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Chao Zhang, Ovidiu Cretu, Dmitry G Kvashnin, Naoyuki Kawamoto, Masanori Mitome, Xi Wang, Yoshio Bando, Pavel B Sorokin, Dmitri Golberg
We demonstrate that high resolution transmission electron microscopy (HRTEM) paired with light illumination of a sample and its electrical probing can be utilized for the in situ study of initiated photocurrents in free-standing nanowires. Morphology, phase and crystallographic information from numerous individual CdS nanowires is obtained simultaneously with photocurrent measurements. Our results indicate that elastically bent CdS nanowires possessing a wurtzite structure show statistically unchanged values of ON/OFF (photocurrent/dark current) ratios...
October 12, 2016: Nano Letters
Toshihiro Kogure, Noriko Yamaguchi, Hiroyo Segawa, Hiroki Mukai, Satoko Motai, Kotone Akiyama-Hasegawa, Masanori Mitome, Toru Hara, Tsuyoshi Yaita
Microparticles of radioactive cesium (Cs)-bearing silicate glass emitted from the Fukushima Daiichi nuclear power plant were investigated mainly using state-of-the-art energy-dispersive X-ray spectroscopy in scanning transmission electron microscopes. Precise elemental maps of the particles were obtained using double silicon drift detectors with a large collection angle of X-rays, and qualitative elemental analysis was performed using high-resolution X-ray spectroscopy with a microcalorimetry detector. Beside the substantial elements (O, Si, Cl, K, Fe, Zn, Rb, Sn and Cs) as previously reported, Mn and Ba were also common, though their amounts were small...
October 2016: Microscopy
Hiroumi Mitome, Tomoya Ishizuka, Hiroaki Kotani, Yoshihito Shiota, Kazunari Yoshizawa, Takahiko Kojima
A ruthenium(II) complex, [Ru(dmdmp)Cl(MeBPA)] (2) (Hdmdmp = N,N-dimethyl-6,7-dimethylpterin, MeBPA = N-methyl-N,N-bis(pyridylmethyl)amine), having a pterin derivative as a proton-accepting ligand, was synthesized and characterized. Complex 2 shows higher basicity than that of a previously reported Ru(II)-pterin complex, [Ru(dmdmp) (TPA)](+) (1) (TPA = tris(2-pyridylmethyl)amine). On the other hand, 1e(-)-oxidized species of 1 (1OX) exhibits higher electron-acceptability than that of 1e(-)-oxidized 2 (2OX). Bond dissociation enthalpies (BDE) of the two Ru(II) complexes having Hdmdmp as a ligand in proton-coupled electron transfer (PCET) to generate 1OX and 2OX were calculated to be 85 kcal mol(-1) for 1OX and 78 kcal mol(-1) for 2OX...
August 3, 2016: Journal of the American Chemical Society
Koichiro Ota, Yukiko Hamamoto, Wakiko Eda, Kenta Tamura, Akiyoshi Sawada, Ayako Hoshino, Hidemichi Mitome, Kazuo Kamaike, Hiroaki Miyaoka
Two new nitrogenous prenylbisabolanes never before found in Lithistid sponges have been isolated from Theonella swinhoei. These new diterpenes, named amitorine A (1) and amitorine B (2), containing a prenylbisabolane skeleton have been characterized by spectroscopic analyses, and the relative and absolute configurations of 1 and 2 were determined by asymmetric synthesis of both diastereomers via the common bicyclic lactone 6 intermediate.
April 22, 2016: Journal of Natural Products
Noriko Yamaguchi, Masanori Mitome, Akiyama-Hasegawa Kotone, Maki Asano, Kouji Adachi, Toshihiro Kogure
Microparticles containing substantial amounts of radiocesium collected from the ground in Fukushima were investigated mainly by transmission electron microscopy (TEM) and X-ray microanalysis with scanning TEM (STEM). Particles of around 2 μm in diameter are basically silicate glass containing Fe and Zn as transition metals, Cs, Rb and K as alkali ions, and Sn as substantial elements. These elements are homogeneously distributed in the glass except Cs which has a concentration gradient, increasing from center to surface...
