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https://www.readbyqxmd.com/read/28102830/can-exhaled-volatile-organic-compounds-predict-asthma-exacerbations-in-children
#1
Dillys van Vliet, Agnieszka Smolinska, Quirijn Jöbsis, Jean Muris, Philippe Rosias, Jan Dallinga, Edward Dompeling, Frederik van Schooten
Background Asthma control falls short of current goals of asthma management guidelines. Non-invasive monitoring of airway inflammation may help to improve the level of asthma control in children. Aim 1) To identify a set of exhaled volatile organic compounds (VOCs) that is most predictive for an asthma exacerbation in children. 2) To determine the chemical background of predictive VOCs. Methods In an one-year prospective observational study, 96 asthmatic children were studied . At clinical visits with an interval of 2 months, asthma control, fractional exhaled nitric oxide, lung function (FEV1, FEV1/VC) and VOCs in exhaled breath were determined by means of gas chromatography time-of-flight mass spectrometry...
January 19, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28099012/aqueous-photochemistry-of-secondary-organic-aerosol-of-%C3%AE-pinene-and-%C3%AE-humulene-oxidized-with-ozone-hydroxyl-radical-and-nitrate-radical
#2
Dian E Romonosky, Ying Li, Manabu Shiraiwa, Alexander Laskin, Julia Laskin, Sergey A Nizkorodov
Formation of secondary organic aerosols (SOA) from biogenic volatile organic compounds (BVOC) occurs via O3- and OH-initiated reactions during the day and reactions with NO3 during the night. We explored the effect of these three oxidation conditions on the molecular composition and aqueous photochemistry of model SOA prepared from two common BVOC. A common monoterpene, α-pinene, and sesquiterpene, α-humulene, were used to form SOA in a smog chamber via BVOC + O3, BVOC + NO3, and BVOC + OH + NOx oxidation...
January 18, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28091587/bacillus-volatiles-adversely-affect-the-physiology-and-ultra-structure-of-ralstonia-solanacearum-and-induce-systemic-resistance-in-tobacco-against-bacterial-wilt
#3
Hafiz Abdul Samad Tahir, Qin Gu, Huijun Wu, Yuedi Niu, Rong Huo, Xuewen Gao
Volatile organic compounds (VOCs) produced by various bacteria have significant potential to enhance plant growth and to control phytopathogens. Six of the most effective antagonistic Bacillus spp. were used in this study against Ralstonia solanacearum (Rsc) TBBS1, the causal agent of bacterial wilt disease in tobacco. Bacillus amyloliquefaciens FZB42 and Bacillus artrophaeus LSSC22 had the strongest inhibitory effect against Rsc. Thirteen VOCs produced by FZB42 and 10 by LSSC22 were identified using gas chromatography-mass spectrometry analysis...
January 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28090133/impacts-of-changes-of-indoor-air-pressure-and-air-exchange-rate-in-vapor-intrusion-scenarios
#4
Rui Shen, Eric M Suuberg
There has, in recent years, been increasing interest in understanding the transport processes of relevance in vapor intrusion of volatile organic compounds (VOCs) into buildings on contaminated sites. These studies have included fate and transport modeling. Most such models have simplified the prediction of indoor air contaminant vapor concentrations by employing a steady state assumption, which often results in difficulties in reconciling these results with field measurements. This paper focuses on two major factors that may be subject to significant transients in vapor intrusion situations, including the indoor air pressure and the air exchange rate in the subject building...
February 1, 2016: Building and Environment
https://www.readbyqxmd.com/read/28089301/time-since-discharge-of-9mm-cartridges-by-headspace-analysis-part-2-ageing-study-and-estimation-of-the-time-since-discharge-using-multivariate-regression
#5
M Gallidabino, F S Romolo, C Weyermann
Estimating the time since discharge of spent cartridges can be a valuable tool in the forensic investigation of firearm-related crimes. To reach this aim, it was previously proposed that the decrease of volatile organic compounds released during discharge is monitored over time using non-destructive headspace extraction techniques. While promising results were obtained for large-calibre cartridges (e.g., shotgun shells), handgun calibres yielded unsatisfying results. In addition to the natural complexity of the specimen itself, these can also be attributed to some selective choices in the methods development...
