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Faruq Mohammad - One of the best experts on this subject based on the ideXlab platform.
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evaluation of mechanical thermal and water absorption behaviors of Polyalthia longifolia seed reinforced vinyl ester composites
Carbohydrate Polymers, 2020Co-Authors: B Stalin, Nagaraj Nagaprasad, V Vignesh, M Ravichandran, N Rajini, Sikiru Oluwarotimi Ismail, Faruq MohammadAbstract:Abstract This study presented a novel utilization of biomass solid waste, named Polyalthia longifolia (Mast tree) seed as a reinforcement in a composite, using a compression molding technique. An attempt was made to reinforce vinyl ester matrix (VE) with Polyalthia longifolia seed filler (PLSF), ranging from 5 to 50 wt% loadings. Mechanical properties of the fabricated Polyalthia longifolia seed filler/vinyl ester (PLSF-VE) composite samples were tested and analyzed. The results showed that the PLSF-VE composite exhibited optimum mechanical properties at 25 % wt of filler loading; ultimate tensile strength and modulus were approximately 32.50 MPa and 1.23 GPa, respectively. The ultimate flexural, impact strengths and hardness were observed around 125 MPa, 31.09 kJ/m2 and 36.50, respectively. The heat deflection test and thermo-gravimetric analysis depicted that the PLSF-VE composites withstood up to 66 °C and 430 °C, respectively. Furthermore, the PLSF and its various composite samples were studied, using energy-dispersive X-ray (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM).
Yunhong Tan - One of the best experts on this subject based on the ideXlab platform.
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from Polyalthia to polyalthiopsis annonaceae transfer of species enlarges a previously monotypic genus
PhytoKeys, 2020Co-Authors: Bine Xue, Yunhong Tan, Hongbo Ding, Gang Yao, Yunyun Shao, Xiaojing FanAbstract:The genus Polyalthiopsis Chaowasku (Annonaceae) was a poorly known monotypic genus from Vietnam that was recently segregated from the highly polyphyletic genus Polyalthia s.l. The sister clade relationship between Polyalthiopsis and Miliusa was not well established in previous study. The phylogenetic position of two Polyalthia spp. from China, P. chinensis S.K.Wu ex P.T.Li and P. verrucipes C.Y.Wu ex P.T.Li, remains unresolved and is shown here to be phylogenetically affiliated with Polyalthiopsis. Phylogenetic analyses of six chloroplast regions (matK, ndhF, psbA-trnH, rbcL, trnL-F and ycf1; ca.7.3 kb, 60 accessions) unambiguously placed Polyalthia chinensis and P. verrucipes in the same clade with Polyalthiopsis floribunda (PP = 1, MPBS = 97%); the entire clade is sister to Miliusa with weak to strong support (PP = 1, MPBS = 54%). Polyalthia chinensis and P. verrucipes share several diagnostic characters with Polyalthiopsis floribunda, including the raised midrib on the upper surface of the leaf in vivo, conspicuous foliar glands when dried, petiole with transverse striations when dried and axillary inflorescences. The two species differ from Polyalthiopsis floribunda in having fewer flowers per inflorescence, longer linear petals and two ovules per carpel. On the basis of the combined molecular phylogenetic and morphological data, we propose two new combinations, Polyalthiopsis chinensis (S.K.Wu ex P.T.Li) B.Xue & Y.H.Tan and Polyalthiopsis verrucipes (C.Y.Wu ex P.T.Li) B.Xue & Y.H.Tan. The protologue of Polyalthia verrucipes did not include a description of the flowers, which we provide here. An updated description for the genus Polyalthiopsis and a key to species in the genus Polyalthiopsis is also provided.