2016: Scientific Reports
Taku Mitome, Kazuhiro Furuya, Masashi Imano, Kimito Osaka, Yumiko Yokomizo, Narihiko Hayashi, Noboru Nakaigawa, Shoji Yamanaka, Masahiro Yao
Renal lymphoma as an initial lesion is relatively rare. Bilateral renal lymphoma frequently presents as acute kidney injury. With systematic chemotherapy for the lymphoma, patients usually recover their kidney function. However, in the case we describe here, the patient's kidney function recovered greatly after an open renal biopsy. Here, we review and discuss this unique case.
January 2016: Clinical Case Reports
Pengcheng Dai, Yanming Xue, Xuebin Wang, Qunhong Weng, Chao Zhang, Xiangfen Jiang, Daiming Tang, Xi Wang, Naoyuki Kawamoto, Yusuke Ide, Masanori Mitome, Dmitri Golberg, Yoshio Bando
How to concentrate target molecules on the surface of a SERS substrate is a key problem in the practical application of SERS. Herein, we designed for the first time a pollutant capturing surface enhanced Raman spectroscopy (SERS) substrate, namely porous BN microfibers uniformly decorated with Ag nanoparticles, in which the BN microfibers adsorb pollutants, while the Ag nanoparticles provide SERS activity. This SERS substrate captures pollutants from an aqueous solution completely and accumulates them all on its surface without introducing noise signals...
December 7, 2015: Nanoscale
Naoyuki Kawamoto, Yohei Kakefuda, Takao Mori, Kenji Hirose, Masanori Mitome, Yoshio Bando, Dmitri Golberg
We developed an original method of in situ nanoscale characterization of thermal resistance utilizing a high-resolution transmission electron microscope (HRTEM). The focused electron beam of the HRTEM was used as a contact-free heat source and a piezo-movable nanothermocouple was developed as a thermal detector. This method has a high flexibility of supplying thermal-flux directions for nano/microscale thermal conductivity analysis, and is a powerful way to probe the thermal properties of complex or composite materials...
November 20, 2015: Nanotechnology
Dai-Ming Tang, Cui-Lan Ren, Ruitao Lv, Wan-Jing Yu, Peng-Xiang Hou, Ming-Sheng Wang, Xianlong Wei, Zhi Xu, Naoyuki Kawamoto, Yoshio Bando, Masanori Mitome, Chang Liu, Hui-Ming Cheng, Dmitri Golberg
The hollow core of a carbon nanotube (CNT) provides a unique opportunity to explore the physics, chemistry, biology, and metallurgy of different materials confined in such nanospace. Here, we investigate the nonequilibrium metallurgical processes taking place inside CNTs by in situ transmission electron microscopy using CNTs as nanoscale resistively heated crucibles having encapsulated metal nanowires/crystals in their channels. Because of nanometer size of the system and intimate contact between the CNTs and confined metals, an efficient heat transfer and high cooling rates (∼10(13) K/s) were achieved as a result of a flash bias pulse followed by system natural quenching, leading to the formation of disordered amorphous-like structures in iron, cobalt, and gold...
August 12, 2015: Nano Letters
S M Falzarano, M Ferro, E Bollito, E A Klein, G Carrieri, C Magi-Galluzzi
The aim of this review is to critically analyze the current state of research in selected biomarkers and genomic-based tests for prostate cancer (PCa) diagnosis, staging, prognostication, and monitoring. Although in Western societies, PCa is the most common solid malignancy and the second leading cause of cancer death in men, the vast majority of men with PCa are diagnosed with clinically localized disease. The widespread use of prostate-specific antigen (PSA) testing, on one hand, has resulted in earlier PCa detection at a potentially more curable stage, but on the other hand has led to an increase in the rate of negative biopsies, as well as overdetection and overtreatment of potentially indolent tumors that would not have become life-threatening to a patient...