December 27, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28089297/time-since-discharge-of-9mm-cartridges-by-headspace-analysis-part-1-comprehensive-optimisation-and-validation-of-a-headspace-sorptive-extraction-hsse-method
#6
M Gallidabino, F S Romolo, C Weyermann
Estimating the time since discharge of spent cartridges can be a valuable tool in the forensic investigation of firearm-related crimes. To reach this aim, it was previously proposed that the decrease of volatile organic compounds released during discharge is monitored over time using non-destructive headspace extraction techniques. While promising results were obtained for large-calibre cartridges (e.g., shotgun shells), handgun calibres yielded unsatisfying results. In addition to the natural complexity of the specimen itself, these can also be attributed to some selective choices in the methods development...
December 24, 2016: Forensic Science International
https://www.readbyqxmd.com/read/28078425/odorant-receptors-and-antennal-lobe-morphology-offer-a-new-approach-to-understanding-olfaction-in-the-asian-longhorned-beetle
#7
Robert F Mitchell, Loyal P Hall, Peter F Reagel, Duane D McKenna, Thomas C Baker, John G Hildebrand
The Asian longhorned beetle Anoplophora glabripennis (Motchulsky) is an exotic forest pest that has repeatedly invaded North America and Europe from Asia, and has the potential to kill millions of trees and cause billions of dollars in damage. Traps baited with an attractive mixture of volatile organic compounds from hosts have been of limited success in monitoring invasion sites. We propose that lures might be improved through studying the olfactory system of adult beetles, especially the gene family of odorant receptors (ORs) and the structure of the antennal lobes of the brain...
January 11, 2017: Journal of Comparative Physiology. A, Neuroethology, Sensory, Neural, and Behavioral Physiology
https://www.readbyqxmd.com/read/28078414/application-of-hs-spme-gc-ms-method-for-the-detection-of-active-moulds-on-historical-parchment
#8
Tomasz Sawoszczuk, Justyna Syguła-Cholewińska, Julio M Del Hoyo-Meléndez
The goal of this work was to analyse the profile of microbial volatile organic compounds (MVOCs) emitted by moulds growing on parchment samples, in search of particular volatiles mentioned in the literature as indicators of active mould growth. First, the growth of various moulds on samples of parchment was assessed. Those species that showed collagenolytic activity were then inoculated on two types of media: samples of parchment placed on media and on media containing amino acids that are elements of the structure of collagen...
January 11, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28078400/characterization-of-four-endophytic-fungi-as-potential-consolidated-bioprocessing-hosts-for-conversion-of-lignocellulose-into-advanced-biofuels
#9
Weihua Wu, Ryan W Davis, Mary Bao Tran-Gyamfi, Alan Kuo, Kurt LaButti, Sirma Mihaltcheva, Hope Hundley, Mansi Chovatia, Erika Lindquist, Kerrie Barry, Igor V Grigoriev, Bernard Henrissat, John M Gladden
Recently, several endophytic fungi have been demonstrated to produce volatile organic compounds (VOCs) with properties similar to fossil fuels, called "mycodiesel," while growing on lignocellulosic plant and agricultural residues. The fact that endophytes are plant symbionts suggests that some may be able to produce lignocellulolytic enzymes, making them capable of both deconstructing lignocellulose and converting it into mycodiesel, two properties that indicate that these strains may be useful consolidated bioprocessing (CBP) hosts for the biofuel production...
January 12, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28077775/dung-odours-signal-sex-age-territorial-and-oestrous-state-in-white-rhinos
#10
Courtney Marneweck, Andreas Jürgens, Adrian M Shrader
Mammals commonly communicate olfactorily via urine. However, the extent to which they communicate via dung, another waste product, is unknown. Behavioural studies suggest that mammals can obtain information from dung odours but are unclear about the information transmitted. Moreover, an understanding of the volatile organic compounds (VOCs) released from dung is limited. To address this, we analysed the odours emitted from the dung of free-ranging white rhinos, and found that 2,3-dimethylundecane signalled an individual's sex, heptanal discriminated age class, nonane defined male territorial status and 2,6-dimethylundecane indicated female oestrous state...
