1
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Meidan D, Brown SS, Sinha V, Rudich Y. Nocturnal Atmospheric Oxidative Processes in the Indo-Gangetic Plain and Their Variation During the COVID-19 Lockdowns. Geophys Res Lett 2022; 49:e2021GL097472. [PMID: 35601504 PMCID: PMC9111199 DOI: 10.1029/2021gl097472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 03/24/2022] [Accepted: 03/28/2022] [Indexed: 06/15/2023]
Abstract
This study investigates selected secondary atmospheric responses to the widely reported emission change attributed to COVID-19 lockdowns in the highly polluted Indo-Gangetic Plain (IGP) using ground-based measurements of trace gases and particulate matter. We used a chemical box-model to show that production of nighttime oxidant, NO3, was affected mainly by emission decrease (average nighttime production rates 1.2, 0.8 and 1.5 ppbv hr-1 before, during and relaxation of lockdown restrictions, respectively), while NO3 sinks were sensitive to both emission reduction and seasonal variations. We have also shown that the maximum potential mixing ratio of nitryl chloride, a photolytic chlorine radical source which has not been previously considered in the IGP, is as high as 5.5 ppbv at this inland site, resulting from strong nitrate radical production and a potentially large particulate chloride mass. This analysis suggests that air quality measurement campaigns and modeling explicitly consider heterogeneous nitrogen oxide and halogen chemistry.
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Affiliation(s)
- D. Meidan
- Department of Earth and Planetary SciencesWeizmann Institute of ScienceRehovotIsrael
| | - S. S. Brown
- NOAA Chemical Sciences LaboratoryBoulderCOUSA
- Department of ChemistryUniversity of ColoradoBoulderCOUSA
| | - V. Sinha
- Department of Earth and Environmental SciencesIndian Institute of Science Education and Research MohaliMohaliIndia
| | - Y. Rudich
- Department of Earth and Planetary SciencesWeizmann Institute of ScienceRehovotIsrael
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2
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Vereecken L, Carlsson PTM, Novelli A, Bernard F, Brown SS, Cho C, Crowley JN, Fuchs H, Mellouki W, Reimer D, Shenolikar J, Tillmann R, Zhou L, Kiendler-Scharr A, Wahner A. Theoretical and experimental study of peroxy and alkoxy radicals in the NO3-initiated oxidation of isoprene. Phys Chem Chem Phys 2021; 23:5496-5515. [DOI: 10.1039/d0cp06267g] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Under atmospheric conditions, nitrate-RO2 radicals are equilibrated and react predominantly with HO2, RO2 and NO. The nitrate-RO chemistry is affected strongly by ring closure to epoxy radicals, impeding formation of MVK/MACR.
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Affiliation(s)
- L. Vereecken
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - P. T. M. Carlsson
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - A. Novelli
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - F. Bernard
- Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique
- 45071 Orléans CEDEX 2
- France
| | - S. S. Brown
- NOAA Chemical Sciences Laboratory
- Boulder
- USA
- Department of Chemistry, University of Colorado Boulder
- Boulder
| | - C. Cho
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - J. N. Crowley
- Atmospheric Chemistry Department, Max-Planck-Institut für Chemie
- 55128 Mainz
- Germany
| | - H. Fuchs
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - W. Mellouki
- Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique
- 45071 Orléans CEDEX 2
- France
| | - D. Reimer
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - J. Shenolikar
- Atmospheric Chemistry Department, Max-Planck-Institut für Chemie
- 55128 Mainz
- Germany
| | - R. Tillmann
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - L. Zhou
- Institut de Combustion, Aérothermique, Réactivité et Environnement (ICARE), CNRS (UPR 3021)/OSUC, 1C Avenue de la Recherche Scientifique
- 45071 Orléans CEDEX 2
- France
| | - A. Kiendler-Scharr
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
| | - A. Wahner
- Institute for Energy and Climate Research, Forschungszentrum Jülich GmbH
- 52428 Jülich
- Germany
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3
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Haskins JD, Lopez-Hilfiker FD, Lee BH, Shah V, Wolfe GM, DiGangi J, Fibiger D, McDuffie EE, Veres P, Schroder JC, Campuzano-Jost P, Day DA, Jimenez JL, Weinheimer A, Sparks T, Cohen RC, Campos T, Sullivan A, Guo H, Weber R, Dibb J, Greene J, Fiddler M, Bililign S, Jaeglé L, Brown SS, Thornton JA. Anthropogenic control over wintertime oxidation of atmospheric pollutants. Geophys Res Lett 2019; 46:14826-14835. [PMID: 33012881 PMCID: PMC7526063 DOI: 10.1029/2019gl085498] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Accepted: 12/11/2019] [Indexed: 05/31/2023]
Abstract
During winter in the mid-latitudes, photochemical oxidation is significantly slower than in summer and the main radical oxidants driving formation of secondary pollutants, such as fine particulate matter and ozone, remain uncertain, owing to a lack of observations in this season. Using airborne observations, we quantify the contribution of various oxidants on a regional basis during winter, enabling improved chemical descriptions of wintertime air pollution transformations. We show that 25-60% of NOx is converted to N2O5 via multiphase reactions between gas-phase nitrogen oxide reservoirs and aerosol particles, with ~93% reacting in the marine boundary layer to form >2.5 ppbv ClNO2. This results in >70% of the oxidizing capacity of polluted air during winter being controlled, not by typical photochemical reactions, but from these multiphase reactions and emissions of volatile organic compounds, such as HCHO, highlighting the control local anthropogenic emissions have on the oxidizing capacity of the polluted wintertime atmosphere.
