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https://www.readbyqxmd.com/read/28218334/early-clinical-predictors-of-motor-function-in-the-upper-extremity-one-month-post-stroke
#1
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)...
February 16, 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
#2
Antoine Duval, Luc Averous
Various biobased polyphenols (lignins and condensed tannins) were derivatized with vinyl ethylene carbonate, a functional cyclic carbonate, to obtain multifunctional aromatic polymers carrying vinyl groups. The reaction was optimized on a condensed tannin and soda lignin. In both cases, a full conversion of the phenol groups is achieved in only 1 h at 150 °C, without solvent and with K2CO3 as 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...
February 14, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28135800/dual-mode-of-action-for-plusbacin-a3-in-staphylococcus-aureus
#3
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
#4
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
https://www.readbyqxmd.com/read/28107017/cooperative-binding-in-a-phosphine-oxide-based-halogen-bonded-dimer-drives-supramolecular-oligomerization
#5
Leonardo Maugeri, Tomáš Lébl, David B Cordes, Alexandra M Z Slawin, Douglas Philp
Triphenylphosphine oxide forms halogen-bonded (XB) complexes with pentafluoroiodobenzene and a 1,4-diaryl-5-iodotriazole. The stability of these complexes is assessed computationally and by (31)P NMR spectroscopy in toluene-d8 solution, where both complexes are weakly associated. This knowledge is applied to the design and synthesis of two self-complementary phosphine oxide-iodotriazole hybrids that incorporate a phosphine oxide XB acceptor and a 1,4-diphenyl-5-iodotriazole XB donor within the same molecule...
February 1, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28061525/fluorogenic-gold-nanoparticle-aunp-substrate-a-model-for-the-controlled-release-of-molecules-from-aunp-nanocarriers-via-interfacial-staudinger-bertozzi-ligation
#6
Wilson Luo, Pierangelo Gobbo, Praveen N Gunawardene, Mark S Workentin
The ability to regulate small-molecule release from metallic nanoparticle substrates offers unprecedented opportunities for nanocarrier-based imaging, sensing, and drug-delivery applications. Herein we report a novel and highly specific release methodology off gold nanoparticle (AuNP) surfaces based on the bioorthogonal Staudinger-Bertozzi ligation. A thiol ligand bearing the molecular cargo, a Rhodamine B dye derivative, was synthesized and used to modify small water-soluble 5 nm AuNPs. Upon incorporation into the AuNP monolayer, we observed efficient quenching of the dye emission, resulting in a very low level of fluorescence emission that provided the baseline from which cargo release was monitored...
February 14, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28048761/mo-fg-campus-iep3-05-a-novel-model-for-evaluating-exercise-induced-skeletal-muscle-metabolism-with-phosphorus-mrs
#7
E Ripley, G Clarke, F Settles
PURPOSE: The phosphocreatine (PCr) recovery rate after exercise is used an index of mitochondrial function in muscle 31P-MRS. We tested the hypothesis that the initial rate of PCr recovery after exercise reflects the equilibrium mitochondrial ATP production rate required to balance ATP requirements during exercise. METHODS: Exercise data is often analyzed by fitting the PCr recovery curve to the Levenberg-Marquardt algorithm to determine the rate constant, k. In this study, the initial rates of change for PCr and inorganic phosphate (Pi) were examined at the beginning and after the end of exercise in the vastus lateralis...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042912/lignin-based-materials-through-thiol-maleimide-click-polymerization
#8
Pietro Buono, Antoine Duval, Luc Averous, Youssef Habibi
In the present work we propose an environmentally friendly approach to transform renewable feedstocks into value-added materials. This transformation pathway is conducted under green conditions, without the use of solvents and catalyst. First, controlled modification of lignin, a major biopolymer present in wood and plants, was achieved through the esterification with 11-maleimidoundecylenic acid (11-MUA), a derivative from ocastor oil that contains maleimide groups. Different degrees of substitution were achieved by using various amounts of the 11-MU acyl chloride leading to an efficient conversion of lignin hydroxyl groups as demonstrated by 1H and 31P NMR analyses...
January 2, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28030597/enoblock-does-not-inhibit-the-activity-of-the-glycolytic-enzyme-enolase
#9
Nikunj Satani, Yu-Hsi Lin, Naima Hammoudi, Sudhir Raghavan, Dimitra K Georgiou, Florian L Muller
Inhibition of glycolysis is of great potential for the treatment of cancer. However, inhibitors of glycolytic enzymes with favorable pharmacological profiles have not been forthcoming. Due to the nature of their active sites, most high-affinity transition-state analogue inhibitors of glycolysis enzymes are highly polar with poor cell permeability. A recent publication reported a novel, non-active site inhibitor of the glycolytic enzyme Enolase, termed ENOblock (N-[2-[2-2-aminoethoxy)ethoxy]ethyl]4-4-cyclohexylmethyl)amino]6-4-fluorophenyl)methyl]amino]1,3,5-triazin-2-yl]amino]benzeneacetamide)...
