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Experimental pKa determination for perfluorooctanoic acid (PFOA) and the potential impact of pKa concentration dependence on laboratory-measured partitioning phenomena and environmental modeling.
An accurately measured equilibrium acid dissociation constant (pKa) is essential for understanding and predicting the fate of perfluorocarboxylic acids (PFCAs) in the environment. The aqueous pKa ofExpand
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A water-soluble azobenzene cross-linker for photocontrol of peptide conformation.
We have designed and synthesized a water-soluble, sulfonated version of an azobenzene-based thiol-reactive cross-linker that can be introduced into peptides and proteins and act as a conformationalExpand
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Structural and optical characterization of dissolved organic matter from the lower Athabasca River, Canada.
Dissolved organic matter (DOM) is a ubiquitous constituent of natural waters and is comprised of a variety of chemically heterogeneous molecular structures and functional groups. DOM is oftenExpand
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A predictive tool for assessing 13C NMR chemical shifts of flavonoids
Herein are presented the 1H and 13C NMR data for seven monohydroxyflavones (3‐, 5‐, 6‐, 7‐, 2′‐, 3′‐, and 4′‐hydroxyflavone), five dihydroxyflavones (3,2′‐, 3,3′‐, 3,4′‐, 3,6‐,Expand
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Assignment of 1H and 13C spectra and investigation of hindered side‐chain rotation in lupeol derivatives †
Complete 1H and 13C spectral assignments are reported for lupeol (1a) and two derivatives where the C‐30 methyl group is replaced by CH2OH (1b) and HC O (1c). Compound 1c shows conformationallyExpand
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Stereochemical inversion of (S)-reticuline by a cytochrome P450 fusion in opium poppy.
The gateway to morphine biosynthesis in opium poppy (Papaver somniferum) is the stereochemical inversion of (S)-reticuline since the enzyme yielding the first committed intermediate salutaridine isExpand
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Synthesis of 3,3′-bis(sulfonato)-4,4′-bis(chloroacetamido)azobenzene and cysteine cross-linking for photo-control of protein conformation and activity
This protocol describes a procedure for the synthesis of 3,3′-bis(sulfonato)-4,4′-bis(chloroacetamido)azobenzene (BSBCA), a water-soluble, thiol-reactive, photo-switchable cross-linker. In addition,Expand
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The toxicity of titanium dioxide nanopowder to early life stages of the Japanese medaka (Oryzias latipes).
In this study, fertilized Japanese medaka (Oryzias latipes) embryos were exposed from fertilization to 5 d post-hatch using static non-renewal assays to aqueous suspensions of titanium dioxideExpand
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CRAPT: an improved version of APT with compensation for variations in JCH
A modified version of the attached proton test (APT) sequence for 13C spectral editing, which we call CRisis‐APT (CRAPT), is developed and tested on representative organic compounds. CRAPTExpand
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