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Journal articles on the topic 'Carbonate donors'

Author: Grafiati

Published: 5 June 2025

Last updated: 1 August 2025

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1

Samsonowicz-Górski, Jan, Anna Brodzka, Ryszard Ostaszewski, and Dominik Koszelewski. "Intensification of Double Kinetic Resolution of Chiral Amines and Alcohols via Chemoselective Formation of a Carbonate–Enzyme Intermediate." Molecules 27, no. 14 (2022): 4346. http://dx.doi.org/10.3390/molecules27144346.

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Chiral amines and alcohols are synthons of numerous pharmaceutically-relevant compounds. The previously developed enzymatic kinetic resolution approaches utilize a chiral racemic molecule and achiral acyl donor (or acyl acceptor). Thus, only one enantiodivergent step of the catalytic cycle is engaged, which does not fully exploit the enzyme’s abilities. The first carbonate-mediated example of simultaneous double chemoselective kinetic resolution of chiral amines and alcohols is described. Herein, we established a biocatalytic approach towards four optically-pure compounds (>99% ee, Enantios

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O’Loughlin, Edward J., Christopher A. Gorski, Theodore M. Flynn, and Michelle M. Scherer. "Electron Donor Utilization and Secondary Mineral Formation during the Bioreduction of Lepidocrocite by Shewanella putrefaciens CN32." Minerals 9, no. 7 (2019): 434. http://dx.doi.org/10.3390/min9070434.

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The bioreduction of Fe(III) oxides by dissimilatory iron reducing bacteria (DIRB) may result in the production of a suite of Fe(II)-bearing secondary minerals, including magnetite, siderite, vivianite, green rusts, and chukanovite; the formation of specific phases controlled by the interaction of various physiological and geochemical factors. In an effort to better understand the effects of individual electron donors on the formation of specific Fe(II)-bearing secondary minerals, we examined the effects of a series of potential electron donors on the bioreduction of lepidocrocite (γ-FeOOH) by

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Gravel, Christian, Danielle Lapierre, Judith Labelle, and Jeffrey W. Keillor. "Acyl transfer from carboxylate, carbonate, and thiocarbonate esters to enzymatic and nonenzymatic thiolates." Canadian Journal of Chemistry 85, no. 3 (2007): 164–74. http://dx.doi.org/10.1139/v07-011.

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Transglutaminases (EC 2.3.2.13) (TGases) catalyze calcium-dependent acyl transfer reactions between peptide-bound glutamine residues as acyl donors and peptide-bound lysine residues as acyl acceptors, resulting in the formation of intermolecular ε-(γ-glutamyl)lysine crosslinks. The mechanistic details of its "ping-pong" transamidation reaction remain unknown. In particular, few studies have been published probing the nucleophilicity of TGase using acyl-donor substrates of varied electrophilicity. Herein we report the synthesis of activated esters of carbonates, carbamates, and thiocarbonates a

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Medvedev, Alexander G., Alexey A. Mikhaylov, Andrei V. Churakov, Petr V. Prikhodchenko, and Ovadia Lev. "Ammonium and caesium carbonate peroxosolvates: supramolecular networks formed by hydrogen bonds." Acta Crystallographica Section C Crystal Structure Communications 68, no. 3 (2012): i20—i24. http://dx.doi.org/10.1107/s0108270112006701.

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Diammonium carbonate hydrogen peroxide monosolvate, 2NH4+·CO32−·H2O2, (I), and dicaesium carbonate hydrogen peroxide trisolvate, 2Cs+·CO32−·3H2O2, (II), were crystallized from 98% hydrogen peroxide. In (I), the carbonate anions and peroxide solvent molecules are arranged on twofold axes. The peroxide molecules act as donors in only two hydrogen bonds with carbonate groups, forming chains along theaandcaxes. In the structure of (II), there are three independent Cs+ions, two of them residing on twofold axes, as are two of the four peroxide molecules, one of which is disordered. Both structures c

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Harsha, Gouda, Mishra Bijoyananda, and Hotha Srinivas. "Minimal protection based glycosidation (MPG) reaction employing synergistic action of [Au]/[Ag]-catalytic system." Journal of Indian Chemical Society Vol. 97, Feb 2020 (2020): 265–70. https://doi.org/10.5281/zenodo.5651756.

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Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pune-411 008, Maharashtra, India <em>E-mail:</em> s.hotha@iiserpune.ac.in <em>Manuscript received online 25 December 2019, revised and accepted 06 January 2020</em> Minimal protection based glycosidations (MPG) where a minimally protected glycosyl donor is used for the synthesis of glycosides is highly rewarding over the conventional glycosidation reactions. The unique feature of this semi-classical protocol is that it not only eliminates multiple steps for the glycosyl donor synthesis but a

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Zhilina, Tatyana N., Daria G. Zavarzina, Ekaterina N. Detkova, Ekaterina O. Patutina, and Boris B. Kuznetsov. "Fuchsiella ferrireducens sp. nov., a novel haloalkaliphilic, lithoautotrophic homoacetogen capable of iron reduction, and emendation of the description of the genus Fuchsiella." International Journal of Systematic and Evolutionary Microbiology 65, Pt_8 (2015): 2432–40. http://dx.doi.org/10.1099/ijs.0.000278.

