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5,236 Newest Publications about the topic sulfur

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Thioautotrophic bacterial endosymbionts are degraded by enzymatic digestion during starvation: Case study of two lucinids Codakia orbicularis and C. orbiculata

28-Nov-2014 | Sten König, Hervé Le Guyader, Olivier Gros, Microscopy Research and Technique, 2014

ABSTRACT The Caribbean bivalves Codakia orbicularis (Linné, 1758) and C. orbiculata (Montagu, 1808) live in seagrass beds of Thalassia testudinum and harbor intracellular sulfur‐oxidizing gamma‐proteobacteria. These bacterial symbionts fix CO2 via the Calvin Benson cycle and provide organic ...

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Combining Organometallic Reagents, the Sulfur Dioxide Surrogate DABSO, and Amines: A One‐Pot Preparation of Sulfonamides, Amenable to Array Synthesis

27-Nov-2014 | Alex S. Deeming, Claire J. Russell, Michael C. Willis, Angewandte Chemie International Edition, 2014

Abstract We describe a method for the synthesis of sulfonamides through the combination of an organometallic reagent, a sulfur dioxide equivalent, and an aqueous solution of an amine under oxidative conditions (bleach). This simple reaction protocol avoids the need to employ sulfonyl chloride ...

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Functionalization of the meso‐Phenyl Ring of Rhodamine Dyes Through SNAr with Sulfur Nucleophiles: Synthesis, Biophysical Characterizations, and Comprehensive NMR Analysis

26-Nov-2014 | Gyuzel Yu. Mitronova, Svetlana Polyakova, Christian A. Wurm, Kirill Kolmakov, Thomas Wolfram, Dirk N. H. Meineke, Vl ..., European Journal of Organic Chemistry, 2014

Abstract Aromatic nucleophilic substitution (SNAr) of fluorine in 9‐(3′‐carboxy‐4′,5′,6′,7′‐tetrafluorophenyl) groups of xanthene dyes constitutes a powerful tool in dye design. Thiols and amines regioselectively replace F‐6′. This approach enables additional hydrophilic residues or functional ...

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Well-controlled synthesis of wurtzite-type Cu2ZnSnS4 nanoparticles using multiple sulfur sources via a two-step heating process

26-Nov-2014 | Hiroyasu Nishi; Takahito Nagano; Tatsuya Kameyama; Susumu Kuwabata; Tsukasa Torimoto, CrystEngComm, 2014

Wurtzite-type copper zinc tin sulfide (Cu2ZnSnS4) nanoparticles were prepared in dodecanethiol (DDT) solutions by reacting corresponding metal acetates with a mixture of sulfur compounds with different reactivities, elemental sulfur (S) and dibutylthiourea (DBTU), via a two-step heat treatment. ...

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Links between N Deposition and Nitrate Export from a High-Elevation Watershed in the Colorado Front Range

26-Nov-2014 | M. Alisa Mast; David W. Clow; Jill S. Baron; Gregory A. Wetherbee, Environmental Science & Technology, 2014

Long-term patterns of stream nitrate export and atmospheric N deposition were evaluated over three decades in Loch Vale, a high-elevation watershed in the Colorado Front Range. Stream nitrate concentrations increased in the early 1990s, peaked in the mid-2000s, and have since declined by over ...

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Nitrogen Oxides, Sulfur Trioxide, and Mercury Emissions during Oxy-fuel Fluidized Bed Combustion of Victorian Brown Coal

26-Nov-2014 | Bithi Roy; Luguang Chen; Sankar Bhattacharya, Environmental Science & Technology, 2014

This study investigates, for the first time, the NOx, N2O, SO3, and Hg emissions from combustion of a Victorian brown coal in a 10 kWth fluidized bed unit under oxy-fuel combustion conditions. Compared to air combustion, lower NOx emissions and higher N2O formation were observed in the oxy-fuel ...

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Molecules, Vol. 19, Pages 19588-19593: Special Issue: Redox Active Natural Products and Their Interaction with Cellular Signalling Pathways

26-Nov-2014 | Jacob, Claus, Molecules, 2014

During the last decade, research into natural products has experienced a certain renaissance. The urgent need for more and more effective antibiotics in medicine, the demand for ecologically friendly plant protectants in agriculture, “natural” cosmetics and the issue of a sustainable and healthy ...

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Oxidation of refractory sulfur-containing compounds with molecular oxygen catalyzed by vanadoperiodate

25-Nov-2014 | Nanfang Tang; Zongxuan Jiang; Can Li, Green Chemistry, 2014

A new vanadoperiodate [HIV9O28]3- has been synthesized by a simple, one-pot stoichiometric reaction of HIO4•2H2O with NaVO3 in aqueous solution, and then isolated as [C8H17N(CH3)3]3HIV9O28 by cation exchange. We found that [C8H17N(CH3)3]3HIV9O28 shows high catalytic activity in oxidation of ...

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Oxidative Uncoupling in Cysteine Dioxygenase Is Gated by a Proton-Sensitive Intermediate

25-Nov-2014 | Joshua K. Crowell; Wei Li; Brad S. Pierce, Biochemistry, 2014

Cysteine dioxygenase (CDO) is a non-heme mononuclear iron enzyme that catalyzes the O2-dependent oxidation of l-cysteine (Cys) to produce cysteine sulfinic acid (CSA). This enzyme catalyzes the first committed step in Cys catabolism; thus, it is central to mammalian sulfur metabolism and redox ...

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