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Hiroshi Kawai - One of the best experts on this subject based on the ideXlab platform.
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taxonomy and species diversity of Padina dictyotales phaeophyceae from the indo pacific with the description of two new species
European Journal of Phycology, 2021Co-Authors: Ni-ni Win, Takeaki Hanyuda, Hiroshi Kawai, Mya Kyawt Wai, Paul John L Geraldino, Lawrence M Liao, Chaw Thiri Pyae Phyo Aye, Ni Ni Mar, Mutsunori TokeshiAbstract:Taxonomy, species diversity, and geographical distribution of the marine brown algal genus Padina (Dictyotales, Phaeophyceae) from tropical South-East Asian waters were investigated through a combi...
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Global Diversity and Geographic Distributions of Padina Species (Dictyotales, Phaeophyceae): New Insights Based on Molecular and Morphological Analyses.
Journal of phycology, 2020Co-Authors: Ni-ni Win, Takeaki Hanyuda, Hiroshi Kawai, Masayuki Uchimura, Aki Kato, Hiromori Shimabukuro, Mutsunori TokeshiAbstract:The taxonomic status and species diversity of the brown algal genus Padina (Dictyotales, Phaeophyceae) was assessed based on DNA sequences and the morpho-anatomy of specimens collected worldwide, especially from tropical and subtropical western Pacific regions. Phylogenetic analyses using chloroplast rbcL and mitochondrial cox3 gene sequences demonstrated four distinct clades for newly collected samples with high bootstrap support. Each species clade possesses a suite of morphological features that are not shared by any known species of Padina. These are P. imbricata sp. nov., Padina lutea sp. nov., P. moffittianoides sp. nov., and P. nitida sp. nov. The occurrence of these and other species of Padina clearly points to an elevated diversity of the genus in tropical/subtropical waters of the western Pacific. Phylogenetic analyses provided new insights into biogeographic characteristics of the genus, with many species in the Pacific Ocean showing shared/overlapping distributions, whereas species from the Mediterranean/Atlantic and/or the Indian Ocean tend to be confined to particular regions. Consideration has also been given to the evolutionary time frame of the genus Padina based on molecular time trees: a time tree of the concatenated data set (rbcL + cox3) revealed the estimated divergence time in the mid-Cretaceous, whereas those of cox3 and rbcL showed older estimates pointing to the periods of mid-Jurassic and Early Cretaceous, respectively.
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two new species of Padina dictyotales phaeophyceae from southern japan p ogasawaraensis sp nov and p reniformis sp nov based on morphology and molecular markers
Phycologia, 2018Co-Authors: Takeaki Hanyuda, Aki Kato, Hiroshi KawaiAbstract:Abstract:Two new bistratose species of the brown algal genus Padina, P. ogasawaraensis sp. nov. and P. reniformis, sp. nov., were discovered from Ogasawara and Okinawa Islands, and Kagoshima, Japan...
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four newly recorded species of the calcified marine brown macroalgal genus Padina dictyotales phaeophyceae for australia
Australian Systematic Botany, 2013Co-Authors: Zhongmin Sun, Takeaki Hanyuda, Alan J K Millar, Akira Kurihara, Carlos Frederico D Gurgel, Hiroshi KawaiAbstract:Molecular phylogenetic analyses based on plastid-encoded rbcL and mitochondrial cox3 gene sequences, in combination with morphological observations, revealed the existence of the following four bistratose Padina species previouslyunreportedfromAustraliancoasts:PadinacalcareaNi-Ni-Win,S.G.A.Draisma,W.F.Prud'hommevanReine& H.Kawai, characterised by its bright yellow-orange inferior thallus surface and chalky white, heavily calcified superior surface, and the presence of hairlines only on the inferior surface; P. macrophylla Ni-Ni-Win, M.Uchimura & H.Kawai, characterised by a moderately calcified thallus with broad, depressed hairlines on the inferior surface and narrow, not depressedhairlinesonthesuperiorsurface,thosehairlinesthatarelargelyspacedoneachsurface;P.moffittianaI.A.Abbott& Huisman, characterised by lightly calcified thalli with narrow, slightly depressed hairlines that are distributed in alternate sequencebetweenthetwosurfacesatunequaldistances,andbroadreproductivesoriinoneortworowsinthefertilezone;and P.okinawaensisNi-Ni-Win,S.Arai,M.Uchimura&H.Kawai,characterisedbyheavilycalcifiedthalli,exceptatthehairlines, which form an alternation of uncalcified furrows and calcified glabrous zones on the inferior surface. With the addition of these four species, 13 Padina species are known from Australia.
