Results 31 to 40 of about 1,345,257 (199)

Comparison of different real time VOC measurement techniques in a ponderosa pine forest [PDF]

Atmospheric Chemistry and Physics, 2013
Volatile organic compound (VOC) mixing ratios measured by five independent instruments are compared at a forested site dominated by ponderosa pine (Pinus Ponderosa) during the BEACHON-ROCS field study in summer 2010.
L. Kaser, T. Karl, R. Schnitzhofer, M. Graus, I. S. Herdlinger-Blatt, J. P. DiGangi, B. Sive, A. Turnipseed, R. S. Hornbrook, W. Zheng, F. M. Flocke, A. Guenther, F. N. Keutsch, E. Apel, A. Hansel   +14 more
doaj   +1 more source

Eddy covariance emission and deposition flux measurements using proton transfer reaction – time of flight – mass spectrometry (PTR-TOF-MS): comparison with PTR-MS measured vertical gradients and fluxes [PDF]

Atmospheric Chemistry and Physics, 2013
During summer 2010, a proton transfer reaction – time of flight – mass spectrometer (PTR-TOF-MS) and a quadrupole proton transfer reaction mass spectrometer (PTR-MS) were deployed simultaneously for one month in an orange orchard in the Central Valley of
R. Weber, J. Karlik, S. Fares, J. Timkovsky, A. H. Goldstein, J.-H. Park, R. Holzinger   +6 more
doaj   +1 more source

Butter and butter oil classification by PTR-MS [PDF]

European Food Research and Technology, 2007
The potential of proton transfer reaction mass spectrometry (PTR-MS) as a tool for classification of milk fats was evaluated in relation to quality and authentication issues. Butters and butter oils were subjected to heat and off-flavouring treatments in order to create sensorially defective samples.
van Ruth, S.M., Koot, A.H., Akkermans, W., Araghipour, N., Rozijn, M., Baltussen, M.A.H., Wisthaler, A., Mark, T.D., Frankhuizen, R.   +8 more
openaire   +1 more source

Measuring OVOCs and VOCs by PTR-MS in an urban roadside microenvironment of Hong Kong: relative humidity and temperature dependence, and field intercomparisons [PDF]

Atmospheric Measurement Techniques, 2016
Volatile organic compound (VOC) control is an important issue of air quality management in Hong Kong because ozone formation is generally VOC limited.
L. Cui, Z. Zhang, Y. Huang, S. C. Lee, D. R. Blake, K. F. Ho, B. Wang, Y. Gao, X. M. Wang, P. K. K. Louie   +9 more
doaj   +1 more source

Organic trace gas measurements by PTR‐MS during INDOEX 1999 [PDF]

Journal of Geophysical Research: Atmospheres, 2002
A proton‐transfer‐reaction mass spectrometer (PTR‐MS) was used for fast‐response measurements of volatile organic compounds (VOCs) onboard the NOAA research vessel Ronald H. Brown during leg 2 (4 March–23 March) of the INDOEX 1999 cruise. In this paper, we present a first overview of the distribution of acetonitrile, methanol, acetone, and acetaldehyde
Wisthaler, A., Hansel, A., Dickerson, R., Crutzen, P.   +3 more
openaire   +2 more sources

Measurement report: Important contributions of oxygenated compounds to emissions and chemistry of volatile organic compounds in urban air [PDF]

Atmospheric Chemistry and Physics, 2020
Volatile organic compounds (VOCs) play important roles in the tropospheric atmosphere. In this study, VOCs were measured at an urban site in Guangzhou, one of the megacities in the Pearl River Delta (PRD), using a gas chromatograph–mass spectrometer ...
C. Wu, C. Wu, C. Wang, C. Wang, S. Wang, S. Wang, W. Wang, B. Yuan, B. Yuan, J. Qi, J. Qi, B. Wang, H. Wang, C. Wang, W. Song, X. Wang, W. Hu, S. Lou, C. Ye, Y. Peng, Y. Peng, Z. Wang, Z. Wang, Y. Huangfu, Y. Huangfu, Y. Xie, M. Zhu, J. Zheng, J. Zheng, X. Wang, X. Wang, B. Jiang, B. Jiang, Z. Zhang, Z. Zhang, M. Shao, M. Shao   +36 more
doaj   +1 more source

Identifying volatile in vitro biomarkers for oral bacteria with proton-transfer-reaction mass spectrometry and gas chromatography–mass spectrometry

Scientific Reports, 2021
We have measured the volatile fingerprints of four pathogenic oral bacteria connected to periodontal disease and dental abscess: Porphyromonas gingivalis (three separate strains), Prevotella intermedia, Prevotella nigrescens and Tannerella forsythia ...
Kajsa Roslund, Markku Lehto, Pirkko Pussinen, Kari Hartonen, Per-Henrik Groop, Lauri Halonen, Markus Metsälä   +6 more
doaj   +1 more source

Introducing the extended volatility range proton-transfer-reaction mass spectrometer (EVR PTR-MS)

Atmospheric Measurement Techniques, 2020
. Proton-transfer-reaction mass spectrometry (PTR-MS) is widely used in atmospheric sciences for measuring volatile organic compounds in real time. In the most widely used type of PTR-MS instruments, air is directly introduced into a chemical ionization ...
F. Piel, M. Müller, K. Winkler, Jenny Skytte af Sätra, A. Wisthaler   +4 more
semanticscholar   +1 more source

Antifungal activity of Streptomyces spp. against Pyrenophora tritici-repentis the causal agent of tan spot in wheat [PDF]

Journal of Plant Protection Research, 2023
Tan spot, caused by Pyrenophora tritici-repentis (Ptr), is a worrisome destructive foliar disease of wheat-growing areas around the world. Streptomyces spp.
Priscila Monteiro Pereira, Flávio Martins Santana, Alexsandro Dallegrave, Sueli Teresinha Van Der Sand   +3 more
doaj   +1 more source

Dataset of volatile compounds in fresh and stored cut watermelon (Citrullus lanatus) under varying processing and packaging conditions

Data in Brief, 2019
Headspace volatile data for fresh and stored cut watermelon measured by solid phase microextraction gas chromatography - mass spectrometry (SPME GC-MS) and also proton transfer reaction-mass spectrometry (PTR-MS) are reported [1].
Michelle Louise Mendoza-Enano, Roger Stanley, Damian Frank   +2 more
doaj   +1 more source