3篇
您的检索式：作者名="Caiqing Yan"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Sources and characteristics of fine particles over the Yellow Sea and Bohai Sea using online single particle aerosol mass spectrometer显示文摘Marine aerosols over the East China Seas are heavily polluted by continental sources. During the Chinese Comprehensive Ocean Experiment in November 2012, size and mass spectra of individual atmospheric particles in the size range from 0.2 to 2.0 μm were measured on board by a single particle aerosol mass spectrometer(SPAMS). The average hourly particle number(PN)was around 4560 ± 3240 in the South Yellow Sea(SYS), 2900 ± 3970 in the North Yellow Sea(NYS), and 1700 ± 2220 in the Bohai Sea(BS). PN in NYS and BS varied greatly over 3 orders of magnitude, while that in SYS varied slightly. The size distributions were fitted with two log-normal modes. Accumulation mode dominated in NYS and BS, especially during episodic periods. Coarse mode particles played an important role in SYS. Particles were classified using an adaptive resonance theory based neural network algorithm(ART-2a). Six particle types were identified with secondary-containing, aged sea-salt, soot-like, biomass burning, fresh sea-salt,and lead-containing particles accounting for 32%, 21%, 18%, 16%, 4%, and 3% of total PN,respectively. Aerosols in BS were relatively enriched in particles from anthropogenic sources compared to SYS, probably due to emissions from more developed upwind regions and indicating stronger influence of continental outflow on marine environment. Variation of source types depended mainly on origins of transported air masses. This study examined rapid changes in PN, size distribution and source types of fine particles in marine atmospheres. It also demonstrated the effectiveness of high-time-resolution source apportionment by ART-2a. | Huaiyu Fu Mei Zheng Caiqing Yan Xiaoying Li Huiwang Gao Xiaohong Yao Zhigang Guo Yuanhang Zhang | 2015 | Journal of Environmental Sciences2015，27，3： | 12 |
| 2 | Understanding PM_(2.5) sources in China:challenges and perspectives显示文摘INTRODUCTION China is experiencing severe air pollution,with extremely high levels of fine particulate matter(PM_(2.5)),especially common during the fall and winter seasons in northern China over recent years.Large-scale and long-lasting regional haze episodes occurred | Mei Zheng Caiqing Yan Shuxiao Wang Kebin He Yuanhang Zhang | 2017 | National Science Review2017，4，6： | 3 |
| 3 | Effects of Oxymatrine on the NF-kappa B expression of HaCaT cells显示文摘Objective: To study the effect of oxymatrine on the expression of nuclear factor-kappa B(NF-κB) of Human benign epidermal keratinocytes line(HaCaT cells). Methods:HaCaT cells were cultured with different concentration of Oxymatrine(10μg/ml, 50μg/ ml and 100 μg/ml) for 24 h, then 10- mol/L Substance P was added to the cells. After 30 min, NF-κB expression in the cells was 5 observed by immunocytochemistry, NF-κB P65 protein expression was evaluated by Western blot, and the mRNA expression of NF-κB P65 was evaluated by reverse transcription polymerase chain reaction(RT-PCR). The 10- mol/L Substance P and culture medium were 5 added to the Substance P group and control group, respectively. Results:In control group, expression rate of positive cells, the expressions of protein and mRNA of NF-κB were all low. In Substance P group, when 10- mol/L Substance P was added, the expres-sions were all 5 increased(P < 0.05). But in Oxymatrine groups, the expression rate of positive cells, the expressions of protein and mRNA were all descended in a concentration-dependent manner(P < 0.05 or P < 0.01). Conclusion:Oxymatrine can down-regulate the expression of NF-κB of the HaCaT cells and may play an important role in regulating anti-inflammation and immunity. | Caiqing Zhang Jie Feng Xiaoning Yan Wenbing Li Gang Hu | 2008 | Journal of Nanjing Medical University2008，22，3： | 2 |
您所在的机构暂未开通此部分的功能，请联系管理员