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Two strains of haloalkaliphilic homoacetogenic bacteria capable of iron reduction, Z-7101T and Z-7102, were isolated from soda lake Tanatar III (Altai, Russia). Cells of both strains were flexible, motile, Gram-negative, spore-forming rods. The strains were mesophilic and obligately alkaliphilic: the pH range for growth was 8.5–10.2 (pHopt 9.8). Growth depended on carbonate and chloride ions. The strains were able to grow chemolithoautotrophically on H2+CO2, producing acetate as the only metabolic product. In medium with carbonates as the only potential electron acceptor, the following substra

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7

Awang. "Enzymatic Synthesis of Palm Alkyl Ester Using Dialkyl Carbonate as an Alkyl Donors." American Journal of Applied Sciences 7, no. 8 (2010): 1083–86. http://dx.doi.org/10.3844/ajassp.2010.1083.1086.

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8

Hanessian, Stephen, Dongxu Qiu, Hubli Prabhanjan, Gurijala V. Reddy та Boliang Lou. "Synthesis of clustered D-GalNAc (Tn) and D-Galβ(1→3)GalNAc (T) antigenic motifs using a pentaerythritol scaffold". Canadian Journal of Chemistry 74, № 9 (1996): 1738–47. http://dx.doi.org/10.1139/v96-192.

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The tris(aminoethyl) and triamino derivatives of pentaerythritol have been used as scaffolds or templates for the attachment of immunologically relevant carbohydrates such as D-Galβ(1→3)GalNAc (T) and GalNAc (Tn), through amide linkages with the respective α-glycolyl and α-N-acetyl-L-serinyl glycosides. These clustered glycosidic motifs are intended as haptens for use in the preparation of tumor specific carbohydrate antigens and vaccines. Key words: glycoside synthesis, 2-thiopyridyl carbonate, glycosyl donors and glycopeptide motifs

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9

Barrientos-Galeana, Edgar, Mari Cruz Tolentino-Dolores, Rosa María Morales-Hernández, et al. "Bone Turnover Markers Changes Induced by Plateletpheresis May Be Minimized with Oral Supplementation of Calcium, Minerals, and Vitamin D before the Procedures: A Non-Randomized, Controlled Study." Journal of Clinical Medicine 12, no. 1 (2022): 281. http://dx.doi.org/10.3390/jcm12010281.

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Apheresis allows the collection of specific blood components but changes serum calcium (Ca), magnesium (Mg), copper (Cu), zinc (Zn), and hormones involved in bone metabolism due to citrate infusion. We assessed the effect of oral supplementation of calcium, vitamin D, and minerals as pills or an enriched diet before plateletpheresis donation on levels of divalent cations, hormones, and bone turnover markers that may prevent metabolic changes. Methods: Non-randomized controlled study including 134 donors. Serum parathyroid hormone (PTH), Ca, Mg, Zn, Cu, osteocalcin (OC), vitamin D, and type-1 c

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Whitfield, Dennis M., M. Younus Meah, and Jiří J. Křepinský. "Ultrasonic Agitation Accelerates cis-Glycosylation with Heterogeneous Promoters." Collection of Czechoslovak Chemical Communications 58, no. 1 (1993): 159–72. http://dx.doi.org/10.1135/cccc19930159.

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Ultrasonic agitation increases the yield of glycosylations with donors such as 3,4,6-tri-O-acetyl-2-azido-2-deoxy-α-D-galactopyranosyl chloride using the heterogeneous promoters silver zeolite, cadmium zeolite or a mixture of silver perchlorate and silver carbonate on celite. The stereospecificity of the glycosylation depends on the nature of the alcohol to be glycosylated, the nature of the solid support and the solvent. Glycosylation catalyzed by silver zeolite in toluene solutions of the donor 3,4,6-tri-O-acetyl-2-deoxy-2-phtalimido-β-D-glucopyranosyl bromide, that usually produce trans-β-g

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Osenbrück, Karsten, Eva Blendinger, Carsten Leven, et al. "Nitrate reduction potential of a fractured Middle Triassic carbonate aquifer in Southwest Germany." Hydrogeology Journal 30, no. 1 (2021): 163–80. http://dx.doi.org/10.1007/s10040-021-02418-9.

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AbstractNitrate reduction constitutes an important natural mechanism to mitigate the widespread and persistent nitrate contamination of groundwater resources. In fractured aquifers, however, the abundance and accessibility of electron donors and their spatial correlation with groundwater flow paths are often poorly understood. In this study, the nitrate reduction potential of a fractured carbonate aquifer in the Upper Muschelkalk of SW Germany was investigated, where denitrification is due to the oxidation of ferrous iron and reduced sulfur. Petrographical analyses of rock samples revealed con

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Weidlich, Tomáš, and Barbora Kamenická. "Utilization of CO2-Available Organocatalysts for Reactions with Industrially Important Epoxides." Catalysts 12, no. 3 (2022): 298. http://dx.doi.org/10.3390/catal12030298.

