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ポリワーズ 幾何拘束触媒

Toshio Sasaki, Hirofumi Johoji
1993 Kobunshi  
doi:10.1295/kobunshi.42.932a fatcat:xe2rhibo4zb57gq6vo2aswftfu

Biliary stenting

Hiroyuki Isayama, Yousuke Nakai, Osamu Togawa, Hirofumi Kogure, Takashi Sasaki, Masao Omata
2009 Tando  
胆 道 23 巻 1 号(2009) 56:56 Biliary stenting Hiroyuki Isayama, Yousuke Nakai, Osamu Togawa, Hirofumi Kogure, Takashi Sasaki, Masao Omata The requirements of biliary stenting for unresectable biliary malignancies  ... 
doi:10.11210/tando.23.45 fatcat:mrs7mobaqram5g5v2udsjeijsq

RU 28965の臨床的検討

1988 Chemotherapy  
doi:10.11250/chemotherapy1953.36.supplement4_386 fatcat:bfbh7gxqzvcmlpznxewato4nb4

Wear resistance of cast dental Ti-Fe alloys

Hirofumi YAMAGUCHI, Masatoshi TAKAHASHI, Keiichi SASAKI, Yukyo TAKADA
2020 Dental materials journal  
Binary Ti-Fe alloys with 5-25 mass% Fe were prepared, and subjected to reciprocating wear test. The aim of this study was to investigate the relationship between mechanical properties and the wear resistance of titanium and Ti-Fe alloys. The dimensions (length, width and depth) of wear marks on Ti-Fe alloys were less than those observed on pure Ti specimen. Wear resistance of Ti-Fe alloys was better than that of pure titanium. It was established that hardness was the main factor that influenced
more » ... wear resistance of Ti-Fe alloys. Single β Ti-Fe alloys showed better wear resistance than α+β Ti-Fe alloys. Increase in concentration of Fe in the β phase of Ti-Fe alloys leads to improved wear resistance of the alloy. Ti-Fe alloys with 11-15 mass% Fe form ideal candidates for fabrication of dental titanium alloys with excellent wear resistance.
doi:10.4012/dmj.2019-336 pmid:32848102 fatcat:7zbgw7hgsjadvbetsxc5gixzka

Physical Properties of 3-Butylsydnone

Yukio SASAKI, Tomonori KOSHIBA, Hirofumi TANIGUCHI, Yasuyuki TAKEYA
doi:10.1246/nikkashi.1992.140 fatcat:zik5e6kj4rhtxj6qglneltsami

Discovery of DNA viruses in wildlife in Zambia and Indonesia

Hirofumi SAWA, Michihito SASAKI, Yasuko ORBA
2017 Uirusu  
SAWA 1,2,*) , Michihito SASAKI 1) , Yasuko ORBA 1) 1) Division of Molecular Pathobiology, Research Center for Zoonosis Control, Hokkaido University 2) Global Institution for Collaborative Research  ...  FBAHV1 FBAHV1 3 4 FBAHV1 FBAHV1 42) 4 2010 10 5 FBAHV1 PCR PCR-positive bats Seropositive bats pp.151-160 2017 Discovery of DNA viruses in wildlife in Zambia and Indonesia Hirofumi  ... 
doi:10.2222/jsv.67.151 fatcat:oogtie4ibfg7tcnvj4kpvypvyq

