymer-and-their-nanomicelles-for-non-viral-gene-delivery-applications
#7
Divya Sharma, Jagdish Singh
The aim of this study was to synthesize and characterize fatty acid-grafted-chitosan (fatty acid-g-CS) polymer and their nanomicelles for using as carriers for gene delivery. CS was hydrophobically modified using saturated fatty acids of increasing fatty acyl chain length. Carbodiimide along with N-hydroxysuccinimide was used for coupling carboxyl group of fatty acids with amine groups of CS. Proton nuclear magnetic resonance and Fourier transform-infrared spectroscopy were used to quantify fatty acyl substitution onto CS backbone...
October 17, 2017: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29039654/a-bottom-up-synthesis-of-vinyl-cellulose-nanosheets-and-their-nanocomposite-hydrogels-with-enhanced-strength
#8
Jianquan Wang, Jiabao Niu, Toshiki Sawada, Ziqiang Shao, Takeshi Serizawa
Usually extracted nanocellulose from natural resources needs modifying before used as effective nanofillers. In the present study, through an enzymatic polymerization of α-D-glucose 1-phosphate from the primer 2-(glucosyloxy)ethyl methacrylate (GEMA), a novel type of two-dimensional methacrylate-containing cellulose nanosheets (CNS) with a thickness of about 6 nm, named as GEMA-CNS, was directly synthesized under a mild condition by a "bottom-up" method. The structure and morphology of GEMA-CNS were characterized by 1H-nuclear magnetic resonance (NMR), matrix-assisted laser desorption/ionization time-of-flight mass spectra (MALDI-TOF MS), Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), transmission electron microscopy (TEM) and atomic force microscopy (AFM)...
October 17, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29039508/transformation-of-liver-cells-by-3-methylcholanthrene-potentiates-oxidative-stress-via-the-downregulation-of-glutathione-synthesis
#9
Sou Hyun Kim, Dahye Yoon, Yun-Hee Lee, Jaewon Lee, Nam Deuk Kim, Suhkmann Kim, Young-Suk Jung
Polycyclic aromatic hydrocarbons (PAHs) are widespread contaminants resulting from the incomplete combustion of organic materials in the environment. The primary concern for the hazardous effect of PAHs is their ability to activate the pathway linked to the aryl hydrocarbon receptor (AhR) and lead to carcinogenesis. While previous research has demonstrated that oxidative stress plays a key role in the AhR-dependent toxic response, the effect of PAHs on the biosynthesis of glutathione (GSH), which is a powerful endogenous antioxidant, has not been extensively investigated...
October 11, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/29039117/in-vivo-dentate-nucleus-gamma-aminobutyric-acid-concentration-in-essential-tremor-vs-controls
#10
Elan D Louis, Nora Hernandez, Jonathan P Dyke, Ruoyun E Ma, Ulrike Dydak
Despite its high prevalence, essential tremor (ET) is among the most poorly understood neurological diseases. The presence and extent of Purkinje cell (PC) loss in ET is the subject of controversy. PCs are a major storehouse of central nervous system gamma-aminobutyric acid (GABA), releasing GABA at the level of the dentate nucleus. It is therefore conceivable that cerebellar dentate nucleus GABA concentration could be an in vivo marker of PC number. We used in vivo (1)H magnetic resonance spectroscopy (MRS) to quantify GABA concentrations in two cerebellar volumes of interest, left and right, which included the dentate nucleus, comparing 45 ET cases to 35 age-matched controls...
