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| 1 | Cell concentration,viability and culture composition of airborne bacteria during a dust event in Beijing显示文摘Airborne bacteria were measured when a dust storm passed Beijing in spring 2012 with a focus on cell concentration,viability and TSA-and R2A-cultured strain composition.The concentration varied at an order of 10~7 cells/m^3 with dust loading(demonstrated with PM_(10))and they had a very close correlation(R_T^2 = 0.91,p < 0.01).At the time of highest PM_(10) of652 μg/m^3,the bacterial concentration reached 1.4 × 10~8 cells/m^3,which was larger than that before and after the dust event by one order.Bacterial viability,the ratio of number concentration of viable cells to total cells,was 32%-64%and smaller in the dust plume than that before the dust arrival.Bacterial strains from the culture ranged between 2.5 x 104 and4.6×10~5 CFU/m^3 and no correlation with PM_(10) was determined.Their composition was different before and after the dust arrival according to 16SrRNA gene sequences and strains belong to Actinomycetes and Firmicutes were the majority in the dust samples. | Hongli Yuan Daizhou Zhang Yanning Shi Baozhen Li Jinshui Yang Xuejian Yu Nan Chen Makiko Kakikawa | 2017 | Journal of Environmental Sciences2017，29，5： | 5 |
| 2 | Morphology and composition of particles emitted from a port fuel injection gasoline vehicle under real-world driving test cycles显示文摘Traffic vehicles, many of which are powered by port fuel injection(PFI) engines, are major sources of particulate matter in the urban atmosphere. We studied particles from the emission of a commercial PFI-engine vehicle when it was running under the states of cold start, hot start, hot stabilized running, idle and acceleration, using a transmission electron microscope and an energy-dispersive X-ray detector. Results showed that the particles were mainly composed of organic, soot, and Ca-rich particles, with a small amount of S-rich and metal-containing particles, and displayed a unimodal size distribution with the peak at 600 nm. The emissions were highest under the cold start running state, followed by the hot start, hot stabilized, acceleration, and idle running states. Organic particles under the hot start and hot stabilized running states were higher than those of other running states. Soot particles were highest under the cold start running state. Under the idle running state, the relative number fraction of Ca-rich particles was high although their absolute number was low. These results indicate that PFI-engine vehicles emit substantial primary particles,which favor the formation of secondary aerosols via providing reaction sites and reaction catalysts, as well as supplying soot, organic, mineral and metal particles in the size range of the accumulation mode. In addition, the contents of Ca, P, and Zn in organic particles may serve as fingerprints for source apportionment of particles from PFI-engine vehicles. | Jiaoping Xing Longyi Shao Wenbin Zhang Jianfei Peng Wenhua Wang Cong Hou Shijin Shuai Min Hu Daizhou Zhang | 2019 | Journal of Environmental Sciences2019，31，2： | 4 |
| 3 | Applicability of LIVE/DEAD BacLight stain with glutaraldehyde fixation for the measurement of bacterial abundance and viability in rainwater显示文摘Rainwater contains substantial bacteria and rain is an efficient pathway for the dissemination of bacteria from the atmosphere to land and water surfaces.However,quantitative information on rainwater bacteria is very limited due to the lack of a reliable method.In this study,the epifluorescence microscopy enumeration with the LIVE/DEAD BacLight Bacterial Viability Kit stain was verified to quantify the abundance of viable and non-viable bacterial cells in rainwater,with the 4',6-diamidino-2-phenylindole(DAPI) stain for the reference of total cell counts.Results showed that the total counts of bacterial cells by LIVE/DEAD BacLight staining were consistent with those by DAPI staining,and the average detection efficiency was(109 ± 29)%.The ratio of cell count with glutaraldehyde fixation to that without fixation was(106 ± 5)%on average.The bacterial concentration in negative control was usually an order of magnitude lower than that in rainwater samples.However,in case of small precipitation,the abundance in negative control could be more than that in rainwater samples.These results indicate that the enumeration with LIVE/DEAD BacLight bacterial viability assay coupled with glutaraldehyde fixation and careful negative control investigation is an approach applicable to the measurement of the concentration and viability of bacterial cells in rainwater. | Wei Hu Kotaro Murata Daizhou Zhang | 2017 | Journal of Environmental Sciences2017，29，1： | 4 |
