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Magnetic resonance spectroscopy

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https://www.readbyqxmd.com/read/29223956/residual-risk-of-atherosclerotic-cardiovascular-events-in-relation-to-reductions-in-very-low-density-lipoproteins
#1
Patrick R Lawler, Akintunde O Akinkuolie, Paulo Harada, Robert J Glynn, Daniel I Chasman, Paul M Ridker, Samia Mora
BACKGROUND: It is uncertain whether pharmacological reductions in very-low-density lipoproteins (VLDLs), and their component triglyceride and cholesterol could reduce residual risk of atherosclerotic cardiovascular disease (ASCVD) events among individuals in whom low-density lipoprotein cholesterol (LDL-C) has been adequately lowered. We examined whether individuals with greater on-statin reductions in VLDL-related measures-beyond reductions in LDL-C-were at further reduced risk of ASCVD...
December 9, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29223811/predicting-apparent-singlet-oxygen-quantum-yields-of-dissolved-black-carbon-and-humic-substances-using-spectroscopic-indices
#2
Ziyan Du, Yingsheng He, Jianing Fan, Heyun Fu, Shourong Zheng, Zhaoyi Xu, Xiaolei Qu, Ao Kong, Dongqiang Zhu
Dissolved black carbon (DBC) is ubiquitous in aquatic systems, being an important subgroup of the dissolved organic matter (DOM) pool. Nevertheless, its aquatic photoactivity remains largely unknown. In this study, a range of spectroscopic indices of DBC and humic substance (HS) samples were determined using UV-Vis spectroscopy, fluorescence spectroscopy, and proton nuclear magnetic resonance. DBC can be readily differentiated from HS using spectroscopic indices. It has lower average molecular weight, but higher aromaticity and lignin content...
November 30, 2017: Chemosphere
https://www.readbyqxmd.com/read/29223569/isolated-mangiferin-and-naringenin-exert-antidiabetic-effect-via-ppar%C3%AE-glut4-dual-agonistic-action-with-strong-metabolic-regulation
#3
Ashok K Singh, Vinit Raj, Amit K Keshari, Amit Rai, Pranesh Kumar, Atul Rawat, Biswanath Maity, Dinesh Kumar, Anand Prakash, Arnab De, Amalesh Samanta, Bolay Bhattacharya, Sudipta Saha
In this study, we isolated two compounds from the leaves of Salacia oblonga (SA1, mangiferin and SA2, naringenin), and their structures were confirmed by infrared spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, and mass spectrometry. SA1 and SA2 were orally administered to streptozotocin-induced diabetic rats at 50 and 100 mg/kg daily for 15 days. Blood glucose level, serum lipid profile, oxidative stress parameters, histopathology, docking, molecular parameters, and NMR-based metabolic perturbation studies were performed to investigate the pharmacological activities of SA1 and SA2...
December 6, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29223496/multi-modal-imaging-investigation-of-anterior-cingulate-cortex-cytoarchitecture-in-neurodevelopment
#4
Natalie J Forde, Jilly Naaijen, David J Lythgoe, Sophie E A Akkermans, Thaïra J C Openneer, Andrea Dietrich, Marcel P Zwiers, Pieter J Hoekstra, Jan K Buitelaar
Multi-modal imaging may improve our understanding of the relationship between cortical morphology and cytoarchitecture. To this end we integrated the analyses of several magnetic resonance imaging (MRI) and spectroscopy (MRS) metrics within the anterior cingulate cortex (ACC). Considering the ACCs role in neurodevelopmental disorders, we also investigated the association between neuropsychiatric symptoms and the various metrics. T1 and diffusion-weighted MRI and 1H-MRS (ACC voxel) data along with phenotypic information were acquired from children (8-12 years) with various neurodevelopmental disorders (n=95) and healthy controls (n=50)...
December 6, 2017: European Neuropsychopharmacology: the Journal of the European College of Neuropsychopharmacology
https://www.readbyqxmd.com/read/29223443/response-to-pioglitazone-in-patients-with-nonalcoholic-steatohepatitis-with-vs-without-type-2-diabetes
#5
Fernando Bril, Srilaxmi Kalavalapalli, Virginia C Clark, Romina Lomonaco, Consuelo Soldevila-Pico, I-Chia Liu, Beverly Orsak, Fermin Tio, Kenneth Cusi
BACKGROUND & AIMS: Pioglitazone is effective for long-term treatment of patients with nonalcoholic steatohepatitis (NASH) with prediabetes or type-2 diabetes. However, it is not clear how the presence of type-2 diabetes affects the drug's efficacy. We compared metabolic and histologic responses to pioglitazone in patients with NASH and prediabetes vs type-2 diabetes. METHODS: We performed a prospective study of adults with biopsy-proven NASH (52 with type-2 diabetes and 49 with prediabetes), enrolled from the general population of San Antonio, Texas from 2008 through 2014...
