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https://www.readbyqxmd.com/read/28520446/-diabetic-foot-syndrome-importance-of-calf-muscles-mr-spectroscopy-in-the-assessment-of-limb-ischemia-and-effect-of-revascularization
#1
Andrea Němcová, Michal Dubský, Alexandra Jirkovská, Petr Šedivý, Miloslav Drobný, Milan Hájek, Monika Dezortová, Robert Bém, Vladimíra Fejfarová, Anna Pyšná
AIM: The standard method for assessment of effect of revascularization in patients with diabetic foot (DF) and critical limb ischemia (CLI) is transcutaneous oxygen pressure (TcPO2). Phosphorus magnetic resonance spectroscopy (31P MRS) enables to evaluate oxidative muscle metabolism that could be impaired in patients with diabetes and its complications. The aim of our study was to compare MRS of calf muscle between patients with DF and CLI and healthy controls and to evaluate the contribution of MRS in the assessment of the effect of revascularization...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/28516761/a-facile-and-sensitive-near-infrared-fluorescence-probe-for-the-detection-of-endogenous-alkaline-phosphatase-activity-in-vivo
#2
Song-Jiao Li, Chunyan Li, Yongfei Li, Junjie Fei, Ping Wu, Bin Yang, Juan Ou-Yang, Shi-Xin Nie
Alkaline phosphatase (ALP) is an essential enzyme and widely distributes in a variety of tissues. To date, various nanomaterial and small-molecule fluorescent probes for ALP have been constructed successfully, but the emission wavelengths of these probes are in the ultraviolet or visible range, which is not beneficial for bioimaging. Herein, a merocyanine-based near-infrared (NIR) fluorescent probe named CyP is first synthesized and used to detect ALP activity. The characteristics of probe CyP are as follows: (1) The probe possesses a facile structure, which can be obtained by easy synthetic steps...
May 18, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28493996/left-ventricular-functional-structural-and-energetic-effects-of-normal-aging-comparison-with-hypertension
#3
Jehill D Parikh, Kieren G Hollingsworth, Dorothy Wallace, Andrew M Blamire, Guy A MacGowan
OBJECTIVES: Both aging and hypertension are significant risk factors for heart failure in the elderly. The purpose of this study was to determine how aging, with and without hypertension, affects left ventricular function. METHODS: Cross-sectional study of magnetic resonance imaging and 31P spectroscopy-based measurements of left ventricular structure, global function, strains, pulse wave velocity, high energy phosphate metabolism in 48 normal subjects and 40 treated hypertensive patients (though no other cardiovascular disease or diabetes) stratified into 3 age deciles from 50-79 years...
2017: PloS One
https://www.readbyqxmd.com/read/28488869/insights-into-the-correlation-of-aluminum-distribution-and-br%C3%A3-nsted-acidity-in-h-beta-zeolites-from-solid-state-nmr-spectroscopy-and-dft-calculations
#4
Rong-Rong Zhao, Zhenchao Zhao, Shikun Li, Weiping Zhang
Here we utilized 27Al MAS/MQMAS, 31P MAS NMR of quantitative adsorption of trimethylphosphine oxide (TMPO) and DFT calculations to elucidate the relationship between Al distribution and Brönsted acidity of series H-Beta zeolites derived from dealumination of Al-rich H-Beta zeolite. Three types of Brönsted acid strengths corresponding to different specific Al T-sites were demonstrated. Removal of one framework Al in 5MR2-2Al and 6MR-2Al sites led to increasing the Brönsted acid strength of dealuminated H-Beta...
May 10, 2017: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/28467982/adenosine-triphosphate-metabolism-measured-by-phosphorus-magnetic-resonance-spectroscopy-a-potential-biomarker-for-multiple-sclerosis-severity
#5
Paul Kauv, Samar S Ayache, Alain Créange, Moussa A Chalah, Jean-Pascal Lefaucheur, Jérôme Hodel, Pierre Brugières
BACKGROUND/AIMS: Phosphorus magnetic resonance spectroscopy (31P-MRS) has previously shown abnormal changes in energy metabolites in the brain of multiple sclerosis (MS) patients. However, the relationship between these energy metabolites - particularly adenosine triphosphate (ATP) - and the disease severity remains unclear. The objective of this study was to determine whether measuring ATP metabolites can help to predict disease severity in MS patients. METHODS: 31P-MRS at 3 tesla was performed in 9 relapsing remitting (RRMS), 9 secondary progressive MS patients (SPMS), and 10 age-matched healthy controls...
