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In vitro Antibacterial Activity of Moringa oleifera Ethanolic Extract against Tomato Phytopathogenic Bacteria

Phyton-International Journal of Experimental Botany 2021年第3期90卷 895-906页

作者： Roberto Arredondo-Valdés Francisco D.Hernández-Castillo Mario Rocandio-Rodríguez Julia C.Anguiano-Cabello madai rosas-mejía Venancio Vanoye-Eligio Salvador Ordaz-Silva Imelda V.López-Sánchez Laura D.Carrazco-Peña Julio C.Chacón-Hernández Institute of Applied Ecology Universidad Autónoma de TamaulipasCiudad VictoriaTamaulipas87019México Parasitology Department Universidad Autónoma Agraria Antonio NarroSaltillo25315México Health Area Universidad La Salle SaltilloSaltillo25298México Faculty of Engineering and Business San Quintin Universidad Autónoma de Baja CaliforniaSan Quintín22930México

The tomato(Solanum lycopersicum L.)is one of the world’s most important vegetable ***,phytopathogenic bacteria affect the yield and quality of tomato cultivation,like Agrobacterium tumefeciens(At),Clavibacter michiganensis ***(Cmm),Pseudomonas syringae ***(Pst),Ralstonia solanacearum(Rs),and Xanthomonas axonopodis(Xa).Synthetic chemical products are used mostly on disease plant control,but overuse generates resistance to bacterial *** study aimed to evaluate the in vitro antibacterial activity of the ethanolic extract of Moringa oleifera *** against At,Cmm,Pst,Rs,and Xa,as well as information about this plant species’chemical *** activity against pathogens observed by microplate technique,phytochemical screening,and FTIR analysis revealed different bio-active compounds on ethanolic extracts with antibacterial *** growth inhibition rate ranged between 0.08%and 99.94%.The inhibitory concentration,IC50,required to inhibit 50%of At,Cmm,Pst,Rs,and Xa bacterial growth,was 276.67,350.48,277.85,351.49,and 283.22 mg/L,*** of phytopathogen bacteria’s growth increased as the concentrations of the extract also *** oleifera extract can be recommended as a potent bio-bactericide.

关键词： Biological control secondary metabolites tomato crop inhibitory concentration botanical extract

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Accuracy of common stem volume formulae using terrestrial photogrammetric point clouds:a case study with savanna trees in Benin

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Journal of Forestry Research 2021年第6期32卷 2415-2422页

作者： Hospice A.Akpo Gilbert Atindogbe Maxwell C.Obiakara Arios B.Adjinanoukon madai Gbedolo Noel H.Fonton Laboratoire d’Etudes et de Recherche en Statistiques et Biométrie Appliquee FSAUniversite D’Abomey-Calavi01 BP 526CotonouBenin Ecology Unity Department of BotanyUniversity of IbadanIbadan 20084Nigeria

Recent applications of digital photogrammetry in forestry have highlighted its utility as a viable mensuration ***,in tropical regions little research has been done on the accuracy of this approach for stem volume *** this study,the performance of Structure from Motion photogrammetry for estimating individual tree stem volume in relation to traditional approaches was *** selected 30 trees from five savanna species growing at the periphery of the W National Park in northern Benin and measured their circumferences at different heights using traditional tape and *** volumes of sample trees were estimated from the measured circumferences using nine volumetric formulae for solids of revolution,including cylinder,cone,paraboloid,neiloid and their respective *** tree was photographed and stem volume determined using a taper function derived from tri-dimensional stem *** reference volume was compared with the results of formulaic *** stem profiles were further decomposed into different portions,approximately corresponding to the stump,butt logs and logs,and the suitability of each solid of revolution was assessed for simulating the resulting *** volumes calculated using the fustrums of paraboloid and neiloid formulae were the closest to reference volumes with a bias and root mean square error of 8.0%and 24.4%,*** closely resembled fustrums of a paraboloid and a *** stem portions assumed different solids as follows:fustrums of paraboloid and neiloid were more prevalent from the stump to breast height,while a paraboloid closely matched stem shapes beyond this ***,a more accurate stem volumetric estimate was attained when stems were considered as a composite of at least three geometric solids.

关键词： Structure from motion photogrammetry Point cloud data Stem volume Savanna species Benin

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高梯度磁选机定向介质中的磁力

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国外金属矿选矿 1983年第9期 31-35页

作者： P.Mucha V.Hencl E.madai 刘树贻

导出了计算作用在高梯度磁选机定向介质空间中磁力的一个新公式。考虑了介质的几何形状和介质单体之间的相互作用。使棒形介质单体周围的与磁场强度有关的顺磁性流体上升高度可见的新方法,可证明磁力的理论计算,并可确定磁力的最有效方向。

关键词：高梯度磁选机磁性流体磁力磁流体铁流体胶体磁性颗粒磁性棒上升高度顺磁性球形颗粒磁场强度磁化力

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