Diurnal distribution of airborne bacteria and fungi in the atmosphere of Helwan area, Egypt

Hameed, A. A. Abdel; Khoder, Mamdouh I.; Yuosra, S.; Osman, Anas; Ghanem, Samah

doi:10.1016/j.scitotenv.2009.08.028

Cited by 82 publications

(29 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…As shown in Table 5, the wind speed was observed to correlate negatively with N F during the entire measurement period, and is consistent with previously reported studies (Hameed et al, 2012;Almaguer et al, 2013;Lyon et al, 1984;Quintero et al, 2010). The increased N F concentration levels during lower wind speed might indicate that observed bioaerosols were dominated by the local source rather than transported from longer distances (Sadys et al, 2014;Hara and Zhang, 2012;Bovallius et al, 1978;Maki et al, 2013;Prospero et al, 2005;Creamean et al, 2013), as lower wind speed may actually increase emission of some specific type of spores Jones and Harrison, 2004;Troutt and Levetin, 2001;Kurkela, 1997).…”

Section: Impact Of Wind Directionsupporting

confidence: 90%

Fluorescent biological aerosol particle measurements at a tropical high-altitude site in southern India during the southwest monsoon season

Valsan

Ravikrishna

Biju³

et al. 2016

Atmos. Chem. Phys.

View full text Add to dashboard Cite

Abstract. An ultraviolet aerodynamic particle sizer (UV-APS) was continuously operated for the first time during two seasons to sample the contrasting winds during monsoon and winter to characterize the properties of fluorescent biological aerosol particles (FBAPs), at a high-altitude site in India. Averaged over the entire monsoon campaign (1 June–21 August 2014), the arithmetic mean number and mass concentrations of coarse-mode (> 1 µm) FBAPs were 0.02 cm−3 and 0.24 µg m−3, respectively, which corresponded to ∼  2 and 6 % of total aerosol loading, respectively. Average FBAP number size distribution exhibited a peak at ∼  3 µm, which is attributed to the fungal spores, as supported by scanning electron microscope (SEM) images, and these results are consistent with previous studies made for FBAPs. During 11 weeks of measurements the variability of the total coarse-mode particle number (TAP) concentration was high compared to that observed in FBAP number concentrations. The TAP and FBAP number concentrations measured at this site were strongly dependent on changes in wind direction and rainfall. During periods of westerly/southwesterly winds with heavy persistent rainfall, the TAP and FBAP concentrations exhibited very low values (1.3 and 0.005 cm−3, respectively) with no significant diurnal variations, whereas during periods of northerly winds with scattered rainfall FBAPs exhibited relatively high concentration values (0.05 cm−3) with pronounced diurnal variations, which were strongly coupled with diurnal variations in meteorological parameters. The campaign-averaged FBAP number concentrations were shown to correlate with daily patterns of meteorological parameters and were positively correlated with relative humidity (RH; R2  =  0.58) and negatively with temperature (R2  =  0.60) and wind speed (R2  =  0.60). We did not observe any significant positive correlation with precipitation as reported by previous researchers from selected areas. These measurement results confirm the fact that the ratio of PBAPs to TAP is strongly dependent on particle size and location and thus may constitute a significant proportion of total aerosol particles.

show abstract

Section: Impact Of Wind Directionsupporting

confidence: 90%

Fluorescent biological aerosol particle measurements at a tropical high-altitude site in southern India during the southwest monsoon season

Valsan

Ravikrishna

Biju³

et al. 2016

Atmos. Chem. Phys.

View full text Add to dashboard Cite

show abstract

“…That report states that observed spore concentrations increase "sharply around sunset, remaining high throughout the night, and then decline sharply shortly after sunrise". Other groups have reported seeing increases in airborne fungal spore concentrations at night, varying by season and sampling location (e.g., De Groot, 1968;Elbert et al, 2007;Abdel-Hameed et al, 2009). Factors related to emission of PBAP, whether bacteria, fungal spore, or otherwise, are strongly dependent on species, however (e.g., Gilbert, 2005), and many studies have focused on specific phyla or genera.…”

