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Search Results: 1 - 10 of 569 matches for " Hidehiro Sakurai "
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Anti-Addition Mechanism in the Intramolecular Hydroalkoxylation of Alkenes Catalyzed by PVP-Stabilized Nanogold
Hiroaki Kitahara,Hidehiro Sakurai
Molecules , 2012, DOI: 10.3390/molecules17032579
Abstract: (1R*,4S*,4aR*,9aS*,10S*)-10-Hydroxy-10-phenyl-1,4a,9a,10-tetrahydro-1,4-methanoanthracen-9(4H)-one (1c) was prepared for the elucidation of the reaction mechanism of intramolecular hydroalkoxylation of alkenes catalyzed by gold nanoclusters stabilized by a hydrophilic polymer, poly(N-vinyl-2-pyrrolidone) (Au:PVP). It was found that the reaction proceeded via anti-addition of alcohol to the alkene assisted by p-activation of the gold clusters, which is the same mechanism as the hydroamination by toluenesulfonamides.
Magnetically Recoverable Magnetite/Gold Catalyst Stabilized by Poly(N-vinyl-2-pyrrolidone) for Aerobic Oxidation of Alcohols
Hsiao Wei Chen,Arumugam Murugadoss,T. S. Andy Hor,Hidehiro Sakurai
Molecules , 2011, DOI: 10.3390/molecules16010149
Abstract: Fe3O4:PVP/Au nanocomposite synthesized via a two-step procedure was tested as a quasi-homogenous alcohol oxidation catalyst. It was found that the nanocomposite was able to carry out aerobic oxidation of alcohols in water at room temperature. Studies show rapid magnetic recoverability and reusability characteristics.
Tris[2-(deuteriomethylsulfanyl)phenyl]phosphine deuteriochloroform 0.125-solvate
Richard Chee Seng Wong,Mei Lee Ooi,Hidehiro Sakurai,Seik Weng Ng
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808010817
Abstract: The title deuterated tripodal phosphine, C21H12D9PS3·0.125CDCl3, crystallizes as two independent molecules, one of which lies on a general position and the other about a threefold rotation axis, and as a deuteriochloroform solvate. The solvent molecule is disordered about a site of symmetry 3, so that the ratio of phosphine to solvent is 8:1. The P atom adopts a pyramidal coordination geometry.
Transient Macroamylasemia in a Severely Multiple-Handicapped Child Following the Development of Acute Bronchitis  [PDF]
Yoshihiko Sakurai
Open Journal of Pediatrics (OJPed) , 2015, DOI: 10.4236/ojped.2015.53035
Abstract: Macroamylasemia is a condition of elevated serum amylase levels in which normal serum amylase form a complex with high molecular weight proteins such as immunoglobulins. This is a case report on a patient with macroamylasemia following acute asthmatic bronchitis. A 5-year-old male with cerebral palsy and developmental retardation was admitted to our hospital because of high fever and severe cough. Treatment of the respiratory symptoms provided symptomatic improvement, but the serum amylase levels became suddenly elevated. Although acute pancreatitis associated with respiratory infection was initially suspected, a predominant salivary isoamylase, normal serum lipase level, low urine amylase level, and low amylase-creatinine clearance ratio (ACCR) (0.58%) indicated macroamylasemia. The serum amylase level decreased, and the ACCR increased within normal range 2 weeks after discharge. Both of these indicators have been within normal range over the past year. Transient macroamylasemia can be misdiagnosed as acute pancreatitis, especially in a severely multiple-handicapped child who is unable to complain. The ACCR is useful in the diagnosis of macroamylasemia.
Early-Stage Juvenile Fibromyalgia in a 12-Year-Old Girl  [PDF]
Yoshihiko Sakurai
Open Journal of Pediatrics (OJPed) , 2015, DOI: 10.4236/ojped.2015.54053
Abstract: Juvenile fibromyalgia (JFM) is often diagnosed at a later stage. Therefore, little is known about its early phase. A 12-year-old girl with persistent lumbago without fever consulted an orthopedist, but imaging studies showed no abnormalities and analgesics were ineffective. She therefore visited our pediatric clinic. On digital palpation, she had pain in 13 of the 18 tender point sites of fibromyalgia. The blood test results were unremarkable. A medical interview revealed character tendencies often seen in patients with JFM; she was serious-minded, uncompromising, and showed excessive concern for others. Furthermore, psychological stress for the approaching annual sports day might have built up. All factors considered, early-stage JFM was the probable diagnosis. The patient accepted the diagnosis and understood that the disease may be psychogenic. Getting through the sports day cured her symptoms. This case highlights the importance of initial care, including a detailed explanation, in those with JFM.
Construction of Subsurface Geological Structures Using a Drilling Database: A Case Study for an Intra-Arc Basin, the Osaka Plain, Southwest Japan  [PDF]
Minao Sakurai, Fujio Masuda
Open Journal of Geology (OJG) , 2013, DOI: 10.4236/ojg.2013.32006
Abstract:

Subsurface geological cross sections of 0 - 200 m depth were constructed using a dense drilling database of the Osaka Plain in the intra-arc Osaka Basin of the Japan island arc, an active plate margin. The cross sections revealed the subsurface geological structures and the geometry of folding and faulting in the basin. The comparison between the constructed subsurface cross sections and the seismic sections of the basement and basin fills at a depth of 1500 - 2000 m showed that the basement and shallow subsurface structures are similar; however, the shallow cross sections were of higher resolution than the deep seismic profiles.