January 11, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28077760/effective-delivery-of-volatile-biocides-employing-mesoporous-silicates-for-treating-biofilms
#11
Andrea C Chan, Marimar Bravo Cadena, Helen E Townley, Mark D Fricker, Ian P Thompson
Nanoparticulate delivery of biocides has the potential to decrease levels of exposure to non-target organisms, and miminize long-term exposure that can promote the development of resistance. Silica nanoparticles are an ideal vehicle since they are inert, biocompatible, biodegradable, and thermally and chemically stable. Encapsulation of biocides within nanoparticulates can improve their stability and longevity and maximize the biocidal potential of hydrophobic volatile compounds. Herein, we have shown that the plant secondary metabolites allyl isothiocyanate and cinnamaldehyde demonstrated increased antimicrobial activity against Escherichia coli in planktonic form, when packaged into mesoporous silica nanoparticles...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28074509/editorial-volatile-organic-compounds-in-irritable-bowel-syndrome-technology-for-an-accurate-and-reliable-point-of-care-test
#12
EDITORIAL
R Sood, A C Ford
No abstract text is available yet for this article.
February 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28073471/biochemistry-and-genetics-of-taste-and-odor-producing-cyanobacteria
#13
REVIEW
Susan B Watson, Paul Monis, Peter Baker, Steven Giglio
Cyanobacteria are one of the principal sources of volatile organic compounds (VOCs) which cause offensive taste and odor (T&O) in drinking and recreational water, fish, shellfish and other seafood. Although non-toxic to humans, these T&O compounds severely undermine public trust in these commodities, resulting in substantial costs in treatment, and lost revenue to drinking water, aquaculture, food and beverage and tourist/hospitality industries. Mitigation and control have been hindered by the complexity of the communities and processes which produce and modify T&O events, making it difficult to source-track the major producer(s) and the factors governing VOC production and fate...
April 2016: Harmful Algae
https://www.readbyqxmd.com/read/28070022/stable-isotope-profiles-reveal-active-production-of-vocs-from-human-associated-microbes
#14
Joann Phan, Simone Meinardi, Barbara Barletta, Donald Blake, Katrine Whiteson
Volatile organic compounds (VOCs) measured from exhaled breath have great promise for the diagnosis of bacterial infections. However, determining human or microbial origin of VOCs detected in breath remains a great challenge. For example, the microbial fermentation product 2,3-butanedione was recently found in the breath of CF patients; parallel culture-independent metagenomic sequencing of the same samples revealed that Streptococcus and Rothia spp. have the genetic capacity to produce 2,3-butanedione. To investigate whether the genetic capacity found in metagenomes translates to bacterial production of a VOC of interest such as 2,3-butanedione, we fed stable isotopes to three bacterial strains isolated from Cystic Fibrosis (CF) patients: two Gram-positive bacteria, Rothia mucilaginosa and Streptococcus salivarius, and a dominant opportunistic Gram-negative pathogen, Pseudomonas aeruginosa...
January 10, 2017: Journal of Breath Research
https://www.readbyqxmd.com/read/28068588/evaluation-of-muscodor-cinnamomi-as-an-egg-biofumigant-for-the-reduction-of-microorganisms-on-eggshell-surfaces-and-its-effect-on-egg-quality
#15
Nakarin Suwannarach, Chariya Kaewyana, Arpaporn Yodmeeklin, Jaturong Kumla, Kenji Matsui, Saisamorn Lumyong
The presence of microorganisms on the eggshell surface is a factor of consideration in determining egg quality. These microorganisms can contribute to egg spoilage and can infect the egg. In this study, 18 morphotypes of microorganisms were isolated from eggshells. Morphological, biochemical, physiological and molecular analyses were used to identify these morphotypes into 7 species; Bacillus drentensis, Staphylococcus arlettae, Stap. cohnii, Stap. kloosii, Stap. saprophyticus, Stap. sciuri and Stap. xylosus...
