Effects of magnesium oxide-added polyethylene-coated steel wire on the growth of attached marine diatom Nitzschia sp.

カキ養殖筏には多くの生物が付着し，中でもろ過摂食者は餌の摂取という点でカキと競合関係にあるため，カキの成長を阻害する要因の1つである。そこで，この研究では，カキ養殖に使われる針金について，生物付着の少ない素材を開発することを目的とし，従来の亜鉛メッキ鋼線に加え，アイオノマー・レジン（ポリエチレン）被覆鋼線，酸化マグネシウム（HUSR）混合ポリエチレン被膜鋼線（HUS混合率3％および5％）を用い，沿岸域に一般的な付着珪藻種Nitzschia sp.の増殖に対する影響を実験的に測定した。その結果，（1）ポリエチレン自体はNitzschia sp.の増殖を阻害しないが，亜鉛メッキ鋼線およびHUS混合ポリエチレン被覆鋼線はNitzschia sp.の増殖を阻害する，また（2）HUSR混合ポリエチレン被膜鋼線では，HUS混合率が高いほどNitzschia sp.の増殖阻害程度は強い，ということが明らかとなった。Many organisms attached on suspended oyster culture rafts, particularly filter-feeding animals can prevent growth of culturing oyster, because they are competing feeds with oyster in the same niche. In the present study, effects of steel wires coated with various materials on growth of the ubiquitous attached diatom Nitzschia sp. were experimentally examined to develop a better steel wire in terms of less attached organisms. The wire used were a normal zinc-galvanized steel wire, a polyethylene (ionomer resin)-coated steel wire, and magnesium oxide (HUS®)-added (3% and 5%) polyethylene coated steel wires. Following results were obtained, (1) all wires coated with different materials except the ionomer resin itself (as coating material) suppressed the growth of Nitzschia sp., and (2) 5% HUS®-added polyethylene-coated steel wire suppressed the growth of Nitzschia sp. greater than 3% added one did.この研究は，トワロン株式会社による寄付金「HUSによる藻の発生変化の研究」により行われたものである

Asynchronous Bilateral Body Bending Enables Fast Cheetah-like Rotary Galloping

The 11th International Symposium on Adaptive Motion of Animals and Machines. Kobe University, Japan. 2023-06-06/09. Adaptive Motion of Animals and Machines Organizing Committee.Poster Session P

Preconcentration Method of Antimony Using Modified Thiol Cotton Fiber for Isotopic Analyses of Antimony in Natural Samples

textabstractAutophagosomes, the hallmark of autophagy, are double-membrane vesicles sequestering cytoplasmic components. They are generated at the phagophore assembly site (PAS), the phagophore being the precursor structure of these carriers. According to the current model, autophagosomes result from the elongation and reorganization of membranes at the PAS/phagophore driven by the concerted action of the autophagy-related (Atg) proteins. Once an autophagosome is completed, the Atg proteins that were associated with the expanding phagophore are released in the cytoplasm and reused for the biogenesis of new vesicles. One molecular event required for autophagosome formation is the generation of phosphatidylinositol 3-phosphate (PtdIns3P) at the PAS. Our data indicate that in addition to the synthesis of this lipid, the dephosphorylation of PtdIns3P is also crucial for autophagy progression. In the absence of Ymr1, a specific PtdIns3P phosphatase and the only yeast member of the myotubularin protein family, Atg proteins remain associated with complete autophagosomes, which are thus unable to fuse with the vacuole

Reports of Studies supported by Grant-in-Aid for Research from the Graduate School of Biosphere Science, Hiroshima University

（平成23年度） プロジェクト研究 Grant-in-Aid for Project Research ・リサイクル焼成カキ殻による環境改善効果の持続性に関する研究...山本民次, 佐々木晶子, キム・キョンヘ, 浅岡聡 （平成24年度） 国際共同研究 Grant-in-Aid for International Cooperative Research ・生物生産学部の海外実習における学生と地域住民の交流意識に関する調査 : フィリピン大学ビサヤ校との交流協定締結をめざして...山尾政博 基盤研究サポート Grant-in-Aid for Fundamental Research ・高精度モニタリングを利用した赤潮分布予測手法の開発...小池一彦, 有元太朗, Maung Saw Htoo Tha

Detection of the thermal component in GRB 160107A

We present the detection of a blackbody component in gamma-ray burst GRB 160107A emission by using the combined spectral data of the CALET Gamma-ray Burst Monitor (CGBM) and the MAXI Gas Slit Camera (GSC). MAXI/GSC detected the emission ∼45 s prior to the main burst episode observed by the CGBM. The MAXI/GSC and the CGBM spectrum of this prior emission period is fitted well by a blackbody with temperature 1.0 +0.3-0.2 keV plus a power law with a photon index of -1.6 ± 0.3. We discuss the radius of the photospheric emission and the main burst emission based on the observational properties. We stress the importance of coordinated observations via various instruments collecting high-quality data over a broad energy coverage in order to understand the GRB prompt emission mechanism

Radiation dose during relativistic electron precipitation events at the International Space Station

AbstractWe provide a quantitative estimate of the radiation dose during relativistic electron precipitation (REP) events at the International Space Station (ISS). To this goal, we take advantage of the data collected by the CALorimetric Electron Telescope, the Monitor of All‐sky X‐ray Image, and the Space Environment Data Acquisition equipment‐Attached Payload. The three ISS detectors offer complementary REP observations, including energy spectra and flux directional information, during a period of approximately 2.5 years, from November 2015 to March 2018. We have identified 762 REP events during this period from which we obtain the distribution of radiation dose, relevant to extravehicular activities outside the ISS