keyword
MENU ▼
Read by QxMD icon Read
search

volatile organic compound

keyword
https://www.readbyqxmd.com/read/29145162/biomonitoring-based-exposure-assessment-of-benzene-toluene-ethylbenzene-and-xylene-among-workers-at-petroleum-distribution-facilities
#1
Behzad Heibati, Krystal J Godri Pollitt, Jamshid Yazdani Charati, Alan Ducatman, Mohammad Shokrzadeh, Ali Karimi, Mahmoud Mohammadyan
Elevated emissions of volatile organic compounds, including benzene, toluene, ethylbenzene, and o, p, and m-xylenes (BTEX), are an occupational health concern at oil transfer stations. This exploratory study investigated personal exposure to BTEX through environmental air and urine samples collected from 50 male workers at a major oil distribution company in Iran. Airborne BTEX exposures were evaluated over 8h periods during work-shift by using personal passive samplers. Urinary BTEX levels were determined using solid-phase microextraction with gas chromatography mass spectrometry for separation and detection...
November 13, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29144986/decadal-changes-in-emissions-of-volatile-organic-compounds-vocs-from-on-road-vehicles-with-intensified-automobile-pollution-control-case-study-in-a-busy-urban-tunnel-in-south-china
#2
Yanli Zhang, Weiqiang Yang, Isobel Simpson, Xinyu Huang, Jianzhen Yu, Zhonghui Huang, Zhaoyi Wang, Zhou Zhang, Di Liu, Zuzhao Huang, Yujun Wang, Chenglei Pei, Min Shao, Donald R Blake, Junyu Zheng, Zhijiong Huang, Xinming Wang
In the efforts at controlling automobile emissions, it is important to know in what extent air pollutants from on-road vehicles could be truly reduced. In 2014 we conducted tests in a heavily trafficked tunnel in south China to characterize emissions of volatile organic compounds (VOC) from on-road vehicle fleet and compared our results with those obtained in the same tunnel in 2004. Alkanes, aromatics, and alkenes had average emission factors (EFs) of 338, 63, and 42 mg km(-1) in 2014 against that of 194, 129, and 160 mg km(-1) in 2004, respectively...
November 13, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29144301/contamination-levels-and-potential-sources-of-organic-pollution-in-an-asian-river
#3
Chitsan Lin, Kim Anh Nguyen, Chi Thanh Vu, Delia Senoro, Maria Ching Villanueva
The Houjing River has long been an environmental victim of economic development. Industries that have settled along the bank of this river may have largely contributed to severe organic wastes pollution. This study collected water and sediment samples at various points along the river and measured concentrations of 61 volatile organic compounds (VOCs) and 128 semi-volatile organic compounds (SVOCs) for a period of 16 months (Feb 2014-June 2015). Our analyses show that elevated levels of VOCs were observed near two industrial areas, Dashe and Renwu industrial parks...
November 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/29144134/haloarene-linked-unsymmetrically-substituted-triarylethenes-small-aiegens-to-detect-nitroaromatics-and-volatile-organic-compounds
#4
Moghal Zubair Khalid Baig, Prabhat Kumar Sahu, Moloy Sarkar, Manab Chakravarty
Unsymmetrically substituted triarylalkenes as aggregation-induced emission-active fluorogens (AIEgens) are sporadically explored by different researchers. In this paper, naphthalene, biphenyl and haloarene-linked new triarylethenes are conveniently synthesized and presented as unsymmetrically substituted extensive π-conjugates to continue the discovery of small molecules as new AIEgens. Moreover, fluorophores attached to haloarenes are noteworthy but such compounds are barely investigated as AIEgens. The possible mechanism underlying this AIE-behavior has also been addressed by the support of experimental/theoretical outcomes...
November 16, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/29143149/effects-of-intraspecific-and-intra-individual-differences-in-plant-quality-on-preference-and-performance-of-monophagous-aphid-species
#5
Ruth Jakobs, Caroline Müller
Plant chemistry is one of the main drivers of herbivore distribution. Monophagous herbivore species are highly specialized, but even within their only host species the chemistry varies. The herbivore's choice is initially mainly guided by volatile plant compounds. Once on the plant, particularly for aphids the phloem quality affects their performance. However, little is known about the intraspecific and intra-individual variation in phloem sap and their influences on monophagous aphids. To determine potential mechanisms involved in aphid colonization, we tested the effects of intraspecific chemical variation in Tanacetum vulgare, which produces different chemotypes, on the preference of two monophagous aphid species...
