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1. A novel voltammetry offline coupled MALDI/TOF MS characterization of electrochemical reaction products and the voltammetric determination of febuxostat in human plasma

Author:
El-Yazbi, Fawzi A.; Amin, Omayma A.; Bakry, Rania; Khamis, Essam F.; El-Kimary, Eman I.; Younis, Sameh E.
Source:
Talanta 2019 v.194 pp. 542-547
ISSN:
0039-9140
Subject:
acetates,   etc   ; drugs; electrochemistry; humans; pH;     Show all 5 Subjects
Abstract:
... A simple offline coupling voltammetry-MALDI/TOF MS procedure is presented for studying electrochemical reactions. It was utilized for the characterization of the electro-reduction products of febuxostat in methanolic acetate buffer (0.1 M, pH 5). The MS analysis reveals that the carboxylic and nitrile groups are the electro-reducible groups at −0.9338 and −1.5503 V with the conversion to aldehydic ...
DOI:
10.1016/j.talanta.2018.10.087

2. Exceptional solvent tolerance in Yarrowia lipolytica is enhanced by sterols

Author:
Walker, Caleb; Ryu, Seunghyun; Trinh, Cong T.
Source:
Metabolic engineering 2019 v.54 pp. 83-95
ISSN:
1096-7176
Subject:
acetates,   etc   ; Yarrowia lipolytica; ionic liquids; sterols; yeasts;     Show all 5 Subjects
Abstract:
... Green organic solvents such as ionic liquids (ILs) have versatile use but are inhibitory to microbes even at low concentrations of 0.5–1.0% (v/v) ILs. We discovered the oleaginous yeast Yarrowia lipolytica can grow in 10% (v/v) of 1-ethyl-3-methylimidazolium acetate ([EMIM][OAc]), which makes it more tolerant than most engineered microorganisms and naturally screened isolates. However, the underly ...
DOI:
10.1016/j.ymben.2019.03.003

3. Identification of the Reaction Sequence of the MTO Initiation Mechanism Using Ab Initio-Based Kinetics

Author:
Plessow, Philipp N.; Smith, Ashley; Tischer, Steffen; Studt, Felix
Source:
Journal of the American Chemical Society 2019 v.141 no.14 pp. 5908-5915
ISSN:
1520-5126
Subject:
acetates,   etc   ; chemical bonding; dehydrogenation; methanol; models; olefin;     Show all 6 Subjects
Abstract:
... The initiation of the methanol-to-olefins (MTO) process is investigated using a multiscale modeling approach where more than 100 ab initio computed (MP2:DFT) rate constants for H-SSZ-13 are used in a batch reactor model. The investigated reaction network includes the mechanism for initiation (42 steps) and a representative part of the autocatalytic olefin cycle (63 steps). The simulations unravel ...
DOI:
10.1021/jacs.9b00585

4. Evaluation of bulk compression using a discrete element procedure calibrated with data from triaxial compression experiments on single particles

Author:
Jonsson, Henrik; Alderborn, Göran; Frenning, Göran
Source:
Powder technology 2019 v.345 pp. 74-81
ISSN:
0032-5910
Subject:
cellulose acetate,   etc   ; equations; mathematical models; powders; prediction;     Show all 5 Subjects
Abstract:
... Confined compression of bimodal mixtures of nearly monodisperse spherical cellulose acetate (CA) particles (diameters 1.5 and 2.0 mm) was studied numerically with the discrete element method (DEM) and experimentally using a materials tester equipped with suitable tablet tooling. An extended truncated sphere contact model was used in the simulations, enabling them to be carried out to high relative ...
DOI:
10.1016/j.powtec.2018.12.090

5. A facile strategy for high performance recyclable polymer systems via dynamic metal ion crosslinking

Author:
Wang, Yanjun; Liu, Zhimeng; Zhou, Changlin; Yuan, Ye; Jiang, Liang; Wu, Bo; Lei, Jingxin
Source:
Journal of materials chemistry A 2019 v.7 no.8 pp. 3577-3582
ISSN:
2050-7496
Subject:
zinc acetate,   etc   ; chemical bonding; crosslinking; thermoplastics; zinc;     Show all 5 Subjects
Abstract:
... A facile strategy of incorporating dynamic carboxylic zinc ion interactions into traditional linear polymers was developed to achieve the recyclability of crosslinked polymers. For newly synthesized polymers, pendant carboxyl can be incorporated into polymer chains during the synthesis process and subsequently crosslinked with zinc acetate. For commercial thermoplastics with only C–C bonds in the ...
DOI:
10.1039/c8ta11866c

