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Antifungal Activity of Endophytic Bacteria Associated with Sweet Sorghum (Sorghum bicolor) 甜高粱内生细菌的抗真菌活性研究
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2021-05-20 DOI: 10.5614/J.MATH.FUND.SCI.2021.53.1.2
S. Meliah, T. Sulistiyani, P. Lisdiyanti, A. Kanti, I. Sudiana, Masaru Kobayashi
{"title":"Antifungal Activity of Endophytic Bacteria Associated with Sweet Sorghum (Sorghum bicolor)","authors":"S. Meliah, T. Sulistiyani, P. Lisdiyanti, A. Kanti, I. Sudiana, Masaru Kobayashi","doi":"10.5614/J.MATH.FUND.SCI.2021.53.1.2","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2021.53.1.2","url":null,"abstract":"The contribution of endophytic bacteria to the wellbeing of plants as biocontrol agents may be due to endophytic bacteria growing in the same niche as phytopathogens. This work was conducted to study the antagonistic activity of endophytic bacteria recovered from sweet sorghum against Sclerotium rolfsii, Fusarium solani, Fusarium oxysporum, Colletotrichum gloeosporioides in vitro and evaluate the mechanisms of these fungal inhibitions. We selected 78 endophytic bacteria from the stem and root of sweet sorghum plants. They were tested for antagonist activity by direct confrontation method. Antifungal compound production and lytic enzyme activity were examined to determine their mechanisms in inhibiting fungal pathogens. Antifungal compound production was checked by detecting the presence of NRPS and PKS genes. Lytic enzyme activity of the bacteria was evaluated by their ability to produce cellulase, chitinase, and protease. Selected bacteria were identified using molecular analysis based on the 16S rRNA gene. 14 out of the 78 tested isolates showed antagonistic activity and two were able to inhibit all four tested fungal strains. Four bacteria, designated as ACIL1, ACNM4, ACNM6, and ATNM4, produced natural products via NRPS pathway, but only one bacterial extract, designated as ACNM4, showed fungal inhibition. Ten isolates were able to produce hydrolytic enzymes. Endophytic bacteria identified as Burkholderia were revealed to have potential as a biocontrol agent.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86294046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
A New Family of Exponential Type Estimators in the Presence of Non-Response 无响应存在下一类新的指数型估计量
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2021-05-07 DOI: 10.5614/J.MATH.FUND.SCI.2021.53.1.1
Ceren Ünal, C. Kadilar
{"title":"A New Family of Exponential Type Estimators in the Presence of Non-Response","authors":"Ceren Ünal, C. Kadilar","doi":"10.5614/J.MATH.FUND.SCI.2021.53.1.1","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2021.53.1.1","url":null,"abstract":"We propose families of estimators for the population mean using an exponential function in case of non-response. This situation is examined under two cases, Case I and II. The bias, MSE and minimum MSE are separately obtained for both cases. We compare the proposed estimators theoretically with the main estimators from the literature, such as Hansen and Hurwitz (1946), ratio, regression and exponential estimators. The conditions for which the proposed estimators are most efficient are obtained. Moreover, different empirical studies are conducted to support the theoretical results for both cases.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82202675","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Analysis of SIS-SI Stochastic Model with CTMC on the Spread of Malaria Disease 带有CTMC的SIS-SI随机模型对疟疾传播的分析
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2021-01-01 DOI: 10.5614/j.math.fund.sci.2021.53.2.1
Niswah Yanfa Nabilah Syams, H. Sumarno, P. Sianturi
{"title":"Analysis of SIS-SI Stochastic Model with CTMC on the Spread of Malaria Disease","authors":"Niswah Yanfa Nabilah Syams, H. Sumarno, P. Sianturi","doi":"10.5614/j.math.fund.sci.2021.53.2.1","DOIUrl":"https://doi.org/10.5614/j.math.fund.sci.2021.53.2.1","url":null,"abstract":"Various mathematical models have been developed to describe the transmission of malaria disease. The purpose of this study was to modify an existing mathematical model of malaria disease by using a CTMC stochastic model. The investigation focused on the transition probability, the basic reproduction number (R0), the outbreak probability, the expected time required to reach a disease-free equilibrium, and the quasi-stationary probability distribution. The population system will experience disease outbreak if R0>1, whereas an outbreak will not occur in the population system if R0≤1. The probability that a mosquito bites an infectious human is denoted as k, while θ is associated with human immunity. Based on the numerical analysis conducted, k and θ have high a contribution to the distribution of malaria disease. This conclusion is based on their impact on the outbreak probability and the expected time required to reach a disease-free equilibrium.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79164707","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
On Subspace-ergodic Operators 关于子空间遍历算子
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.5
M. Moosapoor