October 16, 2017: Cerebellum
https://www.readbyqxmd.com/read/29038657/platelet-derived-chemokine-cxcl7-dimer-preferentially-exists-in-the-glycosaminoglycan-bound-form-implications-for-neutrophil-platelet-crosstalk
#11
Aaron J Brown, Krishna Mohan Sepuru, Kirti V Sawant, Krishna Rajarathnam
Platelet-derived chemokine CXCL7 (also known as NAP-2) plays a crucial role in orchestrating neutrophil recruitment in response to vascular injury. CXCL7 exerts its function by activating the CXC chemokine receptor 2 (CXCR2) receptor and binding sulfated glycosaminoglycans (GAGs) that regulate receptor activity. CXCL7 exists as monomers, dimers, and tetramers, and previous studies have shown that the monomer dominates at lower and the tetramer at higher concentrations. These observations then raise the question: what, if any, is the role of the dimer? In this study, we make a compelling observation that the dimer is actually the favored form in the GAG-bound state...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/29037672/rapid-and-non-invasive-detection-and-imaging-of-the-hydrocolloid-injected-prawns-with-low-field-nmr-and-mri
#12
Min Li, Bin Li, Weijia Zhang
Method development for monitoring economically motivated food adulteration is pivotal for preventing health problems caused by illegal food additives. In this work, low-field nuclear magnetic resonance (LF-NMR) spectroscopy and magnetic resonance imaging (MRI) was applied for the detection and mapping of adulterated prawns injected with different hydrocolloids including gelatin, carrageenan, agar, amorophophallus konjac and xanthan gum. The characteristic T2 fitting curves were obtained which can be used to tell apart adulterated prawns from normal ones...
March 1, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29037448/effects-of-proprotein-convertase-subtilisin-kexin-type-9-pcsk9-inhibition-with-bococizumab-on-lipoprotein-particles-in-hypercholesterolemic-subjects
#13
Hong Wan, Barry Gumbiner, Tenshang Joh, Tom Riel, Chandrasekhar Udata, Philippe Forgues, Pamela D Garzone
PURPOSE: Monoclonal antibody inhibitors of proprotein convertase subtilisin/kexin type 9 (PCSK9) elicit significant reductions in serum LDL-C levels. However, little is known about their effects on lipoprotein particles. The purpose of this analysis was to evaluate the effect of PCSK9 inhibition with bococizumab (RN316/PF-04950615), a humanized monoclonal antibody to PCSK9, on LDL, VLDL, and HDL particle concentration and size in hypercholesterolemic subjects. METHODS: Data from 3 double-blind, placebo-controlled, randomized studies were analyzed...
October 13, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/29036920/evaluation-of-mc3t3-cells-proliferation-and-drug-release-study-from-sodium-hyaluronate-1-4-butanediol-diglycidyl-ether-patterned-gel
#14
Sumi Bang, Dipankar Das, Jiyun Yu, Insup Noh
A pattern gel has been fabricated using sodium hyaluronate (HA) and 1,4-butanediol diglycidyl ether (BDDGE) through the micro-molding technique. The cellular behavior of osteoblast cells (MC3T3) in the presence and absence of dimethyloxalylglycine (DMOG) and sodium borate (NaB) in the pattern gel (HA-BDDGE) has been evaluated for its potential application in bone regeneration. The Fourier transform infrared spectroscopy (FTIR), (13)C-nuclear magnetic resonance spectroscopy ((13)C NMR), and thermogravimetric analysis (TGA) results implied the crosslinking reaction between HA and BDDGE...
October 14, 2017: Nanomaterials
https://www.readbyqxmd.com/read/29036718/glutamatergic-response-to-heat-pain-stress-in-schizophrenia
#15
Joshua Chiappelli, Qiaoyun Shi, Sarah Andrea Wijtenburg, Raimi Quiton, Krista Wisner, Frank Gaston, Priyadurga Kodi, Christopher Gaudiot, Peter Kochunov, Laura M Rowland, Liyi Elliot Hong
Regulation of stress response involves top-down mechanisms of the frontal-limbic glutamatergic system. As schizophrenia is associated with glutamatergic abnormalities, we hypothesized that schizophrenia patients may have abnormal glutamatergic reactivity within the dorsal anterior cingulate cortex (dACC), a key region involved in perception of and reaction to stress. To test this, we developed a somatic stress paradigm involving pseudorandom application of safe but painfully hot stimuli to the forearm of participants while they were undergoing serial proton magnetic resonance spectroscopy to measure changes in glutamate and glutamine levels in the dACC...
