Kazu Suenaga, Haruka Kobayashi, Masanori Koshino,
Electron energy-loss spectroscopy (EELS) is used to analyze single-layered hexagonal boron-nitride with or without point defects. EELS profiles using a 0.1 nm probe clearly discriminate the chemical species of single atoms but show different delocalization of the boron and nitrogen K edges. A monovacancy at the boron site is unambiguously identified and the electronic state of its nearest neighboring nitrogen atoms is examined by energy-loss near edge fine structure analysis, which demonstrates a ...
Tópico(s): Boron and Carbon Nanomaterials Research
2012 - American Physical Society | Physical Review Letters
Kazu Suenaga, Haruka Kobayashi, Masanori Koshino,
Tópico(s): Advanced Materials Characterization Techniques
2012 - Springer Nature | MRS Bulletin
Haruka Yamane, Shozo Tomonaga, Rie Suenaga, D. Michael Denbow, Mitsuhiro Furuse,
Glutathione-related enzymes glyoxalase 1 and glutathione reductase 1 regulates anxiety in mice. To clarify the central function of glutathione as a neurotransmitter in the stress reaction, the effect of intracerebroventricular (i.c.v.) injection of reduced (GSH) (0.5, 1, 2 μmol) and oxidized (GSSG) glutathione (0.25, 0.5, 1 μmol) were investigated under an isolation-induced stress in the neonatal chick. Both GSH and GSSG dose-dependently decreased distress vocalizations and induced sleep-like behavior ...
Tópico(s): Biochemical effects in animals
2007 - Elsevier BV | Neuroscience Letters
Hong En Lim, Yasumitsu Miyata, Miho Fujihara, Susumu Okada, Zheng Liu, Arifin Arifin, Kayoko Sato, Haruka Omachi, Ryo Kitaura, Stephan Irle, Kazu Suenaga, Hisanori Shinohara,
Nanotemplated growth of graphene nanoribbons (GNRs) inside carbon nanotubes is a promising mean to fabricate ultrathin ribbons with desired side edge configuration. We report the optical properties of the GNRs formed in single-wall carbon nanotubes. When coronene is used as the precursor, extended GNRs are grown via a high-temperature annealing at 700 °C. Their optical responses are probed through the diazonium-based side-wall functionalization, which effectively suppresses the excitonic absorption ...
Tópico(s): Molecular Junctions and Nanostructures
2015 - American Chemical Society | ACS Nano
Dumitru Dumcenco, Haruka Kobayashi, Zheng Liu, Ying‐Sheng Huang, Kazu Suenaga,
The alloying behaviour of materials is a well-known problem in all kinds of compounds. Revealing the heteroatomic distributions in two-dimensional crystals is particularly critical for their practical use as nano-devices. Here we obtain statistics of the homo- and heteroatomic coordinates in single-layered Mo(1-x)W(x)S(2) from the atomically resolved scanning transmission electron microscope images and successfully quantify the degree of alloying for the transition metal elements (Mo or W). The results ...
Tópico(s): Machine Learning in Materials Science
2013 - Nature Portfolio | Nature Communications
Kaori Ozaki, Arihiro Iwasaki, Dai Sezawa, Haruka Fujimura, Tomoyoshi Nozaki, Yumiko Saito‐Nakano, Kiyotake Suenaga, Toshiaki Teruya,
The bioassay-guided fractionation of an Okeania sp. marine cyanobacterium collected in Okinawa led to the isolation of the lipopeptide mabuniamide (1). The gross structure of 1 was determined by spectroscopic analyses, and its absolute configuration was determined using Marfey's analysis of the acid hydrolysate of 1. The absolute configuration of 1 was confirmed by total synthesis. Mabuniamide (1) stimulated glucose uptake in cultured rat L6 myotubes. In addition, mabuniamide (1) and its stereoisomer ( ...
Tópico(s): Synthetic Organic Chemistry Methods
2019 - American Chemical Society | Journal of Natural Products
Haruka Yamane, Rie Suenaga, Li Han, Kohsuke Hayamizu, D. Michael Denbow, Mitsuhiro Furuse,
To identify the important structural components of glutathione that induce sedative and hypnotic effects, intracerebroventricular (i.c.v.) injection of three glutathione-related dipeptides, i.e., glutamyl-cysteine (Glu-Cys), cysteinyl-glycine (Cys-Gly) and glutamyl-glycine (Glu-Gly) were given during an acute stress condition in neonatal chicks. These peptides attenuated distress vocalizations and spontaneous activity induced by social isolation. The increase in the time for sedation including sleep ...
Tópico(s): Neuroscience of respiration and sleep
2007 - Bentham Science Publishers | Letters in Drug Design & Discovery
Hisae SUENAGA, Haruka Minato, Daisuke Suzuki, Yoshitake Akiyama,
Three-dimensionally printed objects with photo-curable resin generally have high toxicity to cells, making it difficult to apply them to living systems. This paper reports a technique to construct a three-dimensional object in a glass chamber by aggregating microgels, which are polymers of N-isopropylacrylamide (NiPAm) and glycidyl methacrylate (GMA). We aggregated the microgels whose have a higher biocompatibility than the photo-curable resin by relatively diamagnetic assembly. Microgels were positively ...
