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https://www.readbyqxmd.com/read/27911440/the-prey-s-scent-volatile-organic-compound-mediated-interactions-between-soil-bacteria-and-their-protist-predators
#1
Kristin Schulz-Bohm, Stefan Geisen, E R Jasper Wubs, Chunxu Song, Wietse de Boer, Paolina Garbeva
Protists are major predators of bacteria in soils. However, it remains unknown how protists sense their prey in this highly complex environment. Here, we investigated whether volatile organic compounds (VOCs) of six phylogenetic distinct soil bacteria affect the performance of three different soil protists and how that relates to direct feeding interactions. We observed that most bacteria affected protist activity by VOCs. However, the response of protists to the VOCs was strongly dependent on both the bacterial and protist interacting partner...
December 2, 2016: ISME Journal
https://www.readbyqxmd.com/read/27909432/volatile-mediated-effects-predominate-in-paraburkholderia-phytofirmans-growth-promotion-and-salt-stress-tolerance-of-arabidopsis-thaliana
#2
Thomas Ledger, Sandy Rojas, Tania Timmermann, Ignacio Pinedo, María J Poupin, Tatiana Garrido, Pablo Richter, Javier Tamayo, Raúl Donoso
Abiotic stress has a growing impact on plant growth and agricultural activity worldwide. Specific plant growth promoting rhizobacteria have been reported to stimulate growth and tolerance to abiotic stress in plants, and molecular mechanisms like phytohormone synthesis and 1-aminocyclopropane-1-carboxylate deamination are usual candidates proposed to mediate these bacterial effects. Paraburkholderia phytofirmans PsJN is able to promote growth of several plant hosts, and improve their tolerance to chilling, drought and salinity...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27907110/electrospray-ionization-efficiency-is-dependent-on-different-molecular-descriptors-with-respect-to-solvent-ph-and-instrumental-configuration
#3
Andreas Kiontke, Ariana Oliveira-Birkmeier, Andreas Opitz, Claudia Birkemeyer
Over the past decades, electrospray ionization for mass spectrometry (ESI-MS) has become one of the most commonly employed techniques in analytical chemistry, mainly due to its broad applicability to polar and semipolar compounds and the superior selectivity which is achieved in combination with high resolution separation techniques. However, responsiveness of an analytical method also determines its suitability for the quantitation of chemical compounds; and in electrospray ionization for mass spectrometry, it can vary significantly among different analytes with identical solution concentrations...
2016: PloS One
https://www.readbyqxmd.com/read/27905825/saliva-volatile-biomarkers-and-profiles
#4
Maciej Milanowski, Paweł Pomastowski, Tomasz Ligor, Bogusław Buszewski
Saliva is an aqueous fluid found in the oral cavity playing fundamental role in the preservation and maintenance of oral health. Apart from higher-molecular-weight constituents it contains volatile organic compounds (VOCs) that may origin from such sources as blood or be result of bacterial metabolism. They can also reach the oral fluid through dissolving of volatiles from breath and consumed foods. Some of them may serve as biomarkers of various diseases, such as dimethyl disulfide (halitosis), pyridine (periodontal disease) and trimethylamine (trimethylaminuria) or occupational exposure...
December 1, 2016: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/27905399/cellular-reactions-to-long-term-volatile-organic-compound-voc-exposures
#5
Johanna M Gostner, Johannes Zeisler, Mohammad Tauqeer Alam, Peter Gruber, Dietmar Fuchs, Kathrin Becker, Kerstin Neubert, Markus Kleinhappl, Stefan Martini, Florian Überall
Investigations of cellular processes initiated by volatile organic compounds (VOCs) are limited when modelling realistic long-term exposure scenarios at low concentrations. Exposure to indoor VOCs is associated with a range of adverse effects, but data on molecular changes at regulatory threshold limits are lacking. Activity analysis of VOC in vitro can be a valuable complement to inhalation toxicological evaluations. We developed an exposure platform that generates a stable VOC atmosphere and allows the exposure of cells for longer periods...