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Recent knowledge in chemistry has enabled the material utilization of greenhouse gas (CO2) for the production of organic carbonates using mild reaction conditions. Organic carbonates, especially cyclic carbonates, are applicable as green solvents, electrolytes in batteries, feedstock for fine chemicals and monomers for polycarbonate production. This review summarizes new developments in the ring opening of epoxides with subsequent CO2-based formation of cyclic carbonates. The review highlights recent and major developments for sustainable CO2 conversion from 2000 to the end of 2021 abstracted

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13

Del Zotto, Alessandro, Plinio Di Bernardo, Marilena Tolazzi, Giuliana Tomat, and Pierluigi Zanonato. "Silver(I) complex formation with phosphorus donors in propylene carbonate: a thermodynamic and spectroscopic investigation." Journal of the Chemical Society, Dalton Transactions, no. 20 (1993): 3009. http://dx.doi.org/10.1039/dt9930003009.

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14

Sokol, Tomilenko, Sokol, Zaikin, and Bul’bak. "Formation of Hydrocarbons in the Presence of Native Iron under Upper Mantle Conditions: Experimental Constraints." Minerals 10, no. 2 (2020): 88. http://dx.doi.org/10.3390/min10020088.

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The formation of hydrocarbons (HCs) upon interaction of metal and metal–carbon phases (solid Fe, Fe3C, Fe7C3, Ni, and liquid Fe–Ni alloys) with or without additional sources of carbon (graphite, diamond, carbonate, and H2O–CO2 fluids) was investigated in quenching experiments at 6.3 GPa and 1000–1400 °C, wherein hydrogen fugacity (fH2) was controlled by the Fe–FeO + H2O or Mo–MoO2 + H2O equilibria. The aim of the study was to investigate abiotic generation of hydrocarbons and to characterize the diversity of HC species that form in the presence of Fe/Ni metal phases at P–T–fH2 conditions typic

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15

Weber, Julia, Dennis Svatunek, Simon Krauter, et al. "2-O-Benzyloxycarbonyl protected glycosyl donors: a revival of carbonate-mediated anchimeric assistance for diastereoselective glycosylation." Chemical Communications 55, no. 83 (2019): 12543–46. http://dx.doi.org/10.1039/c9cc07194f.

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16

Islam, Maidul, Ganesh P. Shinde, and Srinivas Hotha. "Expedient synthesis of the heneicosasaccharyl mannose capped arabinomannan of the Mycobacterium tuberculosis cellular envelope by glycosyl carbonate donors." Chemical Science 8, no. 3 (2017): 2033–38. http://dx.doi.org/10.1039/c6sc04866h.

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17

Hayes, John M., and Jacob R. Waldbauer. "The carbon cycle and associated redox processes through time." Philosophical Transactions of the Royal Society B: Biological Sciences 361, no. 1470 (2006): 931–50. http://dx.doi.org/10.1098/rstb.2006.1840.

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Earth's biogeochemical cycle of carbon delivers both limestones and organic materials to the crust. In numerous, biologically catalysed redox reactions, hydrogen, sulphur, iron, and oxygen serve prominently as electron donors and acceptors. The progress of these reactions can be reconstructed from records of variations in the abundance of 13 C in sedimentary carbonate minerals and organic materials. Because the crust is always receiving new CO 2 from the mantle and a portion of it is being reduced by photoautotrophs, the carbon cycle has continuously released oxidizing power. Most of it is rep

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18

RESMINI, Marina, Roberta VIGNA, Caroline SIMMS, et al. "Characterization of the hydrolytic activity of a polyclonal catalytic antibody preparation by pH-dependence and chemical modification studies: evidence for the involvement of Tyr and Arg side chains as hydrogen-bond donors." Biochemical Journal 326, no. 1 (1997): 279–87. http://dx.doi.org/10.1042/bj3260279.

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The hydrolyses of 4-nitrophenyl 4′-(3-aza-2-oxoheptyl)phenyl carbonate and of a new, more soluble, substrate, 4-nitrophenyl 4′-(3-aza-7-hydroxy-2-oxoheptyl)phenyl carbonate, each catalysed by a polyclonal antibody preparation elicited in a sheep by use of an analogous phosphate immunogen, were shown to adhere closely to the Michaelis–Menten equation, in accordance with the growing awareness that polyclonal catalytic antibodies may be much less heterogeneous than had been supposed. The particular value of studies on polyclonal catalytic antibodies is discussed briefly. Both the kcat and kcat/Km

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Kolo, K., and Ph Claeys. "In vitro formation of Ca-oxalates and the mineral glushinskite by fungal interaction with carbonate substrates and seawater." Biogeosciences 2, no. 3 (2005): 277–93. http://dx.doi.org/10.5194/bg-2-277-2005.

