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Journal articles on the topic 'Dehydroxylace'

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Published: 4 June 2021
Last updated: 1 February 2022

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1

Drits, Victor A., Boris A. Sakharov, Olga V. Dorzhieva, Bella B. Zviagina, and Holger Lindgreen. "Determination of the phase composition of partially dehydroxylated kaolinites by modelling their X-ray diffraction patterns." Clay Minerals 54, no. 3 (August 1, 2019): 309–22. http://dx.doi.org/10.1180/clm.2019.39.

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AbstractModelling of experimental X-ray diffraction (XRD) patterns is used to determine the phase composition of partially dehydroxylated kaolinite samples. To identify unambiguously the presence of two or three phases in the heated kaolinite samples, the full range of their XRD patterns has to be analysed. Two different kaolinites, from Imerys (UK) and from Georgia (USA; KGa-21), were studied. The heating temperatures were selected to cover the entire range of dehydroxylation for both kaolinites (400–550°C for Imerys and 400–495°C for KGa-21). Two different dehydroxylation pathways were observed. At each stage of partial dehydroxylation, the kaolinite from Imerys consisted of the original, non-dehydroxylated kaolinite and of a fully dehydroxylated phase, metakaolinite. During partial dehydroxylation of kaolinite KGa-21, each product formed at a given heating temperature consisted of three phases: the original kaolinite; a dehydroxylated phase, metakaolinite; and a phase with diffraction features corresponding to a defective kaolinite-like structure. To determine the content of metakaolinite in a partially dehydroxylated specimen, its experimental XRD pattern was reproduced by the optimal summation of the diffraction patterns of the initial kaolinite and metakaolinite. A procedure that reveals the basic diffraction features of the third phase is suggested. The XRD patterns and thus the structures of the metakaolinites formed after dehydroxylation of the Imerys and KGa-21 samples differ substantially. The conventional determination of the initial kaolinite and metakaolinite contents in partially dehydroxylated kaolinite based on the analysis of basal reflections and weight losses may lead to overlooking the formation of the intermediate phases.
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2

Thomas, L. A., A. King, G. L. French, G. M. Murphy, and R. H. Dowling. "Cholylglycine hydrolase and 7α-dehydroxylase." Clinica Chimica Acta 268, no. 1-2 (December 1997): 61–72. http://dx.doi.org/10.1016/s0009-8981(97)00169-1.

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3

Dainyak, Lidia G., Bella B. Zviagina, Viacheslav S. Rusakov, and Victor A. Drits. "Interpretation of the nontronite-dehydroxylate Mossbauer spectrum using EFG calculations." European Journal of Mineralogy 18, no. 6 (December 20, 2006): 753–64. http://dx.doi.org/10.1127/0935-1221/2006/0018-0753.

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4

Halbert, Stéphanie, Simona Ispas, Christophe Raynaud, and Odile Eisenstein. "Modelling the surface of amorphous dehydroxylated silica: the influence of the potential on the nature and density of defects." New Journal of Chemistry 42, no. 2 (2018): 1356–67. http://dx.doi.org/10.1039/c7nj03922k.

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5

Drits, V. A., and A. Derkowski. "Kinetic behavior of partially dehydroxylated kaolinite." American Mineralogist 100, no. 4 (April 1, 2015): 883–96. http://dx.doi.org/10.2138/am-2015-5083.

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6

Conley, Matthew P., Aaron J. Rossini, Aleix Comas-Vives, Maxence Valla, Gilles Casano, Olivier Ouari, Paul Tordo, Anne Lesage, Lyndon Emsley, and Christophe Copéret. "Silica-surface reorganization during organotin grafting evidenced by 119Sn DNP SENS: a tandem reaction of gem-silanols and strained siloxane bridges." Phys. Chem. Chem. Phys. 16, no. 33 (2014): 17822–27. http://dx.doi.org/10.1039/c4cp01973c.

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7

Salnikov, Oleg G., Hsueh-Ju Liu, Alexey Fedorov, Dudari B. Burueva, Kirill V. Kovtunov, Christophe Copéret, and Igor V. Koptyug. "Pairwise hydrogen addition in the selective semihydrogenation of alkynes on silica-supported Cu catalysts." Chemical Science 8, no. 3 (2017): 2426–30. http://dx.doi.org/10.1039/c6sc05276b.

