http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Ngo, Men Thi,Han, Jae Woo,Yoon, Sunggeon,Bae, Sohyun,Kim, Soo-Young,Kim, Hun,Choi, Gyung Ja American Chemical Society 2019 Journal of agricultural and food chemistry Vol.67 No.27
<P>While searching for new antifungal compounds, we revealed that a methanol extract of plant species <I>Maesa japonica</I> has a potent antifungal activity <I>in vivo</I> against rice blast fungus <I>Magnaporthe oryzae</I>. To identify the antifungal substances, the methanol extract of <I>M. japonica</I> was extracted by organic solvents, and consequently, six active compounds were isolated from the <I>n</I>-butanol layer. The isolated compounds were five new acylated triterpenoid saponins including maejaposide I (<B>1</B>), maejaposides C-1, C-2, and C-3 (<B>2</B>-<B>4</B>), and maejaposide A-1 (<B>5</B>), along with a known one, maejaposide A (<B>6</B>). These chemical structures were determined by NMR and a comparison of their NMR and MS data with those reported in the literature. Based on the <I>in vitro</I> antifungal bioassay, the five compounds (<B>2</B>-<B>6</B>) exhibited strong antifungal activity against <I>M. oryzae</I> with MIC values ranging from 4 to 32 μg/mL, except for maejaposide I (<B>1</B>) (MIC > 250 μg/mL). When the compounds were evaluated at concentrations of 125, 250, and 500 μg/mL for an <I>in vivo</I> antifungal activity against rice blast, compounds <B>2</B>-<B>6</B> strongly reduced the development of blast by at least 85% to 98% compared to the untreated control. However, compound <B>1</B> did not show any <I>in vivo</I> antifungal activity up to a concentration of 500 μg/mL. Taken together, our results suggest that the methanol extract of <I>M. japonica</I> and the new acylated triterpenoid saponins can be used as a source for the development of natural fungicides.</P> [FIG OMISSION]</BR>
Tax Revenue in ASEAN: Impact Factors and Policy Recommendations
Men Thi BUI,Hang Thi Ngo,Giang Thi Cam NGUYEN,Ha Ngan Duong 사람과세계경영학회 2024 Global Business and Finance Review Vol.29 No.6
Purpose: The paper aims to identify the factors that impact the budget revenues of countries in ASEAN economies. Design/methodology/approach: The paper applies fixed effect and random effect models on a 25-year database of ASEAN economies from 1991 to 2020. Findings: The research reveals that various factors such as trade openness, industry structure, inflation, and tax payment time have a significant impact on tax collection. However, no linkages between tax revenue and foreign direct investment demand and education levels. Factors including industrial proportion (IND), inflation rate (INF), trade openness (IMP), time to pay tax (TIME), and Agricultural added value (AGR) together significantly and statistically affect the tax revenue (TAX). Of these, variables that have a positive relationship with TAX include AGR, IND and TIME while INF is negatively related to tax. Research limitations/implications: The data from 2021 onwards has not been analyzed due to a lack of necessary data, which could show the impact of the COVID-19 pandemic on production and business and its effect on tax revenue. Originality/value: After a comprehensive and thorough variable selection and research design tailored for ASEAN economies, other than estimates on IND, IMP, and INF which are significantly consistent with most of the precedent literature, our research has reached some interesting findings recorded in our new variable (TIME), AGR, and FDI.
Ngo Thi Men,Jae Woo Han,Ji Hye Choi,Yong Ho Choi,Myoung Soo Park,Hun Kim,Gyung Ja Choi 한국농약과학회 2021 한국농약과학회 학술발표대회 논문집 Vol.2021 No.11
The plant pathogenic bacterium, Erwinia amylovora, causes the devastating disease known as fire blight in Rosaceous plants like apple, pear, quince, raspberry and several ornamentals. The culture filtrate of Aspergillus sp. KRICT-MF24 isolated from marine environment has potential to inhibit the growth of E. amylovora. To isolate and identify the antibacterial compound, the culture filtrates were successively partitioned with ethyl acetate and n-butanol. Through in vitro activity-guided fractionation of ethyl acetate layer, we isolated a pure antibacterial compound. The chemical structure was identified as asperlin by MS and NMR spectral analyses. The inhibitory effect of asperlin on the growth of E. amylovora and other plant pathogenic bacteria was investigated using broth microdilution and agar dilution methods. Asperlin showed the inhibitory activity against E. amylovora and Clavibacter michiganensis subsp. michiganensis with minimum inhibitory concentrations of 250 and 125 μg/ml, respectively. Our results suggested the Aspergillus sp. KRICT-MF24 and asperlin could be useful for the development of new antibacterial agents to control E. amylovora.
Biological Control Potential of Penicillium brasilianum against Fire Blight Disease
Kim Yeong Seok,Men Thi Ngo,Kim Bomin,Han Jae Woo,송재경,Park Myung Soo,최경자,Kim Hun 한국식물병리학회 2022 Plant Pathology Journal Vol.38 No.5
Erwinia amylovora is a causative pathogen of fire blight disease, affecting apple, pear, and other rosaceous plants. Currently, management of fire blight relies on cultural and chemical practices, whereas it has been known that few biological resources exhibit disease control efficacy against the fire blight. In the current study, we found that an SFC20201208-M01 fungal isolate exhibits antibacterial activity against E. amylovora TS3128, and the isolate was identified as a Penicillium brasilianum based on the β-tubulin (BenA) gene sequence. To identify active compounds from the P. brasilianum culture, the culture filtrate was partitioned with ethyl acetate and n-butanol sequentially. From the ethyl acetate layer, we identified two new compounds (compounds 3-4) and two known compounds (compounds 1-2) based on spectroscopic analyses and comparison with literature data. Of these active compounds, penicillic acid (1) exhibited promising antibacterial activity against E. amylovora TS3128 with a minimal inhibitory concentration value of 25 μg/ml. When culture filtrate and penicillic acid (125 μg/ml) were applied onto Chinese pearleaf crab apple seedlings prior to inoculation of E. amylovora TS3128, the development of fire blight disease was effectively suppressed in the treated plants. Our results provide new insight into the biocontrol potential of P. brasilianum SFC20201208-M01 with an active ingredient to control fire blight.