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Affiliation(s)
- J. D. Haskins
- Department of Atmospheric Sciences, University of Washington, Seattle, WA USA
| | | | - B. H. Lee
- Department of Atmospheric Sciences, University of Washington, Seattle, WA USA
| | - V. Shah
- Department of Atmospheric Sciences, University of Washington, Seattle, WA USA
| | - G. M. Wolfe
- Joint Center for Earth Systems Technology, University of Maryland Baltimore County, Baltimore, MD USA
- Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD USA
| | - J. DiGangi
- NASA Langley Research Center, Hampton, VA USA
| | - D. Fibiger
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO USA
| | - E. E. McDuffie
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry, University of Colorado, Boulder, CO USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO USA
| | - P. Veres
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
| | - J. C. Schroder
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry, University of Colorado, Boulder, CO USA
| | - P. Campuzano-Jost
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry, University of Colorado, Boulder, CO USA
| | - D. A. Day
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry, University of Colorado, Boulder, CO USA
| | - J. L. Jimenez
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry, University of Colorado, Boulder, CO USA
| | - A. Weinheimer
- Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO USA
| | - T. Sparks
- Department of Chemistry, University of California, Berkeley CA USA
| | - R. C. Cohen
- Department of Chemistry, University of California, Berkeley CA USA
| | - T. Campos
- Earth Observing Laboratory, National Center for Atmospheric Research, Boulder, CO USA
| | - A. Sullivan
- Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO USA
| | - H. Guo
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA USA
| | - R. Weber
- School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA USA
| | - J. Dibb
- Department of Earth Sciences, University of New Hampshire, Durham, NH USA
| | - J. Greene
- Department of Physics, North Carolina A&T State University, Greensboro, NC USA
| | - M. Fiddler
- Department of Physics, North Carolina A&T State University, Greensboro, NC USA
| | - S. Bililign
- Department of Physics, North Carolina A&T State University, Greensboro, NC USA
| | - L. Jaeglé
- Department of Atmospheric Sciences, University of Washington, Seattle, WA USA
| | - S. S. Brown
- Department of Chemistry, University of Colorado, Boulder, CO USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO USA
| | - J. A. Thornton
- Department of Atmospheric Sciences, University of Washington, Seattle, WA USA
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4
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Liu S, Li R, Wild RJ, Warneke C, de Gouw JA, Brown SS, Miller SL, Luongo JC, Jimenez JL, Ziemann PJ. Contribution of human-related sources to indoor volatile organic compounds in a university classroom. Indoor Air 2016; 26:925-938. [PMID: 26610063 DOI: 10.1111/ina.12272] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 11/18/2015] [Indexed: 05/03/2023]
Abstract
Although significant progress has been made in understanding the sources and chemistry of indoor volatile organic compounds (VOCs) during the past decades, much is unknown about the role of humans in indoor air chemistry. In the spring of 2014, we conducted continuous measurements of VOCs using a proton transfer reaction mass spectrometer (PTR-MS) in a university classroom. Positive matrix factorization (PMF) of the measured VOCs revealed a 'human influence' component, which likely represented VOCs produced from human breath and ozonolysis of human skin lipids. The concentration of the human influence component increased with the number of occupants and decreased with ventilation rate in a similar way to CO2 , with an average contribution of 40% to the measured daytime VOC concentration. In addition, the human skin lipid ozonolysis products were observed to correlate with CO2 and anticorrelate with O3 , suggesting that reactions on human surfaces may be important sources of indoor VOCs and sinks for indoor O3 . Our study suggests that humans can substantially affect VOC composition and oxidative capacity in indoor environments.
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Affiliation(s)
- S Liu
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA
| | - R Li
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Atmospheric and Oceanic Sciences, University of Colorado, Boulder, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - R J Wild
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - C Warneke
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - J A de Gouw
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - S S Brown
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO, USA
| | - S L Miller
- Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA
| | - J C Luongo
- Department of Mechanical Engineering, University of Colorado, Boulder, CO, USA
| | - J L Jimenez
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA
| | - P J Ziemann
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, USA
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO, USA
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5
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Affiliation(s)
- S. S. Brown
- Division of Clinical Chemistry M.R.C. Clinical Research Centre, Harrow, Middlesex
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6
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Affiliation(s)
- S. S. Brown
- University Department of Clinical Chemistry, Royal Infirmary, Edinburgh, EH3 9YW
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7
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Affiliation(s)
- B. W. Meade
- (Chairman) Kingston and Long Grove Group Hospitals, Kingston upon Thames, Surrey
| | | | - B. Widdop
- (Secretary) New Cross Hospital, London, SE14 5ER
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8
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Affiliation(s)
- S. S. Brown
- University Department of Clinical Chemistry, Royal Infirmary, Edinburgh
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9
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Affiliation(s)
- A. A. H. Lawson
- Poisoning Treatment Centre and University Department of Clinical Chemistry, Royal Infirmary, Edinburgh
| | - S. S. Brown
- Poisoning Treatment Centre and University Department of Clinical Chemistry, Royal Infirmary, Edinburgh
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10
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Warneke C, Trainer M, de Gouw JA, Parrish DD, Fahey DW, Ravishankara AR, Middlebrook AM, Brock CA, Roberts JM, Brown SS, Neuman JA, Lerner BM, Lack D, Law D, Hübler G, Pollack I, Sjostedt S, Ryerson TB, Gilman JB, Liao J, Holloway J, Peischl J, Nowak JB, Aikin K, Min KE, Washenfelder RA, Graus MG, Richardson M, Markovic MZ, Wagner NL, Welti A, Veres PR, Edwards P, Schwarz JP, Gordon T, Dube WP, McKeen S, Brioude J, Ahmadov R, Bougiatioti A, Lin JJ, Nenes A, Wolfe GM, Hanisco TF, Lee BH, Lopez-Hilfiker FD, Thornton JA, Keutsch FN, Kaiser J, Mao J, Hatch C. Instrumentation and Measurement Strategy for the NOAA SENEX Aircraft Campaign as Part of the Southeast Atmosphere Study 2013. Atmos Meas Tech 2016. [PMID: 29619117 DOI: 10.5194/amt-2015-388] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
Natural emissions of ozone-and-aerosol-precursor gases such as isoprene and monoterpenes are high in the southeast of the US. In addition, anthropogenic emissions are significant in the Southeast US and summertime photochemistry is rapid. The NOAA-led SENEX (Southeast Nexus) aircraft campaign was one of the major components of the Southeast Atmosphere Study (SAS) and was focused on studying the interactions between biogenic and anthropogenic emissions to form secondary pollutants. During SENEX, the NOAA WP-3D aircraft conducted 20 research flights between 27 May and 10 July 2013 based out of Smyrna, TN. Here we describe the experimental approach, the science goals and early results of the NOAA SENEX campaign. The aircraft, its capabilities and standard measurements are described. The instrument payload is summarized including detection limits, accuracy, precision and time resolutions for all gas-and-aerosol phase instruments. The inter-comparisons of compounds measured with multiple instruments on the NOAA WP-3D are presented and were all within the stated uncertainties, except two of the three NO2 measurements. The SENEX flights included day- and nighttime flights in the Southeast as well as flights over areas with intense shale gas extraction (Marcellus, Fayetteville and Haynesville shale). We present one example flight on 16 June 2013, which was a daytime flight over the Atlanta region, where several crosswind transects of plumes from the city and nearby point sources, such as power plants, paper mills and landfills, were flown. The area around Atlanta has large biogenic isoprene emissions, which provided an excellent case for studying the interactions between biogenic and anthropogenic emissions. In this example flight, chemistry in and outside the Atlanta plumes was observed for several hours after emission. The analysis of this flight showcases the strategies implemented to answer some of the main SENEX science questions.
