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25 results for “volatile organic compounds (VOCs)”
Technical note: Interferences of volatile organic compounds (VOC) on methane concentration measurements - Raw Data
<p>Technical note: Interferences of volatile organic compounds (VOC) on methane concentration measurements - Raw Data</p>
Long-term variations of ambient volatile organic compounds (VOCs) from 2016 to 2020 in Beijing, China
<p>Ambient volatile organic compounds (VOCs) are crucial precursors for the formation of secondary organic aerosol (SOA) and ozone (O<sub>3</sub>). We have conducted in-situ observations and compiled a comprehensive dataset of ambient volatile organic compound (VOC) compositions and concentrations in Beijing, China, spanning the period from 2016 to 2020. The dataset covers a wide range of VOC species including 29 alkanes, 11 alkenes, 1 alkyne, 16 aromatics, 28 halohydrocarbons, 13 oxygenated VOCs (OVOCs), and 1 nitrogenous VOC (acetonitrile). The presentation and analysis of this dataset is available in a paper submitted to Earth System Science Data (Simon et al, in prep). The findings and analysis of this dataset have been documented in a paper that has been submitted to Earth System Science Data (Liu et al., in prep).</p> <p>If you use the dataset for related scientific research, please cite the corresponding reference:</p> <p> Liu et al (in prep); Long-term variations of ambient volatile organic compounds (VOCs) from 2016 to 2020 in Beijing, China; Earth System Science Data.</p>
Unwanted loss of volatile organic compounds (VOCs) during in situ chemical oxidation sample preservation: Mechanisms and solutions
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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
<p>1. Chemical sensing in vertebrates is crucial in their lives, and efforts are undertaken towards deciphering their chemical language. Volatile organic compounds (VOCs) is a group of chemicals believed to play an essential role in a wide variety of animal interactions. Therefore, understanding what animals sense themselves and untangling the ecological role of their volatile cues can be accomplished by analysing VOC emissions. A Proton-Transfer Reaction Time-of-Flight Mass Spectrometer (PTR-TOF-MS) is an instrument that measures VOCs in real-time in an air sample. Since this technique acts as a hyper-sensitive 'nose' it has a similar potential in deciphering the chemical language of vertebrates.</p> <p>2. Here, we validate the use of PTR-TOF-MS as a tool to measure VOCs from vertebrates, which in turn will help resolve vertebrate interactions through VOCs. The instrument monitors and records the full spectrum of VOCs emitted by an individual with a high accuracy and low detection limit, including transient VOC emissions. We propose and test diverse measuring configurations that allow for measurement of VOC emissions from different vertebrates and their exudates: full body, specific parts of the body, urine and femoral pores. In addition, we test configurations for sudden and short-lasting processes as VOCs emitted during adder skin shedding as well as the emissions of skin secretions upon mechanical and physiological stimulation in amphibia. Our configurations work in tandem with Gas Chromatography Mass Spectrometry (GC-MS) to allow compound structure verification.</p> <p>3. We discuss the configurations and methodologies used and conclude with recommendations for further studies, such as the choice of chamber size and flow. We also report the results of the measurements on vertebrates —that are novel to science— and discuss their ecological meaning.</p> <p>4. We argue that PTR-TOF-MS has a high potential to resolve important unanswered questions in vertebrate chemical ecology with great adaptability to a wide range of experimental setups. If combined with a structure verification tool, such as GC-MS, the creative deployment of PTR-TOF-MS in various future study designs will lead to the identification of ecologically relevant VOCs.</p>
Measurement report: Springtime reactive Volatile Organic Compounds (VOCs) and impacts on ozone in urban areas of Yunnan-Guizhou Plateau, China: a PTR-TOF-MS study
<p>Time-varying sequence and day-to-day concentration after treatment. It includes 18 observed major VOCs [acetaldehyde, 2-acrolein, acetone, methyl ethyl ketone (MEK), methyl vinyl ketone (MVK), methacrolein (MACR), methyl isobutyl ketone (MIK), 2-pentanone, ethyl acetate, isoprene, α-pinene, benzene, toluene, styrene, C8 aromatic hydrocarbons, C9 aromatic hydrocarbons, 1,3-dichlorobenzene, naphthalene, and acetonitrile].</p>
Isolation of Volatile Organic Compounds (VOCs) Related to the Olfactory Signature of Breast Cancer. (KDOGCOV)
ClinicalTrials.gov study NCT04541537. IPD Sharing: Not stated. Countries: 1. Publications: 1.