December 6, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29223118/speciation-of-chromium-compounds-from-humic-acid-zeolite-y-to-an-ionic-liquid-during-extraction
#6
Hsin-Liang Huang, Yu Jhe Wei
By synchrotron X-ray absorption spectroscopy, chemical structures of hexavalent chromium (Cr(VI))/trivalent chromium (Cr(III)) adsorbed on humic acid (HA)-zeolite Y and extracted in an ionic liquid (1-butyl-3-methylimidazolium tetrafluoroborate ([C4mim][BF4])) have been studied. By combining the competitive adsorption results and reduction of Cr(VI)-HA with the carboxyl groups of HA, Cr(III)-HA (58%) was shown to be the major compound in HA-zeolite Y using synchrotron X-ray absorption near-edge structure (XANES) spectroscopy...
November 28, 2017: Chemosphere
https://www.readbyqxmd.com/read/29221924/unraveling-co-translational-protein-folding-concepts-and-methods
#7
REVIEW
Anton A Komar
Advances in techniques such as nuclear magnetic resonance spectroscopy, cryo-electron microscopy, and single-molecule and time-resolved fluorescent approaches are transforming our ability to study co-translational protein folding both in vivo in living cells and in vitro in reconstituted cell-free translation systems. These approaches provide comprehensive information on the spatial organization and dynamics of nascent polypeptide chains and the kinetics of co-translational protein folding. This information has led to an improved understanding of the process of protein folding in living cells and should allow remaining key questions in the field, such as what structures are formed within nascent chains during protein synthesis and when, to be answered...
December 5, 2017: Methods: a Companion to Methods in Enzymology
https://www.readbyqxmd.com/read/29221791/online-effects-of-transcranial-direct-current-stimulation-on-prefrontal-metabolites-in-gambling-disorder
#8
Maya Dickler, Christophe Lenglos, Emmanuelle Renauld, Francine Ferland, Richard A Edden, Jean Leblond, Shirley Fecteau
Gambling disorder is characterized by persistent maladaptive gambling behaviors and is now considered among substance-related and addictive disorders. There is still unmet therapeutic need for these clinical populations, however recent advances indicate that interventions targeting the Glutamatergic/GABAergic system hold promise in reducing symptoms in substance-related and addictive disorders, including gambling disorder. There is some data indicating that transcranial direct current stimulation may hold clinical benefits in substance use disorders and modulate levels of brain metabolites including glutamate and GABA...
December 5, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/29221153/-68ga-pentixafor-for-cxcr4-imaging-in-a-pc-3-prostate-cancer-xenograft-model-comparison-with-18f-fdg-pet-ct-mri-and-ex-vivo-receptor-expression
#9
Sarah M Schwarzenböck, Jan Stenzel, Thomas Otto, Heike V Helldorff, Carina Bergner, Jens Kurth, Stefan Polei, Tobias Lindner, Romina Rauer, Alexander Hohn, Oliver W Hakenberg, Hans J Wester, Brigitte Vollmar, Bernd J Krause
Purpose: The aim was to characterize the properties of [68Ga]Pentixafor as tracer for prostate cancer imaging in a PC-3 prostate cancer xenograft mouse model and to investigate its correlation with [18F]FDG PET/CT, magnetic resonance imaging (MRI) and ex vivo analyses. Methods: Static [68Ga]Pentixafor and [18F]FDG PET as well as morphological/ diffusion weighted MRI and 1H MR spectroscopy was performed. Imaging data were correlated with ex vivo biodistribution and CXCR4 expression in PC-3 tumors (immunohistochemistry (IHC), mRNA analysis)...