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8

Del Rosal, Iker, Iann C. Gerber, Romuald Poteau, and Laurent Maron. "Grafting of lanthanide complexes on silica surfaces dehydroxylated at 200 °C: a theoretical investigation." New Journal of Chemistry 39, no. 10 (2015): 7703–15. http://dx.doi.org/10.1039/c5nj01645b.

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9

Högerl, Manuel P., Li Min Serena Goh, Edy Abou-Hamad, Samir Barman, Oliver Dachwald, Farhan Ahmad Pasha, Jeremie Pelletier, et al. "SOMC grafting of vanadium oxytriisopropoxide (VO(OiPr)3) on dehydroxylated silica; analysis of surface complexes and thermal restructuring mechanism." RSC Advances 8, no. 37 (2018): 20801–8. http://dx.doi.org/10.1039/c8ra02419g.

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10

Adjei, Stephen, Salaheldin Elkatatny, Pranjal Sarmah, and Gonzalo Chinea. "Investigation of Dehydroxylated Sodium Bentonite as a Pozzolanic Extender in Oil-Well Cement." SPE Drilling & Completion 36, no. 03 (April 29, 2021): 730–37. http://dx.doi.org/10.2118/205487-pa.

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Summary Fly ash, which is a pozzolan generated as a byproduct from coal-powered plants, is the most used extender in the design of lightweight cement. However, the coal-powered plants are phasing out due to global-warming concerns. There is the need to investigate other materials as substitutes to fly ash. Bentonite is a natural pozzolanic material that is abundant in nature. This pozzolanic property is enhanced upon heat treatment; however, this material has never been explored in oil-well cementing in such form. This study compares the performance of 13-ppg heated (dehydroxylated) sodium bentonite and fly-ash cement systems. The raw (commercial) sodium bentonite was dehydroxylated at 1,526°F for 3 hours. Cement slurries were prepared at 13 ppg using the heated sodium bentonite as partial replacements of cement in concentrations of 10 to 50% by weight of blend. Various tests were done at a bottomhole static temperature of 120°F, bottomhole circulating temperature of 110°F, and pressure of 1,000 psi or atmospheric pressure. All the dehydroxylated sodium bentonite systems exhibited high stability, thickening times in the range of 3 to 5 hours, and a minimum 24-hour compressive strength of 600 psi. At a concentration of 40 and 50%, the 24-hour compressive strength was approximately 800 and 787 psi, respectively. This was higher than a 13-ppg fly-ash-based cement designed at 40% cement replacement (580 psi).
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11

Muller, F., C. H. Pons, and A. Papin. "Study of dehydroxylated-rehydroxylated smectites by SAXS." Journal de Physique IV (Proceedings) 12, no. 6 (July 2002): 17–24. http://dx.doi.org/10.1051/jp4:20020208.

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12

Zholobenko, Vladimir. "N2O Decomposition over Dehydroxylated HZSM-5 Zeolites." Mendeleev Communications 3, no. 2 (January 1993): 67–68. http://dx.doi.org/10.1070/mc1993v003n02abeh000228.

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13

Cui, Yong, Tao Lu, Zhihao Shi, and Jie Feng. "Dehydroxylated amination accompanied by 1,2-sulfur immigration." Organic Chemistry Frontiers 6, no. 5 (2019): 643–47. http://dx.doi.org/10.1039/c8qo01211c.

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14

Liu, Shuai, Ke Chen, Xin-Chan Lan, Wen-Juan Hao, Guigen Li, Shu-Jiang Tu, and Bo Jiang. "Synergistic silver/scandium catalysis for divergent synthesis of skeletally diverse chromene derivatives." Chemical Communications 53, no. 77 (2017): 10692–95. http://dx.doi.org/10.1039/c7cc05563c.

