Browsing by Subject "chemical-composition"
Now showing items 1-14 of 14
-
Advances in characterization of size-resolved organic matter in marine aerosol over the north atlantic
(Wiley-Blackwell, 2004-01-01)Size-segregated marine aerosols were collected at Mace Head Atmospheric Research Station (Ireland) during spring and autumn 2002 corresponding with the phytoplankton bloom periods in the North Atlantic. Strict control of ... -
Antagonistic activity of ocimum sanctum l. essential oil on growth and zearalenone production by fusarium graminearum in maize grains
(Frontiers Media SA, 2015-09-03)The present study was aimed to establish the antagonistic effects of Ocimum sanctum L. essential oil (OSEO) on growth and zearalenone (ZEA) production of Fusarium graminearum. GC-MS chemical profiling of OSEO revealed the ... -
Black carbon aerosol in winter northeastern qinghai–tibetan plateau, china: the source, mixing state and optical property
(Copernicus GmbH, 2015-11-25)Black carbon (BC) aerosol at high altitudes of the Qinghai-Tibetan Plateau has potential effects on the regional climate and hydrological cycle. An intensive measurement campaign was conducted at Qinghai Lake (similar to ... -
Characteristics of organic and elemental carbon in pm2.5 and pm0.25 in indoor and outdoor environments of a middle school: secondary formation of organic carbon and sources identification
(MDPI AG, 2015-03-17)Secondary organic carbon (SOC) formation and its effects on human health require better understanding in Chinese megacities characterized by a severe particulate pollution and robust economic reform. This study investigated ... -
Characterization and seasonal variations of levoglucosan in fine particulate matter in xi’an, china
(Informa UK Limited, 2014-10-20)PM2.5 (particulate matter with an aerodynamic diameter <2.5 mu m) samples (n = 58) collected every sixth day in Xi'an, China, from 5 July 2008 to 27 June 2009 are analyzed for levoglucosan (1,6-anhydro-beta-d-glucopyranose) ... -
Composition of 15–85 nm particles in marine air
(Copernicus GmbH, 2014-11-05)The chemical composition of 15-85 nm diameter particles was measured at Mace Head, Ireland, during May 2011 using the TDCIMS (thermal desorption chemical ionization mass spectrometer). Measurable levels of chloride, sodium, ... -
Determination of alkylamines in atmospheric aerosol particles: a comparison of gas chromatography–mass spectrometry and ion chromatography approaches
(Copernicus GmbH, 2014-07-04)In recent years low molecular weight alkylamines have been recognized to play an important role in particle formation and growth in the lower atmosphere. However, major uncertainties are associated with their atmospheric ... -
Endometrial gene expression in high- and low-fertility heifers in the late luteal phase of the estrous cycle and a comparison with midluteal gene expression
(American Physiological Society, 2016-02-05)Embryonic mortality is a major constraint to improving reproductive efficiency and profitability in livestock enterprises. We previously reported differential expression of genes with identified roles in cellular growth ... -
Novel insights on new particle formation derived from a pan-european observing system
(Springer Nature, 2018-01-24)The formation of new atmospheric particles involves an initial step forming stable clusters less than a nanometre in size (<similar to 1 nm), followed by growth into quasi-stable aerosol particles a few nanometres ... -
Organic aerosol components derived from 25 ams data sets across europe using a consistent me-2 based source apportionment approach
(Copernicus GmbH, 2014-06-23)Organic aerosols (OA) represent one of the major constituents of submicron particulate matter (PM1) and comprise a huge variety of compounds emitted by different sources. Three intensive measurement field campaigns to ... -
Organosulfates in atmospheric aerosol: synthesis and quantitative analysis of pm<sub>2.5</sub> from xi'an, northwestern china
(Copernicus GmbH, 2018-06-18)The sources, formation mechanism and amount of organosulfates (OS) in atmospheric aerosol are not yet well understood, partly due to the lack of authentic standards for quantification. In this study, we report an improved ... -
Structure and conserved characteristics ofcampylobacter jejunilipopolysaccharides
(Oxford University Press (OUP), 1997-12-01)The lipid A component of Campylobacter jejuni lipopolysaccharides (LPSs) contains the same architectural principle as that found in other bacterial species; however, unlike the case with other bacterial species, the lipid ... -
The composition of nucleation and aitken modes particles during coastal nucleation events: evidence for marine secondary organic contribution
(Copernicus GmbH, 2006-10-12)Newly-formed nanometer-sized particles have been observed at coastal and marine environments world wide. Organic species have so far not been detected in those newly-formed nucleation mode particles. In this study, we ... -
Ubiquity of organic nitrates from nighttime chemistry in the european submicron aerosol
(Wiley-Blackwell, 2016-07-28)In the atmosphere nighttime removal of volatile organic compounds is initiated to a large extent by reaction with the nitrate radical (NO3) forming organic nitrates which partition between gas and particulate phase. Here ...