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https://www.readbyqxmd.com/read/28531450/estimating-energy-expenditure-in-vascular-surgery-patients-are-predictive-equations-accurate-enough
#1
J Suen, J M Thomas, C L Delaney, J I Spark, M D Miller
BACKGROUND & AIMS: Malnutrition is prevalent in vascular surgical patients who commonly seek tertiary care at advanced stages of disease. Adjunct nutrition support is therefore pertinent to optimise patient outcomes. To negate consequences related to excessive or suboptimal dietary energy intake, it is essential to accurately determine energy expenditure and subsequent requirements. This study aims to compare resting energy expenditure (REE) measured by indirect calorimetry, a commonly used comparator, to REE estimated by predictive equations (Schofield, Harris-Benedict equations and Miller equation) to determine the most suitable equation for vascular surgery patients...
December 2016: Clinical Nutrition ESPEN
https://www.readbyqxmd.com/read/28530810/seleniranium-ions-undergo-%C3%AF-ligand-exchange-via-an-associative-mechanism-in-the-gas-phase
#2
Shea Fern Lim, Benjamin Leigh Harris, George N Khairallah, Evan John Bieske, Philippe Maître, Gabriel da Silva, Brian D Adamson, Michael S Scholz, Neville J A Coughlan, Richard A J O'Hair, Michael Rathjen, Daniel Stares, Jonathan M White
Collision-induced dissociation mass spectrometry of the ammonium ions 4a and 4b results in the formation of the seleniranium ion 5, the structure and purity of which was verified using gas phase infra-red spectroscopy coupled to mass spectrometry, and gas phase ion-mobility measurements. Ion-molecule reactions between the ion 5 (m/z = 261) and cyclopentene, cyclohexene, cycloheptene and cyclooctene, resulted in the formation of the seleniranium ions 7 (m/z = 225), 6 (m/z = 239), 8 (m/z = 253), and 9 (m/z = 267) respectively...
May 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28530476/time-trials-versus-time-to-exhaustion-tests-effects-on-critical-power-w-and-oxygen-uptake-kinetics
#3
Bettina Karsten, Jonathan Baker, Fernando Naclerio, Andreas Klose, Antonino Bianco, Alfred Nimmerichter
PURPOSE: To investigate single-day time-to-exhaustion (TTE) and time trial (TT) based laboratory tests values of critical power (CP), Wprime (W') and respective oxygen kinetics responses. METHODS: Twelve cyclists performed a maximal ramp test followed by three TTE and three TT efforts interspersed by a 60-min recovery between efforts. Oxygen uptake was measured during all trials. The mean response time (MRT) was calculated as a description of the overall V̇O2 kinetic response from the onset to 2 min of exercise...
May 22, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28527738/life-cycle-assessment-of-sustainable-raw-material-acquisition-for-functional-magnetite-bionanoparticle-production
#4
Jhuma Sadhukhan, Nimisha Joshi, Mobolaji Shemfe, Jonathan R Lloyd
Magnetite nanoparticles (MNPs) have several applications, including use in medical diagnostics, renewable energy production and waste remediation. However, the processes for MNP production from analytical-grade materials are resource intensive and can be environmentally damaging. This work for the first time examines the life cycle assessment (LCA) of four MNP production cases: (i) industrial MNP production system; (ii) a state-of-the-art MNP biosynthesis system; (iii) an optimal MNP biosynthesis system and (iv) an MNP biosynthesis system using raw materials sourced from wastewaters, in order to recommend a sustainable raw material acquisition pathway for MNP synthesis...
May 17, 2017: Journal of Environmental Management
https://www.readbyqxmd.com/read/28527443/competition-between-weak-oh%C3%A2-%C3%AF-and-ch%C3%A2-o-hydrogen-bonds-thz-spectroscopy-of-the-c2h2-h2o-and-c2h4-h2o-complexes
#5
J Andersen, J Heimdal, B Nelander, R Wugt Larsen
THz absorption spectra have been recorded for the weakly bound molecular complexes of H2O with C2H4 and C2H2 embedded in cryogenic neon matrices at 2.8 K. The observation and assignment of a large-amplitude acceptor OH librational mode of the C2H2-H2O complex at 145.5 cm(-1) confirms an intermolecular CH⋯O hydrogen-bonded configuration of C2v symmetry with the H2O subunit acting as the hydrogen bond acceptor. The observation and assignment of two large-amplitude donor OH librational modes of the C2H4-H2O complex at 255...