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The combination of AgTFA and Sc(OTf)3 enables the bimetallic synergistic catalysis of β-alkynyl ketones and o-hydroxybenzyl alcohols, allowing divergent synthesis of three classes of skeletally diverse chromene derivatives with generally high diastereoselectivity through dehydroxylated bi- and tri-cyclization cascades.
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15

Ruan, H. D., and R. J. Gilkes. "Kinetics of phosphate sorption and desorption by synthetic aluminous goethite before and after thermal transformation to hematite." Clay Minerals 31, no. 1 (March 1996): 63–74. http://dx.doi.org/10.1180/claymin.1996.031.1.06.

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AbstractGoethite is an important component of many soils and its transformation to hematite by fire may affect phosphate retention. This study deals with the kinetics of phosphate sorption and desorption by synthetic aluminous goethites and their dehydroxylated products. Phosphate sorption and subsequent desorption were measured for periods up to 128 h. Phosphate sorption increased with equilibrium solution concentration, Al substitution and surface area, and decreased with increasing crystal size. The trend in amount of phosphate sorbed was: partially dehydroxylated goethite > hematite > goethite. Sorption and desorption kinetics are well described by the modified Elovich equation. Desorption of a minor proportion of the sorbed P was rapid and this was sometimes followed by minor resorption. The amount of P desorbed directly reflected the amount that was initially sorbed. Acid dissolution of the Fe oxides with sorbed phosphate suggested that most phosphate was present at the crystal surface and not in relatively poorly accessible micropores.
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16

Sharma, Renu, M. J. McKelvy, Hamdallah Bearat, Andrew V. G. Chizmeshya, and R. W. Carpenter. "In Situ Observation of Nanocrystal Formation Via Dehydroxylation." Microscopy and Microanalysis 7, S2 (August 2001): 438–39. http://dx.doi.org/10.1017/s1431927600028269.

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Recently, a promising new route to prepare nano phase composites with fine transition metal particles (2 - 50nm) has been proposed via dehydroxylation and dehydration process. Thermal and mechanical dehydroxylation process has also been used to form ultra fine powders of NiO-Ni(OH). We have found a substantially increased carbonation rate at room temperature (RT) for partially dehydroxylated brucite (Mg(OH)2) single crystal fragments. BET measurements confirm the increase in the surface area of partially dehydroxylated (90%) single-crystal Mg(OH)2 fragments, which directly contributes to the increase in carbonation reactivity. As dehydroxylation proceeds rapidly in a TEM column, due to high vacuum and electron beam effects, the atomic level nature of the process has not been understood until recently.6 We have observed the development of nanocrystals during in situdehydroxylation of Mg(OH)2.Experiments were performed using a PHILIPS-430 electron microscope operated at 300KV, fitted with a differentially pumped environmental-cell (E-cell) and a Gatan Imaging Filter (GIF).
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17

Létouraeau, L., J. G. Bisaillon, F. Lépine, and R. Beaudet. "Spore-forming bacteria that carboxylate phenol to benzoic acid under anaerobic conditions." Canadian Journal of Microbiology 41, no. 3 (March 1, 1995): 266–72. http://dx.doi.org/10.1139/m95-036.

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A methanogenic consortium transforming phenol to benzoic acid was submitted to different treatments to characterize the carboxylating microorganisms and eventually to facilitate their isolation. Under aerobic conditions, phenol was not transformed by the consortium and no growth was observed on solid medium. The consortium from an inoculum that was treated with heat, or heat and ethanol, retained the ability to carboxylate phenol under strictly anaerobic conditions. Electron microscopic observations of the consortium from an inoculum that was heated for 15 min at 80 °C revealed only Gram-positive bacilli. In this culture, methane production was not detected and benzoic acid accumulated. Five colonies with distinct morphologies were isolated from this culture on solid medium. Four of these strains were identified as Clostridium spp. In contrast to the untreated culture, none of the strains isolated were able to carboxylate phenol in pure culture or in coculture, nor could they decarboxylate or dehydroxylate 4-hydroxybenzoic acid, or oxidize 2-hydroxybenzyl alcohol, or O-demethylate anisole or 2-methoxyphenol. Also, the consortium from a treated inoculum retained its ability to decarboxylate and dehydroxylate 4-hydroxybenzoic acid forming phenol and benzoic acid, respectively, but could not accomplish the other reactions. These results suggest that spore-forming microorganisms are involved in the carboxylation of phenol and in the decarboxylation and dehydroxylation of 4-hydroxybenzoic acid.Key words: spore-forming bacteria, phenol, benzoic acid, methanogenic conditions, carboxylation.
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18

Drits, V. A., A. Derkowski, and D. K. McCarty. "Kinetics of thermal transformation of partially dehydroxylated pyrophyllite." American Mineralogist 96, no. 7 (June 24, 2011): 1054–69. http://dx.doi.org/10.2138/am.2011.3730.

