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Yoji Takeoka
Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya 464-8601, Japan
Mathematics

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The Temporal Variations in Sunspot Number, Geomagnetic aa index and Southern Oscillation Index Iratius Radiman; Hiroshi Miyake; Chatief Kunjaya; Yoji Takeoka; Muhamad Irfan Hakim; Zadrach L. Dupe
Jurnal Matematika & Sains Vol 7, No 1 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

A study of three monthly solar-terrestrial indices of mean sunspot number, geomagnetic aa index, and Southern Oscillation Index during period of 1882 to 2000 was carried out to find any consistent short –term periodicities. We found 19, 22, and 26-month periodicities persistently occur in the above data, i nstead of 11-year pattern. We suggest that they might have solar activity origin.
Direct Somatic Embryogenesis in Rice (Oryza sativa L.) : Structural and Developmental Patterns Totik Sri Mariani; Hiroshi Miyake; Yoji Takeoka
Jurnal Matematika & Sains Vol 7, No 2 (2002)
Publisher : Institut Teknologi Bandung

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Abstract

In this study, we used light microscopy to observe the structural and developmental pattern during direct somatic embryogenesis in rice (Oryza sativa L). Initiation of somatic embryogenesis revealed the origin of somatic embryo. It was unicellular origin from the epidermis of scutellum zygotic embryo. The polarity of somatic embryo established when the elongated embryo flattened at the apical end. On the onset of scutellum development, the scutellar notch was formed. In germinated somatic embryo, the shoot apex was connected with the root by the vascular bundle strands. This is an important characteristic of somatic embryo. The result led us to the conclusion that rice somatic embryos underwent the same structural and developmental pattern as that of rice zygotic embryo.
Co-Authors Chatief Kunjaya Hiroshi Miyake Iratius Radiman Muhamad Irfan Hakim Totik Sri Mariani Zadrach L. Dupe