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- 저자 : Hari Sutrisno (검색결과 4 건)
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Synthesis of TiO2-polycrystalline microspheres and its microstructure at various high temperatures
Hari Sutrisno 한양대학교 세라믹연구소 2017 Journal of Ceramic Processing Research Vol.18 No.5
TiO2-polycristalline microspheres were prepared by wet chemical synthesis using titanium aquo oxo chloride([Ti8O12(H2O)24]Cl8.HCl.7H2O) as titanium source. The morphology and structure of sample was observed using highresolution scanning electron microscopy (HR-SEM), high resolution transmission electron microscopy (HR-TEM), FT-Ramanspectroscopy, FT-IR spectroscopy, X-ray diffraction (XRD) and high temperature X-ray diffraction (HT-XRD). Microstructureof TiO2 phases were determined from HT-XRD measurement data at various temperatures from 100 oC to 1000 oC at intervalsof 50 oC. The morphology of sample shows a distribution of microspheres of approximately 0.5 to 1.0 mm. Detailedmeasurements of sample from XRD spectra exhibit monoclinic structure (TiO2(B) phase) of TiO2-polycristalline microspheres. The HT-XRD results indicated that diffraction peaks of TiO2-polycrystalline microspheres are indexed as TiO2(B) phase from100 to 250 oC and as anatase phase from 300 to 650 oC, while mixed crystals of anatase and rutile were observed attemperatures measurement from 700 to 800oC. Finally, pure rutile phase has formed at temperatures measurement from 850to 1000 oC. The results of microstructure analysis show that the anatase structure could be indexed to I41/amd (no. 141) spacegroup with tetragonal symmetry at temperatures measurement: 600 and 750 oC, while the rutile structure could be indexedto P42/mnm (no. 136) space group with tetragonal symmetry at 750 and 950 oC.
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Sutrisno, Hari The National Institute of Biological Resources 2015 Journal of species research Vol.4 No.1
Zeuzera is one of the most important wood borer pests in South East Asia. Like of most other genera of moths, the systematic of this genus is still in dispute, especially on the monophyly and the relationship within this genus due to the fact that genus is very varied. This genus was defined based on external characters only such as cross vein Sc-Rs present, humeral plate approximately triangular in shape and anal plate moderately long to moderately short. Therefore, the monophyly of this genus need to be evaluated based on more comprehensive data. To clarify the monophyly of the genus Zeuzera, to reveal the phylogenetic relationships among the Indonesian species, and to establish the genetic characters of Indonesian Zeuzera, we analyzed seven species of Indonesian Zeuzera including three other species distributed around the world based on nucleotide sequence variation across a 580-bp region in the CO I gene. The results showed that the monophyly of Zeuzera was supported by bootstrap tests at the MP and ML tree building methods (>95%). Genus Zeuzera was divided into two groups (A and B) with Z. borneana was excluded from the two groups and occupied at the basal node. Indonesian species was distributed into two different clades. CO I gene alone was able to fully resolve the relationships among species within clade B. However, further investigations were needed by including more species and other genes that the more conserved to test the validity of the phylogenetic hypothesis proposed here.
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Sutrisno, Hari The National Institute of Biological Resources 2014 Journal of species research Vol.3 No.1
Many species of Lymantria are important forestry pests, including L. dispar which is well known distributed from Asia to North America as an invasive species. Like of most other genera of moths, the systematic of this genus is still in dispute, especially on the monophyly and the relationship within this genus due to the fact that genus is very large and varied. This genus was morphologically defined only by a single aphomorphy. To clarify the monophyly of the genus Lymantria, to reveal the phylogenetic relationship among the Indonesian species, and to establish the genetic characters of Indonesian Lymantria, we analyzed 9 species of Indonesian Lymantria involving 33 other species distributed around the world based on nucleotide sequence variation across a 516-bp region in the CO I gene. The results showed that the base composition of this region was a high A+T biased (C: 0.3333). The results also showed that the monophyly of Lymantria was not supported by bootstrap tests at any tree building methods. Indonesian species was distributed into four different groups but the relationship among them was still in dispute. It indicates that relationships among the basal nodes (groups) proposed here were least valid due to the fact that the number of species may not be enough to represent the real number of species in the nature. Moreover CO I gene sequences alone were not able to resolve their relationships at the basal nodes. More investigations were needed by including more species and other genes that the more conserved.
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Hari Sutrisno 국립생물자원관 2015 Journal of species research Vol.4 No.1
Zeuzera is one of the most important wood borer pests in South East Asia. Like of most other genera of moths, the systematic of this genus is still in dispute, especially on the monophyly and the relationship within this genus due to the fact that genus is very varied. This genus was defined based on external characters only such as cross vein Sc-Rs present, humeral plate approximately triangular in shape and anal plate moderately long to moderately short. Therefore, the monophyly of this genus need to be evaluated based on more comprehensive data. To clarify the monophyly of the genus Zeuzera, to reveal the phylogenetic relationships among the Indonesian species, and to establish the genetic characters of Indonesian Zeuzera, we analyzed seven species of Indonesian Zeuzera including three other species distributed around the world based on nucleotide sequence variation across a 580-bp region in the CO I gene. The results showed that the monophyly of Zeuzera was supported by bootstrap tests at the MP and ML tree building methods (¤95%). Genus Zeuzera was divided into two groups (A and B) with Z. borneana was excluded from the two groups and occupied at the basal node. Indonesian species was distributed into two different clades. CO I gene alone was able to fully resolve the relationships among species within clade B. However, further investigations were needed by including more species and other genes that the more conserved to test the validity of the phylogenetic hypothesis proposed here.
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