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4,317 Newest Publications about the topic sulfur

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Sulfur isotopes of organic matter preserved in 3.45-billion-year-old stromatolites reveal microbial metabolism [Evolution]

18-Sep-2012 | Tomaso R. R. Bontognali; Alex L. Sessions; Abigail C. Allwood; Woodward W. Fischer; John P. Grotzinger; Roger E. Sum ..., Proceedings of the National Academy of Sciences current issue, 2012

The 3.45-billion-year-old Strelley Pool Formation of Western Australia preserves stromatolites that are considered among the oldest evidence for life on Earth. In places of exceptional preservation, these stromatolites contain laminae rich in organic carbon, interpreted as the fossil remains of ...

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Chemoassay Screening of DNA-Reactive Mutagenicity with 4-(4-Nitrobenzyl)pyridine – Application to Epoxides, Oxetanes, and Sulfur Heterocycles

18-Sep-2012 | Diana Thaens; Daniel Heinzelmann; Alexander Böhme; Albrecht Paschke; Gerrit Schüürmann, Chemical Research in Toxicology, 2012

Organic electrophiles have the potential to covalently attack DNA bases, and thus initiate mutagenic and carcinogenic processes. In this context, aromatic nitrogen sites of the DNA bases are often particularly nucleophilic, with guanine N7 being one of the most favored sites of adduct formation ...

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NOx and N2O precursors from co-pyrolysis of biomass and sludge

17-Sep-2012 | Qiangqiang Ren, Journal of Thermal Analysis and Calorimetry, 2012

Biomass is an effective substitute for fossil fuels and has a substantial impact on CO2 reduction. Meanwhile, alkali metal-related problem is a major barrier in biomass combustion. Sludge is a waste with low heating value, high water, sulfur, and nitrogen contents, as well as high phosphorus ...

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Particulate emissions from tailpipe during idling of public transit buses fueled with alternative fuels

17-Sep-2012 | Kaushik Shandilya, Ashok Kumar, Environmental Progress, 2012

Abstract Engine exhaust in public transit buses has been associated with health effects. This pilot study examines the toxic nature of these engine exhausts under different idling conditions. The emission tests on public buses were performed with two different fuels: the ultra low sulfur ...

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Synthesis of an antiscuff additive to gear oils from the amylene fraction

14-Sep-2012 | Yu. V. Popov, Ya. L. Uskach, S. M. Ledenev, N. Yu. Tokmacheva, O. N. Dontsova, Russian Journal of Applied Chemistry, 2012

Interaction of the amylene fraction with sulfur monochloride was studied and the optimal conditions were determined for synthesis of a sulfur- and chlorine-containing additive to GL-4 gear oils of quality class TM-4–12, SAE 80W–85, API.

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Study of surface phenomena at phase boundaries in the presence of lignosulfonates

14-Sep-2012 | T. N. Lugovitskaya, K. N. Bolatbaev, S. S. Naboichenko, Russian Journal of Applied Chemistry, 2012

Surface activity and fundamental aspects of the wetting effect of three varieties of lignosulfonates with different compositions toward elementary sulfur and sphalerite were determined by a set of physicochemical studies.

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Kinetics of Carbon Dissolution of Coke in Molten Iron

14-Sep-2012 | Dongik Jang, Yumkyum Kim, Minsoo Shin, Joonho Lee, Metallurgical and Materials Transactions B, 2012

The effect of temperature on the dissolution rate of carbon from coke in molten iron was investigated using a sampling technique in the temperature range of 1723 K to 1923 K (1450 °C to 1650 °C). The dissolution rate of carbon from coke in molten iron increased as the temperature increased. At ...

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Impact of Algae Biofuel on In-Use Gaseous and Particulate Emissions from a Marine Vessel

14-Sep-2012 | M. Yusuf Khan; Robert L. Russell; William A. Welch; David R. Cocker, III; Sujit Ghosh, Energy & Fuels, 2012

In-use emission rates for a marine vessel operating on hydrotreated algae biofuel are reported for the first time. Emission measurements were made on a four-stroke marine diesel engine from a Stalwart class vessel to compare the emission profile from burning ultra low sulfur diesel (ULSD) to a ...

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ChemInform Abstract: Palladium‐Catalyzed Aminosulfonylation of Aryl‐, Alkenyl‐ and Heteroaryl Halides: Scope of the Three‐Component Synthesis of N‐Aminosulfonamides.

13-Sep-2012 | Edward J. Emmett, Charlotte S. Richards‐Taylor, Bao Nguyen, Alfonso Garcia‐Rubia, Barry R. Hayter, Michael C. Willis, ChemInform, 2012

Abstract For the first time the title reaction is possible by using an easy to handle and bench‐stable equivalent of sulfur dioxide, DABCO·2SO2.

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Micro‐Raman spectroscopy for the characterization of artistic patinas produced on copper‐based alloys

13-Sep-2012 | Valeria Bongiorno, Serena Campodonico, Roberta Caffara, Paolo Piccardo, Maria Maddalena Carnasciali, Journal of Raman Spectroscopy, 2012

In order to contribute to the improvement of restoration and conservation sciences of metallic artefacts belonging to Cultural Heritage, a wide research has been started on the study of artificial (artistic) and natural (corrosion or alteration) patinas of copper‐based alloys. Micro‐Raman ...

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