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RISS 인기검색어
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- 저자 : E.Shiva (검색결과 4 건)
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Diversity of the genus Sheathia (Batrachospermales, Rhodophyta) in northeast India and east Nepal
Orlando Necchi,John A. West,E. K. Ganesan,Farishta Yasmin,Shiva Kumar Rai,Natalia L. Rossignolo 한국조류학회I 2019 ALGAE Vol.34 No.4
Freshwater red algae of the order Batrachospermales are poorly studied in India and Nepal, especially on a molecularbasis. During a survey in northeast India and east Nepal, six populations of the genus Sheathia were found and analyzedusing molecular and morphological evidence. Phylogenetic analyses based on the rbcL gene sequences grouped allpopulations in a large clade including our S. arcuata specimens and others from several regions. Sheathia arcuata representsa species complex with a high sequence divergence and several smaller clades. Samples from India and Nepal weregrouped in three distinct clades with high support and representing new cryptic species: a clade formed by two samplesfrom India, which was named Sheathia assamica sp. nov.; one sample from India and one from Nepal formed anotherclade, named Sheathia indonepalensis sp. nov.; two samples from Nepal grouped with sequences from Hawaii and Indonesia(only ‘Chantransia’ stages) and gametophytes from Taiwan, named Sheathia dispersa sp. nov. Morphologicalcharacters of the specimens from these three species overlap one another and with the general circumscription of S. arcuata, which lacks the heterocortication (presence of bulbous cells in the cortical filaments) present in other species ofthe genus Sheathia. Although the region sampled is relatively restricted, the genetic diversity among specimens of thesethree groups was high and not closely related in the phylogenetic relationship with the other clades of S. arcuata. Thesedata corroborate information from other groups of organisms (e.g., land and aquatic plants) that indicates this region(Eastern Himalaya) as a hotspot of biodiversity.
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Diversity of the genus Sheathia (Batrachospermales, Rhodophyta) in northeast India and east Nepal
Necchi, Orlando Jr.,West, John A.,Ganesan, E.K.,Yasmin, Farishta,Rai, Shiva Kumar,Rossignolo, Natalia L. The Korean Society of Phycology 2019 ALGAE Vol.34 No.4
Freshwater red algae of the order Batrachospermales are poorly studied in India and Nepal, especially on a molecular basis. During a survey in northeast India and east Nepal, six populations of the genus Sheathia were found and analyzed using molecular and morphological evidence. Phylogenetic analyses based on the rbcL gene sequences grouped all populations in a large clade including our S. arcuata specimens and others from several regions. Sheathia arcuata represents a species complex with a high sequence divergence and several smaller clades. Samples from India and Nepal were grouped in three distinct clades with high support and representing new cryptic species: a clade formed by two samples from India, which was named Sheathia assamica sp. nov.; one sample from India and one from Nepal formed another clade, named Sheathia indonepalensis sp. nov.; two samples from Nepal grouped with sequences from Hawaii and Indonesia (only 'Chantransia' stages) and gametophytes from Taiwan, named Sheathia dispersa sp. nov. Morphological characters of the specimens from these three species overlap one another and with the general circumscription of S. arcuata, which lacks the heterocortication (presence of bulbous cells in the cortical filaments) present in other species of the genus Sheathia. Although the region sampled is relatively restricted, the genetic diversity among specimens of these three groups was high and not closely related in the phylogenetic relationship with the other clades of S. arcuata. These data corroborate information from other groups of organisms (e.g., land and aquatic plants) that indicates this region (Eastern Himalaya) as a hotspot of biodiversity.
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Nanofiller as Crosslinker for Halogen-Containing Elastomers
Sahoo, N.G.,Kumar, E.Shiva,Das, C.K.,Panda, A.B.,Pramanik, P. The Polymer Society of Korea 2003 Macromolecular Research Vol.11 No.6
A Zn ion-coated nanosilica filler has been developed and tested, in chlorosulfonated polyethylene (CSPE) and polychloroprene (CR), as a vulcanizing activator, cum was reinforcing filler. In this study, ZnO was replaced by the Zn ion-coated nanosilica filler with an aim of studying the dual role of this nanofiller in CSPE and CR. In the case of CSPE vulcanizates, the presence of MgO deteriorated the state and rate of cure when the Zn ion-coated nanosilica filler was used, but in the case of CR it improved the state of cure and enhanced the modulus and tensile strength. The Zn ion-coated filler proved to be a better reinforcing-cum-curing agent than was externally added ZnO and NA-22 also proved to be a better curative in the presence of the Zn ion-coated nanosilica filler for both CSPE and CR.
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