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https://www.readbyqxmd.com/read/28231537/release-kinetics-of-esterified-p-coumaric-acid-and-ferulic-acid-from-rice-straw-in-mild-alkaline-solution
#1
Tran Ngoc Linh, Hirokata Fujita, Akiyoshi Sakoda
The release kinetics of esterified p-coumaric acid (PCA) and ferulic acid (FA) from rice straw under a mild alkaline condition were investigated to collect fundamental data for the design of a recovery process. The results showed that the straw size, NaOH concentration, and temperature were the key parameters governing release kinetics. The analysis demonstrated that FA is released considerably faster than PCA. The close relationship between lignin and the PCA dissolution indicates a reciprocal and/or simultaneous release...
February 7, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28231446/how-will-kinetics-and-thermodynamics-inform-our-future-efforts-to-understand-and-build-biological-systems
#2
(no author information available yet)
No abstract text is available yet for this article.
February 22, 2017: Cell Systems
https://www.readbyqxmd.com/read/28231419/absolute-photoionization-cross-sections-of-two-cyclic-ketones-cyclopentanone-cyclohexanone
#3
Chelsea Price, Yasmin Fathi, Giovanni Meloni
Absolute photoionization cross sections for cyclopentanone and cyclohexanone, as well as partial ionization cross sections for the dissociative ionized fragments, are presented in this investigation. Experiments are performed via a multiplexed photoionization mass spectrometer utilizing VUV synchrotron radiation supplied by the Advanced Light Source of Lawrence Berkeley National Laboratory. These results allow the quantification of these species that is relevant to investigate the kinetics and combustion reactions of potential biofuels...
February 23, 2017: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/28231312/analysis-of-the-t-cell-response-to-zika-virus-and-identification-of-a-novel-cd8-t-cell-epitope-in-immunocompetent-mice
#4
Ryan D Pardy, Maaran M Rajah, Stephanie A Condotta, Nathan G Taylor, Selena M Sagan, Martin J Richer
Zika virus (ZIKV) is an emerging arbovirus of the Flaviviridae family. Although ZIKV infection is typically mild and self-limiting in healthy adults, infection has been associated with neurological symptoms such as Guillain-Barré syndrome, and a causal link has been established between fetal microcephaly and ZIKV infection during pregnancy. These risks, and the magnitude of the ongoing ZIKV pandemic, have created an urgent need for the development of animal models to study the immune response to ZIKV infection...
February 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28231305/effects-of-vasoactive-drugs-on-crystalloid-fluid-kinetics-in-septic-sheep
#5
Yuhong Li, Zheng Xiaozhu, Ru Guomei, Ding Qiannan, Robert G Hahn
PURPOSE: Crystalloid fluid and vasoactive drugs are used in the early treatment of sepsis. The purpose of the present study was to examine how these drugs alter plasma volume expansion, peripheral edema, and urinary excretion. METHODS: Twenty-five anesthetized sheep were made septic by cecal puncture and a short infusion of lipopolysaccharide. After 50 min, a slow infusion of isotonic saline was initiated: the saline either contained no drug, norepinephrine (1 μg/kg/min), phenylephrine (3 μg/kg/min), dopamine (50 μg/kg/min), or esmolol (50 μg/kg/min)...
2017: PloS One
https://www.readbyqxmd.com/read/28231247/favipiravir-pharmacokinetics-in-ebola-infected-patients-of-the-jiki-trial-reveals-concentrations-lower-than-targeted
#6
Thi Huyen Tram Nguyen, Jérémie Guedj, Xavier Anglaret, Cédric Laouénan, Vincent Madelain, Anne-Marie Taburet, Sylvain Baize, Daouda Sissoko, Boris Pastorino, Anne Rodallec, Géraldine Piorkowski, Sara Carazo, Mamoudou N Conde, Jean-Luc Gala, Joseph Akoi Bore, Caroline Carbonnelle, Frédéric Jacquot, Hervé Raoul, Denis Malvy, Xavier de Lamballerie, France Mentré
BACKGROUND: In 2014-2015, we assessed favipiravir tolerance and efficacy in patients with Ebola virus (EBOV) disease (EVD) in Guinea (JIKI trial). Because the drug had never been used before for this indication and that high concentrations of the drugs were needed to achieve antiviral efficacy against EBOV, a pharmacokinetic model had been used to propose relevant dosing regimen. Here we report the favipiravir plasma concentrations that were achieved in participants in the JIKI trial and put them in perspective with the model-based targeted concentrations...
