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https://www.readbyqxmd.com/read/28230869/a-combined-high-temperature-experimental-and-theoretical-kinetic-study-of-the-reaction-of-dimethyl-carbonate-with-oh-radicals
#1
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/28208780/preparation-of-constrained-geometry-titanium-complexes-of-1-2-azasilinane-framework-for-ethylene-1-octene-copolymerization
#2
Seul Lee, Seung Soo Park, Jin Gu Kim, Chung Sol Kim, Bun Yeoul Lee
The Me₂Si-bridged ansa-Cp/amido half-metallocene, [Me₂Si(η⁵-Me₄C₅)(N(t)Bu)]TiCl₂, termed a "constrained-geometry catalyst (CGC)", is a representative homogeneous Ziegler catalyst. CGC derivatives with the [1,2]azasilinane framework, in which the amide alkyl substituent is joined by the Si-bridge, were prepared, and the catalytic performances of these species was studied. Me₄C₅HSi(Me)(CH₂CH=CH₂)-NH(C(R)(R')CH=CH₂) (R, R' = H or methyl; Me₄C₅H = tetramethylcyclopentadienyl) was susceptible to ring closure metathesis (RCM) when treated with Schrock's Mo-catalyst to afford -Si(Me₄C₅H)(Me)CH₂CH=CHC(R)(R')NH- containing a six-membered ring framework...
February 9, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28180224/an-open-route-to-asymmetric-substituted-al-al-bonds-using-al-i-and-al-iii-precursors
#3
Bin Li, Subrata Kundu, Hongping Zhu, Helena Keil, Regine Herbst-Irmer, Dietmar Stalke, Gernot Frenking, Diego M Andrada, Herbert W Roesky
The reaction of LAl: (L = HC[C(Me)N(Ar)]2, Ar = 2,6-iPr2C6H3) and cAAC:→AlX3 (X = Cl, I) (cAAC = cyclic alkyl amino carbene) results in strikingly asymmetric Al(ii)-Al(ii) compounds LAl(X)-Al(X)2-cAAC [X = Cl (2a); I (2b)]. In these dialuminum(ii) compounds the two Al atoms bear different ligand environments. For a detailed insight into the structures, theoretical calculations were carried out.
February 9, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28179573/role-of-eruption-season-in-reconciling-model-and-proxy-responses-to-tropical-volcanism
#4
Samantha Stevenson, John T Fasullo, Bette L Otto-Bliesner, Robert A Tomas, Chaochao Gao
The response of the El Niño/Southern Oscillation (ENSO) to tropical volcanic eruptions has important worldwide implications, but remains poorly constrained. Paleoclimate records suggest an "El Niño-like" warming 1 year following major eruptions [Adams JB, Mann ME, Ammann CM (2003) Nature 426:274-278] and "La Niña-like" cooling within the eruption year [Li J, et al. (2013) Nat Clim Chang 3:822-826]. However, climate models currently cannot capture all these responses. Many eruption characteristics are poorly constrained, which may contribute to uncertainties in model solutions-for example, the season of eruption occurrence is often unknown and assigned arbitrarily...
February 8, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28156592/symptom-burden-and-distress-in-patients-with-cancer-in-africa
#5
(no author information available yet)
: 255 Background: Cancer has become a significant public health problem in Africa but still most diagnoses are made late, Sitas et al (2006). The need for palliative care is significant due to the late contact with health care providers and the many symptoms they present with. No study has been undertaken to assess symptomatology for these patients in Africa. OBJECTIVE: To study the prevalence of symptoms in patients with cancer in an African setting. METHODS: Symptom studies from records of patients with cancer referred to the Palliative Care Services at the Aga Khan University Hospital, Nairobi in 6 months...
October 9, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/28146180/perceptional-gaps-among-women-husbands-and-family-members-about-intentions-for-birthplace-a-cross-sectional-study
#6
Yoko Shimpuku, Frida Elikana Madeni, Shigeko Horiuchi, Sebalda Charles Leshabari
Objective: women are more likely to give birth at a health facility when their families agree with the birthplace. However, in rural areas of Tanzania, women are often marginalized from decision-making. This study predicted birthplace intention and identified factors to reduce perceptional gaps among pregnant women, husbands and family members. Method: explanatory cross-sectional survey was conducted in three villages in North Eastern Tanzania. Participants were 138 pregnant women and their families who answered the Birth Intention Questionnaire (BIQ), measuring knowledge, attitude, perceived behavioral control, subjective norms and intention for birthplace...