November 15, 2017: Oecologia
https://www.readbyqxmd.com/read/29142292/urinary-volatile-organic-compounds-in-overweight-compared-to-normal-weight-children-results-from-the-italian-i-family-cohort
#6
Rosaria Cozzolino, Beatrice De Giulio, Pasquale Marena, Antonella Martignetti, Kathrin Günther, Fabio Lauria, Paola Russo, Matteo Stocchero, Alfonso Siani
Accumulating evidence shows that urinary volatile organic compounds (VOCs) could be perturbed in many physiological and pathological states, including several diseases and different dietary exposures. Few studies investigated the urinary metabolic signature associated to excess body weight and obesity in adult populations, while a different VOCs profile was found in exhaled breath in obese as compared to lean children. Aim of this study was to evaluate the VOCs profile in the urine of 21 overweight/obese (OW/Ob) and 28 normal-weight (NW) children belonging to the Italian cohort of the I...
November 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29141132/intra-species-volatile-interactions-affects-growth-rates-and-exometabolomes-in-aspergillus-oryzae-kccm-60345
#7
Digar Singh, Choong Hwan Lee
The volatile organic compounds (VOCs) are increasingly been recognized as the chemical mediators of mold interactions shaping their community dynamic, growth, and metabolism. Herein, we selectively examined the time-correlated (0 D - 11 D) effects of intra-species VOCs mediated interactions (VMI) on Aspergillus oryzae KCCM 60345 (S1), following co-cultivation with partner strain A. oryzae KACC 44967 (S2), in specially designed twin plate assembly. The comparative evaluation of S1VMI (S1 subjected to VMI with S2) and its control (S1con) showed a notable disparity in their radial growth (S1VMI<S1con) at 5 D, protease activity (S1VMI>S1con) at 3-5 D, amylase activity (S1VMI<S1con) at 3-5 D, and antioxidant levels (S1VMI>S1con) at 3 D...
November 15, 2017: Journal of Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29138416/plant-to-plant-communication-triggered-by-systemin-primes-anti-herbivore-resistance-in-tomato
#8
Mariangela Coppola, Pasquale Cascone, Valentina Madonna, Ilaria Di Lelio, Francesco Esposito, Concetta Avitabile, Alessandra Romanelli, Emilio Guerrieri, Alessia Vitiello, Francesco Pennacchio, Rosa Rao, Giandomenico Corrado
Plants actively respond to herbivory by inducing various defense mechanisms in both damaged (locally) and non-damaged tissues (systemically). In addition, it is currently widely accepted that plant-to-plant communication allows specific neighbors to be warned of likely incoming stress (defense priming). Systemin is a plant peptide hormone promoting the systemic response to herbivory in tomato. This 18-aa peptide is also able to induce the release of bioactive Volatile Organic Compounds, thus also promoting the interaction between the tomato and the third trophic level (e...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29137783/probing-the-radical-chemistry-and-the-reaction-zone-during-the-sono-degradation-of-endocrine-disruptor-2-phenoxyethanol-in-water
#9
Zineb Boutamine, Oualid Hamdaoui, Slimane Merouani
Sonochemical degradation at 600 kHz of 2-phenoxyethanol (PhE), an endocrine disrupting compound, was performed in the presence of several organic additives, namely: 2-propanol, Triton X-100 and sucrose, of different volatilities to obtain detailed information on the reaction zone and the oxidation pathway of this priority emerging water contaminate. It was found that sonication at 600 kHz and 120 W completely remove PhE (10 mg L(-1)) from aerated solutions within 100 min of irradiation. Very little removal of PhE (∼7%) and low accumulation of H2O2 took place in the presence of adequate amount of 2-propanol, indicating that reaction with OH radical outside the bubble is the major degradation pathway of PhE...
