Impact of Asian dust events on airborne bacterial community assessed by molecular analyses

Jeon, Eun Mi; Kim, Heung Joo; Jung, Kyomin; Kim, Joo Hyung; Kim, Min Young; Kim, Yong Pyo; Ka, Jong-Ok

doi:10.1016/j.atmosenv.2010.11.054

Cited by 142 publications

(93 citation statements)

References 27 publications

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“…The staining method can stain all bacterial cells, dead or alive, thus adequately reflecting the actual bacterial concentrations in the ambient environment. However, this method cannot identify the component species in samples, in contrast to the molecular-based method (Jeon et al, 2011). Compared with a similar study conducted in Colorado, USA, by Bowers et al (2010), who evaluated the spatial variations of ambient bacterial concentrations among 3 land-use types, the bacterial concentrations determined in our study were approximately 10 to 100 times lower; this could have been due to the varying characteristics of the sampling sites.…”

Section: Discussioncontrasting

confidence: 43%

“…However, outdoor exposure is also crucial. Studies have indicated that bacterial and endotoxin concentrations vary among different types of outdoor environment, with considerable seasonal variations as well (Mueller-Anneling et al, 2004;Morgenstern et al, 2005;Bowers et al, 2010;Tager et al, 2010;Jeon et al, 2011;Bowers et al, 2012;Haas et al, 2013;Woo et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

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Spatiotemporal Distributions and Land-Use Regression Models of Ambient Bacteria and Endotoxins in the Greater Taipei Area

Kallawicha

Lung

Chuang

et al. 2015

Aerosol Air Qual. Res.

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Ambient bacteria and endotoxins are components of bioaerosols, which are abundant in ambient air. Exposure to ambient bacteria and endotoxins has been associated with respiratory symptoms. We monitored the spatiotemporal distributions of ambient bioaerosols in the Greater Taipei area by using multisite sampling and developed regression models for ambient bacterial and endotoxin concentrations. Forty-four representative sampling sites were selected from the Greater Taipei area. Samples were collected in 4 seasons throughout a 1-y study period. Ambient bacteria were quantified using acridine orange staining, and endotoxins were analyzed using Limulus amebocyte lysate assays. Land-use types and major determinants of the bioaerosols were used to develop regression models. Ambient bacteria ranged from < limit of detection (LOD) to 1.68 × 10 5 cells/m 3 , whereas endotoxins ranged from < LOD to 20.62 EU/m 3 . Significant seasonal variations were observed for both bioaerosols, with the highest concentrations observed in spring. Regression analyses revealed temperature, relative humidity, and particulate matter as the major predictors of ambient bacteria and endotoxins. No land-use type was correlated with any of the bioaerosols. The number of schools and gas stations was positively associated with both bioaerosols. The leave-one-out cross-validation R 2 of the final models for ambient bacteria and endotoxins were 0.11 and 0.31, respectively. The results of this study revealed high spatiotemporal variations in the distributions of ambient bacteria and endotoxins in the Greater Taipei area. Additional potential predictors should be included in future studies to develop better predictive models for ambient bacteria and endotoxins.

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Section: Discussioncontrasting

confidence: 43%

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Distributions and Land-Use Regression Models of Ambient Bacteria and Endotoxins in the Greater Taipei Area

Kallawicha

Lung

Chuang

et al. 2015

Aerosol Air Qual. Res.

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“…3 and 4a). Some clones recovered from the 3 air samples were identical to B. subtilis, which were detected at high altitudes above the Taklamakan Desert (Maki et al, 2008) and were associated with the Asian dust mineral particles collected in downwind areas (Maki et al, 2010;Jeon et al, 2011;Tanaka et al, 2011;Maki et al, 2014;Fig. 4a).…”

Section: Bacterial Populations Associated With Dust Eventsmentioning

confidence: 99%

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Maki

Hara

Kobayashi

et al. 2015

Atmospheric Environment

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Bioaerosols at high altitudes were collected using an aircraft and a balloon.Pyrosequencing using 16S rDNA revealed vertical distributions of airborne bacteria.16S rDNA clone libraries suggested the transport of terrestrial and marine bacteria.Meteorological conditions contribute to vertical variations in airborne bacteria. 3 AbstractBacterial populations transported from ground environments to the atmosphere get dispersed throughout downwind areas and can influence ecosystem dynamics, human health, and climate change. However, the vertical bacterial distribution in the free troposphere was rarely investigated in detail. We collected aerosols at altitudes of 3,000 m, 1,000 m, and 10 m over the Noto Peninsula, Japan, where the westerly winds carry aerosols from continental and marine areas. During the sampling period on March 10, 2012, the air mass at 3,000 m was transported from the Chinese desert region by the westerly winds, and a boundary layer was formed below 2,000 m. Pyrosequencing targeting 16S rRNA genes (16S rDNA) revealed that the bacterial community at 3,000 m was predominantly composed of terrestrial bacteria, such as Bacillus and Actinobacterium species. In contrast, those at 1,000 m and 10 m included marine bacteria belonging to the classes Cyanobacteria and Alphaproteobacteria. The entire 16S rDNA sequences in the clone libraries were identical to those of the terrestrial and marine bacterial species, which originated from the Chinese desert region and the Sea of Japan, respectively. The origins of air masses and meteorological conditions contribute to vertical variations in the bacterial communities in downwind atmosphere.

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“…Back trajectories on 19 March 2013 and 20 March 2015 came from the Asian desert region to the Noto Peninsula. Some Bacillus species were predominantly detected at high altitudes above the Taklamakan Desert (Maki et al, 2008) and above downwind areas during Asian dust events (Maki et al, 2010(Maki et al, , 2013Smith et al, 2013;Jeon et al, 2011;Tanaka et al, 2011) (Table 2). Bacillus species are the most prevalent isolates obtained from mineral dust particles collected over downwind areas (Hua et al, 2007;Gorbushina et al, 2007).…”

Section: Dominant Bacterial Populations In the Air Masses Transportedmentioning

confidence: 99%

“…Dust events and air pollutant occurrences changed the airborne bacterial communities over the downwind areas, such as Beijing (Jeon et al, 2011;Cao et al, 2014) (Table 2) and eastern Mediterranean areas (Mazar et al, 2016). The westerly winds blowing over East Asia would transport airborne bacteria to the high-altitude atmosphere over the Noto Peninsula and North American mountains (Smith et al, 2013).…”

Section: Comparing the Community Structures Of Atmospheric Bacteria Bmentioning

confidence: 99%

Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events

et al. 2017

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Abstract. Aerosol particles, including airborne microorganisms, are transported through the free troposphere from the Asian continental area to the downwind area in East Asia and can influence climate changes, ecosystem dynamics, and human health. However, the variations present in airborne bacterial communities in the free troposphere over downwind areas are poorly understood, and there are few studies that provide an in-depth examination of the effects of long-range transport of aerosols (natural and anthropogenic particles) on bacterial variations. In this study, the vertical distributions of airborne bacterial communities at high altitudes were investigated and the bacterial variations were compared between dust events and non-dust events.

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Impact of Asian dust events on airborne bacterial community assessed by molecular analyses

Cited by 142 publications

References 27 publications

Spatiotemporal Distributions and Land-Use Regression Models of Ambient Bacteria and Endotoxins in the Greater Taipei Area

Spatiotemporal Distributions and Land-Use Regression Models of Ambient Bacteria and Endotoxins in the Greater Taipei Area

Vertical distribution of airborne bacterial communities in an Asian-dust downwind area, Noto Peninsula

Variations in airborne bacterial communities at high altitudes over the Noto Peninsula (Japan) in response to Asian dust events

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