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https://www.readbyqxmd.com/read/28221266/body-mass-index-and-the-association-with-vaso-occlusive-crises-in-pediatric-sickle-cell-disease
#1
Andrea Zivot, Nataly Apollonsky, Edward Gracely, Deepti Raybagkar
BACKGROUND: Children with sickle cell disease (SCD) historically have been underweight and have poor overall growth. Recent studies have demonstrated a trend toward obesity in pediatric SCD populations. MATERIALS AND METHODS: Through retrospective chart review of patients with SCD followed at our center, we collected patient's data, including body mass index (BMI), weight percentiles, sickle cell genotype, baseline hemoglobin, medical and psychiatric comorbidities, 25-hydroxy vitamin D level, treatment with hydroxyurea, and chronic transfusions...
February 17, 2017: Journal of Pediatric Hematology/oncology
https://www.readbyqxmd.com/read/28218729/exhaled-breath-metabolomics-for-the-diagnosis-of-pneumonia-in-intubated-and-mechanically-ventilated-intensive-care-unit-icu-patients
#2
Pouline M P van Oort, Sanne de Bruin, Hans Weda, Hugo H Knobel, Marcus J Schultz, Lieuwe D Bos, On Behalf Of The Mars Consortium
The diagnosis of hospital-acquired pneumonia remains challenging. We hypothesized that analysis of volatile organic compounds (VOCs) in exhaled breath could be used to diagnose pneumonia or the presence of pathogens in the respiratory tract in intubated and mechanically-ventilated intensive care unit patients. In this prospective, single-centre, cross-sectional cohort study breath from mechanically ventilated patients was analysed using gas chromatography-mass spectrometry. Potentially relevant VOCs were selected with a p-value < 0...
February 19, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28218253/environmental-conditions-regulate-the-impact-of-plants-on-cloud-formation
#3
D F Zhao, A Buchholz, R Tillmann, E Kleist, C Wu, F Rubach, A Kiendler-Scharr, Y Rudich, J Wildt, Th F Mentel
The terrestrial vegetation emits large amounts of volatile organic compounds (VOC) into the atmosphere, which on oxidation produce secondary organic aerosol (SOA). By acting as cloud condensation nuclei (CCN), SOA influences cloud formation and climate. In a warming climate, changes in environmental factors can cause stresses to plants, inducing changes of the emitted VOC. These can modify particle size and composition. Here we report how induced emissions eventually affect CCN activity of SOA, a key parameter in cloud formation...
February 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/28216790/charged-grain-boundaries-reduce-the-open-circuit-voltage-of-polycrystalline-solar-cells-an-analytical-description
#4
Benoit Gaury, Paul M Haney
Analytic expressions are presented for the dark current-voltage relation J(V ) of a pn(+) junction with positively charged columnar grain boundaries with high defect density. These expressions apply to non-depleted grains with sufficiently high bulk hole mobilities. The accuracy of the formulas is verified by direct comparison to numerical simulations. Numerical simulations further show that the dark J(V ) can be used to determine the open-circuit potential Voc of an illuminated junction for a given short-circuit current density Jsc...
December 21, 2016: Journal of Applied Physics
https://www.readbyqxmd.com/read/28215812/indoor-air-pollutants-ventilation-rate-determinants-and-potential-control-strategies-in-chinese-dwellings-a-literature-review
#5
Wei Ye, Xu Zhang, Jun Gao, Guangyu Cao, Xiang Zhou, Xing Su
After nearly twenty years of rapid modernization and urbanization in China, huge achievements have transformed the daily lives of the Chinese people. However, unprecedented environmental consequences in both indoor and outdoor environments have accompanied this progress and have triggered public awareness and demands for improved living standards, especially in residential environments. Indoor pollution data measured for >7000 dwellings (approximately 1/3 were newly decorated and were tested for volatile organic compound (VOC) measurements, while the rest were tested for particles, phthalates and other semi-volatile organic compounds (SVOCs), moisture/mold, inorganic gases and radon) in China within the last ten years were reviewed, summarized and compared with indoor concentration recommendations based on sensory or health end-points...
