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Search Results: 1 - 10 of 2931 matches for " Satoshi Furukawa "
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Spontaneous fourfold-symmetry breaking driven by electron-lattice coupling and strong correlations in high-$T_c$ cuprates
Satoshi Okamoto,Nobuo Furukawa
Physics , 2012, DOI: 10.1103/PhysRevB.86.094522
Abstract: Using dynamical-mean-field theory for clusters, we study the two-dimensional Hubbard model in which electrons are coupled with the orthorhombic lattice distortions through the modulation in the hopping matrix. Instability towards spontaneous symmetry breaking from a tetragonal symmetric phase to an orthorhombic distorted phase is examined as a function of doping and interaction strength. A very strong instability is found in the underdoped pseudogap regime when the interaction strength is large enough to yield the Mott insulating phase at half filling. The symmetry breaking accompanies the recovery of quasiparticle weights along one of the two antinodal directions, leading to the characteristic Fermi arc reconnection. We discuss the implications of our results to the fourfold symmetry breaking reported in systems where the underlying crystal does not have any structural anisotropy.
Variation of blood vessels in the cranial-cervical legion  [PDF]
Satoshi Furukawa, Satomu Morita, Hayato Okunaga, Lisa Wingenfeld, Katsuji Nishi
Forensic Medicine and Anatomy Research (FMAR) , 2013, DOI: 10.4236/fmar.2013.14016
Abstract: The blood vessels in the head and neck have several main roots for supplying blood to the brain and returning of blood to the heart. It was well known that each artery and vein in the head and neck has its variation. The variation of the vessels some times gives rise to unexpectable findings, which are not described in the textbook. In this study we like to show the morphological variations observed at routine autopsy cases and some forensic pathological findings caused by those variations.
A Case and Review of Death Associated with Ingestion of Detergent  [PDF]
Satoshi Furukawa, Satomu Morita, Katsuji Nishi, Masahito Hitosugi
Forensic Medicine and Anatomy Research (FMAR) , 2014, DOI: 10.4236/fmar.2014.24015
Abstract: We experienced an autopsy case of a death associated with ingestion of liquid detergent. The deceased was an 82-year-old woman who was found dead in her bed room. Autopsy revealed corrosive changes of the mucosal surfaces of the lung. The larynx, trachea and stomach contained mucoid matter with abundant froth. Toxicological investigations detected polyethylene glycol in the bronchus, blood and gastric contents using headspace-gas chromatography/mass spectrometry. Surfactants generally have low toxicity but can cause damage to the mucous membrane of the respiratory tract. We report here an autopsy case of death by suicidal ingestion of liquid detergent with special regard to the histochemical findings of the case study.
Autopsy-Based Study of Abdominal Traffic Trauma Death after Emergency Room Arrival  [PDF]
Satoshi Furukawa, Satomu Morita, Katsuji Nishi, Masahito Hitosugi
Forensic Medicine and Anatomy Research (FMAR) , 2015, DOI: 10.4236/fmar.2015.33013
Abstract: We experienced the autopsy cases that the deceased was alive in emergency room on arrival. Bleeding is the leading cause of preventable death after injury. This retrospective study aimed to characterize opportunities for performance improvements identified in patients who died from traffic trauma and were considered by the quality improvement of education system. We focused the abdominal traffic trauma injury. An autopsy-based cross-sectional study was conducted. A purposive sampling technique was applied to select the study sample of 41 post-mortems of road traffic accident. 16 patients (39.0%) were abdominal trauma injury. The mean period of survival after meeting with accident was 13.5 hours, and compared abdominal trauma death was 27.4 hours longer. In road traffic accidents, the most injured abdominal organs were the liver followed by mesentery. We thought that delayed treatment was associated with immediate diagnostic imaging, and so expected to expand trauma management examination.
Enhanced Photocatalytic Degradation of Bisphenol A in Aqueous Solution by Ag-Doping ZnO  [PDF]
Nobuyuki Hoshiyama, Ahmed H. A. Dabwan, Hideyuki Katsumata, Tohru Suzuki, Mai Furukawa, Satoshi Kaneco
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2016, DOI: 10.4236/ojinm.2016.63003
Abstract: The metal-doping into the photocatalyst was evaluated for the photocatalytic degradation of bisphenol A in aqueous solution with ZnO powder. Au/ZnO, Ag/ZnO and Cu/ZnO were tested in the present work. Ag-doping ZnO was effective for the improvement of efficiency for the photocatalytic degradation of bisphenol A in water. The optimum doping concentration of silver was found to be 3 wt%. The pseudo first-order rate constant with 3 wt% Ag/ZnO was 1.3 times better compared with bare ZnO. The photocatalytic degradation of treatment for the wastewater containing bisphenol A is simple, easy handling and low cost.
Enhanced Removal of Arsenite from Ground Water by Adsorption onto Heat-Treated Rice Husk  [PDF]
Abdus Samad, Takumi Fukumoto, Ahmed H. A. Dabwan, Hideyuki Katsumata, Tohru Suzuki, Mai Furukawa, Satoshi Kaneco
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2016, DOI: 10.4236/ojinm.2016.63004
Abstract: The effect of heat treatment for rice husk was investigated on the removal of arsenite in ground water by the adsorption onto the rice husk surface. The heat treatment was performed at the temperature from 80oC to 300oC in the closed system under anoxic environment. The continuous adsorption column method was applied for the removal of arsenite. The removal efficiency (75%) with rice husk treated at 150oC was better compared to those (54%) obtained with untreated rice husk. Therefore, the heat treatment of rice husk at relatively low temperature was effective for the enhancement of arsenic removal from water. The treatment conditions of As removal from aqueous solution were optimized. The developed treatment technique was applied into the real ground water sample in Bangladesh. The As concentration in sample water after treatment was approximately 18 and 8 μg/L, which was below the WHO guideline value of maximum admissible level of arsenic in ground water for Bangladesh (50 μg/L). The developed technique might become a potential avenue for simple and low cost arsenic removal methods.
