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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.
The Third Version of the Copenhagen Psychosocial Questionnaire
Hermann Burr,Hanne Berthelsen,Salvador Moncada,Matthias Nübling,Emilie Dupret,Yucel Demiral,John Oudyk,Tage S. Kristensen,Clara Llorens,Albert Navarro,Hans-Joachim Lincke,Christine Bocéréan,Ceyda Saha 한국산업안전보건공단 산업안전보건연구원 2019 Safety and health at work Vol.10 No.4
Introduction: A new third version of the Copenhagen Psychosocial Questionnaire (COPSOQ III) has been developed in response to trends in working life, theoretical concepts, and international experience. A key component of the COPSOQ III is a defined set of mandatory core items to be included in national short, middle, and long versions of the questionnaire. The aim of the present article is to present and test the reliability of the new international middle version of the COPSOQ III. Methods: The questionnaire was tested among 23,361 employees during 2016e2017 in Canada, Spain, France, Germany, Sweden, and Turkey. A total of 26 dimensions (measured through scales or single items) of the middle version and two from the long version were tested. Psychometric properties of the dimensions were assessed regarding reliability (Cronbach a), ceiling and floor effects (fractions with extreme answers), and distinctiveness (correlations with other dimensions). Results: Most international middle dimensions had satisfactory reliability in most countries, though some ceiling and floor effects were present. Dimensions with missing values were rare. Most dimensions had low to medium intercorrelations. Conclusions: The COPSOQ III offers reliable and distinct measures of a wide range of psychosocial dimensions of modern working life in different countries; although a few measures could be improved. Future testing should focus on validation of the COPSOQ items and dimensions using both qualitative and quantitative approaches. Such investigations would enhance the basis for recommendations using the COPSOQ III.
DO SECTOR RETURNS LEAD THE STOCK MARKET? TIIE INTERNATIONAL EVIDENCE
Hermann Sintim,Serapio Byekwaso 사람과세계경영학회 2006 Global Business and Finance Review Vol.11 No.2
This paper investigates the lead/lag relationship between the returns ofa countrys stock market index and 10 primary sector index returns. The sample consists of the Group of Seven (G-7) industrialized countries from January 1974 through December 2003. . This study documents a statistically significant lead/lag relationship between sector returns and the stock market index returns in all seven countries. No sector is consistently significant across countries. The results ofthis study support the gradual information diffusion hypothesis: information travels slowly between asset classes.
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.
Hermann, Andreas,Kim, Jeong Beom,Srimasorn, Sumitra,Zaehres, Holm,Reinhardt, Peter,Schö,ler, Hans R.,Storch, Alexander Hindawi Publishing Corporation 2016 Stem cells international Vol.2016 No.-
<P>Reprogramming of somatic cells into induced pluripotent stem cells (iPSCs) by overexpression of the transcription factors OCT4, SOX2, KLF4, and c-Myc holds great promise for the development of personalized cell replacement therapies. In an attempt to minimize the risk of chromosomal disruption and to simplify reprogramming, several studies demonstrated that a reduced set of reprogramming factors is sufficient to generate iPSC. We recently showed that a reduction of reprogramming factors in murine cells not only reduces reprogramming efficiency but also may worsen subsequent differentiation. To prove whether this is also true for human cells, we compared the efficiency of neuronal differentiation of iPSC generated from fetal human neural stem cells with either one (OCT4; hiPSC<SUB>1F-NSC</SUB>) or two (OCT4, KLF4; hiPSC<SUB>2F-NSC</SUB>) reprogramming factors with iPSC produced from human fibroblasts using three (hiPSC<SUB>3F-FIB</SUB>) or four reprogramming factors (hiPSC<SUB>4F-FIB</SUB>). After four weeks of coculture with PA6 stromal cells, neuronal differentiation of hiPSC<SUB>1F-NSC</SUB> and hiPSC<SUB>2F-NSC</SUB> was as efficient as iPSC<SUB>3F-FIB</SUB> or iPSC<SUB>4F-FIB</SUB>. We conclude that a reduction of reprogramming factors in human cells does reduce reprogramming efficiency but does not alter subsequent differentiation into neural lineages. This is of importance for the development of future application of iPSC in cell replacement therapies.</P>