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Affiliation(s)
- C Warneke
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M Trainer
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J A de Gouw
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D D Parrish
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D W Fahey
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - A R Ravishankara
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - A M Middlebrook
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - C A Brock
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J M Roberts
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - S S Brown
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J A Neuman
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - B M Lerner
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D Lack
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D Law
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - G Hübler
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - I Pollack
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - S Sjostedt
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - T B Ryerson
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J B Gilman
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Liao
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Holloway
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Peischl
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J B Nowak
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - K Aikin
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - K-E Min
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - R A Washenfelder
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M G Graus
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M Richardson
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M Z Markovic
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - N L Wagner
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - A Welti
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - P R Veres
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - P Edwards
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J P Schwarz
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - T Gordon
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - W P Dube
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - S McKeen
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Brioude
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - R Ahmadov
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | | | - J J Lin
- Georgia Institute of Technology, Atlanta, GA
| | - A Nenes
- Georgia Institute of Technology, Atlanta, GA
- Foundation for Research and Technology Hellas, Greece
- National Observatory of Athens, Greece
| | - G M Wolfe
- NASA Goddard Space Flight Center, Greenbelt, MD
- University of Maryland Baltimore County
| | - T F Hanisco
- NASA Goddard Space Flight Center, Greenbelt, MD
| | - B H Lee
- University of Washington, Madison, WI
| | | | | | - F N Keutsch
- University of Wisconsin-Madison, Madison, WI
| | - J Kaiser
- University of Wisconsin-Madison, Madison, WI
| | - J Mao
- Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ
- Princeton University
| | - C Hatch
- Department of Chemistry, Hendrix College, 1600 Washington Ave., Conway, AR, USA
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11
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Warneke C, Trainer M, de Gouw JA, Parrish DD, Fahey DW, Ravishankara AR, Middlebrook AM, Brock CA, Roberts JM, Brown SS, Neuman JA, Lerner BM, Lack D, Law D, Hübler G, Pollack I, Sjostedt S, Ryerson TB, Gilman JB, Liao J, Holloway J, Peischl J, Nowak JB, Aikin K, Min KE, Washenfelder RA, Graus MG, Richardson M, Markovic MZ, Wagner NL, Welti A, Veres PR, Edwards P, Schwarz JP, Gordon T, Dube WP, McKeen S, Brioude J, Ahmadov R, Bougiatioti A, Lin JJ, Nenes A, Wolfe GM, Hanisco TF, Lee BH, Lopez-Hilfiker FD, Thornton JA, Keutsch FN, Kaiser J, Mao J, Hatch C. Instrumentation and Measurement Strategy for the NOAA SENEX Aircraft Campaign as Part of the Southeast Atmosphere Study 2013. Atmos Meas Tech 2016; 9:3063-3093. [PMID: 29619117 PMCID: PMC5880326 DOI: 10.5194/amt-9-3063-2016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Natural emissions of ozone-and-aerosol-precursor gases such as isoprene and monoterpenes are high in the southeast of the US. In addition, anthropogenic emissions are significant in the Southeast US and summertime photochemistry is rapid. The NOAA-led SENEX (Southeast Nexus) aircraft campaign was one of the major components of the Southeast Atmosphere Study (SAS) and was focused on studying the interactions between biogenic and anthropogenic emissions to form secondary pollutants. During SENEX, the NOAA WP-3D aircraft conducted 20 research flights between 27 May and 10 July 2013 based out of Smyrna, TN. Here we describe the experimental approach, the science goals and early results of the NOAA SENEX campaign. The aircraft, its capabilities and standard measurements are described. The instrument payload is summarized including detection limits, accuracy, precision and time resolutions for all gas-and-aerosol phase instruments. The inter-comparisons of compounds measured with multiple instruments on the NOAA WP-3D are presented and were all within the stated uncertainties, except two of the three NO2 measurements. The SENEX flights included day- and nighttime flights in the Southeast as well as flights over areas with intense shale gas extraction (Marcellus, Fayetteville and Haynesville shale). We present one example flight on 16 June 2013, which was a daytime flight over the Atlanta region, where several crosswind transects of plumes from the city and nearby point sources, such as power plants, paper mills and landfills, were flown. The area around Atlanta has large biogenic isoprene emissions, which provided an excellent case for studying the interactions between biogenic and anthropogenic emissions. In this example flight, chemistry in and outside the Atlanta plumes was observed for several hours after emission. The analysis of this flight showcases the strategies implemented to answer some of the main SENEX science questions.
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Affiliation(s)
- C Warneke
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M Trainer
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J A de Gouw
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D D Parrish
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D W Fahey
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - A R Ravishankara
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - A M Middlebrook
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - C A Brock
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J M Roberts
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - S S Brown
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J A Neuman
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - B M Lerner
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D Lack
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - D Law
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - G Hübler
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - I Pollack
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - S Sjostedt
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - T B Ryerson
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J B Gilman
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Liao
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Holloway
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Peischl
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J B Nowak
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - K Aikin
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - K-E Min
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - R A Washenfelder
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M G Graus
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M Richardson
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - M Z Markovic
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - N L Wagner
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - A Welti
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - P R Veres
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - P Edwards
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J P Schwarz
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - T Gordon
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - W P Dube
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - S McKeen
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - J Brioude
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | - R Ahmadov
- Cooperative Institute for Research in Environmental Sciences, Univ. of Colorado, Boulder
- Chemical Sciences Division, NOAA Earth System Research Laboratory, Boulder, CO
| | | | - J J Lin
- Georgia Institute of Technology, Atlanta, GA
| | - A Nenes
- Georgia Institute of Technology, Atlanta, GA
- Foundation for Research and Technology Hellas, Greece
- National Observatory of Athens, Greece
| | - G M Wolfe
- NASA Goddard Space Flight Center, Greenbelt, MD
- University of Maryland Baltimore County
| | - T F Hanisco
- NASA Goddard Space Flight Center, Greenbelt, MD
| | - B H Lee
- University of Washington, Madison, WI
| | | | | | - F N Keutsch
- University of Wisconsin-Madison, Madison, WI
| | - J Kaiser
- University of Wisconsin-Madison, Madison, WI
| | - J Mao
- Geophysical Fluid Dynamics Laboratory, NOAA, Princeton, NJ
- Princeton University
| | - C Hatch
- Department of Chemistry, Hendrix College, 1600 Washington Ave., Conway, AR, USA
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13
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Flores JM, Washenfelder RA, Adler G, Lee HJ, Segev L, Laskin J, Laskin A, Nizkorodov SA, Brown SS, Rudich Y. Complex refractive indices in the near-ultraviolet spectral region of biogenic secondary organic aerosol aged with ammonia. Phys Chem Chem Phys 2014; 16:10629-42. [DOI: 10.1039/c4cp01009d] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Distribution of the number of N atoms and the change in the complex refractive index of unreacted and NH3-aged limonene SOA.
