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140 results on '"Yano, Tatsuya"'

2. A Golod complex with non-suspension moment-angle complex

Author

Iriye, Kouyemon and Yano, Tatsuya

Subjects
Mathematics - Algebraic Topology, Mathematics - Commutative Algebra, Mathematics - Combinatorics, 55P15, 13F55
Abstract

It could be expected that the moment-angle complex associated with a Golod simplicial complex is homotopy equivalent to a suspension space. In this paper, we provide a counter example to this expectation. We have discovered this complex through the studies of the Golod property of the Alexander dual of a join of simplicial complexes, and that of a union of simplicial complexes., Comment: 22 pages

Published
2016

4. Biodegradable Cuboid Isotropic Metamaterial for Wireless Soil Monitoring

Author

Yano, Tatsuya, Tanihara, Wataru, Sato, Soma, Furusawa, Gaku, Onoe, Hiroaki, and Kan, Tetsuo

Abstract

Advanced sensing technologies such as remote sensing and sensor networks, important for enhancing land use through soil condition monitoring, are facing issues including high machine learning costs, limited measurement point density, and environmental impact. This study introduces a remote sensing method that offers both direct and wide-area sensing of soil properties using a dispersible, biodegradable cuboid-shaped isotropic metamaterial equipped with a water-soluble Mg-based resonance antenna structure. The symmetrical metal patterns ensure isotropic reflectance within the 1.2–3.6-GHz range, enabling robust sensing even when the metamaterial is dispersed randomly on the soil. The degradation of the Mg antenna in the soil presents a significant reflection reduction from 80% to 20% at a 2.4-GHz resonant frequency on the soil, promoting the feasibility of combination with a simple wireless measurement system. Integration with functional coatings that dissolve in response to specific soil substances such as pH-sensitive hydroxyapatite leads to the development of biodegradable soil remote monitoring sensors, offering precise, sustainable land management.

Published
2024
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6. Reversal of Hyperglycemia by Subcutaneous Islet Engraftment Using an Atelocollagen Sponge as a Scaffold.

Author

Wu, Yumeng, Yano, Tatsuya, Enomoto, Takayuki, Endo, Atena, Okada, Seiji, Araki, Kimi, Shiraki, Nobuaki, and Kume, Shoen

Subjects
TYPE 1 diabetes, GLUCOSE intolerance, BLOOD sugar, PORTAL vein, INSULIN therapy
Abstract

Type 1 diabetes mellitus (T1DM) affects 8.4 million people worldwide, with patients primarily relying on exogenous insulin injections to maintain blood glucose levels. Islet transplantation via the portal vein has allowed for the direct internal release of insulin by glucose-sensitive islets. However, this method might not be desirable for future cell therapy transplanting pluripotent stem cell-derived β cells, facing challenges including difficulties in cell retrieval and graft loss due to the instant blood-mediated inflammatory reaction (IBMIR). Here, we established a subcutaneous transplantation protocol using an atelocollagen sponge as a scaffold. While the subcutaneous site has many advantages, the lack of a vascular bed limits its application. To address this issue, we performed angiogenesis stimulation at the transplantation site using bFGF absorbed in a gelatin sponge (Spongel), significantly improving the microvascular area. Our in vivo experiments also revealed angiogenesis stimulation is crucial for reversing hyperglycemia in streptozotocin (STZ)-induced diabetic mice. In addition to the angiogenic treatment, an atelocollagen sponge is used to carry the islets and helps avoid graft leakage. With 800 mouse islets delivered by the atelocollagen sponge, the STZ-induced diabetic mice showed a reversal of hyperglycemia and normalized glucose intolerance. Their normoglycemia was maintained until the graft was removed. Analysis of the harvested islet grafts exhibited a high vascularization and preserved morphologies, suggesting that using an atelocollagen sponge as a scaffold helps maintain the viability of the islet grafts. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Acute internal carotid artery occlusion due to dissection of the paraclinoid segment: Diagnostic usefulness of angiographic findings during stent retriever deployment

Author

Sasaki, Isao, primary, Imahori, Taichiro, additional, Yano, Tatsuya, additional, Onobuchi, Kana, additional, Gomi, Masanori, additional, Kuroda, Junko, additional, Kobayashi, Norikata, additional, Sato, Kimitoshi, additional, Niwa, Yoji, additional, Iwasaki, Koichi, additional, and Hasegawa, Hiroshi, additional

Published
2023
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19. Determination of styrene copolymer sizing agents in paper by pyrolysis gas chromatography

Author

Ishida, Yasuyuki, Ohtani, Hajime, Tsuge, Shin, and Yano, Tatsuya

Subjects
Styrene -- Analysis, Polymers -- Analysis, Gas chromatography -- Methods, Chromatographic analysis -- Methods, Chemistry
Abstract

Styrene copolymer sizing agents in paper are determined by pyrolysis gas chromatography. Styrene monomer derived from the styrene sequences in the copolymer is used as the key product in the pyrograms of paper samples. The amounts of the sizing agents retained in paper samples are determined with a precision of about 1.4% relative standard deviation. The results obtained suggest that about 80% of the sizing agents added in the pulp slurry are retained in the paper samples studied. Furthermore, the amounts of the sizing agents in paper are interpreted in terms of the degree of sizing.

Published
1994

23. Measurement of Seagrass Beds in Obama Bay Using Satellite Remote Sensing

Author

Aoyama, Takashi, Yano, Tatsuya, and Yagi, Ippei

Subjects
Multi-spectral Camera, Satellite Image, Seagrass Beds, Obama Bay
Abstract

The purpose of our research is to develop a procedure for extracting information on seagrass beds from multi-spectral satellite images with high spatial resolution. As the first step of this research, a field observation of seagrass beds in Obama Bay as a test site has been conducted using multi-spectral camera (ADC3). The observation results show that the NDVI obtained from multi-spectral camera is a good index to extract seagrass that lives in shallow sea. Based on this result, the procedures to obtain information on the density of seagrass and the area of seagrass beds using NDVI images obtained from high resolution satellite sensors were proposed. In addition, it was confirmed that the area of seagrass beds in the last decade clearly decreased.

Published
2014

27. Discovery of DS-1558: A Potent and Orally Bioavailable GPR40 Agonist

Author

Takano, Rieko, primary, Yoshida, Masao, additional, Inoue, Masahiro, additional, Honda, Takeshi, additional, Nakashima, Ryutaro, additional, Matsumoto, Koji, additional, Yano, Tatsuya, additional, Ogata, Tsuneaki, additional, Watanabe, Nobuaki, additional, Hirouchi, Masakazu, additional, Yoneyama, Tomoko, additional, Ito, Shuichiro, additional, and Toda, Narihiro, additional

Published
2015
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