Tópico(s): Advanced Materials and Mechanics
2018 - Japan Society Mechanical Engineers | The Proceedings of Mechanical Engineering Congress Japan
Hisae SUENAGA, Haruka Minato, Daisuke Suzuki, Yoshitake Akiyama,
A biocompatible soft micromachine is desirable to manipulate small biological objects like cells. This paper evaluated thermal responses of thermal responsive microgel aggregate to utilize as an actuator. The microgel aggregate was fabricated by gathering both microgels charged positively and negatively based on relative diamagnetic assembly. The aggregate shrank when it was heated up to 40 °C and expanded when it was returned to room temperature. The area shrinkage ratio between 25 to 40 °C was about ...
Tópico(s): Micro and Nano Robotics
2019 - Japan Society Mechanical Engineers | The Proceedings of JSME annual Conference on Robotics and Mechatronics (Robomec)
Yoshitake Akiyama, Toru Kano, Hisae SUENAGA, Haruka Minato, Daisuke Suzuki,
Tópico(s): Modular Robots and Swarm Intelligence
2019 - Japan Society Mechanical Engineers | The Proceedings of Mechanical Engineering Congress Japan
Arihiro Iwasaki, Haruka Fujimura, Shinichiro Okamoto, Takafumi Kudo, Shizuka Hoshina, Shimpei Sumimoto, Toshiaki Teruya, Kiyotake Suenaga,
Two new jahanyne analogues, jahanene and jahanane, highly N-methylated lipopeptides, were isolated from a marine cyanobacterium Okeania sp., and their structures were determined by NMR and MS. In addition, we achieved total syntheses of the jahanyne family and assessed their activities. The resulting growth-inhibitory activity of jahanyne was nearly one-tenth of the previously reported activity. Furthermore, we found that the degree of unsaturation at the terminus of the fatty acid moiety affected ...
Tópico(s): Algal biology and biofuel production
2018 - American Chemical Society | The Journal of Organic Chemistry
Takanori Kumekawa, Masahiko Hasebe, Haruka SUENAGA,
Spring runoff is mostly comprised snowmelt and is very important on water resource as public water and etc. And Many studies have been conducted on forecasting and estimation of snowmelt volume.In this paper, firstly, characteristic ofsnowmelt runoff is investigated using spectral analysis. Next, Snowmelt water is estimated by Heat budget method that takes in planting cover information in the Yuda basin. And it is investigated that plant cover distribution have influence on snowmelt water. It is ...
Tópico(s): Cryospheric studies and observations
1997 - | PROCEEDINGS OF HYDRAULIC ENGINEERING
Haruka SUENAGA, Yuka Kosugi, Morihiro Takano, Ryo Honda, Ryoko Yamamoto,
日本海側の中規模海跡湖である河北潟の有機物の起源を推定するために，流域の水質調査を行った．その結果，夏季における有機物濃度の上昇の多くが溶存態有機物(DOM)の増加によるものであり，これは流入河川のDOMの増加に起因すると推定された．また，流入河川のDOMの増加は中流部でも同様に認められたことから，DOMの起源は河川上流部であることが示された．次に，流入する代表河川のDOMの動態をEEM-PARAFAC解析を用いて解析した結果，河川上流部からDOMの増加が認められ，上流部に点在するため池および水田からの流出が起源と推定された．
Tópico(s): Earthquake and Disaster Impact Studies
2017 - | Journal of Japan Society of Civil Engineers Ser G (Environmental Research)
Kazu Suenaga, Kotone Akiyama‐Hasegawa, Yasuhiro Niimi, H. Kobayashi, Maki Nakamura, Jefferson Zhe Liu, Yuta Sato, Masanori Koshino, Sumio Iijima,
... dimensional materials with interrupted periodicities Get access Kazu Suenaga, Kazu Suenaga * 1Nanotube Research Center, National Institute of Advanced Industrial ... To whom correspondence should be addressed. E-mail: suenaga-kazu@aist.go.jp Search for other works ... this author on: Oxford Academic PubMed Google Scholar Haruka Kobayashi, Haruka Kobayashi 1Nanotube Research Center, National Institute of Advanced ...
Tópico(s): Diamond and Carbon-based Materials Research
2012 - Oxford University Press | Journal of Electron Microscopy
Yuta Miyamoto, Arihiro Iwasaki, Haruka Fujimura, Chihiro Kudo, Naoaki Kurisawa, Osamu Ohno, Kiyotake Suenaga,
Caldorazole (1) is a novel polyketide that was isolated from a marine cyanobacterium in 2022. It is a unique natural product that exhibits potent inhibitory activity against mitochondrial respiratory chain complex I despite having no chiral centers. To establish a method for obtaining caldorazole without relying on biological resources and for constructing a useful synthetic route for studies of its structure–activity relationship, we achieved the first total synthesis of caldorazole using a convergent ...
Tópico(s): Chemical Synthesis and Analysis
2023 - American Chemical Society | The Journal of Organic Chemistry
Haruka FUJII, Makiko KIDO-NAKAHARA, Seisho Sato, Asako SUENAGA, Kiichiro Nishio, Ayaka ETO, M. Yoshida, Gaku TSUJI, Takeshi Nakahara, Hiromaro KIRYU, Ryo SASAKI, Masutaka Furue,
患者：37 歳，男性
Tópico(s): Testicular diseases and treatments
2021 - Kyushu University | The Nishinihon Journal of Dermatology