May 21, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28524800/swelling-mechanism-of-urea-crosslinked-starch-lignin-films-in-water
#6
Ariyanti Sarwono, Zakaria Man, M Azmi Bustam, Duvvuri Subbarao, Alamin Idris, Nawshad Muhammad, Amir Sada Khan, Zahoor Ullah
Coating fertilizer particles with thin films is a possibility to control the fertilizer release rates. It is observed that novel urea crosslinked starch-lignin composite thin films, prepared by solution casting, swell on coming into contact with water due to increase in volume by water uptake diffusion. The effect of lignin content, varied from 0% to 20% in steps of 5% and three different temperatures (25°C, 35°C and 45°C) on swelling of the film was investigated. By gravimetric analysis, the equilibrium water uptake and diffusion coefficient decrease with lignin content indicating that the addition of lignin increases the hydrophobicity of the films...
May 19, 2017: Environmental Technology
https://www.readbyqxmd.com/read/28524679/transition-from-collisional-to-collisionless-regimes-in-interpenetrating-plasma-flows-on-the-national-ignition-facility
#7
J S Ross, D P Higginson, D Ryutov, F Fiuza, R Hatarik, C M Huntington, D H Kalantar, A Link, B B Pollock, B A Remington, H G Rinderknecht, G F Swadling, D P Turnbull, S Weber, S Wilks, D H Froula, M J Rosenberg, T Morita, Y Sakawa, H Takabe, R P Drake, C Kuranz, G Gregori, J Meinecke, M C Levy, M Koenig, A Spitkovsky, R D Petrasso, C K Li, H Sio, B Lahmann, A B Zylstra, H-S Park
A study of the transition from collisional to collisionless plasma flows has been carried out at the National Ignition Facility using high Mach number (M>4) counterstreaming plasmas. In these experiments, CD-CD and CD-CH planar foils separated by 6-10 mm are irradiated with laser energies of 250 kJ per foil, generating ∼1000  km/s plasma flows. Varying the foil separation distance scales the ion density and average bulk velocity and, therefore, the ion-ion Coulomb mean free path, at the interaction region at the midplane...
May 5, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28523654/a-ph-switch-for-%C3%AE-sheet-protein-folding
#8
Jordan M Anderson, Niels H Andersen
Protein design advancements have led to biotechnological strategies based on more stable and more specific structures. Herein we present a 6-residue sequence (HPATGK) that acts as a stable structure-nucleating turn at physiological and higher pH but is notably unfavorable for chain direction reversal at low pH. When placed into the turn of a β-sheet, this leads to a pH switch of folding. Using a standard 3-stranded β-sheet model, the WW domain, it was found that the pH switch sequence insertion caused minimal change at pH 8 but a ca...
May 19, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28521086/a-computational-exploration-of-h2s-and-co2-capture-by-ionic-liquids-based-on-%C3%AE-amino-acid-anion-and-n7-n9-dimethyladeninium-cation
#9
Badrosadat Seyedhosseini, Mohammad Izadyar, Mohammad Reza Housaindokht
Hydrogen sulfide (H2S) and carbon dioxide (CO2) adsorption on a series of the aliphatic amino acid ionic liquids (AAILs) composed of N7,N9- dimethyladeninium cation with amino acid anions (AA= Gly, Ala, Val, Leu and Ile) as the functionalized ILs with dual groups of amine have been investigated. Based on the obtained data, the possible sites of H2S adsorption are twice as CO2 on the ionic liquids and also the average adsorption energy of H2S (∆E=-51.5 kJ.mol-1) in the most stable region of adsorption is twice greater than that of CO2 (∆E=-25...
May 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28521049/22q11-2-deletion-syndrome-is-associated-with-impaired-auditory-steady-state-gamma-response
#10
Kit Melissa Larsen, Giovanni Pellegrino, Michelle Rosgaard Birknow, Trine Nørgaard Kjær, William Frans Christiaan Baaré, Michael Didriksen, Line Olsen, Thomas Werge, Morten Mørup, Hartwig Roman Siebner
Background: The 22q11.2 deletion syndrome confers a markedly increased risk for schizophrenia. 22q11.2 deletion carriers without manifest psychotic disorder offer the possibility to identify functional abnormalities that precede clinical onset. Since schizophrenia is associated with a reduced cortical gamma response to auditory stimulation at 40 Hz, we hypothesized that the 40 Hz auditory steady-state response (ASSR) may be attenuated in nonpsychotic individuals with a 22q11.2 deletion...