January 30, 2017: Revista Latino-americana de Enfermagem
https://www.readbyqxmd.com/read/28111948/hybridization-of-zinc-oxide-tetrapods-for-selective-gas-sensing-applications
#7
O Lupan, V Postica, J Gröttrup, A K Mishra, N H de Leeuw, J F C Carreira, J Rodrigues, N Ben Sedrine, M R Correia, T Monteiro, V Cretu, I Tiginyanu, D Smazna, Y K Mishra, R Adelung
In this work, the exceptionally improved sensing capability of highly porous three-dimensional (3-D) hybrid ceramic networks toward reducing gases is demonstrated for the first time. The 3-D hybrid ceramic networks are based on doped metal oxides (MexOy and ZnxMe1-xOy, Me = Fe, Cu, Al) and alloyed zinc oxide tetrapods (ZnO-T) forming numerous junctions and heterojunctions. A change in morphology of the samples and formation of different complex microstructures is achieved by mixing the metallic (Fe, Cu, Al) microparticles with ZnO-T grown by the flame transport synthesis (FTS) in different weight ratios (ZnO-T:Me, e...
February 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28076313/ethnopharmacological-investigation-of-the-aerial-part-of-phragmites-karka-poaceae
#8
Ramiz Ahmed Sultan, Mohammad Shah Hafez Kabir, Mir Muhammad Nasir Uddin, Mohi Uddin, Zobaer Al Mahmud, Sheikh Zahir Raihan, Nazmul Qais
BACKGROUND: In this ethnopharmacological study, methanolic extract of the aerial plant parts of Phragmites karka (Family: Poaceae) and its petroleum ether and carbon tetrachloride fractions were investigated for bioactivities in Swiss-albino mice, namely, analgesic, central nervous system (CNS) depressant, hypoglycemic, and antidiarrheal activity. METHODS: The cold methanolic extract of the aerial plant parts of Phragmites karka (MEPK) was first prepared, and it was then further fractionated as petroleum ether (PEFMEPK) and carbon tetrachloride (CTFMEPK) fractions...
January 11, 2017: Journal of Basic and Clinical Physiology and Pharmacology
https://www.readbyqxmd.com/read/28034863/huang-me-ye-yc-chen-sr-et-al-use-of-all-trans-retinoic-acid-in-the-treatment-of-acute-promyelocytic-leukemia-blood-1988-72-2-567-572
#9
(no author information available yet)
No abstract text is available yet for this article.
December 29, 2016: Blood
https://www.readbyqxmd.com/read/27986845/unique-photosynthetic-phenotypes-in-portulaca-portulacaceae-c3-c4-intermediates-and-nad-me-c4-species-with-pilosoid-type-kranz-anatomy
#10
Elena V Voznesenskaya, Nuria K Koteyeva, Gerald E Edwards, Gilberto Ocampo
Portulacaceae is a family that has considerable diversity in photosynthetic phenotypes. It is one of 19 families of terrestrial plants where species having C4 photosynthesis have been found. Most species in Portulaca are in the alternate-leaved (AL) lineage, which includes one clade (Cryptopetala) with taxa lacking C4 photosynthesis and three clades having C4 species (Oleracea, Umbraticola and Pilosa). All three species in the Cryptopetala clade lack Kranz anatomy, the leaves have C3-like carbon isotope composition and they have low levels of C4 cycle enzymes...
January 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/27986635/electrophysiological-correlates-of-motion-extrapolation-an-investigation-on-the-cnv
#11
Luca Battaglini, Clara Casco, Bethany Rose Isaacs, David Bridges, Giorgio Ganis
Motion extrapolation (ME), the ability to estimate the current position of moving objects hidden by an occluder, is critical to interact with a dynamic environment. In a typical paradigm, participants estimate time to contact (TTC) by pressing a button when they estimate the occluded moving target reaches a certain cue. Research using this paradigm has shown that motion adaptation of the occluded area produces a shift in the TTC estimate (Gilden et al., 1995). We examined the effect of motion adaptation on the contingent negative variation (CNV), a frontal electrophysiological component (Tecce, 1972) that could reflect the activity of an accumulator (Buhusi and Meck, 2005) for time processing...