{"title":"On Subspace-ergodic Operators","authors":"M. Moosapoor","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.5","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.5","url":null,"abstract":"In this paper, we define subspace-ergodic operators and give examples of these operators. We show that by any given separable infinite-dimensional Banach space, subspace-ergodic operators can be constructed. We demonstrate that an invertible operator T is subspace-ergodic if and only if T-1 is subspace-ergodic. We prove that the direct sum of two subspace-ergodic operators is subspace-ergodic and if the direct sum of two operators is subspace-ergodic, then each of them is subspace-ergodic. Also, we investigate relations between subspace-ergodic and subspace-mixing operators. For example, we show that if T is subspace-mixing and invertible, then Tn and T-n are subspace-ergodic for n∈ℕ.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73080652","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Predictor-Corrector Scheme for Conservation Equations with Discontinuous Coefficients 不连续系数守恒方程的一种预测-校正格式
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.6
Nasrin Okhovati, M. Izadi
{"title":"A Predictor-Corrector Scheme for Conservation Equations with Discontinuous Coefficients","authors":"Nasrin Okhovati, M. Izadi","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.6","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.6","url":null,"abstract":"In this paper we propose an explicit predictor-corrector finite difference scheme to numerically solve one-dimensional conservation laws with discontinuous flux function appearing in various physical model problems, such as traffic flow and two-phase flow in porous media. The proposed method is based on the second-order MacCormack finite difference scheme and the solution is obtained by correcting first-order schemes. It is shown that the order of convergence is quadratic in the grid spacing for uniform grids when applied to problems with discontinuity. To illustrate some properties of the proposed scheme, numerical results applied to linear as well as non-linear problems are presented.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88247293","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Statistical Forecast of Daily Maximum Air Temperature in Arid Areas at Summertime 干旱地区夏季日最高气温的统计预报
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.8
M. Al-Jiboori, Mahmoud Jawad Abu Al-Shaeer, Ahemd S. Hassan
{"title":"Statistical Forecast of Daily Maximum Air Temperature in Arid Areas at Summertime","authors":"M. Al-Jiboori, Mahmoud Jawad Abu Al-Shaeer, Ahemd S. Hassan","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.8","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.8","url":null,"abstract":"Based on historical observations of summers for the period from 2004 to 2018 with a focus on daily maximum and minimum air temperatures and wind speed recorded at 0600 GMT, a non-linear regression hypothesis is developed for forecasting daily maximum air temperature (Tmax) in arid areas such as Baghdad International airport station, which has a hot climate with no cloud cover or rain. Observations with dust storm events were excluded, thus this hypothesis could be used to predict daily Tmax on any day during summers characterized by fair weather. Using mean annual daily temperature range, daily minimum temperature, and the trend of maximum temperature with wind speed, Tmax was forecasted and then compared to those recorded by meteorological instruments. To improve the accuracy of the hypothesis, daily forecast errors, bias, and mean absolute error were analyzed to detect their characteristics through calculating relative frequencies of occurrence. At the end of this analysis, a value of (-0.45ºC) was added to the hypothesis as a bias term.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73745649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Optimal Parameters for Nonlinear Hirota-Satsuma Coupled KdV System by Using Hybrid Firefly Algorithm with Modified Adomian Decomposition 基于改进Adomian分解的混合萤火虫算法优化非线性Hirota-Satsuma耦合KdV系统参数
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.7
O. Qasim, K. Abed, A. F. Qasim
{"title":"Optimal Parameters for Nonlinear Hirota-Satsuma Coupled KdV System by Using Hybrid Firefly Algorithm with Modified Adomian Decomposition","authors":"O. Qasim, K. Abed, A. F. Qasim","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.7","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.7","url":null,"abstract":"In this paper, several parameters of the non-linear Hirota-Satsuma coupled KdV system were estimated using a hybrid between the Firefly Algorithm (FFA) and the Modified Adomian decomposition method (MADM). It turns out that optimal parameters can significantly improve the solutions when using a suitably selected fitness function for this problem. The results obtained show that the approximate solutions are highly compatible with the exact solutions and that the hybrid method FFA_MADM gives higher efficiency and accuracy compared to the classic MADM method.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74210688","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