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19

Lee, Jae Sung, and Michel Boudart. "Decomposition of Molybdenum Hexacarbonyl Deposited on Dehydroxylated Alumina." Japanese Journal of Applied Physics 32, S2 (January 1, 1993): 472. http://dx.doi.org/10.7567/jjaps.32s2.472.

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20

Khokhlova, T. D., A. A. Mandrugin, T. P. Trofimova, and V. M. Fedoseev. "Adsorption of NO synthase inhibitor on dehydroxylated silica." Protection of Metals and Physical Chemistry of Surfaces 46, no. 4 (July 2010): 427–29. http://dx.doi.org/10.1134/s2070205110040064.

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21

Zholobenko, Vladimir. "Preparation of Phenol over Dehydroxylated HZSM-5 Zeolites." Mendeleev Communications 3, no. 1 (January 1993): 28–29. http://dx.doi.org/10.1070/mc1993v003n01abeh000208.

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22

Emmerich, Katja. "Spontaneous Rehydroxylation of a Dehydroxylated Cis-Vacant Montmorillonite." Clays and Clay Minerals 48, no. 3 (2000): 405–8. http://dx.doi.org/10.1346/ccmn.2000.0480312.

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23

Ptáček, Petr, Tomáš Opravil, František Šoukal, Jaromír Havlica, Jiří Másilko, and Jaromír Wasserbauer. "Preparation of dehydroxylated and delaminated talc: Meta-talc." Ceramics International 39, no. 8 (December 2013): 9055–61. http://dx.doi.org/10.1016/j.ceramint.2013.04.109.

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24

Searles, Keith, Georges Siddiqi, Olga V. Safonova, and Christophe Copéret. "Silica-supported isolated gallium sites as highly active, selective and stable propane dehydrogenation catalysts." Chemical Science 8, no. 4 (2017): 2661–66. http://dx.doi.org/10.1039/c6sc05178b.

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Single-site gallium centers, obtained via grafting of a molecular siloxide precursor on the surface of partially dehydroxylated silica followed and a thermal transformation, display high initial activity for propane dehydrogenation, (TOF 20 mol C3H6 per mol Ga per h), and high selectivity for propylene (≥93) over 20 h.
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25

Dubois, Lawrence H., and Bernard R. Zegarski. "Reaction of alkoxysilane coupling agents with dehydroxylated silica surfaces." Journal of the American Chemical Society 115, no. 3 (February 1993): 1190–91. http://dx.doi.org/10.1021/ja00056a078.

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26

ZHOLOBENKO, V. "ChemInform Abstract: N2O Decomposition Over Dehydroxylated HZSM-5 Zeolites." ChemInform 25, no. 33 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199433030.

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27

Slavov, Stefan V., Karl T. Chuang, and Alan R. Sanger. "Methane Elimination During Silation of Partially Dehydroxylated .gamma.-Alumina." Langmuir 11, no. 10 (October 1995): 3607–9. http://dx.doi.org/10.1021/la00010a001.

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28

Pandey, Priyanka, Smita Mohanty, and Sanjay Kumar Nayak. "Influence of thermally induced, dehydroxylated nanoclay on polymer nanocomposites." Korean Journal of Chemical Engineering 31, no. 8 (May 31, 2014): 1480–89. http://dx.doi.org/10.1007/s11814-014-0094-3.

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29

Mougel, V., and C. Copéret. "Magnitude and consequences of OR ligand σ-donation on alkene metathesis activity in d0 silica supported (SiO)W(NAr)(CHtBu)(OR) catalysts." Chem. Sci. 5, no. 6 (2014): 2475–81. http://dx.doi.org/10.1039/c4sc00230j.