February 16, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28214942/an-analytical-investigation-of-ozone-episodes-in-bangu-rio-de-janeiro
#6
Claudio Gabriel Pinheiro Geraldino, Eduardo Monteiro Martins, Cleyton Martins da Silva, Graciela Arbilla
This study investigated the potential factors that contribute to frequent high levels of ozone as well as ozone episodes in Bangu, one of the most critical areas in the city of Rio de Janeiro regarding ozone levels. For 74 days in a two-year period (10.3%), the national air quality standard was exceeded. For the same period, a total of 378 days (51.8%) had ozone concentrations that were between 80 and 160 µg m(-3). A statistical analysis of pollutant concentrations and meteorological data as well as a kinetic and mechanistic analysis of VOC reactivity showed that the high ozone concentrations did not seem to be closely related to local emissions but, rather, were related to pollutant transport and triggered by photochemical activity...
February 18, 2017: Bulletin of Environmental Contamination and Toxicology
https://www.readbyqxmd.com/read/28214624/effect-of-cobalt-loading-on-the-solid-state-properties-and-ethyl-acetate-oxidation-performance-of-cobalt-cerium-mixed-oxides
#7
M Konsolakis, S A C Carabineiro, G E Marnellos, M F Asad, O S G P Soares, M F R Pereira, J J M Órfão, J L Figueiredo
Cobalt-cerium mixed oxides were prepared by the wet impregnation method and evaluated for volatile organic compounds (VOCs) abatement, using ethyl acetate (EtAc) as model molecule. The impact of Co content on the physicochemical characteristics of catalysts and EtAc conversion was investigated. The materials were characterized by various techniques, including N2 adsorption at -196°C, scanning electron microscopy (SEM), X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR) and X-ray photoelectron spectroscopy (XPS) to reveal the structure-activity relationship...
February 10, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28213142/extraction-preparation-and-application-of-pigments-from-cordyline-fruticosa-and-hylocereus-polyrhizus-as-sensitizers-for-dye-sensitized-solar-cells
#8
Mahmoud A M Al-Alwani, Norasikin A Ludin, Abu Bakar Mohamad, Abd Amir H Kadhum, Kamaruzzaman Sopian
Current study employs mixture of chlorophyll-anthocyanin dye extracted from leaves of Cordyline fruticosa as new sensitizers for dye-sensitized solar cell (DSSCs), as well as betalains dye obtained from fruit of Hylocereus polyrhizus. Among ten pigments solvents, the ethanol and methanol extracts revealed higher absorption spectra of pigments extracted from C. fruticosa and H. polyrhizus respectively. A major effect of temperature increase was studied to increase the extraction yield. The results indicated that extraction temperature between 70 and 80°C exhibited a high dye concentration of each plant than other temperatures...
February 14, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/28213029/antifungal-effect-of-volatile-organic-compounds-produced-by-bacillus-amyloliquefaciens-cpa-8-against-fruit-pathogen-decays-of-cherry
#9
A Gotor-Vila, N Teixidó, A Di Francesco, J Usall, L Ugolini, R Torres, M Mari
The present work focuses on the antifungal effect of volatile organic compounds (VOCs) produced by Bacillus amyloliquefaciens CPA-8 against Monilinia laxa, M. fructicola and Botrytis cinera, three postharvest fruit pathogens of sweet cherry fruit. VOCs were evaluated with a double petri dish assay against mycelial and colony growth of target pathogens. For this purpose, CPA-8 was grown on different media and cultured for 24 and 48 h at 30 °C before assays. Data showed that mycelial growth inhibition was higher when CPA-8 was grown on Tryptone Soya Agar (TSA) while no differences were generally observed when CPA-8 was cultured for either, 24 and 48 h...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28213021/comparing-ptr-ms-profile-of-milk-inoculated-with-pure-or-mixed-cultures-of-spoilage-bacteria
#10
Mohammad Alothman, Karen A Lusk, Patrick Silcock, Phil J Bremer
The volatile organic compounds (VOCs) associated with UHT milk (n=8) inoculated with either pure inoculums of Pseudomonas fluorescens (two strains tested) or Chryseobacterium sp., or with mixed cultures of 2 or all 3 of the bacterial strains, and held at 4.5 °C for up to 26 days was measured using proton transfer reaction - mass spectrometry (PTR-MS). The VOCs evolved included a range of carbonyl compounds, alcohols, esters, and acids and had significant qualitative and quantitative differences between the inoculums...
