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John Helms
John Helms
Other namesJohn Robert Helms
Dean of Work Learning, Sterling College
Verified email at sterlingcollege.edu
Title
Cited by
Cited by
Year
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
27112008
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
3052013
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, 353-373, 2014
1362014
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
1002013
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
702014
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
522012
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
Limnology and oceanography, 1023-1023, 2009
362009
Photochemical dissolution of organic matter from resuspended sediments: Impact of source and diagenetic state on photorelease
JR Helms, DA Glinski, RN Mead, MW Southwell, GB Avery, RJ Kieber, ...
Organic geochemistry 73, 83-89, 2014
302014
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
292015
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
202017
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
192017
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
172016
Spectroscopic characterization of dissolved organic matter: insights into composition, photochemical transformation and carbon cycling
JR Helms
Old Dominion University, 2012
162012
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
152021
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
132014
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
82014
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
72006
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
Morningside College
JR Helms
United States, 0
5
Spectral shape as an indicator of molecular weight in chromophoric dissolved organic matter
JR Helms
Old Dominion University, 2006
42006
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