Evaluation of Reaction Mechanism for Photocatalytic Degradation of Dye with Self-Sensitized TiO2 under Visible Light Irradiation  [PDF]
Md. Ashraful Islam Molla, Ikki Tateishi, Mai Furukawa, Hideyuki Katsumata, Tohru Suzuki, Satoshi Kaneco
Open Journal of Inorganic Non-metallic Materials (OJINM) , 2017, DOI: 10.4236/ojinm.2017.71001
Abstract: The dye-sensitized TiO2 method is one of the most promising methods for the visible-light-induced detoxification of pollutants. The reaction mechanism for photocatalytic degradation of orange II (OII) and rhodamine B (RhB) with self-sensitized TiO2 under visible light irradiation (λ > 400 nm) has been evaluated. Radical scavenger studies were carried out to investigate the active species involved in the photodegradation of 5 mg/L of initial concentration of OII and RhB at room temperature. The trapping effects of different scavengers results proved that the oxidation of OII and RhB mainly occurred by the direct oxidization of h+ and ·O2- radicals, while the ·OH radicals played only a relatively minor role in the direct oxidization process.
AMP N1-Oxide, a Unique Compound of Royal Jelly, Induces Neurite Outgrowth from PC12 Vells via Signaling by Protein Kinase A Independent of that by Mitogen-Activated Protein Kinase
Noriko Hattori,Hiroshi Nomoto,Hidefumi Fukumitsu,Satoshi Mishima,Shoei Furukawa
Evidence-Based Complementary and Alternative Medicine , 2010, DOI: 10.1093/ecam/nem146
Abstract: Earlier we identified adenosine monophosphate (AMP) N1-oxide as a unique compound of royal jelly (RJ) that induces neurite outgrowth (neuritegenesis) from cultured rat pheochromocytoma PC12 cells via the adenosine A2A receptor. Now, we found that AMP N1-oxide stimulated the phosphorylation of not only mitogen-activated protein kinase (MAPK) but also that of cAMP/calcium-response element-binding protein (CREB) in a dose-dependent manner. Inhibition of MAPK activation by a MEK inhibitor, PD98059, did not influence the AMP N1-oxide-induced neuritegenesis, whereas that of protein kinase A (PKA) by a selective inhibitor, KT5720, significantly reduced neurite outgrowth. AMP N1-oxide also had the activity of suppressing the growth of PC12 cells, which correlated well with the neurite outgrowth-promoting activity. KT5720 restored the growth of AMP N1-oxide-treated PC12 cells. It is well known that nerve growth factor suppresses proliferation of PC12 cells before causing stimulation of neuronal differentiation. Thus, AMP N1-oxide elicited neuronal differentiation of PC12 cells, as evidenced by generation of neurites, and inhibited cell growth through adenosine A2A receptor-mediated PKA signaling, which may be responsible for characteristic actions of RJ.
Royal Jelly Facilitates Restoration of the Cognitive Ability in Trimethyltin-Intoxicated Mice
Noriko Hattori,Shozo Ohta,Takashi Sakamoto,Satoshi Mishima,Shoei Furukawa
Evidence-Based Complementary and Alternative Medicine , 2011, DOI: 10.1093/ecam/nep029
Abstract: Trimethyltin (TMT) is a toxic organotin compound that induces acute neuronal death selectively in the hippocampal dentate gyrus (DG) followed by cognition impairment; however the TMT-injured hippocampal DG itself is reported to regenerate the neuronal cell layer through rapid enhancement of neurogenesis. Neural stem/progenitor cells (NS/NPCs) are present in the adult hippocampal DG, and generate neurons that can function for the cognition ability. Therefore, we investigated whether royal jelly (RJ) stimulates the regenerating processes of the TMT-injured hippocampal DG, and found that orally administered RJ significantly increased the number of DG granule cells and simultaneously improved the cognitive impairment. Furthermore, we have already shown that RJ facilitates neurogenesis of cultured NS/NPCs. These present results, taken together with previous observations, suggest that the orally administered RJ may be a promising avenue for ameliorating neuronal function by regenerating hippocampal granule cells that function in the cognition process.
Neurotrophic Effect of Citrus Auraptene: Neuritogenic Activity in PC12 Cells
Yoshiko Furukawa,Sono Watanabe,Satoshi Okuyama,Mitsunari Nakajima
International Journal of Molecular Sciences , 2012, DOI: 10.3390/ijms13055338
Abstract: The activation of extracellular signal-regulated kinases (ERK) leads to a number of cellular changes associated with the development of long-term memory. Using cultured cortical neurons, we previously showed that the n-hexane extract prepared from the peels of Citrus grandis (Kawachi bankan) induces the activation of ERK1/2 and that one of the compounds with this ability in the extract is 3,5,6,7,8,3′,4′-heptamethoxyflavone (HMF), a Citrus polymethoxyflavone. In fact, we found that HMF has the ability to rescue mice from drug-induced learning impairment. This hexane extract contains auraptene (AUR), a coumarin derivative with a monoterpene unit, together with HMF. The present study was designed to investigate the effect of AUR in vitro. Our results show that 1) AUR had the ability to induce the activation of ERK1/2 in not only cortical neurons but also the rat pheochromocytoma cell line (PC12 cells), which is a model system for studies on neuronal proliferation and differentiation; and 2) AUR had the ability to promote neurite outgrowth from PC12 cells.
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