| 4 | Size and elemental composition of dry-deposited particles during a severe dust storm at a coastal site of Eastern China显示文摘Dry-deposited particles were collected during the passage of an extremely strong dust storm in March, 2010 at a coastal site in Qingdao(36.15°N, 120.49°E), a city located in Eastern China. The size, morphology, and elemental composition of the particles were quantified with a scanning electron microscope equipped with an energy dispersive X-ray instrument(SEM–EDX). The particles appeared in various shapes, and their size mainly varied from 0.4to 10 μm, with the mean diameters of 0.5, 1.5, and 1.0 μm before, during, and after the dust storm, respectively. The critical size of the mineral particles settling on the surface in the current case was about 0.3–0.4 μm before the dust storm and about 0.5–0.7 μm during the dust storm. Particles that appeared in high concentration but were smaller than the critical size deposited onto the surface at a small number flux. The elements Al, Si and Mg were frequently detected in all samples, indicating the dominance of mineral particles. The frequency of Al in particles collected before the dust storm was significantly lower than for those collected during and after the dust storm. The frequencies of Cl and Fe did not show obvious changes, while those of S, K and Ca decreased after the dust arrival. These results indicate that the dust particles deposited onto the surface were less influenced by anthropogenic pollutants in terms of particle number. | Hongya Niu Daizhou Zhang Wei Hu Jinhui Shi Ruipeng Li Huiwang Gao Wei Pian Min Hu | 2016 | Journal of Environmental Sciences2016，28，2： | 4 |
| 5 | Nitrate and sulfate in indi- vidual Asian dust-storm particles in Beijing,China in spring of 1995 and 1996显示文摘 | ZHANG Daizhou IWASAKA Y | 1999 | Atmospheric Environment1999，33，19： | 1 |
| 6 | Mixture of sulfate and nitrate in coastal atmospheric aerosols:individual particle studies in Qingdao (36°04'N, 120°21'E) ,Chlna显示文摘 | Zhang Daizhou Sift Guangyu lwasaka Yasunobu | 2000 | Atmos Environ2000，34，： | 1 |
| 7 | Characteristics of dry deposited mineral particles associated with weather conditions in the adjacent sea areas of East China during a cruise in spring 2011显示文摘 | Hongya Niu Wei Hu Wei Pian Min Hu Daizhou Zhang | 2016 | Particuology2016，14，5： | 1 |
| 8 | Haze particles over a coal-burning region in the China Loess Plateau in winter: Three flight missions in December 2010显示文摘 | Li Weijun Shi Zongbo Zhang Daizhou Zhang Xiaoye Li Peiren Feng Qiujuan Yuan Qi Wang Wenxing | 2012 | EN2012，，12： | 1 |
| 9 | Size change of Asian dust particals caused by sea salt interaction:measurements in southwestern Japan显示文摘 | ZHANG Daizhou YASUNOBU I | 2004 | Geophysical Research Letters2004，31，3： | 1 |
| 10 | Charging states on atmospheric aerosol particles affected by meteorological conditions显示文摘Previous studies on haze formation focused mainly on the various chemical components in aerosol particles and their physicochemical effects on particle behaviour(e.g.,generation,growth,and agglomeration).This paper describes the measurement of the charging state on atmospheric aerosol particles,which could be affected by meteorological conditions.A series of experiments on particle charging state and meteorological factors was undertaken on the roof of the west 4th building on the Qujiang Campus at Xi'an Jiaotong University(China).Measurements were conducted approximately 20 m above ground level,Our results showed that most atmospheric particles carried net negative or positive charge and that the electric charge on the particles varied diurnally and seasonally.The average amount of charge on particles was higher in winter than in summer.The number concentration of charged particles was higher during the day than overnight.Obvious difference in the average charge of aerosol particles was found between sand-dust days and haze days.A strong relationship was found between the PM2.s concentration,charge amount on particles,and humidity.Our findings show that particle formation and growth could partly be attributed to variation in particle charging state,which is related to meteorological conditions including atmospheric humidity. | Yuanping He Zhaolin Gu Weizhen Lu Liyuan Zhang Daizhou Zhang Tomoaki Okuda Chuck Wah Yu | 2020 | Particuology2020，18，5： | 0 |
