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https://www.readbyqxmd.com/read/28821137/preparation-of-highly-oxidized-starch-using-hydrogen-peroxide-and-its-application-as-a-novel-ligand-for-zirconium-tanning-of-leather
#1
Yue Yu, Ya-Nan Wang, Wei Ding, Jianfei Zhou, Bi Shi
A series of highly-oxidized starch (HOS) were prepared using H2O2 and a copper-iron catalyst as a desired ligand for zirconium tanning of leather. The effects of catalyst and H2O2 dosages, and reaction temperature on the oxidation degree (OD, represented as the amount of carbonyl and carboxyl groups derived) of starch were investigated. The OD reached 76.2% when oxidation was conducted using 60% H2O2 and 0.015% catalyst at 98°C for 2h. (13)C NMR and FT-IR illustrated carbonyl and carboxyl groups were formed in HOS after oxidation...
October 15, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28820975/features-of-proteolytic-properties-of-tetraphenylporphyrin-complex-with-lanthanide-group-metals
#2
Elena A Tobolkina, Tatiana A Skripnikova, Anna A Starikova, Galina I Shumilova, Andrey A Pendin
Demetallation of metalloporphyrin molecules is one of the essential degradation reactions in photosynthesis. The effect of metalloporphyrin nature on removal of central metals from tetraphenylporphyrin complexes based on lanthanide group metals (Dy, Er, Lu, Ho) has been studied. pH values, at which the metal ions leave the metalloporphyrin complex were established using two-phase spectrophotometric titration with potentiometric pH-control. The pH values decrease with the increase of atomic numbers of lanthanide groups, as well as with increase of 4f-electrons...
August 12, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28820951/lactation-consultants-perceived-barriers-to-providing-professional-breastfeeding-support
#3
Erica H Anstey, Martha Coulter, Cecilia M Jevitt, Kay M Perrin, Sharon Dabrow, Lynne B Klasko-Foster, Ellen M Daley
BACKGROUND: Addressing suboptimal breastfeeding initiation and duration rates is a priority in the United States. To address challenges to improving these rates, the voices of the providers who work with breastfeeding mothers should be heard. Research aim: The purpose of this study was to explore lactation consultants' perceived barriers to managing early breastfeeding problems. METHODS: This qualitative study was conducted with a grounded theory methodological approach...
August 1, 2017: Journal of Human Lactation: Official Journal of International Lactation Consultant Association
https://www.readbyqxmd.com/read/28820741/electromagnetic-and-optical-characteristics-of-nb5-doped-double-crossover-and-salmon-dna-thin-films
#4
Mitta Sekhar Babu, Sreekantha Reddy Dugasani, Soon-Gil Jung, Srivithya Vellampatti, Tuson Park, Sung Ha Park
We report the fabrication and physical characteristics of niobium ion (Nb5+)-doped double-crossover DNA (DX-DNA) and salmon DNA (SDNA) thin films. Different concentrations of Nb5+ ([Nb5+]) are coordinated into the DNA molecules, and the thin films are fabricated via substrate-assisted growth (DX-DNA) and drop-casting (SDNA) on oxygen plasma treated substrates. We conducted atomic force microscopy to estimate the optimum concentration of Nb5+ ([Nb5+]O = 0.08 mM) in Nb5+-doped DX-DNA thin films, up to which the DX-DNA lattices maintain their structures without deformation...
August 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28820723/a-lncrna-fine-tunes-the-dynamics-of-a-cell-state-transition-involving-lin28-let-7-and-de-novo-dna-methylation
#5
Meng Amy Li, Paulo P Amaral, Priscilla Cheung, Jan H Bergmann, Masaki Kinoshita, Tüzer Kalkan, Meryem Ralser, Sam Robson, Ferdinand von Meyenn, Maike Paramor, Fengtang Yang, Caifu Chen, Jennifer Nichols, David L Spector, Tony Kouzarides, Lin He, Austin Smith
Execution of pluripotency requires progression from the naïve status represented by mouse embryonic stem cells (ESCs) to a state capacitated for lineage specification. This transition is coordinated at multiple levels. Non-coding RNAs may contribute to this regulatory orchestra. We identified a rodent-specific long non-coding RNA (lncRNA) linc1281, hereafter Ephemeron (Eprn), that modulates the dynamics of exit from naïve pluripotency. Eprn deletion delays the extinction of ESC identity, an effect associated with perduring Nanog expression...
