keyword
MENU ▼
Read by QxMD icon Read
search

Volatile organic compounds

keyword
https://www.readbyqxmd.com/read/29352640/recent-advancements-in-bioremediation-of-dye-current-status-and-challenges
#1
REVIEW
Kumar Vikrant, Balendu Shekhar Giri, Nadeem Raza, Kangkan Roy, Ki-Hyun Kim, Birendra Nath Rai, Ram Sharan Singh
The rampant industrialization and unchecked growth of modern textile production facilities coupled with the lack of proper treatment facilities have proliferated the discharge of effluents enriched with toxic, baleful, and carcinogenic pollutants including dyes, heavy metals, volatile organic compounds, odorants, and other hazardous materials. Therefore, the development of cost-effective and efficient control measures against such pollution is imperative to safeguard ecosystems and natural resources. In this regard, recent advances in biotechnology and microbiology have propelled bioremediation as a prospective alternative to traditional treatment methods...
January 8, 2018: Bioresource Technology
https://www.readbyqxmd.com/read/29346294/gc-ms-analysis-of-the-volatile-constituents-in-the-leaves-of-14-compositae-plants
#2
Yiguang Wang, Xiran Li, Qinjie Jiang, Hainan Sun, Jiafu Jiang, Sumei Chen, Zhiyong Guan, Weimin Fang, Fadi Chen
The green organs, especially the leaves, of many Compositae plants possess characteristic aromas. To exploit the utility value of these germplasm resources, the constituents, mainly volatile compounds, in the leaves of 14 scented plant materials were qualitatively and quantitatively compared via gas chromatography-mass spectrometry (GC-MS). A total of 213 constituents were detected and tentatively identified in the leaf extracts, and terpenoids (especially monoterpene and sesquiterpene derivatives), accounting for 40...
January 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29346281/a-prototype-sensor-for-in-situ-sensing-of-fine-particulate-matter-and-volatile-organic-compounds
#3
Chee-Loon Ng, Fuu-Ming Kai, Ming-Hui Tee, Nicholas Tan, Harold F Hemond
Air pollution exposure causes seven million deaths per year, according to the World Health Organization. Possessing knowledge of air quality and sources of air pollution is crucial for managing air pollution and providing early warning so that a swift counteractive response can be carried out. An optical prototype sensor (AtmOptic) capable of scattering and absorbance measurements has been developed to target in situ sensing of fine particulate matter (PM2.5) and volatile organic compounds (VOCs). For particulate matter testing, a test chamber was constructed and the emission of PM2...
January 18, 2018: Sensors
https://www.readbyqxmd.com/read/29342183/identification-of-volatiles-released-by-diapausing-brown-marmorated-stink-bug-halyomorpha-halys-hemiptera-pentatomidae
#4
Laura J Nixon, William R Morrison, Kevin B Rice, Eckehard G Brockerhoff, Tracy C Leskey, Filadelfo Guzman, Ashot Khrimian, Stephen Goldson, Michael Rostás
The brown marmorated stink bug, Halyomorpha halys, is an agricultural and urban pest that has become widely established as an invasive species of major concern in the USA and across Europe. This species forms large aggregations when entering diapause, and it is often these aggregations that are found by officials conducting inspections of internationally shipped freight. Identifying the presence of diapausing aggregations of H. halys using their emissions of volatile organic compounds (VOCs) may be a potential means for detecting and intercepting them during international freight inspections...
2018: PloS One
https://www.readbyqxmd.com/read/29341859/an-indoor-air-quality-evaluation-in-a-residential-retrofit-project-using-spray-polyurethane-foam
#5
Shen Tian, Scott Ecoff, John Sebroski, Jason Miller, Harold Rickenbacker, Melissa Bilec
Understanding of indoor air quality (IAQ) during and after spray polyurethane foam (SPF) application is essential to protect the health of both workers and building occupants. Previous efforts such as field monitoring, micro-chamber/spray booth emission studies and fate/transport modeling have been conducted to understand the chemical exposure of SPF and guide risk mitigation strategies. However, each type of research has its limitation and can only reveal partial information on the relationship between SPF and IAQ...