September 2015: Minerva Urologica e Nefrologica, the Italian Journal of Urology and Nephrology
Akimitsu Kobayashi, Izumi Yamamoto, Haruki Katsumata, Takafumi Yamakawa, Aki Mafune, Yasuyuki Nakada, Kentaro Koike, Jun Mitome, Jun Miki, Hiroki Yamada, Yudo Tanno, Ichiro Ohkido, Nobuo Tsuboi, Keitaro Yokoyama, Hiroyasu Yamamoto, Takashi Yokoo
BACKGROUND: Both immunological and non-immunological etiologies affect graft function after kidney transplantation, including acute rejection, calcineurin inhibitor toxicity, and a recurrence of glomerulonephritis. Glomerular enlargement or glomerular sclerosis due to glomerular hyperfiltration related to increased renal blood flow is another cause. Although the glomerular volume in baseline biopsies predicts late allograft function, the relationship between allograft function and the annual changes in glomerular volume after kidney transplantation are unclear...
July 2015: Nephrology
Yumiko Mitome-Mishima, Hidenori Oishi, Munetaka Yamamoto, Kenji Yatomi, Senshu Nonaka, Nobukazu Miyamoto, Takao Urabe, Hajime Arai
BACKGROUND AND PURPOSE: Recanalization of post-embolization cerebral aneurysms remains a serious problem that influences treatment outcomes. Matrix2 is a bioactive, bio-absorbable, detachable coil that was developed to reduce the risk of recanalization. We examined the short-term efficacy of the Matrix2 coil system, and evaluated the temporal profile of tissue proliferation in a swine experimental aneurysm model compared with the bare platinum (BP) coil. MATERIALS AND METHODS: Thirty-six experimental aneurysms were created in 18 swine...
February 2016: Journal of Neuroradiology. Journal de Neuroradiologie
Taku Mitome, Masahiro Yao, Naoko Udaka, Shusei Fusayasu, Koji Izumi, Kimito Osaka, Narihiko Hayashi, Noboru Nakaigawa, Yoji Nagashima, Yoshinobu Kubota
A 45-year-old man complained of a palpable mass in his left abdomen. Computed tomography showed a horseshoe kidney with a Bosniak type II complicated cyst from a left segment. Three years after his initial examination, due to the growing cystic lesion and the compression imposed on the urinary collecting system and surrounding organs, we performed a left heminephrectomy. The diagnosis was mucinous cystadenoma of the kidney. No recurrence was observed 6 months after surgery. The histopathology was unique since the inner surface of the cyst was covered by a mucin-positive columnar epithelium connected to a urothelium, with continuous transition between the two...
January 2015: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
Y Yatomi, R Tanaka, Y Shimada, K Yamashiro, M Liu, Y Mitome-Mishima, N Miyamoto, Y Ueno, T Urabe, N Hattori
Diabetes mellitus (DM) is a major risk factor for stroke and it exacerbates tissue damage after ischemic insult. Diabetes is one of the important causes of the progression of white matter lesion, however, the pathological mechanisms remain unclear. The present study evaluated the influences of type 2 DM on ischemic subcortical white matter injury and the recruitment of oligodendrocyte progenitor cells (OPCs) under chronic cerebral hypoperfusion using type 2 diabetic (db/db) mice. After bilateral common carotid artery stenosis (BCAS), the rarefaction in the white matter was more severe in db/db mice than in db/+ mice, and the number of glutathione S-transferase-pi (GST-pi)-positive mature oligodendrocytes (OLG) was lower in db/db mice than in db/+ mice at 4 and 8 weeks after ischemia...
March 19, 2015: Neuroscience
Hiroumi Mitome, Tomoya Ishizuka, Yoshihito Shiota, Kazunari Yoshizawa, Takahiko Kojima
Ruthenium(ii) complexes of PQQTME, a trimethyl ester derivative of redox-active PQQ (pyrroloquinolinequinone), were prepared using a tridentate ligand, 2,2':6',2''-terpyridine (terpy) as an auxiliary ligand. The characterization of the complexes was performed by spectroscopic methods, X-ray crystallography, and electrochemical measurements. In one complex, the pyridine site of PQQTME binds to the [Ru(II)(terpy)] unit as a tridentate ligand, and a silver(i) ion is coordinated by the quinone moiety in a bidentate fashion...