May 4, 2017: European Neurology
https://www.readbyqxmd.com/read/28448965/neuroprotective-treatments-after-perinatal-hypoxic-ischemic-brain-injury-evaluated-with-magnetic-resonance-spectroscopy
#6
Hester Rijkje Berger, Eva Brekke, Marius Widerøe, Tora Sund Morken
Perinatal hypoxic-ischemic brain injury is a major health problem. Adjuvant treatments that improve the neuroprotective effect of the current treatment, therapeutic hypothermia, are urgently needed. The growing knowledge about the complex pathophysiology of hypoxia-ischemia (HI) has led to the discovery of several important targets for neuroprotection. Early interventions should focus on the preservation of energy metabolism, the reduction of glutamate excitotoxicity and oxidative stress, the maintenance of calcium homeostasis, and the prevention of apoptosis...
April 28, 2017: Developmental Neuroscience
https://www.readbyqxmd.com/read/28441482/value-of-nmr-parameters-and-dft-calculations-for-quantum-information-processing-utilizing-phosphorus-heterocycles
#7
Jéssica B R Lino, Eduardo P Rocha, Teodorico C Ramalho
Quantum computing is the field of science that uses quantum-mechanical phenomena, such as superposition and entanglement, to perform operations on data. The fundamental information unit used in quantum computing is the quantum bit or qubit. It is well-known that quantum computers could theoretically be able to solve problems much more quickly than any classical computers. Currently, the first and still the most successful implementations of quantum information processing (QIP) have been based on nuclear spins in liquids...
May 4, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28421660/biocatalytic-asymmetric-phosphorylation-catalyzed-by-recombinant-glycerate-2-kinase
#8
Norman Hardt, Birhanu M Kinfu, Jennifer Chow, Wolfgang R Streit, Bernhard Schoenenberger, Markus Obkircher, Roland Wohlgemuth
The efficient synthesis of pure D-glycerate-2-phosphate is of much interest due to its importance as enzyme substrate and metabolite. A straightforward one-step biocatalytic phosphorylation of glyceric acid has been investigated. Glycerate 2-kinase from Thermotoga maritima has been expressed in Escherichia coli allowing easy purification. The selective glycerate 2-kinase-catalyzed phosphorylation has been followed by 31P-NMR and showed excellent enantioselectivity towards the phosphorylation of the D-enantiomer of glyceric acid...
April 18, 2017: Chembiochem: a European Journal of Chemical Biology
https://www.readbyqxmd.com/read/28370714/modulating-the-bonding-properties-of-n-heterocyclic-carbenes-nhcs-a-systematic-charge-displacement-analysis
#9
Paola Belanzoni, Carlo Alberto Gaggioli, Giovanni Bistoni, Gianluca Ciancaleoni, Francesco Tarantelli, Leonardo Belpassi
In this paper we provide a quantitative analysis of the chemical bond between a metal fragment AuCl and a series of 29 different NHCs in [(NHC)AuCl] complexes. NHCs electronic properties are modified through a: i) variation of the groups attached to the NHC nitrogen atoms or backbone, ii) change of unsaturation/size of the NHC ring, iii) inclusion of paracyclophane moieties, or iv) heteroatom substitution on the NHC ring. For evaluating the donation and back-donation components of the Dewar-Chatt-Duncanson (DCD) model in the NHCs-AuCl bond, we apply the CD-NOCV analysis, a methodology that avoids the constraint of using symmetrized structures...
April 3, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28338765/cerebral-magnesium-levels-in-preeclampsia-a-phosphorus-magnetic-resonance-spectroscopy-study
#10
Maria Nelander, Jan Weis, Lina Bergman, Anders Larsson, Anna-Karin Wikström, Johan Wikström
BACKGROUND: Magnesium sulfate (MgSO4) is used as a prophylaxis for eclamptic seizures. The exact mechanism of action is not fully established. We used phosphorus magnetic resonance spectroscopy (31P-MRS) to investigate if cerebral magnesium (Mg2+) levels differ between women with preeclampsia, normal pregnant, and nonpregnant women. METHODS: This cross-sectional study comprised 28 women with preeclampsia, 30 women with normal pregnancies in corresponding gestational week (range: 23-41 weeks) and 11 nonpregnant healthy controls...