6. Cascade Reaction of Morita–Baylis–Hillman Acetates with 1,1-Enediamines or Heterocyclic Ketene Aminals: Synthesis of Highly Functionalized 2-Aminopyrroles

Author:
Liu, Jin; Li, Qi; Cao, Zheng-Mao; Jin, Yi; Lin, Jun; Yan, Sheng-Jiao
Source:
Journal of organic chemistry 2019 v.84 no.4 pp. 1797-1807
ISSN:
1520-6904
Subject:
acetates,   etc   ; aromatization; chemical structure; organic chemistry; pyrroles;     Show all 5 Subjects
Abstract:
... A new strategy for the construction of two kinds of fully substituted pyrroles, including 2-aminopyrroles and bicyclic pyrroles from Morita–Baylis–Hillman (MBH) acetates with 1,1-enediamines (EDAMs), or heterocyclic ketene aminals (HKAs) via base-promoted tandem Michael addition, elimination, and aromatization sequence has been developed, affording the expected products in moderate to excellent yi ...
DOI:
10.1021/acs.joc.8b02594

7. A Passerini/Tsuji-Trost access to dienamide derivatives

Author:
Youcef, Sihem Dali; Kerim, Mansour Dolè; Ilitki, Hocine; El Kaïm, Laurent
Source:
Tetrahedron letters 2019 v.60 no.2 pp. 102-105
ISSN:
0040-4039
Subject:
acetates,   etc   ; aldehydes; chemical structure; cycloaddition reactions;     Show all 4 Subjects
Abstract:
... The Passerini reaction of α, β-unsaturated aldehydes affords allylic acetates which may be involved in Tsuji-Trost elimations towards conjugated dienamides. The interest of these 2,4-dienamides has been demonstrated in several TiCl4 triggered Diels-Alder reactions with N-phenylmaleimide. ...
DOI:
10.1016/j.tetlet.2018.11.068

8. Study on the thermal risk of the ethylene-vinyl acetate bulk copolymerization

Author:
Sun, Feng; Wang, Guangjian
Source:
Thermochimica acta 2019 v.671 pp. 54-59
ISSN:
0040-6031
Subject:
ethylene-vinyl acetate,   etc   ; copolymerization; heat; industrialization; risk;     Show all 5 Subjects
Abstract:
... The bulk copolymerizaition is an effective method to produce ethylene-vinyl acetate (EVA) copolymer. In this paper, the thermal risk of the EVA copolymerization was studied using vent size package 2 (VSP2) in order to avoid thermal runaway of the reaction. The effect of pressure, residence time, initiator concentration and heat input on the runaway reaction under adiabatic condition was investigat ...
DOI:
10.1016/j.tca.2018.11.007

9. New, Effective, and Low-Cost Dual-Functional Binder for Porous Silicon Anodes in Lithium-Ion Batteries

Author:
Guo, Rongnan; Zhang, Shunlong; Ying, Hangjun; Yang, Wentao; Wang, Jianli; Han, Wei-Qiang
Source:
ACS applied materials & interfaces 2019 v.11 no.15 pp. 14051-14058
ISSN:
1944-8252
Subject:
acetates; ethylene-vinyl acetate,   etc   ; anodes; colloids; electrolytes; latex; lithium batteries; mixing; moieties; polyacrylic acid; silicon;     Show all 11 Subjects
Abstract:
... In this work, a new effective and low-cost binder applied in porous silicon anode is designed through blending of low-cost poly(acrylic acid) (PAA) and poly(ethylene-co-vinyl acetate) (EVA) latex (PAA/EVA) to avoid pulverization of electrodes and loss of electronic contact because of huge volume changes during repeated charge/discharge cycles. PAA with a large number of carboxyl groups offers stro ...
DOI:
10.1021/acsami.8b21936

10. Light-actuated reversible shape memory effect of a polymer composite Part A Applied science and manufacturing

Author:
Li, Wenbing; Liu, Yanju; Leng, Jinsong
Source:
Composites 2018 v.110 pp. 70-75
ISSN:
1359-835X
Subject:
acetates; ethylene-vinyl acetate,   etc   ; heat; irradiation;     Show all 4 Subjects
Abstract:
... In the current study, a novel polymer composite with excellent light-actuated two-way shape memory effect (2W-SME) was fabricated using poly (ethylene-co-vinyl acetate) (EVA) as matrix and p-aminodiphenylimide (p-AP) as both light-absorber and heat source (EVA/p-AP). Unlike traditional thermally-driven two-way reversible shape memory polymers, in our concept, the EVA/p-AP featured remotely control ...
DOI:
10.1016/j.compositesa.2018.04.019

