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Physical Sciences and Mathematics Commons™
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Articles 1 - 3 of 3
Full-Text Articles in Physical Sciences and Mathematics
Organocatalysis With Endogenous Compounds: Towards Novel Non-Enzymatic Reactions, David G. Alberg, Thomas B. Poulsen, Søren Bertelsen, Kasper L. Christensen, Rune D. Birkler, Mogens Johannsen, Karl Anker Jørgensen
Organocatalysis With Endogenous Compounds: Towards Novel Non-Enzymatic Reactions, David G. Alberg, Thomas B. Poulsen, Søren Bertelsen, Kasper L. Christensen, Rune D. Birkler, Mogens Johannsen, Karl Anker Jørgensen
Faculty Work
The aldol reaction of the endogeneous compounds acetone and methylglyoxal has been studied using organocatalysis in relation to biologically relevant non-enzymatic reactions. Under preparative conditions, 3-hydroxy-2,5-hexadione, known as Henze’s ketol, is formed in high yield and with enantioselectivities up to 88% ee. Furthermore, Henze’s ketol is also formed under simulated physiological conditions at micromolar scale, indicating that this reaction might take place in living organisms.
Estimating The Contribution Of Point Sources To Atmospheric Metals Using Single-Particle Mass Spectrometry, David C. Snyder, James J. Schauer, Deborah S. Gross, Jay R. Turner
Estimating The Contribution Of Point Sources To Atmospheric Metals Using Single-Particle Mass Spectrometry, David C. Snyder, James J. Schauer, Deborah S. Gross, Jay R. Turner
Faculty Work
Single-particle mass spectra were collected using an Aerosol Time-of-Flight Mass Spectrometer (ATOFMS) during December of 2003 and February of 2004 at an industrially impacted location in East St. Louis, IL. Hourly integrated peak areas for twenty ions were evaluated for their suitability in representing metals/metalloids, particularly those reported in the US EPA Toxic Release Inventory (TRI). Of the initial twenty ions examined, six (Al, As, Cu, Hg, Ti, and V) were found to be unsuitable due to strong isobaric interferences with commonly observed organic fragments, and one (Be) was found to have no significant signal. The usability of three ions …
Subarctic Atmospheric Aerosol Composition: 2. Hygroscopic Growth Properties, Hanna Herich, Lukas Kammermann, Beth Friedman, Deborah S. Gross, Ernest Weingartner, Ulrike Lohmann, Peter Spichtinger, Martin Gysel, Urs Baltensperger, Daniel J. Cziczo
Subarctic Atmospheric Aerosol Composition: 2. Hygroscopic Growth Properties, Hanna Herich, Lukas Kammermann, Beth Friedman, Deborah S. Gross, Ernest Weingartner, Ulrike Lohmann, Peter Spichtinger, Martin Gysel, Urs Baltensperger, Daniel J. Cziczo
Faculty Work
Subarctic aerosols were sampled during July 2007 at the Abisko Scientific Research Station Stordalen site in northern Sweden with an instrument setup consisting of a custombuilt Hygroscopicity Tandem Differential Mobility Analyzer (HTDMA) connected in series to a single particle mass spectrometer. Aerosol chemical composition in the form of bipolar single particle mass spectra was determined as a function of hygroscopic growth both in situ and in real time. The HTDMA was deployed at a relative humidity of 82%, and particles with a dry mobility diameter of 260 nm were selected. Aerosols from two distinct air masses were analyzed during the …