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morphological and molecular evidence for two new species of Padina dictyotales phaeophyceae p sulcata and p calcarea from the central indo pacific region
Phycologia, 2012Co-Authors: Takeaki Hanyuda, Eric Verheij, Stefano G A Draisma, Willem Prudhomme F Van Reine, Siew-moi Phang, Hiroshi KawaiAbstract:NI-NI-WIN, Hanyuda T., Draisma S.G.A., Verheij E., Prud'homme van Reine W.F., Lim P.-E., Phang S.-M., and Kawai H. 2012. Morphological and molecular evidence for two new species of Padina (Dictyotales, Phaeophyceae), P. sulcata and P. calcarea, from the central Indo-Pacific. Phycologia 51: 576–585. DOI: 10.2216/11-94.1 Two new species of Padina – 1. Padina sulcata sp. nov. and 2. P. calcarea sp. nov. – from Malaysia, Indonesia and Palau were described based on morphological and molecular phylogenetic observations. Padina sulcata was a three-layered species characterised by a covering of thick fibrous hairs from the base to the middle of the inferior surface (away from the in-rolled margin) of the thallus; conspicuous equally spaced hairlines that alternated between both frond surfaces; and broad, indusiate oogonial and tetrasporangial sori that occupied nearly the entire fertile zones, and the fertile zones were separated by sterile zones of equal width. Padina calcarea was a two-layered species character...
Takeaki Hanyuda - One of the best experts on this subject based on the ideXlab platform.
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taxonomy and species diversity of Padina dictyotales phaeophyceae from the indo pacific with the description of two new species
European Journal of Phycology, 2021Co-Authors: Ni-ni Win, Takeaki Hanyuda, Hiroshi Kawai, Mya Kyawt Wai, Paul John L Geraldino, Lawrence M Liao, Chaw Thiri Pyae Phyo Aye, Ni Ni Mar, Mutsunori TokeshiAbstract:Taxonomy, species diversity, and geographical distribution of the marine brown algal genus Padina (Dictyotales, Phaeophyceae) from tropical South-East Asian waters were investigated through a combi...
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Global Diversity and Geographic Distributions of Padina Species (Dictyotales, Phaeophyceae): New Insights Based on Molecular and Morphological Analyses.
Journal of phycology, 2020Co-Authors: Ni-ni Win, Takeaki Hanyuda, Hiroshi Kawai, Masayuki Uchimura, Aki Kato, Hiromori Shimabukuro, Mutsunori TokeshiAbstract:The taxonomic status and species diversity of the brown algal genus Padina (Dictyotales, Phaeophyceae) was assessed based on DNA sequences and the morpho-anatomy of specimens collected worldwide, especially from tropical and subtropical western Pacific regions. Phylogenetic analyses using chloroplast rbcL and mitochondrial cox3 gene sequences demonstrated four distinct clades for newly collected samples with high bootstrap support. Each species clade possesses a suite of morphological features that are not shared by any known species of Padina. These are P. imbricata sp. nov., Padina lutea sp. nov., P. moffittianoides sp. nov., and P. nitida sp. nov. The occurrence of these and other species of Padina clearly points to an elevated diversity of the genus in tropical/subtropical waters of the western Pacific. Phylogenetic analyses provided new insights into biogeographic characteristics of the genus, with many species in the Pacific Ocean showing shared/overlapping distributions, whereas species from the Mediterranean/Atlantic and/or the Indian Ocean tend to be confined to particular regions. Consideration has also been given to the evolutionary time frame of the genus Padina based on molecular time trees: a time tree of the concatenated data set (rbcL + cox3) revealed the estimated divergence time in the mid-Cretaceous, whereas those of cox3 and rbcL showed older estimates pointing to the periods of mid-Jurassic and Early Cretaceous, respectively.
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two new species of Padina dictyotales phaeophyceae from southern japan p ogasawaraensis sp nov and p reniformis sp nov based on morphology and molecular markers
Phycologia, 2018Co-Authors: Takeaki Hanyuda, Aki Kato, Hiroshi KawaiAbstract:Abstract:Two new bistratose species of the brown algal genus Padina, P. ogasawaraensis sp. nov. and P. reniformis, sp. nov., were discovered from Ogasawara and Okinawa Islands, and Kagoshima, Japan...