May 17, 2017: Schizophrenia Bulletin
https://www.readbyqxmd.com/read/28520474/survival-of-deinococcus-geothermalis-in-biofilms-under-desiccation-and-simulated-space-and-martian-conditions
#11
Jan Frösler, Corinna Panitz, Jost Wingender, Hans-Curt Flemming, Petra Rettberg
Biofilm formation represents a successful survival strategy for bacteria. In biofilms, cells are embedded in a matrix of extracellular polymeric substances (EPS). As they are often more stress-tolerant than single cells, biofilm cells might survive the conditions present in space and on Mars. To investigate this topic, the bacterium Deinococcus geothermalis was chosen as a model organism due to its tolerance toward desiccation and radiation. Biofilms cultivated on membranes and, for comparison, planktonically grown cells deposited on membranes were air-dried and exposed to individual stressors that included prolonged desiccation, extreme temperatures, vacuum, simulated martian atmosphere, and UV irradiation, and they were exposed to combinations of stressors that simulate space (desiccation + vacuum + UV) or martian (desiccation + Mars atmosphere + UV) conditions...
May 2017: Astrobiology
https://www.readbyqxmd.com/read/28516406/degradation-and-adsorption-of-tralkoxydim-in-chinese-soils-and-water-sediment-environments
#12
Wen Zhu Wu, Zheng Jun Shan, De Yang Kong, Jian He
Tralkoxydim is a cyclohexanedione herbicide primarily used for gramineous weed control in China. In this paper, we present results of a tralkoxydim laboratory environmental fate study characterizing its degradation, adsorption, and mobility behavior in three different soils and two water-sediment systems (river and lake) in China. Degradation half-life of tralkoxydim in soil under aerobic conditions was 5.1, 7.7, and 7.9 days in Jiangxi red soil, Taihu paddy soil, and Northeast China black soil, respectively...
June 2017: Environmental Monitoring and Assessment
https://www.readbyqxmd.com/read/28514876/potential-support-ratios-cohort-versus-period-perspectives
#13
Søren Kjærgaard, Vladimir Canudas-Romo
The 'prospective potential support ratio' has been proposed by researchers as a measure that accurately quantifies the burden of ageing, by identifying the fraction of a population that has passed a certain measure of longevity, for example, 17 years of life expectancy. Nevertheless, the prospective potential support ratio usually focuses on the current mortality schedule, or period life expectancy. Instead, in this paper we look at the actual mortality experienced by cohorts in a population, using cohort life tables...
May 18, 2017: Population Studies
https://www.readbyqxmd.com/read/28514721/impact-of-gh-administration-on-athletic-performance-in-healthy-young-adults-a-systematic-review-and-meta-analysis-of-placebo-controlled-trials
#14
REVIEW
Kasper Hermansen, Mads Bengtsen, Michael Kjær, Peter Vestergaard, Jens Otto Lunde Jørgensen
OBJECTIVE: Illicit use of growth hormone (GH) as a performance-enhancing drug among athletes is prevalent, although the evidence of such effects in healthy, young subjects is sparse. We therefore performed a meta-analysis of published studies on the effect of GH administration on body composition, substrate metabolism, and athletic performance in healthy, young subjects. DESIGN: The English-language based databases PubMed, EMBASE, and Cochrane Central Register of Controlled Trials were searched, and eligible articles were reviewed in accordance with the PRISMA guidelines...
May 10, 2017: Growth Hormone & IGF Research
https://www.readbyqxmd.com/read/28514153/efficient-dlpno-ccsd-t-based-estimation-of-formation-enthalpies-for-c-h-o-and-n-containing-closed-shell-compounds-validated-against-critically-evaluated-experimental-data
#15
Eugene Paulechka, Andrei Kazakov
An accurate and cost-efficient methodology for the estimation of the enthalpies of formation for closed-shell compounds composed of C, H, O, and N atoms is presented and validated against critically-evaluated experimental data. The computational efficiency is achieved through the use of the Resolution-of-Identity (RI) and Domain-Based Local Pair-Natural Orbital Coupled Cluster (DLPNO-CCSD(T)) approximations, which results in drastic reduction in both the computational cost and the number of necessary steps for a composite quantum chemical method...