11. Baylis-Hillman acetates in organic synthesis: A simple two-step strategy for oxindole-spiro-α-arylidene-γ-butyrolactone framework

Author:
Basavaiah, Deevi; Lingam, Harathi; Babu, Thelagathoti Hari
Source:
Tetrahedron 2018 v.74 no.19 pp. 2306-2313
ISSN:
0040-4020
Subject:
acetates,   etc   ; alkylation; moieties;     Show all 3 Subjects
Abstract:
... A facile, convenient, and two step strategy for synthesis of spirooxindoles containing α-arylidene-γ-butyrolactone moiety has been developed via monoalkylation of 2-oxindoles with Baylis-Hillman acetates followed by the spirolactonization of the resulting cinnamic esters on treatment with phenyliodine (III) bistrifluoroacetate (PIFA). ...
DOI:
10.1016/j.tet.2018.03.035

12. Adaptation of anaerobic culture to bioconversion of carbon dioxide with hydrogen to biomethane

Author:
Pokorna, Dana; Varga, Zdenek; Andreides, Dominik; Zabranska, Jana
Source:
Renewable energy 2019 v.142 pp. 167-172
ISSN:
0960-1481
Subject:
acetates,   etc   ; acetogens; biogas; biomass; biotransformation; carbon dioxide; hydrogen; methane; methanogens;     Show all 9 Subjects
Abstract:
... Biogas is composed of energetically useable methane (CH4) ranging from 50 to 70% and carbon dioxide (CO2) taking up 30–50%. To upgrading biogas to biomethane for better exploitation of its energetical potential, many different physico-chemical processes are commercially applied. Besides these methods, biological methods for the conversion of CO2 with electrolytic H2 to biomethane based on the acti ...
DOI:
10.1016/j.renene.2019.04.076

13. Effects of zeolite and vermiculite addition on exchangeable radiocaesium in soil with accelerated ageing

Author:
Yamaguchi, Noriko; Hikono, Atsuko; Saito, Takashi
Source:
Journal of environmental radioactivity 2019 v.203 pp. 18-24
ISSN:
0265-931X
Subject:
ammonium acetate,   etc   ; cesium; radioactivity; radionuclides; soil; soil amendments; vermiculite; zeolites;     Show all 8 Subjects
Abstract:
... Soil amendments with zeolite and vermiculite were expected to prevent radiocaesium (137Cs) dissolution and uptake from the soil by plants. In this study, we investigated how zeolite and vermiculite added to soil influence the radiocaesium fixation with ageing. Zeolite and vermiculite were mixed with soil (1 wt%) before or after the addition of carrier-free caesium-137 (137Cs) to soils with differe ...
DOI:
10.1016/j.jenvrad.2019.02.011

14. Matrix effects influencing the perception of 3-mercaptohexan-1-ol (3MH) and 3-mercaptohexyl acetate (3MHA) in different Chenin Blanc wines by Projective Mapping (PM) with Ultra Flash profiling (UFP) intensity ratings

Author:
Wilson, Christine; Brand, Jeanne; du Toit, Wessel; Buica, Astrid
Source:
Food research international 2019 v.121 pp. 633-640
ISSN:
0963-9969
Subject:
acetates,   etc   ; models; odors; rapid methods; sensory evaluation; thiols; wines;     Show all 7 Subjects
Abstract:
... Interaction studies are used in sensory evaluation to elucidate the complex influences (additive, masking, synergistic) that various compounds have on the perception of wine aroma. To these, the interactions between the matrix and the compounds of interest add another layer of complexity. Unlike previous interaction studies, the current work used a rapid method, Projective Mapping (PM) coupled wit ...
DOI:
10.1016/j.foodres.2018.12.032

15. Bioreduction of selenate in an anaerobic biotrickling filter using methanol as electron donor

Author:
Eregowda, Tejaswini; Rene, Eldon R.; Lens, Piet N.L.
Source:
Chemosphere 2019 v.225 pp. 406-413
ISSN:
0045-6535
Subject:
acetates,   etc   ; biofilters; gases; liquids; methanol; selenates; volatile fatty acids;     Show all 7 Subjects
Abstract:
... The anaerobic bioreduction of selenate, fed in step (up to 60 mg.L−1) or continuous (∼7 mg.L−1) trickling mode, in the presence of gas-phase methanol (4.3–50 g m−3.h−1) was evaluated in a biotrickling filter (BTF). During the 48 d of step-feed and 41 d of continuous-feed operations, average selenate removal efficiencies (RE) > 90% and ∼68% was achieved, corresponding to a selenate reduction rate o ...
DOI:
10.1016/j.chemosphere.2019.02.158