Section: Sources Of Diurnal Patternsmentioning

confidence: 99%

Size distributions and temporal variations of biological aerosol particles in the Amazon rainforest characterized by microscopy and real-time UV-APS fluorescence techniques during AMAZE-08

et al. 2012

View full text Add to dashboard Cite

Abstract. As a part of the AMAZE-08 campaign during the wet season in the rainforest of central Amazonia, an ultraviolet aerodynamic particle sizer (UV-APS) was operated for continuous measurements of fluorescent biological aerosol particles (FBAP). In the coarse particle size range (> 1 µm) the campaign median and quartiles of FBAP number and mass concentration were 7.3×10 4 m −3 (4.0-13.2×10 4 m −3 ) and 0.72 µg m −3 (0.42-1.19 µg m −3 ), respectively, accounting for 24 % (11-41 %) of total particle number and 47 % (25-65 %) of total particle mass. During the five-week campaign in February-March 2008 the concentration of coarsemode Saharan dust particles was highly variable. In contrast, FBAP concentrations remained fairly constant over the course of weeks and had a consistent daily pattern, peaking several hours before sunrise, suggesting observed FBAP was dominated by nocturnal spore emission. This conclusion was supported by the consistent FBAP number size distribution peaking at 2.3 µm, also attributed to fungal spores and mixed biological particles by scanning electron microscopy (SEM), light microscopy and biochemical staining. A second primary biological aerosol particle (PBAP) mode between 0.5 and 1.0 µm was also observed by SEM, but exhibited little fluorescence and no true fungal staining. This mode may have consisted of single bacterial cells, brochosomes, various fragments of biological material, and small Chromalveolata (Chromista) spores. Particles liquid-coated with mixed organic-inorganic material constituted a large fraction of observations, and these coatings contained salts likely from primary biological origin. We provide key support for the suggestion that real-time laser-induce fluorescence (LIF) techniques using 355 nm excitation provide size-resolved concentrations of FBAP as a lower limit for the atmospheric abundance of biological particles in a pristine environment. We also show some limitations of using the instrument for ambient monitoring of weakly fluorescent particles < 2 µm. Our measurements confirm that primary biological particles, fungal spores in particular, are an important fraction of supermicron aerosol in the Amazon and that may contribute significantly to hydrological cycling, especially when coated by mixed inorganic material.

show abstract

“…The concentration of bacteria in the atmosphere, in addition to being influenced by its own environmental factors, is closely related to human activities, such as the flow of people, flow of traffic, etc (Liang et al, 2013). These human activities can result in the flow of dust and small particles in the soil, causing an increase in the concentration of microbial aerosol (Hameed et al, 2009). Changes of airborne bacteria concentration in the research are mainly related to the microenvironmental conditions, sampling time, climatic conditions, and human activities (Fang et al, 2007).…”

Section: Discussionmentioning

confidence: 99%

Seasonal Fluctuations of Microbial Aerosol in Live Poultry Markets and the Detection of Endotoxin

Meng

Wei

et al. 2017

Front. Microbiol.

View full text Add to dashboard Cite

Microbial aerosol whose species and concentrations are closely related to human health is ubiquitous. The effect of microbes on human and animal health and production performance is, in many cases, caused by the spreading of air. Samples in this experiment were from a live poultry market (LPM) in Tai’an, China, collected three times a day (8 am, 14 pm, and 20 pm) over three consecutive days each month for 11 months (Original sampling plan was a year, the government due to the environmental protection, the was LPM closed). The main indicators of the test were concentrations of cultural airborne bacteria, airborne fungi, and Gram-negative bacteria. At the same time the species of Gram-negative bacteria and the concentration of endotoxin were tested. Temperature and humidity were recorded in the process of each sampling. The results showed that the diurnal variation of the concentration of bacteria, fungi, and Gram-negative bacteria is higher in the morning and evening, but lower at noon. The concentrations of airborne bacteria and Gram-negative bacteria increased in earlier months and decreased in later months, with the peak appearing in the autumn. The concentration of fungi showed a decrease first and then tended to stabilize, with the peak occurring in the spring. The concentration peak of endotoxin occurred in the summer. Endotoxin levels were significantly correlated with humidity (r = 0.90, p < 0.01). Most bacteria were distributed at the third and fourth stages (2.1–4.7 μm) in the ANDERSEN-6 sampler. The dominant species of Gram-negative bacteria during the four seasons were Pseudomonas aeruginosa, Acinetobacter, Klebsiella pneumoniae, and Salmonella. In China, people have a habit of eating fresh poultry, LPM distribution is widespread, stream of people and traffic flow are large, easily caused the spread of bacteria and viruses, so the LPM microbial aerosol research have significant public health implications.

show abstract

Diurnal distribution of airborne bacteria and fungi in the atmosphere of Helwan area, Egypt

Cited by 82 publications

References 33 publications

Fluorescent biological aerosol particle measurements at a tropical high-altitude site in southern India during the southwest monsoon season

Fluorescent biological aerosol particle measurements at a tropical high-altitude site in southern India during the southwest monsoon season

Size distributions and temporal variations of biological aerosol particles in the Amazon rainforest characterized by microscopy and real-time UV-APS fluorescence techniques during AMAZE-08

Seasonal Fluctuations of Microbial Aerosol in Live Poultry Markets and the Detection of Endotoxin

Contact Info

Product

Resources

About