May 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28513302/controlled-release-of-1-methylcyclopropene-from-its-functionalized-electrospun-fibers-under-constant-and-linearly-ramped-humidity
#16
Tze Loon Neoh, Hermawan Dwi Ariyanto, Patricia Menendez Galvan, Hidefumi Yoshii
The methodology to electrospin polystyrene (PS) fibers functionalized with the inclusion complex between 1-methylcyclopropene and α-cyclodextrin (α-CD) has been developed successfully. Due to limited availability, α-CD crystals instead of 1-MCP/α-CD complex were suspended in the electrospinning (ES) solutions to investigate the electrospinning process. The ES solutions were characterized in terms of viscosity, conductivity and surface tension. Meanwhile the fibers were subjected to scanning electron microscopy...
May 17, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28512717/infrared-laser-ablation-sample-transfer-of-tissue-dna-for-genomic-analysis
#17
Kelin Wang, Fabrizio Donnarumma, Scott W Herke, Patrick F Herke, Kermit K Murray
Infrared (IR) laser ablation was used to remove material from tissue sections mounted on microscope slides, with subsequent capture in a solvent-containing microcentrifuge tube. Experiments conducted with a 3200-bp double-stranded plasmid DNA template demonstrated IR-laser ablation transfer of intact DNA. The transfer efficiency and the molecular integrity of the captured DNA were evaluated using Sanger sequencing, gel electrophoresis, and fluorimetric analysis. The plasmid DNA was reproducibly transferred with an efficiency of 59 ± 3% at laser fluences of between 10 and 20 kJ/m(2) at a wavelength of 3 μm...
May 17, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28511195/safety-aspects-of-postanesthesia-care-unit-discharge-without-motor-function-assessment-after-spinal-anesthesia-a-randomized-multicenter-semiblinded-noninferiority-controlled-trial
#18
Eske Kvanner Aasvang, Christoffer Calov Jørgensen, Mogens Berg Laursen, Jacob Madsen, Søren Solgaard, Mogens Krøigaard, Per Kjærsgaard-Andersen, Hans Mandøe, Torben Bæk Hansen, Jørgen Ulrich Nielsen, Niels Krarup, Annette Elisabeth Skøtt, Henrik Kehlet
BACKGROUND: Postanesthesia care unit (PACU) discharge without observation of lower limb motor function after spinal anesthesia has been suggested to significantly reduce PACU stay and enhance resource optimization and early rehabilitation but without enough data to allow clinical recommendations. METHODS: A multicenter, semiblinded, noninferiority randomized controlled trial of discharge from the PACU with or without assessment of lower limb motor function after elective total hip or knee arthroplasty under spinal anesthesia was undertaken...
June 2017: Anesthesiology
https://www.readbyqxmd.com/read/28510305/reactive-precipitation-of-anhydrous-alkali-sulfide-nanocrystals-with-concomitant-abatement-of-hydrogen-sulfide-and-co-generation-of-hydrogen
#19
Yongan Yang, Xuemin Li, Yangzhi Zhao, Alice Brennan, Miranda McCeig, Colin A Wolden
Anhydrous alkali sulfide (M2S, M = Li and Na) nanocrystals (NCs) are important materials central to the development of next generation cathodes and solid state electrolytes for advanced batteries, but not commercially available at present. This work reports an innovative method to directly synthesize M2S-NCs through alcohol-mediated reactions between alkali metals and hydrogen sulfide (H2S). In the first step, the alkali metal is complexed with alcohol in solution, forming metal alkoxide (ROM) and releasing hydrogen (H2)...
May 16, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28509430/trapping-co2-by-adduct-formation-with-nhc-s-a-theoretical-study
#20
Ibon Alkorta, Maria de la Merced Montero-Campillo, José Elguero
Carbon dioxide can form compounds with nitrogen heterocyclic carbenes (NHC) based on azoles through non-covalent interactions or by covalent bonding. It has been observed a narrow dependence between the preference for one or another type of bonding and the carbene structure, as revealed by a series of physicochemical descriptors. In our survey, a set of NHC based on azole family (three classical, three abnormal and one remote) was shown to bind CO2 at the accurate G4MP2 computational level. In most cases, exothermic reaction profiles towards the covalently bound form were found, reaching stabilization enthalpies up to -77 kJ·mol-1 for the remote carbene case...
May 16, 2017: Chemistry: a European Journal
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