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Nuclear magnetic resonance

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https://www.readbyqxmd.com/read/28431285/two-benzoyl-coumarin-amide-fluorescence-chemosensors-for-cyanide-anions
#1
Zian Wang, Qianqian Wu, Jiale Li, Shuang Qiu, Duxia Cao, Yongxiao Xu, Zhiqiang Liu, Xueying Yu, Yatong Sun
Two new benzoyl coumarin amide derivatives with ortho hydroxyl benzoyl as terminal group have been synthesized. Their photophysical properties and recognition properties for cyanide anions in acetonitrile have also been examined. The influence of electron donating diethylamino group in coumarin ring and hydroxyl in benzoyl group on recognition properties was explored. The results indicate that the compounds can recognize cyanide anions with obvious absorption and fluorescence spectral change and high sensitivity...
April 13, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28430739/downstream-indication-to-revascularization-following-hybrid-cardiac-pet-mri-preliminary-results
#2
Julien Priamo, Dionysos Adamopoulos, Oliver Rager, Angela Frei, Stephane Noble, David Carballo, Osman Ratib, René Nkoulou
BACKGROUND: Hybrid PET/MRI allows the acquisition of both fluorine-18-fluorodeoxyglucose (F-FDG) PET and cardiac magnetic resonance (CMR) during one session. Whether this will result in different referral to coronary revascularization (CR) is unknown. We compared this new hybrid method with all-nuclear/all-CMR methods in the assessment of viable myocardium and in downstream referral to CR. PATIENTS AND METHODS: Overall, 12 patients with rest perfusion defects on a single photon emission computed tomography (SPECT) were recruited for cardiac viability assessment using a PET/MRI device...
April 20, 2017: Nuclear Medicine Communications
https://www.readbyqxmd.com/read/28430557/utilization-management-of-high-cost-imaging-in-an-outpatient-setting-in-a-large-stable-patient-and-provider-cohort-over-7-years
#3
Jeffrey B Weilburg, Christopher L Sistrom, Daniel I Rosenthal, Markus B Stout, Keith J Dreyer, Helaine R Rockett, Jason M Baron, Timothy G Ferris, James H Thrall
Purpose To quantify the effect of a comprehensive, long-term, provider-led utilization management (UM) program on high-cost imaging (computed tomography, magnetic resonance imaging, nuclear imaging, and positron emission tomography) performed on an outpatient basis. Materials and Methods This retrospective, 7-year cohort study included all patients regularly seen by primary care physicians (PCPs) at an urban academic medical center. The main outcome was the number of outpatient high-cost imaging examinations per patient per year ordered by the patient's PCP or by any specialist...
April 21, 2017: Radiology
https://www.readbyqxmd.com/read/28430414/dynamic-and-energetic-signatures-of-adenine-tracts-in-a-ra-dt-rna-dna-hybrid-and-in-homologous-rna-dna-rna-rna-and-dna-dna-double-helices
#4
Yuegao Huang, Irina M Russu
Nuclear magnetic resonance spectroscopy and proton exchange are being used to characterize the opening reactions of individual base pairs in the RNA-DNA hybrid 5'-rGCGAUAAAAAGGCC-3'/5'-dGGCCTTTTTATCGC-3'. The hybrid contains a central tract of five rA-dT base pairs. The rates and the equilibrium constant of the opening reaction for each base pair are determined from the dependence of the exchange rates of imino protons on ammonia concentration, at 10°C. The results are compared to those previously obtained by our laboratory for three homologous duplexes of the same base sequence (except for the appropriate T/U substitution), containing tracts of dA-rU, rA-rU or dA-dT base pairs...
April 21, 2017: Biochemistry
https://www.readbyqxmd.com/read/28430379/-17-o-mrs-assesses-the-effect-of-mild-hypothermia-on-oxygen-consumption-rate-in-tumors
#5
Marie-Aline Neveu, Nicolas Joudiou, Géraldine De Preter, Jean-Paul Dehoux, Bénédicte F Jordan, Bernard Gallez
Although oxygen consumption is a key factor in metabolic phenotyping, its assessment in tumors remains critical, as current technologies generally display poor specificity. The objectives of this study were to explore the feasibility of direct (17) O nuclear magnetic resonance (NMR) spectroscopy to assess oxygen metabolism in tumors and its modulations. To investigate the impact of hypometabolism induction in the murine fibrosarcoma FSAII tumor model, we monitored the oxygen consumption of normothermic (37°C) and hypothermic (32°C) tumor-bearing mice...
