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Sayako Ueda,Kazuo Osada,Makiko Yamagami,Fumikazu Ikemori,Kunihiro Hisatsune 한국대기환경학회 2020 Asian Journal of Atmospheric Environment (AJAE) Vol.14 No.2
Expanding the use of a recently introduced low-cost particle monitor (DC1700 Dylos Air Quality Monitor) for sensing atmospheric PM2.5 requires comparison with data obtained using a certified method for PM2.5 based on appropriate atmospheric observations. Full-year measurements of atmospheric aerosols were taken in Nagoya, Japan during March 2017-March 2018 using the DC1700 to measure the particle number concentrations of >0.5 and >2.5 μm diameter particles and to measure the PM2.5 mass concentration (Mdry, PM2.5) using an automated β attenuation mass monitor (PM712). The number-size distribution was measured using an optical particle counter (KC01D). The dried mass concentration of 0.5-2.5 μm particles (Mdry, 0.5-2.5) was estimated from the ambient relative humidity and the DC1700 number concentration. The values of Mdry, 0.5-2.5 were invariably less than those of Mdry, PM2.5. The coefficient of determination and slope of Mdry, 0.5-2.5 to Mdry, PM2.5 for the year were, respectively, 0.68 and 0.40. Slope values changed seasonally from 0.24 in July and August 2017 to 0.55 in May and April 2017. Light absorbing particles, smaller-fine particles, and the estimation method of Mdry, 0.5-2.5 were inferred as causes of the difference between Mdry, 0.5-2.5 and Mdry, PM2.5. Especially, we estimated a large contribution (ca. 54% underestimation of Mdry, 0.5-2.5 into Mdry, PM2.5) of particles smaller than the minimum detection diameter of DC1700. The seasonal variation of Mdry, 0.5-2.5/Mdry, PM2.5 was related to the volume fraction of particles smaller than 0.5 μm. Good correlation of Mdry, 0.5-2.5 to Mdry, PM2.5 suggests that data obtained using DC1700 with a correction factor are useful as a rough proxy of atmospheric PM2.5 within a season. However, precise estimation of PM2.5 from the DC1700 number concentrations should include appropriate corrections of the size distribution, not only hygroscopicity.
Edible Red Seaweed Hypnea asiatica Ameliorates High-Fat Diet-Induced Metabolic Diseases in Mice
Shigeru Murakami,Chihiro Hirazawa,Toshiki Mizutani,Takuma Ohya,Rina Yoshikawa,Ning Ma,Takahiko Ikemori,Takashi Ito,Chiaki Matsuzaki 한국식품영양과학회 2023 Journal of medicinal food Vol.26 No.11
Metabolic diseases, including obesity, diabetes, and fatty liver disease, are dramatically increasing around theworld. Seaweed is low in calories and rich in many active ingredients that are necessary for maintaining good health, and isexpected to be effective for preventing metabolic diseases. The purpose of this study was to examine the effects of a traditionalJapanese edible seaweed Hypnea asiatica (H. asiatica) on obesity, using a mouse model. H. asiatica was dried andpowdered, mixed with a high-fat diet, and fed to male C57BL/6J mice for 13 weeks. On the last day of the experiment, bloodsamples were collected under anesthesia and biochemical parameters such as lipids and adipokines were measured. Liver andadipose tissue were excised, weighed, and oxidant/antioxidant parameters were measured. Some mice were perfused with afixative solution containing formalin, and tissue specimens were prepared. A glucose tolerance test was used to assess insulinresistance. The inhibition of lipase activity was evaluated in vitro. Thirteen-week supplementation with H. asiatica suppressedbody weight gain, body fat accumulation, and blood glucose levels. H. asiatica also improved fatty liver and hypercholesterolemia,and reduced the oxidant and inflammatory parameters of serum and liver. H. asiatica increased fecal triglycerideexcretion and polyphenol-rich ethanol extract of H. asiatica inhibited lipase activity in vitro. These results suggest thatpolysaccharides and polyphenols in H. asiatica may ameliorate obesity and diabetes by inhibiting intestinal fat absorption andreducing oxidative stress and inflammation. H. asiatica may be useful in preventing metabolic diseases such as obesity,diabetes, and fatty liver.