Harmonic ionospheric oscillation by the 2010 eruption of the Merapi volcano, Indonesia, and the relevance of its amplitude to the mass eruption rate
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
Authors: Cahyadi, Mokhamad Nur; Rahayu, Ririn Wuri; Heki, Kosuke; Nakashima, Yuki
Abstract
Using continuous data from ground-based Global Satellite Navigation System (GNSS) receivers in Java and Sumatra, Indonesia, we studied the response of ionospheric total ionospheric electron content (TEC) to the 2010 Nov.5 eruption of the Merapi volcano in central Java. We then compared the results with the case of the 2014 Feb.13 eruption of the Kelud volcano, eastern Java. The TEC showed a quasi-periodic oscillation of a frequency similar to 4 mHz with average amplitudes of 0.9 and 1.8% relative to background values lasting for similar to 20 and similar to 120 min for the Merapi and Kelud eruptions, respectively. By comparing the two cases, together with the 2015 April eruption of the Calbuco volcano. Chile, we found the relative TEC oscillation amplitude may scale with the mass eruption rate. This suggests that the product of such TEC oscillation amplitude and the duration provides a new measure for the total volume of the volcanic deposits. (C) 2020 Published by Elsevier B.V.
Lactobacillus rhamnosus LRa05 improves lipid accumulation in mice fed with a high fat diet via regulating the intestinal microbiota, reducing glucose content and promoting liver carbohydrate metabolism
FOOD & FUNCTION
Authors: Sun, Mengzhen; Wu, Tao; Zhang, Guohua; Liu, Rui; Sui, Wenjie; Zhang, Maomao; Geng, Jieting; Yin, Jinjin; Zhang, Min
Abstract
To elucidate the anti-obesity effect of Lactobacillus rhamnosus LRa05 through the analysis of gut microbiota and liver metabolomics, we investigated changes in gut microbiota and liver metabolomic phenotypes in mice by 16S ribosomal RNA gene sequencing and ultraperformance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry. C57BL/6J male mice were orally administered with LRa05 for 8 weeks. Body weight, serum lipid levels, and the lipid accumulation of liver cells and epididymal fat tissues in the mice fed with a high-fat diet were inhibited after treatment with LRa05 at 1 x 10(9) CFU per day per mouse. LRa05 also reshaped the gut microbiota, reduced the abundance of the pro-pathogen bacterial Streptococcus, suppressed blood and liver glucose content, and promoted liver carbohydrate and energy metabolism. Moreover, Intestinimonas and palmitoyl ethanolamide exhibited a positive correlation, whereas Enterorhabdus and vitamin B2 showed a negative correlation. Therefore, LRa05 can potentially be used as an anti-obesity probiotic in further interventions.