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Meteorological Influences on Respirable Fragment Release from Chinese Elm Pollen

Miguel, Ann G. and Taylor, Philip E. and House, James and Glovsky, M. Michael and Flagan, Richard C. (2006) Meteorological Influences on Respirable Fragment Release from Chinese Elm Pollen. Aerosol Science and Technology, 40 (9). pp. 690-696. ISSN 0278-6826. https://resolver.caltech.edu/CaltechAUTHORS:20150818-105520674

[img] Video (QuickTime) (Video SI. Video light microscopy of Chinese elm pollen after it was immersed in water and showing the release of fragments of cytoplasm as well as the two sperm cells. This video in real time, covers 20.1 sec, and is played at 12 fps) - Supplemental Material
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[img] Video (AVI) (Video SI. Video light microscopy of Chinese elm pollen after it was immersed in water and showing the release of fragments of cytoplasm as well as the two sperm cells. This video in real time, covers 20.1 sec, and is played at 12 fps) - Supplemental Material
See Usage Policy.

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Abstract

Exposure to airborne pollen from certain plants can cause allergic disease, leading to acute respiratory symptoms. Whole pollen grains, 15–90 µm-sized particles, provoke the upper respiratory symptoms of rhinitis (hay fever), while smaller pollen fragments capable of depositing in the lower respiratory tract have been proposed as the trigger for asthma. In order to understand factors leading to pollen release and fragmentation we have examined the rupture of Chinese elm pollen under controlled laboratory conditions and in the outdoor atmosphere. Within 30 minutes after immersion in water, 70% of fresh Chinese pollen ruptures, rapidly expelling cytoplasm. Chinese elm flowers, placed in a controlled atmosphere chamber, emitted pollen and pollen debris after a sequential treatment of 98% relative humidity followed by drying and a gentle disturbance. Immunologic assays of antigenic proteins specific to elm pollens revealed that fine particulate material (Dp < 2 µm) collected from the chamber contained elm pollen antigens. In a temporal study of the outdoor urban atmosphere during the Chinese elm bloom season of 2004, peak concentrations of pollen and fine pollen fragments occurred at the beginning of the season when nocturnal relative humidity (RH) exceeded 90%. Following later periods of hot dry weather, pollen counts decreased to zero. The Chinese elm pollen fragments also decreased during the hot weather, but later displayed additional peaks following periods of more moderate RH and temperature, indicating that pollen counts underestimate total atmospheric pollen allergen concentrations. Pollen fragments thus increase the biogenic load in the atmosphere in a form that is no longer recognizable as pollen and, therefore, is not amenable to microscopic analysis. This raises the possibility of exposure of sensitive individuals to pollen allergens in the form of fine particles that can penetrate into the lower airways and pose potentially severe health risks.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1080/02786820600798869DOIArticle
http://www.tandfonline.com/doi/abs/10.1080/02786820600798869PublisherArticle
ORCID:
AuthorORCID
Flagan, Richard C.0000-0001-5690-770X
Additional Information:© 2006 American Association for Aerosol Research. Received 8 December 2005; accepted 9 March 2006. We would like to thank Robert Esch of Greer Laboratories, Lenoir, NC, for his kind gift of rabbit anti-American elm pollen antibody used for the detection of elm antigens. This work was supported by Philip Morris USA, Inc., Philip Morris International, and the Southern California Environmental Health Sciences Center (NIEHS grant number 5P30 ES07048). P.T. was supported by a Boswell Fellowship from HMRI and Caltech.
Funders:
Funding AgencyGrant Number
Philip Morris USAUNSPECIFIED
Philip Morris InternationalUNSPECIFIED
Southern California Environmental Health Sciences CenterUNSPECIFIED
NIEHS5P30 ES07048
Huntington Medical Research Institute (HMRI)UNSPECIFIED
CaltechUNSPECIFIED
Issue or Number:9
Record Number:CaltechAUTHORS:20150818-105520674
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20150818-105520674
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:59720
Collection:CaltechAUTHORS
Deposited By: Irina Meininger
Deposited On:19 Aug 2015 22:07
Last Modified:03 Oct 2019 08:49

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