June 2017: Food Microbiology
https://www.readbyqxmd.com/read/28212294/volatile-profiles-of-emissions-from-different-activities-analyzed-using-canister-samplers-and-gas-chromatography-mass-spectrometry-gc-ms-analysis-a-case-study
#11
Santino Orecchio, Michele Fiore, Salvatore Barreca, Gabriele Vara
The objective of present study was to identify volatile organic compounds (VOCs) emitted from several sources (fuels, traffic, landfills, coffee roasting, a street-food laboratory, building work, indoor use of incense and candles, a dental laboratory, etc.) located in Palermo (Italy) by using canister autosamplers and gas chromatography-mass spectrometry (GC-MS) technique. In this study, 181 VOCs were monitored. In the atmosphere of Palermo city, propane, butane, isopentane, methyl pentane, hexane, benzene, toluene, meta- and para-xylene, 1,2,4 trimethyl benzene, 1,3,5 trimethyl benzene, ethylbenzene, 4 ethyl toluene and heptane were identified and quantified in all sampling sites...
February 15, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28211919/high-performance-regular-perovskite-solar-cells-employing-low-cost-poly-ethylenedioxythiophene-as-a-hole-transporting-material
#12
Xiaoqing Jiang, Ze Yu, Yuchen Zhang, Jianbo Lai, Jiajia Li, Gagik G Gurzadyan, Xichuan Yang, Licheng Sun
Herein, we successfully applied a facile in-situ solid-state synthesis of conducting polymer poly(3,4-ethylenedioxythiophene) (PEDOT) as a HTM, directly on top of the perovskite layer, in conventional mesoscopic perovskite solar cells (PSCs) (n-i-p structure). The fabrication of the PEDOT film only involved a very simple in-situ solid-state polymerisation step from a monomer 2,5-dibromo-3,4-ethylenedioxythiophene (DBEDOT) made from a commercially available and cheap starting material. The ultraviolet photoelectron spectroscopy (UPS) demonstrated that the as-prepared PEDOT film possesses the highest occupied molecular orbital (HOMO) energy level of -5...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28208691/volatile-organic-compounds-sensing-using-optical-fibre-long-period-grating-with-mesoporous-nano-scale-coating
#13
Jiri Hromadka, Sergiy Korposh, Matthew Partridge, Stephen W James, Frank Davis, Derrick Crump, Ralph P Tatam
A long period grating (LPG) modified with a mesoporous film infused with a calixarene as a functional compound was employed for the detection of individual volatile organic compounds (VOCs) and their mixtures. The mesoporous film consisted of an inorganic part, SiO₂ nanoparticles (NPs), along with an organic moiety of poly(allylamine hydrochloride) polycation PAH, which was finally infused with the functional compound, p-sulphanato calix[4]arene (CA[4]) or p-sulphanato calix[8]arene (CA[8]). The LPG sensor was designed to operate at the phase matching turning point to provide the highest sensitivity...
February 8, 2017: Sensors
https://www.readbyqxmd.com/read/28208308/ultrasensitive-surface-enhanced-raman-scattering-sensor-of-gaseous-aldehydes-as-biomarkers-of-lung-cancer-on-dendritic-ag-nanocrystals
#14
Zhen Zhang, Wei Yu, Jing Wang, Dan Luo, Xuezhi Qiao, Xiaoyun Qin, Tie Wang
Surface-enhanced Raman scattering (SERS) is expected as a technique that even theoretically detected chemicals at the single molecule level by surface plasmon phenomena of noble metal nanostructures. Insensitivity of detecting Raman weak-intensity molecules and low adsorptivity of gaseous molecules on solid substrates are two main factors hindering the application of SERS in gas detectors. In this manuscript, we demonstrated an operational SERS strategy to detect gaseous Raman weak-intensity aldehydes that have been considered as a biomarker of lung cancer for abnormal content was measured in volatile organic compounds (VOCs) of lung cancer patients...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28202267/large-eddy-simulation-of-reactive-pollutants-in-a-deep-urban-street-canyon-coupling-dynamics-with-o3-nox-voc-chemistry
#15
Jian Zhong, Xiao-Ming Cai, William James Bloss
A large eddy simulation (LES) model coupled with O3-NOx-VOC chemistry is implemented to simulate the coupled effects of emissions, mixing and chemical pre-processing within an idealised deep (aspect ratio = 2) urban street canyon under a weak wind condition. Reactive pollutants exhibit significant spatial variations in the presence of two vertically aligned unsteady vortices formed in the canyon. Comparison of the LES results from two chemical schemes (simple NOx-O3 chemistry and a more comprehensive Reduced Chemical Scheme (RCS) chemical mechanism) shows that the concentrations of NO2 and Ox inside the street canyon are enhanced by approximately 30-40% via OH/HO2 chemistry...