December 1, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27902490/detection-of-staphylococcus-aureus-in-cystic-fibrosis-patients-using-breath-voc-profiles
#6
A H Neerincx, B P Geurts, J van Loon, V Tiemes, J J Jansen, F J M Harren, L A J Kluijtmans, P J F M Merkus, S M Cristescu, L M C Buydens, R A Wevers
Staphylococcus aureus (S. aureus) is a common bacterium infecting children with cystic fibrosis (CF). Since current detection methods are difficult to perform in children, there is need for an alternative. This proof of concept study investigates whether breath profiles can discriminate between S. aureus infected and non-infected CF patients based on volatile organic compounds (VOCs). We collected exhaled breath of CF patients with and without S. aureus airways infections in which VOCs were identified using gas chromatography-mass spectrometry...
November 30, 2016: Journal of Breath Research
https://www.readbyqxmd.com/read/27901194/seasonal-variation-of-the-essential-oil-from-two-brazilian-native-aldama-la-llave-asteraceae-species
#7
Tuane S DE Oliveira, Aline B Bombo, Adriana S S DE Oliveira, Vera L Garcia, Beatriz Appezzato-DA-Glória
Aldama arenaria and A. robusta are morphologically similar aromatic species that have seasonal development. The yield and chemical composition of essential oils from aerial and underground vegetative organs of these species were compared to verify the production of volatile metabolites in flowering and dormant phases of development and to identify if there are unique compounds for either species. The major compound in the essential oils from A. arenaria leaves was palustrol (16.22%) and for aerial stems was limonene (15...
2016: Anais da Academia Brasileira de Ciências
https://www.readbyqxmd.com/read/27900861/thermal-desorption-combined-with-atmospheric-pressure-photo-ionization-for-the-analysis-of-volatile-compounds-and-its-possible-applications
#8
Yury Kostyukevich, Ludmila Borisova, Alexey Kononikhin, Igor Popov, Eugene Kukaev, Eugene Nikolaev
We report an approach to study volatile organic compounds based on thermal desorption combined with atmospheric pressure photo ionization. The approach allows the sequential evaporation of different fractions of the sample, which simplifies the mass spectrum. We have applied the developed method for the detection of petroleum in vegetable oil. We have shown that in the negative mode, ions of fatty acids corresponding to vegetable oil dominates, while in the positive mode under relatively low temperature the light fraction of petroleum rapidly evaporates making it easy detectable...
2016: European Journal of Mass Spectrometry
https://www.readbyqxmd.com/read/27898321/anaerobic-batch-conversion-of-pine-wood-torrefaction-condensate
#9
Tharaka Rama Krishna C Doddapaneni, Ramasamy Praveenkumar, Henrik Tolvanen, Marja R T Palmroth, Jukka Konttinen, Jukka Rintala
Organic compound rich torrefaction condensate, owing to their high water content and acidic nature, have yet to be exploited for practical application. In this study, microbial conversion of torrefaction condensate from pine wood through anaerobic batch digestion (AD) to produce methane was evaluated. Torrefaction condensate exhibited high methane potentials in the range of 430-492mL/g volatile solids (VS) and 430-460mL/gVS under mesophilic and thermophilic conditions, respectively. Owing to the changes in the composition, the methane yields differed with the torrefaction condensates produced at different temperatures (225, 275 and 300°C), with a maximum of 492±18mL/gVS with the condensate produced at 300°C under mesophilic condition...
November 22, 2016: Bioresource Technology
https://www.readbyqxmd.com/read/27896356/vapochromic-features-of-new-luminogens-based-on-julolidine-containing-styrene-copolymers
#10
Giuseppe Iasilli, Fabio Martini, Pierpaolo Minei, Giacomo Ruggeri, Andrea Pucci
We report on vapochromic films suitable for detecting volatile organic compounds (VOCs), based on new polystyrene copolymers containing julolidine fluorescent molecular rotors (JCAEM). Poly(styrene-co-hydroxyethylmethacrylate) copolymers functionalized with cyanovinyl-julolidine moieties of different compositions were prepared, (P(STY-co-JCAEM)(m) with m = 0.06-0.61). The sensing performance of the spin-coated copolymer films demonstrated significant vapochromism when exposed to VOCs characterized by high vapour pressure and a favourable interaction with the polymer matrix, such as Et2O and CH2Cl2...
