358 An abatement of the concentration of mycophytes, dust mites, and pollen grains in the indoor environment using an air purifier

2000 ◽  
Vol 105 (1) ◽  
pp. S119
Author(s):  
R ALBERTINI
Keyword(s):  
Indoor Environment ◽  
Pollen Grains ◽  
Dust Mites ◽  
Air Purifier

Feasibility of Ceiling-Mounted Assist Device of Air-Purifier for Removal of Airborne Allergic Pollen Grains

2015 ◽  
Vol 643 ◽  
pp. 205-208
Author(s):  
Toshiki Takahashi ◽  
Akinori Hashimoto ◽  
Shunsuke Tokoi ◽  
Makoto Goto
Keyword(s):  
Turbulent Flow ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Particle Tracking ◽  
Pollen Grains ◽  
Allergenic Pollen ◽  
Assist Device ◽  
Flow Calculation ◽  
Pollen Removal ◽  
Air Purifier

Feasibility of a ceiling-mounted assist device of the air-purifier for removal of airborne allergenic pollen grains is investigated by both turbulent flow and particle-tracking calculations. The device is mounted straight above the air-purifier and it collects suspended pollen grains in the exhaust flow of the air-purifier. It is found from the turbulent flow calculation that the flow rate of the assist device should be larger than that of the air-purifier. Otherwise the upward air flows around the assist device, and pollen grains move along the surrounding flow; they are never removed from the air. We also found about 40% improvement of the pollen removal efficiency by installing the assist device.

scholarly journals Sensitization and Geographical Distribution of Main Aeroallergens in Iran

2018 ◽  
Author(s):  
Fardis Teifoori ◽  
Idoia Postigo ◽  
Mohammad Abtahi ◽  
Mehdi Dehghani ◽  
Jorge Martinez
Keyword(s):  
Environmental Factors ◽  
House Dust ◽  
Pollen Grains ◽  
House Dust Mites ◽  
Allergic Reactions ◽  
Preventive Strategies ◽  
Dust Mites ◽  
Animal Dander ◽  
Allergic Disorders ◽  
Ubiquitous Presence

Aeroallergens are one of the most important environmental factors that induce allergic reactions in sensitized population. Pollen grains, molds, house dust mites, and animal dander are of major concern because of their abundant sources and ubiquitous presence in environments. Identifying the allergens in geographical areas plays an important role in the diagnosis; prevention and management of allergic disorders. Here, we discussed the most common aeroallergens in Iran and suggested appropriate preventive strategies to decrease the morbidity of allergic patients. The sensitivity to the most common aeroallergens affecting Iranian population is summarized in Table 1. Further delineation of these factors is provided below

scholarly journals Effect of Activated Charcoal Fibers on the Survival of the House Dust Mite, Dermatophagoides pteronyssinus: A Pilot Study

ISRN Allergy ◽  
2012 ◽  
Vol 2012 ◽  
pp. 1-3
Author(s):  
Hae-Seon Nam ◽  
Sun-Hwa Lee ◽  
Young-Jin Choi ◽  
Joon-Soo Park ◽  
Moon-Kyun Cho ◽  
...  
Keyword(s):  
Home Environment ◽  
House Dust ◽  
House Dust Mite ◽  
Activated Charcoal ◽  
Indoor Environment ◽  
Room Temperature ◽  
Dermatophagoides Pteronyssinus ◽  
House Dust Mites ◽  
Dust Mites ◽  
Dust Mite

House dust mites produce potent allergens that exacerbate asthma in sensitized patients, whom are recommended to practice allergen avoidance within their home environment. We tested the effect of activated charcoal impregnated fibers on house dust mite survival. One hundred live adult house dust mites (Dermatophagoides pteronyssinus) were added to eight culture dishes preequilibrated at room temperature () and 70% humidity () containing house dust mite food and active charcoal fibers. At 10 minute intervals, live and dead house dust mites were counted. All house dust mites instantly attached to the activated charcoal fibers and started to shrink almost immediately. There were no live house dust mites present as early as 40 minutes in some dishes while after 190 minutes all house dust mites were dead. In conclusion, activated charcoal fibers, if incorporated into bedding items, have the potential to control house dust mites in the indoor environment.

scholarly journals Dust Mites Population in Indoor Houses of Suspected Allergic Patients of South Assam, India