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Affiliation(s)
- J. M. Flores
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
| | - R. A. Washenfelder
- Cooperative Institute for Research in Environmental Sciences
- University of Colorado
- Boulder, USA
- Chemical Sciences Division
- Earth System Research Laboratory
| | - G. Adler
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
| | - H. J. Lee
- Department of Chemistry
- University of California
- Irvine, USA
| | - L. Segev
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
| | - J. Laskin
- Physical Sciences Division
- Pacific Northwest National Laboratory
- Richland, USA
| | - A. Laskin
- Environmental Molecular Sciences Laboratory
- Pacific Northwest National Laboratory
- Richland, USA
| | | | - S. S. Brown
- Chemical Sciences Division
- Earth System Research Laboratory
- National Oceanic and Atmospheric Administration
- Boulder, USA
| | - Y. Rudich
- Department of Earth and Planetary Sciences
- Weizmann Institute of Science
- Rehovot 76100, Israel
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14
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Wagner NL, Riedel TP, Roberts JM, Thornton JA, Angevine WM, Williams EJ, Lerner BM, Vlasenko A, Li SM, Dubé WP, Coffman DJ, Bon DM, de Gouw JA, Kuster WC, Gilman JB, Brown SS. The sea breeze/land breeze circulation in Los Angeles and its influence on nitryl chloride production in this region. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2012jd017810] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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15
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Neuman JA, Trainer M, Aikin KC, Angevine WM, Brioude J, Brown SS, de Gouw JA, Dube WP, Flynn JH, Graus M, Holloway JS, Lefer BL, Nedelec P, Nowak JB, Parrish DD, Pollack IB, Roberts JM, Ryerson TB, Smit H, Thouret V, Wagner NL. Observations of ozone transport from the free troposphere to the Los Angeles basin. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016919] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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16
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Pollack IB, Ryerson TB, Trainer M, Parrish DD, Andrews AE, Atlas EL, Blake DR, Brown SS, Commane R, Daube BC, de Gouw JA, Dubé WP, Flynn J, Frost GJ, Gilman JB, Grossberg N, Holloway JS, Kofler J, Kort EA, Kuster WC, Lang PM, Lefer B, Lueb RA, Neuman JA, Nowak JB, Novelli PC, Peischl J, Perring AE, Roberts JM, Santoni G, Schwarz JP, Spackman JR, Wagner NL, Warneke C, Washenfelder RA, Wofsy SC, Xiang B. Airborne and ground-based observations of a weekend effect in ozone, precursors, and oxidation products in the California South Coast Air Basin. ACTA ACUST UNITED AC 2012. [DOI: 10.1029/2011jd016772] [Citation(s) in RCA: 88] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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17
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Washenfelder RA, Young CJ, Brown SS, Angevine WM, Atlas EL, Blake DR, Bon DM, Cubison MJ, de Gouw JA, Dusanter S, Flynn J, Gilman JB, Graus M, Griffith S, Grossberg N, Hayes PL, Jimenez JL, Kuster WC, Lefer BL, Pollack IB, Ryerson TB, Stark H, Stevens PS, Trainer MK. The glyoxal budget and its contribution to organic aerosol for Los Angeles, California, during CalNex 2010. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2011jd016314] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- R. A. Washenfelder
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - C. J. Young
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - S. S. Brown
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - W. M. Angevine
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - E. L. Atlas
- Division of Marine and Atmospheric Chemistry; University of Miami; Miami Florida USA
| | - D. R. Blake
- Department of Chemistry; University of California; Irvine California USA
| | - D. M. Bon
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - M. J. Cubison
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Department of Chemistry and Biochemistry; University of Colorado at Boulder; Boulder USA
| | - J. A. de Gouw
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - S. Dusanter
- Center for Research in Environmental Science, School of Public and Environmental Affairs and Department of Chemistry; Indiana University; Bloomington Indiana USA
- Université Lille Nord de France; Lille France
- EMDouai; Douai France
| | - J. Flynn
- Department of Earth and Atmospheric Sciences; University of Houston; Houston Texas USA
| | - J. B. Gilman
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - M. Graus
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - S. Griffith
- Center for Research in Environmental Science, School of Public and Environmental Affairs and Department of Chemistry; Indiana University; Bloomington Indiana USA
| | - N. Grossberg
- Department of Earth and Atmospheric Sciences; University of Houston; Houston Texas USA
| | - P. L. Hayes
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Department of Chemistry and Biochemistry; University of Colorado at Boulder; Boulder USA
| | - J. L. Jimenez
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Department of Chemistry and Biochemistry; University of Colorado at Boulder; Boulder USA
| | - W. C. Kuster
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - B. L. Lefer
- Department of Earth and Atmospheric Sciences; University of Houston; Houston Texas USA
| | - I. B. Pollack
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - T. B. Ryerson
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
| | - H. Stark
- Cooperative Institute for Research in Environmental Sciences; University of Colorado at Boulder; Boulder Colorado USA
- Aerodyne Research, Incorporated; Billerica Massachusetts USA
| | - P. S. Stevens
- Center for Research in Environmental Science, School of Public and Environmental Affairs and Department of Chemistry; Indiana University; Bloomington Indiana USA
| | - M. K. Trainer
- Chemical Sciences Division, Earth System Research Laboratory; National Oceanic and Atmospheric Administration; Boulder Colorado USA
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18
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Ur Rahman AA, Lophatananon A, Lobaz J, Robinson F, Brown SS, Parker T, Easton D, Kote-Jarai Z, Pocock R, Dearnaley D, Guy M, Wilkinson RA, Hall AL, Sawyer E, Page E, Liu JF, Eeles RA, Muir KR. P2-250 Omega 3 polyunsaturated fatty acids (PUFAs) and risk of early onset prostate cancer. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976j.83] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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19
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Cooper SD, Fletcher BL, Rehder Silinski MA, Brown SS, Lodge JW, Fernando RA, Collins BJ. Determination of L-Ephedrine, Pseudoephedrine, and Caffeine in Rat Plasma by Liquid Chromatography-Tandem Mass Spectrometry. J Anal Toxicol 2011; 35:341-8. [DOI: 10.1093/anatox/35.6.341] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Abstract
Ozone plays a key role in both the Earth's radiative budget and photochemistry. Accurate, robust analytical techniques for measuring its atmospheric abundance are of critical importance. Cavity ring-down spectroscopy has been successfully used for sensitive and accurate measurements of many atmospheric species. However, this technique has not been used for atmospheric measurements of ozone, because the strongest ozone absorption bands occur in the ultraviolet spectral region, where Rayleigh and Mie scattering cause significant cavity losses and dielectric mirror reflectivities are limited. Here, we describe a compact instrument that measures O3 by chemical conversion to NO2 in excess NO, with subsequent detection by cavity ring-down spectroscopy. This method provides a simple, accurate, and high-precision measurement of atmospheric ozone. The instrument consists of two channels. The sum of NO2 and converted O3 (defined as Ox) is measured in the first channel, while NO2 alone is measured in the second channel. NO2 is directly detected in each channel by cavity ring-down spectroscopy with a laser diode light source at 404 nm. The limit of detection for O3 is 26 pptv (2 sigma precision) at 1 s time resolution. The accuracy of the measurement is ±2.2%, with the largest uncertainty being the effective NO2 absorption cross-section. The linear dynamic range of the instrument has been verified from the detection limit to above 200 ppbv (r2>99.99%). The observed precision on signal (2 sigma) with 41 ppbv O3 is 130 pptv in 1 s. Comparison of this instrument to UV absorbance instruments for ambient O3 concentrations shows linear agreement (r2=99.1%) with slope of 1.012±0.002.
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Affiliation(s)
- R A Washenfelder
- Cooperative Institute for Research in Environmental Sciences, 216 UCB, University of Colorado, Boulder, Colorado 80309, United States.