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four newly recorded species of the calcified marine brown macroalgal genus Padina dictyotales phaeophyceae for australia
Australian Systematic Botany, 2013Co-Authors: Zhongmin Sun, Takeaki Hanyuda, Alan J K Millar, Akira Kurihara, Carlos Frederico D Gurgel, Hiroshi KawaiAbstract:Molecular phylogenetic analyses based on plastid-encoded rbcL and mitochondrial cox3 gene sequences, in combination with morphological observations, revealed the existence of the following four bistratose Padina species previouslyunreportedfromAustraliancoasts:PadinacalcareaNi-Ni-Win,S.G.A.Draisma,W.F.Prud'hommevanReine& H.Kawai, characterised by its bright yellow-orange inferior thallus surface and chalky white, heavily calcified superior surface, and the presence of hairlines only on the inferior surface; P. macrophylla Ni-Ni-Win, M.Uchimura & H.Kawai, characterised by a moderately calcified thallus with broad, depressed hairlines on the inferior surface and narrow, not depressedhairlinesonthesuperiorsurface,thosehairlinesthatarelargelyspacedoneachsurface;P.moffittianaI.A.Abbott& Huisman, characterised by lightly calcified thalli with narrow, slightly depressed hairlines that are distributed in alternate sequencebetweenthetwosurfacesatunequaldistances,andbroadreproductivesoriinoneortworowsinthefertilezone;and P.okinawaensisNi-Ni-Win,S.Arai,M.Uchimura&H.Kawai,characterisedbyheavilycalcifiedthalli,exceptatthehairlines, which form an alternation of uncalcified furrows and calcified glabrous zones on the inferior surface. With the addition of these four species, 13 Padina species are known from Australia.
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morphological and molecular evidence for two new species of Padina dictyotales phaeophyceae p sulcata and p calcarea from the central indo pacific region
Phycologia, 2012Co-Authors: Takeaki Hanyuda, Eric Verheij, Stefano G A Draisma, Willem Prudhomme F Van Reine, Siew-moi Phang, Hiroshi KawaiAbstract:NI-NI-WIN, Hanyuda T., Draisma S.G.A., Verheij E., Prud'homme van Reine W.F., Lim P.-E., Phang S.-M., and Kawai H. 2012. Morphological and molecular evidence for two new species of Padina (Dictyotales, Phaeophyceae), P. sulcata and P. calcarea, from the central Indo-Pacific. Phycologia 51: 576–585. DOI: 10.2216/11-94.1 Two new species of Padina – 1. Padina sulcata sp. nov. and 2. P. calcarea sp. nov. – from Malaysia, Indonesia and Palau were described based on morphological and molecular phylogenetic observations. Padina sulcata was a three-layered species characterised by a covering of thick fibrous hairs from the base to the middle of the inferior surface (away from the in-rolled margin) of the thallus; conspicuous equally spaced hairlines that alternated between both frond surfaces; and broad, indusiate oogonial and tetrasporangial sori that occupied nearly the entire fertile zones, and the fertile zones were separated by sterile zones of equal width. Padina calcarea was a two-layered species character...
Aguilar-estrada, Luis Gabriel - One of the best experts on this subject based on the ideXlab platform.
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Algas epífitas en Padina durvillei y Padina crispata (Dyctiotaceae, Phaeophyceae) en el Pacífico tropical mexicano
'Instituto de Ecologia A.C.', 2020Co-Authors: Álvarez-Álvarez, Javier Emiliano, Quiroz-gonzález Nataly, Rodríguez-muñoz, Diana Laura, Aguilar-estrada, Luis GabrielAbstract:Background and Aims: In Mexico, knowledge of epiphytism in marine environments has focused on pasture communities, while for algae there are only four studies, two for the North Pacific of Mexico and two more for Veracruz. Due to the lack of information, the present work intends to contribute to the knowledge of the epiphytism presented in two species of Padina of wide distribution along the coasts of the Mexican tropical Pacific. Methods: Two sampling periods were carried out in four locations in Nayarit. The collected material was preserved in 4% formaldehyde. Thallus determinations of Padina crispata and P. durvillei were made, observations of the epiphyte thallus were carried out and cuts were observed with stereoscopic and optical microscopes. The identification was carried out with specialized literature. In addition, a bibliographic review was made with works about the coasts of the Mexican tropical Pacific. Key results: In total 71 epiphytic species of Padina crispata and P. durvillei were identified, distributed in 51 genera, 35 families, 22 orders and four phyla. The order with the highest number of recorded species was Ceramiales with 17, followed by Corallinales with 14, while the best represented families were Corallinaceae and Ceramiaceae with 11 and nine species, respectively. Eight species were found for the first time in Nayarit, of which Acrochaetium barbadense is a new record for the Mexican tropical Pacific. The greatest richness of epiphytic species occurred in Padina durvillei (58, 80.5 %). Conclusions: The importance of Padina durvillei and P. crispata as basibionts for different groups of algae is highlighted, as well as the value they present in the knowledge of biodiversity.Antecedentes y Objetivos: En México el conocimiento de epifitismo en ambientes marinos se ha enfocado en las comunidades de pastos, mientras que para las algas únicamente se cuenta con cuatro estudios, dos para el Pacífico norte de México y dos para Veracruz. Debido a la escasez de información, el presente trabajo es una contribución importante al conocimiento del epifitismo en dos especies de Padina de amplia distribución en las costas del Pacífico tropical mexicano. Métodos: Se llevaron a cabo dos periodos de muestreo en cuatro localidades de Nayarit. El material recolectado fue preservado en formaldehído a 4%. Se realizaron las determinaciones de Padina durvillei y P. crispata, a partir de observaciones de los talos epífitos, realizando y analizando cortes al microscopio estereoscópico y óptico. La identificación se realizó utilizando literatura especializada. Para corroborar la determinación y conocer la distribución de las especies, se llevó a cabo la revisión bibliográfica de trabajos ficológicos sobre las costas del Pacifico tropical mexicano. Resultados clave: En total se identificaron 71 especies epífitas de Padina crispata y P. durvillei, distribuidos en 51 géneros, 35 familias, 22 órdenes y cuatro phyla. El orden con mayor número de especies registradas fue Ceramiales con 17, seguido de Corallinales con 14, mientras que las familias mejor representadas fueron Corallinaceae y Ceramiaceae con 11 y nueve especies respectivamente. Se encontraron por primera vez ocho especies para Nayarit, de las cuales Acrochaetium barbadense es un nuevo registro para el Pacifico tropical mexicano. La mayor riqueza de especies epífitas (58, 80.5%) se presentó en Padina durvillei. Conclusiones: Se destaca la importancia de Padina durvillei y P. crispata como basibiontes para diferentes grupos de algas, así como el valor que éstas presentan en el conocimiento de la biodiversidad.
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Epiphytic algae in Padina durvillei and P. crispata (Dyctiotaceae, Phaeophyceae) in the Mexican tropical Pacific
'Instituto de Ecologia A.C.', 2020Co-Authors: Álvarez-Álvarez, Javier Emiliano, Quiroz-gonzález Nataly, Rodríguez-muñoz, Diana Laura, Aguilar-estrada, Luis GabrielAbstract:Antecedentes y Objetivos: En México el conocimiento de epifitismo en ambientes marinos se ha enfocado en las comunidades de pastos, mientras que para las algas únicamente se cuenta con cuatro estudios, dos para el Pacífico norte de México y dos para Veracruz. Debido a la escasez de información, el presente trabajo es una contribución importante al conocimiento del epifitismo en dos especies de Padina de amplia distribución en las costas del Pacífico tropical mexicano. Métodos: Se llevaron a cabo dos periodos de muestreo en cuatro localidades de Nayarit. El material recolectado fue preservado en formaldehído a 4%. Se realizaron las determinaciones de Padina durvillei y P. crispata, a partir de observaciones de los talos epífitos, realizando y analizando cortes al microscopio estereoscópico y óptico. La identificación se realizó utilizando literatura especializada. Para corroborar la determinación y conocer la distribución de las especies, se llevó a cabo la revisión bibliográfica de trabajos ficológicos sobre las costas del Pacifico tropical mexicano. Resultados clave: En total se identificaron 71 especies epífitas de Padina crispata y P. durvillei, distribuidos en 51 géneros, 35 familias, 22 órdenes y cuatro phyla. El orden con mayor número de especies registradas fue Ceramiales con 17, seguido de Corallinales con 14, mientras que las familias mejor representadas fueron Corallinaceae y Ceramiaceae con 11 y nueve especies respectivamente. Se encontraron por primera vez ocho especies para Nayarit, de las cuales Acrochaetium barbadense es un nuevo registro para el Pacifico tropical mexicano. La mayor riqueza de especies epífitas (58, 80.5%) se presentó en Padina durvillei. Conclusiones: Se destaca la importancia de Padina durvillei y P. crispata como basibiontes para diferentes grupos de algas, así como el valor que éstas presentan en el conocimiento de la biodiversidad. Background and Aims: In Mexico, knowledge of epiphytism in marine environments has focused on pasture communities, while for algae there are only four studies, two for the North Pacific of Mexico and two more for Veracruz. Due to the lack of information, the present work intends to contribute to the knowledge of the epiphytism presented in two species of Padina of wide distribution along the coasts of the Mexican tropical Pacific. Methods: Two sampling periods were carried out in four locations in Nayarit. The collected material was preserved in 4% formaldehyde. Thallus determinations of Padina crispata and P. durvillei were made, observations of the epiphyte thallus were carried out and cuts were observed