February 12, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28202239/vehicle-emission-trends-in-china-s-guangdong-province-from-1994-to-2014
#16
Yong-Hong Liu, Wen-Yuan Liao, Li Li, Yu-Ting Huang, Wei-Jia Xu
Exploring vehicle emission trends within and outside the Pearl River Delta (PRD) region during a long period was scientific and practical, for the economic rapid unbalanced development, continuous implements of severe reducing vehicle emissions measures in Guangdong province. Multi-year inventories of vehicle emissions from 1994 to 2014 were estimated based on the emissions factors of different emissions standards and vehicle kilometers travelled for all types of vehicles. The trends and characteristics of the emissions of carbon monoxide (CO), volatile organic compounds (VOCs), nitrogen oxides (NOx), fine particulate matter (PM2...
February 12, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28195297/efficient-planar-n-i-p-type-heterojunction-flexible-perovskite-solar-cells-with-sputtered-tio2-electron-transporting-layers
#17
Sawanta S Mali, Chang Kook Hong, A I Inamdar, Hyunsik Im, Sang Eun Shim
The development of hybrid organo-lead trihalide perovskite solar cells (PSCs) comprising an electron transporting layer (ETL), a perovskite light absorber and a hole transporting layer (HTL) has received significant attention for their potential in efficient PSCs. However, the preparation of a compact and uniform ETL and the formation of a uniform light absorber layer suffer from a high temperature processing treatment and the formation of unwanted perovskite islands, respectively. A low temperature/room temperature processed ETL is one of the best options for the fabrication of flexible PSCs...
February 14, 2017: Nanoscale
https://www.readbyqxmd.com/read/28193616/assessing-the-effectiveness-of-topical-betamethasone-to-treat-chronic-chilblains-a-randomised-clinical-trial-in-primary-care
#18
Ibo H Souwer, Jacobus Hj Bor, Paul Smits, Antoine Lm Lagro-Janssen
BACKGROUND: GPs prescribe topical corticosteroids to patients with chronic chilblains despite poor evidence for their effectiveness. The authors of the current study therefore decided to assess the effectiveness of topical steroids in a primary care setting. AIM: To assess the effectiveness of topical application of betamethasone valerate 0.1% cream in patients with chronic chilblains. DESIGN AND SETTING: A placebo-controlled, double-blind, crossover, randomised clinical trial in a Dutch primary care setting...
February 13, 2017: British Journal of General Practice: the Journal of the Royal College of General Practitioners
https://www.readbyqxmd.com/read/28193061/metal-organic-frameworks-for-resonant-gravimetric-detection-of-trace-level-xylene-molecules
#19
Tao Xu, Pengcheng Xu, Dan Zheng, Haitao Yu, Xinxin Li
As one of typical VOCs, xylene is seriously harmful to human health. Nowadays, however, there is really lack of portable sensing method to directly detect environmental xylene that has chemical inertness. Especially when the concentration of xylene is lower than the human olfactory threshold of 470 ppb, people are indeed hard to be aware of and avoid this harmful vapor. Herein the metal-organic framework (MOF) of HKUST-1 is first explored for sensing to the nonpolar molecule of p-xylene. And the sensing mechanism is identified that is via host-guest interaction of MOF with xylene molecule...
December 20, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/28192487/volatile-organic-compounds-of-thai-honeys-produced-from-several-floral-sources-by-different-honey-bee-species
#20
Praetinee Pattamayutanon, Sergio Angeli, Prodpran Thakeow, John Abraham, Terd Disayathanoowat, Panuwan Chantawannakul
The volatile organic compounds (VOCs) of four monofloral and one multifloral of Thai honeys produced by Apis cerana, Apis dorsata and Apis mellifera were analyzed by headspace solid-phase microextraction (HS-SPME) followed by gas chromatography and mass spectrometry (GC-MS). The floral sources were longan, sunflower, coffee, wild flowers (wild) and lychee. Honey originating from longan had more VOCs than all other floral sources. Sunflower honey had the least numbers of VOCs. cis-Linalool oxide, trans-linalool oxide, ho-trienol, and furan-2,5-dicarbaldehyde were present in all the honeys studied, independent of their floral origin...
2017: PloS One
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