November 10, 2017: Oncotarget
https://www.readbyqxmd.com/read/29219943/replacement-of-sedentary-time-with-physical-activity-impact-on-lipoproteins
#10
Catherine M Phillips, Christina B Dillon, Ivan J Perry
PURPOSE: Limited data on the relationship between physical activity and lipoprotein particle profiles exist. Our objective was to investigate associations between objectively measured physical activity and lipoprotein particle size and number, and specifically whether substituting daily sedentary behaviour with light activity or moderate to vigorous physical activity (MVPA), is associated with beneficial alterations to the lipoprotein profile among adults and those at increased cardiometabolic risk (obese and insulin resistant subjects)...
December 7, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/29218634/walking-the-seven-lines-binuclear-copper-a-in-cytochrome-c-oxidase-and-nitrous-oxide-reductase
#11
REVIEW
Peter M H Kroneck
The enzymes nitrous oxide reductase (N2OR) and cytochrome c oxidase (COX) are constituents of important biological processes. N2OR is the terminal reductase in a respiratory chain converting N2O to N2 in denitrifying bacteria; COX is the terminal oxidase of the aerobic respiratory chain of certain bacteria and eukaryotic organisms transforming O2 to H2O accompanied by proton pumping. Different spectroscopies including magnetic resonance techniques, were applied to show that N2OR has a mixed-valent Cys-bridged [Cu1...
December 7, 2017: Journal of Biological Inorganic Chemistry: JBIC
https://www.readbyqxmd.com/read/29218027/corrigendum-assessing-metabolism-and-injury-in-acute-human-traumatic-brain-injury-with-magnetic-resonance-spectroscopy-current-and-future-applications
#12
Matthew G Stovell, Jiun-Lin Yan, Alison Sleigh, Marius O Mada, T Adrian Carpenter, Peter J A Hutchinson, Keri L H Carpenter
[This corrects the article on p. 426 in vol. 8, PMID: 28955291.].
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/29217493/effects-of-proximity-and-noise-level-of-phased-array-coil-elements-on-overall-signal-to-noise-in-parallel-mr-spectroscopy
#13
Candace C Fleischer, Xiaodong Zhong, Hui Mao
Parallel imaging using phased array coils facilitates accelerated magnetic resonance imaging (MRI) and spectroscopy (MRS). Parallel data reconstruction requires the combination of data from individual coil elements, but limited combination algorithms currently exist for higher-order phased arrays and MRS data. Here, we present a systematic framework for identifying coil proximity-related signal inhomogeneities and noise levels in phased array coils that may affect sensitivity of parallel MRS. Single-voxel MRS was acquired in nine voxel positions in a brain spectroscopy phantom on a 3T whole-body MR scanner using commercially available 64-, 32-, and 20-channel phased array coils...
December 4, 2017: Magnetic Resonance Imaging
https://www.readbyqxmd.com/read/29216817/characterization-of-sulfhydryl-oxidase-from-aspergillus-tubingensis
#14
Outi Nivala, Greta Faccio, Mikko Arvas, Perttu Permi, Johanna Buchert, Kristiina Kruus, Maija-Liisa Mattinen
BACKGROUND: Despite of the presence of sulfhydryl oxidases (SOXs) in the secretomes of industrially relevant organisms and their many potential applications, only few of these enzymes have been biochemically characterized. In addition, basic functions of most of the SOX enzymes reported so far are not fully understood. In particular, the physiological role of secreted fungal SOXs is unclear. RESULTS: The recently identified SOX from Aspergillus tubingensis (AtSOX) was produced, purified and characterized in the present work...
December 8, 2017: BMC Biochemistry
https://www.readbyqxmd.com/read/29216715/how-strong-is-the-hydrogen-bond-in-hybrid-perovskites
#15
Katrine L Svane, Alexander C Forse, Clare P Grey, Gregor Kieslich, Anthony K Cheetham, Aron Walsh, Keith T Butler
Hybrid organic-inorganic perovskites represent a special class of metal-organic framework where a molecular cation is encased in an anionic cage. The molecule-cage interaction influences phase stability, phase transformations and the molecular dynamics. We examine the hydrogen bonding in four AmBX3 formate perovskites: [Am]Zn(HCOO)3, with Am+ = hydrazinium (NH2NH3+), guanidinium (C(NH2)3+), dimethylammonium (CH3)2NH2+ and azetidinium (CH2)3NH2+. We develop a scheme to quantify the strength of hydrogen bonding in these systems from first-principles, which separates the electrostatic interactions between the amine (Am+) and the BX3- cage...