Volatile Organic Compounds (VOCs) Profile in Colorectal Cancer Patients and Healthy Controls.
ClinicalTrials.gov study NCT04217083. IPD Sharing: NO. Countries: 1. Publications: 4.
Lipidomics, Proteomics, Micro RNAs and Volatile Organic Compounds (VOC)
ClinicalTrials.gov study NCT02531607. IPD Sharing: NO. Countries: 1. Publications: 1.
Proton-transfer-reaction time-of-flight mass spectrometry (PTR-TOF-MS) as a tool for studying animal volatile organic compound (VOC) emissions
Open the record for dataset details and reuse information.
ATom: Volatile Organic Compounds (VOCs) from the TOGA instrument, Version 2
This dataset provides concentrations of volatile organic compounds (VOCs) measured by the Trace Organic Gas Analyzer (TOGA) during the four ATom campaigns. These data are relevant to the impact of human-produced air pollution on greenhouse gases and on chemically reactive gases in the atmosphere. Specific data were obtained for radical precursors, tracers of anthropogenic and biogenic activities, tracers of urban and biomass combustion emissions, products of oxidative processing, precursors to aerosol formation, and compounds important for aerosol modification and transformation. TOGA measures a wide range of VOCs with high sensitivity (ppt or lower), frequency (2-minutes), accuracy (often 15% or better), and precision (<3%).
Isolation of Volatile Organic Compounds (VOCs) Related to the Olfactory Signature of Breast Cancer
ClinicalTrials.gov study NCT03703557. IPD Sharing: Not stated. Countries: 1. Publications: 0.
The Role of Volatile Organic Compounds (VOCs), Airway Mucins and the Microbiome in the Early Prediction of Bronchopulmonary Dysplasia (BPD)
ClinicalTrials.gov study NCT06342752. IPD Sharing: NO. Countries: 1. Publications: 0.
Volatile Organic Compounds (VOCs) and Liver Diseases
ClinicalTrials.gov study NCT01279356. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Assessment of Volatile Organic Compounds (VOC) for the Diagnosis of Invasive Aspergillosis (IA) in Lung Transplant Recipients
ClinicalTrials.gov study NCT06344117. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Volatile Organic Compounds (VOCs) as a Biomarker in Immune-mediated Pulmonary Arterial Hypertension (PAH)
ClinicalTrials.gov study NCT03819777. IPD Sharing: UNDECIDED. Countries: 1. Publications: 0.
Using Infrared Spectroscopy to Analyze Volatile Organic Compounds (VOCs) in the Breath of Patients With Lung Cancer
ClinicalTrials.gov study NCT06288646. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Volatile Organic Compounds (VOCs) in Active Inflammatory Bowel Disease
ClinicalTrials.gov study NCT04827368. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Testing Spectrosense EVA System for Detection of Breast Cancer by Analyzing Volatile Organic Compounds (VOCs) in Exhaled Air
ClinicalTrials.gov study NCT01849328. IPD Sharing: Not stated. Countries: 1. Publications: 0.
Development of Volatile Organic Compounds (VOC) Analysis as a Potential Diagnostic for Infected and Non-Healing Wounds
ClinicalTrials.gov study NCT05154838. IPD Sharing: NO. Countries: 1. Publications: 0.
The Contribution of Induced Glycolysis to the Exhaled Volatile Organic Compounds' (VOCs) Signature in Lung Cancer
ClinicalTrials.gov study NCT01852838. IPD Sharing: Not stated. Countries: 1. Publications: 0.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.