December 13, 2016: Neuropsychologia
https://www.readbyqxmd.com/read/27966728/structure-investigations-of-group-13-organometallic-carboxylates
#12
Iwona Justyniak, Daniel Prochowicz, Adam Tulewicz, Wojciech Bury, Piotr Goś, Janusz Lewiński
The octet-compliant group 13 organometallics with highly polarized bonds in the metal coordination sphere exhibit a significant tendency to maximize their coordination number through the formation of adducts with a wide range of neutral donor ligands or by self-association to give aggregates containing tetrahedral and higher coordinated aluminium centres, and even in some cases molecular complexes equilibrate with ionic species of different coordination numbers of the metal centre. This work provides a comprehensive overview of the structural chemistry landscape of the group 13 carboxylates...
December 14, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27960045/tell-me-how-do-you-define-person-centredness
#13
EDITORIAL
Jan Dewing, Brendan McCormack
The International Community of Practice for Person-centred Practice (PCP-ICoP) coordinated from Queen Margaret University Edinburgh recently wrote about the current state of person-centredness across several countries in the world (McCormack et al 2015). In that publication we highlighted a number of concerns, the existence of which are working against the advancement of person-centredness as a coherent theoretically informed and practice embedded framework for nursing. We believe that a focus on person-centredness provides an opportunity for nursing to rise above particular theoretical 'fan clubs' and work within a coherent set of principles that are multivariate, context non-specific and trans-specialist...
December 13, 2016: Journal of Clinical Nursing
https://www.readbyqxmd.com/read/27957691/speciation-and-precipitation-of-heavy-metals-in-high-metal-and-high-acid-mine-waters-from-the-iberian-pyrite-belt-portugal
#14
Nuno Durães, Iuliu Bobos, Eduardo Ferreira da Silva
Acid mine waters (AMW) collected during high- and low-flow water conditions from the Lousal, Aljustrel, and São Domingos mining areas (Iberian Pyrite Belt) were physicochemically analyzed. Speciation calculation using PHREEQC code confirms the predominance of Me(n+) and Me-SO4 species in AMW samples. Higher concentration of sulfate species (Me-SO4) than free ion species (Me(n+), i.e., Al, Fe, and Pb) were found, whereas opposite behavior is verified for Mg, Cu, and Zn. A high mobility of Zn than Cu and Pb was identified...
December 12, 2016: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/27927281/iron-fe-0-rich-substrate-based-on-iron-carbon-micro-electrolysis-for-phosphorus-adsorption-in-aqueous-solutions
#15
Shihai Deng, Desheng Li, Xue Yang, Wei Xing, Jinlong Li, Qi Zhang
The phosphorus (P) adsorption properties of an iron [Fe(0)]-rich substrate (IRS) composed of iron scraps and activated carbon were investigated based on iron-carbon micro-electrolysis (IC-ME) and compared to the substrates commonly used in constructed wetlands (CWs) to provide an initial characterization of the [Fe(0)]-rich substrate. The results showed that P was precipitated by Fe(III) dissolved from the galvanic cell reactions in the IRS and the reaction was suppressed by the pH and stopped when the pH exceeded 8...
February 2017: Chemosphere
https://www.readbyqxmd.com/read/27908496/mixed-mode-acrylamide-based-continuous-beds-bearing-tert-butyl-groups-for-capillary-electrochromatography-synthesized-via-complexation-of-n-tert-butylacrylamide-with-a-water-soluble-cyclodextrin-part-i-retention-properties
#16
Ayat Allah Al-Massaedh, Ute Pyell
With the aim to improve the understanding of morphology and efficiency properties, we investigate in this series the impact of the complex formation constant of the hydrophobic monomer with respect to statistically methylated-β-cyclodextrin (Me-β-CD) on the electrochromatographic properties of highly crosslinked amphiphilic mixed-mode acrylamide-based monolithic stationary phases. Based on our previous work on amphiphilic mixed-mode monolithic stationary phases for capillary electrochromatography (CEC) using N-(1-adamantyl)acrylamide (Ad-AAm) as hydrophobic monomer that forms an extremely strong water-soluble inclusion complex with Me-β-CD, we now selected N-tert-butylacrylamide (NTBA) as hydrophobic monomer forming an inclusion complex with Me-β-CD with a much lower value of the formation constant...