December 8, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29216235/association-between-memory-impairment-and-brain-metabolite-concentrations-in-north-korean-refugees-with-posttraumatic-stress-disorder
#16
Jung Eun Shin, Chi-Hoon Choi, Jong Min Lee, Jun Soo Kwon, So Hee Lee, Hyun-Chung Kim, Na Young Han, Soo-Hee Choi, So Young Yoo
Individuals with posttraumatic stress disorder (PTSD) had experiences of enormous psychological stress that can result in neurocognitive and neurochemical changes. To date, the causal relationship between them remains unclear. The present study is to investigate the association between neurocognitive characteristics and neural metabolite concentrations in North Korean refugees with PTSD. A total of 53 North Korean refugees with or without PTSD underwent neurocognitive function tests. For neural metabolite scanning, magnetic resonance spectroscopy of the hippocampus and anterior cingulate cortex (ACC) has been conducted...
2017: PloS One
https://www.readbyqxmd.com/read/29215468/task-based-metabolic-changes-in-the-left-dorsolateral-prefrontal-region-during-the-letter-n-back-working-memory-task-using-proton-magnetic-resonance-spectroscopy
#17
Anupa A Vijayakumari, Bejoy Thomas, Ramshekhar N Menon, Chandrasekharan Kesavadas
Neuroimaging and electrophysiological studies have consistently provided evidence on the role of dorsolateral prefrontal cortex in working memory. Recent studies have shown that the changes in metabolites in the brain could be detected upon functional activation using proton magnetic resonance spectroscopy. Therefore, we carried out a study in healthy control participants to understand the changes in metabolites during a letter N-back working memory task in the left dorsolateral prefrontal region. Single-voxel spectra were acquired from the left dorsolateral prefrontal region in 10 healthy control participants...
December 5, 2017: Neuroreport
https://www.readbyqxmd.com/read/29215275/x-shaped-oligomeric-pyromellitimide-polyradicals
#18
Yilei Wu, Ji-Min Han, Michael Hong, Matthew D Krzyaniak, Anthea K Blackburn, Isurika R Fernando, Dennis D Cao, Michael R Wasielewski, J Fraser Stoddart
The synthesis of stable organic polyradicals is important for the development of magnetic materials. Herein, we report the synthesis, isolation, and characterization of a series of X-shaped pyromellitimide (PI) oligomers (Xn-R, n = 2-4, R = Hex or Ph) linked together by single C-C bonds between their benzenoid cores. We hypothesize that these oligomers might form high-spin states in their reduced forms because of the nearly orthogonal conformations adopted by their PI units. 1H and 13C nuclear magnetic resonance (NMR) spectroscopies confirmed the isolation of the dimeric, trimeric, and tetrameric homologues...
December 7, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/29215137/frequency-and-phase-correction-for-multiplexed-edited-mrs-of-gaba-and-glutathione
#19
Mark Mikkelsen, Muhammad G Saleh, Jamie Near, Kimberly L Chan, Tao Gong, Ashley D Harris, Georg Oeltzschner, Nicolaas A J Puts, Kim M Cecil, Iain D Wilkinson, Richard A E Edden
PURPOSE: Detection of endogenous metabolites using multiplexed editing substantially improves the efficiency of edited magnetic resonance spectroscopy. Multiplexed editing (i.e., performing more than one edited experiment in a single acquisition) requires a tailored, robust approach for correction of frequency and phase offsets. Here, a novel method for frequency and phase correction (FPC) based on spectral registration is presented and compared against previously presented approaches...
December 7, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29215073/solution-structure-of-the-major-fish-allergen-parvalbumin-sco-j-1-derived-from-the-pacific-mackerel
#20
Hiroyuki Kumeta, Haruka Nakayama, Kenji Ogura
Although fish is an important part of the human diet, it is also a common source of food allergy. The major allergen in fish is parvalbumin, a well-conserved Ca2+-binding protein found in the white muscle of many fish species. Here, we studied the solution structure of the parvalbumin Sco j 1, derived from the Pacific mackerel, using nuclear magnetic resonance spectroscopy. We mapped the IgE-binding epitope proposed in a recent study onto the present structure. Interestingly, three of four residues, which were elucidated as key residues of the IgE-binding epitope, were exposed to solvent, whereas one residue faced the inside of the molecule...
December 7, 2017: Scientific Reports
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