Publication year: 2009 Source: Marine Chemistry, In Press, Accepted Manuscript, Available online 30 October 2009 Raphael, Pietzsch , Sambasiva R., Patchineelam , João P.M., Torres
The scope of this work was to evaluate the levels of polycyclic aromatic hydrocarbons (PAHs) and their possible sources in two shallow sediment cores from an estuarine area located in the south region of Brazil, the Guaratuba Bay. The estuary is encompassed by an Environmental Protection Area (EPA) of 1,306km2, which is still considered to be pristine, despite recent urban growth. To assess levels of 14 selected PAHs in the sediments, among those listed as “priority pollutants” by the US Environmental Protection Agency, the cores were divided in several sections, followed by extraction, clean-up, fractionation and subsequent analysis using [...]
Publication year: 2009 Source: Marine Chemistry, In Press, Accepted Manuscript, Available online 30 October 2009 Piotr, Kowalczuk , William J., Cooper , Michael J., Durako , Amanda E., Kahn , Michael, Gonsior , …
In this study, the CDOM absorption coefficient at 350nm [aCDOM(350)] and CDOM excitation emission matrix (EEM) fluorescence were used to estimate annual fluxes of dissolved organic carbon (DOC) from the Cape Fear River to Long Bay in the South Atlantic Bight. Water samples were collected during a 3.5year period, from October 2001 through March 2005, in the vicinity of the Cape Fear River (CFR) outlet and adjacent Onslow Bay (OB). Parallel factor analysis (PARAFAC) of CDOM EEM spectra identified six components: three terrestrial humic-like, one marine humic-like and two protein-like. Empirical relationships were derived from the PARAFAC model between [...]
Publication year: 2009 Source: Marine Chemistry, In Press, Accepted Manuscript, Available online 27 October 2009 Frauke, Schmidt , Kai-Uwe, Hinrichs , Marcus, Elvert
Continental shelves play a major role as transition zone during transport of multiply-sourced organic matter into the deep sea. In order to obtain a comprehensive understanding of the origin and fractionation processes of organic matter at the NW Iberian margin, 40 surface sediment samples were analyzed for a structurally diverse range of lipid biomarkers, lignin phenols, grain size distribution, organic carbon content (TOC), its stable carbon isotopic composition (δ13CTOC), and the organic carbon to nitrogen ratio (TOC/TN). The biomarker inventory reflected a heterogeneous mixture of organic matter from various marine and terrestrial sources. Soil- and vascular plant-derived continental organic [...]
Publication year: 2009 Source: Marine Chemistry, In Press, Accepted Manuscript, Available online 14 October 2009 Emily M., White , David J., Kieber , Jane, Sherrard , William L., Miller , Kenneth, Mopper
Photochemical mineralization of dissolved organic matter (DOM) plays an important role in the cycling of carbon in estuarine systems. A key to modeling this process is knowledge of apparent quantum yields (AQYs) for the photochemical products. Here we determined spectral AQYs for carbon dioxide (CO2) and carbon monoxide (CO), the main products of DOM photomineralization, along the main axis of the Delaware Estuary. Apparent quantum yields for CO2 photoproduction were determined shipboard using a multi-spectral irradiation system. Carbon monoxide AQYs were determined in stored samples by employing a narrow band spectral irradiation system. A single apparent quantum yield (AQY) [...]
In the late 1990s Catellani reported a remarkable palladium-catalyzed domino reaction [1] in the presence of norbornene, in
which aryl iodides were alkylated at the ortho positions by alkyl halides followed by a Mizoroki-Heck reaction to afford products of type 1 (Scheme 1) [2–4]. The process allowed for the construction of up to three carbon–carbon bonds in a single reaction using
simple, commercially available starting materials. We called this process the Catellani reaction, and in the past decade considerable
attention has been focused upon unlocking its synthetic potential. This review will primarily focus upon the mechanistic aspects
of the Catellani reaction, followed by an overview of the synthetic scope of molecules currently accessible with this technology.
Content Type Book Chapter
DOI 10.1007/128_2009_13
Authors
Andrew Martins, University of Toronto Department of Chemistry Toronto ON Canada
Brian Mariampillai, University of Toronto Department of Chemistry Toronto ON Canada
Mark Lautens, University of Toronto Department of Chemistry Toronto ON Canada
Abstract We review the statistical properties of the main populations of radio sources, as emerging from radio and millimeter sky surveys.
Recent determinations of local luminosity functions are presented and compared with earlier [...]
Stoichiometric cycloruthenation reactions of substrates containing Lewis-basic functionalities set the stage for efficient
ruthenium-catalyzed C–H bond functionalization reactions. Thereby, selective addition reactions of C–H bonds across alkenes
or alkynes enabled atom-economical synthesis of substituted arenes. More recently, ruthenium-catalyzed direct arylation reactions
were examined, which display an unparalleled scope and, hence, represent economically and environmentally benign alternatives
to traditional cross-coupling chemistry.
Content Type Book Chapter
DOI 10.1007/128_2009_9
Authors
Lutz Ackermann, Georg-August-Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammanstrasse 2 37077 Göttingen Germany
Rubén Vicente, Georg-August-Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammanstrasse 2 37077 Göttingen Germany