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Abstract. This study investigates the in vitro formation of Ca-oxalates and glushinskite through fungal interaction with carbonate substrates and seawater as a process of biologically induced metal recycling and neo-mineral formation. The study also emphasizes the role of the substrates as metal donors. In the first experiment, thin sections prepared from dolomitic rock samples of Terwagne Formation (Carboniferous, Viséan, northern France) served as substrates. The thin sections placed in Petri dishes were exposed to fungi grown from naturally existing airborne spores. In the second experiment

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Muryanto, Fanny Amelia, Siti Nurbayti, Yanni Sudiyani, and Misri Gozan. "Utilization of Potassium Carbonate-Ethylene Glycol as Deep Eutectic Solvent to Delignification Oil Palm Empty Fruit Bunch for Furfural and Ethanol Production." Jurnal Sains Materi Indonesia 25, no. 2 (2024): 100–106. http://dx.doi.org/10.55981/jsmi.2024.1260.

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Pretreatment using Deep Eutectic Solvent (DES) was done to reduce the lignin content in oil palm empty fruit bunch (OPEFB). DES solution was prepared by combining Potassium Carbonate (K2CO3) as hydrogen bond acceptors (HBA) and Ethylene Glycol (EG) as hydrogen bond donors (HBD). This study aimed to obtain optimum conditions in the pretreatment process and determine the levels of lignin, cellulose, hemicellulose, and glucose in OPEFB. The pretreatment stage was performed at different temperature parameters, 100, 120, and 150°C, for 60 minutes to produce optimum conditions. Biomass pretreated wi

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Kim, Seulgi, Jong Hwa Jung, Shim Sung Lee, and In-Hyeok Park. "Regioisomers of singly bridged calix[6]crown-6 and their heavy alkali metal complexes: a molecular baseball glove for caesium(I)." IUCrJ 9, no. 1 (2021): 43–48. http://dx.doi.org/10.1107/s2052252521010563.

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We report the formation of heavy alkali metal complexes of bicyclic host molecules including the caesium(I) complex that catches the central metal ion with the deep pocket of the host similar to a baseball glove. For this, three regioisomers of singly bridged calix[6]crown-6 [1,2-bridged (H4 L 1,2), 1,3-bridged (H4 L 1,3) and 1,4-bridged (H4 L 1,4)] have been synthesized by alkylation of calix[6]arene with pentaethylene glycol ditosylate in the presence of M 2CO3 (M = Na, K, Rb and Cs). The larger the cation size of the metal carbonate, the higher the yield of the H4 L 1,4 isomer, indicating t

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Prokopieva, V., E. Yarygina, and E. Plotnikov. "Protection of proteins and lipids of blood plasma by different lithium salts under ethanol-induced oxidative damage." European Psychiatry 41, S1 (2017): S758—S759. http://dx.doi.org/10.1016/j.eurpsy.2017.01.1421.

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IntroductionThe creation of new lithium compounds with antioxidant activity is relevant problem for psychiatry. The aim of this work was study of the protective effect of lithium salts against ethanol-induced oxidative damage to proteins and lipids of human blood plasma in vitro.MethodsWe used lithium ascorbate and lithium carbonate 0.6 mmol/L which correspond to the therapeutic dose (in terms of lithium ions). Antioxidant carnosine (β-Ala-L-His) was used as comparison drug. We used the blood of 12 healthy donors. The heparinized blood samples were incubated in presence of tested preparations

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Dilling, Sabrina, Frank Imkamp, Silke Schmidt, and Volker Müller. "Regulation of Caffeate Respiration in the Acetogenic Bacterium Acetobacterium woodii." Applied and Environmental Microbiology 73, no. 11 (2007): 3630–36. http://dx.doi.org/10.1128/aem.02060-06.

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ABSTRACT The anaerobic acetogenic bacterium Acetobacterium woodii can conserve energy by oxidation of various substrates coupled to either carbonate or caffeate respiration. We used a cell suspension system to study the regulation and kinetics of induction of caffeate respiration. After addition of caffeate to suspensions of fructose-grown cells, there was a lag phase of about 90 min before caffeate reduction commenced. However, in the presence of tetracycline caffeate was not reduced, indicating that de novo protein synthesis is required for the ability to respire caffeate. Induction also too

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Geng, Yiqun, Qi Qin та Xin-Shan Ye. "Lewis Acids as α-Directing Additives in Glycosylations by Using 2,3-O-Carbonate-Protected Glucose and Galactose Thioglycoside Donors Based on Preactivation Protocol". Journal of Organic Chemistry 77, № 12 (2012): 5255–70. http://dx.doi.org/10.1021/jo3002084.

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Černáková, Lucia, Michaela Macková, Tatiana Klempová, Peter Haluz, Vladimír Mastihuba, and Mária Mastihubová. "Enzymatic Methoxycarbonylation of Tyrosol and Hydroxytyrosol." International Journal of Molecular Sciences 25, no. 18 (2024): 10057. http://dx.doi.org/10.3390/ijms251810057.

