Full Text Journal Articles by
Author Alexey Kamyshny

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Eutrophication leads to the formation of a sulfide-rich deep-water layer in Lake Sevan, Armenia.

Khoren Avetisyan, Natella Mirzoyan, Rayford B Payne, Vardan Hayrapetyan, Alexey Kamyshny,

Lake Sevan is a meso-eutrophic water body, which was severely impacted by anthropogenic level decrease, pollution and eutrophication during the last century. Starting in the 1970s, these processes resulted in the formation of an oxygen-depleted hypolimnion during summer-autumn stratification of the lake. In this work, we demonstrate for the first ... Read more >>

Isotopes Environ Health Stud (Isotopes in environmental and health studies)
[2021, 57(5):535-552]

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Correction to: Diurnal variations in sulfur transformations at the chemocline of a stratified freshwater lake

Khoren Avetisyan, Werner Eckert, Alyssa J Findlay, Alexey Kamyshny,

In the initial online version of the article, the sampling station location “F” was missing in Fig. 1. The original article has been corrected. ... Read more >>

(Biogeochemistry.)
[2019, 146(1):101]

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Diurnal variations in sulfur transformations at the chemocline of a stratified freshwater lake

Khoren Avetisyan, Werner Eckert, Alyssa J Findlay, Alexey Kamyshny,

In order to characterize biogeochemical sulfur cycling in the metalimnion of a thermally stratified freshwater lake, we followed changes in the concentrations and isotopic composition of sulfur species during a 24-h period, during which the chemocline oscillated at an amplitude of 5.3 m due to internal wave activity. Hourly sampling ... Read more >>

(Biogeochemistry.)
[2019, 146(1):83-100]

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Kinetics of Decomposition of Thiocyanate in Natural Aquatic Systems.

Irina Kurashova, Itay Halevy, Alexey Kamyshny,

Rates of thiocyanate degradation were measured in waters and sediments of marine and limnic systems under various redox conditions, oxic, anoxic (nonsulfidic, nonferruginous, nonmanganous), ferruginous, sulfidic, and manganous, for up to 200-day period at micromolar concentrations of thiocyanate. The decomposition rates in natural aquatic systems were found to be controlled ... Read more >>

Environ Sci Technol (Environmental science & technology)
[2018, 52(3):1234-1243]

Cited: 2 times

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Turnover Rates of Intermediate Sulfur Species ([Formula: see text], S0, S2[Formula: see text], S4[Formula: see text], [Formula: see text]) in Anoxic Freshwater and Sediments.

Alyssa J Findlay, Alexey Kamyshny,

The microbial reduction of sulfate to sulfide coupled to organic matter oxidation followed by the transformation of sulfide back to sulfate drives a dynamic sulfur cycle in a variety of environments. The oxidative part of the sulfur cycle in particular is difficult to constrain because the eight electron oxidation of ... Read more >>

Front Microbiol (Frontiers in microbiology)
[2017, 8:2551]

Cited: 7 times

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Annual sulfur cycle in a warm monomictic lake with sub-millimolar sulfate concentrations.

Nadav Knossow, Barak Blonder, Werner Eckert, Alexandra V Turchyn, Gilad Antler, Alexey Kamyshny,

<h4>Background</h4>We studied the annual variability of the concentration and isotopic composition of main sulfur species and sulfide oxidation intermediates in the water column of monomictic fresh-water Lake Kinneret. Sulfate concentrations in the lake are <1 mM and similar to concentrations that are proposed to have existed in the Paleoproterozoic ocean. The ... Read more >>

Geochem Trans (Geochemical transactions)
[2015, 16:7]

Cited: 4 times

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Pathways for Neoarchean pyrite formation constrained by mass-independent sulfur isotopes.

James Farquhar, John Cliff, Aubrey L Zerkle, Alexey Kamyshny, Simon W Poulton, Mark Claire, David Adams, Brian Harms,

It is generally thought that the sulfate reduction metabolism is ancient and would have been established well before the Neoarchean. It is puzzling, therefore, that the sulfur isotope record of the Neoarchean is characterized by a signal of atmospheric mass-independent chemistry rather than a strong overprint by sulfate reducers. Here, ... Read more >>

Proc Natl Acad Sci U S A (Proceedings of the National Academy of Sciences of the United States of America)
[2013, 110(44):17638-17643]

Cited: 15 times

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Equilibrium distribution of polysulfide ions in aqueous solutions at different temperatures by rapid single phase derivatization.

Alexey Kamyshny, Jenny Gun, Dan Rizkov, Tamara Voitsekovski, Ovadia Lev,

Polysulfides are abundant form of reduced sulfur compounds whose distribution in aquatic systems continues to pose environmental challenge. The Gibbs free-energy of formation, enthalpy of formation, and standard entropy of inorganic polysulfides were derived based on measurements of the temperature-dependent distribution of inorganic polysulfides in supersaturated aqueous polysulfide solutions. The ... Read more >>

Environ Sci Technol (Environmental science & technology)
[2007, 41(7):2395-2400]

Cited: 24 times

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Method for the determination of inorganic polysulfide distribution in aquatic systems.

Alexey Kamyshny, Irina Ekeltchik, Jenny Gun, Ovadia Lev,

Inorganic polysulfides have significant technological importance, and their environmental role is gradually being unraveled. But despite their importance, there is still no method for quantification of the individual members of the polysulfide family in nonsynthetic samples. The method is based on fast, single-phase derivatization with methyl trifluoromethanesulfonate followed by one ... Read more >>

Anal Chem (Analytical chemistry)
[2006, 78(8):2631-2639]

Cited: 23 times

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Sulfur stable isotope distribution of polysulfide anions in an (NH4)2Sn aqueous solution.

Alon Amrani, Alexey Kamyshny, Ovadia Lev, Zeev Aizenshtat,

Methylation of polysulfides [(NH4)2Sn)] by reaction with CF3SO3CH3 followed by separation of the produced dimethylpolysulfides by liquid chromatography and subsequent highly accurate stable isotope analysis by a continuous-flow isotope ratio mass spectrometer shows that polysulfide anions in an aqueous solution exchange isotopes with the other sulfur species in the system. ... Read more >>

Inorg Chem (Inorganic chemistry)
[2006, 45(4):1427-1429]

Cited: 6 times

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Equilibrium distribution of polysulfide ions in aqueous solutions at 25 degrees C: a new approach for the study of polysulfides' equilibria.

Alexey Kamyshny, Anatoly Goifman, Jenny Gun, Dan Rizkov, Ovadia Lev,

A new approach based on rapid, chemical derivatization in a single phase was used to determine the disproportionation constants and the underlying thermodynamics of inorganic polysulfides in aqueous solutions. This method resolves the dispute over the existence of hexasulfide in aqueous solutions and establishes the presence of even higher polysulfide ... Read more >>

Environ Sci Technol (Environmental science & technology)
[2004, 38(24):6633-6644]

Cited: 29 times

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