Influence of Amino Acids on the Mobility of Iodide in Hydrocalumite

Mengmeng Wang, Hirofumi Akamatsu, Keiko Sasaki
2021 Minerals  
In the cement system, hydrocalumite is a candidate adsorbent for low-level 129I anionic species. However, the stability of hydrocalumite after immobilizing I− is unclear when they are exposed to pedosphere characterized by organic substances derived from living organisms. In the present work, five amino acids were selected as simplified models of natural organic substances under alkaline conditions. L-cysteine (H2Cys) and L-aspartic acid (H2Asp) accelerated the release of I− from
more » ... through ion-exchange. Ion-exchange of Cys2− with I− in I-hydrocalumite was faster than Asp2−, and the interlayer spacing (d003) of Cys-hydrocalumite was smaller than that of Asp-hydrocalumite. DFT simulations not only supported the above results but also predicted that there was a positive correlation between the formation energies and interlayer spacings of amino acids intercalated hydrocalumite, depending on the configurations. Moreover, in the DFT predictions, the interaction between amino acids and metallic hydroxide layers was responsible for the formation of hydrogen bonds and Ca-O chemical bonds between the -COO− groups and [Ca2Al(OH)6]+. The other three amino acids did not show intercalation through ion-exchange. The stability of I-hydrocalumite is influenced differently by coexisting amino acids, depending on the ionic sizes, charge numbers, and hydrophilicity, which cause the second contamination.
doi:10.3390/min11080836 fatcat:7jsnrmgcq5cpjijyblqybzp7uu

An Evaluation of Orbital Angular Momentum Multiplexing Technology

Doohwan Lee, Hirofumi Sasaki, Hiroyuki Fukumoto, Yasunori Yagi, Takashi Shimizu
2019 Applied Sciences  
This paper reports our investigation of wireless communication performance obtained using orbital angular momentum (OAM) multiplexing, from theoretical evaluation to experimental study. First, we show how we performed a basic theoretical study on wireless OAM multiplexing performance regarding modulation, demodulation, multiplexing, and demultiplexing. This provided a clear picture of the effects of mode attenuation and gave us insight into the potential and limitations of OAM wireless
more » ... tions. Then, we expanded our study to experimental evaluation of a dielectric lens and end-to-end wireless transmission on 28 gigahertz frequency bands. To overcome the beam divergence of OAM multiplexing, we propose a combination of multi-input multi-output (MIMO) and OAM technology, named OAM-MIMO multiplexing. We achieved 45 Gbps (gigabits per second) throughput using OAM multiplexing with five OAM modes. We also experimentally demonstrated the effectiveness of the proposed OAM-MIMO multiplexing using a total of 11 OAM modes. Experimental OAM-MIMO multiplexing results reached a new milestone for point-to-point transmission rates when 100 Gbps was achieved at a 10-m transmission distance.
doi:10.3390/app9091729 fatcat:khyzirlbxza4veo2rwo2bypsca

Reduced residual conduction gaps and favourable outcome in contact force-guided circumferential pulmonary vein isolation

Taihei Itoh, Masaomi Kimura, Hirofumi Tomita, Shingo Sasaki, Shingen Owada, Daisuke Horiuchi, Kenichi Sasaki, Yuji Ishida, Takahiko Kinjo, Ken Okumura
2015 Europace  
Aims Although contact force (CF)-guided circumferential pulmonary vein isolation (CPVI) for paroxysmal atrial fibrillation (PAF) is useful, AF recurrence at long-term follow-up still remains to be resolved. The purpose of this study was to assess safety and efficacy of CF-guided CPVI and to compare residual conduction gaps during CPVI and long-term outcome between the conventional (non-CF-guided) and the CF-guided CPVI. Methods and results We studied the 50 consecutive PAF patients undergoing
more » ... VI by a ThermoCool EZ Steer catheter (conventional group, mean age 61 + 10 years) and the other 50 consecutive PAF patients by a ThermoCool SmartTouch catheter (CF group, 65 + 11 years). The procedure parameters and residual conduction gaps during CPVI, and long-term outcome for 12 months were compared between the two groups. Circumferential pulmonary vein isolation was successfully accomplished without any major complications in both groups. Total procedure and total fluoroscopy times were both significantly shorter in the CF group than in the conventional group (160 + 30 vs. 245 + 61 min, P , 0.001, and 17 + 8 vs. 54 + 27 min, P , 0.001, respectively). Total number of residual conduction gaps was significantly less in the CF group than in the conventional group (2.7 + 1.7 vs. 6.3 + 2.7, P , 0.05). The AF recurrence-free rates after CPVI during 12-month follow-up were 96% (48/50) in the CF group and 82% (41/50) in the conventional group (P ¼ 0.02 by log rank test). Multivariate Cox regression analysis further supported this finding. Conclusion Contact force-guided CPVI is safe and more effective in reducing not only the procedure time but also the AF recurrence than the conventional CPVI, possibly due to reduced residual conduction gaps during CPVI procedure. ---
doi:10.1093/europace/euv206 pmid:26346921 pmcid:PMC4865059 fatcat:o4kt4om4fjdcjhc2kslu34jpma

