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https://www.readbyqxmd.com/read/28731572/endoscopic-surgical-technique-for-benign-fibrotic-strictures-of-the-upper-esophageal-sphincter
#1
Shun-Ichi Chitose, Kiminori Sato, Mioko Fukahori, Sachiyo Hamakawa, Akari Koga, Shintaro Sueyoshi, Hirohito Umeno
A 43-year-old man with complaints of increased difficulty of swallowing and weight loss underwent videofluorographic examination of swallowing, which revealed severely reduced cricopharyngeal opening. Endoscopic cricopharyngeal myotomy was performed using a modified technique (mECPM). A benign fibrotic stricture of the upper esophageal sphincter (UES) was identified under visualization of a distending operating laryngoscope. A vertical midline incision in the strictured mucosa and submucosal resection of the cricopharyngeal muscle were performed using a CO2 laser...
July 21, 2017: Digestive Endoscopy: Official Journal of the Japan Gastroenterological Endoscopy Society
https://www.readbyqxmd.com/read/28715251/body-heat-responsive-gelation-of-methylcellulose-formulation-containing-betaine
#2
Yoshiaki Shirata, Asami Wakasa, Kiyoshi Miura, Hironori Nakamura, Yoshinobu Matsumoto, Tomihiro Miyada
We examined a methylcellulose (MC) formulation that gels at body temperature for enteral alimentation. Betaine was found to have a lowering effect on the gelation temperature of the MC solution. The thermal gelation temperature of a body heat-responsive (BHR) gelling MC formulation, consisting of 2% MC, 15% glucose, 1.2% sodium citrate, and 3.5% betaine mixture, was approximately 32 °C, indicating that it could gel in response to body heat. Glucose release from the BHR gels was delayed at 37 °C in an in vitro study...
July 17, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/28715034/surface-chemistry-and-stability-of-metastable-corundum-type-in2o3
#3
Eva-Maria Köck, Michaela Kogler, Chen Zhuo, Lukas Schlicker, Maged F Bekheet, Andrew Doran, Aleksander Gurlo, Simon Penner
To account for the explanation of an eventual sensing and catalytic behavior of rhombohedral In2O3 (rh-In2O3) and the dependence of the metastability of the latter on gas atmospheres, in situ electrochemical impedance spectroscopic (EIS), Fourier-transform infrared spectroscopic (FT-IR), in situ X-ray diffraction and in situ thermogravimetric analyses in inert (helium) and reactive gases (hydrogen, carbon monoxide and carbon dioxide) have been conducted to link the gas-dependent electrical conductivity features and the surface chemical properties to its metastability towards cubic In2O3...
July 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28714254/microbial-biotechnology-addressing-the-plastic-waste-disaster
#4
Tanja Narancic, Kevin E O'Connor
Oceans are a major source of biodiversity, they provide livelihood, and regulate the global ecosystem by absorbing heat and CO2 . However, they are highly polluted with plastic waste. We are discussing here microbial biotechnology advances with the view to improve the start and the end of life of biodegradable polymers, which could contribute to the sustainable use of marine and coastal ecosystems (UN Sustainability development goal 14).
July 17, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28707806/selective-adsorption-and-separation-of-organic-dyes-with-spherical-polyelectrolyte-brushes-and-compressed-co2
#5
Rui Zhang, Zhenchuan Yu, Yuan Yao, Xiaoyan Hou, Qizhe Shen, Lei Wang, Xuhong Guo, Junwei Wang, Xuedong Zhu
Direct discharge of industry organic dyes has caused serious environmental pollution. Herein, we proposed a rational designed spherical polyelectrolyte brushes (SPB) with cationic charges, polystyrene-poly(2-aminoethylmethacrylate hydrochloride) (PS-PAEMH), as the absorbent and compressed carbon dioxide as the anti-solvent to separate the anionic dye, eosin Y (EY) from a solution of mixed dyes. The adsorption behavior of EY onto PS-PAEMH was highly dependent on CO2 pressure, contact time and initial concentration, and the maximum adsorption capacity of PS-PAEMH was 335...