December 16, 2016: Journal of Chromatography. A
https://www.readbyqxmd.com/read/27882369/regio-and-stereo-selective-polymerization-of-1-3-butadiene-catalyzed-by-phosphorus-nitrogen-pn-3-pincer-cobalt-ii-complexes
#17
Dirong Gong, Xuequan Zhang, Kuo-Wei Huang
A new family of cobalt complexes (CoCl2-H, CoCl2-Me, CoCl2-iPr, CoBr2-H, CoBr2-Me, CoBr2-iPr, CoI2-H, CoI2-Me, and CoI2-iPr) supported by a PN(3) ligand (6-(N,N'-di-t-butylphosphino)-2-pyrazol-yl-aminopyridine) have been prepared and fully characterized by FT-IR, elemental analysis, and X-ray analysis. The X-ray analysis reveals a trigonal bipyramidal conformation in the solid state for all representative complexes, CoCl2-H, CoBr2-H, CoBr2-iPr and CoI2-Me. The cobalt center is chelated by the PN(3) ligand through the pyridinyl nitrogen, the pyrazol nitrogen and the phosphorus donor, with a long Co-P bond distance indicating a labile character...
December 6, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27792841/reactions-of-trimethylaluminium-modelling-the-chemical-degradation-of-synthetic-lubricants
#18
Jonathan Slaughter, Andrew J Peel, Andrew E H Wheatley
In investigating and seeking to mimic the reactivity of trimethylaluminium (TMA) with synthetic, ester-based lubricating oils, the reaction of methyl propionate 1 was explored with 1, 2 and 3 equivalents of the organoaluminium reagent. Spectroscopic analysis points to the formation of the adduct 1(TMA) accompanied only by the low level 1:1 production of Me2 AlOCEtMe2 2 and Me2 AlOMe 3 when an equimolar amount of TMA is applied. The deployment of excess TMA favours reaction to give 2 and 3 over 1(TMA) adduct formation and spectroscopy reveals that in hydrocarbon solution substitution product 2 traps unreacted TMA to yield 2(TMA)...
January 1, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27786290/mechanisms-on-the-morphology-variation-of-hematite-crystals-by-al-substitution-the-modification-of-fe-and-o-reticular-densities
#19
Wei Li, Xiaoliang Liang, Pengfei An, Xionghan Feng, Wenfeng Tan, Guohong Qiu, Hui Yin, Fan Liu
Al substitution in hematite is ubiquitous in soils. With the increase of Al amount, the hematite morphology changes from rhombohedral crystals to disk-shaped ones, but the underlying mechanism is poorly understood. Herein, a series of Al-substituted hematite were synthesized and characterized by synchrotron X-ray diffraction (SXRD), field emission scanning electron microscopy (FESEM), high resolution electron transmission microscopy (HRTEM) and extended X-ray absorption fine structure (EXAFS) spectroscopy, to investigate the effects of Al(3+) substitution on the hematite structure and morphology...
October 27, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27772565/validity-of-the-center-for-epidemiological-studies-depression-scale-in-type-2-diabetes
#20
Jasmine Carter, Hugo Cogo-Moreira, Nathan Herrmann, Daniel Merino, Pearl Yang, Baiju R Shah, Alex Kiss, Jaan Reitav, Paul I Oh, Walter Swardfager
OBJECTIVE: Depressive symptoms are common among people with Type 2 diabetes mellitus (T2DM). This study aimed to validate the 3-factor structure of the 14-item Center for Epidemiological Studies Depression (CES-D) scale proposed by Carleton et al. (2013) in a T2DM population. METHODS: The CES-D was administered to consecutive patients with T2DM entering a rehabilitation program. Construct validity was assessed using confirmatory factor analysis. Subscale viability, differential item functioning, and associations with clinical characteristics were tested in bifactor models...
November 2016: Journal of Psychosomatic Research
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