Mechanical properties and microstructures of cast dental Ti-Fe alloys

Hirofumi YAMAGUCHI, Masatoshi TAKAHASHI, Keiichi SASAKI, Yukyo TAKADA
2020 Dental materials journal  
Binary Ti-Fe alloys of varying concentrations of Fe between 5-25% were made, and their castings evaluated in terms of microstructures formed and mechanical properties. The aim of this study was to explore the composition of Ti-Fe alloys that offers improved wear resistance of titanium. X-ray diffraction and microstructural observation revealed that 5-7% Fe, 8-15% Fe, and 20-25% Fe consisted of α+β, single β, and β+TiFe phases, respectively. The hardness of alloys with 8-13% Fe was almost equal
more » ... o that of Co-Cr alloys but lower than of the other Ti-Fe alloys. Elongation of the Ti-Fe alloys was negligible. However, dimples were observed in specimen containing 7-11% Fe. Alloys with 9% Fe demonstrated the highest strength of more than 850 MPa. We believe that Ti-Fe alloys with 8-11% Fe may be applicable in development of an alloy with good wear resistance due to the exhibited properties of high hardness and ductility albeit low.
doi:10.4012/dmj.2019-254 pmid:32848101 fatcat:pmxnnidhdrfztokai47cpxctvu

Primary cellulitis and cutaneous abscess caused by Yersinia enterocolitica in an immunocompetent host

Hirofumi Kato, Shugo Sasaki, Noritaka Sekiya
2016 Medicine  
Primary extraintestinal complications caused by Yersinia enterocolitica are extremely rare, especially in the form of skin and soft-tissue manifestations, and little is known about their clinical characteristics and treatments. We presented our case and reviewed past cases of primary skin and soft-tissue infections caused by Y enterocolitica. We report a case of primary cellulitis and cutaneous abscess caused by Y enterocolitica in an immunocompetent 70-year-old woman with keratodermia tylodes
more » ... almaris progressiva. She presented to an outpatient clinic with redness, swelling, and pain of the left ring finger and left upper arm without fever or gastrointestinal symptoms 3 days before admission. One day later, ulceration of the skin with exposed bone of the proximal interphalangeal joint of the left ring finger developed, and cefditoren pivoxil was described. However, she was admitted to our hospital due to deterioration of symptoms involving the left finger and upper arm. Cefazolin was initiated on admission, then changed to sulbactam/ampicillin and vancomycin with debridement of the left ring finger and drainage of the left upper arm abscess. Wound culture grew Y enterocolitica serotype O:8 and methicillin-sensitive Staphylococcus aureus. Blood cultures were negative and osteomyelitis was ruled out. Vancomycin was switched to ciprofloxacin, then skin and soft-tissue manifestations showed clear improvement within a few days. The patient received 14 days of ciprofloxacin and oral amoxicillin/clavulanate and has since shown no recurrence. We reviewed 12 cases of primary skin and soft-tissue infections caused by Y enterocolitica from the literature. In several past cases, portal entry involved failure of the skin barrier on distal body parts. Thereafter, infection might have spread to the regional lymph nodes from the ruptured skin. Y enterocolitica is typically resistant to aminopenicillins and narrow-spectrum cephalosporins. In most cases, these inefficient antibiotic agents were initially prescribed, but patient conditions rapidly improved after implementing appropriate therapy and drainage. In addition, primary skin and soft-tissue infections occurred even in patients lacking risk factors. Physicians should consider the rare differential diagnosis of Y enterocolitica infection when seeing patients with deteriorating skin lesions under standard treatment, even if the patient is immunocompetent. Abbreviations: MRI = magnetic resonance imaging, MSSA = methicillin-sensitive Staphylococcus aureus, Y enterocolitica = Yersinia enterocolitica.
doi:10.1097/md.0000000000003988 pmid:27368001 pmcid:PMC4937915 fatcat:4wf4rmsdxjh4hcpkxrihlk7lla