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Tyrosol and hydroxytyrosol are powerful phenolic antioxidants occurring in olive oil and in by-products from olive processing. Due to their high polarity, esterification or other lipophilization is necessary to make them compatible with lipid matrices. Hydroxytyrosol methyl carbonate is a more effective antioxidant than dibutylhydroxytoluene or α-tocopherol and together with tyrosol methyl carbonate exerts interesting pharmacological properties. The purpose of this work was the enzymatic preparation of alkyl carbonates of tyrosol and hydroxytyrosol. A set of 17 hydrolases was tested in the cat

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Kopyrulina, M. E., E. N. Zakharova, T. N. Zabotina, D. Yu Blokhin та P. K. Ivanov. "Тhe technology of creation and quality testing of immunofluorescent probes with dye alexa-488 for analysis of celular populations by flow cytometry". Russian Journal of Biotherapy 17, № 1 (2018): 70–75. http://dx.doi.org/10.17650/1726-9784-2018-17-1-70-75.

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Fluorescent probes based on monoclonal antibodies (MAb) are widely used in scientific and clinical research in the field of oncology, hematology, immunology, epidemiology. Objective: to create of fluorescent probes based on the MAb and the fluorescent dye Alexa-488 for the analysis of cellular populations by flow cytometry. Materials and methods. MAb to B lymphocyte antigen (clone ICO-180), fluorescent dye Alexa-488 were used in the work. MAb was isolated from ascitic fluid by combined purification of the immunoglobulin fraction with caprylic acid and salting out with ammonium sulfate. Gel fil

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Jaffray, Paul M., Lisa F. McClintock, Kay E. Baxter, and Allan G. Blackman. "Cobalt(III) Carbonate and Bicarbonate Chelate Complexes of Tripodal Tetraamine Ligands Containing Pyridyl Donors: The Steric Basis for the Stability of Chelated Bicarbonate Complexes." Inorganic Chemistry 44, no. 12 (2005): 4215–25. http://dx.doi.org/10.1021/ic0482537.

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Ghaedi, Hosein, Muhammad Ayoub, Suriati Sufian, Azmi Mohd Shariff, Bhajan Lal, and Cecilia Devi Wilfred. "Density and refractive index measurements of transition-temperature mixture (deep eutectic analogues) based on potassium carbonate with dual hydrogen bond donors for CO2 capture." Journal of Chemical Thermodynamics 118 (March 2018): 147–58. http://dx.doi.org/10.1016/j.jct.2017.11.008.

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Kashefi, Kazem, and Derek R. Lovley. "Reduction of Fe(III), Mn(IV), and Toxic Metals at 100°C by Pyrobaculum islandicum." Applied and Environmental Microbiology 66, no. 3 (2000): 1050–56. http://dx.doi.org/10.1128/aem.66.3.1050-1056.2000.

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ABSTRACT It has recently been noted that a diversity of hyperthermophilic microorganisms have the ability to reduce Fe(III) with hydrogen as the electron donor, but the reduction of Fe(III) or other metals by these organisms has not been previously examined in detail. WhenPyrobaculum islandicum was grown at 100°C in a medium with hydrogen as the electron donor and Fe(III)-citrate as the electron acceptor, the increase in cell numbers of P. islandicum per mole of Fe(III) reduced was found to be ca. 10-fold higher than previously reported. Poorly crystalline Fe(III) oxide could also serve as the

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Brauchle, Eva, Daniel Carvajal Berrio, Melanie Rieger, Katja Schenke-Layland, Siegmar Reinert, and Dorothea Alexander. "Raman Spectroscopic Analyses of Jaw Periosteal Cell Mineralization." Stem Cells International 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/1651376.

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To achieve safer patient treatments, serum-free cell culture conditions have to be established for cell therapies. In previous studies, we demonstrated that serum-free culture favored the proliferation of MSCA-1+ osteoprogenitors derived from the jaw periosteum. In this study, the in vitro formation of bone-specific matrix by MSCA-1+ jaw periosteal cells (JPCs, 3 donors) was assessed and compared under serum-free and serum-containing media conditions using the marker-free Raman spectroscopy. Based on a standard fluorescence assay, JPCs from one patient were not able to mineralize under serum-c

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Rabold, Sandra, Vladimir M. Gorlenko, and Johannes F. Imhoff. "Thiorhodococcus mannitoliphagus sp. nov., a purple sulfur bacterium from the White Sea." International Journal of Systematic and Evolutionary Microbiology 56, no. 8 (2006): 1945–51. http://dx.doi.org/10.1099/ijs.0.63981-0.

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A novel purple sulfur bacterium, strain WST, was isolated from a microbial mat from an estuary of the White Sea. Individual cells are coccoid shaped, motile by flagella and do not contain gas vesicles. The mean cell diameter is 1.85 μm (range 1.5–2.0 μm). Cell suspensions exhibit a purple–violet colour. They contain bacteriochlorophyll a and carotenoids of the rhodopinal series as photosynthetic pigments. The novel bacterium is an anoxygenic photoautotroph, using sulfide, thiosulfate, sulfite and elemental sulfur as electron donors for photosynthesis and is capable of photoassimilating several

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Segoviano-Garfias, José J. N., Gabriela A. Zanor, Fidel Ávila-Ramos, and Egla Yareth Bivián-Castro. "Stability of Manganese(II)–Pyrazine, –Quinoxaline or –Phenazine Complexes and Their Potential as Carbonate Sequestration Agents." Molecules 27, no. 5 (2022): 1648. http://dx.doi.org/10.3390/molecules27051648.

