John Helms
John Helms
Associate Professor of Chemistry, Morningside College
כתובת אימייל מאומתת בדומיין morningside.edu - דף הבית
כותרת
צוטט על ידי
צוטט על ידי
שנה
Absorption spectral slopes and slope ratios as indicators of molecular weight, source, and photobleaching of chromophoric dissolved organic matter
JR Helms, A Stubbins, JD Ritchie, EC Minor, DJ Kieber, K Mopper
Limnology and Oceanography 53 (3), 955-969, 2008
18032008
Photochemical bleaching of oceanic dissolved organic matter and its effect on absorption spectral slope and fluorescence
JR Helms, A Stubbins, EM Perdue, NW Green, H Chen, K Mopper
Marine Chemistry 155, 81-91, 2013
2062013
Loss of optical and molecular indicators of terrigenous dissolved organic matter during long-term photobleaching
JR Helms, J Mao, A Stubbins, K Schmidt-Rohr, RGM Spencer, PJ Hernes, ...
Aquatic Sciences 76 (3), 353-373, 2014
922014
Photochemical flocculation of terrestrial dissolved organic matter and iron
JR Helms, J Mao, K Schmidt-Rohr, H Abdulla, K Mopper
Geochimica et Cosmochimica Acta 121, 398-413, 2013
772013
Ultrahigh resolution mass spectrometric differentiation of dissolved organic matter isolated by coupled reverse osmosis-electrodialysis from various major oceanic water masses
H Chen, A Stubbins, EM Perdue, NW Green, JR Helms, K Mopper, ...
Marine Chemistry 164, 48-59, 2014
492014
Structural characterization of gilsonite bitumen by advanced nuclear magnetic resonance spectroscopy and ultrahigh resolution mass spectrometry revealing pyrrolic and aromatic …
JR Helms, X Kong, E Salmon, PG Hatcher, K Schmidt-Rohr, J Mao
Organic geochemistry 44, 21-36, 2012
322012
Photochemical dissolution of organic matter from resuspended sediments: Impact of source and diagenetic state on photorelease
JR Helms, DA Glinski, RN Mead, MW Southwell, G Brooks Avery, ...
Organic Geochemistry 73, 83-89, 2014
242014
Spectroscopic characterization of oceanic dissolved organic matter isolated by reverse osmosis coupled with electrodialysis
JR Helms, J Mao, H Chen, EM Perdue, NW Green, PG Hatcher, K Mopper, ...
Marine Chemistry 177, 278-287, 2015
172015
Surface waters as a sink and source of atmospheric gas phase ethanol
GB Avery Jr, L Foley, AL Carroll, JA Roebuck Jr, A Guy, RN Mead, ...
Chemosphere 144, 360-365, 2016
152016
Erratum: Absorption spectral slopes and slope ratios as indicators of molecular weight, source, and photobleaching of chromophoric dissolved organic matter
JR Helms, A Stubbins, JD Ritchie, EC Minor, DJ Kieber, K Mopper
Limnol. Oceanogr 54 (3), 1023, 2009
152009
Removal of atmospheric ethanol by wet deposition
JD Felix, JD Willey, RK Thomas, KM Mullaugh, GB Avery, RJ Kieber, ...
Global Biogeochemical Cycles 31 (2), 348-356, 2017
142017
Spectroscopic Characterization of Dissolved Organic Matter: Insights Into Composition, Photochemical Transformation, and Carbon Cycling
JR Helms
Old Dominion University, 2012
122012
Photodegradation of the antihistamine cetirizine in natural waters
RN Mead, S Barefoot, JR Helms, JB Morgan, RJ Kieber
Environmental toxicology and chemistry 33 (10), 2240-2245, 2014
102014
A Major Step in Opening the Black Box of High-Molecular-Weight Dissolved Organic Nitrogen by Isotopic Labeling of Synechococcus and Multibond Two …
X Cao, MR Mulholland, JR Helms, PW Bernhardt, P Duan, J Mao, ...
Analytical chemistry 89 (22), 11990-11998, 2017
92017
Biogeochemical alteration of dissolved organic material in the Cape Fear River Estuary as a function of freshwater discharge
JL Dixon, JR Helms, RJ Kieber, GB Avery Jr.
Estuarine, Coastal and Shelf Science 149, 273-282, 2014
72014
Effect of pH and ionic strength on terrestrial DOM photoreactivity: Implications in estuarine DOM transformations
K Mopper, J Helms, A Stubbins, N Chen, E Minor, B Dalzell
EOS, Transactions, American Geophysical Union 87 (36), 2006
62006
Enhanced detection of the algal toxin PbTx‐2 in marine waters by atmospheric pressure chemical ionization mass spectrometry
RN Mead, EE Probst, JR Helms, GB Avery, RJ Kieber, SA Skrabal
Rapid Communications in Mass Spectrometry 28 (22), 2455-2460, 2014
52014
Spectral shape as an indicator of molecular weight in chromophoric dissolved organic matter
JR Helms
Old Dominion University, 2006
42006
DOC photodegradation and the enhancement of microbial respiration in estuarine and coastal waters
AP Stubbins, J Helms, K Mopper, DJ Kieber, EM White
Abstracts of Papers of the American Chemical Society 225, U804-U804, 2003
22003
Composition and lability of photochemically released dissolved organic matter from resuspended estuarine sediments
JL Harfmann, GB Avery Jr, HD Rainey, RN Mead, SA Skrabal, RJ Kieber, ...
Organic Geochemistry 151, 104164, 2021
12021
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