July 14, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28688402/temperature-dependence-of-the-photodissociation-of-co2-from-high-vibrational-levels-205-230-nm-imaging-studies-of-co-x-1-%C3%AE-and-o-3-p-1-d-products
#6
S Sutradhar, B R Samanta, A K Samanta, H Reisler
The 205-230 nm photodissociation of vibrationally excited CO2 at temperatures up to 1800 K was studied using Resonance Enhanced Multiphoton Ionization (REMPI) and time-sliced Velocity Map Imaging (VMI). CO2 molecules seeded in He were heated in an SiC tube attached to a pulsed valve and supersonically expanded to create a molecular beam of rotationally cooled but vibrationally hot CO2. Photodissociation was observed from vibrationally excited CO2 with internal energies up to about 20 000 cm(-1), and CO(X(1)Σ(+)), O((3)P), and O((1)D) products were detected by REMPI...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28678479/closing-co2-loop-in-biogas-production-recycling-ammonia-as-fertilizer
#7
Qingyao He, Ge Yu, Te Tu, Shuiping Yan, Yanlin Zhang, Shuaifei Zhao
We propose and demonstrate a novel system for simultaneous ammonia recovery, carbon capture, biogas upgrading, and fertilizer production in biogas production. Biogas slurry pretreatment (adjusting the solution pH, turbidity, and chemical oxygen demand) plays an important role in the system as it significantly affects the performance of ammonia recovery. Vacuum membrane distillation is used to recover ammonia from biogas slurry at various conditions. The ammonia removal efficiency in vacuum membrane distillation is around 75% regardless of the ammonia concentration of the biogas slurry...
July 18, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28661338/colloidal-chemistry-to-advance-studies-in-artificial-photosynthesis
#8
Raffaella Buonsanti
This article presents an overview of our research in the field of colloidal nanocrystal synthesis and their implementation into water splitting and CO2 reduction electrochemical cells. We discuss our approaches to tailor-made novel material platforms to advance our knowledge in energy storage in chemical bonds, namely artificial photosynthesis. Herein, we focus on complex metal oxides as light absorbers to drive water splitting, nanocrystal hybrids and metals as electrocatalysts for carbon dioxide conversion...
November 30, 2016: Chimia
https://www.readbyqxmd.com/read/28661230/circle-co2-reabsorbing-breathing-systems-human-applications
#9
Patrick Magee
Artificial breathing systems to help humans survive extreme environments are used over a range of ambient pressures, using various gases of different volumetric concentrations. These activities include anaesthesia and intensive care activity, high-altitude mountaineering, firefighting, aerospace extravehicular space activity and underwater diving operations. A circle breathing system is one in which the exhaled carbon dioxide is absorbed by an alkali substance and the remaining unused gases are recirculated, usually for the sake of economy and environment...
July 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28654267/ternary-silver-halide-nanocrystals
#10
Sasitha C Abeyweera, Kowsalya D Rasamani, Yugang Sun
Nanocrystalline silver halides (AgX) such as AgCl, AgBr, and AgI, a class of semiconductor materials with characteristics of both direct and indirect band gaps, represent the most crucial components in traditional photographic processing. The nanocrystal surfaces provide sensitivity specks that can turn into metallic silver, forming an invisible latent image, upon exposure to light. The photographic processing implies that the AgX nanoparticles possess unique properties. First, pristine AgX nanoparticles absorb light only at low efficiency to convert surface AgX into tiny clusters of silver atoms...
June 27, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28640914/kinetic-analysis-of-an-anion-exchange-absorbent-for-co2-capture-from-ambient-air
#11
Xiaoyang Shi, Qibin Li, Tao Wang, Klaus S Lackner
This study reports a preparation method of a new moisture swing sorbent for CO2 capture from air. The new sorbent components include ion exchange resin (IER) and polyvinyl chloride (PVC) as a binder. The IER can absorb CO2 when surrounding is dry and release CO2 when surrounding is wet. The manuscript presents the studies of membrane structure, kinetic model of absorption process, performance of desorption process and the diffusivity of water molecules in the CO2 absorbent. It has been proved that the kinetic performance of CO2 absorption/desorption can be improved by using thin binder and hot water treatment...
