Long-time large-area haze weather appeared in Wuhan on June 11, 2012. It was monitored that PM2.5 hourly concentration obviously rose, and peak value reached 658 μg/m3. OC and PM2.5 presented high correlation, and co...Long-time large-area haze weather appeared in Wuhan on June 11, 2012. It was monitored that PM2.5 hourly concentration obviously rose, and peak value reached 658 μg/m3. OC and PM2.5 presented high correlation, and correlation coefficient was 0.96. OC daily average concentration occupied 10% -20% in PM2.5, and difference was big between haze and normal weather. EC occupied 5%, and difference was very small between haze and normal weather. By analyzing change trend of OC/EC, it was found that OC/EC presented increasing trend in late May and was even higher than that during 11 -15 June. It was clear that biomass combustion taking straw as the representation has started in late May. But two strong precipitation on May 29 and June 6 inhibited haze weather, and specific meteorological condition caused haze on June 11. Proportion of SOC to OC reached 14% -70%, illustrating that daily difference of secondary photochemical reaction was very big in Wuhan. OC/EC values were respectively 2.7, 3.5 and 4.2 in May, June and haze period. SOC daily means were respectively （5.33 ±4.77） and （32.5 ±23.4） μg/m^3 in May and haze period. Major pollution source of haze weather was biomass combustion, and haze occurrence had very big relationship with special meteorological condition.展开更多
Carbonaceous components contribute significant fraction of fine particulate matter (PM2.5). Study of organic carbon (OC) and elemental carbon (EC) in PM2.5 may lead to better understanding of secondary organic carbon ...Carbonaceous components contribute significant fraction of fine particulate matter (PM2.5). Study of organic carbon (OC) and elemental carbon (EC) in PM2.5 may lead to better understanding of secondary organic carbon (SOC) formation. This year-long (December 2008 to December 2009) field study was conducted in an animal agriculture intensive area in North Carolina of United States. Samples of PM2.5 were collected from five stations located in an egg production facility and its vicinities. Concentrations of OC/EC and thermograms were obtained using a thermal-optical carbon analyzer. Average levels of OC in the egg production house and at ambient stations were 42.7 μg/m3 and 3.26 - 3.47 μg/m3, respectively. Average levels of EC in the house and at ambient stations were 1.14 μg/m3 and 0.36 - 0.42 μg/m3, respectively. The OC to total carbon (TC) ratios at ambient stations exceeded 0.67, indicating a significant fraction of SOC presented in PM2.5. Principal factor analysis results suggested that possible major source of in-house PM2.5 was from poultry feed and possible major sources of ambient PM2.5 was from contributions of secondary inorganic and organic PM. Using the OC/EC primary ratio analysis method, ambient stations SOC fractions ranged from 68% to 87%. These findings suggested that SOC could appreciably contribute to total PM2.5 mass concentrations in this agriculture intensive area.展开更多
The incidence of gynaecological tumours,the main factor threatening women’s health and safety,is increasing with the daily heavier pressure of women’s life and work;Due to its serious threat to women,the disease has...The incidence of gynaecological tumours,the main factor threatening women’s health and safety,is increasing with the daily heavier pressure of women’s life and work;Due to its serious threat to women,the disease has grasped increasingly more vigilance and attention.The discovery and research of micro ribonucleic acid(microRNA),a general term for a class of small-molecule RNA,showed that there was a close relationship between microRNA and the occurrence and development of gynaecological tumours.In this paper,based on the recent researches on the relationship between microRNA and gynaecological tumours,a comprehensive analysis was made to do a favour for scientific research and clinical treatment of gynaecological tumours.展开更多
文摘Long-time large-area haze weather appeared in Wuhan on June 11, 2012. It was monitored that PM2.5 hourly concentration obviously rose, and peak value reached 658 μg/m3. OC and PM2.5 presented high correlation, and correlation coefficient was 0.96. OC daily average concentration occupied 10% -20% in PM2.5, and difference was big between haze and normal weather. EC occupied 5%, and difference was very small between haze and normal weather. By analyzing change trend of OC/EC, it was found that OC/EC presented increasing trend in late May and was even higher than that during 11 -15 June. It was clear that biomass combustion taking straw as the representation has started in late May. But two strong precipitation on May 29 and June 6 inhibited haze weather, and specific meteorological condition caused haze on June 11. Proportion of SOC to OC reached 14% -70%, illustrating that daily difference of secondary photochemical reaction was very big in Wuhan. OC/EC values were respectively 2.7, 3.5 and 4.2 in May, June and haze period. SOC daily means were respectively （5.33 ±4.77） and （32.5 ±23.4） μg/m^3 in May and haze period. Major pollution source of haze weather was biomass combustion, and haze occurrence had very big relationship with special meteorological condition.
文摘Carbonaceous components contribute significant fraction of fine particulate matter (PM2.5). Study of organic carbon (OC) and elemental carbon (EC) in PM2.5 may lead to better understanding of secondary organic carbon (SOC) formation. This year-long (December 2008 to December 2009) field study was conducted in an animal agriculture intensive area in North Carolina of United States. Samples of PM2.5 were collected from five stations located in an egg production facility and its vicinities. Concentrations of OC/EC and thermograms were obtained using a thermal-optical carbon analyzer. Average levels of OC in the egg production house and at ambient stations were 42.7 μg/m3 and 3.26 - 3.47 μg/m3, respectively. Average levels of EC in the house and at ambient stations were 1.14 μg/m3 and 0.36 - 0.42 μg/m3, respectively. The OC to total carbon (TC) ratios at ambient stations exceeded 0.67, indicating a significant fraction of SOC presented in PM2.5. Principal factor analysis results suggested that possible major source of in-house PM2.5 was from poultry feed and possible major sources of ambient PM2.5 was from contributions of secondary inorganic and organic PM. Using the OC/EC primary ratio analysis method, ambient stations SOC fractions ranged from 68% to 87%. These findings suggested that SOC could appreciably contribute to total PM2.5 mass concentrations in this agriculture intensive area.
基金Natural Science Foundation of Guangxi Province(No.2018GXNSFAA294115)Natural Science Foundation of Guangxi Province(No.2018GXNSFAA050064)+1 种基金Traditional Chinese Medicine-Guangxi firstclass discipline construction project(No.Gui Jiao Ke Yan[2018]12)Development Program of High-level Talent Team under Qihuang Project of Guangxi University of Chinese Medicine(No.2018005)。
文摘The incidence of gynaecological tumours,the main factor threatening women’s health and safety,is increasing with the daily heavier pressure of women’s life and work;Due to its serious threat to women,the disease has grasped increasingly more vigilance and attention.The discovery and research of micro ribonucleic acid(microRNA),a general term for a class of small-molecule RNA,showed that there was a close relationship between microRNA and the occurrence and development of gynaecological tumours.In this paper,based on the recent researches on the relationship between microRNA and gynaecological tumours,a comprehensive analysis was made to do a favour for scientific research and clinical treatment of gynaecological tumours.