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a new annonaceae genus wuodendron provides support for a post boreotropical origin of the asian neotropical disjunction in the tribe miliuseae
Taxon, 2018Co-Authors: Bine Xue, Yunhong Tan, Daniel C Thomas, Tanawat Chaowasku, Xue Liang Hou, Richard M K SaundersAbstract:Recent molecular and morphological studies have clarified generic circumscriptions in Annonaceae tribe Miliuseae and resulted in the segregation of disparate elements from the previously highly polyphyletic genus Polyalthia s.l. Several names in Polyalthia nevertheless remain unresolved, awaiting assignment to specific genera, including Polyalthia litseifolia . Phylogenetic analyses of seven chloroplast regions ( atpB-rbcL , matK , ndhF , psbA-trnH , rbcL , trnL-F , ycf1 ; ca. 8.3 kb, 116 accessions, including representatives of all currently accepted genera in subfamily Malmeoideae) unambiguously placed Polyalthia litseifolia in a clade with three accessions from Thailand, which have previously been shown to represent an undescribed genus sister to the Neotropical clade ( Desmopsis , Sapranthus , Stenanona , Tridimeris ) in the predominantly Asian tribe Miliuseae. The collective clade is sister to Meiogyne . Polyalthia litseifolia shares several diagnostic characters with most species in the Neotropical genera and Meiogyne , including: petals that are similar in shape and size in both whorls; multiple ovules per ovary in one or two rows; and lamelliform endosperm ruminations. It is distinct in being deciduous, bearing subpetiolar buds and having inflorescences growing from the leaf scar of the dropped leaves. Morphological comparisons and phylogenetic analyses corroborate its recognition as a new genus, which is formally described and illustrated here as Wuodendron . Polyalthia litseifolia is furthermore found to be conspecific with Desmos praecox , and the latter name is used as the basis for the name of the type. Molecular divergence time estimates under an uncorrelated lognormal relaxed clock place the Wuodendron -Neotropical clade split within the Miocene (ca. 14–12 Ma), highlighting the importance of post-boreotropical dispersal and vicariance in shaping intercontinental tropical disjunctions in Annonaceae.
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Polyalthia yingjiangensis sp nov annonaceae from the china myanmar border
Nordic Journal of Botany, 2017Co-Authors: Bine Xue, Yunyun Shao, Yunhong TanAbstract:Polyalthia yingjiangensis sp. nov. is described from the China/Myanmar border. It is distinct in having outer petals that are much shorter than the inner petals and having a very long pedicel. It is most similar to P. miliusoides I.M. Turner, but differs in having perianth parts that are glabrous adaxially and pubescent abaxially, thicker and sparsely pubescent pedicels, as well as verrucose and darker monocarps.
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the identity of Polyalthia florulenta annonaceae a second species of wangia in china
Phytotaxa, 2016Co-Authors: Bine Xue, Yunhong TanAbstract:The taxonomic placement of Polyalthia florulenta C.Y.Wu ex P.T.Li has not been clarified. Phylogenetic analyses of eight chloroplast regions ( matK , ndhF , ndhF-rpl32 , psbA-trnH , rbcL , rpl32-trnL , trnL-F and ycf1 ; ca. 9.2 kb, 66 taxa) unambiguously placed Polyalthia florulenta in a subclade of tribe Miliuseae, sister to Wangia saccopetaloides. Polyalthia flourulenta shares several diagnostic characters with Wangia saccopetaloides , including leaf-opposed inflorescences, sepaloid outer petals and saccate inner petals with basal glandular tissue. It differs from Wangia saccopetaloides in having membranous leaf laminas, single-flowered inflorescences, subglobose single-seeded monocarps, and spiniform endosperm rumination. On the basis of the combined molecular phylogenetic and morphological data, we propose a new combination, Wangia florulenta (C.Y.Wu ex P.T.Li) B.Xue. As the protologue description was based on material lacking mature flowers, we provide a detailed description of flower morphology. A key to species in the genus Wangia is also provided.
Bine Xue - One of the best experts on this subject based on the ideXlab platform.
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phylogenetic relationships of Polyalthia in fiji
PhytoKeys, 2020Co-Authors: Bine Xue, Yanwen Chen, Richard M K SaundersAbstract:The genus Polyalthia (Annonaceae) has undergone dramatic taxonomic changes in recent years. Nine Polyalthia species have historically been recognized in Fiji, all of which have subsequently been transferred to three different genera, viz. Goniothalamus, Huberantha and Meiogyne. The transfer of six of these species has received strong molecular phylogenetic support, although the other three species, Polyalthia amoena, P. capillata and P. loriformis [all transferred to Huberantha], have never previously been sampled in a phylogenetic study. We address this shortfall by sampling available herbarium specimens of all three species and integrating the data in a molecular phylogenetic analysis. The resultant phylogeny provides strong support for the transfer of these species to Huberantha. The taxonomic realignment of all nine Fijian species formerly classified in Polyalthia is also clearly demonstrated and supported by the resultant phylogeny. The updated taxonomic treatments of the nine species, a key to the three genera and a key to the Fijian Huberantha species are provided.
