Highly sensitive reflection based colorimetric gas sensor to detect CO in realistic fire scenarios

Publication date: Available online 12 December 2019Source: Sensors and Actuators B: ChemicalAuthor(s): C. Pannek, T. Vetter, M. Oppmann, C. Weber, A. Eberhardt, M. Dold, M.-L. Bauersfeld, M. Henfling, S. Trupp, B. Schug, J. Wöllenstein, K. MandelAbstractFor early fire detection, the measurement of low and small rising concentrations of the fire typical gas carbon monoxide (CO) is essential. The approach presented herein integrates a highly sensitive colorimetric material into a low cost gas sensor system. The gas sensitive color dye is hosted by silica nanoparticle based supraparticles and then processed to a so-called gas sensor stripe. Changes in the CO concentration enable a change of the sensor stripes color, which is easily detectable as a change of the light that is reflected by the stripe. A diffusion chamber protects the gas sensitive film against harmful environmental influences and interfering light. The capability of the gas sensor system is demonstrated in lab as well as real fire tests. In case of the latter, standardized real fire tests are conducted, as well as realistic mixtures of plastics and wood are smoldered. The developed sensors react in real time to the slowly rising CO concentration during the test fires. Even small amounts of CO (
Source: Sensors and Actuators B: Chemical - Category: Chemistry Source Type: research

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AbstractPurposeTo explore neuropathologic mechanisms in functional brain regions in patients with delayed encephalopathy after carbon monoxide poisoning (DEACMP) from the perspective of the brain network nodes by resting-state functional magnetic resonance imaging (rs-fMRI).MethodsThe fMRI and cognitive assessments were performed in 25 patients with DEACMP and 25 age-, sex- and education-matched healthy controls (HCs). Data analysis was performed via the degree centrality (DC) method. Then, the associations between the cognitive assessments and DC in the identified abnormal brain regions were assessed by using a correlatio...
Source: Neuroradiology - Category: Radiology Source Type: research
ConclusionsThe PMI was significantly associated with the survival of lung SCC patients, but not of lung ADC patients, suggesting the presence of a previously unidentified relationship between skeletal muscle and lung SCC progression.
Source: International Journal of Clinical Oncology - Category: Cancer & Oncology Source Type: research
Conclusion: This analysis provided new information that was previously unavailable in this country. Furthermore, this tool proved to be a valid base for future registry aiming to consolidate the body of knowledge about CO intoxications in Italy.
Source: International Journal of Environmental Research and Public Health - Category: Environmental Health Authors: Tags: Article Source Type: research
The objective of the analysis was to clarify whether the time- and effect-adjusted nonlethal threshold concentration LCt01 × 1/3 from acute rat inhalation studies is suited to model thresholds characterizing any ‘impairment of escape’ in humans. Modeled outcomes are compared with published reference data from human volunteers exposed at the similar C × t's of CO at 800 ppm × 1-h and 100 ppm × 8-h. These exposure durations match the maximum escape duration of 1-h considered in the ISO standard 13571 and standards enforcing occupational exposure limits of 8-h duration. ...
Source: Regulatory Toxicology and Pharmacology - Category: Toxicology Source Type: research
Conclusions: Inflammatory pathways associated with pulmonary dysfunction in PLWH suggest multifaceted immune dysregulation involved in different phenotypes of pulmonary dysfunction with a potential specific contribution of the Th17 pathway to airway obstruction in PLWH. Identification of these associations may help in development of treatments that could alter the course of the disease.
Source: JAIDS Journal of Acquired Immune Deficiency Syndromes - Category: Infectious Diseases Tags: Translational Research Source Type: research
Heme oxygenase (HO)-1 plays an important role during hibernation by catalyzing the degradation of heme to biliverdin/bilirubin, ferrous iron, and carbon monoxide, which activates the protective mechanisms against stress. In this context, it was important to analyze the metabolic processes of heme. Nevertheless, to date, no study has approached on biosynthesis of heme. Therefore, our study aims to understand the process of heme biosynthesis, which regulates cell survival in conditions of hypothermia and calorie restriction (CR). During hibernation, the mRNA levels of enzymes responsible for de novo heme biosynthesis were in...
Source: Frontiers in Physiology - Category: Physiology Source Type: research
oxford Background: Carbon monoxide (CO) poisoning is an important public health issue around the world. Research indicates that many factors may be related to the rate of CO uptake and elimination in the human body. However, some factors related to CO uptake and elimination are considered controversial. Relatively little attention has been devoted to review and synthesis of factors affecting CO uptake and elimination. Purpose: This paper provides a critical scoping review of the factors and divides them into four aspects, including environmental, demographic, physiological and treatment factors. Methods: We searched th...
Source: International Journal of Environmental Research and Public Health - Category: Environmental Health Authors: Tags: Review Source Type: research
Publication date: Available online 13 January 2020Source: Materials Today: ProceedingsAuthor(s): Ashish Dewangan, Ashis Mallick, Ashok Kumar Yadav, Rajeev KumarAbstractIn transportation sector the most consumption fuel is Diesel. Combustion of diesel fuel in engine causes serious air pollution which includes carbon dioxide (CO2), unburned hydrocarbon (HC), carbon monoxide (CO), nitrogen oxide (NOx) and some particulate matters discharged from the combustion chamber. This emission causes health issues to the human and adversely affects the ecosystem. Several alternative fuels such as dimethyl ether, alcohol, hydrogen and bi...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Carbon monoxide (CO) poisoning occurs due to CO gas which is produced by the incomplete combustion of hydrocarbons. Several causes of CO poisoning have been defined in the literature. The most frequent causes are defective heaters, fires and exposure to ex...
Source: SafetyLit - Category: International Medicine & Public Health Tags: Occupational Issues Source Type: news
Publication date: Available online 9 January 2020Source: Sensors and Actuators B: ChemicalAuthor(s): Claudia gonzalez Viejo, Sigfredo Fuentes, Amruta Godbole, Bryce Widdicombe, Ranjith R UnnithanAbstractThe assessment of aromas in beer is critical to assess its quality since it could be used as an indicator of contamination or faults, which will directly influence consumers’ acceptability. Traditional techniques to evaluate aromas are time-consuming, require special training, costly equipment, and trained personnel. Therefore, this study aimed to develop a portable, low-cost electronic nose (e-nose) coupled with mach...
Source: Sensors and Actuators B: Chemical - Category: Chemistry Source Type: research
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