1. Ultra-low leakage and high breakdown Schottky diodes fabricated on free-standing GaN substrateYaqi Wang, Siddharth Alur, Yogesh Sharma, Fei Tong, Resham Thapa, Patrick Gartland, Tamara Issacs-Smith, Claude Ahyi, John Williams, Minseo Park, Mark Johnson, Tanya Paskova, Edward A Preble, Keith Evans, 2011, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: free-standing GaN substrate, Ultra-low leakage and high breakdown Schottky diodes
Objavljeno: 16.01.2017; Ogledov: 2970; Prenosov: 0
 Polno besedilo (266,96 KB) |
2. Growth of ZnO Nanorod Arrays on Flexible Substrates: Effect of Precursor Solution ConcentrationEunhee Lim, Sungkoo Lee, Dong-Joo Kim, Hyejin Park, Hosang Ahn, Tamara Issacs-Smith, John Williams, Ayayi Ahyi, Yogesh Sharma, Aaron Modic, Resham Thapa, Kyusang Kim, Yaqi Wang, Fei Tong, Kyeong K. Lee, Minseo Park, 2012, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: ZnO Nanorod Arrays, ITO-PET, solution growth
Objavljeno: 16.01.2017; Ogledov: 3155; Prenosov: 0
Polno besedilo (7,03 MB) |
3. Electrical characteristics of the vertical GaN rectifiers fabricated on bulk GaN waferTanya Paskova, Andrew Hanser, Andrew A. Allerman, Mark Johnson, Ginger Wheeler, Minseo Park, John Williams, Claude Ahyi, Tamara Issacs-Smith, Patrick Gartland, Fei Tong, Yogesh Sharma, Siddharth Alur, Hui Xu, Yaqi Wang, Edward A. Preble, Keith R. Evans, 2011, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: GaN, rectifier
Objavljeno: 17.01.2017; Ogledov: 3085; Prenosov: 0
Polno besedilo (216,76 KB) |
4. Vitis vinifera root and leaf metabolic composition during fruit maturation: Implications of defoliationAlain Deloire, Bruno, P. Holzapfel, Celia Barril, Jason, A Smith, Katja Šuklje, Baverley, A, Orchard, Gerhard, C. Rossouw, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: leaf removal, metabolomics, primary metabolsim, vitis vinifera
Objavljeno: 26.07.2017; Ogledov: 3531; Prenosov: 0
Polno besedilo (1,67 MB) |
5. Vitis vinifera berry metabolic composition during fruit maturation: Implications of defoliationGerhard C. Rossouw, Katja Šuklje, Jason P. Smith, Celia Barril, Alain Deloire, Holzapfel Bruno, 2018, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: vinska trta, defoliacija, metabolomika, primarni metabolizem
Objavljeno: 03.04.2018; Ogledov: 3249; Prenosov: 0
Polno besedilo (1,28 MB) |
6. Atmospheric chemistry and physics in the atmosphere of a developed megacity (London): An overview of the REPARTEE experiment and its conclusionsGavin J Phillips, Carole Helfter, Chiara F Di Marco, Eiko Nemitz, Fay Davies, Janet F Barlow, Tyrone Dunbar, Iain R White, Dudley E Shallcross, Stephen J Henshaw, K Fredrik Peterson, Brian Davison, Damien Martin, Ben Langford, C Nicholas Hewitt, Stephen M Ball, Justin M Langridge, A K Benton, Roderick L Jones, Paul I Williams, John Whitehead, Martin W Gallagher, Claire Martin, James R Dorsey, Hugh Coe, James D Allan, William J Bloss, Alistair J Thorpe, David C S Beddows, Manuel DallOsto, Roy M Harrison, Steven Smith, 2012, pregledni znanstveni članek Opis: The Regents Park and Tower Environmental Experiment (REPARTEE) comprised two campaigns in London in October 2006 and October/November 2007. The experiment design involved measurements at a heavily trafficked roadside site, two urban background sites and an elevated site at 160-190 m above ground on the BT Tower, supplemented in the second campaign by Doppler lidar measurements of atmospheric vertical structure. A wide range of measurements of airborne particle physical metrics and chemical composition were made as well as measurements of a considerable range of gas phase species and the fluxes of both particulate and gas phase substances. Significant findings include (a) demonstration of the evaporation of traffic-generated nanoparticles during both horizontal and vertical atmospheric transport; (b) generation of a large base of information on the fluxes of nanoparticles, accumulation mode particles and specific chemical components of the aerosol and a range of gas phase