February 23, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28231086/a-theoretical-analysis-for-assessing-the-variability-of-secondary-model-thermal-inactivation-kinetic-parameters
#7
Maria C Giannakourou, Nikolaos G Stoforos
Traditionally, for the determination of the kinetic parameters of thermal inactivation of a heat labile substance, an appropriate index is selected and its change is measured over time at a series of constant temperatures. The rate of this change is described through an appropriate primary model and a secondary model is applied to assess the impact of temperature. By this approach, the confidence intervals of the estimates of the rate constants are not taken into account. Consequently, the calculated variability of the secondary model parameters can be significantly lower than the actual variability...
January 12, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231082/rheometric-non-isothermal-gelatinization-kinetics-of-chickpea-flour-based-gluten-free-muf%C3%AF-n-batters-with-added-biopolymers
#8
María Dolores Alvarez, Francisco Javier Cuesta, Beatriz Herranz, Wenceslao Canet
An attempt was made to analyze the elastic modulus (G0) of chickpea flour (CF)-based muffin batters made with CF alone and with added biopolymers (whey protein (WP), xanthan gum (XG), inulin (INL), and their blends) in order to evaluate their suitability to be a wheat flour (WF) substitute in muffins, and to model the heat-induced gelatinization of batters under non-isothermal heating condition from 25 ◦C to 90 ◦C. A rheological approach is proposed to determine the kinetic parameters (reaction order (n), frequency factor (k0), and activation energy (Ea)) using linearly-increasing temperature...
January 2, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28231048/original-research-paper-formulation-and-pharmaceutical-development-of-quetiapine-fumarate-sustained-release-matrix-tablets-using-a-qbd-approach
#9
Alexandru Gavan, Alina Porfire, Cristina Marina, Ioan Tomuta
The main objective of the present study was to apply QbD methodology in the development of once-a-day sustained release quetiapine tablets. The quality target product profile (QTPP) was defined after the pharmaceutical properties and kinetic release of the innovator product, Seroquel XR 200 mg. For the D-optimal experimental design, the level and ratio of matrix forming agents and the type of extragranular diluent were chosen as independent inputs, which represented critical formulation factors. The critical quality attributes (CQAs) studied were the cumulative percentages of quetiapine released after certain time intervals...
March 1, 2017: Acta Pharmaceutica
https://www.readbyqxmd.com/read/28231003/utilization-of-gastrointestinal-simulator-gis-an-in-vivo-predictive-dissolution-methodology-coupled-with-computational-approach-to-forecast-oral-absorption-of-dipyridamole
#10
Kazuki Matsui, Yasuhiro Tsume, Susumu Takeuchi, Amanda Searls, Gordon L Amidon
Weakly basic drugs exhibit a pH-dependent dissolution profile in the gastrointestinal (GI) tract, making it difficult to predict their oral absorption profile. The aim of this study was to investigate the utility of the Gastrointestinal Simulator (GIS), a novel in vivo predictive dissolution (iPD) methodology, in predicting the in vivo behavior of the weakly basic drug, dipyridamole, when coupled with in silico analysis. The GIS is a multi-compartmental dissolution apparatus, which represents physiological gastric emptying in the fasted state...
February 23, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28230994/artifact-free-and-detection-profile-independent-higher-order-fluorescence-correlation-spectroscopy-for-microsecond-resolved-kinetics-1-multi-detector-and-sub-binning-approach
#11
Farshad Abdollah-Nia, Martin P Gelfand, Alan K Van Orden
Fluorescence correlation spectroscopy (FCS) is a powerful tool in the time-resolved analysis of non-reacting or reacting molecules in solution, based on fluorescence intensity fluctuations. However, conventional (second-order) FCS alone is insufficient to measure all parameters needed to describe a reaction or mixture, including concentrations, fluorescence brightnesses, and forward and reverse rate constants. For this purpose, correlations of higher powers of fluorescence intensity fluctuations can be calculated to yield additional information from the single-photon data stream collected in an FCS experiment...