with stereoscopic and optical microscopes. The identification was carried out with specialized literature. In addition, a bibliographic review was made with works about the coasts of the Mexican tropical Pacific. Key results: In total 71 epiphytic species of Padina crispata and P. durvillei were identified, distributed in 51 genera, 35 families, 22 orders and four phyla. The order with the highest number of recorded species was Ceramiales with 17, followed by Corallinales with 14, while the best represented families were Corallinaceae and Ceramiaceae with 11 and nine species, respectively. Eight species were found for the first time in Nayarit, of which Acrochaetium barbadense is a new record for the Mexican tropical Pacific. The greatest richness of epiphytic species occurred in Padina durvillei (58, 80.5 %). Conclusions: The importance of Padina durvillei and P. crispata as basibionts for different groups of algae is highlighted, as well as the value they present in the knowledge of biodiversity
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Algas epífitas en Padina durvillei y Padina crispata (Dyctiotaceae, Phaeophyceae) en el Pacífico tropical mexicano
2020Co-Authors: Álvarez-Álvarez, Javier Emiliano, Quiroz-gonzález Nataly, Rodríguez-muñoz, Diana Laura, Aguilar-estrada, Luis GabrielAbstract:Background and Aims: In Mexico, knowledge of epiphytism in marine environments has focused on pasture communities, while for algae there are only four studies, two for the North Pacific of Mexico and two more for Veracruz. Due to the lack of information, the present work intends to contribute to the knowledge of the epiphytism presented in two species of Padina of wide distribution along the coasts of the Mexican tropical Pacific. Methods: Two sampling periods were carried out in four locations in Nayarit. The collected material was preserved in 4% formaldehyde. Thallus determinations of Padina crispata and P. durvillei were made, observations of the epiphyte thallus were carried out and cuts were observed with stereoscopic and optical microscopes. The identification was carried out with specialized literature. In addition, a bibliographic review was made with works about the coasts of the Mexican tropical Pacific. Key results: In total 71 epiphytic species of Padina crispata and P. durvillei were identified, distributed in 51 genera, 35 families, 22 orders and four phyla. The order with the highest number of recorded species was Ceramiales with 17, followed by Corallinales with 14, while the best represented families were Corallinaceae and Ceramiaceae with 11 and nine species, respectively. Eight species were found for the first time in Nayarit, of which Acrochaetium barbadense is a new record for the Mexican tropical Pacific. The greatest richness of epiphytic species occurred in Padina durvillei (58, 80.5 %). Conclusions: The importance of Padina durvillei and P. crispata as basibionts for different groups of algae is highlighted, as well as the value they present in the knowledge of biodiversity.Antecedentes y Objetivos: En México el conocimiento de epifitismo en ambientes marinos se ha enfocado en las comunidades de pastos, mientras que para las algas únicamente se cuenta con cuatro estudios, dos para el Pacífico norte de México y dos para Veracruz. Debido a la escasez de información, el presente trabajo es una contribución importante al conocimiento del epifitismo en dos especies de Padina de amplia distribución en las costas del Pacífico tropical mexicano.Métodos: Se llevaron a cabo dos periodos de muestreo en cuatro localidades de Nayarit. El material recolectado fue preservado en formaldehído a 4%. Se realizaron las determinaciones de Padina durvillei y P. crispata, a partir de observaciones de los talos epífitos, realizando y analizando cortes al microscopio estereoscópico y óptico. La identificación se realizó utilizando literatura especializada. Para corroborar la determinación y conocer la distribución de las especies, se llevó a cabo la revisión bibliográfica de trabajos ficológicos sobre las costas del Pacifico tropical mexicano.Resultados clave: En total se identificaron 71 especies epífitas de Padina crispata y P. durvillei, distribuidos en 51 géneros, 35 familias, 22 órdenes y cuatro phyla. El orden con mayor número de especies registradas fue Ceramiales con 17, seguido de Corallinales con 14, mientras que las familias mejor representadas fueron Corallinaceae y Ceramiaceae con 11 y nueve especies respectivamente. Se encontraron por primera vez ocho especies para Nayarit, de las cuales Acrochaetium barbadense es un nuevo registro para el Pacifico tropical mexicano. La mayor riqueza de especies epífitas (58, 80.5%) se presentó en Padina durvillei.Conclusiones: Se destaca la importancia de Padina durvillei y P. crispata como basibiontes para diferentes grupos de algas, así como el valor que éstas presentan en el conocimiento de la biodiversidad.Palabras clave: algas pardas, biodiversidad, epibiosis, ficoflora, intermareal.