2016: PloS One
https://www.readbyqxmd.com/read/28004320/sensitivity-and-responsiveness-of-the-eq-5d-3l-in-patients-with-uncontrolled-focal-seizures-an-analysis-of-phase-iii-trials-of-adjunctive-brivaracetam
#10
Clara Mukuria, Tracey Young, Anju Keetharuth, Simon Borghs, John Brazier
PURPOSE: Preference-based measures are required to measure the impact of interventions for cost-effectiveness analysis. This study assessed the psychometric performance of the EQ-5D-3L in adults with uncontrolled focal (partial-onset) seizures. METHODS: Data from three Phase III studies of an antiepileptic drug (adjunctive brivaracetam; n = 1095) were used. Analysis included correlations between EQ-5D-3L and Quality of Life in Epilepsy Inventory (QOLIE-31P) and seizure frequency...
December 21, 2016: Quality of Life Research
https://www.readbyqxmd.com/read/27977044/li18-p6-n16-a-lithium-nitridophosphate-with-unprecedented-tricyclic-p6-n16-18-ions
#11
Eva-Maria Bertschler, Christian Dietrich, Jürgen Janek, Wolfgang Schnick
Li18 P6 N16 was synthesized by reaction of LiPN2 and Li7 PN4 at 5.5 GPa and 1273 K employing the multi-anvil technique. It is the first lithium nitridophosphate obtained by high-pressure synthesis. Moreover, it is the first example received by reaction of two ternary lithium nitrides. The combination of high-pressure conditions with a Li3 N flux enabled a complete structure determination using single-crystal X-ray diffraction. The hitherto unknown tricyclic [P6 N16 ](18-) anion is composed of six vertex-sharing PN4 tetrahedra forming one vierer- and two additional dreier-rings...
December 15, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27936777/peptizing-mechanism-at-the-molecular-level-of-laponite-nanoclay-gels
#12
Philip Kensbock, Dan Eugen Demco, Smriti Singh, Khosrow Rahimi, Radu Fechete, Andreas Walther, Annette Monika Schmidt, Martin Möller
In the presence of additives such as etidronic acid (1-hydroxyethane-1,1-diphosphonic acid, HEDP), a process of peptizing of Laponite clay gels takes place. The peptizing process at the molecular level was directly revealed by (31)P and (1)H high-resolution magic-angle sample spinning (HRMAS) NMR spectroscopy. Two NMR spectral components were detected and assigned to free etidronic acid and bound to the Laponite disk edges. Furthermore, with increase of temperature the ratio of bound-to-free etidronic acid increases...
December 21, 2016: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/27882723/an-in-depth-understanding-of-biomass-recalcitrance-using-natural-poplar-variants-as-the-feedstock
#13
Xianzhi Meng, Yunqiao Pu, Chang Geun Yoo, Mi Li, Garima Bali, Doh-Yeon Park, Erica Gjersing, Mark F Davis, Wellington Muchero, Gerald A Tuskan, Timothy J Tschaplinski, Arthur J Ragauskas
In an effort to better understand the biomass recalcitrance, six natural poplar variants were selected as feedstocks based on previous sugar release analysis. Compositional analysis and physicochemical characterizations of these poplars were performed and the correlations between these physicochemical properties and enzymatic hydrolysis yield were investigated. Gel permeation chromatography (GPC) and (13) C  solid state NMR were used to determine the degree of polymerization (DP) and crystallinity index (CrI) of cellulose, and the results along with the sugar release study indicated that cellulose DP likely played a more important role in enzymatic hydrolysis...
November 23, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27854210/skeletal-muscle-quantitative-nuclear-magnetic-resonance-imaging-and-spectroscopy-as-an-outcome-measure-for-clinical-trials
#14
Pierre G Carlier, Benjamin Marty, Olivier Scheidegger, Paulo Loureiro de Sousa, Pierre-Yves Baudin, Eduard Snezhko, Dmitry Vlodavets
Recent years have seen tremendous progress towards therapy of many previously incurable neuromuscular diseases. This new context has acted as a driving force for the development of novel non-invasive outcome measures. These can be organized in three main categories: functional tools, fluid biomarkers and imagery. In the latest category, nuclear magnetic resonance imaging (NMRI) offers a considerable range of possibilities for the characterization of skeletal muscle composition, function and metabolism. Nowadays, three NMR outcome measures are frequently integrated in clinical research protocols...
March 3, 2016: Journal of Neuromuscular Diseases
https://www.readbyqxmd.com/read/27786394/a-highly-emissive-water-soluble-phosphorus-corrole
#15
Mario L Naitana, Sara Nardis, Giuseppe Pomarico, Michele Raggio, Fabrizio Caroleo, Daniel O Cicero, Sara Lentini, Luca Prodi, Damiano Genovese, Saisameera Mitta, Anna Sgarlata, Massimo Fanfoni, Luca Persichetti, Roberto Paolesse
The synthesis, spectroscopic, and optical properties of the water-soluble phosphorus complex of a 2-sulfonato-10-(4-sulfonatophenyl)-5,15-dimesitylcorrole have been investigated. The compound was prepared by adopting a novel strategy for the corrole sulfonation, leading to the regioselective isomer in an almost quantitative yield. The phosphorus coordination has a key role in determining the corrole substitution pattern, limiting the formation of poly-substituted species, which affected the reaction of the corrole free base...
