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2. Aquaponics

Author

Takeuchi, Toshio, Endo, Masato, Aida, Katsumi, Editor-in-chief, Kaneko, Toyoji, Series editor, Kurokura, Hisashi, Series editor, Tokai, Tadashi, Series editor, and Takeuchi, Toshio, editor

Published
2017
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35. Nanostructured Si/SiO2 Quantum Wells

Author

Takeuchi, Toshio and Horikoshil, Yoshiji

Subjects
Technology & Engineering / Nanotechnology & Mems
Abstract

The motivation for developing light-emitting devices on an indirect transition semiconductor such as silicon has been widely discussed for Si/SiO2 nanostructures. In this chapter, we report on the fabrication of Si/SiO2 quantum-confined amorphous nanostructured films and their optical properties. The Si/SiO2 nanostructures comprising amorphous Si, SiO2, and Si/SiO2 multilayers are grown using ultrahigh vacuum radio frequency magnetron sputtering. Optical absorption coefficients of the Si/SiO2 nanostructures are evaluated with regard to tentative integrated Si thicknesses. Optical energy band gaps of the Si/SiO2 multilayer films are in accordance with the effective mass theory and described as E0 = 1.61 + 0.75d−2 eV at the Si layer-integrated thicknesses ranging from 0.5 to 6 nm. Quantum confinement effects in the Si/SiO2 nanostructures are inferred from optical transmittance and reflectance spectra. The rapid-thermal-annealed Si/SiO2 multilayer films demonstrate the intensified photoluminescence at ~1.45 eV due to the formation of nanocrystalline silicon. The temperature dependence of the nanocrystalline luminescence intensity shows the nonmonotonous behavior which is interpreted invoking the Kapoor model.

Published
2020

40. A novel transforming growth factor-[beta] superfamily member expressed in gonadal somatic cells enhances primordial germ cell and spermatogonial proliferation in rainbow trout (Oncorhynchus mykiss)

Author

Sawatari, Etsuko, Shikina, Shinya, Takeuchi, Toshio, and Yoshizaki, Goro

Subjects
Biological sciences
Abstract

To link to full-text access for this article, visit this link: http://dx.doi.org/10.1016/j.ydbio.2006.10.001 Byline: Etsuko Sawatari (a), Shinya Shikina (a), Toshio Takeuchi (a), Goro Yoshizaki (a)(b) Keywords: PGC; Spermatogonia; Sertoli cell; Cytokine; Trout Abbreviations: TGF-[beta], transforming growth factor-[beta]; PGC, primordial germ cell; dpf, days post fertilization; GSDF, gonadal soma-derived growth factor; pNA, gripNA oligonucleotide; GFP, green fluorescent protein; SSC, spermatogonial stem cell; CM, conditioned medium Abstract: Our understanding of the molecular mechanisms of primordial germ cell (PGC) proliferation in fish is rudimentary, but it is thought to be controlled by the surrounding somatic cells. We assumed that growth factors that are specifically involved in PGC proliferation are expressed predominantly in the surrounding genital ridge somatic cells. In order to isolate these growth factors, we compiled a complementary DNA (cDNA) subtractive library using cDNA from the genital ridges of 40-dpf rainbow trout embryos as the tester and cDNA from embryos without genital ridges as the driver. This approach identified a novel cytokine, designated gonadal soma-derived growth factor (GSDF), which is a member of the transforming growth factor (TGF)-[beta] superfamily. GSDF was expressed in the genital ridge somatic cells surrounding the PGCs during embryogenesis, and in both the granulosa and Sertoli cells at later stages. Inhibition of GSDF translation by antisense oligonucleotides suppressed PGC proliferation. Moreover, isolated testicular cells that were cultured with recombinant GSDF demonstrated dose-dependent proliferation of type-A spermatogonia; this effect was completely blocked by antiserum against GSDF. These results denote that GSDF, a novel member of the TGF-[beta] superfamily, plays an important role for proliferation of PGC and spermatogonia. Author Affiliation: (a) Department of Marine Biosciences, Tokyo University of Marine Science and Technology, 4-5-7 Konan, Minato-ku, Tokyo 108-8477, Japan (b) SORST, Japan Science and Technology Agency, 4-1-8 Honcho Kawaguchishi, Saitama 332-0012, Japan Article History: Received 24 April 2006; Revised 29 September 2006; Accepted 3 October 2006 Article Note: (footnote) [star] GSDF sequence data have been submitted to the DDBJ/EMBL/GenBank database under accession number DQ489287.

Published
2007

46. Growth and survival of post-larval abalone Haliotis diversicolor supertexta (lischke) using an alternative culture method in the light and dark

Author

Stott, Adrian E., Takeuchi, Toshio, and Koike, Yasuyuki

Subjects
Abalones -- Food and nutrition -- Research, Biological sciences, Zoology and wildlife conservation, Research, Food and nutrition
Abstract

ABSTRACT Stott's Abalone Postlarvae Production System (SAPPS) was developed as an alternative method for settling larvae and raising postlarval abalone. It allows continuous hatchery production of abalone without using live [...]

Published
2004

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