species, as well as the elucidation of key processes and comparison with emissions inventories; (c) quantification of vertical gradients in selected aerosol and trace gas species which has demonstrated the important role of regional transport in influencing concentrations of sulphate, nitrate and secondary organic compounds within the atmosphere of London; (d) generation of new data on the atmospheric structure and turbulence above London, including the estimation of mixed layer depths; (e) provision of new data on trace gas dispersion in the urban atmosphere through the release of purposeful tracers; (f) the determination of spatial differences in aerosol particle size distributions and their interpretation in terms of sources and physico-chemical transformations; (g) studies of the nocturnal oxidation of nitrogen oxides and of the diurnal behaviour of nitrate aerosol in the urban atmosphere, and (h) new information on the chemical composition and source apportionment of particulate matter size fractions in the atmosphere of London derived both from bulk chemical analysis and aerosol mass spectrometry with two instrument types.
Najdeno v: osebi
Ključne besede: megacity, trace gas, urban atmosphere, atmospheric transport, chemical composition, aerosol
Objavljeno: 18.07.2019; Ogledov: 1964; Prenosov: 0
Polno besedilo (4,66 MB) |
7. TD/GC–MS analysis of volatile markers emitted from mono- and co-cultures of Enterobacter cloacae and Pseudomonas aeruginosa in artificial sputumCraig Portsmouth, Pedro Povoa, Jan H Leopold, Pouline M P van Oort, Emili Diaz, Gemma Goma, Timothy Felton, Paul Dark, Alan Davie, Luis Coelho, Lieuwe D Bos, Marta Camprubi, Antonio Artigas, Jonathan Barnard-Smith, Waqar M Ahmed, Stephen J Fowler, Tamara M E Nijsen, Royston Goodacre, Weda Hans, Hugo Knobel, Oluwasola Lawal, Iain R White, 2018, izvirni znanstveni članek Opis: Introduction: Infections such as ventilator-associated pneumonia (VAP) can be caused by one or more pathogens. Current methods for identifying these pathogenic microbes often require invasive sampling, and can be time consuming, due to the requirement for prolonged cultural enrichment along with selective and differential plating steps. This results in delays in diagnosis which in such critically ill patients can have potentially life-threatening consequences. Therefore, a non-invasive and timely diagnostic method is required. Detection of microbial volatile organic compounds (VOCs) in exhaled breath is proposed as an alternative method for identifying these pathogens and may distinguish between mono- and poly-microbial infections. Objectives: To investigate volatile metabolites that discriminate between bacterial mono- and co-cultures. Methods: VAP-associated pathogens Enterobacter cloacae and Pseudomonas aeruginosa were cultured individually and together in artificial sputum medium for 24 h and their headspace was analysed for potential discriminatory VOCs by thermal desorption gas chromatography–mass spectrometry. Results: Of the 70 VOCs putatively identified, 23 were found to significantly increase during bacterial culture (i.e. likely to be released during metabolism) and 13 decreased (i.e. likely consumed during metabolism). The other VOCs showed no transformation (similar concentrations observed as in the medium). Bacteria-specific VOCs including 2-methyl-1-propanol, 2-phenylethanol, and 3-methyl-1-butanol were observed in the headspace of axenic cultures of E. cloacae, and methyl 2-ethylhexanoate in the headspace of P. aeruginosa cultures which is novel to this investigation. Previously reported VOCs 1-undecene and pyrrole were also detected. The metabolites 2-methylbutyl acetate and methyl 2-methylbutyrate, which are reported to exhibit antimicrobial activity, were elevated in co-culture only. Conclusion: The observed VOCs were able to differentiate axenic and co-cultures. Validation of these markers in exhaled breath specimens could prove useful for timely pathogen identification and infection type diagnosis.