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21
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Peischl J, Ryerson TB, Holloway JS, Parrish DD, Trainer M, Frost GJ, Aikin KC, Brown SS, Dubé WP, Stark H, Fehsenfeld FC. A top-down analysis of emissions from selected Texas power plants during TexAQS 2000 and 2006. ACTA ACUST UNITED AC 2010. [DOI: 10.1029/2009jd013527] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Feierabend KJ, Flad JE, Brown SS, Burkholder JB. HCO Quantum Yields in the Photolysis of HC(O)C(O)H (Glyoxal) between 290 and 420 nm. J Phys Chem A 2009; 113:7784-94. [DOI: 10.1021/jp9033003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Karl J. Feierabend
- Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305-3328, and Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, Colorado 80309
| | - Jonathan E. Flad
- Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305-3328, and Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, Colorado 80309
| | - S. S. Brown
- Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305-3328, and Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, Colorado 80309
| | - James B. Burkholder
- Earth System Research Laboratory, Chemical Sciences Division, National Oceanic and Atmospheric Administration, 325 Broadway, Boulder, Colorado 80305-3328, and Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, Colorado 80309
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23
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Simon H, Kimura Y, McGaughey G, Allen DT, Brown SS, Osthoff HD, Roberts JM, Byun D, Lee D. Modeling the impact of ClNO2on ozone formation in the Houston area. ACTA ACUST UNITED AC 2009. [DOI: 10.1029/2008jd010732] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Stark H, Brown SS, Goldan PD, Aldener M, Kuster WC, Jakoubek R, Fehsenfeld FC, Meagher J, Bates TS, Ravishankara AR. Influence of nitrate radical on the oxidation of dimethyl sulfide in a polluted marine environment. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007669] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- H. Stark
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - S. S. Brown
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - P. D. Goldan
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - M. Aldener
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - W. C. Kuster
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - R. Jakoubek
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - F. C. Fehsenfeld
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - J. Meagher
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
| | - T. S. Bates
- Pacific Marine Environmental Laboratory; NOAA; Seattle Washington USA
| | - A. R. Ravishankara
- Chemical Sciences Division; Earth System Research Laboratory, NOAA; Boulder Colorado USA
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26
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Neuman JA, Parrish DD, Trainer M, Ryerson TB, Holloway JS, Nowak JB, Swanson A, Flocke F, Roberts JM, Brown SS, Stark H, Sommariva R, Stohl A, Peltier R, Weber R, Wollny AG, Sueper DT, Hubler G, Fehsenfeld FC. Reactive nitrogen transport and photochemistry in urban plumes over the North Atlantic Ocean. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd007010] [Citation(s) in RCA: 76] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- J. A. Neuman
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - D. D. Parrish
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - M. Trainer
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - T. B. Ryerson
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - J. S. Holloway
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - J. B. Nowak
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - A. Swanson
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - F. Flocke
- National Center for Atmospheric Research; Boulder Colorado USA
| | - J. M. Roberts
- Chemical Sciences Division, Earth System Research Laboratory; NOAA; Boulder Colorado USA
| | - S. S. Brown
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - H. Stark
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - R. Sommariva
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - A. Stohl
- Norwegian Institute for Air Research; Kjeller Norway
| | - R. Peltier
- School of Earth and Atmospheric Sciences; Georgia Institute of Technology; Atlanta Georgia USA
| | - R. Weber
- School of Earth and Atmospheric Sciences; Georgia Institute of Technology; Atlanta Georgia USA
| | - A. G. Wollny
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - D. T. Sueper
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - G. Hubler
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
| | - F. C. Fehsenfeld
- Cooperative Institute for Research in Environmental Sciences; University of Colorado; Boulder Colorado USA
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Brown SS, Ryerson TB, Wollny AG, Brock CA, Peltier R, Sullivan AP, Weber RJ, Dubé WP, Trainer M, Meagher JF, Fehsenfeld FC, Ravishankara AR. Variability in Nocturnal Nitrogen Oxide Processing and Its Role in Regional Air Quality. Science 2006; 311:67-70. [PMID: 16400145 DOI: 10.1126/science.1120120] [Citation(s) in RCA: 298] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Nitrogen oxides in the lower troposphere catalyze the photochemical production of ozone (O3) pollution during the day but react to form nitric acid, oxidize hydrocarbons, and remove O3 at night. A key nocturnal reaction is the heterogeneous hydrolysis of dinitrogen pentoxide, N2O5. We report aircraft measurements of NO3 and N2O5, which show that the N2O5 uptake coefficient, g(N2O5), on aerosol particles is highly variable and depends strongly on aerosol composition, particularly sulfate content. The results have implications for the quantification of regional-scale O3 production and suggest a stronger interaction between anthropogenic sulfur and nitrogen oxide emissions than previously recognized.
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Affiliation(s)
- S S Brown
- National Oceanic and Atmospheric Administration (NOAA) Earth System Research Laboratory, R/CSD2, 325 Broadway, Boulder, CO 80305, USA.
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Haslam C, Atkinson S, Brown SS, Haslam RA. Anxiety and depression in the workplace: effects on the individual and organisation (a focus group investigation). J Affect Disord 2005; 88:209-15. [PMID: 16122810 DOI: 10.1016/j.jad.2005.07.009] [Citation(s) in RCA: 123] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/04/2005] [Revised: 07/22/2005] [Accepted: 07/22/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND While the prevalence of anxiety and depression has increased, little is known of the impact on working life. The aim of this study was to explore the effects of anxiety and depression and the treatment for these conditions on performance and safety in the workplace. METHOD Nine focus groups were conducted with employees who had suffered anxiety and depression. A further 3 groups comprised staff from human resources and occupational health. The sample comprised 74 individuals aged 18-60 years, from a range of occupations. Results were presented to a panel of experts to consider the clinical implications. RESULTS Workers reported that the symptoms and medication impaired work performance, describing accidents which they attributed to their condition/medication. Respondents were largely unprepared for the fact that the medication might make them feel worse initially. Employees were reluctant to disclose their condition to colleagues due to the stigma attached to mental illness. LIMITATIONS People who had experienced problems with managing their symptoms and medication at work are more likely to volunteer to participate in such a study than those who had a satisfactory experience. Also, the researchers had no background information on severity of mental health problems of participants. CONCLUSIONS Anxiety and depression were associated with impaired work performance and safety. The authors consider the implications for health care and the management of mental health problems at work.
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Affiliation(s)
- C Haslam
- Institute of Work, Health and Organisations, University of Nottingham, William Lee Buildings 8, Nottingham Science and Technology Park, University Boulevard, Nottingham NG7 2RQ, UK.
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Rosalki SB, Brown SS, Fleck A, McCormack JJ, Padmore GR, Smith AF, Wilkinson JH. Technical bulletin No. 35. Investigation of the validity of temperature correction factors for serum aspartate and alanine transaminases. Ann Clin Biochem 2005; 12:78-82. [PMID: 15637928 DOI: 10.1177/000456327501200123] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- S B Rosalki
- Department of Diagnostic Chemical Pathology, St. Mary's Hospital, London W.2
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Brown SS, Kawanabe K, Manaka M, Williams P, Good V, Clarke IC. Discerning alumina ball wear from confounding metal transfer artifact. J Biomed Mater Res B Appl Biomater 2005; 75:400-4. [PMID: 16037941 DOI: 10.1002/jbm.b.30327] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
On dismounting a ceramic femoral ball from its metal trunnion, there is usually a range of gray metallic bands transferred to the trunnion bore inside the ball. This creates an artifact that may compromise detection by weight of the exceedingly low wear rates of ceramic balls. The objective of this study was to compare the weight trending of the metal trunnions and their ceramic balls during conditioning studies. Our hypothesis was that a pretest conditioning protocol would eliminate or greatly reduce the metal transfer artifact. The balls and tapers were placed on a hip simulator under 300-600 load cycles but with no articulation. The balls were then dismounted from the trunnions, and both were cleaned and weighed. This was repeated 6-23 times. We developed a novel hydraulic method for dismounting balls from trunnions that proved to be safe and efficient. There was significant weight loss in the trunnions after the ball removal, but there was no corresponding weight gain in the alumina balls. The weight effect of the metal transfer appeared to have been removed from the balls with our standard cleaning procedures. Therefore, wear rates for alumina balls may be gravimetrically determined without compensating for the metal transfer from trunnion to ball.