Familiar and Unfamiliar Face Recognition in a Crowd  [PDF]
Hiroshi Ito, Aki Sakurai
Psychology (PSYCH) , 2014, DOI: 10.4236/psych.2014.59113
Abstract:

The purpose of the present study was to investigate whether the visual search process for familiar faces differs from that for unfamiliar faces. We used a single-target visual search task and recorded eye movements of participants during the task. We employed three different types of face familiarity: personally familiar faces (friends and teachers), famous faces, and unfamiliar faces. Participants had to search through arrays of faces for a target face. In each trial, a target face and three distractor faces were horizontally aligned and presented at the same time. In the personally familiar or famous condition, the target was a personally familiar face or a famous face, respectively, and the distractor faces were unfamiliar. In the unfamiliar condition, the target was an unfamiliar face and the distractor faces were personally familiar. The reaction times to identify the target demonstrated that the visual search for unfamiliar faces is slower than that for personally familiar faces and famous faces, but there was no significant difference between reaction times to recognize the personally familiar and the famous face targets. Additionally, the eye movement results in the unfamiliar face condition showed that an exhaustive search of the entire array occurred more frequently than a self-terminating search, but this was not true for both the personally familiar faces and famous faces conditions. These results suggest that the visual search process for familiar faces (personally familiar and famous) in a crowd differs from that for unfamiliar faces.

Mitochondrial Respiration Is Associated with Alloxan-Induced Mitochondrial Permeability Transition  [PDF]
Koichi Sakurai, Mika Itoh
Journal of Biophysical Chemistry (JBPC) , 2016, DOI: 10.4236/jbpc.2016.74008
Abstract: We previously showed that increased mitochondrial inner membrane permeability which is known as mitochondrial permeability transition (MPT) is triggered by adding succinate in the presence of the diabetogenic agent alloxan. Here, our aim was to investigate whether mitochondrial respiration is associated with alloxan-induced MPT. After mitochondria isolated from rat liver were incubated with alloxan at 37°C for 5 min, the addition of succinate immediately triggered the MPT in the presence of rotenone. However, little or no induction occurred at incubation temperatures below 25°C. Malate/glutamate also triggered MPT by alloxan in the absence of rotenone. In mitochondrial suspensions containing alloxan, succinate accelerated oxygen consumption that was completely inhibited by cyanide. These results suggest that mitochondrial respiration is associated with the alloxan-induced MPT. Alloxan radical production was investigated using ESR spectroscopy. Mitochondria incubated with succinate and alloxan elicited low signal intensity (radical formation) that increased significantly in the presence of cyanide. When the incubation of alloxan with mitochondria after the addition of succinate, a little intensity of the signal was observed, but it was remarkably increased after the addition of cyanide. Ubiquinone analogues inhibited the MPT induction. These results suggest that the initiation of MPT is associated with alloxan redox cycling via an electron transfer process at a quinone-binding site in respiratory mitochondria.
Construction Sequence of the Koh Ker Monuments Constrained by the Chemical Composition and Magnetic Susceptibility of Its Bricks  [PDF]
Etsuo Uchida, Yuichiro Sakurai
Archaeological Discovery (AD) , 2018, DOI: 10.4236/ad.2018.62009
Abstract: Using a portable X-ray fluorescence analyzer and magnetic susceptibility meter, we measured fired bricks from nine temples (Prasat Thom, Prasat Damrei, Prasat Chamreh, Prasat Krachap, Prasat Kraham, Prasat Chen, Prasat Banteay Pir Chan, Prasat Chrap, and Prasat Pram) of the Koh Ker monuments, Cambodia. Based on cluster analysis of the chemical compositional data for Ti, Fe, Rb, Y, and Zr, as well as magnetic susceptibility data, the brick buildings could be classified into four groups (Stages A to D). Taking into consideration the five construction stages (Stages ① to ⑤) defined by Uchida et al. (2014) for laterite buildings, and using the assumption that all buildings were basically constructed outwards from the center, we define a construction sequence for these brick buildings. Thus, the following chronological relationship was obtained for construction stages of both laterite and brick buildings: Stage A → Stages B & ① → Stages C & ② → Stages D & ③ → Stage ④ → Stage ⑤. We surmise that the Northern Libraries of Prasat Pram, Prasat Chen and Prasat Damrei were added after the construction of their Inner Enclosures.
Factor Analysis of Acute Ward Nurses’ Concepts of Life and Death  [PDF]
Yusuke Sakurai, Miwa Yamamoto
Open Journal of Nursing (OJN) , 2018, DOI: 10.4236/ojn.2018.89047
Abstract: Background: The Ministry of Public Management, Home Affairs, Posts and Telecommunications announced that the proportion of elderly people aged 65 or over in the total population of Japan reached a record high of 26.7% in the present Japan. Aims: This paper aimed to clarify from acute ward nurses’ concepts of life and death in Japan. Methods: Questionnaires were distributed to 720 nurses working in acute care hospital A in the Kansai area in Japan. Distribution destinations were all wards except for operating rooms and outpatient clinics. We initially classified the 27 items from Hirai et al.’s death and life scale into the initial seven factors (via promax rotation). Operational Definition: In my analysis, I relied considerably on the seven-point Likert scale of the Concept of life and death. Ethical Considerations: The present study was approved by the Tottori University Ethics Review Committee (1603 A 156). Results: The initial factor analysis revealed that 10 of the 27 items were inadequate. Thus, a second analysis was conducted on the remaining 17 items. The KMO analysis produced a value of 0.8. A Bartlett’s test produced a significant result (p < 0.001), and Cronbach’s α was 0.8, which was the result obtained during initial scale validity checks. The present analysis led to the extraction of 4 factors with eigenvalues greater than 1, with a cumulative contribution rate of 62.8%. Consideration: The first factor comprised all subscales except for the “death avoidance” subscale, which fit better within the fourth factor. These factors included “A comprehensive view of life and death” “Sharing the fate of death and liberation” “Death fear, anxiety, and avoidance”, and “Liberation from life and a world after death”.
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