August 18, 2017: ELife
https://www.readbyqxmd.com/read/28820594/on-the-restrained-proton-indicator-in-combined-quantum-mechanics-molecular-mechanics-dynamics-simulations-of-proton-transfer-through-a-carbon-nanotube
#6
Adam W Duster, Hai Lin
Recently, a collective variable "proton indicator" was purposed for tracking an excess proton solvated in bulk water in molecular dynamics simulations. In this work, we demonstrate the feasibility of utilizing the position of this proton indicator as a reaction coordinate to model an excess proton migrating through a hydrophobic carbon nanotube in combined quantum-mechanics/molecular-mechanics simulations. Our results indicate that applying a harmonic restraint to the proton indicator in the bulk solvent near the nanotube pore entrance leads to the recruitment of water molecules into the pore...
August 18, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28820522/results-of-an-oncology-clinical-trial-nurse-role-delineation-study
#7
Michelle A Purdom, Sandra Petersen, Barbara K Haas
PURPOSE/OBJECTIVES: To evaluate the relevance of a five-dimensional model of clinical trial nursing practice in an oncology clinical trial nurse population. 
. DESIGN: Web-based cross-sectional survey.
. SETTING: Online via Qualtrics.
. SAMPLE: 167 oncology nurses throughout the United States, including 41 study coordinators, 35 direct care providers, and 91 dual-role nurses who provide direct patient care and trial coordination...
September 1, 2017: Oncology Nursing Forum
https://www.readbyqxmd.com/read/28820489/the-effect-of-hydrogen-bonding-in-enhancing-the-ionic-affinities-of-immobilized-monoprotic-phosphate-ligands
#8
Spiro D Alexandratos, Xiaoping Zhu
Environmental remediation requires ion-selective polymers that operate under a wide range of solution conditions. In one example, removal of trivalent and divalent metal ions from waste streams resulting from mining operations before they enter the environment requires treatment at acidic pH. The monoethyl ester phosphate ligands developed in this report operate from acidic solutions. They have been prepared on polystyrene-bound ethylene glycol, glycerol, and pentaerythritol, and it is found that intra-ligand hydrogen bonding affects their metal ion affinities...
August 18, 2017: Materials
https://www.readbyqxmd.com/read/28820351/genomic-and-chromatin-features-shaping-meiotic-double-strand-break-formation-and-repair-in-mice
#9
Shintaro Yamada, Seoyoung Kim, Sam E Tischfield, Maria Jasin, Julian Lange, Scott Keeney
The SPO11-generated DNA double-strand breaks (DSBs) that initiate meiotic recombination occur non-randomly across genomes, but mechanisms shaping their distribution and repair remain incompletely understood. Here, we expand on recent studies of nucleotide-resolution DSB maps in mouse spermatocytes. We find that trimethylation of histone H3 lysine 36 around DSB hotspots is highly correlated, both spatially and quantitatively, with trimethylation of H3 lysine 4, consistent with coordinated formation and action of both PRDM9-dependent histone modifications...
August 18, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28820283/n-3-pufas-induce-inflammatory-tolerance-by-formation-of-keap1-containing-sqstm1-p62-bodies-and-activation-of-nfe2l2
#10
Jennifer Mildenberger, Ida Johansson, Ismail Sergin, Eli Kjøbli, Jan Kristian Damås, Babak Razani, Trude Helen Flo, Geir Bjørkøy
Inflammation is crucial in the defense against infections but must be tightly controlled to limit detrimental hyperactivation. Our diet influences inflammatory processes and omega-3 polyunsaturated fatty acids (n-3 PUFAs) have known anti-inflammatory effects. The balance of pro- and anti-inflammatory processes is coordinated by macrophages and macroautophagy/autophagy has recently emerged as a cellular process that dampens inflammation. Here we report that the n-3 PUFA docosahexaenoic acid (DHA) transiently induces cytosolic speckles of the autophagic receptor SQSTM1/p62 (sequestosome 1) (described as SQSTM1/p62-bodies) in macrophages...