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from Polyalthia to polyalthiopsis annonaceae transfer of species enlarges a previously monotypic genus
PhytoKeys, 2020Co-Authors: Bine Xue, Yunhong Tan, Hongbo Ding, Gang Yao, Yunyun Shao, Xiaojing FanAbstract:The genus Polyalthiopsis Chaowasku (Annonaceae) was a poorly known monotypic genus from Vietnam that was recently segregated from the highly polyphyletic genus Polyalthia s.l. The sister clade relationship between Polyalthiopsis and Miliusa was not well established in previous study. The phylogenetic position of two Polyalthia spp. from China, P. chinensis S.K.Wu ex P.T.Li and P. verrucipes C.Y.Wu ex P.T.Li, remains unresolved and is shown here to be phylogenetically affiliated with Polyalthiopsis. Phylogenetic analyses of six chloroplast regions (matK, ndhF, psbA-trnH, rbcL, trnL-F and ycf1; ca.7.3 kb, 60 accessions) unambiguously placed Polyalthia chinensis and P. verrucipes in the same clade with Polyalthiopsis floribunda (PP = 1, MPBS = 97%); the entire clade is sister to Miliusa with weak to strong support (PP = 1, MPBS = 54%). Polyalthia chinensis and P. verrucipes share several diagnostic characters with Polyalthiopsis floribunda, including the raised midrib on the upper surface of the leaf in vivo, conspicuous foliar glands when dried, petiole with transverse striations when dried and axillary inflorescences. The two species differ from Polyalthiopsis floribunda in having fewer flowers per inflorescence, longer linear petals and two ovules per carpel. On the basis of the combined molecular phylogenetic and morphological data, we propose two new combinations, Polyalthiopsis chinensis (S.K.Wu ex P.T.Li) B.Xue & Y.H.Tan and Polyalthiopsis verrucipes (C.Y.Wu ex P.T.Li) B.Xue & Y.H.Tan. The protologue of Polyalthia verrucipes did not include a description of the flowers, which we provide here. An updated description for the genus Polyalthiopsis and a key to species in the genus Polyalthiopsis is also provided.
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a new annonaceae genus wuodendron provides support for a post boreotropical origin of the asian neotropical disjunction in the tribe miliuseae
Taxon, 2018Co-Authors: Bine Xue, Yunhong Tan, Daniel C Thomas, Tanawat Chaowasku, Xue Liang Hou, Richard M K SaundersAbstract:Recent molecular and morphological studies have clarified generic circumscriptions in Annonaceae tribe Miliuseae and resulted in the segregation of disparate elements from the previously highly polyphyletic genus Polyalthia s.l. Several names in Polyalthia nevertheless remain unresolved, awaiting assignment to specific genera, including Polyalthia litseifolia . Phylogenetic analyses of seven chloroplast regions ( atpB-rbcL , matK , ndhF , psbA-trnH , rbcL , trnL-F , ycf1 ; ca. 8.3 kb, 116 accessions, including representatives of all currently accepted genera in subfamily Malmeoideae) unambiguously placed Polyalthia litseifolia in a clade with three accessions from Thailand, which have previously been shown to represent an undescribed genus sister to the Neotropical clade ( Desmopsis , Sapranthus , Stenanona , Tridimeris ) in the predominantly Asian tribe Miliuseae. The collective clade is sister to Meiogyne . Polyalthia litseifolia shares several diagnostic characters with most species in the Neotropical genera and Meiogyne , including: petals that are similar in shape and size in both whorls; multiple ovules per ovary in one or two rows; and lamelliform endosperm ruminations. It is distinct in being deciduous, bearing subpetiolar buds and having inflorescences growing from the leaf scar of the dropped leaves. Morphological comparisons and phylogenetic analyses corroborate its recognition as a new genus, which is formally described and illustrated here as Wuodendron . Polyalthia litseifolia is furthermore found to be conspecific with Desmos praecox , and the latter name is used as the basis for the name of the type. Molecular divergence time estimates under an uncorrelated lognormal relaxed clock place the Wuodendron -Neotropical clade split within the Miocene (ca. 14–12 Ma), highlighting the importance of post-boreotropical dispersal and vicariance in shaping intercontinental tropical disjunctions in Annonaceae.
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Polyalthia yingjiangensis sp nov annonaceae from the china myanmar border
Nordic Journal of Botany, 2017Co-Authors: Bine Xue, Yunyun Shao, Yunhong TanAbstract:Polyalthia yingjiangensis sp. nov. is described from the China/Myanmar border. It is distinct in having outer petals that are much shorter than the inner petals and having a very long pedicel. It is most similar to P. miliusoides I.M. Turner, but differs in having perianth parts that are glabrous adaxially and pubescent abaxially, thicker and sparsely pubescent pedicels, as well as verrucose and darker monocarps.
