Fant 9747 publikasjoner. Viser side 7 av 390:
2005
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2010
2017
Fungus-farming termites cultivate a Termitomyces fungus monoculture in enclosed gardens (combs) free of other fungi, except during colony declines, where Pseudoxylaria spp. stowaway fungi appear and take over combs. Here, we determined Volatile Organic Compounds (VOCs) of healthy Macrotermes bellicosus nests in nature and VOC changes associated with comb decay during Pseudoxylaria takeover. We identified 443 VOCs and unique volatilomes across samples and nest volatilomes that were mainly composed of fungus comb VOCs with termite contributions. Few comb VOCs were linked to chemical changes during decay, but longipinocarvone and longiverbenone were only emitted during comb decay. These terpenes may be involved in Termitomyces defence against antagonistic fungi or in fungus-termite signalling of comb state. Both comb and Pseudoxylaria biomass volatilomes contained many VOCs with antimicrobial activity that may serve in maintaining healthy Termitomyces monocultures or aid in the antagonistic takeover by Pseudoxylaria during colony decline. We further observed a series of oxylipins with known functions in the regulation of fungus germination, growth, and secondary metabolite production. Our volatilome map of the fungus-farming termite symbiosis provides new insights into the chemistry regulating complex interactions and serves as a valuable guide for future work on the roles of VOCs in symbioses.
John Wiley & Sons
2025
Volatile organic compounds in the museum environment - a PTR-TOF pilot study on canvas samples. NILU F
2013
2013
2006
Volatile and persistent emissions from traffic and power production on Svalbard. VETAPOS. NILU OR
Volatile organic compounds (VOC) including Benzene-Toluene-Xylene (BTX) related compounds were monitored in ambient air samples during Spring (April-Mai) and Autumn (October) 2010 as a follow-up of an earlier BTX ambient air monitoring program in 2007 (Reimann et al 2007) at the Research park in Longyearbyen (Forskningsparken). In addition, BTX related compounds were measured in 18 ¿headspace¿ samples above collected surface soil along snowmobile tracks in Longyeardalen, Adventdalen, Todalen as well as Sassendalen (Fredheim). In addition, during the 2010 VETAPOS in a parallel surface soil sampling campaign 18 samples were analysed for 15 priority PAH compounds.
2011
VOC measurements by PTR-ToF-MS at the Birkenes Observatory. A summary report. NILU OR
Et høy-oppløselig «proton-transfer-reaction time-of-flight» massespektrometer (PTR-ToF-MS) ble brukt til online, sanntids målinger av flyktige organiske forbindelser (VOC) på Birkenes-observatoriet i Sør-Norge. Målingene ble utført i løpet av våren og sommeren 2012, og i januar og begynnelsen av februar 2013. Her presenterer vi standard dataprodukter fra PTR-MS-målingene, slik som volumblandingsforhold av metanol, acetonitril, acetaldehyd, aceton, dimetylsulfid, isopren, metacrolein + metylvinylketon, metyletylketon, benzen, toluen, C8-alkylbenzener, C9-alkylbenzener og summen av monoterpen-isomerer. Forsøksvise data for maursyre, eddiksyre, pinonaldehyd og tre uidentifiserte signaler (m/z 87.080, m/z 89.060 og m/z 101.098) er også rapportert. PT-ToF-MS- massespektrene ble dominert av oksygenerte VOCer både om sommeren og vinteren. De rene hydrokarbonene besto for det meste av aromatiske hydrokarboner (benzen, toluen, C8-alkylbenzener) om vinteren og biogene hydrokarboner (monoterpener og isopren) om sommeren. Sommerdataene bekrefter at Birkenes-observatoriet er et interessant område i den boreo-nemorale vegetasjonssonen hvor det er mulig å observere både utslipp av monoterpener og isopren og deres fotokjemiske omvandling i atmosfæren.
2014
This report documents the EMEP VOC monitoring carried out in 2022. The levels of the measured in 2022 are presented as well as the 2022-status and history of the VOC programme. The geographical pattern of the species in Europe is discussed as well as the long-term trend during the last 20 years.
NILU
2024