August 18, 2017: Autophagy
https://www.readbyqxmd.com/read/28820266/on-surface-synthesis-of-porous-carbon-nanoribbons-from-polymer-chains
#11
Maximilian Ammon, Tim Sander, Sabine Maier
We demonstrate the on-surface synthesis of porous carbon nanoribbons on Ag(111) via a preprogrammed isomerization of conformationally flexible polymer chains followed by dehydrogenation reactions using thermal annealing. The carbon chains are fabricated by the polymerization of the prochiral 1,3,5-tris(3-bromophenyl)benzene (mTBPB) precursors directly on the surface using an Ullmann-type reaction. At room temperature, mTBPB partially self-assembles in halogen-bonded 2D networks, which transform into organometallic chains and rings after debromination...
August 18, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28820253/bioinorganic-chemistry-of-parkinson-s-disease-affinity-and-structural-features-of-cu-i-binding-to-the-full-length-%C3%AE-synuclein-protein
#12
Marco C Miotto, Mayra D Pavese, Liliana Quintanar, Markus Zweckstetter, Christian Griesinger, Claudio O Fernández
Alterations in the levels of copper in brain tissue and formation of α-synuclein (αS)-copper complexes might play a key role in the amyloid aggregation of αS and the onset of Parkinson's disease (PD). Recently, we demonstrated that formation of the high-affinity Cu(I) complex with the N-terminally acetylated form of the protein αS substantially increases and stabilizes local conformations with α-helical secondary structure and restricted motility. In this work, we performed a detailed NMR-based structural characterization of the Cu(I) complexes with the full-length acetylated form of its homologue β-synuclein (βS), which is colocalized with αS in vivo and can bind copper ions...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28820250/coordination-and-thermodynamics-of-trivalent-curium-with-malonate-at-increased-temperatures-a-spectroscopic-and-quantum-chemical-study
#13
Andrej Skerencak-Frech, Michael Trumm, Daniel R Fröhlich, Petra J Panak
The complexation of Cm(III) with malonate is studied by time-resolved laser fluorescence spectroscopy (TRLFS) in the temperature range from 25 to 90 °C. Three complexes ([Cm(Mal)n](3-2n), n = 1, 2, 3) are identified and their molar fractions are determined as a function of the ligand concentration, the ionic strength, and the temperature. A general shift of the chemical equilibrium toward higher complexes with increasing temperature is observed, with the [CmMal3](3-) complex forming only at T > 40 °C. The conditional stability constants (log K'n(T)) are calculated and extrapolated to Im = 0 with the specific ion interaction theory (SIT)...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28820245/1-2-migration-of-n-diarylboryl-imidazol-2-ylidene-through-intermolecular-radical-process
#14
Wei-Chun Liu, Yi-Hung Liu, Tien-Sung Lin, Shie-Ming Peng, Ching-Wen Chiu
1,2-Boryl migration of N-boryl N-heterocyclic carbene to 2-boryl imidazole is proposed to proceed through generation and recombination of two radical intermediates, namely, a neutral diarylboron radical and a N-heterocyclic carbene radical. Crossover experiments suggest that these two radical species are stable enough to escape solvent cages and recombine intermolecularly. The presence of radical intermediates is further supported by spin trapping experiments. Besides, the coordination of Li(+) cation is found to be critical for the stability of the NHC radical...
August 18, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28820211/reactivity-of-the-parent-amido-complexes-of-iridium-with-olefins-c-nh2-bond-formation-versus-c-h-activation
#15
Inmaculada Mena, Pilar García-Orduña, Víctor Polo, Fernando J Lahoz, Miguel A Casado, Luis A Oro
Herein we report on the different chemical reactivity displayed by two mononuclear terminal amido compounds depending on the nature of the coordinated diene. Hence, treatment of amido-bridged iridium complexes [{Ir(μ-NH2)(tfbb)}3] (1; tfbb = tetrafluorobenzobarrelene) with dppp (dppp = bis(diphenylphosphane)propane) leads to the rupture of the amido bridges forming the mononuclear terminal amido compound [Ir(NH2)(dppp)(tfbb)] (3) in the first stage. On changing the reaction conditions, the formation of a C-NH2 bond between the amido moiety and the coordinated diene is observed and a new dinuclear complex [{Ir(1,2-η(2)-4-κ-C12H8F4N)(dppp)}2(μ-dppp)] (4) has been isolated...