ISRN Allergy ◽  
2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Dhruba Sharma ◽  
B. K. Dutta ◽  
A. B. Singh
Keyword(s):  
Relative Humidity ◽  
Environmental Factors ◽  
Indoor Environment ◽  
Economic Status ◽  
Indoor Dust ◽  
Study Quality ◽  
Dust Mites ◽  
Standard Methods ◽  
Skin Allergy ◽  
History Of

Background. In the present study, quality and quantity of indoor dust mites was evaluated at the residence of 150 atopic allergic patients from four different districts of South Assam. Methods. Suspected patients with case history of allergic disease were selected for indoor survey. Dust samples (500 mg) were collected from the selected patient's house and were analyzed using standard methods. Results. About 60% of the selected patients were found suffering from respiratory disorders and rest 40% from skin allergy. The dominant mites recorded from indoor dust samples were Dermatophagoides followed by Blomia, Acarus, and Cheyletus while Caloglyphus was recorded in least number. The distribution of mites on the basis of housing pattern indicates that RCC type of buildings supports maximum dust mite's population followed by Assam type (semi-RCC) buildings, and the lowest count was observed in wooden houses. Environmental factors like temperature, rainfall, and relative humidity are found to determine the indoor mite's population. Severity of allergic attack in some of the typical cases was found to be proportional to the allergen load of mites in the dust samples. Conclusions. The economic status, housing pattern, and local environmental factors determine the diversity and abundance of dust mites in indoor environment.

scholarly journals Simulation of indoor air flow created by an air purifier and particle tracking calculation for pollen grains

2012 ◽  
Vol 15 (2) ◽  
pp. 147-161 ◽  
Author(s):  
Akinori HASHIMOTO ◽  
Toshiki TAKAHASHI ◽  
Kensaku MATSUMOTO ◽  
Ken-ichi UZAKI
Keyword(s):  
Indoor Air ◽  
Particle Tracking ◽  
Air Flow ◽  
Pollen Grains ◽  
Air Purifier ◽  
Indoor Air Flow

scholarly journals Efficiency of Air Purifiers at Removing Air Pollutants in Educational Facilities: A Preliminary Study

2021 ◽  
Vol 9 ◽  
Author(s):  
Ewa Brągoszewska ◽  
Izabela Biedroń
Keyword(s):  
Air Pollutants ◽  
Indoor Environment ◽  
Cold Season ◽  
Educational Facilities ◽  
Air Contamination ◽  
Air Purifier ◽  
Preliminary Study ◽  
Microbiological Pollutants ◽  
Bacterial Aerosols ◽  
Gram Positive Cocci

Infectious diseases caused by airborne bacteria and viruses are a major problem for both social and economic reasons. The significance of this phenomenon is particularly noticeable during the time of the coronavirus pandemic. One of the consequences is the increased interest in the air purifier (AP) market, which resulted in a significant increase in sales of these devices. In this study, we tested the efficiency of APs in removing bacterial air contamination in the educational context in the Upper Silesia region of Poland during the “cold season” of 2018/2019. During the 6 months of measuring microbiological air quality, an 18% decrease in the concentration of microbiological pollutants as a result of the action of the APs was recorded. Additionally, the results of the particle size distribution of the bacterial aerosols showed a reduction in the share of the respirable fraction (particles with an aerodynamic diameter below 3.3 µm) by an average of 20%. The dominance of gram-positive cocci in the indoor environment indicates that humans are the main source of most of the bacteria present in the building. We conclude that the use of APs may significantly decrease the level of concentration of microbiological air pollutants and reduce the negative health effects of indoor bioaerosols; however, further work that documents this phenomenon is needed.

scholarly journals Indoor Comfort and Symptomatology in Non-University Educational Buildings: Occupants’ Perception

Atmosphere ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 357 ◽  
Author(s):  
Miguel Ángel Campano-Laborda ◽  
Samuel Domínguez-Amarillo ◽  
Jesica Fernández-Agüera ◽  
Ignacio Acosta
Keyword(s):  
Indoor Environment ◽  
Co2 Concentration ◽  
Traditional Schools ◽  
Southern Europe ◽  
Thermal Systems ◽  
Concentration Variance ◽  
Air Purifier ◽  
Youth Population ◽  
Indoor Comfort ◽  
University Classrooms

