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Volatile organic compounds

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https://www.readbyqxmd.com/read/27924400/an-insight-into-the-secondary-metabolism-of-muscodor-yucatanensis-small-molecule-epigenetic-modifiers-induce-expression-of-secondary-metabolism-related-genes-and-production-of-new-metabolites-in-the-endophyte
#1
Masroor Qadri, Yedukondalu Nalli, Shreyans K Jain, Asha Chaubey, Asif Ali, Gary A Strobel, Ram A Vishwakarma, Syed Riyaz-Ul-Hassan
Muscodor spp. are proficient producers of bioactive volatile organic compounds (VOCs) with many potential applications. However, all members of this genus produce varying amounts and types of VOCs which suggests the involvement of epigenetics as a possible explanation. The members of this genus are poorly explored for the production of soluble compounds (extrolites). In this study, the polyketide synthase (PKS) and non-ribosomal peptide synthetase (NRPS) genes from an endophyte, Muscodor yucatanensis Ni30, were cloned and sequenced...
December 6, 2016: Microbial Ecology
https://www.readbyqxmd.com/read/27924121/overexpression-of-panax-ginseng-sesquiterpene-synthase-gene-confers-tolerance-against-pseudomonas-syringae-pv-tomato-in-arabidopsis-thaliana
#2
Sung-Joo Yoon, Johan Sukweenadhi, Altanzul Khorolragchaa, Ramya Mathiyalagan, Sathiyamoorthy Subramaniyam, Yeon-Ju Kim, Ho-Bin Kim, Mi-Jung Kim, Yu-Jin Kim, Deok-Chun Yang
Sesquiterpenes are an abundant group belonging to the terpenoid family, with a C15 structure comprise of three isoprene units. Many sesquiterpenes are volatile compounds and it act as chemical messenger in plant signalling, particularly in the defense mechanism against biotic and abiotic stresses. Panax ginseng Meyer is important medicinal herbs with various reported pharmacological efficacies in which its triterpenoid saponins, called ginsenosides, were mostly studied. However, there have been few studies on volatile sesquiterpenes compounds regulation on P...
October 2016: Physiology and Molecular Biology of Plants: An International Journal of Functional Plant Biology
https://www.readbyqxmd.com/read/27923877/poison-and-alarm-the-asian-hornet-vespa-velutina-uses-sting-venom-volatiles-as-alarm-pheromone
#3
Ya-Nan Cheng, Ping Wen, Shi-Hao Dong, Ken Tan, James C Nieh
In colonial organisms, alarm pheromones can provide a key fitness advantage by enhancing colony defense and warning of danger. Learning which species use alarm pheromone and the key compounds involved therefore enhances our understanding of how this important signal has evolved. However, our knowledge of alarm pheromones is more limited in the social wasps and hornets as compared to the social bees and ants. Vespa velutina is an economically important and widespread hornet predator that attacks humans and honey bees...
December 6, 2016: Journal of Experimental Biology
https://www.readbyqxmd.com/read/27918484/a-novel-wireless-wearable-volatile-organic-compound-voc-monitoring-device-with-disposable-sensors
#4
Yue Deng, Cheng Chen, Xiaojun Xian, Francis Tsow, Gaurav Verma, Rob McConnell, Scott Fruin, Nongjian Tao, Erica S Forzani
A novel portable wireless volatile organic compound (VOC) monitoring device with disposable sensors is presented. The device is miniaturized, light, easy-to-use, and cost-effective. Different field tests have been carried out to identify the operational, analytical, and functional performance of the device and its sensors. The device was compared to a commercial photo-ionization detector, gas chromatography-mass spectrometry, and carbon monoxide detector. In addition, environmental operational conditions, such as barometric change, temperature change and wind conditions were also tested to evaluate the device performance...