Mutsunori Tokeshi - One of the best experts on this subject based on the ideXlab platform.
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taxonomy and species diversity of Padina dictyotales phaeophyceae from the indo pacific with the description of two new species
European Journal of Phycology, 2021Co-Authors: Ni-ni Win, Takeaki Hanyuda, Hiroshi Kawai, Mya Kyawt Wai, Paul John L Geraldino, Lawrence M Liao, Chaw Thiri Pyae Phyo Aye, Ni Ni Mar, Mutsunori TokeshiAbstract:Taxonomy, species diversity, and geographical distribution of the marine brown algal genus Padina (Dictyotales, Phaeophyceae) from tropical South-East Asian waters were investigated through a combi...
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Global Diversity and Geographic Distributions of Padina Species (Dictyotales, Phaeophyceae): New Insights Based on Molecular and Morphological Analyses.
Journal of phycology, 2020Co-Authors: Ni-ni Win, Takeaki Hanyuda, Hiroshi Kawai, Masayuki Uchimura, Aki Kato, Hiromori Shimabukuro, Mutsunori TokeshiAbstract:The taxonomic status and species diversity of the brown algal genus Padina (Dictyotales, Phaeophyceae) was assessed based on DNA sequences and the morpho-anatomy of specimens collected worldwide, especially from tropical and subtropical western Pacific regions. Phylogenetic analyses using chloroplast rbcL and mitochondrial cox3 gene sequences demonstrated four distinct clades for newly collected samples with high bootstrap support. Each species clade possesses a suite of morphological features that are not shared by any known species of Padina. These are P. imbricata sp. nov., Padina lutea sp. nov., P. moffittianoides sp. nov., and P. nitida sp. nov. The occurrence of these and other species of Padina clearly points to an elevated diversity of the genus in tropical/subtropical waters of the western Pacific. Phylogenetic analyses provided new insights into biogeographic characteristics of the genus, with many species in the Pacific Ocean showing shared/overlapping distributions, whereas species from the Mediterranean/Atlantic and/or the Indian Ocean tend to be confined to particular regions. Consideration has also been given to the evolutionary time frame of the genus Padina based on molecular time trees: a time tree of the concatenated data set (rbcL + cox3) revealed the estimated divergence time in the mid-Cretaceous, whereas those of cox3 and rbcL showed older estimates pointing to the periods of mid-Jurassic and Early Cretaceous, respectively.
Mohammad Hassan Khani - One of the best experts on this subject based on the ideXlab platform.
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statistical analysis and isotherm study of uranium biosorption by Padina sp algae biomass
Environmental Science and Pollution Research, 2011Co-Authors: Mohammad Hassan KhaniAbstract:The application of response surface methodology is presented for optimizing the removal of U ions from aqueous solutions using Padina sp., a brown marine algal biomass. Box–Wilson central composite design was employed to assess individual and interactive effects of the four main parameters (pH and initial uranium concentration in solutions, contact time and temperature) on uranium uptake. Response surface analysis showed that the data were adequately fitted to second-order polynomial model. Analysis of variance showed a high coefficient of determination value (R 2 = 0.9746) and satisfactory second-order regression model was derived. The optimum pH and initial uranium concentration in solutions, contact time and temperature were found to be 4.07, 778.48 mg/l, 74.31 min, and 37.47°C, respectively. Maximized uranium uptake was predicted and experimentally validated. The equilibrium data for biosorption of U onto the Padina sp. were well represented by the Langmuir isotherm, giving maximum monolayer adsorption capacity as high as 376.73 mg/g.
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uranium biosorption by Padina sp algae biomass kinetics and thermodynamics
Environmental Science and Pollution Research, 2011Co-Authors: Mohammad Hassan KhaniAbstract:Introduction Kinetic, thermodynamic, and equilibrium isotherms of the biosorption of uranium ions onto Padina sp., a brown algae biomass, in a batch system have been studied.