December 28, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28067643/biological-phosphorus-removal-in-anoxic-aerobic-sequencing-batch-reactor-with-starch-as-sole-carbon-source
#16
Dacheng Luo, Linjiang Yuan, Lun Liu, Lu Chai, Xin Wang
In traditional biological phosphorus removal (BPR), phosphorus release in anaerobic stage is the prerequisite of phosphorus excessive uptake in aerobic conditions. Moreover, when low molecular weight of the organic substance such as volatile fatty acids (VFAs) is scarce in bulk liquid or anaerobic condition does not exist, phosphate accumulating organisms (PAOs) have difficulty removing phosphorus. However, in this work, phosphorus removal in two anoxic-aerobic sequencing batch reactors (SBRs) was observed when starch was supplied as a sole carbon source...
January 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28064192/leaf-anatomy-bvoc-emission-and-co2-exchange-of-arctic-plants-following-snow-addition-and-summer-warming
#17
Michelle Schollert, Minna Kivimäenpää, Anders Michelsen, Daan Blok, Riikka Rinnan
BACKGROUND AND AIMS: Climate change in the Arctic is projected to increase temperature, precipitation and snowfall. This may alter leaf anatomy and gas exchange either directly or indirectly. Our aim was to assess whether increased snow depth and warming modify leaf anatomy and affect biogenic volatile organic compound (BVOC) emissions and CO2 exchange of the widespread arctic shrubs Betula nana and Empetrum nigrum ssp. hermaphroditum METHODS: Measurements were conducted in a full-factorial field experiment in Central West Greenland, with passive summer warming by open-top chambers and snow addition using snow fences...
January 7, 2017: Annals of Botany
https://www.readbyqxmd.com/read/28063579/classification-of-nine-malathion-emulsion-samples-by-using-carbon-isotope-ratios-and-the-ratio-of-organic-solvents
#18
Nana Suto, Hiroto Kawashima
The compound specific isotope analysis is nowadays an important and powerful tool in geochemical, environmental and forensics field. On November 2013, Aqli Foods Corporation in Japan dealt with complaints about stench from frozen foods produced. Subsequently, very high concentrations of organophosphorus pesticide as malathion, ethylbenzene and xylene were detected in recovered frozen foods. In particular case, we present the method to measure the stable carbon isotope ratio (δ(13)C) of nine malathion emulsion pesticides using gas chromatography/isotope ratio mass spectrometry (GC/IRMS) to identify the source...
January 2017: Science & Justice: Journal of the Forensic Science Society
https://www.readbyqxmd.com/read/28059241/binary-coded-identification-of-industrial-chemical-vapors-with-an-optofluidic-nose
#19
Abubakar Isa Adamu, Fahri Emre Ozturk, Mehmet Bayindir
An artificial nose system for the recognition and classification of gas-phase analytes and its application in identifying common industrial gases is reported. The sensing mechanism of the device comprises the measurement of infrared absorption of volatile analytes inside the hollow cores of optofluidic Bragg fibers. An array of six fibers is used, where each fiber targets a different region of the mid-infrared in the range of 2-14 μm with transmission bandwidths of about 1-3 μm. The quenching in the transmission of each fiber due to the presence of analyte molecules in the hollow core is measured separately and the cross response of the array allows the identification of virtually any volatile organic compound (VOC)...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28054980/an-integrated-microfabricated-chip-with-double-functions-as-an-ion-source-and-air-pump-based-on-liga-technology
#20
Hua Li, Linxiu Jiang, Chaoqun Guo, Jianmin Zhu, Yongrong Jiang, Zhencheng Chen
The injection and ionization of volatile organic compounds (VOA) by an integrated chip is experimentally analyzed in this paper. The integrated chip consists of a needle-to-cylinder electrode mounting on the Polymethyl Methacrylate (PMMA) substrate. The needle-to-cylinder electrode is designed and fabricated by Lithographie, Galvanoformung and Abformung (LIGA) technology. In this paper, the needle is connected to a negative power supply of -5 kV and used as the cathode; the cylinder electrodes are composed of two arrays of cylinders and serve as the anode...
January 4, 2017: Sensors
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