November 29, 2016: Faraday Discussions
https://www.readbyqxmd.com/read/27889520/profiling-of-volatile-organic-compounds-released-from-individual-intact-juvenile-and-mature-citrus-leaves
#11
Nabil Killiny, Shelley E Jones
Plants release volatiles to communicate with each other and to attract or repel insects. The methods used to collect volatiles are varied. Here, we describe a simple solvent-less, solid phase microextraction-based method to collect the volatiles released from intact citrus leaves. We were able to collect up to 39 volatiles from both juvenile and mature leaves. Our results indicated that juvenile leaves produced both monoterpenes and sesquiterpenes, and while mature leaves continued to produce a variety of monoterpenes, their release of sesquiterpenes decreased dramatically...
November 12, 2016: Journal of Plant Physiology
https://www.readbyqxmd.com/read/27887825/national-investigation-of-semi-volatile-organic-compounds-pahs-ocps-and-pcbs-in-lake-sediments-of-china-occurrence-spatial-variation-and-risk-assessment
#12
Chaocan Li, Shouliang Huo, Zhiqiang Yu, Beidou Xi, Kevin M Yeager, Zhuoshi He, Chunzi Ma, Jingtian Zhang, Fengchang Wu
In this study, a large scale investigation of semi-volatile organic compounds (SVOCs) in sediments from 52 lakes, located in five geographic regions across China, was conducted to assess sediment quality in terms of organic contaminants. Concentrations of polycyclic aromatic hydrocarbons (PAHs), organochlorine pesticides (OCPs), and polychlorinated biphenyls (PCBs) in sediment were found to range between 17.00-6,633, 0.12-45.24, and 0.03-13.99ngg(-1), respectively. Lake sediments from different regions exhibited variation in contamination levels, and in the compositions of isomers...
November 22, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27887812/chlorobenzene-degeradation-by-non-thermal-plasma-combined-with-eg-tio2-zno-as-a-photocatalyst-effect-of-photocatalyst-on-co2-selectivity-and-byproducts-reduction
#13
Farshid Ghorbani Shahna, Abdulrahman Bahrami, Iraj Alimohammadi, Rassuol Yarahmadi, Babak Jaleh, Mastaneh Gandomi, Hossein Ebrahimi, Kamal Ad-Din Abedi
The non-thermal plasma (NTP) technique, which suffers from low selectivity in complete oxidation of volatile organic compounds to CO2 and H2O, creates unwanted and harmful byproducts. NTP in concert with photocatalyst can resolve this limitation due to additional oxidation. TiO2 and ZnO nanoparticles were coated on the surface of the expanded graphite and placed downstream of the NTP reactor under UV light. In this study, to compare the performance of NTP and the combined system, chlorobenzene removal, selectivity of CO2 and byproducts formation were investigated...
November 9, 2016: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/27886068/effects-of-sampling-conditions-and-environmental-factors-on-fecal-volatile-organic-compound-analysis-by-an-electronic-nose-device
#14
Daniel J C Berkhout, Marc A Benninga, Ruby M van Stein, Paul Brinkman, Hendrik J Niemarkt, Nanne K H de Boer, Tim G J de Meij
Prior to implementation of volatile organic compound (VOC) analysis in clinical practice, substantial challenges, including methodological, biological and analytical difficulties are faced. The aim of this study was to evaluate the influence of several sampling conditions and environmental factors on fecal VOC profiles, analyzed by an electronic nose (eNose). Effects of fecal sample mass, water content, duration of storage at room temperature, fecal sample temperature, number of freeze-thaw cycles and effect of sampling method (rectal swabs vs...
November 23, 2016: Sensors
https://www.readbyqxmd.com/read/27885502/fading-of-wound-induced-volatile-release-during-populus-tremula-leaf-expansion
#15
Miguel Portillo-Estrada, Taras Kazantsev, Ülo Niinemets
The release of stress-driven volatiles throughout leaf development has been little studied. Therefore, we subjected poplar leaves during their developmental stage (from 2 days to 2 weeks old) to wounding by a single punch hole, and measured online the wound-induced volatile organic compound emissions. Our study shows that the emission of certain volatile compounds fades with increasing leaf age. Among these compounds we found lipoxygenase products (LOX products), acetaldehyde, methyl benzoate, methyl salicylate, and mono- and sesquiterpenes...
