Publications by authors named "John Howa"

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Forensic investigation of falsified antimalarials using isotope ratio mass spectrometry: a pilot investigation.
Paul N Newton, Lesley A Chesson, Mayfong Mayxay, Arjen Dondorp, Patricia Tabernero, John D Howa

Sci Rep· February 2024

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δ C values of urinary 19-norandrosterone in antidoping samples and potential for adverse findings from boar offal consumption.
Vinod S Nair, John D Howa, Matthew S Morrison, Lacey Beggs, Thane Campbell

Drug Test Anal· December 2023

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IRMS based evidence passes the test.
Sean Doyle, Thuan Chau, John Howa

Sci Justice· November 2023

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Detection of testosterone microdosing in healthy females.
Sasha Savkovic, Lam P Ly, Reena Desai, John Howa, Vinod Nair

Drug Test Anal· April 2022

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Distinguishing the region-of-origin of roasted coffee beans with trace element ratios.
Nicholas Q Bitter, Diego P Fernandez, Avery W Driscoll, John D Howa, James R Ehleringer

Food Chem· August 2020

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A predictive spatial model for roasted coffee using oxygen isotopes of α-cellulose.
Avery W Driscoll, John D Howa, Nicholas Q Bitter, James R Ehleringer

Rapid Commun Mass Spectrom· April 2020

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Applying the principles of isotope analysis in plant and animal ecology to forensic science in the Americas.
Lesley A Chesson, Janet E Barnette, Gabriel J Bowen, J Renée Brooks, John F Casale, John D Howa

Oecologia· August 2018

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TATP isotope ratios as influenced by worldwide acetone variation.
John D Howa, Janet E Barnette, Lesley A Chesson, Michael J Lott, James R Ehleringer

Talanta· May 2018

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Improved accuracy and precision in δ15 NAIR measurements of explosives, urea, and inorganic nitrates by elemental analyzer/isotope ratio mass spectrometry using thermal decomposition.
Michael J Lott, John D Howa, Lesley A Chesson, James R Ehleringer

Rapid Commun Mass Spectrom· August 2015

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Observations and sources of carbon and nitrogen isotope ratio variation of pentaerythritol tetranitrate (PETN).
John D Howa, Michael J Lott, James R Ehleringer

Forensic Sci Int· November 2014

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Carbon and nitrogen isotope ratios of factory-produced RDX and HMX.
John D Howa, Michael J Lott, Lesley A Chesson, James R Ehleringer

Forensic Sci Int· July 2014

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Isolation and stable nitrogen isotope analysis of ammonium ions in ammonium nitrate prills using sodium tetraphenylborate.
John D Howa, Michael J Lott, James R Ehleringer

Rapid Commun Mass Spectrom· July 2014

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Hydrogen and oxygen isotope values in hydrogen peroxide.
Janet E Barnette, Michael J Lott, John D Howa, David W Podlesak, James R Ehleringer

Rapid Commun Mass Spectrom· May 2011

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