March 2018: Ultrasonics Sonochemistry
https://www.readbyqxmd.com/read/29137702/review-of-recent-developments-in-determining-volatile-organic-compounds-in-exhaled-breath-as-biomarkers-for-lung-cancer-diagnosis
#10
REVIEW
Jiemin Zhou, Zi-Ao Huang, Ujendra Kumar, David D Y Chen
Lung cancer is the most common cause of cancer deaths, its global incidence is rising, and continuing rises are predicted. The potential to diagnose lung cancers based on the determination of volatile organic compounds (VOCs) in human breath has been attracting increasing attention with the development of new techniques and methodologies. However, despite many reports of VOC profiling in lung cancer patients, little is known about how specific biomarkers relate to the biochemical pathways involved in lung cancer development, and there is still no reliable method for diagnosing lung cancer at the early stages...
December 15, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/29136906/comparison-of-common-components-analysis-with-principal-components-analysis-and-independent-components-analysis-application-to-spme-gc-ms-volatolomic-signatures
#11
Jihéne Bouhlel, Delphine Jouan-Rimbaud Bouveresse, Said Abouelkaram, Elisabeth Baéza, Catherine Jondreville, Angélique Travel, Jérémy Ratel, Erwan Engel, Douglas N Rutledge
The aim of this work is to compare a novel exploratory chemometrics method, Common Components Analysis (CCA), with Principal Components Analysis (PCA) and Independent Components Analysis (ICA). CCA consists in adapting the multi-block statistical method known as Common Components and Specific Weights Analysis (CCSWA or ComDim) by applying it to a single data matrix, with one variable per block. As an application, the three methods were applied to SPME-GC-MS volatolomic signatures of livers in an attempt to reveal volatile organic compounds (VOCs) markers of chicken exposure to different types of micropollutants...
February 1, 2018: Talanta
https://www.readbyqxmd.com/read/29135919/acoustic-sensors-based-on-amino-functionalized-nanoparticles-to-detect-volatile-organic-solvents
#12
Daniel Matatagui, Oleg Kolokoltsev, José Manuel Saniger, Isabel Gràcia, María Jesús Fernández, Jose Luis Fontecha, María Del Carmen Horrillo
Love-wave gas sensors based on surface functionalized iron oxide nanoparticles has been developed in this research. Amino-terminated iron oxide nanoparticles were deposited, by a spin coating technique, onto the surface of Love-wave sensors, as a very reproducible gas-sensing layer. The gases tested were organic solvents, such as butanol, isopropanol, toluene and xylene, for a wide and low concentration range, obtaining great responses, fast response times of a few minutes (the time at which the device produced a signal change equal to 90%), good reproducibilities, and different responses for each detected solvent...
November 14, 2017: Sensors
https://www.readbyqxmd.com/read/29134407/epiphytic-bacteria-alter-floral-scent-emissions
#13
Carola Helletsgruber, Stefan Dötterl, Ulrike Ruprecht, Robert R Junker
Floral scents are key mediators of biotic interactions between flowers and various organisms such as pollinators, antagonistic animals and bacteria. It has been shown that emissions of floral volatiles are influenced by interactions with other organisms at the levels of roots, leaves and flowers. However, it is largely unknown whether and how epiphytic bacteria associated with flowers affect the composition of floral scent. By comparing volatiles of sterile and inoculated plants we found that bacteria may add components, induce or reduce the emission of compounds, and potentially catabolize others...
November 14, 2017: Journal of Chemical Ecology
https://www.readbyqxmd.com/read/29132208/organic-chemical-characterization-and-mass-balance-of-a-hydraulically-fractured-well-from-fracturing-fluid-to-produced-water-over-405-days
#14
James S Rosenblum, E Michael Thurman, Imma Ferrer, George R Aiken, Karl G Linden
A long-term field study (405 days) of a hydraulically fractured well from the Niobrara Formation in the Denver-Julesburg Basin was completed. Characterization of organic chemicals used in hydraulic fracturing and their changes through time, from the pre-injected fracturing fluid to the produced water, was conducted. The characterization consisted of a mass balance by dissolved organic carbon (DOC), volatile organic analysis by gas chromatography/mass spectrometry, and nonvolatile organic analysis by liquid chromatography/mass spectrometry...