November 24, 2016: Journal of Plant Research
https://www.readbyqxmd.com/read/27881988/identification-of-a-solanum-pennellii-chromosome-4-fruit-flavor-and-nutritional-quality-associated-metabolite-qtl
#16
Zhongyuan Liu, Saleh Alseekh, Yariv Brotman, Yi Zheng, Zhangjun Fei, Denise M Tieman, James J Giovannoni, Alisdair R Fernie, Harry J Klee
A major resource for tomato quality improvement and gene discovery is the collection of introgression lines (ILs) of cultivated Solanum lycopersicum that contain different, defined chromosomal segments derived from the wild tomato relative, S. pennellii. Among these lines, IL4-4, in which the bottom of S. lycopersicum (cv. M82) chromosome 4 is replaced by the corresponding S. pennellii segment, is altered in many primary and secondary metabolites, including many related to fruit flavor and nutritional quality...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27880857/conformational-flexibility-of-limonene-oxide-studied-by-microwave-spectroscopy
#17
Juan Jesus Lopez Gonzalez, María Mar Quesada-Moreno, Juan Ramón Avilés-Moreno, Thérèse R Huet, M Eugenia Sanz, Donatella Loru, Natasha Jarman
Monoterpenoids are biogenic volatile organic compounds (BVOCs) that play a major role in atmospheric chemistry, participating in the formation of aerosols. In this work, the monoterpenoid R-(+)-limonene oxide (C₁₀H₁₆O) has been characterized in the gas phase by Fourier transform microwave spectroscopy in a supersonic jet. Five conformers of limonene oxide, four equatorial and one axial considering the configuration of the isopropenyl group, have been unambiguously identified from the analysis of the rotational spectrum...
November 23, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/27875502/sniffing-out-paediatric-gastrointestinal-diseases-the-potential-of-volatile-organic-compounds-as-biomarkers-for-disease
#18
Martin Buijck, Daniel J C Berkhout, Evelien F J de Groot, Marc A Benninga, Marc P C van der Schee, Corneille Marie Frank Kneepkens, Nanne K H de Boer, Tim G J de Meij
The diagnostic work-up and follow-up of paediatric functional gastrointestinal disorders and organic conditions usually includes invasive tests, carrying a high burden on patients. There is a place, therefore, for novel, noninvasive disease-specific biomarkers. Volatile organic compounds (VOCs), originating from (patho)physiological metabolic processes in the human body, are excreted as waste products through all conceivable bodily excrements. The spectrum of VOCs harbours a magnificent source of information, with the potential to serve as noninvasive diagnostic biomarkers and to monitor disease activity...
December 2016: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/27874211/characteristics-of-volatile-organic-compounds-produced-from-five-pathogenic-bacteria-by-headspace-solid-phase-micro-extraction-gas-chromatography-mass-spectrometry
#19
Juan Chen, Junni Tang, Hui Shi, Cheng Tang, Rong Zhang
The characteristics of volatile compounds from five different bacterial species, Escherichia coli O157:H7, Salmonella Enteritidis, Shigella flexneri, Staphylococcus aureus, and Listeria monocytogenes, growing, respectively, in trypticase soy broth were monitored by headspace solid-phase micro-extraction/gas chromatography-mass spectrometry. The results showed that most volatile organic compounds (VOCs) of five pathogens started to increase after the sixth to tenth hour. Methyl ketones and long chain alcohols were representative volatiles for three Gram-negative bacteria...
November 22, 2016: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/27871757/an-approach-to-the-environmental-prioritisation-of-volatile-methylsiloxanes-in-several-matrices
#20
Vera Homem, Daniela Capela, José Avelino Silva, Alessandra Cincinelli, Lúcia Santos, Arminda Alves, Nuno Ratola
Siloxane-based compounds are widely used in personal care, pharmaceutical and household products as well as in industrial applications. Among the wide variety of these chemicals, special attention has been given to volatile methylsiloxanes (VMSs). These compounds have been extensively detected in several environmental compartments, as they are not effectively removed from wastewater and may migrate through different matrices and being lipophilic, bioaccumulate and biomagnify in living organisms. In this work, a prioritisation methodology for several VMSs in different environmental matrices was applied, estimating a hazard quotient by combining exposure evaluation through measured or predicted environmental concentrations (MEC or PEC) and effects using ecotoxicity data to establish no effect concentrations (PNEC)...
November 18, 2016: Science of the Total Environment
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