April 21, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28430107/superconductivity-and-magnetic-fluctuations-developing-in-the-vicinity-of-strong-first-order-magnetic-transition-in-cras
#6
Hisashi Kotegawa, Kei Matsushima, Shingo Nakahara, Hideki Tou, Jun Kanetoshi, Taihei Nishiwaki, Eiichi Matsuoka, Hitoshi Sugawara, Hisatomo Harima
We report single crystal preparation, resistivity, and nuclear quadrupole resonance (NQR) measurements for new pressure-induced superconductor CrAs. In the first part, we present the difference between crystals made by different thermal sequences and methods, and show the sample dependence of superconductivity in CrAs. In the latter part, we show NQR data focusing the microscopic electronic state at the phase boundary between the helimagnetic (HM) and the paramagnetic (PM) phases. They suggest strongly that a quantum critical point is absent on the pressure-temperature phase diagram of CrAs, because of the strong first-order character of the magnetic transition; however, the spin fluctuations are observed in the PM phase...
April 21, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28429292/preparation-of-chloramphenicol-amino-acid-combinations-exhibiting-enhanced-dissolution-rates-and-reduced-drug-induced-oxidative-stress
#7
Vanesa B Sterren, Virginia Aiassa, Claudia Garnero, Yamila Garro Linck, Ana K Chattah, Gustavo A Monti, Marcela R Longhi, Ariana Zoppi
Chloramphenicol is an old antibiotic agent that is re-emerging as a valuable alternative for the treatment of multidrug-resistant pathogens. However, it exhibits suboptimal biopharmaceutical properties and toxicity profiles. In this work, chloramphenicol was combined with essential amino acids (arginine, cysteine, glycine, and leucine) with the aim of improving its dissolution rate and reduce its toxicity towards leukocytes. The chloramphenicol/amino acid solid samples were prepared by freeze-drying method and characterized in the solid state by using Fourier transform infrared spectroscopy, powder X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, and solid-state nuclear magnetic resonance...
April 20, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28429285/the-organogermanium-compound-ge-132-interacts-with-nucleic-acid-components-and-inhibits-the-catalysis-of-adenosine-substrate-by-adenosine-deaminase
#8
Yasuhiro Shimada, Katsuyuki Sato, Tomoya Takeda, Yoshihiko Tokuji
Poly-trans-[(2-carboxyethyl)germasesquioxane] (Ge-132) is a water-soluble organogermanium compound that exerts various physiological effects, including anti-inflammatory activity and pain relief. In water, Ge-132 is hydrolyzed to 3-(trihydroxygermyl)propanoic acid (THGP), which in turn is capable of interacting with cis-diol compounds through its trihydroxy group, indicating that this compound could also interact with diol-containing nucleic acid constituents. In this study, we evaluated the ability of THGP to interact with nucleosides or nucleotides via nuclear magnetic resonance (NMR) analysis...
April 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28427461/inhibitory-activities-of-selected-sudanese-medicinal-plants-on-porphyromonas-gingivalis-and-matrix-metalloproteinase-9-and-isolation-of-bioactive-compounds-from-combretum-hartmannianum-schweinf-bark
#9
Ebtihal Abdalla M Mohieldin, Ali Mahmoud Muddathir, Tohru Mitsunaga
BACKGROUND: Periodontal diseases are one of the major health problems and among the most important preventable global infectious diseases. Porphyromonas gingivalis is an anaerobic Gram-negative bacterium which has been strongly implicated in the etiology of periodontitis. Additionally, matrix metalloproteinases-9 (MMP-9) is an important factor contributing to periodontal tissue destruction by a variety of mechanisms. The purpose of this study was to evaluate the selected Sudanese medicinal plants against P...
April 20, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28426843/understanding-the-risks-and-harms-of-management-of-incidental-thyroid-nodules-a-review
#10
Jenny K Hoang, Xuan V Nguyen
Importance: Incidental thyroid nodules are defined as nodules originally detected in a patient with no thyroid-related clinical symptoms, examination findings, or suspected thyroid disease. Medical imaging for diseases in the neck, chest, and spine is a common source of incidental thyroid nodules. They are easily detected but poorly characterized. The next step is to decide whether the incidental thyroid nodule should be further evaluated with ultrasonography. Observations: Indiscriminate workup of incidental thyroid nodules with ultrasonography is not cost-effective and is potentially harmful...