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Carbonate sequestration technology is a complement of CO2 sequestration technology, which might assure its long-term viability. In this work, in order to explore the interactions between Mn2+ ion with several ligands and carbonate ion, we reported a spectrophotometric equilibrium study of complexes of Mn2+ with pyrazine, quinoxaline or phenazine and its carbonate species at 298 K. For the complexes of manganese(II)–pyrazine, manganese(II)–quinoxaline and manganese(II)–phenazine, the formation constants obtained were log β110 = 4.6 ± 0.1, log β110 = 5.9 ± 0.1 and log β110 = 6.0 ± 0.1, respectiv

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Geng, Yiqun, Qi Qin та Xin-Shan Ye. "ChemInform Abstract: Lewis Acids as α-Directing Additives in Glycosylations by Using 2,3-O-Carbonate-Protected Glucose and Galactose Thioglycoside Donors Based on Preactivation Protocol." ChemInform 43, № 42 (2012): no. http://dx.doi.org/10.1002/chin.201242203.

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Graziani, Gabriela, Marco Govoni, Leonardo Vivarelli, et al. "A Comprehensive Microstructural and Compositional Characterization of Allogenic and Xenogenic Bone: Application to Bone Grafts and Nanostructured Biomimetic Coatings." Coatings 10, no. 6 (2020): 522. http://dx.doi.org/10.3390/coatings10060522.

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Bone grafts and bone-based materials are widely used in orthopedic surgery. However, the selection of the bone type to be used is more focused on the biological properties of bone sources than physico-chemical ones. Moreover, although biogenic sources are increasingly used for deposition of biomimetic nanostructured coatings, the influence of specific precursors used on coating’s morphology and composition has not yet been explored. Therefore, in order to fill this gap, we provided a detailed characterization of the properties of the mineral phase of the most used bone sources for allografts,

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Orlando, M. T. D., L. Kuplich, D. O. de Souza, et al. "Study of calcium oxalate monohydrate of kidney stones by X-ray diffraction." Powder Diffraction 23, S1 (2008): S59—S64. http://dx.doi.org/10.1154/1.2903738.

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X-ray powder diffraction was used to study the phase composition of human renal calculi. The stones were collected from 56 donors in Vitória, Espírito Santo state, southeastern Brazil. An XRD phase quantification revealed that 61% of the studied renal stones were composed exclusively of calcium oxalate [34% formed only by calcium oxalate monohydrate (COM) and 27% presents both monohydrate and dihydratate calcium oxalate]. The 39% multi-composed calculi have various other phases such as uric acid and calcium phosphate. Rietveld refinement of XRD data of one apparent monophasic (COM) renal calcu

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Li, Fangru, Shang Wang, Qing He, et al. "Minerals Determined a Special Ecological Niche and Selectively Enriched Microbial Species from Bulk Water Communities in Hot Springs." Microorganisms 9, no. 5 (2021): 1020. http://dx.doi.org/10.3390/microorganisms9051020.

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Minerals provide physical niches and supply nutrients or serve as electron donors/acceptors for microorganism survival and growth, and thus minerals and microbes co-evolved. Yet, little is known about how sediment minerals impact microbial community assembly in hot springs and to what extent mineralogical composition influences microbial community composition and diversity. Here the influences of minerals on thermophiles in Tengchong hot springs were revealed by network analysis of field samples, as well as in-situ microcosm experiments with minerals. A molecular ecological network was constru

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Yu, Kai, Hongli Xiong, Xin Wei, et al. "Chronological Age Estimation of Male Occipital Bone Based on FTIR and Raman Microspectroscopy." Bioinorganic Chemistry and Applications 2022 (August 26, 2022): 1–12. http://dx.doi.org/10.1155/2022/1729131.

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Age-related changes in bone tissue have always been an important part of bone research, and age estimation is also of great significance in forensic work. In our study, FTIR and Raman microspectroscopy were combined to explore the structural and chronological age-related changes in the occipital bones of 40 male donors. The FTIR micro-ATR mode not only achieves the comparison of FTIR and Raman efficiency but also provides a new pattern for the joint detection of FTIR and Raman in hard tissue. Statistical analysis and PCA results revealed that the structure had little effect on the FTIR and Ram

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Valencia-Llano, Carlos Humberto, Diego López-Tenorio, Marcela Saavedra, Paula A. Zapata, and Carlos David Grande-Tovar. "Comparison of Two Bovine Commercial Xenografts in the Regeneration of Critical Cranial Defects." Molecules 27, no. 18 (2022): 5745. http://dx.doi.org/10.3390/molecules27185745.