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Affiliation(s)
- S S Brown
- Peterson Tribology Lab, Orthopaedic Research Center, Loma Linda University Medical Center, Department of Orthopaedic Surgery, 11406 Loma Linda Drive #606, Loma Linda, California 92354, USA.
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Thomas BF, Zeisel SH, Busby MG, Hill JM, Mitchell RA, Scheffler NM, Brown SS, Bloeden LT, Dix KJ, Jeffcoat AR. Quantitative analysis of the principle soy isoflavones genistein, daidzein and glycitein, and their primary conjugated metabolites in human plasma and urine using reversed-phase high-performance liquid chromatography with ultraviolet detection. J Chromatogr B Biomed Sci Appl 2001; 760:191-205. [PMID: 11530977 DOI: 10.1016/s0378-4347(01)00269-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Soy isoflavones are becoming of increasing interest as nutritional agents which can be used to combat osteoporosis and hyperlipidemia, and are also being considered as potential cancer chemopreventive compounds. However, prior to their formulation and distribution as therapeutic agents, thorough pharmacokinetic and toxicological assessment needs to be completed in men and women in a variety of health conditions in order to ensure their therapeutic efficacy and safety. At this time, studies of purified soy isoflavones are possible, and are being designed to fully evaluate the pharmacological utility of these preparations. In support of these studies, quantitative analysis of soy isoflavones in biological fluids can be accomplished with a wide variety of methods and analytical instrumentation. However, the relatively ubiquitous presence of high-performance liquid chromatography with ultraviolet detection (HPLC-UV) in most analytical laboratories, the relative ease of its operation, and the lesser expense of this instrumentation as compared to more sophisticated techniques such as liquid chromatography-mass spectrometry, offers some distinct advantages for its use in pharmacokinetic studies. In this manuscript, the development and validation of an HPLC-UV method for the quantitation of the principal soy isoflavones, genistein, daidzein, and glycitein, and their primary metabolites, in human plasma and urine is described. This analytical approach allows for pharmacologically relevant concentrations of the analytes and their principle metabolites to be detected, and has been validated in close agreement with the US Food and Drug Administration's guidelines for the validation of methods to be used in support of pharmacokinetic studies.
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Affiliation(s)
- B F Thomas
- Research Triangle Institute, Research Triangle Park, NC 27709, USA
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Rall WF, Schmidt PM, Lin X, Brown SS, Ward AC, Hansen CT. Factors affecting the efficiency of embryo cryopreservation and rederivation of rat and mouse models. ILAR J 2001; 41:221-7. [PMID: 11123182 DOI: 10.1093/ilar.41.4.221] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The efficiency of embryo banking for rat and mouse models of human disease and normal biological processes depends on the ease of obtaining embryos. Authors report on the effect of genotype on embryo production and rederivation. In an effort to establish banks of cryopreserved embryos, they provide two databases for comparing banking efficiency: one that contains the embryo collection results from approximately 11,000 rat embryo donors (111 models) and another that contains the embryo collection results from 4,023 mouse embryo donors (57 induced mutant models). The genotype of donor females affected the efficiency of embryo collection in two ways. First, the proportion of females yielding embryos varied markedly among genotypes (rats: 16-100 %, mean =71 %; mice: 24-95 %, mean =65 %). Second, the mean number of embryos recovered from females yielding embryos varied considerably (rats: 4-10.6, mean =7.8; mice 5.3-32.2, mean =13.7). Genotype also affected the efficiency of rederivation of banked rat and mouse embryos models by embryo transfer. For rats, thawed embryos (n =684) from 33 genotypes were transferred into 66 recipient females (pregnancy rate, 78 %). The average rate of developing live newborns for individual rat genotypes was 30 % with a range of 10 to 58 %. For mice, thawed embryos (n =2,064) from 59 genotypes were transferred into 119 pseudopregnant females (pregnancy rate: 76 %). The average rate of development of individual mouse genotypes was 33 % with a range of 11 to 53 %. This analysis demonstrates that genotype is an important consideration when planning embryo banking programs.
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Affiliation(s)
- W F Rall
- Veterinary Resources Program, Office of Research Services, National Institutes of Health, Bethesda, Maryland, USA
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Beningo KA, Lillie SH, Brown SS. The yeast kinesin-related protein Smy1p exerts its effects on the class V myosin Myo2p via a physical interaction. Mol Biol Cell 2000; 11:691-702. [PMID: 10679024 PMCID: PMC14803 DOI: 10.1091/mbc.11.2.691] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
We have discovered evidence for a physical interaction between a class V myosin, Myo2p, and a kinesin-related protein, Smy1p, in budding yeast. These proteins had previously been linked by genetic and colocalization studies, but we had been unable to determine the nature of their association. We now show by two-hybrid analysis that a 69-amino acid region of the Smy1p tail interacts with the globular portion of the Myo2p tail. Deletion of this myosin-binding region of Smy1p eliminates its ability to colocalize with Myo2p and to overcome the myo2-66 mutant defects, suggesting that the interaction is necessary for these functions. Further insights about the Smy1p-Myo2p interaction have come from studies of a new mutant allele, myo2-2, which causes a loss of Myo2p localization. We report that Smy1p localization is also lost in the myo2-2 mutant, demonstrating that Smy1p localization is dependent on Myo2p. We also found that overexpression of Smy1p partially restores myo2-2p localization in a myosin-binding region-dependent manner. Thus, overexpression of Smy1p can overcome defects in both the head and tail domains of Myo2p (caused by the myo2-66 and myo2-2 alleles, respectively). We propose that Smy1p enhances some aspect of Myo2p function, perhaps delivery or docking of vesicles at the bud tip.
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Affiliation(s)
- K A Beningo
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor, Michigan 48109-0616, USA.
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Abstract
Organelle transport has been proposed to proceed in two steps: long-range transport along microtubules and local delivery via actin filaments. This model is supported by recent studies of pigment transport in several cell types and transport in neurons, and in several cases, class V myosin has been implicated as the actin-based motor. Mutations in mice (dilute) and yeast (myo2) have also implicated this class of myosin in organelle transport, and genetic interactions in yeast have indicated that a kinesin-related protein (Smy1p) plays a supporting role. This link between members of two different motor superfamilies has now taken a surprising turn: There is evidence for a physical interaction between class V myosins and kinesin or Smy1p in both mice and yeast.
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Affiliation(s)
- S S Brown
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor 48109, USA.