February 21, 2015: Dalton Transactions: An International Journal of Inorganic Chemistry
Shigemi Kohiki, Koichiro Nara, Masanori Mitome, Daiju Tsuya
An oleic acid-coated Fe2.7Co0.3O4 nanocrystal (NC) self-assembled film was fabricated via drop casting of colloidal particles onto a three-terminal electrode/MgO substrate. The film exhibited a large coercivity (1620 Oe) and bifurcation of the zero-field-cooled and field-cooled magnetizations at 300 K. At 10 K, the film exhibited both a Coulomb blockade due to single electron charging as well as a magnetoresistance of ∼-80% due to spin-dependent electron tunneling. At 300 K, the film also showed a magnetoresistance of ∼-80% due to hopping of spin-polarized electrons...
October 22, 2014: ACS Applied Materials & Interfaces
Hidemichi Mitome, Erika Sugiyama, Hitoshi Sato, Kazuki Akira
(13)C-Labeled lidocaine, 2-di[1-(13)C]ethylamino-N-(2,6-dimethylphenyl)acetamide (1), was synthesized from [1-(13)C]acetic acid in six steps, as a probe for a breath test to evaluate in vivo cytochrome P450 activity. The measurement of (13)CO2 in breath was successfully performed following oral administration of (13)C-lidocaine 1 to mice.
2014: Chemical & Pharmaceutical Bulletin
Yumiko Mitome-Mishima, Nobukazu Miyamoto, Ryota Tanaka, Tatsuo Shimosawa, Hidenori Oishi, Hajime Arai, Nobutaka Hattori, Takao Urabe
Adrenomedullin was originally isolated from pheochromocytoma cells and reduces insulin resistance by decreasing oxidative stress. White matter lesions induced by aging and hyperglycemia play a crucial role in cognitive impairment in poststroke patients. Here, we examine whether adrenomedullin deficiency and aging exacerbate ischemic white matter injury after prolonged cerebral hypoperfusion. Adrenomedullin heterozygous, wild-type young/aged mice were subjected to prolonged hypoperfusion. Prolonged cerebral hypoperfusion followed by immunohistochemical analysis was used to evaluate white matter injury...
2014: BioMed Research International
Yumiko Mitome-Mishima, Munetaka Yamamoto, Kenji Yatomi, Senshu Nonaka, Nobukazu Miyamoto, Takao Urabe, Hajime Arai, Hidenori Oishi
After coil embolization, recanalization in cerebral aneurysms adversely influences long-term prognosis. Proliferation of endothelial cells on the coil surface may reduce the incidence of recanalization and further improve outcomes after coil embolization. We aimed to map the expression of proliferating tissue over the aneurysmal orifice and define the temporal profile of tissue growth in a swine experimental aneurysm model. We compared the outcomes after spontaneous thrombosis with those of coil embolization using histological and morphological techniques...
2014: PloS One
Naoki Sugano, Keitaro Yokoyama, Naohiko Kato, Yoichiro Hara, Satoshi Endo, Jun Mitome, Taisei Kin, Goro Tokudome, Satoru Kuriyama, Tatsuo Hosoya, Takashi Yokoo
BACKGROUND: Bioelectrical impedance analysis (BIA) is a non-invasive method to estimate total body water (TBW) and extracellular water (ECW) volume. Crit-Line(®) (CL), on the other hand, assesses intravascular water (IVW) volume. We evaluate continuous changes in body water composition during hemodialysis (HD) with concurrent use of BIA and CL. METHODS: BIA at the start and the end of the HD session was measured using a BIA device. To investigate the shifting pattern of body water composition, patients were subjected to simultaneous monitoring of BIA with CL...
December 2014: Clinical and Experimental Nephrology
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