August 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28820199/tuning-the-copper-ii-coordination-properties-of-cyclam-by-subtle-chemical-modifications
#16
Nathalie Camus, Nathalie Le Bris, Selbi Nuryyeva, Matthieu Chessé, David Esteban-Gómez, Carlos Platas-Iglesias, Raphaël Tripier, Mourad Elhabiri
The acid-base and copper(ii) coordination properties of three previously described cyclam derivatives are reported. Potentiometry, mass spectrometry, UV-vis absorption spectroscopy, electrochemistry and theoretical calculations were combined to investigate the protonation and binding properties of Bn-cyclam-EtOH (L1), oxo-cyclam-EtOH (L2) and oxo-Bn-cyclam-EtOH (L3). These three cyclams are C-functionalized by a hydroxyethyl pendant arm and display either one N-benzyl group and/or an amide replacing one macrocyclic secondary amine...
August 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28820192/comparison-of-classical-reaction-paths-and-tunneling-paths-studied-with-the-semiclassical-instanton-theory
#17
Jan Meisner, Max N Markmeyer, Matthias U Bohner, Johannes Kästner
Atom tunneling in the hydrogen atom transfer reaction of the 2,4,6-tri-tert-butylphenyl radical to 3,5-di-tert-butylneophyl, which has a short but strongly curved reaction path, was investigated using instanton theory. We found the tunneling path to deviate qualitatively from the classical intrinsic reaction coordinate, the steepest-descent path in mass-weighted Cartesian coordinates. To perform that comparison, we implemented a new variant of the predictor-corrector algorithm for the calculation of the intrinsic reaction coordinate...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28820191/comparative-photophysics-and-ultrafast-dynamics-of-dimethylaminochalcone-and-a-structurally-rigid-derivative-experimental-identification-of-tict-coordinate
#18
Rajib Ghosh, Biswajit Manna
Photophysical parameters and ultrafast dynamics of dimethylaminochalone (DMAC-A) have been compared with a structurally bridged analogue (namely, c-DMAC) in solvents of varying polarities. Conformational locking of the single bond connecting the donor and acceptor groups in c-DMAC arrests the twisted intramolecular charge transfer (TICT) relaxation and consequently the photophysical parameters such as fluorescence yield, fluorescence lifetime and triplet yield change significantly. The intramolecular charge transfer character of the LE state is found to be unaffected by conformational restriction...
August 18, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28819970/chemical-selectivity-at-grain-boundary-dislocations-in-monolayer-mo1-xwxs2-transition-metal-dichalcogenides
#19
Ziqian Wang, Yuhao Shen, Shoucong Ning, Yoshikazu Ito, Pan Liu, Zheng Tang, Takeshi Fujita, Akihiko Hirata, Mingwei Chen
Grain boundaries (GBs) are unavoidable crystal defects in polycrystalline materials and significantly influence their properties. However, the structure and chemistry of GBs in 2D transition metal dichalcogenide alloys have not been well established. Here we report significant chemical selectivity of transition metal atoms at GB dislocation cores in Mo1-xWxS2 monolayers. Different from classical elastic field-driven dislocation segregation in bulk crystals, the chemical selectivity in the 2D crystals originates prominently from variation of atomic coordination numbers at dislocation cores...
August 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28819940/the-analysis-of-repeatability-and-reproducibility-of-bladder-neck-mobility-measurements-obtained-during-pelvic-floor-sonography-performed-introitally-with-2d-transvaginal-probe
#20
Edyta Wlaźlak, Tomasz Kluz, Jacek Kociszewski, Karolina Frachowicz, Magdalena Janowska, Wiktor Wlaźlak, Grzegorz Surkont
OBJECTIVES: The aim of the study was the evaluation of repeatability and reproducibility of chosen urethral neck mobility measurements obtained during introital pelvic floor sonography performed with a 2D transvaginal probe. MATERIAL AND METHODS: In order to assess the repeatability and reproducibility, independent measurements on the ultra-sound image were taken by two specialists on 92 female patients at rest and at strain (Valsalva maneuver). 2D ultrasound examination was performed introitally with a transvaginal probe (PFS-TV)...
2017: Ginekologia Polska
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