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Affiliation(s)
- J Bamford
- Centre for Human Communication and Deafness, University of Manchester, UK
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Abstract
We have previously reported that a defect in Myo2p, a myosin in budding yeast (Saccharomyces cerevisiae), can be partially corrected by overexpression of Smy1p, which is by sequence a kinesin-related protein (Lillie, S.H., and S.S. Brown. 1992. Nature. 356:358- 361). Such a functional link between putative actin- and microtubule-based motors is surprising, so here we have tested the prediction that Smy1p indeed acts as a microtubule-based motor. Unexpectedly, we found that abolition of microtubules by nocodazole does not interfere with the ability of Smy1p to correct the mutant Myo2p defect, nor does it interfere with the ability of Smy1p to localize properly. In addition, other perturbations of microtubules, such as treatment with benomyl or introduction of tubulin mutations, do not exacerbate the Myo2p defect. Furthermore, a mutation in SMY1 strongly predicted to destroy motor activity does not destroy Smy1p function. We have also observed a genetic interaction between SMY1 and two of the late SEC mutations, sec2 and sec4. This indicates that Smy1p can play a role even when Myo2p is wild type, and that Smy1p acts at a specific step of the late secretory pathway. We conclude that Smy1p does not act as a microtubule-based motor to localize properly or to compensate for defective Myo2p, but that it must instead act in some novel way.
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Affiliation(s)
- S H Lillie
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor, Michigan 48109-0616, USA
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Abstract
It has been a banner year for the study of yeast myosins. Thanks to the completion of the Saccharomyces cerevisiae genome project, it is now known that budding yeast contains a total of five myosins. Furthermore, functions have been newly ascribed to several of them: two have been implicated in endocytosis, and another has been implicated in generating asymmetry between mother and daughter cells.
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Affiliation(s)
- S S Brown
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
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Haarer BK, Corbett A, Kweon Y, Petzold AS, Silver P, Brown SS. SEC3 mutations are synthetically lethal with profilin mutations and cause defects in diploid-specific bud-site selection. Genetics 1996; 144:495-510. [PMID: 8889515 PMCID: PMC1207545 DOI: 10.1093/genetics/144.2.495] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023] Open
Abstract
Replacement of the wild-type yeast profilin gene (PFY1) with a mutated form (pfy1-111) that has codon 72 changed to encode glutamate rather than arginine results in defects similar to, but less severe than, those that result from complete deletion of the profilin gene. We have used a colony color-sectoring assay to identify mutations that cause pfy1-111, but not wild-type, cells to be inviable. These profilin synthetic lethal (psl) mutations result in various degrees of abnormal growth, morphology, and temperature sensitivity in PFY1 cells. We have examined psl1 strains in the most detail. Interestingly, these strains display a diploid-specific defect in bud-site selection; haploid strains bud normally, while homozygous diploid strains show a dramatic increase in random budding. We discovered that PSL1 is the late secretory gene, SEC3, and have found that mutations in several other late secretory genes are also synthetically lethal with pfy1-111. Our results are likely to reflect an interdependence between the actin cytoskeleton and secretory processes in directing cell polarity and growth. Moreover, they indicate that the secretory pathway is especially crucial for maintaining budding polarity in diploids.
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Affiliation(s)
- B K Haarer
- Department of Anatomy and Cell Biology, University of Michigan, Ann Arbor 48109, USA.
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Affiliation(s)
- H P Veit
- Department of Biomedical Sciences and Pathobiology Virginia-Maryland Regional College of Veterinary Medicine, Virginia Tech, Blacksburg 24061-0442, USA
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Grandjean P, Brown SS, Reavey P, Young DS. Biomarkers in environmental toxicology: state of the art. Clin Chem 1995; 41:1902-4. [PMID: 7497652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- P Grandjean
- Institute of Community Health, Odense University, Denmark
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41
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Affiliation(s)
- P Grandjean
- Institute of Community Health, Odense University, Denmark
| | - S S Brown
- Institute of Community Health, Odense University, Denmark
| | - P Reavey
- Institute of Community Health, Odense University, Denmark
| | - D S Young
- Institute of Community Health, Odense University, Denmark
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Surender R, Bradlow J, Coulter A, Doll H, Brown SS. Prospective study of trends in referral patterns in fundholding and non-fundholding practices in the Oxford region, 1990-4. BMJ 1995; 311:1205-8. [PMID: 7488902 PMCID: PMC2551123 DOI: 10.1136/bmj.311.7014.1205] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
OBJECTIVE To compare outpatient referral patterns in fundholding and non-fundholding practices before and after the NHS reforms in April 1991. DESIGN Prospective collection of data on general practitioners' referrals to specialist outpatient clinics between June 1990 and January 1994 and detailed comparisons of three phases--October 1990 to March 1991 (phase 1), October 1991 to March 1992 (phase 2), and October 1993 to January 1994 (phase 3). SETTING 10 first wave fundholding practices and six non-fundholding practices in the Oxford region. SUBJECTS Patients referred to consultant out-patient clinics. RESULTS NHS referral rates increased in fundholding practices in phase 2 and phase 3 of the study by 8.1/1000 patients a year (95% confidence interval 5.7 to 10.5), an increase of 7.5% from phase 1 (107.3/1000) to phase 3 (115.4/1000). Non-fundholders' rates increased significantly, by 25.3/1000 patients (22.5-28.1), an increase of 26.6% from phase 1 (95.0/1000) to phase 3 (120.3/1000). The fundholders' referral rates to private clinics decreased by 8.8%, whereas those from non-fundholding practices increased by 12.2%. The proportion of referrals going outside district boundaries did not change significantly. Three of the four practices entering the third and fourth wave of fundholding increased their referral rates significantly in the year before becoming fundholders. CONCLUSIONS No evidence existed that budgetary pressures caused first wave fundholders to reduce referral rates, although the method of budget allocation may have encouraged general practitioners to inflate their referral rates in the preparatory year. Despite investment in new practice based facilities, no evidence yet exists that fundholding encourages a shift away from specialist care.
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Affiliation(s)
- R Surender
- Department of Public Health and Primary Care, University of Oxford, Radcliffe Infirmary
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Affiliation(s)
- S S Brown
- Institute of Medicine, Washington, DC, USA
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44
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Gao M, Levy LS, Faux SP, Aw TC, Braithwaite RA, Brown SS. Use of molecular epidemiological techniques in a pilot study on workers exposed to chromium. Occup Environ Med 1994; 51:663-8. [PMID: 8000490 PMCID: PMC1128074 DOI: 10.1136/oem.51.10.663] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
OBJECTIVES Molecular epidemiological techniques, capable of detecting damage to DNA, were used to see if such damage occurred in the lymphocytes of a group of workers exposed to chromium. The two aims of this pilot study were to see if these new techniques might make useful biological monitoring tools for workers exposed to chromium and also, to help assess whether the current occupational exposure limit for chromium (VI) was sufficiently protective in this specific working situation. METHODS Volunteer groups of 10 workers exposed to chromium and 10 non-exposed workers provided urine and blood samples towards the end of the working week. Chromium concentrations were measured in whole blood, plasma, lymphocytes, and urine. Lymphocytes were used to examine two forms of DNA damage in the two groups; these were the level of DNA strand breakage and, the production of 8-hydroxydeoxyguanosine. RESULTS Chromium concentration in whole blood, plasma, and urine of workers exposed to chromium was significantly raised (P < 0.01) compared with non-exposed controls, but in isolated lymphocytes, there was only a modest but significant (P < 0.05) increase in chromium in the group exposed to chromium. There was no difference in the levels of DNA strand breaks or 8-hydroxydeoxyguanosine between the groups. Air monitoring for chromium was not undertaken but current levels for the group exposed to chromium were reported to be around 0.01 mg/m3, which is 20% of the current United Kingdom occupational exposure limit. CONCLUSIONS We were unable to detect any damage in lymphocytic DNA due to exposure to chromium. This may have been due to the low chromium exposure (< 20% of the United Kingdom occupational exposure limit), the ability of plasma to detoxify chromium (VI) to chromium (III) before it reached the lymphocytes, or perhaps the insensitivity of the molecular techniques used. It is now important to test these and other such techniques on groups exposed to levels closer to the United Kingdom occupational exposure limit.
