A5071639979- Toxic Organic Pollutants Impact
- Microbial bioremediation and biosurfactants
- Isotope Analysis in Ecology
- Environmental remediation with nanomaterials
- Water Treatment and Disinfection
- Groundwater and Isotope Geochemistry
- Radioactive element chemistry and processing
- Asymmetric Hydrogenation and Catalysis
- Chemical Reactions and Isotopes
- Pharmaceutical and Antibiotic Environmental Impacts
- Analytical chemistry methods development
- Atmospheric and Environmental Gas Dynamics
- Chemical Synthesis and Reactions
- Chemical Analysis and Environmental Impact
- Mass Spectrometry Techniques and Applications
- Mercury impact and mitigation studies
- Analytical Chemistry and Chromatography
- Advanced Chemical Physics Studies
- Organometallic Complex Synthesis and Catalysis
- Microplastics and Plastic Pollution
- Hydrocarbon exploration and reservoir analysis
- Atmospheric chemistry and aerosols
- Catalytic Processes in Materials Science
- Microbial Community Ecology and Physiology
- Methane Hydrates and Related Phenomena
Geological Survey of Israel
2015-2024
Albert Einstein College of Medicine
2017
University of California, Los Angeles
2011
Hebrew University of Jerusalem
1998-2007
Massachusetts Institute of Technology
2004
Anaerobic oxidation of methane (AOM) by sulfate has been recognized as a critical process to maintain this greenhouse gas stability limiting flux the atmosphere. We show geochemical evidence for AOM in deep lake sediments and demonstrate that is likely driven iron (Fe) reduction. Pore‐water profiles from Lake Kinneret (Sea Galilee, Israel) sink located below 20‐cm depth sediment, which well depths at nitrate are completely exhausted, zone methanogenesis. Iron‐dependant was verified...
Here is a solution to classical problem: How put, in one pot, both an acid and base without their mutual destruction? The sol–gel materials method offers approach: acids or bases are entrapped within these materials, then organic reaction sequences, which require opposing reagents, carried out simultaneously consecutively the same pot (see scheme).
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOne-Pot Reactions with Opposing Reagents: Sol−Gel Entrapped Catalyst and BaseFaina Gelman, Jochanan Blum, David AvnirView Author Information Institute of Chemistry, The Hebrew University Jerusalem 91904, Israel Cite this: J. Am. Chem. Soc. 2000, 122, 48, 11999–12000Publication Date (Web):November 15, 2000Publication History Received15 August 2000Published online15 November inissue 1 December...
We extend our sol-gel methodology of one-pot sequences reactions with opposing reagents to an enzyme/metal-complex pair. Sol-gel entrapped lipase and RhCl[P(C(6)H(5))(3)](3) or Rh(2)Co(2)(CO)(12) were used for esterification C-C double bond hydrogenation reactions, leading saturated esters in good yields. When only the enzyme is entrapped, homogeneous catalysts quench its activity poison it. Thus, when 10-undecenoic acid 1-pentanol subjected one pot homogeneously dissolved under hydrogen...
Dental caries (tooth decay) is caused by a specific group of cariogenic bacteria, like Streptococcus mutans, which convert dietary sugars into acids that dissolve the mineral in tooth structure. Killing bacteria an effective way to control or prevent decay. In previous study, we discovered novel compound (Glycyrrhizol A), from extraction licorice roots, with strong antimicrobial activity against bacteria. current developed method produce these herbal extracts large quantities, and then used...
In the present study, carbon and bromine isotope effects during UV-photodegradation of bromophenols in aqueous ethanolic solutions were determined. An anomalous relatively high inverse fractionation (εreactive position up to +5.1‰) along with normal effect -12.6‰ -23.4‰) observed our study may be attributed coexistence both mass-dependent mass-independent C-Br bond cleavage. Isotope a similar scale for all studied reactions ethanol, 4-bromophenol solution. This point out related radical...
