Seasonal variations of airborne bacteria in the Mogao Grottoes, Dunhuang, China

Wang, Wanfu; Ma, Yantian; Ma, Xu; Wu, Fasi; Ma, Xiaojun; An, Lizhe; Feng, Huyuan

doi:10.1016/j.ibiod.2010.03.004

Cited by 60 publications

(33 citation statements)

References 39 publications

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“…However, Aydogdu et al (2010) reported that no significant difference of bacterial concentration was observed in child day-care centers in Edirne city in a year. In Mogao Grottoes, higher bacterial concentration in the air was found in Summer than in Winter in the semi-closed cave and entrance (Wang et al, 2010). All of these differences in seasonal variation pattern of bacterial concentration in different regions might be resulted by geographical and environmental conditions.…”

Section: Discussionmentioning

confidence: 92%

“…Recently, many studies about bacterial investigation in the air have been carried out in such indoor environments as crowded and underground public concourse in Tokyo (Seino et al, 2005), public buildings of Korea (Kim and Kim, 2007), feedstuff-manufacturing factories (Kim et al, 2009), child day-care centers in Edirne city (Aydogdu et al, 2010), Mogao Grottoes (Wang et al, 2010), Polish libraries and archives (Karbowska-Berent et al, 2011), and occupied classroom (Qian et al, 2012). Our study indicated that airborne gram positive bacteria, accounting for about 94.6%, were dominated in residential homes, which was in agreement with other reports (Zhu et al, 2003;Awad, 2007;Aydogdu et al, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…However, since the superposition is unavoidable when the microbial particles impact the same spot through the same sieve pore (Wang et al, 2010), the colonies collected were revised by Eq. (1).…”

Section: Bacterial Concentration Determinationmentioning

confidence: 99%

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Characteristic and Concentration Distribution of Culturable Airborne Bacteria in Residential Environments in Beijing, China

Fang

Gong

Ouyang

et al. 2014

Aerosol Air Qual. Res.

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The present investigation was conducted to assess the culturable concentration and distribution characteristics of airborne bacteria in 31 homes with children aged from 1 to 10 years in Beijing, China. The results showed that the concentration of culturable airborne bacteria in these homes ranged from 47 colony forming units (CFU)/m 3 to 12341 CFU/m 3 , with a mean and a median of 1821 and 877 CFU/m 3 , respectively. A total of 632 bacterial isolates from the air in homes in different regions and different seasons were identified and distributed across 43 genera and 136 species of bacteria. Micrococcus (26.74%), Bacillus (14.56%), Kocuria (12.66%), and Staphylococcus (12.03%) were determined as the most common culturable airborne bacteria, and the dominant bacterial species were Micrococcus luteus (14.56%), Kocuria roseus (8.39%), Bacillus megaterium (4.75%), Staphylococcus cohnii (3.63%), and Micrococcus lylae (3.01%). Data analysis revealed that bacterial concentrations in homes with a male child were significantly higher than those with a female child (**P < 0.01), and a negative correlation was found between bacterial concentration and living area per person in the homes (**P < 0.01). Additionally, the mean bacterial concentration was highest in Spring, followed by Summer and Autumn, and lowest in Winter (**P < 0.01) in homes with child. The results provide an exposure database of airborne bacteria in family homes in Beijing, and suggest that the sex of children and living area per person in homes have a significant influence on the bacterial concentration in the air.

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Section: Discussionmentioning

confidence: 92%

Section: Discussionmentioning

confidence: 99%

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Characteristic and Concentration Distribution of Culturable Airborne Bacteria in Residential Environments in Beijing, China

Fang

Gong

Ouyang

et al. 2014

Aerosol Air Qual. Res.

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“…However, such studies face significant challenges due to the broad diversity and tremendous variability in populations of airborne bacteria owing to different sources of origin, seasonal effects, local climate differences, weather patterns, local human activities, and local wind currents (Shaffer and Lighthart, 1997). In the past decades, many studies on the composition and distribution of airborne bacteria emerged around the world (Bovallius et al, 1978;Mancinelli and Shulls, 1978;Jones and Cookson, 1983;Lighthart and Kin, 1989;Lighthart and Shaffer, 1995;Lighthart, 1997;Seino et al, 2005;Abdel Hameed, et al, 2009;Houdt et al, 2009;Lee et al, 2010;Wang et al, 2010;Yassin and Almouqatea, 2010;Nasir et al, 2012). These investigations significantly enriched our baseline knowledge of the normal abundance, distribution and composition of bacteria in the atmosphere, and which has supported many applications related to public health and international security.…”

Section: Introductionmentioning

confidence: 99%

Profile and Characteristics of Culturable Airborne Bacteria in Hangzhou, Southeast of China

Fang¹,

Yao²,

Lou³

et al. 2016

Aerosol Air Qual. Res.