16. Biotransformation of organic acids to their corresponding alcohols by Thermoanaerobacter pseudoethanolicus

Author:
Scully, Sean M.; Brown, Aaron; Ross, Andrew B.; Orlygsson, Johann
Source:
Anaerobe 2019 v.57 pp. 28-31
ISSN:
1075-9964
Subject:
acetates,   etc   ; Thermoanaerobacter; biotransformation; butanol; carbon; feedstocks; glucose; metabolism; stable isotopes;     Show all 9 Subjects
Abstract:
... Higher order alcohols, such as 1-butanol and 1-hexanol, have a large number of applications but are currently prepared from non-renewable feedstocks. Here, the ability of Thermoanaerobacter pseudoethanolicus to reduce short-chain fatty acids to their corresponding alcohols using reducing potential generated by glucose catabolism with yields between 21.0 and 61.0%. 13C-labelled acetate, 1-propionat ...
DOI:
10.1016/j.anaerobe.2019.03.004

17. Impact of different running conditions on performance of biofilters treating secondary effluent during start-up

Author:
Zhang, Shiyang; Zhu, Changbo; Xia, Shibin; Li, Meng
Source:
Bioresource technology 2019 v.281 pp. 168-178
ISSN:
0960-8524
Subject:
sodium acetate,   etc   ; aeration; biofilters; carbon; denitrification; glucose; nitrification; China;     Show all 8 Subjects
Abstract:
... In this study, the impact of different aeration sequences, hydraulic retention time (HRT), aeration time ratios and external carbon types on performance of biofilters treating secondary effluent during start-up was explored. For an intermittently aerated nitrifying filter, the adjustment of aeration sequence with prior nitrification or denitrification had no significant impact on overall performan ...
DOI:
10.1016/j.biortech.2019.02.094

18. Bioaugmentation with the sulfur oxidizing Thauera sp. HDD1 for shortening the startup time in the denitrifying sulfide removal process

Author:
Zhao, Youkang; Huang, Cong; Ma, Xiaodan; Chen, Fan; Liang, Bin; Wang, Aijie
Source:
Bioresource technology reports 2019 pp. 100192
ISSN:
2589-014X
Subject:
acetates,   etc   ; Arcobacter; Azoarcus; Thauera; bioaugmentation; denitrification; nitrates; sulfur; wastewater;     Show all 9 Subjects
Abstract:
... The denitrifying sulfide removal (DSR) process supplied an effective method to recovery S0 and the removal of nitrate from wastewater. However, long startup time limited the application. This study presents an effective strategy of bioaugmentation with the sulfur oxidizing Thauera sp. HDD1 to reducing the startup time in the DSR process. In the bioaugmentation reactors, the removal efficiency of a ...
DOI:
10.1016/j.biteb.2019.100192

19. Meerkats (Suricata suricatta) are able to detect hidden food using olfactory cues alone

Author:
Sörensen, Ida; Amundin, Mats; Laska, Matthias
Source:
Physiology & behavior 2019 v.202 pp. 69-76
ISSN:
0031-9384
Subject:
acetates,   etc   ; Suricata suricatta; bananas; chickens; foraging; mice; odors; smell;     Show all 8 Subjects
Abstract:
... Meerkats (Suricata suricatta) are known to strongly rely on chemical signals for social communication. However, little is known about their use of the sense of smell in foraging and food detection. The aim of the present study was therefore to assess whether captive meerkats are able to (1) detect hidden food using olfactory cues alone, (2) discriminate between the odor of real food and a single f ...
DOI:
10.1016/j.physbeh.2019.02.002

20. DFT study of the influence of acetyl groups of cellulose acetate on its intrinsic birefringence and wavelength dependence

Author:
Hayakawa, Daichi; Gouda, Hiroaki; Hirono, Shuichi; Ueda, Kazuyoshi
Source:
Carbohydrate polymers 2019 v.207 pp. 122-130
ISSN:
0144-8617
Subject:
cellulose acetate,   etc   ; density functional theory; models; moieties; wavelengths;     Show all 5 Subjects
Abstract:
... The effect of the acetyl groups of cellulose acetate (CA) on its intrinsic birefringence and its wavelength dependence was investigated using density functional theory (DFT). Seven types of CA repeating-unit models that differ in their degree of substitution (DS) and substitution sites were used in the calculations. The results suggested that the intrinsic birefringence (Δn°) and its wavelength de ...
DOI:
10.1016/j.carbpol.2018.11.074