September 23, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/29035811/moving-towards-fast-characterization-of-polymorphic-drugs-by-solid-state-nmr-spectroscopy
#16
Rosalynn Quiñones, Robbie J Iuliucci, Grayce Behnke, Ryanne Brown, Deben Shoup, Taylor M Riedel, Christine Plavchak, Brooke E Lininger, Jonathan M Spehar
Solid-state nuclear magnetic resonance (SS-NMR) spectroscopy has become a common technique to study polymorphism in pharmaceutical solids at high-resolution. However, high-throughput application of high resolution SS-NMR spectroscopy is severely limited by the long (1)H spin-lattice relaxation (T1) that is common to solid phase compounds. Here, we demonstrate the use of paramagnetic relaxation reagents such as chromium (III) acetylacetonate (Cr(acac)3) and nickel (II) acetylacetonate (Ni(acac)2) for fast data acquisition by significantly reducing the T1 value for carbamazepine Forms I, II, III, and dihydrate, cimetidine Forms A and B, nabumetone Form I, and acetaminophen Form I polymorphs...
October 3, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/29035276/unctuous-zro2-nanoparticles-with-improved-functional-attributes-as-lubricant-additives
#17
Jorge Espina-Casado, Alfonso Fernández-González, Ángel José Del Reguero-Huerga, Humberto Rodríguez-Solla, Marta Elena Díaz-García, Rosana Badía Laíño
One of the main drawbacks in the application of metal oxide nanoparticles as lubricant additives is their poor stability in organic media, despite the good anti-wear, friction-reducing and high load capacity properties described for these materials. In this work, we present a novel procedure to chemically cap the surface of ZrO2 nanoparticles (ZrO2NPs) with long hydrocarbon chains in order to obtain stable dispersions of ZrO2NPs in non-aqueous media without disrupting their attributes as lubricant additives...
October 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/29034382/environmental-photochemistry-of-dienogest-phototransformation-to-estrogenic-products-and-increased-environmental-persistence-via-reversible-photohydration
#18
Nicholas C Pflug, Madeline K Hankard, Stephanie M Berg, Meghan O'Connor, James B Gloer, Edward P Kolodziej, David M Cwiertny, Kristine H Wammer
Potent trienone and dienone steroid hormones undergo a coupled photohydration (in light)-thermal dehydration (in dark) cycle that ultimately increases their environmental persistence. Here, we studied the photolysis of dienogest, a dienone progestin prescribed as a next-generation oral contraceptive, and used high resolution mass spectrometry and both 1D and 2D nuclear magnetic resonance spectroscopy to identify its phototransformation products. Dienogest undergoes rapid direct photolysis (t1/2 ∼ 1-10 min), forming complex photoproduct mixtures across the pH range examined (pH 2 to 7)...
October 16, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/29032767/metabonomics-uncovers-a-reversible-proatherogenic-lipid-profile-during-infliximab-therapy-of-inflammatory-bowel-disease
#19
Jacob Tveiten Bjerrum, Casper Steenholdt, Mark Ainsworth, Ole Haagen Nielsen, Michelle Ac Reed, Karen Atkins, Ulrich Leonhard Günther, Fuhua Hao, Yulan Wang
BACKGROUND: One-third of inflammatory bowel disease (IBD) patients show no response to infliximab (IFX) induction therapy, and approximately half of patients responding become unresponsive over time. Thus, identification of potential treatment response biomarkers are of great clinical significance. This study employs spectroscopy-based metabolic profiling of serum from patients with IBD treated with IFX and healthy subjects (1) to substantiate the use of spectroscopy as a semi-invasive diagnostic tool, (2) to identify potential biomarkers of treatment response and (3) to characterise the metabolic changes during management of patients with tumour necrosis factor-α inhibitors...
October 16, 2017: BMC Medicine
https://www.readbyqxmd.com/read/29032213/deproteinised-natural-rubber-latex-grafted-poly-dimethylaminoethyl-methacrylate-poly-vinyl-alcohol-blend-membranes-synthesis-properties-and-application
#20
Jayadevan Janisha, Alex Rosamma, Gopalakrishnapanicker Unnikrishnan
Natural rubber latex was initially deproteinised (DNRL) and then subjected to physicochemical modifications to make high functional membranes for drug delivery applications. Initially, DNRL was prepared by incubating with urea, sodiumdodecylsulphate and acetone followed by centrifugation. The deproteinisation was confirmed by CHN analysis. The DNRL was then chemically modified by grafting (dimethylaminoethyl methacrylate) onto NR particles by using a redox initiator system viz; cumene hydroperoxide/tetraethylenepentamine, followed by dialysis for purification...
October 12, 2017: International Journal of Biological Macromolecules
keyword
keyword
20164
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"