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Well-defined silica supported W catalysts with the general formula [(SiO)W(NAr)(CHtBu)(OR)] (OR = OtBuF9, OtBuF6, OtBuF3, OtBu and OSi(OtBu)3), prepared by grafting bis-alkoxide complexes [W(NAr)(CHtBu)(OR)2] on silica dehydroxylated at 700 °C (SiO2(700)), display unexpectedly high activity in comparison with their Mo homologues.
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30

Madej, Dominika, and Karina Tyrała. "In Situ Spinel Formation in a Smart Nano-Structured Matrix for No-Cement Refractory Castables." Materials 13, no. 6 (March 19, 2020): 1403. http://dx.doi.org/10.3390/ma13061403.

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The hydration of an equimolar mixture of MgO and Al2O3 nano-powders has been proven to be an effective way to synthesize Mg6Al2CO3(OH)16∙4H2O as a component of a nano-structured matrix and magnesia-alumina spinel precursor for high-performance cement-free corundum-spinel refractory castables. (Mg3)–OH–brucite sites (417 °C) formed initially within the magnesia–alumina hydrating blended paste were replaced with (Mg2Al)–OH and (Mg3)–OH hydrotalcite sites, which were dehydroxylated at 420 °C and 322 °C, respectively. This reorganization was connected with the incorporation of anions and water molecules in the interlayer spacing of hydrotalcite, which was dehydrated at 234 °C. Hence, the thermal decomposition of a nano-structured matrix system containing mainly Mg6Al2CO3(OH)16∙4H2O consists of a complex sequence of dehydration, dehydroxylation and decarbonization, and this finally leads to the formation of inverse spinel MgAl2O4 and periclase MgO through many intermediate stages containing the mixed tetrahedral-octahedral Al phase and MgO-like structure. Hence, the hydraulic bond that primarily existed was replaced by a ceramic bond at a relatively low temperature, i.e., 700 °C, where a spinel was formed. Important changes in oxygen coordination polyhedra around Al3+ in the dehydrated-dehydroxylated hydrotalcite occurred between 600 and 1100 °C.
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31

Khokhlova, T. D., Yu S. Nikitin, and A. L. Detistova. "Modification of Silicas and Their Investigation by Dye Adsorption." Adsorption Science & Technology 15, no. 5 (May 1997): 333–40. http://dx.doi.org/10.1177/026361749701500501.

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Various silicas (silica gel, silochrome, alumosilica, Aerosil and quartz) were modified by dehydroxylation, calcium hydroxide, aluminium chloride and organosilanes with hydrophobic and aminopropyl groups. The surface characteristics of the modified materials were evaluated by means of basic and acid dye adsorption from aqueous solution. The degree of modification, the hydrolytic stability of the organosilyl silicas and the rehydroxylation rate of the dehydroxylated silicas were determined via the kinetics of dye adsorption and their respective isotherms.
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32

Rietmeijer, Frans J. M., and Joseph A. Nuth. "A Metastable Aluminosilica Compound for Aluminum and Water Transport to the Upper Mantle." International Journal of Geophysics 2009 (2009): 1–4. http://dx.doi.org/10.1155/2009/909431.

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It has been suggested that crystalline “phase egg,”AlSiO3OH, with a ratioAl/Si=1could carry aluminum and water to the mantle but its natural occurrences are still speculative. An amorphous phase with a fixed and unique, deep metastable eutecticAl2Si2O7composition was produced in laboratory experiments wherein conditions favored kinetically controlled formation of amorphous solids. This experimentally produced kaolinite-dehydroxylate is highly reactive and it is proposed as the precursor of phase egg in subducting slabs of crustal rocks. If so, metastable phases play a role in subduction zones and it then follows that the processes and resulting conditions in these environments can be nonuniform and discontinuous at least at micrometer scales.
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33

Glass, Thomas L., and Robbin S. Lamppa. "Purification and properties of 16α-hydroxyprogesterone dehydroxylase from Eubacterium sp. strain 144." Biochimica et Biophysica Acta (BBA) - Lipids and Lipid Metabolism 837, no. 2 (November 1985): 103–10. http://dx.doi.org/10.1016/0005-2760(85)90232-2.