Polyolefin Synthesis by Metallocene Catalysts
特集―高分子合成の新展開 メタロセン触媒によるポリオレフィンの合成

Toshio Sasaki, Hirofumi Johoji
1993 Kobunshi  
佐々木俊夫 Toshio Sasaki 常法寺博文 Hirofumi Johoji 住友化学工業(株)千葉研究所 1.は じ め に ポ リエ チ レ ン,ポ リプ ロ ピ レ ン を は じ め と す る ポ リ オ レ フ ィ ン 工 業 は,1953年 のZiegler・Natta触 媒 の 発 見 以 来 数 々 の 改 良 が 積 み 重 ね られ,高 活 性 担 持 型 触 媒 の 開  ... 
doi:10.1295/kobunshi.42.907 fatcat:6cp7tklwwfd43bl3hhlafkb4pi

Usefulness of the Wearable Cardioverter-Defibrillator in Patients at High Risk for Sudden Cardiac Death

Shingo Sasaki, Hirofumi Tomita, Shuji Shibutani, Kei Izumiyama, Takumi Higuma, Taihei Itoh, Kenichi Sasaki, Daisuke Horiuchi, Masaomi Kimura, Ken Okumura
2014 Circulation Journal  
doi:10.1253/circj.cj-14-1098 pmid:25366562 fatcat:vyhxc6no7jexfnpr637gdtxtqi

Multi-reassortant G3P[3] group A rotavirus in a horseshoe bat in Zambia

Michihito Sasaki, Yasuko Orba, Satoko Sasaki, Gabriel Gonzalez, Akihiro Ishii, Bernard M. Hang'ombe, Aaron S. Mweene, Kimihito Ito, Hirofumi Sawa
2016 Journal of General Virology  
The species were identified according to the nucleotide sequence of the gene encoding mitochondrial cytochrome b, as described previously (Sasaki et al., 2012) .  ...  three horseshoe bats were pooled and enriched for viral sequences that were used to generate a library, which was sequenced using the Ion Torrent PGM System (Life Technologies), as described previously (Sasaki  ... 
doi:10.1099/jgv.0.000591 pmid:27574104 fatcat:3gsjp7oz6be5vfrwp7lwtkkrfa

Extensive deep vein thrombosis treatment using fondaparinux and edoxaban: a case report

Kazuhiro Shimizu, Takeshi Sasaki, Takanobu Tomaru, Hirofumi Noike
2016 Thrombosis Journal  
Factor Xa inhibitor is a key drug in the coagulation cascade. Parenteral anticoagulation using low molecular weight heparin or fondaparinux is the recommended form of treatment for most patients presenting with venous thrombosis. Following the acute phase, edoxaban is recommended. We present a case of extensive deep vein thrombosis treated using fondaparinux and edoxaban. Case presentation: A 63-year-old man with redness, pain, and swelling of the left leg lasting for more than 1 month was
more » ... red to our hospital. Ultrasonography revealed a thrombus in the left femoral vein. Computed tomographic angiography revealed clots in the distal right pulmonary artery. Thus, the anticoagulant treatment was initiated with subcutaneous injections of fondaparinux (7.5 mg) for 5 consecutive days, followed by once daily oral administration of edoxaban (60 mg). After 3 months of treatment, a regression of thrombotic clots was shown. Three months later, the remaining clots disappeared, leaving only mural thrombi; no bleeding complications were observed during the treatment period. Conclusion: The anticoagulant treatment with subcutaneous fondaparinux and subsequently with oral edoxaban was effective for treating extensive deep vein thrombosis.
doi:10.1186/s12959-016-0089-x pmid:27468257 pmcid:PMC4962499 fatcat:zxce7fh35zhg3caba6asqhe3oi
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