Improved Variational Iteration Solutions to the SIR Model of Dengue Fever Disease for the Case of South Sulawesi 南苏拉威西岛登革热SIR模型的改进变分迭代解
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.4
S. Mungkasi
{"title":"Improved Variational Iteration Solutions to the SIR Model of Dengue Fever Disease for the Case of South Sulawesi","authors":"S. Mungkasi","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.4","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.4","url":null,"abstract":"The susceptible-infected-recovered (SIR) model of the spread of dengue fever for the case of South Sulawesi is considered. Rangkuti’s variational iteration method (RVIM) is recalled. This paper makes four contributions. The first one is to provide a successive approximation method (SAM) for solving the considered model. The second one is to show that SAM and RVIM are identical. Thirdly, a modification of RVIM is proposed. Fourthly, it is shown that the modification leads to an improvement of the accuracy of the method. Both RVIM and the improved version are quite accurate for short time periods. However, the improved version is more accurate and is able to provide more realistic explicit solutions to the model.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72935511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
Comparative Study of the Dynamics of Cosmic Rays for the Pakistan and China Atmospheric Regions 巴基斯坦和中国大气区域宇宙射线动力学的比较研究
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.1
F. Nawaz, B. Jan, F. Afridi, M. A. K. Yousufzai, F. Mehmood
{"title":"Comparative Study of the Dynamics of Cosmic Rays for the Pakistan and China Atmospheric Regions","authors":"F. Nawaz, B. Jan, F. Afridi, M. A. K. Yousufzai, F. Mehmood","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.1","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.1","url":null,"abstract":"This paper presents an analysis of cosmic ray intensity in Pakistan air space using spatial interpolation, comparing it with Chinese cosmic ray records from 1984 to 1993. The Exploratory Data Analytic (EDA) approach was applied to compare the cosmic ray fluctuations in both countries. The time series plot of the monthly cosmic rays showed relatively flatter counts in Pakistan than in China. The cosmic ray data for the years 1984 to 1993 fell within Solar Cycle 22, which lasted from 1986 to 1996, with its maximum phase in 1989 to 1991. The cosmic radiation varies between the atmospheric regions of Pakistan and China due to modulations in intensity that are accessible accordingly. It can be explained by purely astrophysical phenomena: (1) the source of emission of cosmic radiation may be different, (2) the rate at which emanation takes place depends on bursts of deep space dynamical objects from their sources that may be affected by solar wind and other solar radiations. Therefore, modulations in intensity are not only due to different geophysical locations. This study will help government organizations to predict and forecast cosmic rays values.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82074086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Serum Level of IL-6, Reactive Oxygen Species and Cortisol in Patients with Recurrent Aphthous Stomatitis related Imbalance Nutrition Intake and Atopy 复发性口疮性口炎患者血清IL-6、活性氧和皮质醇水平与营养摄入不平衡及特应性相关
IF 0.7
Journal of Mathematical and Fundamental Sciences Pub Date : 2020-12-31 DOI: 10.5614/J.MATH.FUND.SCI.2020.52.3.3
Nanan Nur’aeny, D. A. Gurnida, O. Suwarsa, I. Sufiawati
{"title":"Serum Level of IL-6, Reactive Oxygen Species and Cortisol in Patients with Recurrent Aphthous Stomatitis related Imbalance Nutrition Intake and Atopy","authors":"Nanan Nur’aeny, D. A. Gurnida, O. Suwarsa, I. Sufiawati","doi":"10.5614/J.MATH.FUND.SCI.2020.52.3.3","DOIUrl":"https://doi.org/10.5614/J.MATH.FUND.SCI.2020.52.3.3","url":null,"abstract":"One of the most common oral ulcerations is recurrent aphthous stomatitis (RAS), affecting approximately 20% of the general population worldwide. The etiology of RAS is still unclear but it is considered to be multifactorial, including imbalanced nutrition intake and allergic conditions such as atopy. The purpose of this study was to investigate the differences and correlation between the serum level of IL-6, reactive oxygen species (ROS), and cortisol in RAS patients. Our study was cross-sectional and used a consecutive sampling method. There were significant differences of IL-6 and ROS levels in all groups (p = 0.000, p = 0.049 respectively) and a significant correlation between cortisol and ROS in the RAS group without atopy (r = -0.985, p = 0.015). Serum IL-6 and ROS measurement may be used for detecting RAS caused by malnutrition or atopy but not cortisol for patients without psychological stress detected. This is consistent with the results of a very strong correlation with a negative value between cortisol and ROS in RAS without atopy.","PeriodicalId":16255,"journal":{"name":"Journal of Mathematical and Fundamental Sciences","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2020-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78842330","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
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