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34

Domansky, Karel, Jun Liu, Li-Qiong Wang, Mark H. Engelhard, and Suresh Baskaran. "Chemical sensors based on dielectric response of functionalized mesoporous silica films." Journal of Materials Research 16, no. 10 (October 2001): 2810–16. http://dx.doi.org/10.1557/jmr.2001.0387.

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Dielectric response of mesoporous silica films was monitored as a function of several gas-phase chemical species. The effects of humidity, ammonia, and methane on dielectric constant and dissipation factor of films subjected to different chemical treatments are described. Dielectric constant and dissipation factor of partially dehydroxylated films were found to be highly sensitive to both water vapor and ammonia in air. The capacitive devices based on mesoporous silica films show potential for use in chemical sensors.
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35

Babic, Tanja, Jason Ambler, Kirsteen N. Browning, and R. Alberto Travagli. "Characterization of synapses in the rat subnucleus centralis of the nucleus tractus solitarius." Journal of Neurophysiology 113, no. 2 (January 15, 2015): 466–74. http://dx.doi.org/10.1152/jn.00598.2014.

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The nucleus tractus solitarius (NTS) receives subdiaphragmatic visceral sensory information via vagal A- or C-fibers. We have recently shown that, in contrast to cardiovascular NTS medialis neurons, which respond to either purinergic or vanilloid agonists, the majority of esophageal NTS centralis (cNTS) neurons respond to vanilloid agonists, whereas a smaller subset responds to both vanilloid and purinerigic agonists. The present study aimed to further investigate the neurochemical and synaptic characteristics of cNTS neurons using whole cell patch-clamp, single cell RT-PCR and immunohistochemistry. Excitatory postsynaptic currents (EPSCs) were evoked in cNTS by tractus solitarius stimulation, and in 19 of 64 neurons perfusion with the purinergic agonist αβ-methylene ATP (αβMeATP) increased the evoked EPSC amplitude significantly. Furthermore, neurons with αβMeATP-responsive synaptic inputs had different probabilities of release compared with nonresponsive neurons. Single cell RT-PCR revealed that 8 of 13 αβMeATP-responsive neurons expressed metabotropic glutamate receptor 8 (mGluR8) mRNA, which our previous studies have suggested is a marker of glutamatergic neurons, whereas only 3 of 13 expressed glutamic acid dehydroxylase, a marker of GABAergic neurons. A significantly lower proportion of αβMeATP-nonresponsive neurons expressed mGluR8 (2 of 30 neurons), whereas a greater proportion expressed glutamic acid dehydroxylase (12 of 30 neurons). Esophageal distension significantly increased the number of colocalized mGluR8- and c-Fos-immunoreactive neurons in the cNTS from 8.0 ± 4% to 20 ± 2.5%. These data indicate that cNTS comprises distinct neuronal subpopulations that can be distinguished based on their responses to purinergic agonists and that these subpopulations have distinct neurochemical and synaptic characteristics, suggesting that integration of sensory inputs from the esophagus relies on a discrete organization of synapses between vagal afferent fibers and cNTS neurons.
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36

Cortés, Joaquín, Gloria Troncoso, and Eliana Valencia. "Calculation of the adsorption potential of argon on dehydroxylated Aerosil." Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases 81, no. 7 (1985): 1637. http://dx.doi.org/10.1039/f19858101637.

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37

Drits, V. A., A. Derkowski, and D. K. McCarty. "New insight into the structural transformation of partially dehydroxylated pyrophyllite." American Mineralogist 96, no. 1 (December 22, 2010): 153–71. http://dx.doi.org/10.2138/am.2011.3605.

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38

Šot, Petr, Christophe Copéret, and Jeroen A. van Bokhoven. "Fully Dehydroxylated Silica Generated from Hydrosilane: Surface Defects and Reactivity." Journal of Physical Chemistry C 123, no. 38 (September 5, 2019): 23480–87. http://dx.doi.org/10.1021/acs.jpcc.9b05196.