Najdeno v: osebi
Ključne besede: Bacteria, Enterobacter cloacae, Gas Chromatography-Mass Spectrometry, Infection, Pseudomonas aeruginosa, Volatile organic compounds
Objavljeno: 18.07.2019; Ogledov: 1826; Prenosov: 73
Polno besedilo (1,29 MB) |
8. Detection and quantification of exhaled volatile organic compounds in mechanically ventilated patients–comparison of two sampling methodsIain R. White, Pouline M. van Oort, Waqar Ahmed, Craig Johnson, Jonathan Bannard-Smith, Timothy Felton, Lieuwe D. Bos, Royston Goodacre, Paul Dark, Stephen J. Fowler, 2020, izvirni znanstveni članek Opis: Exhaled breath analysis is a promising new diagnostic tool, but currently no standardised method for sampling is available in mechanically ventilated patients. We compared two breath sampling methods, first using an artificial ventilator circuit, then in “real life” in mechanically ventilated patients on the intensive care unit. In the laboratory circuit, a 24-component synthetic-breath volatile organic compound (VOC) mixture was injected into the system as air was sampled: (A) through a port on the exhalation limb of the circuit and (B) through a closed endo-bronchial suction catheter. Sorbent tubes were used to collect samples for analysis by thermal desorption-gas chromatography-mass spectrometry. Realistic mechanical ventilation rates and breath pressure–volume loops were established and method detection limits (MDLs) were calculated for all VOCs. Higher yields of VOCs were retrieved using the closed suction catheter; however, for several VOCs MDLs were compromised due to the background signal associated with plastic and rubber components in the catheters. Different brands of suction catheter were compared. Exhaled VOC data from 40 patient samples collected at two sites were then used to calculate the proportion of data analysed above the MDL. The relative performance of the two methods differed depending on the VOC under study and both methods showed sensitivity towards different exhaled VOCs. Furthermore, method performance differed depending on recruitment site, as the centres were equipped with different brands of respiratory equipment, an important consideration for the design of multicentre studies investigating exhaled VOCs in mechanically ventilated patients.
Najdeno v: osebi
Ključne besede: Volatile organic compounds, infection, breath, ventilator associated pneumonia
Objavljeno: 10.12.2020; Ogledov: 1184; Prenosov: 0
Polno besedilo (1,61 MB) |
9. Characterization of airborne ice-nucleation-active bacteria and bacterial fragmentsTina Šantl Temkiv, Maher Sahyoun, Kai Finster, Susan Hartmann, Stefanie Augustin-Bauditz, Frank Stratmann, Heike Wex, Tina Clauss, Niels Woetman Nielsen, Jens Havskov Sørensen, Ulrik Smith Korsholm, Lukas Y. Wick, Ulrich Gosewinkel Karlson, 2015, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: INA bacteria, Ice nucleation, Airborne bacteria, Aeromicrobiology, Bioprecipitation, Outer membrane vesicles
Objavljeno: 04.01.2021; Ogledov: 1005; Prenosov: 0
Polno besedilo (3,10 MB) |
10. Coherence scale of magnetic fields generated in early-time forward shocks of GRBsM. Marongiu, R. J. Smith, Cristiano Guidorzi, Carole G. Mundell, N. Jordana-Mitjans, Lorenzo Spina, S. Kobayashi, Andreja Gomboc, M. Shrestha, Iain A. Steele, 2021, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: astronomija, izbruhi sevanja gama, robotski teleskopi
Objavljeno: 17.06.2021; Ogledov: 747; Prenosov: 26
 Polno besedilo (0,00 KB)
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