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| 1 | Physicochemical and toxicological characteristics of nanoparticles in aerosols in southern Thailand during recent haze episodes in lower southeast Asia显示文摘Transboundary haze from biomass burning is one of the most important air pollutions in Southeast Asia.The most recent serious haze episode occurred in 2015.Southern Thailand was affected by the haze during September to October when the particulate matter concentration hit a record high.We investigated physical and chemical characteristics of aerosols,including concentration and aerosol size distribution down to sub-micron sizes during haze episodes in 2013 and 2015 and,for reference,an insignificant haze period in 2017.The highest total suspended particulates and PM 10 levels in Hat Yai city were 340.1 and 322.5μg/m^3.The mass fractions were nanoparticles(<100 nm)3.1%-14.8%and fine particles(<1μm)54.6%-59.1%.Polycyclic aromatic hydrocarbon size distributions in haze periods peaked at 0.75μm and the concentrations are 2-30 times higher than the normal period.High molecular weight(4-6 ring)PAHs during the haze episode contribute to about 56.7%-88.0%for nanoparticles.The average values of benzo(a)pyrene toxic equivalency quotient were 3.34±2.54ng/m^3 in the 2015 haze period but only 0.89±0.17 ng/m^3 in 2017.It is clear that particles smaller than 1μm,were highly toxic.Nanoparticles contributed 19.4%-26.0%of total BaP-TEQ,whereas the mass fraction is 13.1%-14.8%.Thus the nanoparticles were more carcinogenic and can cause greater health effect than larger particles.The fraction of BaP-TEQ for nanoparticles during 2017 non-haze period was nearly the same,while the mass fraction was lower.This indicates that nanoparticles are the significant source of carcinogenic aerosols both during haze and non-haze periods. | Jiraporn Chomanee Kunchira Thongboon Surajit Tekasakul Masami Furuuchi Racha Dejchanchaiwong Perapong Tekasakul | 2020 | Journal of Environmental Sciences2020，32，8： | 2 |
| 2 | Structural evolution of the Brazilian airport network显示文摘 | Racha L E C | 2009 | Journal of Statistical Mechanics: Theory and Experiment2009，，04： | 1 |
| 3 | Different roles of N-and C-termini in the functional activity of FGF21显示文摘 | Micanovic R Rachas DW Dunbar JD | 2009 | J Cell Physiol2009，219，2： | 1 |
| 4 | Improvement of thermal stability, rheological and mechanical properties of PLA, PBAT and their blends by re- active extrusion with functionalized epoxy 显示文摘 | RACHA A I LAMNAWAR K MAAZOUZ A | 2012 | Polym Degrad Stab2012，97，10： | 1 |
| 5 | Improve- ment of thermal stability, rheological and mechanical properties of PLA,PBAT and their blends by reactive extrusion with functional- ized epoxy显示文摘 | Racha Al-Itry Khalid Lamnawar Abderrahim Maazouz | 2012 | Polymer Degradation and Stability2012，97，10： | 1 |
| 6 | Privacy issues in mobilesocial networks 显示文摘 | Racha A Nabeel A Noha R | 2012 | Procedia Computer Science2012，，10： | 1 |
| 7 | Identification of enzymes responsible for the metabolism of Phenobarbital显示文摘 | Hargraves JA Howald WN Racha JK | 1996 | Int Soc Stud Xe- noblot Proc1996，10，： | 1 |
| 8 | Aldehyde Dehydrogenase Activation Prevents Reperfusion Arrhythmias by Inhibiting Local Renin Release From Cardiac Mast Cells显示文摘 | Kenichiro Koda Mariselis Salazar-Rodriguez Federico Corti Noel Yan-Ki Chan Racha Estephan Randi B. Silver Daria Mochly-Rosen Roberto Levi | 2010 | Circulation2010，，8： | 1 |
