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148 results for “Volatile organic compounds”
Breath Test for Chemicals (Volatile Organic Compounds)
ClinicalTrials.gov study NCT01437033. IPD Sharing: Not stated. Countries: 1. Publications: 3.
The Daytime Circadian Rhythm in Exhaled Volatile Organic Compounds in People Living Without and Diabetes
ClinicalTrials.gov study NCT05984979. IPD Sharing: NO. Countries: 1. Publications: 0.
Volatile Organic Compounds in Cystic Fibrosis
ClinicalTrials.gov study NCT01379040. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Lipidomics, Proteomics, Micro RNAs and Volatile Organic Compounds (VOC)
ClinicalTrials.gov study NCT02531607. IPD Sharing: NO. Countries: 1. Publications: 1.
Data and code from: Volatile organic compounds diversity mediates tree diversity-insect herbivory relationships
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Proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOF-MS) as a tool for studying animal volatile organic compound (VOC) emissions
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Bacterial community richness shifts the balance between volatile organic compound-mediated microbe-pathogen and microbe-plant interactions
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Data from: An optimized protocol for large-scale in situ sampling and analysis of volatile organic compounds
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Data from: Allelopathic effects of volatile organic compounds released from Pinus halepensis needles and roots
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Interfacial photochemistry of biogenic surfactants: a major source of abiotic volatile organic compounds?
<p> </p> <p>Electronic supplementary Information to the Faraday Discussions article:</p> <p>Interfacial photochemistry of biogenic surfactants: a major source of abiotic volatile organic compounds?</p> <p>https://doi.org/10.1039/C7FD00022G</p>
Figure 4 from: Llorens L, Ferriol P, Tomàs J, García MT, Gil L (2023) Can floral volatile organic compounds contribute to the taxonomy of the Rhamnus sect. Alaternus? Italian Botanist 16: 149-164. https://doi.org/10.3897/italianbotanist.16.116255
Figure 4 Non-metric multidimensional scaling ordination (NMDS) of floral scent profiles for Rhamnus alaternus (violet and empty circles), Rhamnus × bermejoi (blue and half black circles) and Rhamnus ludovici-salvatoris (green and black points).
Figure 3 from: Llorens L, Ferriol P, Tomàs J, García MT, Gil L (2023) Can floral volatile organic compounds contribute to the taxonomy of the Rhamnus sect. Alaternus? Italian Botanist 16: 149-164. https://doi.org/10.3897/italianbotanist.16.116255
Figure 3 VOCs similarity histogram of Rhamnus alaternus (violet), Rh. × bermejoi (blue) and Rh. ludovici-salvatoris (green). Colour intensity is related to the level of presence of a component in each sample.
Figure 2 from: Llorens L, Ferriol P, Tomàs J, García MT, Gil L (2023) Can floral volatile organic compounds contribute to the taxonomy of the Rhamnus sect. Alaternus? Italian Botanist 16: 149-164. https://doi.org/10.3897/italianbotanist.16.116255
Figure 2 Location of the Rhamnus populations included in the study. (See Suppl. material 1 for population abbreviations). Rh. alaternus open squares; Rh. ludovici-salvatoris filled triangles; Hybrids filled circle.
Figure 1 from: Llorens L, Ferriol P, Tomàs J, García MT, Gil L (2023) Can floral volatile organic compounds contribute to the taxonomy of the Rhamnus sect. Alaternus? Italian Botanist 16: 149-164. https://doi.org/10.3897/italianbotanist.16.116255
Figure 1 Inflorescences, flowers and major pollinator (Apis mellifera) of RhamnusA–CRh. alaternusD, ERh. ludovici-salvatorisFRh. × bermejoiG leaves of the three species.
Supplementary material 2 from: Llorens L, Ferriol P, Tomàs J, García MT, Gil L (2023) Can floral volatile organic compounds contribute to the taxonomy of the Rhamnus sect. Alaternus? Italian Botanist 16: 149-164. https://doi.org/10.3897/italianbotanist.16.116255
Floral scent chemistry
Supplementary material 1 from: Llorens L, Ferriol P, Tomàs J, García MT, Gil L (2023) Can floral volatile organic compounds contribute to the taxonomy of the Rhamnus sect. Alaternus? Italian Botanist 16: 149-164. https://doi.org/10.3897/italianbotanist.16.116255
Geographical location and sexuality of Rhamnus sampled plants
Measurements of volatile organic compounds in the Northern Colorado Front Range in 2023
<p>This dataset was collected by Colorado State University (CSU) students during the spring 2023 and fall 2023 semesters as part of a course in the Department of Atmospheric Science (ATS-716: Air Quality Characterization). Measurements of volatile organic compounds (VOCs) were collected in Northern Colorado, using a low-cost sensor called SENSIT SPOD. The SENSIT SPOD sensor package combines wind field and air pollutant concentration measurements to detect emission plumes and locate the source of those emissions. The sensor measures non-speciated, uncalibrated concentrations of a subset of VOCs. The sensor also measures temperature, relative humidity, pressure, and wind direction and speed. The SPODs were used to trigger the collection of whole air samples during periods with higher concentrations of VOCs. Air samples from the triggered canisters were analyzed at CSU using Gas Chromatography (GC) to provide a measure of approximately 50 VOCs. An integrated canister was used to measure the average concentration of approximately 50 VOCs over a one-week period. After collection, sample air in the canisters was analyzed at CSU using Gas Chromatography (GC).</p>
Intermediate volatility organic compounds (IVOCs) emissions based on source-specific emission ratios relative to non-methane volatile organic compounds (NMVOCs) give better representation of the spatial distribution of IVOCs in China
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Metrological generation of SI-traceable gas-phase standards and reference materials for (semi-) volatile organic compounds