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39

ZHOLOBENKO, V. "ChemInform Abstract: Preparation of Phenol Over Dehydroxylated HZSM-5 Zeolites." ChemInform 25, no. 33 (August 19, 2010): no. http://dx.doi.org/10.1002/chin.199433296.

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40

Goworek, Jacek, and Aniela Nieradka. "Adsorption from Ternary Liquid Mixtures on Partially Dehydroxylated Silica Gel." Journal of Colloid and Interface Science 180, no. 2 (June 1996): 371–76. http://dx.doi.org/10.1006/jcis.1996.0315.

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41

Tosoni, Sergio, Bartolomeo Civalleri, and Piero Ugliengo. "Hydrophobic Behavior of Dehydroxylated Silica Surfaces: A B3LYP Periodic Study." Journal of Physical Chemistry C 114, no. 47 (November 9, 2010): 19984–92. http://dx.doi.org/10.1021/jp103918g.

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42

Ceresoli, D., M. Bernasconi, S. Iarlori, M. Parrinello, and E. Tosatti. "Two-Membered Silicon Rings on the Dehydroxylated Surface of Silica." Physical Review Letters 84, no. 17 (April 24, 2000): 3887–90. http://dx.doi.org/10.1103/physrevlett.84.3887.

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43

Eltekov, Yu A., and V. Khopina. "Adsorption of aromatic hydrocarbons on hydroxylated and dehydroxylated silica gel." Langmuir 3, no. 6 (November 1987): 957–59. http://dx.doi.org/10.1021/la00078a013.

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44

Borade, Ramesh, Alain Adnot, and Serge Kaliaguine. "An XPS study of acid sites in dehydroxylated Y zeolites." Journal of Molecular Catalysis 61, no. 1 (July 1990): L7—L14. http://dx.doi.org/10.1016/0304-5102(90)85187-m.

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45

Podoba, Rudolf, Igor Štubňa, Jozefa Lukovičová, and Peter Bačík. "The Firing Temperature of Romanesque Brick from Pác." Selected Scientific Papers - Journal of Civil Engineering 7, no. 2 (November 1, 2012): 79–86. http://dx.doi.org/10.2478/v10299-012-0009-y.

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Abstract A pavement brick taken from a Romanesque part of the church in Pác, in the Trnava County, Slovakia, was investigated by x-ray diffraction analysis (XRD) and thermal analyses as differential thermal analysis (DTA), thermogravimetry (TG) and thermodilatometry (TD). It was found that the brick contained dehydroxylated illitic clay, calcite and quartz. As revealed, dehydroxylation was completely finished and no redehydroxylation was observed. Partial decomposition of calcite was also found. The estimated firing temperature is between 600 °C and 700 °C.
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46

Coleman, J. P., W. B. White, and P. B. Hylemon. "Molecular cloning of bile acid 7-dehydroxylase from Eubacterium sp. strain VPI 12708." Journal of Bacteriology 169, no. 4 (1987): 1516–21. http://dx.doi.org/10.1128/jb.169.4.1516-1521.1987.

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47

Astutiningsih, Sotya, Dwi Marta Nurjaya, Henki Wibowo Ashadi, and Niken Swastika. "Durability of Geopolymer Concretes upon Seawater Exposure." Advances in Science and Technology 69 (October 2010): 92–96. http://dx.doi.org/10.4028/www.scientific.net/ast.69.92.

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Geopolymer concrete with designed strength of 40 Mpa has been mixed from coarse aggregates, sands and geopolymer pastes. Two kinds of pastes are synthesized from different precursors, i.e. fly ash and dehydroxylated kaolin, using sodium silicate solution as the activator. Compression test pieces of 15x15x15 cm3 of both geopolymer and ordinary Portland cement (OPC) concretes (ASTM C39) have been cast and cured. Curing was done at room temperature for 1 day while Portland cement concretes were immersed in water for 28 days to provide complete hydration. After curing, the samples were immersed in ASTM seawater (ASTM D1141-90) for 7, 28, 56 and 90 days. It is found that geopolymer concretes were in general more durable upon seawater immersion than OPC concrete, This is indicated by the compressive strength retained after immersion. Dehydroxylated kaolin geopolymers show the best performance whose strength did not decrease with time of immersion. The strength of fly ash geopolymers decreased by about 20% during 56-day immersion but did not decrease further. Calcium content is suspected to cause the decrease in strength upon immersion. Kaolin geopolymers containing no calcium showed the best performance, while OPC which consist mostly of calcium silicate hydrates as the strength contributor, showed consistent decrease in strength. It is also found from the experiment that room temperature curing of fly ash geopolymer was slow but continued to progress until 28 days both under dry condition (not immersed) and immersed in water.
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48