| 9 | Impact of transport of fine and ultrafine particles from open biomass burning on air quality during 2019 Bangkok haze episode显示文摘Transboundary and domestic aerosol transport during 2018–2019 affecting Bangkok air quality has been investigated.Physicochemical characteristics of size-segregated ambient particles down to nano-particles collected during 2017 non-haze and 2018–2019 haze periods were analyzed.The average PM2.5 concentrations at KU and KMUTNB sites in Bangkok,Thailand during the haze periods were about 4 times higher than in non-haze periods.The highest average organic carbon and elemental carbon concentrations were 4.6±2.1μg/m3 and 1.0±0.4μg/m3,respectively,in PM0.5–1.0 range at KU site.The values of OC/EC and charEC/soot-EC ratios in accumulation mode particles suggested the significant influence of biomass burning,while the nuclei and coarse mode particles were from mixed sources.PAH concentrations during 2018–2019 haze period at KU and KMUTNB were 3.4±0.9 ng/m3 and 1.8±0.2 ng/m3,respectively.The PAH diagnostic ratio of PM2.5 also suggested the main contributions were from biomass combustion.This is supported by the 48-hrs backward trajectory simulation.The higher PM2.5 concentrations during 2018–2019 haze period are also associated with the meteorological conditions that induce thermal inversions and weak winds in the morning and evening.Average values of benzo(a)pyrene toxic equivalency quotient during haze period were about 3–6 times higher than during non-haze period.This should raise a concern of potential human health risk in Bangkok and vicinity exposing to fine and ultrafine particulate matters in addition to regular exposure to traffic emission. | Racha Dejchanchaiwong Perapong Tekasakul Surajit Tekasakul Worradorn Phairuang Nobchonnee Nim Chaiyoth Sresawasd Kunchira Thongboon Thunyapat Thongyen Panwadee Suwattiga | 2020 | Journal of Environmental Sciences2020，32，11： | 1 |
| 10 | Automated high throughput human CYP isoform activity assay using SPE-LC/MS method:application in CYP inhibition evaluation显示文摘 | Yin H Racha J Li SY | 2000 | Xenobiotica2000，30，： | 1 |
| 11 | Highly selective hydrogenolysis of glycerol to 1, 3-propanediol over a boehmite-supported platinum/tungsten catalyst显示文摘 | RACHA A TOMOO M TAKATO M KOICHIRO J KIYOTOMY K | 2013 | ChemSusChem2013，6，8： | 1 |
| 12 | Improvement of Thermal Stability, Rheological and Me- chanical Properties of PLA, PBAT and Their Blends by Reactive Extrusion with functionalized Epoxy 显示文摘 | Racha Al-Itry Khalid Lamnawar Abderrahim Maazouz | 2012 | Polymer Degradation and Stability2012，97，10： | 1 |
| 13 | Privacy Issues in Mobile Social Networks显示文摘 | Racha A Nabeel A Noha R | 2012 | Procedia Computer Science2012，，10： | 1 |
| 14 | A facile one pot synthesis of bisphosphonic acids and their sodium salts from nitriles显示文摘 | DIWELA VN RAMESH D RACHA L | 2007 | Arkivoc2007，，： | 1 |
| 15 | Automated high throughput human CYP isoform activity assay using SPE-LC/MS method:application in CYP inhibition evaluation显示文摘 | Yin H Racha J Li SY | 2000 | Xenobiotica2000，30，2： | 1 |
| 16 | Identification of enzymes responsible for the metabolism of phenobarbital显示文摘 | Hargraves JA Howald WN Racha JK | 1996 | Int Soc Stud Xenobiot Proc1996，10，： | 1 |
| 17 | Activity of elaeochytrinA from Ferula elaeochytris on leukemia cell lines 显示文摘 | Alkhatib Racha Hennebelle Thierry Joha | 2008 | J Phytochemistry2008，69，17： | 1 |
| 18 | Auto- mated high throughput human CYP isoform activity assay using SPE-LClMS method: application in CYP inhibition evat- uation显示文摘 | Yin H Racha J Li SY Olejnik N Satoh H Moore D | 2000 | Xenobiotica2000，30，2： | 1 |
| 19 | Automated high throughput human CYP isoform activity assay using SPE-LC/MS method:application in CYP inhibition evaluation显示文摘 | Racha J Li S Y | 2000 | Xenobiotica2000，30，2： | 1 |
| 20 | Improvement of Thermal Stability,Rheological and Mechanical Properties of PLA,PBAT and their Blends by Reactive Extrusion with Functionalized Epoxy显示文摘 | Racha Al-Itry Khalid Lamnawar Abderrabim Maazouz | 2012 | Polymer Degradation and Stability2012，97，10： | 1 |
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