<p>EN 16516 sets specifications for the determination of emissions into indoor air from construction products. Reliable, accurate and SI-traceable measurement results of the emissions are the key to consumer protection. Such measurement results can be obtained by using metrologically traceable reference materials. Gas-phase standards of volatile organic compounds (VOCs) in air can be prepared by a variety of dynamic methods according to the ISO 6145 series. However, these methods are not always applicable for semi-volatile organic compounds (SVOCs) due to their high boiling point and low vapour pressure. Therefore, a novel dynamic gas mixture generation system has been developed. With this system gas-phase standards with trace level VOCs and SVOCs in air can be prepared between 10 nmol mol<sup>-1</sup> and 1000 nmol mol<sup>-1</sup>. The VOCs and SVOCs in this study have normal boiling points ranging from 146 °C to 343 °C. Metrologically traceable reference materials of the gas-phase standard were obtained by sampling of the VOC gas-phase standard into Tenax TA® sorbent material in SilcoNert® coated stainless steel tubes. Accurately known masses between 10 ng and 1000 ng per VOC were sampled. These reference materials were used to validate the dynamic system. Furthermore, the storage and stability periods of the VOCs in the reference materials were determined as these are crucial characteristics to obtain accurate and SI-traceable reference materials. In a Round Robin Test (RRT), the reference materials were used with the aim of demonstrating the feasibility of providing SI-traceable standard reference values for SVOCs for interlaboratory comparison purposes. Based on the results from the validation, the storage and stability studies and the RRT, gas-phase standards and reference materials of VOCs and SVOCs with relative expanded uncertainties between 5 % and 12 % (<em>k</em> = 2) have been developed. These reference standards can be used as calibrants, reference materials or quality control materials for the analysis of VOC emissions.</p> <p>In this repository data from the validation, the storage and stability studies and the RRT are published which is used for the manuscript "Metrological generation of SI-traceable gas-phase standards and reference materials for (semi-) volatile organic compounds" published in Measurement Science and Technology.</p> <p>The following files can be found in this repository:</p> <p>- The following files contain data from the validation.Variation1_day1, Variation1_day2, Variation1_day3, Variation2_day1, Variation2_day2, Variation2_day3, Variation3_day1, Variation3_day2, Variation3_day3, Variation4_day1 and Variation4_day2. During the validation 4 different variations have been used and these have been tested on 3 or 2 days. The data contain information about the settings to obtain the gas-phase standard, reference materials and spiked tubes and the analysis data. </p> <p>- The "ANOVA validation data" file contains the ANOVA calculations used to obtain the repeatability standard deviation and reproducibility standard deviation.</p> <p>- The figure "Chromatogram VOCs used for the validation" is a copy of a chromatogram</p> <p>- The file "Storage and stability studies data" contains formation about the settings to obtain the gas-phase standard, reference materials and spiked tubes and the analysis data. </p> <p>- The figure "Chromatogram VOCs used for the storage and stability studies" is a copy of a chromatogram.</p> <p>- The file "RRT data" contains information about the settings to obtain the gas-phase standard, reference materials and spiked tubes and the analysis data. </p> <p>- The file "Report Homogeneity RRT" is a report on the homogeneity study performed during the RRT.</p> <p>- The figure "Chromatogram VOCs used for the RRT" is a copy of a chromatogram.</p> <p>- The file "VSL-Tubes-results-RR18-a". The dataset contains the results of a round robin test which tested the proficiency to analyse volatile organic compounds (VOC) of laboratories dealing with the determination of emissions from building materials. For this analysis check the participants were asked to send own sampling tubes filled with the adsorbent Tenax TA<sup>®</sup>, which were loaded with a reference gas mixture containing the compounds: styrene [100-42-5], n-decane [124-18-5], R(+)limonene [5989-27-5], 1,2,4-trimethylbenzene [95-63-6], decamethylcyclopentasiloxane [541-02-6], dimethylphthalate [131-11-3], dibutylphthalate [84-74-2], naphthalene [91-20-3], n-hexadecane [544-76-3] and eicosane [112-95 8]. These tubes were sent back to the participants for immediate analysis. The list of compounds was disclosed in advance. For all statistical evaluations, the mean values of the laboratories were used instead of all single measurement values. <strong>Expert laboratories:</strong> Laboratories who had successfully participated in the three former round robin tests (2014; 2016; 2018) organized by BAM were defined as expert laboratories. Their reported data were used to calculate the reference mean (ref. mean) and the reference standard deviation (ref st. dev.). <strong>Reference mean:</strong> The reference mean is determined as the robust mean value using the Hampel estimator (see Section C.5.3 in ISO 13528) on the basis of the results of the expert laboratories. It is a weighted arithmetic mean, with lower weights for outlying values. <strong>Standard deviation for proficiency assessment:</strong> The reference standard deviation for proficiency assessment is determined as the robust reproducibility standard deviation according to the Q method (see Section C.5.2 in ISO 13528) based on the results of the expert laboratories.</p>
SI_III_3_Composition of Antifungal Volatile Organic Compounds in Sextonia rubra Fruits by Molecular Networks
<p>Ce document présente les données supplémentaires générées lors de l'étude de l'hydrolat de fruit de <em>S. rubra</em> par HS-GC-EI-MS.</p>
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OpenNeuro
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