January 17, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29338642/functional-evolution-of-biosynthetic-enzymes-that-produce-plant-volatiles
#6
Takao Koeduka
Plants synthesize volatile compounds to attract pollinators. The volatiles emitted by flowers are often complex mixtures of organic compounds; pollinators are capable of distinctly recognizing different volatile compounds. Plants also produce volatile compounds to protect themselves against herbivores and pathogens. Some of the volatile compounds produced in floral and vegetative tissues are toxic to insects and microbes. To adapt changes in the environment, plants have evolved the ability to synthesize a unique set of volatiles...
January 17, 2018: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/29338173/a-smartphone-based-voc-sensor-using-colorimetric-polydiacetylenes
#7
Dong-Hoon Park, Jung-Moo Heo, Woomin Jeong, Young Hyuk Yoo, Bum Jun Park, Jong-Man Kim
Owing to a unique colorimetric (typically blue-to-red) feature upon environmental stimulation, polydiacetylene (PDAs) have been actively employed in chemosensor systems. We developed a highly accurate and simple volatile organic compound (VOC) sensor system that can be operated using a conventional smartphone. The procedure begins with forming an array of four different PDAs on conventional paper using inkjet printing of four corresponding diacetylenes (DAs) followed by photopolymerization. A database of color changes (i...
January 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29336521/identification-and-quantification-of-vocs-by-proton-transfer-reaction-time-of-flight-mass-spectrometry-an-experimental-workflow-for-the-optimization-of-specificity-sensitivity-and-accuracy
#8
Andrea Romano, George B Hanna
Proton Transfer Reaction Time of Flight Mass Spectrometry (PTR-ToF-MS) is a direct injection MS technique, allowing for the sensitive and real-time detection, identification and quantification of volatile organic compounds (VOCs). When aiming to employ PTR-ToF-MS for targeted VOC analysis some methodological questions must be addressed, such as the need to correctly identify product ions, or evaluating the quantitation accuracy. This work proposes a workflow for PTR-ToF-MS method development, addressing the main issues affecting the reliable identification and quantification of target compounds...
January 16, 2018: Journal of Mass Spectrometry: JMS
https://www.readbyqxmd.com/read/29335226/genomic-and-metabolic-characterization-of-spoilage-associated-pseudomonas-species
#9
Tamsyn Stanborough, Narelle Fegan, Shane M Powell, Tanoj Singh, Mark Tamplin, P Scott Chandry
Pseudomonas are common spoilage agents of aerobically stored fresh foods. Their ability to cause spoilage is species- and may be strain-specific. To improve our understanding of the meat and milk spoilage agents Pseudomonas fragi and Pseudomonas lundensis, we sequenced the genomes of 12 P. fragi and seven P. lundensis isolates. These genomes provided a dataset for genomic analyses. Key volatile organic compounds (VOCs) produced or metabolised by the isolates were determined during their growth on a beef paste and where possible, metabolic activity was associated with gene repertoire...
January 5, 2018: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/29333991/evaluation-of-a-portable-gas-chromatograph-with-photoionization-detector-under-variations-of-voc-concentration-temperature-and-relative-humidity
#10
Jhy-Charm Soo, Eun Gyung Lee, Ryan F LeBouf, Michael L Kashon, William Chisholm, Martin Harper
The objective of this present study was to evaluate the performance of a portable gas chromatograph ─ photoionization detector (GC-PID), under various test conditions to determine if it could be used in occupational settings. A mixture of seven volatile organic compounds (VOCs) - acetone, ethylbenzene, methyl isobutyl ketone, toluene, m-xylene, p-xylene, and o-xylene - was selected because its components are commonly present in paint manufacturing industries. A full-factorial combination of four concentration levels (exposure scenarios) of VOC mixtures, three different temperatures (25˚C, 30˚C, and 35˚C), and three relative humidities (RHs; 25%, 50%, and 75%) was conducted in a full- size controlled environmental chamber...