November 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/29131978/simultaneous-photodegradation-of-voc-mixture-by-tio2-powders
#15
Marta Stucchi, Federico Galli, Claudia L Bianchi, Carlo Pirola, Daria C Boffito, Franco Biasioli, Valentino Capucci
Volatile and semi volatile organic compounds' concentration have dramatically increased in indoor environments in recent years. UV light promotes titanium dioxide, which oxidises various molecules; however, most of the studies report the degradation of a single VOC. Here, we investigate the photo-oxidation of 17 molecules in mixture to have a realistic test of TiO2 efficacy. We compare P25, a nanometric catalyst, and 1077, a micrometric sample, that poses less health concerns. A proton-transfer-reaction mass spectrometer measured online the concentration of all the pollutants simultaneously...
November 5, 2017: Chemosphere
https://www.readbyqxmd.com/read/29131420/chromatographic-analysis-of-voc-patterns-in-exhaled-breath-from-smokers-and-nonsmokers
#16
Simonetta Capone, Maria Tufariello, Angiola Forleo, Valentina Longo, Lucia Giampietruzzi, Antonio Vincenzo Radogna, Flavio Casino, Pietro Siciliano
Cigarette smoking harms nearly every organ of the body and causes many diseases. The analysis of exhaled breath for exogenous and endogenous Volatile Organic Compounds (VOCs) can provide fundamental information on active smoking and insight into the health damage that smoke is creating. Various exhaled Volatile Organic Compounds (VOCs) have been reported as typical of smoking habit and recent tobacco consumption, but to date, no eligible biomarkers have been identified. Aiming to identify such potential biomarkers, in this pilot study we analysed the chemical patterns of exhaled breath from 26 volunteers divided in groups of nonsmokers and subgroups of smokers sampled at different periods of withdrawal from smoking...
November 13, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29129714/non-invasive-diagnosis-of-pancreatic-cancer-through-detection-of-volatile-organic-compounds-in-urine
#17
Ramesh Arasaradnam, Alfian Wicaksono, Harrison O'Brien, Hemant M Kocher, James A Covington, Tatjana Crnogorac-Jurcevic
No abstract text is available yet for this article.
November 9, 2017: Gastroenterology
https://www.readbyqxmd.com/read/29128825/toluene-and-acetaldehyde-removal-from-air-on-to-graphene-based-adsorbents-with-microsized-pores
#18
Ji Min Kim, Ji Hoon Kim, Chang Yeon Lee, Dong Wook Jerng, Ho Seon Ahn
Volatile organic compound (VOC) gases can cause harm to the human body with exposure over the long term even at very low concentrations (ppmv levels); thus, effective absorbents for VOC gas removal are an important issue. In this study, accordingly, graphene-based adsorbents with microsized pores were used as adsorbents to remove toluene and acetaldehyde gases at low concentrations (30ppm). Sufficient amounts of the adsorbents were prepared for use on filters and were loaded uniformly at 0.1-0.5g on a 50×50mm(2) area, to evaluate their adsorption features with low gas concentrations...
October 19, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29126936/smoking-influences-fecal-volatile-organic-compounds-composition
#19
J de Swart, N van Gaal, D J C Berkhout, T G J de Meij, N K de Boer
No abstract text is available yet for this article.
November 7, 2017: Clinical Gastroenterology and Hepatology
https://www.readbyqxmd.com/read/29125194/amyotrophic-lateral-sclerosis-a-case-report-and-mechanistic-review-of-the-association-with-toluene-and-other-volatile-organic-compounds
#20
Marcia H Ratner, Joe F Jabre, William M Ewing, Mohamed Abou-Donia, L Christine Oliver
Unmasking of latent neurodegenerative disease has been reported following exposure to chemicals that share one or more mechanisms of action in common with those implicated in the specific disease. For example, unmasking of latent Parkinson's disease (PD) has been associated with exposure to anti-dopaminergic agents, while the progression of pre-existing mild cognitive impairment and unmasking of latent Alzheimer's disease has been associated with exposure to general anesthetic agents which promote Aβ protein aggregation...
November 10, 2017: American Journal of Industrial Medicine
keyword
keyword
98459
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"