The indoor environment in non-university classrooms is one of the most analyzed problems in the thermal comfort and indoor air quality (IAQ) areas. Traditional schools in southern Europe are usually equipped with heating-only systems and naturally ventilated, but climate change processes are both progressively increasing average temperatures and lengthening the warm periods. In addition, air renewal is relayed in these buildings to uncontrolled infiltration and windows’ operation, but urban environmental pollution is exacerbating allergies and respiratory conditions among the youth population. In this way, this exposure has a significant effect on both the academic performance and the general health of the users. Thus, the analysis of the occupants’ noticed symptoms and their perception of the indoor environment is identified as a potential complementary tool to a more comprehensive indoor comfort assessment. The research presents an analysis based on environmental sensation votes, perception, and indoor-related symptoms described by students during lessons contrasted with physical and measured parameters and operational scenarios. This methodology is applied to 47 case studies in naturally ventilated classrooms in southern Europe. The main conclusions are related to the direct influence of windows’ operation on symptoms like tiredness, as well as the low impact of CO2 concentration variance on symptomatology because they usually exceeded recommended levels. In addition, this work found a relationship between symptoms under study with temperature values and the environmental perception votes, and the special impact of the lack of suitable ventilation and air purifier systems together with the inadequacy of current thermal systems.

Resolution of Channels in the Exine by Translocation of Colloidal Iron

1971 ◽  
Vol 29 ◽  
pp. 352-353
Author(s):  
John R. Rowley
Keyword(s):  
Phosphate Buffer ◽  
Pollen Development ◽  
Osmium Tetroxide ◽  
Pollen Grains ◽  
Deionized Water ◽  
Colloidal Iron ◽  
Fixed Material ◽  
Epilobium Angustifolium ◽  
Untreated Material ◽  
Microspore Mitosis

The morphology of the exine of many pollen grains, at the time of flowering, is such that one can suppose that transport of substances through the exine occurred during pollen development. Holes or channels, microscopic to submicroscopic, are described for a large number of grains. An inner part of the exine of Epilobium angustifolium L. and E. montanum L., which may be referred to as the endexine, has irregularly shaped channels early in pollen development although by microspore mitosis there is no indication of such channeling in chemically fixed material. The nucleus in microspores used in the experiment reported here was in prophase of microspore mitosis and the endexine, while lamellated in untreated grains, did not contain irregularly shaped channels. Untreated material from the same part of the inflorescence as iron treated stamens was examined following fixation with 0.1M glutaraldehyde in cacodylate-HCl buffer at pH 6.9 (315 milliosmoles) for 24 hrs, 4% formaldehyde in phosphate buffer at pH 7.2 (1,300 milliosmoles) for 12 hrs, 1% glutaraldehyde mixed with 0.1% osmium tetroxide for 20 min, osmium tetroxide in deionized water for 2 hrs and 1% glutaraldehyde mixed with 4% formaldehyde in 0.1M cacodylate-HCl buffer at pH 6.9 for two hrs.

Freeze-substitution of rye grass and ragweed pollen grains

1990 ◽  
Vol 48 (3) ◽  
pp. 686-687
Author(s):  
Liza B. Martinez ◽  
Susan M. Wick
Keyword(s):  
Cell Function ◽  
Pollen Grains ◽  
Freeze Substitution ◽  
Cell Types ◽  
Rapid Freezing ◽  
Rye Grass ◽  
Acrylic Resins ◽  
Allergenic Proteins ◽  
Cold Embedding ◽  
Structural Preservation

Rapid freezing and freeze-substitution have been employed as alternatives to chemical fixation because of the improved structural preservation obtained in various cell types. This has been attributed to biomolecular immobilization derived from the extremely rapid arrest of cell function. These methods allow the elimination of conventionally used fixatives, which may have denaturing or “masking” effects on proteins. Thus, this makes them ideal techniques for immunocytochemistry, in which preservation of both ultrastructure and antigenicity are important. These procedures are also compatible with cold embedding acrylic resins which are known to increase sensitivity in immunolabelling.This study reveals how rapid freezing and freeze-substitution may prove to be useful in the study of the mobile allergenic proteins of rye grass and ragweed. Most studies have relied on the use of osmium tetroxide to achieve the necessary ultrastructural detail in pollen whereas those that omitted it have had to contend with poor overall preservation.

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