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3,357 Newest Publications about the topic sulfur

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Seawater spray injury to Quercus acutissima leaves: Crystal deposition, stomatal clogging, and chloroplast degeneration

01-May-2011 | Ki Woo Kim; Kyosang Koo; Pan‐Gi Kim, Microscopy Research and Technique, 2011

Abstract Effects of seawater spray on leaf structure were investigated in Quercus acutissima by electron microscopy and X‐ray microanalysis. Two‐year‐old seedlings of Q. acutissima were sprayed with seawater and kept in a greenhouse maintained at 25°C. The most recognizable symptoms of ...

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Sulfoximine‐Directed Single and Double ortho‐Lithiation: Stereoselective Rearrangements of o,o′‐Dilithiophenylsulfoximines to o,N‐Dilithiosulfinylanilines through Anionic Fries Rearrangements of o,o′‐Dilithiophenylsulfinamides

01-May-2011 | Michael Wessels; Vishal Mahajan; Stephan Boßhammer; Gerhard Raabe; Hans‐Joachim Gais, European Journal of Organic Chemistry, 2011

Abstract Treatment of various phenylsulfoximines with nBuLi (1 equiv.) at –78 °C in THF resulted in single ortho‐lithiations and gave the corresponding o‐lithiosulfoximines. According to NMR spectroscopy, the o‐lithiosulfoximines are generally stable at 0 °C. The o‐lithiosulfoximines were ...

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Decomposition of perfluoropolyether lubricants

01-May-2011 | Mimi Y. Keating, Jon L. Howell, Journal of Thermal Analysis and Calorimetry, 2011

Decomposition has been studied in the chemistry of perfluoropolyethers (PFPE), thus far no molecular structure information is reported. TG-MS is a tool to follow the off gassing of decomposition for clues. We selected two PFPEs that have different properties: Krytox® XHT-1000 and Fomblin Z60 ...

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TGA-MS study of the decomposition of phosphorus-containing ionic liquids trihexyl(tetradecyl)phosphonium decanoate and trihexyltetradecylphosphonium bis[(trifluoromethyl)sulfonyl] amide

01-May-2011 | Mimi Y. Keating, Feng Gao, Jane B. Ramsey, Journal of Thermal Analysis and Calorimetry, 2011

The phosphorus-containing ionic liquids (IL) decompose where ion pairs fall apart. Trihexyl(tetradecyl)phosphonium decanoate, sold as Cyphos IL 103, and Trihexyltetradecylphosphonium bis[(trifluoromethyl)sulfonyl] amide, sold as Cyphos IL 109, decompose in 200–475 °C range in air and the ...

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Phosphane‐Catalyzed Umpolung Addition Reaction of Nucleophiles to Ethyl 2‐Methyl‐2,3‐butadienoate

01-May-2011 | Guan, Xiao‐Yang; Wei, Yin; Shi, Min, European Journal of Organic Chemistry, 2011

Abstract The phosphane‐catalyzed umpolung addition of various nucleophiles to ethyl 2‐methyl‐2,3‐butadienoate is described. Oxygen, nitrogen, and carbon nucleophiles smoothly reacted with ethyl 2‐methyl‐2,3‐butadienoate to give the corresponding umpolung addition products in good to excellent ...

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Two‐Phase Approach to High‐Quality, Oil‐Soluble, Near‐Infrared‐Emitting PbS Quantum Dots by Using Various Water‐Soluble Anion Precursors

01-May-2011 | Deng, Dawei; Cao, Jie; Xia, Junfei; Qian, Zhiyu; Gu, Yueqing; Gu, Zhongze; Akers, Walter John, European Journal of Inorganic Chemistry, 2011

Abstract Colloidal PbS quantum dots (QDs) with tunable photoemission throughout the near‐infrared (NIR) region (ca. 750–1000 nm) were synthesized by a two‐phase approach. Here, oil‐soluble lead oleate formed by a reaction of lead acetate and oleic acid (OA, the capping agent) in n‐decane at 130 ...

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Effect of glutathione on growth of the probiotic bacterium Lactobacillus reuteri

29-Apr-2011 | KiBeom Lee, Ho-Jin Kim, Beom-Seop Rho, Sang-Kee Kang, Yun-Jaie Choi, Biochemistry (Moscow), 2011

Glutathione (GSH) is an abundant nonprotein thiol that plays numerous roles within the cell. Previously, we showed that Lactobacillus salivarius has the capacity to mount a glutathione-mediated acid-tolerance response. In the present work we provide evidence of a requirement for GSH by ...

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Effect of Acid Deposition on Quantity and Quality of Dissolved Organic Matter in Soil–Water

29-Apr-2011 | Sara M. Ekström; Emma S. Kritzberg; Dan B. Kleja; Niklas Larsson; P. Anders Nilsson; Wilhelm Graneli; Bo Bergkvist, Environmental Science & Technology, 2011

The aim of this study was to explore how acid deposition may affect the concentration and quality of dissolved organic matter (DOM) in soil–water. This was done by a small-scale acidification experiment during two years where 0.5 × 0.5 m2 plots were artificially irrigated with water with ...

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Precursors and Formation of Pyrithione and Other Pyridyl-Containing Sulfur Compounds in Drumstick Onion, Allium stipitatum

29-Apr-2011 | Roman Kubec; Petra Krejčová; Petr Šimek; Lukáš Václavík; Jana Hajšlo ..., Journal of Agricultural and Food Chemistry, 2011

Two novel, structurally unusual cysteine derivatives were isolated from the bulbs of Allium stipitatum (Allium subg. Melanocrommyum) and shown to be S-(2-pyridyl)cysteine N-oxide and S-(2-pyridyl)glutathione N-oxide. The former compound is the first example of a naturally occurring alliinase ...

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Studies on Al/ZrO2/GaAs metal-oxide-semiconductor capacitors and determination of its electrical parameters in the frequency range of 10 kHz–1 MHz

29-Apr-2011 | Souvik Kundu, Sandipta Roy, P. Banerji, Supratic Chakraborty, and T. Shripathi, Journal of Vacuum Science & Technology B, 2011

Aluminum (Al)/zirconium oxide (ZrO2)/GaAs metal-oxide-semiconductor (MOS) capacitors were fabricated on p-GaAs. The carrier concentration of n-GaAs was varied by metal organic chemical vapor deposition. The ZrO2 gate dielectrics were prepared by the sol-gel process and then spin-coated onto GaAs ...

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