February 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28230975/tuning-of-recombinant-protein-expression-in-escherichia-coli-by-manipulating-transcription-translation-initiation-rates-and-incorporation-of-non-canonical-amino-acids
#12
Orr Schlesinger, Yonatan Chemla, Mathias Heltberg, Eden Ozer, Ryan Marshall, Vincent Noireaux, Mogens Hogh Jensen, Lital Alfonta
Protein synthesis in cells has been thoroughly investigated and characterized over the past 60 years. However, some fundamental issues remain unresolved, including the reasons for genetic code redundancy and codon bias. In this study, we changed the kinetics of the E. coli transcription and translation processes by mutating the promoter and ribosome binding domains and by using genetic code expansion. The results expose a counterintuitive phenomenon, whereby an increase in the initiation rates of transcription and translation lead to a decrease in protein expression...
February 23, 2017: ACS Synthetic Biology
https://www.readbyqxmd.com/read/28230971/multifaceted-gold-palladium-bimetallic-nanorods-and-their-geometric-compositional-and-catalytic-tunabilities
#13
Lichao Sun, Qingfeng Zhang, Guangfang Grace Li, Esteban Villarreal, Xiaoqi Fu, Hui Wang
Kinetically controlled, seed-mediated coreduction provides a robust and versatile synthetic approach to multimetallic nanoparticles with precisely controlled geometries and compositions. Here we demonstrate that single-crystalline cylindrical Au nanorods selectively transform into a series of structurally distinct Au@Au-Pd alloy core-shell bimetallic nanorods with exotic multifaceted geometries enclosed by specific types of facets upon seed-mediated Au-Pd coreduction under diffusion controlled conditions. By adjusting several key synthetic parameters, such as the Pd/Au precursor ratio, the reducing agent concentration, the capping surfactant concentration, and foreign metal ion additives, we have been able to simultaneously fine-tailor the atomic-level surface structures and fine-tune the compositional stoichiometries of the multifaceted Au-Pd bimetallic nanorods...
February 23, 2017: ACS Nano
https://www.readbyqxmd.com/read/28230968/inhibition-of-%C3%AE-synuclein-fibril-elongation-by-hsp70-is-governed-by-a-kinetic-binding-competition-between-%C3%AE-synuclein-species
#14
Francesco A Aprile, Paolo Arosio, Giuliana Fusco, Serene W Chen, Janet R Kumita, Anne Dhulesia, Paolo Tortora, Tuomas P J Knowles, Michele Vendruscolo, Christopher M Dobson, Nunilo Cremades
The Hsp70 family of chaperones plays an essential role in suppressing protein aggregation in the cell. Here we investigate the factors controlling the intrinsic ability of human Hsp70 to inhibit the elongation of amyloid fibrils formed by the Parkinson's disease-related protein α-synuclein. Using kinetic analysis, we show that Hsp70 binds preferentially to α-synuclein fibrils as a consequence of variations in the association and dissociation rate constants of binding to the different aggregated states of the protein...
February 23, 2017: Biochemistry
https://www.readbyqxmd.com/read/28230930/in-silico-design-of-optimal-dissolution-kinetics-of-fe-doped-zno-nanoparticles-results-in-cancer-specific-toxicity-in-a-preclinical-rodent-model
#15
Bella B Manshian, Suman Pokhrel, Uwe Himmelreich, Kaido Tämm, Lauri Sikk, Alberto Fernández, Robert Rallo, Tarmo Tamm, Lutz Mädler, Stefaan J Soenen
Cancer cells have unique but widely varying characteristics that have proven them difficult to be treated by classical therapeutics and calls for novel and selective treatment options. Nanomaterials (NMs) have been shown to display biological effects as a function of their chemical composition, and the extent and exact nature of these effects can vary between different biological environments. Here, ZnO NMs are doped with increasing levels of Fe, which allows to finely tune their dissolution rate resulting in significant differences in their biological behavior on cancer or normal cells...