February 21, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/28297126/a-planar-ti2-p2-core-assembled-by-reductive-decarbonylation-of-o-c%C3%A2-p-and-p-p-radical-coupling
#11
Lauren N Grant, Balazs Pinter, Brian C Manor, Riccardo Suter, Hansjörg Grützmacher, Daniel J Mindiola
The complex [(nacnac)Ti(OAr)]2 (μ2 :η(2) ,η(2) -P2 ) (1) is formed via reductive decarbonylation of the phosphaethynolate ion (-) [OCP], which serves as a P atom source. Complex 1 is the first structurally characterized Group 4 transition metal P2 complex and its structure reveals the rhombic Ti2 P2 core is essentially planar with short bond lengths suggesting some degree of multiple bonding character between the Ti-P and P-P sites. Computational studies of 1 provide an understanding of the Ti2 P2 core as well as the origin of the highly downfield (31) P NMR spectroscopic signal...
March 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28296979/feasibility-of-assessing-bone-matrix-and-mineral-properties-in-vivo-by-combined-solid-state-1h-and-31p-mri
#12
Xia Zhao, Hee Kwon Song, Alan C Seifert, Cheng Li, Felix W Wehrli
PURPOSE: To develop and evaluate an integrated imaging protocol for bone water and phosphorus quantification in vivo by solid-state 1H and 31P MRI. MATERIALS AND METHODS: All studies were HIPAA-compliant and were performed with institutional review board approval and written informed consent. Proton (1H) ultra-short echo-time (UTE) and phosphorus (31P) zero echo-time (ZTE) sequences were designed and implemented on a 3 T clinical MR scanner to quantify bone water and mineral in vivo...
2017: PloS One
https://www.readbyqxmd.com/read/28287708/lignin-films-from-spruce-eucalyptus-and-wheat-straw-studied-with-electroacoustic-and-optical-sensors-effect-of-composition-and-electrostatic-screening-on-enzyme-binding
#13
Antonio Pereira, Ingrid C Hoeger, Ana Ferrer, Jorge Rencoret, José C Del Rio, Kristiina Kruus, Jenni Rahikainen, Miriam Kellock, Ana Gutiérrez, Orlando J Rojas
Lignins were isolated from spruce, wheat straw, and eucalyptus by using the milled wood lignin (MWL) method. Functional groups and compositional analyses were assessed via 2D NMR and (31)P NMR to realize their effect on enzyme binding. Films of the lignins were fabricated and ellipsometry, atomic force microscopy, and water contact angle measurements were used for their characterization and to reveal the changes upon enzyme adsorption. Moreover, lignin thin films were deposited on quartz crystal microgravimetry (QCM) and surface plasmon (SPR) resonance sensors and used to gain further insights into the lignin-cellulase interactions...
March 23, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28271892/evolution-of-phosphorus-containing-groups-on-activated-carbons-during-heat-treatment
#14
Yongfang Wang, Songlin Zuo, Jianxiao Yang, Seong-Ho Yoon
Two types of activated carbons have been prepared by H3PO4 activation of lignocellulose and by H3PO4 modification of activated carbon, and then heat-treated at temperatures from 400 to 900 °C in an atmosphere of N2 or H2 to investigate the evolution of phosphorus-containing groups. Elemental analysis, X-ray photoelectron spectroscopy, (31)P nuclear magnetic resonance, nitrogen adsorption, and scanning electron microscopy have been used to analyze the physicochemical properties of the activated carbons. The results show that C-O-P linkages of phosphorus-containing groups can progressively evolve into C-P-O, C3-P═O, C3-P, and eventually elemental phosphorus as a result of heat treatment...
March 17, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28269741/preparation-of-orthophosphate-glasses-in-the-mgo-cao-sio2-nb2o5-p2o5-system
#15
Sungho Lee, Kyosuke Ueda, Takayuki Narushima, Takayoshi Nakano, Toshihiro Kasuga
BACKGROUND: Niobia/magnesia-containing orthophosphate invert glasses were successfully prepared in our earlier work. Orthophosphate groups in the glasses were cross-linked by tetrahedral niobia (NbO4) and magnesia. OBJECTIVE: The aim of this work is to prepare calcium orthophosphate invert glasses containing magnesia and niobia, incorporating silica, and to evaluate their structures and releasing behaviors. METHOD: The glasses were prepared by melt-quenching, and their structures and ion-releasing behaviors were evaluated...