January 15, 2018: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/29331893/ambient-volatile-organic-compounds-vocs-in-communities-of-the-athabasca-oil-sands-region-sources-and-screening-health-risk-assessment
#11
Md Aynul Bari, Warren B Kindzierski
An investigation of ambient levels and sources of volatile organic compounds (VOCs) and associated public health risks was carried out at two northern Alberta oil sands communities (Fort McKay and Fort McMurray located < 25 km and >30 km from oil sands development, respectively) for the period January 2010-March 2015. Levels of total detected VOCs were comparatively similar at both communities (Fort McKay: geometric mean = 22.8 μg/m3, interquartile range, IQR = 13.8-41 μg/m3); (Fort McMurray: geometric mean = 23...
January 11, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29331811/volatile-organic-compounds-vocs-removal-in-non-thermal-plasma-double-dielectric-barrier-discharge-reactor
#12
Muhammad Farooq Mustafa, Xindi Fu, Yanjun Liu, Yawar Abbas, Hongtao Wang, Wenjing Lu
Non-thermal plasma (NTP) an emerging technology to treat volatile organic compounds (VOCs) present in unhygienic point source air streams. In present study, double dielectric barrier discharge (DDBD) reactors were used for the first time to evaluate the removal efficiency of VOCs mixture of different nature at constant experimental conditions (input power 16-65.8 W, VOCs mixture feeding rate 1-6 L/min, 100-101 ppm inlet concentration of individual VOC). Reactor A and B with discharge gap at 6 mm and 3 mm respectively, were used in current study...
January 9, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29331219/polycyclic-aromatic-hydrocarbons-in-soils-and-lichen-from-the-western-tibetan-plateau-concentration-profiles-distribution-and-its-influencing-factors
#13
Ruichen Zhou, Ruiqiang Yang, Chuanyong Jing
The Tibetan Plateau (TP) is a huge area and rarely affected by human activity, and is regarded as one of the most remote regions on the earth. Many studies about the long-range atmospheric transport (LRAT) of semi-volatile organic compounds (SVOCs) were conducted in southern and central TP. However, there are very limited studies focused on PAHs in the western TP and the concentrations profiles, distribution and its controlling factors in this area remains unclear. Thus, to explore this knowledge gap, 37 surface soil samples and 23 lichen samples were collected and analyzed for PAHs...
January 10, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29330538/flux-of-the-biogenic-volatiles-isoprene-and-dimethyl-sulfide-from-an-oligotrophic-lake
#14
Michael Steinke, Bettina Hodapp, Rameez Subhan, Thomas G Bell, Dominik Martin-Creuzburg
Biogenic volatile organic compounds (BVOCs) affect atmospheric chemistry, climate and regional air quality in terrestrial and marine atmospheres. Although isoprene is a major BVOC produced in vascular plants, and marine phototrophs release dimethyl sulfide (DMS), lakes have been widely ignored for their production. Here we demonstrate that oligotrophic Lake Constance, a model for north temperate deep lakes, emits both volatiles to the atmosphere. Depth profiles indicated that highest concentrations of isoprene and DMS were associated with the chlorophyll maximum, suggesting that their production is closely linked to phototrophic processes...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29327928/one-step-bioconversion-of-fatty-acids-into-c8-c9-volatile-aroma-compounds-by-a-multifunctional-lipoxygenase-cloned-from-pyropia-haitanensis
#15
Zhu-Jun Zhu, Hai-Min Chen, Juanjuan Chen, Rui Yang, Xiao-Jun Yan
The multifunctional lipoxygenase PhLOX cloned from Pyropia haitanensis was expressed in E. coli with 24.4 mg•L-1 yield. PhLOX could catalyze the one-step bioconversion of C18-C22 fatty acids into C8-C9 volatile organic compounds (VOCs), displaying higher catalytic efficiency for eicosenoic and docosenoic acids than for octadecenoic acids. C20:5 was the most suitable substrate among the tested fatty acids. The C8-C9 VOCs were generated in good yields from fatty acids, e.g., 2E-nonenal from C20:4, and 2E,6Z-nonadienal from C20:5...
January 12, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29324971/response-to-cherrie-how-to-quantitatively-assess-dermal-exposure-to-volatile-organic-compounds
#16
Jeroen A J Vanoirbeek, Matteo Creta, Katrien Poels, Lode Godderis, Radu-Corneliu Duca
No abstract text is available yet for this article.