Redfern, S. A. T. "The kinetics of dehydroxylation of kaolinite." Clay Minerals 22, no. 4 (December 1987): 447–56. http://dx.doi.org/10.1180/claymin.1987.022.4.08.

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AbstractThe dehydroxylation of kaolinite has been investigated by isothermal thermogravimetry. Kinetic analysis using the Avrami equation shows that a combination of atomic mechanisms operates throughout the temperature range 734 K to 890 K. An empirical activation energy of 222 kJ mol-1 was calculated from the Arrhenius relationship using rate constants based on diffusion and homogeneous models. The activation energy (Ea) was calculated for a series of degrees of dehydroxylation by the time to a given fraction method, showing an increase in Ea during the early stages of the reaction. The isothermal plots indicate that OH is retained in the final stages of the reaction. The observations are explained in terms of a reaction mechanism in which kaolinite grains dehydroxylate from the edges inwards, parallel to (001).
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49

Maini Rekdal, Vayu, Elizabeth N. Bess, Jordan E. Bisanz, Peter J. Turnbaugh, and Emily P. Balskus. "Discovery and inhibition of an interspecies gut bacterial pathway for Levodopa metabolism." Science 364, no. 6445 (June 13, 2019): eaau6323. http://dx.doi.org/10.1126/science.aau6323.

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The human gut microbiota metabolizes the Parkinson’s disease medication Levodopa (l-dopa), potentially reducing drug availability and causing side effects. However, the organisms, genes, and enzymes responsible for this activity in patients and their susceptibility to inhibition by host-targeted drugs are unknown. Here, we describe an interspecies pathway for gut bacteriall-dopa metabolism. Conversion ofl-dopa to dopamine by a pyridoxal phosphate-dependent tyrosine decarboxylase fromEnterococcus faecalisis followed by transformation of dopamine tom-tyramine by a molybdenum-dependent dehydroxylase fromEggerthella lenta. These enzymes predict drug metabolism in complex human gut microbiotas. Although a drug that targets host aromatic amino acid decarboxylase does not prevent gut microbiall-dopa decarboxylation, we identified a compound that inhibits this activity in Parkinson’s patient microbiotas and increasesl-dopa bioavailability in mice.
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50

Milliken, C. E., G. P. Meier, K. R. Sowers, and H. D. May. "Chlorophenol Production by Anaerobic Microorganisms: Transformation of a Biogenic Chlorinated Hydroquinone Metabolite." Applied and Environmental Microbiology 70, no. 4 (April 2004): 2494–96. http://dx.doi.org/10.1128/aem.70.4.2494-2496.2004.

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ABSTRACT Chlorinated hydroquinones of biological origin are fully dechlorinated to 1,4-dihydroquinone by anaerobic bacteria such as Desulfitobacterium spp. (C. E. Milliken, G. P. Meier, J. E. M. Watts, K. R. Sowers, and H. D. May, Appl. Environ. Microbiol. 70:385-392, 2004). In the present study, mixed microbial communities from Baltimore Harbor sediment and a pure culture of Desulfitobacterium sp. strain PCE1 were discovered to demethylate, reductively dehydroxylate, and dechlorinate chlorinated hydroquinones into chlorophenols. Mixed microbial cultures from a freshwater source and several other desulfitobacteria in pure culture did not perform these reactions. Desulfitobacterium sp. strain PCE1 degraded 2,3,5,6-tetrachloro-4-methoxyphenol, a metabolite of basidiomycete fungi, to 2,3,5,6-tetrachlorophenol and 2,3,5-trichlorophenol, recalcitrant compounds that are primarily synthesized anthropogenically.
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