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Autologous bone is the gold standard in regeneration processes. However, there is an endless search for alternative materials in bone regeneration. Xenografts can act as bone substitutes given the difficulty of obtaining bone tissue from patients and before the limitations in the availability of homologous tissue donors. Bone neoformation was studied in critical-size defects created in the parietal bone of 40 adult male Wistar rats, implanted with xenografts composed of particulate bovine hydroxyapatite (HA) and with blocks of bovine hydroxyapatite (HA) and Collagen, which introduces crystalli

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Barry, J.-L., C. Hoebler, G. T. MacFarlane, et al. "Estimation of the fermentability of dietary fibrein vitro: a European interlaboratory study." British Journal of Nutrition 74, no. 3 (1995): 303–22. http://dx.doi.org/10.1079/bjn19950137.

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Five European laboratories tested a simplein vitrobatch system for dietary fibre fermentation studies. The inoculum was composed of fresh human faeces mixed with a carbonate-phosphate buffer complex supplemented with trace elements and urea. Five dietary fibre sources (cellulose, sugarbeet fibre, soyabean fibre, maize bran and pectin) were used by each laboratory on three occasions to determine pH, residual non-starch polysaccharides (NSP) and short-chain fatty acid production during fermentation. Cellulose and maize bran degradabilities were very low (7·2 (SE 10·8) and 6·2 (SE 9·1) % respecti

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Zavarzina, Daria G., Tatyana N. Zhilina, Nadegda A. Kostrikina, Stepan V. Toshchakov, and Ilya V. Kublanov. "Isachenkonia alkalipeptolytica gen. nov. sp. nov., a new anaerobic, alkaliphilic proteolytic bacterium capable of reducing Fe(III) and sulfur." International Journal of Systematic and Evolutionary Microbiology 70, no. 8 (2020): 4730–38. http://dx.doi.org/10.1099/ijsem.0.004341.

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An obligately alkaliphilic, anaerobic, proteolytic bacterium was isolated from a sample of Tanatar III soda lake sediment (Altai region, Russia) and designated as strain Z-1701T. Cells of strain Z-1701T were short, straight, motile Gram-stain-positive rods. Growth of Z-1701T obligately depended on the presence of sodium carbonate. Strain Z-1701T could utilize various peptides mixtures, such as beef and yeast extracts, peptone, soytone, trypticase and tryptone, as well as such proteins as albumin, gelatin and sodium caseinate. It was able to grow oligotrophically with 0.02 g l−1 yeast extract a

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Wang, Ya Ya, and Xin Jin. "Construction of a Binary Organocatalytic System Based on Urea-Based Hydrogen Bond Donors and Polyether Ionic Liquids and its Application to CO<sub>2</sub> Cycloaddition Reactions." Materials Science Forum 1138 (December 17, 2024): 49–54. https://doi.org/10.4028/p-txk48h.

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To alleviate the environmental problems caused by the excessive emission of CO2, this study designed and synthesized a binary organocatalytic system based on urea-based hydrogen bond donors and polyether ionic liquids based on a cycloaddition reaction that converts CO2 and small-molecule epoxides into cyclic carbonates with high industrial application value. The binary system is based on a polyether ionic liquid, introducing an organic base (to trap and activate CO2), hydrogen bond donor (to activate the epoxide), and nucleophilic reagent unit (to help open the ring of epoxides), with a variet

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Danalache, Marina, Sophie-Maria Kliesch, Marita Munz, Andreas Naros, Siegmar Reinert, and Dorothea Alexander. "Quality Analysis of Minerals Formed by Jaw Periosteal Cells under Different Culture Conditions." International Journal of Molecular Sciences 20, no. 17 (2019): 4193. http://dx.doi.org/10.3390/ijms20174193.

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Previously, we detected a higher degree of mineralization in fetal calf serum (FCS) compared to serum-free cultured jaw periosteum derived osteoprogenitor cells (JPCs). By Raman spectroscopy, we detected an earlier formation of mineralized extracellular matrix (ECM) of higher quality under serum-free media conditions. However, mineralization potential remained too low. In the present study, we aimed to investigate the biochemical composition and subsequent biomechanical properties of the JPC-formed ECM and minerals under human platelet lysate (hPL) and FCS supplementation. JPCs were isolated (

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Sombutsuwan, Piraporn, Erwann Durand, and Kornkanok Aryusuk. "Effect of acidity/alkalinity of deep eutectic solvents on the extraction profiles of phenolics and biomolecules in defatted rice bran extract." PeerJ Analytical Chemistry 6 (January 3, 2024): e29. http://dx.doi.org/10.7717/peerj-achem.29.

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This study investigated the influence of deep eutectic solvent (DES) acidity/alkalinity on the extraction profiles of phenolics and other biomolecules (phytic acid, reducing sugar, and protein) in defatted rice bran (DFRB). The DES with varying pH levels were prepared using different hydrogen bond acceptors (choline chloride (ChCl) and potassium carbonate (K2CO3)) and hydrogen bond donors (lactic acid, urea, and glycerol). The results reveal that the acidic DES (ChCl-lactic acid; pH 0.42) demonstrated superior extraction efficiency for total phenolic acids (4.33 mg/g), phytic acid (50.30 mg/g)

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Jordan, Sumanas, Steven Schulz, Amanda Carraher, and David Cabiling. "Comparison of Polypropylene and Bioabsorbable Mesh for Abdominal Wall Reinforcement following Microsurgical Breast Reconstruction." Journal of Reconstructive Microsurgery 35, no. 05 (2018): 335–40. http://dx.doi.org/10.1055/s-0038-1676470.

