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Sökning: WFRF:(Roldan Nestor)

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1.
  • Grewling, L., et al. (författare)
  • Outdoor airborne allergens: Characterization, behavior and monitoring in Europe
  • 2023
  • Ingår i: SCIENCE OF THE TOTAL ENVIRONMENT. - 0048-9697. ; 905
  • Tidskriftsartikel (refereegranskat)abstract
    • Aeroallergens or inhalant allergens, are proteins dispersed through the air and have the potential to induce allergic conditions such as rhinitis, conjunctivitis, and asthma. Outdoor aeroallergens are found predominantly in pollen grains and fungal spores, which are allergen carriers. Aeroallergens from pollen and fungi have seasonal emission patterns that correlate with plant pollination and fungal sporulation and are strongly associated with atmospheric weather conditions. They are released when allergen carriers come in contact with the respiratory system, e.g. the nasal mucosa. In addition, due to the rupture of allergen carriers, airborne allergen molecules may be released directly into the air in the form of micronic and submicronic particles (cytoplasmic debris, cell wall fragments, droplets etc.) or adhered onto other airborne particulate matter. Therefore, aeroallergen detection strategies must consider, in addition to the allergen carriers, the allergen molecules themselves. This review article aims to present the current knowledge on inhalant allergens in the outdoor environment, their structure, localization, and factors affecting their production, transformation, release or degradation. In addition, methods for collecting and quantifying aeroallergens are listed and thoroughly discussed. Finally, the knowledge gaps, challenges and implications associated with aeroallergen analysis are described.
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3.
  • Werchan, B., et al. (författare)
  • Two-hour Alternaria spore concentra- tions at one urban and one rural monitoring station in Germany
  • 2023
  • Ingår i: ALLERGOLOGIE. - 0344-5062. ; 46:9, s. 612-616
  • Forskningsöversikt (refereegranskat)abstract
    • Alternaria spores can cause allergic rhi-noconjunctivitis and asthma. Monitoring of Alternaria spores in outdoor air is one of the bases for providing information to affected persons and attending physicians as well as for forecasting. Concentrations of Alternar-ia spores in outdoor air were continuously monitored with volumetric traps (Hirst prin-ciple) between 2017 and 2019 at two sites - in the city (Berlin) and in the countryside (Borstel) - both as daily averages and with detailed temporal resolution of 2-hour aver-ages. Both in the city and in the countryside, the occurrence of Alternaria spores during the years was concentrated in the months of July and August. The concentrations summed up for the respective 2-hour peri-ods in the course of the day over the entire monitoring period were highest in Borstel between 6 p.m. and 8 p.m. and in Berlin between 10 p.m. and midnight. The diurnal variations of the concentrations were clearly more pronounced in the countryside than in the city. This study extends the knowledge of the possible temporal pattern of high and low Alternaria spore loads in outdoor air in Germany.
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