April 20, 2017: JAMA Otolaryngology—Head & Neck Surgery
https://www.readbyqxmd.com/read/28425543/in-situ-nuclear-magnetic-resonance-microimaging-of-live-biofilms-in-a-microchannel
#11
R S Renslow, M J Marshall, A E Tucker, W B Chrisler, X-Y Yu
Biofilms are comprised of microbial cells and an extracellular polymeric substance (EPS) matrix that supports interactions between community members and with the local environment. The highly hydrated EPS matrix makes the application of many biofilm visualization techniques difficult. Hence, to better visualize how biofilms interact with their environment, there is a need for imaging techniques to monitor hydrated state biofilm dynamics. We employed an in situ dynamic approach to construct label-free images of biofilms...
April 20, 2017: Analyst
https://www.readbyqxmd.com/read/28425152/nmr-structures-and-molecular-dynamics-simulation-of-hylin-a1-peptide-analogs-interacting-with-micelles
#12
Edson Crusca, Amanda Souza Câmara, Carolina Oliveira Matos, Reinaldo Marchetto, Eduardo Maffud Cilli, Luciano Morais Lião, Aline Lima de Oliveira
Antimicrobial peptides are recognized candidates with pharmaceutical potential against epidemic emerging multi-drug resistant bacteria. In this study, we use nuclear magnetic resonance spectroscopy and molecular dynamics simulations to determine the unknown structure and evaluate the interaction with dodecylphosphatidylcholine (DPC) and sodium dodecylsulphate (SDS) micelles with three W(6) -Hylin-a1 analogs antimicrobial peptides (HyAc, HyK, and HyD). The HyAc, HyK, and HyD bound to DPC micelles are all formed by a unique α-helix structure...
April 20, 2017: Journal of Peptide Science: An Official Publication of the European Peptide Society
https://www.readbyqxmd.com/read/28424978/the-physicochemical-investigation-of-17%C3%AE-estradiol-crystalline-prepared-by-in-situ-ph-dependent-solubility-technique-with-polyvinylpyrrolidone
#13
Hui Xiong, Jinping Fu, Hanjing Sun, Enfu Wang, Yunhui Ding, Guobin Ren, Qiufang Jing, Fuzheng Ren
Micro-particles of 17β-estradiol (ED) were prepared with polyvinylpyrrolidone (PVP) by in situ pH-dependent solubility technique. Products were characterized using multiple instruments, and molecular interactions between ED and PVP were explored. Powder X-ray diffraction and thermal analysis revealed crystalline ED in the micro-particles is hemihydrated. PVP was also present in the micro-particles. Laser particle size analysis and scanning electron microscopy revealed thin slice morphology, which might have resulted from the influence of PVP...
April 19, 2017: AAPS PharmSciTech
https://www.readbyqxmd.com/read/28424496/the-chemical-characterization-of-nigerian-propolis-samples-and-their-activity-against-trypanosoma-brucei
#14
Ruwida Omar, John O Igoli, Tong Zhang, Alexander I Gray, Godwin U Ebiloma, Carol J Clements, James Fearnley, RuAngeli Edrada Ebel, Tim Paget, Harry P de Koning, David G Watson
Profiling of extracts from twelve propolis samples collected from eight regions in Nigeria was carried out using high performance liquid chromatography (LC) coupled with evaporative light scattering (ELSD), ultraviolet detection (UV) and mass spectrometry (MS), gas chromatography mass spectrometry (GC-MS) and nuclear magnetic resonance spectroscopy (NMR). Principal component analysis (PCA) of the processed LC-MS data demonstrated the varying chemical composition of the samples. Most of the samples were active against Trypanosoma b...
April 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28424370/multi-site-binding-of-epigallocatechin-gallate-to-human-serum-albumin-measured-by-nmr-and-isothermal-calorimetry
#15
Joshua D Eaton, Mike P Williamson
The affinity of epigallocatechin gallate (EGCG) for human serum albumin was measured in physiological conditions using nuclear magnetic resonance (NMR) and isothermal titration calorimetry (ITC). NMR estimated the self-dissociation constant of EGCG as 50 mM. NMR showed two binding events: strong (n1 = 1.8 ± 0.2; Kd1 = 19 ± 12 μM), and weak (n2 ~ 20; Kd2 = 40 ± 20 mM). ITC also showed two binding events: strong (n1 = 2.5 ± 0.03; Kd1 = 21.6 ± 4.0 μM), and weak (n2 = 9 ± 1; Kd2 = 22 ± 4 mM). The two techniques are consistent, with an unexpectedly high number of bound EGCG...