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Affiliation(s)
- M Gao
- Institute of Occupational Health, University of Birmingham, Edgbaston
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46
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Grandjean P, Brown SS, Reavey P, Young DS. Biomarkers of chemical exposure: state of the art. Clin Chem 1994; 40:1360-2. [PMID: 8013119] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- P Grandjean
- Institute of Community Health, Odense University, Denmark
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47
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Affiliation(s)
- P Grandjean
- Institute of Community Health, Odense University, Denmark
| | - S S Brown
- Institute of Community Health, Odense University, Denmark
| | - P Reavey
- Institute of Community Health, Odense University, Denmark
| | - D S Young
- Institute of Community Health, Odense University, Denmark
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Lillie SH, Brown SS. Immunofluorescence localization of the unconventional myosin, Myo2p, and the putative kinesin-related protein, Smy1p, to the same regions of polarized growth in Saccharomyces cerevisiae. J Biophys Biochem Cytol 1994; 125:825-42. [PMID: 8188749 PMCID: PMC2120074 DOI: 10.1083/jcb.125.4.825] [Citation(s) in RCA: 256] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Myo2 protein (Myo2p), an unconventional myosin in the budding yeast Saccharomyces cerevisiae, has been implicated in polarized growth and secretion by studies of the temperature-sensitive myo2-66 mutant. Overexpression of Smy1p, which by sequence is a kinesin-related protein, can partially compensate for defects in the myo2 mutant (Lillie, S. H. and S. S. Brown, 1992. Nature (Lond.). 356:358-361). We have now immunolocalized Smy1p and Myo2p. Both are concentrated in regions of active growth, as caps at incipient bud sites and on small buds, at the mother-bud neck just before cell separation, and in mating cells as caps on shmoo tips and at the fusion bridge of zygotes. Double labeling of cells with either Myo2p or Smy1p antibody plus phalloidin was used to compare the localization of Smy1p and Myo2p to actin, and by extrapolation, to each other. These studies confirmed that Myo2p and Smy1p colocalize, and are concentrated in the same general regions of the cell as actin spots. However, neither colocalizes with actin. We noted a correlation in the behavior of Myo2p, Smy1p, and actin, but not microtubules, under a number of circumstances. In cdc4 and cdc11 mutants, which produce multiple buds, Myo2p and Smy1p caps were found only in the subset of buds that had accumulations of actin. Mutations in actin or secretory genes perturb actin, Smy1p and Myo2p localization. The rearrangements of Myo2p and Smy1p correlate temporally with those of actin spots during the cell cycle, and upon temperature and osmotic shift. In contrast, microtubules are not grossly affected by these perturbations. Although wild-type Myo2p localization does not require Smy1p, Myo2p staining is brighter when SMY1 is overexpressed. The myo2 mutant, when shifted to restrictive temperature, shows a permanent loss in Myo2p localization and actin polarization, both of which can be restored by SMY1 overexpression. However, the lethality of MYO2 deletion is not overcome by SMY1 overexpression. We noted that the myo2 mutant can recover from osmotic shift (unlike actin mutants; Novick, P., and D. Botstein. 1985. Cell. 40:405-416). We have also determined that the myo2-66 allele encodes a Lys instead of a Glu at position 511, which lies at an actin-binding face in the motor domain.
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Affiliation(s)
- S H Lillie
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor 48109-0616
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Abstract
We have isolated a fourth myosin gene (MYO4) in yeast (Saccharomyces cerevisiae). MYO4 encodes a approximately 170 kDa (1471 amino acid) class V myosin, using the classification devised by Cheney et al. (1993a; Cell Motil. Cytoskel. 24, 215–223); the motor domain is followed by a neck region containing six putative calmodulin-binding sites and a tail with a short potential ‘coiled-coil’ domain. A comparison with other myosins in GenBank reveals that Myo4 protein is most closely related to the yeast Myo2 protein, another class V myosin. Deletion of MYO4 produces no detectable phenotype, either alone or in conjunction with mutations in myo2 or other myosin genes, the actin gene, or secretory genes. However, overexpression of MYO4 or MYO2 results in several morphological abnormalities, including the formation of short strings of unseparated cells in diploid strains, or clusters of cells in haploid strains. Alterations of MYO4 or MYO2 indicate that neither the motor domains nor tails of these myosins are required to confer the overexpression phenotype, whereas the neck region may be required. Although this phenotype is similar to that seen upon MYO1 deletion, we provide evidence that the overexpression of Myo4p or Myo2p is not simply interfering with Myo1p function.
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Affiliation(s)
- B K Haarer
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor 48109-0616
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50
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Abstract
We have mutated two regions within the yeast profilin gene in an effort to functionally dissect the roles of actin and phosphatidylinositol 4,5-bisphosphate (PIP2) binding in profilin function. A series of truncations was carried out at the C terminus of profilin, a region that has been implicated in actin binding. Removal of the last three amino acids nearly eliminated the ability of profilin to bind polyproline in vitro but had no dramatic in vivo effects. Thus, the extreme C terminus is implicated in polyproline binding, but the physiological relevance of this interaction is called into question. More extensive truncation, of up to eight amino acids, had in vivo effects of increasing severity and resulted in changes in conformation and expression level of the mutant profilins. However, the ability of these mutants to bind actin in vitro was not eliminated, suggesting that this region cannot be solely responsible for actin binding. We also mutagenized a region of profilin that we hypothesized might be involved in PIP2 binding. Alteration of basic amino acids in this region produced mutant profilins that functioned well in vivo. Many of these mutants, however, were unable to suppress the loss of adenylate cyclase-associated protein (Cap/Srv2p [A. Vojtek, B. Haarer, J. Field, J. Gerst, T. D. Pollard, S. S. Brown, and M. Wigler, Cell 66:497-505, 1991]), indicating that a defect could be demonstrated in vivo. In vitro assays demonstrated that the inability to suppress loss of Cap/Srv2p correlated with a defect in the interaction with actin, independently of whether PIP2 binding was reduced. Since our earlier studies of Acanthamoeba profilins suggested the importance of PIP2 binding for suppression, we conclude that both activities are implicated and that an interplay between PIP2 binding and actin binding may be important for profilin function.
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Affiliation(s)
- B K Haarer
- Department of Anatomy and Cell Biology, University of Michigan Medical School, Ann Arbor 48109
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