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Background Abdominal wall morbidity following microvascular breast reconstruction continues to be an area of interest due to both functional and aesthetic concerns. Donor-site closure technique has been shown to affect bulge and hernia rates and ranges from primary closure to various uses of mesh. Few studies to date have compared types of mesh. The present study compares BARD polypropylene to bioabsorbable GORE Bio-A (polyglycolic acid/trimethylene carbonate) mesh used as a fascial underlay with primary fascial closure. Methods A retrospective review of all consecutive deep inferior epigastri

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Boese, O., S. I. Troyanov, and E. Kemnitz. "Crystal Structure of a New Dimethyl Carbonate/2,4,6-Tris(trifluoromethyl)- 1,3,5-triazine 1:1 Adduct." Zeitschrift für Naturforschung B 58, no. 4 (2003): 356–58. http://dx.doi.org/10.1515/znb-2003-0417.

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The crystal structure of a new 1:1 complex of dimethyl carbonate and 2,4,6-tris(trifluoromethyl)-1,3,5-triazine is reported. A high tendency of sublimation was observed by differential thermal analysis (DTA) and thermogravimetry (TG). Donor-acceptor interactions between dimethyl carbonate and 2,4,6-tris(trifluoro-methyl)-1,3,5-triazine are assumed to be responsible for the complex formation.

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Alves, M., B. Grignard, S. Gennen, et al. "Organocatalytic promoted coupling of carbon dioxide with epoxides: a rational investigation of the cocatalytic activity of various hydrogen bond donors." Catalysis Science & Technology 5, no. 9 (2015): 4636–43. http://dx.doi.org/10.1039/c5cy00891c.

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A rational investigation of the cocatalytic activity of a series of commercially available hydrogen bond donors (HBDs) for the synthesis of cyclic carbonates from CO<sub>2</sub> and epoxides under mild conditions.

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Nikolenko, Nikolai V., and Irina M. Shapovalova. "Surface Properties of Manganese(II) Carbonate." Adsorption Science & Technology 20, no. 6 (2002): 541–47. http://dx.doi.org/10.1260/026361702321039465.

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The energies of unoccupied and occupied orbitals have been used as correlation parameters between the electronic and adsorptive properties of organic molecules. A model describing the chemisorption of organic compounds on MnCO3 was proposed. This involves three types of interaction: 1-, 2- and 3-electron donor–acceptor interaction between adsorbent and adsorbate frontier orbitals.

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Jeny, Sebastin Raj, Subramani Selvi, Murugaiya Deerkadharshini та Kannupal Srinivasan. "Synthesis of β-enamino malonates through caesium carbonate-promoted reaction of nitro-substituted donor–acceptor cyclopropanes". RSC Advances 14, № 45 (2024): 33587–91. http://dx.doi.org/10.1039/d4ra05619a.

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A caesium carbonate-promoted reaction of nitro-substituted donor–acceptor cyclopropanes (DACs) with primary aromatic amines in water provides convenient access to β-enamino malonates under mild reaction conditions.

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Wildung, R. E., Y. A. Gorby, K. M. Krupka, et al. "Effect of Electron Donor and Solution Chemistry on Products of Dissimilatory Reduction of Technetium byShewanella putrefaciens." Applied and Environmental Microbiology 66, no. 6 (2000): 2451–60. http://dx.doi.org/10.1128/aem.66.6.2451-2460.2000.

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ABSTRACT To help provide a fundamental basis for use of microbial dissimilatory reduction processes in separating or immobilizing99Tc in waste or groundwaters, the effects of electron donor and the presence of the bicarbonate ion on the rate and extent of pertechnetate ion [Tc(VII)O4 −] enzymatic reduction by the subsurface metal-reducing bacterium Shewanella putrefaciens CN32 were determined, and the forms of aqueous and solid-phase reduction products were evaluated through a combination of high-resolution transmission electron microscopy, X-ray absorption spectroscopy, and thermodynamic calc

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Kim, Jeong, Youngran Lee, Leonard F. Lindoy, Shim Sung Lee, and Tania Strixner. "New Macrocyclic Ligands. IX. N-Benzylated Macrocycles Incorporating O2N2-, O3N2- and O2N3-Donor Sets." Australian Journal of Chemistry 52, no. 11 (1999): 1055. http://dx.doi.org/10.1071/ch99098.

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The syntheses of N-benzylated macrocyclic ligands incorporating O2N2-, O3N2- and O2N3-donor sets, and ring sizes from 15- to 18-membered, is described. The new derivatives were obtained by benzylation of the previously reported parent macrocycles with benzyl bromide in acetonitrile containing suspended sodium carbonate or bicarbonate. The X-ray structure determination of a tribenzylated product containing a 17-membered, O2N3-donor macrocyclic ring is described.

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