We developed an analytical method for precise and accurate analysis of δ(34)S, δ(81)Br, δ(37)Cl in individual anionic species by coupled ion chromatography (IC) multicollector inductively plasma mass spectrometry (MC-ICPMS). The is based on the online separation purification ions IC prior to their isotope MC-ICPMS. technique significantly simplifies environmental samples. In cases when several same element are present sample, they might be analyzed a single run. Major isobaric interferences...
The present study investigated dual carbon–bromine isotope fractionation of the common groundwater contaminant ethylene dibromide (EDB) during chemical and biological transformations, including aerobic anaerobic biodegradation, alkaline hydrolysis, Fenton-like degradation, debromination by Zn(0) reduced corrinoids. Significantly different correlation carbon bromine (ΛC/Br) was observed not only for processes following transformation pathways, but also abiotic biotic with, presumed, same...
The Rayleigh equation is frequently used to describe isotope fractionation as a function of conversion. In this article we propose draw parallel between and enantiomeric enrichments derive set conditions that allow the use approach enrichment-conversion dependencies. We demonstrate an implementation for enantioselective enzymatic hydrolysis Mecoprop-methyl, Dichlorprop-methyl, dimethyl-methylsuccinate by lipases from Pseudomonas fluorescens, cepacia, Candida rugosa. data obtained all studied...
An oxidant and a reducing catalyst are placed in single pot without destroying each other, but still capable of carrying out useful reactions, simultaneously. The oxidant, pyridinium dichromate, an H2-reduction catalyst, RhCl[P(C6H5)3]3, were entrapped separate sol-gel matrices, with these reagent three different flow-chart sequences one-pot redox reactions carried out—up to four one pot—without their mutual destruction no need for separation steps.
They do exist! Free carbyne radicals can be prepared at room temperature in an aqueous solution by the decomposition of mono- or trinuclear metal (M) complexes containing alkylidyne ligands (see scheme; red C, blue M, green H). The generated then react to form a variety organic compounds chain-lengthening reactions solution. also exhibit hydrogen, oxygen, carbon abstraction from solvent, reactant, product molecules.
Many of polybrominated organic compounds, used as flame retardant additives, belong to the group persistent pollutants. Compound-specific isotope analysis is one potential analytical tools for investigating their fate in environment. However, effects associated with transformations brominated compounds are still poorly explored. In present study, we investigated carbon and bromine fractionation during degradation tribromoneopentyl alcohol (TBNPA), widely three different chemical processes:...
A crude oil spill in 2014 resulted extensive soil contamination of the hyper arid Evrona Nature Reserve Israel’s Negev Desert. The contaminated soils became highly hydrophobic, threatening existence plants habitat. We hypothesized that bioaugmenting with indigenous biosurfactant-producing, hydrocarbon-degrading bacteria (HDB) would accelerate reduction soil’s hydrophobicity. aimed to isolate and characterize biosurfactant-producing HDBs from desert-contaminated test if they can be used for...
Keine Neutralisation: Wie kann ein Reaktionsgefäß gleichzeitig eine Säure und Base enthalten, ohne dass sich diese neutralisieren? Eine Methode, die auf Sol/Gel-Materialien beruht, bietet einen Lösungsansatz für dieses Problem: Säuren Basen werden in diesen Materialien immobilisiert, organische Reaktionssequenzen, beide Arten von Reagens benötigen, können dann als Eintopfprozesse ablaufen (siehe Schema).
Compound-specific isotope analysis of sulfur (δ34S-CSIA) in organic compounds was established the last decade employing gas chromatography connected to multiple-collector inductively coupled plasma mass spectrometry (GC-MC-ICPMS). However, δ33S-CSIA has not yet been reported so far. In this study, we present a method for simultaneous determination δ33S and δ34S by GC-MC-ICPMS applying medium- also low-mass-resolution modes. The validated using international reference materials IAEA-S-1,...
In this study, we examine the possibility of detecting PTFE microparticles by ICP-qMS equipped with O 2 dynamic reaction cell (DRC) and operated in single-particle mode.