December 3, 2016: Sensors
https://www.readbyqxmd.com/read/27918460/indoor-air-quality-in-the-metro-system-in-north-taiwan
#5
Ying-Yi Chen, Fung-Chang Sung, Mei-Lien Chen, I-Fang Mao, Chung-Yen Lu
Indoor air pollution is an increasing health concern, especially in enclosed environments such as underground subway stations because of increased global usage by urban populations. This study measured the indoor air quality of underground platforms at 10 metro stations of the Taipei Rapid Transit system (TRTS) in Taiwan, including humidity, temperature, carbon monoxide (CO), carbon dioxide (CO₂), formaldehyde (HCHO), total volatile organic compounds (TVOCs), ozone (O₃), airborne particulate matter (PM10 and PM2...
December 2, 2016: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/27918108/toward-tunable-photonic-nanosheet-sensors-strong-influence-of-the-interlayer-cation-on-the-sensing-characteristics
#6
Pirmin Ganter, Leslie M Schoop, Bettina V Lotsch
An approach toward intercalant tunable nanosheet-based Fabry-Pérot sensors is presented. The intercalant tetrabutylammonium significantly increases the sensitivity of the photonic nose sensor to volatile organic compounds with increasing polarity, enabling polarity-driven color-coded vapor differentiation. Paired with the improved millisecond response times for polar vapors, vapor imaging with spatio-temporal resolution is within reach.
December 5, 2016: Advanced Materials
https://www.readbyqxmd.com/read/27917180/role-of-the-gacs-sensor-kinase-in-the-regulation-of-volatile-production-by-plant-growth-promoting-pseudomonas-fluorescens-sbw25
#7
Xu Cheng, Viviane Cordovez, Desalegn W Etalo, Menno van der Voort, Jos M Raaijmakers
In plant-associated Pseudomonas species, the production of several secondary metabolites and exoenzymes is regulated by the GacS/GacA two-component regulatory system (the Gac-system). Here, we investigated if a mutation in the GacS sensor kinase affects the production of volatile organic compounds (VOCs) in P. fluorescens SBW25 (Pf.SBW25) and how this impacts on VOCs-mediated growth promotion and induced systemic resistance of Arabidopsis and tobacco. A total of 205 VOCs were detected by Gas Chromatography Mass Spectrometry for Pf...
2016: Frontiers in Plant Science
https://www.readbyqxmd.com/read/27916309/optical-properties-of-secondary-organic-aerosols-derived-from-long-chain-alkanes-under-various-nox-and-seed-conditions
#8
Junling Li, Kun Li, Weigang Wang, Jing Wang, Chao Peng, Maofa Ge
Long-chain alkanes are a type of important intermediate-volatile organic compounds (IVOCs) in the atmosphere, which contribute to a large proportion of secondary organic aerosol (SOA). However, the optical properties of SOA derived from long-chain alkanes remain poorly understood. Here, we investigate the refractive index (RI) of SOA derived from photo-oxidation of dodecane (C12), pentadecane (C15) and heptadecane (C17) under low-NOx and high-NOx conditions with the absence or presence of inorganic aerosol seeds...
December 1, 2016: Science of the Total Environment
https://www.readbyqxmd.com/read/27915467/the-physics-of-pollinator-attraction
#9
REVIEW
Edwige Moyroud, Beverley J Glover
Contents 1 I. 1 II. 1 III. 3 IV. 4 V. 4 4 References 5 SUMMARY: This Tansley Insight focuses on recent advances in our understanding of how flowers manipulate physical forces to attract animal pollinators and ensure reproductive success. Research has traditionally explored the role of chemical pigments and volatile organic compounds as cues for pollinators, but recent reports have demonstrated the importance of physical and structural means of pollinator attraction. Here we explore the role of petal microstructure in influencing floral light capture and optics, analysing colour, gloss and polarization effects...
December 4, 2016: New Phytologist
https://www.readbyqxmd.com/read/27911440/the-prey-s-scent-volatile-organic-compound-mediated-interactions-between-soil-bacteria-and-their-protist-predators
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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