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Increased concentrations of airborne bacteria are known to be associated with decreased public health. As such, we evaluated the culturable concentration and distribution characteristics of airborne bacteria at four sampling sites in Hangzhou, southeast China. Results showed that the concentration of culturable bacteria in the air at selected sampling sites ranged from < 12 colony forming units (CFU) m -3 to 3259 CFU m -3 with a mean and a median of 292 and 201 CFU m -3 , respectively. We identified a total of 789 airborne bacterial isolates from multiple sampling sites and between different seasons, which distributed across 55 genera and 184 species of bacteria. Micrococcus (16.48%), Bacillus (13.94%), Staphylococcus (11.28%), Kocuria (11.28%), and Pseudomonas (4.94%) accounted for 58% of the total species and the dominant bacterial species were Micrococcus luteus (9.51%), Kocuria roseus (6.84%), Bacillus megaterium (4.56%), Micrococcus roseus (3.42%), and Staphylococcus cohnii (2.53%). Significant variation between sampling sites was observed with significantly higher bacterial concentrations detected at Yan'an Road Business Street (YRBS), followed by Tianmushan and Jiaogong Cross Road (TJCR) and Zhejiang Gongshang University Jiaogong Campus (ZJGSUJC), while the lowest concentrations were found at Breeze-ruffled Lotus at Quyuan Garden (BLQG) (p < 0.05). Moreover, seasonal variation of bacterial concentrations was observed across the different sampling sites: the highest bacterial concentrations in both YRBS and ZJGSUJC were found in autumn, followed by spring, and the lowest was found in winter (p < 0.05). No significant differences in seasonal patterns were found in BLQG (p > 0.05). Taken together these results provide a baseline for airborne culturable bacteria in southeast China, and will enable evaluation of the risks to human health from exposure to the atmosphere in the region.

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“…Interesting data were presented by Wang et al (2010) who examined the seasonal variations of airborne bacteria found in the Mogao Grottoes, Dunhuang, China. However, their limitation lies in their location of the sampler which was mounted at 1.5 m above the ground level.…”

Section: Introductionmentioning

confidence: 99%

Identification of Culturable Bioaerosols Collected over Dryland in Northwest China: Observation using a Tethered Balloon

Chen¹,

Kobayashi²,

Yamada³

et al. 2011

Asian J. Atmos. Environ

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The transfer of microorganisms is important process for ecosystems. Microorganisms in dryland can transport itself to wetland through atmospheric diffusion, but only few papers reported about the atmospheric bioaerosol present over dryland. We carried out the direct sampling using a tethered balloon over Dunhuang City, China's northwestern dryland. Bioaerosols were collected using a tethered balloon with a bioaerosol collector at 820 m above the ground (1,960 m above the sea level) around noon on August 17, 2007. The bioaerosols were cultured after the collection at Dunhuang Meteorological observatory. Two strains of molds were isolated using the Nutrient agar medium. About 400-bp 18S rRNA partial sequences were amplified by PCR and determined afterwards. The results of a homology search by 18S rRNA sequences of isolates in DNA databases (GenBank, DDBJ, and EMBL) and an observation of the form revealed that two bioaerosols in the convective mixed layer over Dunhuang City were Cladosporium sp. and Aspergillus sp.

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Seasonal variations of airborne bacteria in the Mogao Grottoes, Dunhuang, China

Cited by 60 publications

References 39 publications

Characteristic and Concentration Distribution of Culturable Airborne Bacteria in Residential Environments in Beijing, China

Characteristic and Concentration Distribution of Culturable Airborne Bacteria in Residential Environments in Beijing, China

Profile and Characteristics of Culturable Airborne Bacteria in Hangzhou, Southeast of China

Identification of Culturable Bioaerosols Collected over Dryland in Northwest China: Observation using a Tethered Balloon

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