October 27, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27737951/insulin-resistance-is-associated-with-reduced-mitochondrial-oxidative-capacity-measured-by-31p-magnetic-resonance-spectroscopy-in-participants-without-diabetes-from-the-baltimore-longitudinal-study-of-aging
#16
Elisa Fabbri, Chee W Chia, Richard G Spencer, Kenneth W Fishbein, David A Reiter, Donnie Cameron, Ariel C Zane, Zenobia A Moore, Marta Gonzalez-Freire, Marco Zoli, Stephanie A Studenski, Rita R Kalyani, Josephine M Egan, Luigi Ferrucci
Whether individuals with insulin resistance (IR) but without criteria for diabetes exhibit reduced mitochondrial oxidative capacity is unclear; addressing this question could guide research for new therapeutics. We investigated 248 participants without diabetes from the Baltimore Longitudinal Study of Aging (BLSA) to determine whether impaired mitochondrial capacity is associated with prediabetes, IR, and duration and severity of hyperglycemia exposure. Mitochondrial capacity was assessed as the postexercise phosphocreatine recovery time constant (τPCr) by (31)P-magnetic resonance spectroscopy, with higher τPCr values reflecting reduced capacity...
January 2017: Diabetes
https://www.readbyqxmd.com/read/27736083/a-general-decomposition-pathway-for-phosphine-stabilized-metathesis-catalysts-lewis-donors-accelerate-methylidene-abstraction
#17
William L McClennan, Stephanie A Rufh, Justin A M Lummiss, Deryn E Fogg
Sterically accessible Lewis donors are shown to accelerate decomposition during catalysis, for a broad range of Grubbs-class metathesis catalysts. These include benzylidene derivatives RuCl2(NHC)(PCy3)(═CHPh) (Ru-2: NHC = H2IMes, a; IMes, b; H2IPr, c; IPr, d; H2ITol, e) and indenylidene complexes RuCl2(NHC)(PCy3)(═C15H10) (NHC = H2IMes, Ru-2f; IMes, Ru-2g). All of these precatalysts form methylidene complex RuCl2(NHC)(═CH2) Ru-3 as the active species in metathesis of terminal olefins, and generate RuCl2(NHC)(PCy3)(═CH2) Ru-4 as the catalyst resting state...
November 9, 2016: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/27731910/cationic-bismuth-amides-accessibility-structure-and-reactivity
#18
Hannah Dengel, Crispin Lichtenberg
The synthetic access to cationic bismuth compounds based on simple, monodentate, synthetically useful amido ligands, [Bi(NR2 )2 (L)n ](+) , has been investigated (R=Me, iPr, Ph; L=neutral ligand). With [BPh4 ](-) as a counteranion, the formation of contact ion pairs and subsequent phenyl transfer from B to Bi is observed. An intermediate of this reaction, [Bi(NMe2 )2 (HNMe2 )(BPh4 )] (1), could be isolated and fully characterized. The use of a fluorinated tetraarylborate as a counteranion leads to more stable cationic bismuth amides...
December 19, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27715042/diastereoselective-ortho-lithiation-of-phosphinimidic-amides-a-multinuclear-magnetic-resonance-and-computational-study
#19
Fernando López Ortiz, Jesús García López, María Casimiro, María José Iglesias
The structure of the dianion (SP,RC)-10 formed in the diastereoselective N,Cortho dilithiation of the phosphinimidic amide (RC)-Ph2P(═NCO2Me)NHCH(Me)Ph (5; dr of 95:5) with tert-butyllithium in THF has been elucidated using multinuclear magnetic resonance methods, including 2D (7)Li,(n)X-HMQC ((n)X = (15)N, (31)P) correlations. (SP,RC)-10 consists of a monomer in which C,N and N,O chelation of the lithium cations generates a system containing a five- and a six-membered metallacycle, respectively, sharing a P-N bond with the lithium atoms connected through the NCO moiety of the phosphazenyl group...
November 18, 2016: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27687143/experimental-and-first-principles-nmr-analysis-of-pt-ii-complexes-with-o-o-dialkyldithiophosphate-ligands
#20
Juho Roukala, Simon Orr, John V Hanna, Juha Vaara, Alexander V Ivanov, Oleg N Antzutkin, Perttu Lantto
Polycrystalline bis(dialkyldithiophosphato)Pt(II) complexes of the form Pt{S2P(OR)2}2 (R = ethyl, iso-propyl, iso-butyl, sec-butyl or cyclo-hexyl group) were studied using solid-state 31P and 195Pt NMR spectroscopy to determine the influence of the alkyl substituents to the structure of the central chromophore. Measured anisotropic chemical shift (CS) parameters for 31P and 195Pt tensors afford more detailed chemical and structural information as compared to isotropic NMR parameters, such as chemical shifts and J-couplings, alone...
September 30, 2016: Journal of Physical Chemistry. A
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