2017: PloS One
https://www.readbyqxmd.com/read/28624742/ionic-liquids-toxicity-on-fresh-water-microalgae-scenedesmus-quadricauda-chlorella-vulgaris-botryococcus-braunii-selection-criterion-for-use-in-a-two-phase-partitioning-bioreactor-tppbr
#12
Khurrum Shehzad Quraishi, Mohamad Azmi Bustam, Sooridarsan Krishnan, Noor Fathanah Aminuddin, Noraisyah Azeezah, Noraini Abd Ghani, Yoshimitsu Uemura, Jean Marc Lévêque
A promising method of Carbon dioxide (CO2) valorization is to use green microalgae photosynthesis to process biofuel. Two Phase Partitioning Bioreactors (TPPBR) offer the possibility to use non-aqueous phase liquids (NAPL) to enhance CO2 solubility; thus making CO2 available to maximize algae growth. This requires relatively less toxic hydrophobic Ionic Liquids (ILs) that comprise a new class of ionic compounds with remarkable physicochemical properties and thus qualifies them as NAPL candidates. This paper concerns the synthesis of ILs with octyl and butyl chains as well as different cations containing aromatic (imidazolium, pyridinium) and non-aromatic (piperidinum, pyrrolidinium) rings for CO2 absorption studies...
June 12, 2017: Chemosphere
https://www.readbyqxmd.com/read/28608900/theoretical-and-experimental-studies-on-three-water-stable-isostructural-paddlewheel-based-semiconducting-metal-organic-frameworks
#13
Xiaowei Yang, Yuan Zhang, Feng Li, Tiantian Guo, Yong Wu, Fengyan Jin, Min Fang, Yaqian Lan, Yafei Li, Yong Zhou, Zhigang Zou
Three water-stable isostructural metal-organic frameworks (MOFs) of the general formula [M2(TCS)(BPY)] (M = Co(1), Ni(2) and Cu(3); H4TCS = tetrakis(4-carboxyphenyl) silane, BPY = 4,4'-bipyridine) were synthesized and fully characterized. MOFs 1-3 are stable in pH = 5-11, 2-11, 3-11 aqueous solution respectively for at least 24 h at room temperature. Although H4TCS absorbs only UV light, MOFs 1-3 absorb both UV and visible light in broad ranges (250-800 nm) and absorb more visible light than the ligand BPY...
June 27, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28608682/powering-a-co2-reduction-catalyst-with-visible-light-through-multiple-sub-picosecond-electron-transfers-from-a-quantum-dot
#14
Shichen Lian, Mohamad S Kodaimati, Dmitriy S Dolzhnikov, Raul Calzada, Emily A Weiss
Photosensitization of molecular catalysts to reduce CO2 to CO is a sustainable route to storable solar fuels. Crucial to the sensitization process is highly efficient transfer of redox equivalents from sensitizer to catalyst; in systems with molecular sensitizers, this transfer is often slow because it is gated by diffusion-limited collisions between sensitizer and catalyst. This article describes the photosensitization of a meso-tetraphenylporphyrin iron(III) chloride (FeTPP) catalyst by colloidal, heavy metal-free CuInS2/ZnS quantum dots (QDs) to reduce CO2 to CO using 450 nm light...
June 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28599706/quantitative-chiral-analysis-of-amino-acids-in-solution-using-enantiomer-selective-photodissociation-of-cold-gas-phase-tryptophan-via-chiral-recognition
#15
Akimasa Fujihara, Naoto Maeda
To explore the origin of biomolecule homochirality in interstellar molecular clouds, enantiomer-selective photodissociation via chiral recognition between amino acids in the gas phase was examined using a tandem mass spectrometer containing an electrospray ionization source and a cold ion trap. Ultraviolet photodissociation mass spectra of cold gas-phase noncovalent complexes of sodiated l-tryptophan ion, Na(+)(l-Trp), with an amino acid such as serine (Ser), threonine (Thr), or alanine (Ala) were obtained by the photo-excitation of l-Trp in the noncovalent complexes...
