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Hermann Marius Feumo Feusso,Hermann Marius Feumo Feusso,Hermine Laure Maza Djomkam,Carine Mvot Akak,Mehreen Lateef,Ayaz Ahmed,Anatole Guy Blaise Azebaze,Alain François Kamdem Waffo,Muhammad Shaiq Ali 한국생약학회 2020 Natural Product Sciences Vol.26 No.4
The chemical investigation of the methanolic crude extract of leaves of Diospyros iturensis gave us 15 known secondary metabolites identified as mixture of α-amyrenone (1) and β-amyrenone (2), b-amyrin (3), mixture of β-sitosterol (4) and stigmasterol (5), betulin (6), uvaol (7), betulinic acid (8), ursolic acid (9), corosolic acid (10), actinidic acid (11),11-O-p-hydroxybenzoylbergenin (12), bergenin (13) and mixture of stigmasterol glucoside (14) and β-sitosterol glucoside (15) respectively. The structures of secondary metabolites were elucidated with the help of NMR and mass spectral data and by comparison of their spectral data with literature. Among the fifteen isolated compounds, four compounds were identified for the first time in Diospyros genus. These included uvaol (7), corosolic acid (10), actinidic acid (11) and 11-O-p-hydroxybenzoylbergenin (12). Crude methanolic extract of leaves and four isolated compounds including betulin (6), betulinic acid (8), 11-O-p-hydroxybenzoylbergenin (12) and bergenin (13) were evaluated for their antiproliferative activity against two cancer cell lines CAL-27 and NCI-H460 by the MTT assay, antioxidant potential and inhibitory activity against the lipoxygenase and urease enzymes, respectively. The results indicated that the methanolic crude extract of leaves exhibited moderate antioxidant activity and was inactive against the two cancer cell lines. Betulin (6), 11-O-p-hydroxybenzoylbergenin (12) and bergenin (13) exhibited moderate antioxidant and lipoxygenase inhibition with IC50 = 65.8, 85.6, 82.5 µM and IC50 = 58.5, 95.2, 76.2 µM, respectively. Furthermore, 11-O-p-hydroxyben- zoylbergenin (12) and bergenin (13) exhibited moderate urease inhibition activity with IC50 values of 45.6 µM and 49.8 µM, respectively.
Meter and Rhythm in Sang-geun Lee`s Songs
( Hermann Gottschewski ) 이상근기념사업회 2016 이상근 연구 Vol.2 No.-
After some thoughts about the development of the Korean art song in the context of art songs of other countries, the usage of irregular meters in Sang-geun Lee`s songs is investigated in relation to Japanese art songs composed from the 1920s until around World War II. It is observed that the addition of a beat to a bar in the sense of a measured fermata or measured retardation, as well as the frequent use of off-beat phrase beginnings in the voice part, are common features in songs of both countries. Even the use of regularly alternating meters like 2/4+3/4 is found in some early Japanese art songs. These compositional techniques are not common in Western art songs and can thus be used to describe the peculiarities of an "Asian branch" of the worldwide art song production. It is argued that the use of irregular meters is mainly due to the struggle for an integration of Asian poetic meters into the framework of Western music, and it developed since the Japanese children`s song movement around 1920.
Does Tax Revenue Improve Economic Complexity in Africa?
Hermann Ndoya,Pousseni Bakouan 세종대학교 경제통합연구소 2023 Journal of Economic Integration Vol.38 No.2
This study assesses the effect of tax revenue on economic complexity in Africa using a sample of 29 African countries from 1995 to 2018. Applying the system generalized method of moments (GMM), we found that tax revenue spurs economic complexity in Africa by providing countries with critical financial resources to produce complex and sophisticated goods. We performed several robustness tests, including controlling for macroeconomic volatility and employing various measures of economic complexity and tax revenue, and the results remain robust. Furthermore, the mediation analysis results show that the effect of tax revenue on economic complexity is mediated by financial development and government spending. This study advocates for government strategies to enact tax reforms and maximize tax revenue mobilization, which will help finance economic complexity.