2017: Bio-medical Materials and Engineering
https://www.readbyqxmd.com/read/28269681/a-three-element-1h-31p-dual-tuned-array-for-magnetic-resonance-spectroscopy-at-4-7-t
#16
Matthew D Wilcox, Romina Del Bosque, Kurt Parizek, Jeremy Sia, Edwin D Eigenbrodt, Mary P McDougall
This work describes the construction and testing of a three-element, double-tuned receive array and transmit coils for 31P-1H spectroscopy and imaging. The receive coils were geometrically-decoupled, single-loop surface coils and the transmit coils were concentric saddle coils. The coils were used to examine a physiologically-modeled CNC-milled phantom. The receive coil array was able to improve SNR while also providing gross localization of the 1H and 31P signals.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28218334/early-clinical-predictors-of-motor-function-in-the-upper-extremity-one-month-post-stroke
#17
Jenny Snickars, Hanna C Persson, Katharina S Sunnerhagen
OBJECTIVE: To investigate factors within 3 days post-stroke that could predict severe impairment in motor function in the upper extremity at one month post-stroke. METHODS: This cross-sectional study included 104 patients with first-ever stroke and impaired motor function in the upper extremity. Initial impairment in motor function, demographic data, type of stroke and stroke risk factors were chosen as possible predictors. Severe impairment in motor function was defined as ≤ 31p according to the Fugl-Meyer Assessment for Upper Extremity (FMA-UE)...
March 6, 2017: Journal of Rehabilitation Medicine
https://www.readbyqxmd.com/read/28195674/solvent-and-halogen-free-modification-of-biobased-polyphenols-to-introduce-vinyl-groups-versatile-aromatic-building-blocks-for-polymer-synthesis
#18
Antoine Duval, Luc Avérous
Various biobased polyphenols (lignins and condensed tannins) were derivatized with vinyl ethylene carbonate, a functional cyclic carbonate, to obtain multifunctional aromatic polymers bearing vinyl groups. The reaction was optimized on a condensed tannin and soda lignin. In both cases, full conversion of the phenol groups was achieved in only 1 h at 150 °C without solvent and with K2 CO3 as a cheap and safe catalyst. This reaction was later applied to other condensed tannins and technical lignins (Kraft and organosolv), showing only little dependence on the chemical structure of the polyphenols...
April 22, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28135800/dual-mode-of-action-for-plusbacin-a3-in-staphylococcus-aureus
#19
Robert D O'Connor, Manmilan Singh, James Chang, Sung Joon Kim, Michael VanNieuwenhze, Jacob Schaefer
We have used C{F}, N{F}, and N{P} rotational-echo double resonance NMR to determine the location and conformation of (19)F and (15)N double-labeled plusbacin A3 and of double-labeled deslipo-plusbacin A3, each bound to the cell walls of whole cells of Staphyloccocus aureus grown in media containing [1-(13)C]glycine. The (31)P is primarily in wall teichoic acid. Approximately 25% of plusbacin headgroups (the cyclic depsipeptide backbone) are in a closed conformation (N-F separation of 6 Å), while 75% are in a more open conformation (N-F separation of 12 Å)...
February 13, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28112681/acute-dietary-fat-intake-initiates-alterations-in-energy-metabolism-and-insulin-resistance
#20
Elisa Álvarez Hernández, Sabine Kahl, Anett Seelig, Paul Begovatz, Martin Irmler, Yuliya Kupriyanova, Bettina Nowotny, Peter Nowotny, Christian Herder, Cristina Barosa, Filipa Carvalho, Jan Rozman, Susanne Neschen, John G Jones, Johannes Beckers, Martin Hrabě de Angelis, Michael Roden
BACKGROUND: Dietary intake of saturated fat is a likely contributor to nonalcoholic fatty liver disease (NAFLD) and insulin resistance, but the mechanisms that initiate these abnormalities in humans remain unclear. We examined the effects of a single oral saturated fat load on insulin sensitivity, hepatic glucose metabolism, and lipid metabolism in humans. Similarly, initiating mechanisms were examined after an equivalent challenge in mice. METHODS: Fourteen lean, healthy individuals randomly received either palm oil (PO) or vehicle (VCL)...
February 1, 2017: Journal of Clinical Investigation
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