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the identity of Polyalthia florulenta annonaceae a second species of wangia in china
Phytotaxa, 2016Co-Authors: Bine Xue, Yunhong TanAbstract:The taxonomic placement of Polyalthia florulenta C.Y.Wu ex P.T.Li has not been clarified. Phylogenetic analyses of eight chloroplast regions ( matK , ndhF , ndhF-rpl32 , psbA-trnH , rbcL , rpl32-trnL , trnL-F and ycf1 ; ca. 9.2 kb, 66 taxa) unambiguously placed Polyalthia florulenta in a subclade of tribe Miliuseae, sister to Wangia saccopetaloides. Polyalthia flourulenta shares several diagnostic characters with Wangia saccopetaloides , including leaf-opposed inflorescences, sepaloid outer petals and saccate inner petals with basal glandular tissue. It differs from Wangia saccopetaloides in having membranous leaf laminas, single-flowered inflorescences, subglobose single-seeded monocarps, and spiniform endosperm rumination. On the basis of the combined molecular phylogenetic and morphological data, we propose a new combination, Wangia florulenta (C.Y.Wu ex P.T.Li) B.Xue. As the protologue description was based on material lacking mature flowers, we provide a detailed description of flower morphology. A key to species in the genus Wangia is also provided.
B Stalin - One of the best experts on this subject based on the ideXlab platform.
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evaluation of mechanical thermal and water absorption behaviors of Polyalthia longifolia seed reinforced vinyl ester composites
Carbohydrate Polymers, 2020Co-Authors: B Stalin, Nagaraj Nagaprasad, V Vignesh, M Ravichandran, N Rajini, Sikiru Oluwarotimi Ismail, Faruq MohammadAbstract:Abstract This study presented a novel utilization of biomass solid waste, named Polyalthia longifolia (Mast tree) seed as a reinforcement in a composite, using a compression molding technique. An attempt was made to reinforce vinyl ester matrix (VE) with Polyalthia longifolia seed filler (PLSF), ranging from 5 to 50 wt% loadings. Mechanical properties of the fabricated Polyalthia longifolia seed filler/vinyl ester (PLSF-VE) composite samples were tested and analyzed. The results showed that the PLSF-VE composite exhibited optimum mechanical properties at 25 % wt of filler loading; ultimate tensile strength and modulus were approximately 32.50 MPa and 1.23 GPa, respectively. The ultimate flexural, impact strengths and hardness were observed around 125 MPa, 31.09 kJ/m2 and 36.50, respectively. The heat deflection test and thermo-gravimetric analysis depicted that the PLSF-VE composites withstood up to 66 °C and 430 °C, respectively. Furthermore, the PLSF and its various composite samples were studied, using energy-dispersive X-ray (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM).
Richard M K Saunders - One of the best experts on this subject based on the ideXlab platform.
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phylogenetic relationships of Polyalthia in fiji
PhytoKeys, 2020Co-Authors: Bine Xue, Yanwen Chen, Richard M K SaundersAbstract:The genus Polyalthia (Annonaceae) has undergone dramatic taxonomic changes in recent years. Nine Polyalthia species have historically been recognized in Fiji, all of which have subsequently been transferred to three different genera, viz. Goniothalamus, Huberantha and Meiogyne. The transfer of six of these species has received strong molecular phylogenetic support, although the other three species, Polyalthia amoena, P. capillata and P. loriformis [all transferred to Huberantha], have never previously been sampled in a phylogenetic study. We address this shortfall by sampling available herbarium specimens of all three species and integrating the data in a molecular phylogenetic analysis. The resultant phylogeny provides strong support for the transfer of these species to Huberantha. The taxonomic realignment of all nine Fijian species formerly classified in Polyalthia is also clearly demonstrated and supported by the resultant phylogeny. The updated taxonomic treatments of the nine species, a key to the three genera and a key to the Fijian Huberantha species are provided.