August 1, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28581705/characteristics-of-nano3-promoted-cdo-as-a-midtemperature-co2-absorbent
#16
Kang-Yeong Kim, Jin-Su Kwak, Young-In An, Kyung-Ryul Oh, Young-Uk Kwon
In this study, we explored the reaction system CdO(s) + CO2(g) ⇄ CdCO3(s) as a model system for CO2 capture agent in the intermediate temperature range of 300-400 °C. While pure CdO does not react with CO2 at all up to 500 °C, CdO mixed with an appropriate amount of NaNO3 (optimal molar ratio NaNO3/CdO = 0.14) greatly enhances the conversion of CdO into CdCO3 up to ∼80% (5.68 mmol/g). These NaNO3-promoted CdO absorbents can undergo many cycles of absorption and desorption by temperature swing between 300 and 370 °C under a 100% CO2 condition...
June 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28575237/inside-out-efflux-of-carbon-dioxide-from-leaves-represents-more-than-leaf-metabolism
#17
Samantha S Stutz, Jeremiah Anderson, Rachael Zulick, David T Hanson
High concentrations of inorganic carbon in the xylem, produced from root, stem, and branch respiration, travel via the transpiration stream and eventually exit the plant through distant tissues as CO2. Unlike previous studies that focused on the efflux of CO2 from roots and woody tissues, we focus on efflux from leaves and the potential effect on leaf respiration measurements. We labeled transported inorganic carbon, spanning reported xylem concentrations, with 13C and then manipulated transpiration rates in the dark in order to vary the rates of inorganic carbon supply to cut leaves from Brassica napus and Populus deltoides...
May 30, 2017: Journal of Experimental Botany
https://www.readbyqxmd.com/read/28562020/evaluation-and-modeling-of-vapor-liquid-equilibrium-and-co2-absorption-enthalpies-of-aqueous-designer-diamines-for-post-combustion-capture-processes
#18
Weiliang Luo, Qi Yang, William Conway, Graeme Puxty, Paul Feron, Jian Chen
Novel absorbents with improved characteristics are required to reduce the existing cost and environmental barriers to deployment of large scale CO2 capture. Recently, bespoke absorbent molecules have been specifically designed for CO2 capture applications, and their fundamental properties and suitability for CO2 capture processes evaluated. From the study, two unique diamine molecules, 4-(2-hydroxyethylamino)piperidine (A4) and 1-(2-hydroxyethyl)-4-aminopiperidine (C4), were selected for further evaluation including thermodynamic characterization...
June 12, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28551365/low-dose-ionizing-radiation-limitations-to-seed-germination-results-from-a-model-linking-physiological-characteristics-and-developmental-dynamics-simulation-strategy
#19
Hui Liu, Dawei Hu, Chen Dong, Yuming Fu, Guanghui Liu, Youcai Qin, Yi Sun, Dianlei Liu, Lei Li, Hong Liu
There is much uncertainty about the risks of seed germination after repeated or protracted environmental low-dose ionizing radiation exposure. The purpose of this study is to explore the influence mechanism of low-dose ionizing radiation on wheat seed germination using a model linking physiological characteristics and developmental-dynamics simulation. A low-dose ionizing radiation environment simulator was built to investigate wheat (Triticum aestivum L.) seeds germination process and then a kinetic model expressing the relationship between wheat seed germination dynamics and low-dose ionizing radiation intensity variations was developed by experimental data, plant physiology, relevant hypotheses and system dynamics, and sufficiently validated and accredited by computer simulation...
May 24, 2017: Journal of Theoretical Biology
https://www.readbyqxmd.com/read/28537771/atmospheric-constraints-on-the-surface-uv-environment-of-mars-at-3-9%C3%A2-ga-relevant-to-prebiotic-chemistry
#20
Sukrit Ranjan, Robin Wordsworth, Dimitar D Sasselov
Recent findings suggest that Mars may have been a clement environment for the emergence of life and may even have compared favorably to Earth in this regard. These findings have revived interest in the hypothesis that prebiotically important molecules or even nascent life may have formed on Mars and been transferred to Earth. UV light plays a key role in prebiotic chemistry. Characterizing the early martian surface UV environment is key to understanding how Mars compares to Earth as a venue for prebiotic chemistry...
May 24, 2017: Astrobiology
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