| 11 | Research Progress of Sunscreen Agents and Encapsulate Technology显示文摘The harm of ultraviolet radiation to human skin and the mechanism of traditional sunscreen agents and natural sunscreen agents were reviewed.Sunscreen agents were usually encapsulated with delivery systems due to the instability and skin permeability.The research progress of several common sunscreen delivery systems was introduced,the future research direction of sunscreen agents was also prospected. | Zheng Xiaoyang Meng Xiangjing Li Min Liu Bo Zhang Xiangkui Duan Chong gang Zhang Daizhou Ling Peixue Wang Dongliang | 2023 | China Detergent & Cosmetics2023，8，2： | 0 |
| 12 | First workshop on indoor air pollution and advanced air pollution control technologies Kumamoto, Japan, January 8-11, 2016显示文摘The First Workshop on Indoor Air Pollution and Control was held in Kumamoto,Japan,and its success was due in large measure to the efforts of the local host Prof.Daizhou Zhang from Prefectural University of Kumamoto and his students.The workshop was sponsored by the China Association of Aerosol Science | CAO Junji ZHANG Daizhou | 2016 | 地球环境学报2016，7，3： | 0 |
| 13 | Surrogate atmospheric dust particles generated from dune soils in laboratory: Comparison with field measurement显示文摘Desert dust strongly influences the climate and the environment by altering the radiation budget, participating in atmospheric chemical reactions, and engaging the biogeochemical cycle. Studying its impacts requires knowledge of the physical and chemical properties of the original particles from the source origin. Unfortunately, the field collection of atmospheric samples in the desert is impractical. Fine surface soil is thus considered an alternative material from which to obtain the information applicable to dust particles from the desert soil. In this study, a laboratory system was set up to generate dust particles with simulated natural wind erosion processes from surface soils or directly from desert surfaces. Surface soils and field dust were simultaneously collected during a local blowing dust event. The comparison between the laboratory-generated dust and the field dust showed a consistent trend in particle size distribution and chemical composition. The chemical compositions were found to have explainable differences with the Certified Reference Materials for Asian dust (CJ-2). The laboratory-generated dust particles with the system could be applied as surrogates for soil-emitted dust in desert areas. | Feng Wu Na Song Tafeng Hu Steven Sai Hang Ho Junji Cao Daizhou Zhang | 2023 | Particuology2023，，1： | 0 |
| 14 | Identification of coexistence of biological and non-biological aerosol particles with DAPI (4′,6-diamidino-2-phenylindole) stain显示文摘The fluorescent dye 4′,6-diamidino-2-phenylindole (DAPI) has been widely used to stain microorganisms in various environment media. We applied DAPI fluorescence enumeration to airborne microorganisms and found that non-biological particles, including organic compounds, minerals, and soot, were also visible upon exposure to UV excitation under fluorescence microscope. Using laboratory-prepared biological particles as the control, we investigated the feasibility of identifying both biological and non-biological particles in the same sample with DAPI staining. We prepared biological (bacterial, fungi, and plant detritus) and non-biological (biochar, soot, mineral, metal, fly ash, salt) particles in the laboratory and enumerated the particles and their mixture with DAPI. We found that mineral particles were transparent, and biochar, soot, metals and fly ash particles were black under a filter set at excitation 350/50 nm and emission 460/50 nm bandpass (DAPI-BP), while biological particles were blue, as expected. Particles of the water-soluble salts NaCl and (NH_(4))_(2)SO_(4) were yellow under a filter set at excitation 340–380 nm and emission 425 nm long pass (DAPI-LP). Case studies with samples of dustfall, atmospheric aerosols and surface soils could allow for the quantification of the relative number of different types of particles and particles with organic matter or salt coating as well. Fluorescence enumeration with DAPI stain is thus able to identify the co-existence of biological and non-biological particles in the air, at least to the extent of those examined in this study. | Ting Liu Jiaquan Zhang Junji Cao Han Zheng Changlin Zhan Hongxia Liu Lili Zhang Kai Xiao Shan Liu Dong Xiang Daizhou Zhang | 2023 | Particuology2023，，1： | 0 |
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