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a new annonaceae genus wuodendron provides support for a post boreotropical origin of the asian neotropical disjunction in the tribe miliuseae
Taxon, 2018Co-Authors: Bine Xue, Yunhong Tan, Daniel C Thomas, Tanawat Chaowasku, Xue Liang Hou, Richard M K SaundersAbstract:Recent molecular and morphological studies have clarified generic circumscriptions in Annonaceae tribe Miliuseae and resulted in the segregation of disparate elements from the previously highly polyphyletic genus Polyalthia s.l. Several names in Polyalthia nevertheless remain unresolved, awaiting assignment to specific genera, including Polyalthia litseifolia . Phylogenetic analyses of seven chloroplast regions ( atpB-rbcL , matK , ndhF , psbA-trnH , rbcL , trnL-F , ycf1 ; ca. 8.3 kb, 116 accessions, including representatives of all currently accepted genera in subfamily Malmeoideae) unambiguously placed Polyalthia litseifolia in a clade with three accessions from Thailand, which have previously been shown to represent an undescribed genus sister to the Neotropical clade ( Desmopsis , Sapranthus , Stenanona , Tridimeris ) in the predominantly Asian tribe Miliuseae. The collective clade is sister to Meiogyne . Polyalthia litseifolia shares several diagnostic characters with most species in the Neotropical genera and Meiogyne , including: petals that are similar in shape and size in both whorls; multiple ovules per ovary in one or two rows; and lamelliform endosperm ruminations. It is distinct in being deciduous, bearing subpetiolar buds and having inflorescences growing from the leaf scar of the dropped leaves. Morphological comparisons and phylogenetic analyses corroborate its recognition as a new genus, which is formally described and illustrated here as Wuodendron . Polyalthia litseifolia is furthermore found to be conspecific with Desmos praecox , and the latter name is used as the basis for the name of the type. Molecular divergence time estimates under an uncorrelated lognormal relaxed clock place the Wuodendron -Neotropical clade split within the Miocene (ca. 14–12 Ma), highlighting the importance of post-boreotropical dispersal and vicariance in shaping intercontinental tropical disjunctions in Annonaceae.
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molecular phylogenetic support for the taxonomic merger of fitzalania and meiogyne annonaceae new nomenclatural combinations under the conserved name meiogyne
Systematic Botany, 2014Co-Authors: Daniel C Thomas, Bine Xue, Tanawat Chaowasku, David M Johnson, Richard M K SaundersAbstract:Abstract Meiogyne (Annonaceae) currently comprises 15 species of trees and shrubs, distributed in India, Southeast Asia, Australasia, Micronesia and Polynesia. Previous molecular phylogenetic studies have shown that the Australian endemic genus Fitzalania (consisting of only two species) is nested within Meiogyne, and preliminary morphological data have indicated that several south Pacific Polyalthia species may be misclassified and also associated with Meiogyne. We use maximum parsimony, maximum likelihood and Bayesian analyses based on seven chloroplast regions (matK, ndhF, ndhF-rpl32, rbcL, rpl32-trnL, trnL-F and ycf1) to reconstruct the most comprehensive phylogeny of Meiogyne available to date, inclusive of 13 Meiogyne species, the two Fitzalania species, as well as four Polyalthia species from Fiji and Tonga. The results show that Fitzalania and the four Polyalthia species are nested within Meiogyne, and that two species, M. cylindrocarpa and M. stenopetala, are not natural as currently defined. Mei...
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further fragmentation of the polyphyletic genus Polyalthia annonaceae molecular phylogenetic support for a broader delimitation of marsypopetalum
Systematics and Biodiversity, 2011Co-Authors: Bine Xue, Johan B Mols, Paul J A Kesler, Richard M K SaundersAbstract:The species-rich genus Polyalthia has previously been shown to be highly polyphyletic, with species represented in at least five different clades. The Polyalthia species that are associated with Marsypopetalum and Trivalvaria (as revealed either by previous phylogenetic studies or inferred on the basis of comparative morphology) were included in a molecular phylogenetic study based on three chloroplast DNA regions (matK, rbcL and trnL-F). Maximum parsimony, maximum likelihood and Bayesian analyses consistently revealed that several Polyalthia species form a well-supported clade with Marsypopetalum pallidum, and that this clade is sister to Trivalvaria. Diagnostic morphological characters for the clades are re-evaluated and shown to be congruent with the molecular phylogeny. Five Polyalthia species (P. crassa, P. littoralis, P. lucida, P. modesta and P. tristis) are accordingly transferred to Marsypopetalum.
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reassignment of six Polyalthia species to the new genus maasia annonaceae molecular and morphological congruence
Systematic Botany, 2008Co-Authors: Johan B Mols, Paul J A Kesler, Steven H Rogstad, Richard M K SaundersAbstract:Recently published molecular phylogenies of the Annonaceae have confirmed the long-held hypothesis that the large paleo- tropical genus Polyalthia is polyphyletic. Species previously assigned to Polyalthia are now known to belong to up to six distinct, generally well-supported clades. Three members of a group of six species previously referred to as the Polyalthia hypoleuca complex form a monophyletic group (with 99% bootstrap support) that is only distantly related to the other species of Polyalthia sampled. Putative morphological synapo- morphies are assessed, and justification provided for validating a new generic name, Maasia. Six species names in the Polyalthia hypoleuca complex are accordingly transferred to Maasia: M. discolor, M. glauca, M. hypoleuca, M. multinervis, M. ovalifolia, and M. sumatrana.