February 23, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28230869/a-combined-high-temperature-experimental-and-theoretical-kinetic-study-of-the-reaction-of-dimethyl-carbonate-with-oh-radicals
#16
Fethi Khaled, Binod Raj Giri, Milán Szőri, Tam V-T Mai, Lam K Huynh, Aamir Farooq
The reaction kinetics of dimethyl carbonate (DMC) and OH radicals were investigated behind reflected shock waves over the temperature range of 872-1295 K and at pressures near 1.5 atm. Reaction progress was monitored by detecting OH radicals at 306.69 nm using a UV laser absorption technique. The rate coefficients for the reaction of DMC with OH radicals were extracted using a detailed kinetic model developed by Glaude et al. (Proc. Combust. Inst. 2005, 30(1), 1111-1118). The experimental rate coefficients can be expressed in Arrhenius form as: kexpt'l = 5...
February 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28230867/ultrafast-electron-and-hole-transfer-dynamics-of-a-solar-cell-dye-containing-hole-acceptors-on-mesoporous-tio2-and-al2o3
#17
Mirko Scholz, Oliver Flender, Gerrit Boschloo, Kawon Oum, Thomas Lenzer
The stability of dye cations against recombination with conduction band electrons in mesoporous TiO2 electrodes is a key property for improving light harvesting in dye-sensitised solar cells. Using ultrafast transient broadband absorption spectroscopy, we monitor efficient intramolecular hole transfer in the solar cell dye E6 having two peripheral triarylamine acceptors. After photoexcitation, two hole transfer mechanisms are identified: a concerted mechanism for electron injection and hole transfer (2.4 ps) and a sequential mechanism with time constants of 3...
February 23, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28230529/single-molecule-fret-unveils-induced-fit-mechanism-for-substrate-selectivity-in-flap-endonuclease-1
#18
Fahad Rashid, Paul D Harris, Manal S Zaher, Mohamed A Sobhy, Luay I Joudeh, Chunli Yan, Hubert Piwonski, Susan E Tsutakawa, Ivaylo Ivanov, John A Tainer, Satoshi Habuchi, Samir M Hamdan
Human flap endonuclease 1 (FEN1) and related structure-specific 5'nucleases precisely identify and incise aberrant DNA structures during replication, repair and recombination to avoid genomic instability. Yet, it is unclear how the 5'nuclease mechanisms of DNA distortion and protein ordering robustly mediate efficient and accurate substrate recognition and catalytic selectivity. Here, single-molecule sub-millisecond and millisecond analyses of FEN1 reveal a protein-DNA induced-fit mechanism that efficiently verifies substrate and suppresses off-target cleavage...
February 23, 2017: ELife
https://www.readbyqxmd.com/read/28230379/enantioselective-hydroaminomethylation-of-olefins-enabled-by-rh-br%C3%A3-nsted-acid-relay-catalysis
#19
Jing Meng, Xing-Han Li, Zhi-Yong Han
Herein, by employing a rhodium catalyst with a commercial ligand and a phosphoric acid catalyst, highly chemo-, regio-, and enantioselective hydroaminomethylation of olefins is realized through a relay catalytic hydroformylation/dynamic kinetic reductive amination process. The method features mild conditions (1 bar of syngas, room temperature in most cases), high yields (up to 99%), and high enantioselectivities (up to >99.5:0.5 er). Besides styrenes, acrylamides also provided the products with high yields and enantioselectivities...
February 23, 2017: Organic Letters
https://www.readbyqxmd.com/read/28230377/tailoring-anisotropic-li-ion-transport-tunnels-on-orthogonally-arranged-li-rich-layered-oxide-nanoplates-towards-high-performance-li-ion-batteries
#20
Ming Xu, Linfeng Fei, Wei-Bing Zhang, Tao Li, Wei Lu, Nian Zhang, Yanqing Lai, Zhian Zhang, Jing Fang, Kai Zhang, Jie Li, Haitao Huang
High-performance Li-rich layered oxide (LRLO) cathode material is appealing for next-generation Li-ion batteries owing to its high specific capacity (>300 mAh g-1). Despite intense studies in past decade, the low initial Coulombic efficiency and unsatisfactory cycling stability of LRLO still remain great challenges for its practical application. Here, we report a rational design of the orthogonally arranged {010}-oriented LRLO nanoplates with built-in anisotropic Li+ ion transport tunnels. Such a novel structure enables fast Li+ ion intercalation and deintercalation kinetics and enhanced structure stability for LRLO...
February 23, 2017: Nano Letters
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