January 6, 2018: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29324768/identifying-human-diamine-sensors-for-death-related-putrescine-and-cadaverine-molecules
#17
Cristina Izquierdo, José C Gómez-Tamayo, Jean-Christophe Nebel, Leonardo Pardo, Angel Gonzalez
Pungent chemical compounds originating from decaying tissue are strong drivers of animal behavior. Two of the best-characterized death smell components are putrescine (PUT) and cadaverine (CAD), foul-smelling molecules produced by decarboxylation of amino acids during decomposition. These volatile polyamines act as 'necromones', triggering avoidance or attractive responses, which are fundamental for the survival of a wide range of species. The few studies that have attempted to identify the cognate receptors for these molecules have suggested the involvement of the seven-helix trace amine-associated receptors (TAARs), localized in the olfactory epithelium...
January 11, 2018: PLoS Computational Biology
https://www.readbyqxmd.com/read/29323216/characterization-of-isoprene-derived-secondary-organic-aerosols-at-a-rural-site-in-north-china-plain-with-implications-for-anthropogenic-pollution-effects
#18
Jianjun Li, Gehui Wang, Can Wu, Cong Cao, Yanqin Ren, Jiayuan Wang, Jin Li, Junji Cao, Limin Zeng, Tong Zhu
Isoprene is the most abundant non-methane volatile organic compound (VOC) and the largest contributor to secondary organic aerosol (SOA) burden on a global scale. In order to examine the influence of high concentrations of anthropogenic pollutants on isoprene-derived SOA (SOA i ) formation, summertime PM2.5 filter samples were collected with a three-hour sampling interval at a rural site in the North China Plain (NCP), and determined for SOA i tracers and other chemical species. RO2+NO pathway derived 2-methylglyceric acid presented a relatively higher contribution to the SOA i due to the high-NOx (~20 ppb) conditions in the NCP that suppressed the reactive uptake of RO2+HO2 reaction derived isoprene epoxydiols...
January 11, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29323116/impact-on-short-lived-climate-forcers-increases-projected-warming-due-to-deforestation
#19
C E Scott, S A Monks, D V Spracklen, S R Arnold, P M Forster, A Rap, M Äijälä, P Artaxo, K S Carslaw, M P Chipperfield, M Ehn, S Gilardoni, L Heikkinen, M Kulmala, T Petäjä, C L S Reddington, L V Rizzo, E Swietlicki, E Vignati, C Wilson
The climate impact of deforestation depends on the relative strength of several biogeochemical and biogeophysical effects. In addition to affecting the exchange of carbon dioxide (CO2) and moisture with the atmosphere and surface albedo, vegetation emits biogenic volatile organic compounds (BVOCs) that alter the formation of short-lived climate forcers (SLCFs), which include aerosol, ozone and methane. Here we show that a scenario of complete global deforestation results in a net positive radiative forcing (RF; 0...
January 11, 2018: Nature Communications
https://www.readbyqxmd.com/read/29319815/chemical-analysis-and-simulated-pyrolysis-of-tobacco-heating-system-2-2-compared-to-conventional-cigarettes
#20
Xiangyu Li, Yanbo Luo, Xingyi Jiang, Hongfei Zhang, Fengpeng Zhu, Shaodong Hu, Hongwei Hou, Qingyuan Hu, Yongqiang Pang
Introduction: Tobacco Heating System 2.2 (THS 2.2, marketed as iQOS), is a heat-not-burn (HNB) tobacco product that has been successfully introduced to global markets. Despite its expanding market, few independent and systematic researches into THS 2.2 have been carried out to date. Methods: We tested a comprehensive list of total particulate matter (TPM), water, tar, nicotine, propylene glycol, glycerin, carbon monoxide, volatile organic compounds, aromatic amines, hydrogen cyanide, ammonia, N-nitrosamines, phenol, and polycyclic aromatic hydrocarbon under both ISO and HCI regimes...
January 8, 2018: Nicotine & Tobacco Research: Official Journal of the Society for Research on Nicotine and Tobacco
keyword
keyword
43418
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"