April 19, 2017: Bioscience Reports
https://www.readbyqxmd.com/read/28424077/plasma-metabolomics-for-the-diagnosis-and-prognosis-of-h1n1-influenza-pneumonia
#16
Mohammad M Banoei, Hans J Vogel, Aalim M Weljie, Anand Kumar, Sachin Yende, Derek C Angus, Brent W Winston
BACKGROUND: Metabolomics is a tool that has been used for the diagnosis and prognosis of specific diseases. The purpose of this study was to examine if metabolomics could be used as a potential diagnostic and prognostic tool for H1N1 pneumonia. Our hypothesis was that metabolomics can potentially be used early for the diagnosis and prognosis of H1N1 influenza pneumonia. METHODS: (1)H nuclear magnetic resonance spectroscopy and gas chromatography-mass spectrometry were used to profile the metabolome in 42 patients with H1N1 pneumonia, 31 ventilated control subjects in the intensive care unit (ICU), and 30 culture-positive plasma samples from patients with bacterial community-acquired pneumonia drawn within the first 24 h of hospital admission for diagnosis and prognosis of disease...
April 19, 2017: Critical Care: the Official Journal of the Critical Care Forum
https://www.readbyqxmd.com/read/28422500/influence-of-13-c-isotopic-labeling-location-on-dynamic-nuclear-polarization-of-acetate
#17
Peter NIedbalski, Christopher Parish, Andhika Kiswandhi, Zoltán Kovács, Lloyd Laporca Lumata
Dynamic nuclear polarization (DNP) via the dissolution method has alleviated the insensitivity problem in liquid-state nuclear magnetic resonance (NMR) spectroscopy by amplifying the signals by several thousand-fold. This NMR signal amplification process emanates from the microwave-mediated transfer of high electron spin alignment to the nuclear spins at high magnetic field and cryogenic temperature. Since the interplay between the electrons and nuclei is crucial, the chemical composition of a DNP sample such as the type of free radical used, glassing solvents, or the nature of the target nuclei can significantly affect the NMR signal enhancement levels that can be attained with DNP...
April 19, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28422067/synthesis-characterization-antimicrobial-and-antiproliferative-activity-evaluation-of-cu-ii-co-ii-zn-ii-ni-ii-and-pt-ii-complexes-with-isoniazid-derived-compound
#18
Elena Pahonțu, Diana-Carolina Ilieș, Sergiu Shova, Camelia Oprean, Virgil Păunescu, Octavian Tudorel Olaru, Flavian Ștefan Rădulescu, Aurelian Gulea, Tudor Roșu, Doina Drăgănescu
Hydrazone complexes of Cu(II), Co(II), Zn(II), Ni(II) and Pt(II) with N-isonicotinoyl-N'-(3-metoxy-2 hydroxybenzaldehyde)-hydrazone (HL) were synthesized and characterized by different physico-chemical techniques including elemental and thermal analysis, magnetic susceptibility measurements, molar electric conductivity, as well as IR (infrared), ¹H-NMR and (13)C-NMR (hydrogen and carbon nuclear magnetic resonance, UV-Vis (ultraviolet-visible), FAB (fast atom bombardment), EPR (electron paramagnetic resonance), and mass spectroscopies...
April 19, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28420137/modification-of-the-mycotoxin-deoxynivalenol-using-microorganisms-isolated-from-environmental-samples
#19
Nina M Wilson, Nicole McMaster, Dash Gantulga, Cara Soyars, Susan P McCormick, Ken Knott, Ryan S Senger, David G Schmale
The trichothecene mycotoxin deoxynivalenol (DON) is a common contaminant of wheat, barley, and maize. New strategies are needed to reduce or eliminate DON in feed and food products. Microorganisms from plant and soil samples collected in Blacksburg, VA, USA, were screened by incubation in a mineral salt media containing 100 μg/mL DON and analysis by gas chromatography mass spectrometry (GC/MS). Two mixed cultures derived from soil samples consistently decreased DON levels in assays using DON as the sole carbon source...
April 15, 2017: Toxins
https://www.readbyqxmd.com/read/28420092/analysis-of-sub-lethal-toxicity-of-perfluorooctane-sulfonate-pfos-to-daphnia-magna-using-%C3%A2-h-nuclear-magnetic-resonance-based-metabolomics
#20
Martha N Kariuki, Edward G Nagato, Brian P Lankadurai, André J Simpson, Myrna J Simpson
¹H nuclear magnetic resonance (NMR)-based metabolomics was used to characterize the response of Daphnia magna after sub-lethal exposure to perfluorooctane sulfonate (PFOS), a commonly found environmental pollutant in freshwater ecosystems. Principal component analysis (PCA) scores plots showed significant separation in the exposed samples relative to the controls. Partial least squares (PLS) regression analysis revealed a strong linear correlation between the overall metabolic response and PFOS exposure concentration...
April 14, 2017: Metabolites
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