Masaaki Ogawa

ORCID: 0000-0003-4615-8412
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About
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Research Areas
  • Dental Radiography and Imaging
  • Radiation Dose and Imaging
  • Cancer Treatment and Pharmacology
  • Semiconductor materials and devices
  • Neurotransmitter Receptor Influence on Behavior
  • Medical Imaging Techniques and Applications
  • Advanced X-ray and CT Imaging
  • Advancements in Semiconductor Devices and Circuit Design
  • Fish Biology and Ecology Studies
  • Dental materials and restorations
  • Bone and Dental Protein Studies
  • Digital Radiography and Breast Imaging
  • Neuroscience and Neuropharmacology Research
  • Congenital Heart Disease Studies
  • Chronic Lymphocytic Leukemia Research
  • Fluoride Effects and Removal
  • Laser Applications in Dentistry and Medicine
  • Photonic and Optical Devices
  • Gastric Cancer Management and Outcomes
  • Semiconductor materials and interfaces
  • Hepatocellular Carcinoma Treatment and Prognosis
  • Dental Health and Care Utilization
  • Mercury impact and mitigation studies
  • Photoreceptor and optogenetics research
  • Nanowire Synthesis and Applications

Shiga University of Medical Science
2024

Kyoto University
2002-2023

National Institute for Physiological Sciences
2022-2023

Toshiba (Japan)
2019

Innovative Micro Technology (United States)
2016

Massachusetts Institute of Technology
2012-2014

McGovern Institute for Brain Research
2014

Nippon Dental University
1991-2013

University of Maryland, Baltimore
2013

National Hospital Organization Hanamaki Hospital
2012

Due to the strong Fermi-level pinning close germanium (Ge) valence band edge, all metal/p-type Ge contacts show Ohmic characteristics, while metal/n-type exhibit rectifying behaviors. In this paper, we report a simple method alleviate effect by inserting thin layer of aluminum oxide (Al2O3), formed oxidation (Al), between metal/Ge interface. The effective Schottky barrier heights nickel (Ni)∕n-type Ge, cobalt (Co)∕n-type and iron (Fe)∕n-type decrease from 0.54, 0.62, 0.61eV 0.39, 0.23,...

10.1063/1.3028343 article EN Applied Physics Letters 2008-11-17

Neural correlates of reward prediction errors (RPEs) have been found in dorsal striatum. Such signals may be important for updating associative action representations within In order that the appropriate can updated, it might RPE signal to specific led error. However, RPEs signaled by midbrain dopamine neurons, which project heavily striatum, are not action-specific. Here we tested whether RPE-like activity striatum is action-specific; recorded single-unit posterior dorsomedial and...

10.1523/jneurosci.0832-12.2012 article EN cc-by-nc-sa Journal of Neuroscience 2012-07-25

To obtain more of a particular uncertain reward, animals must learn to actively overcome the lack reward and adjust behavior it again. The neural mechanisms underlying such coping with omission remain unclear. Here, we developed task in rats monitor active behavioral switch toward next after no reward. We found that some dopamine neurons ventral tegmental area exhibited increased responses unexpected decreased following opposite well-known signal prediction error (RPE). increase reflected...

10.1126/sciadv.ade5420 article EN cc-by-nc Science Advances 2023-03-10

Surface-assisted orientational control of discotic liquid crystals (DLCs) induced by photoaligning thin films an azobenzene-containing polymer is described. The photochemical technique developed can be used to photopattern DLC (see Figure), which may have applications in novel molecular devices such as optical compensatory sheets, and provides opportunity for understanding the orientation mechanism DLCs.

10.1002/1521-4095(200006)12:13<950::aid-adma950>3.0.co;2-v article EN Advanced Materials 2000-06-01

Intracellular Ca2+ concentrations ([Ca2+]i) are regulated in a spatiotemporal manner via both entry of extracellular and mobilization from intracellular stores. Metabotropic glutamate receptor subtype 1 (mGluR1) is G protein-coupled that stimulates the inositol 1,4,5-trisphosphate-Ca2+ signaling cascade, whereas Cav2.1 pore-forming channel protein P/Q-type voltage-sensitive channels. In this investigation, we showed mGluR1 colocalized at dendrites cerebellar Purkinje neurons form heteromeric...

10.1074/jbc.m303266200 article EN cc-by Journal of Biological Chemistry 2003-06-29

Purpose: We report the outcomes of a randomized clinical trial single-port laparoscopic cholecystectomy (SPLC) and multiport (MPLC). Methods: Fifty-four patients (27 in each group) were randomized. A visual analog scale was used with 10-point for an objective assessment incisional pain cosmesis on postoperative days 1, 3, 14. Results: The mean operating time significantly longer SPLC. scores 3 (9.7 vs. 8.9, P=0.01) 14 (9.9 9.2, P<0.01) greater SPLC group than MPLC group. group’s pain, their...

10.1097/sle.0b013e3182631a9a article EN Surgical Laparoscopy Endoscopy & Percutaneous Techniques 2012-10-01

Band-inversion phenomena, found in recent computer simulation and real experiment of steady-state gel electrophoresis, is theoretically analyzed by a simple model that describes the conformational change DNA reptating through gel. The predicts distribution function end-to-end vector mobility, which agrees quite well with result without use any adjustable parameters.

10.1103/physrevlett.61.1893 article EN Physical Review Letters 1988-10-17

A 3-D flash memory cell of VRAT (vertical-recess-array-transistor) has been fabricated using a unique and simple integration method PIPE (planarized on the same plane), which allows for successful implementation ultra high density memory. In addition, procedures to increase further another advanced structure, Zigzag-VRAT (Z-VRAT), are developed.

10.1109/vlsit.2008.4588587 article EN Symposium on VLSI Technology 2008-06-01

Even though the strong Fermi-level pinning at metal/germanium (Ge) interface can be alleviated by inserting a thin layer of tunneling oxide, still sizeable Schottky barriers and wide depletion regions Fe/oxide/n-Ge contacts make junction resistances strongly dependent temperature. The resistance-area (RA) products these junctions are too high for spin injection cannot tuned simply varying oxide thickness or using ferromagnetic metal (FM) with lower work function. In this work, low energy ion...

10.1063/1.3157128 article EN Applied Physics Letters 2009-06-15

Tamalin is a scaffold protein that interacts with metabotropic glutamate receptors and the kinase-deficient neurotrophin TrkCT1 receptor forms complex multiple protein-trafficking intracellular signaling molecules. In culture, tamalin promotes trafficking of group 1 through its interaction guanine nucleotide exchange factor cytohesins causes actin reorganization membrane ruffling via TrkCT1/cytohesin-2 mechanism. However, how serves physiological function in vivo has remained elusive. this...

10.1073/pnas.0706945104 article EN Proceedings of the National Academy of Sciences 2007-09-01

It is known that a high concentration of iron deposited in the enameloid some teleostean fish. Previously, Suga et al. (1989) pointed out related to phylogeny fish rather than feeding habits, according results quantitative analyses on teeth marine teleost Tetraodontiformes. In present study, order for previous idea be verified, analysis was made with an electron microprobe offish belonging Perciformes, which largest group world and consists both freshwater species. The all examined (57...

10.1177/00220345920710060901 article EN Journal of Dental Research 1992-06-01

We investigated correlations between laboratory test results and multicentric development of hepatitis C virus (HCV)-related hepatocellular carcinoma (HCC) in 202 patients who underwent liver resection. Two types HCC were considered to meet multicentricity criteria: one, at least one tumor was well-differentiated, with other being less differentiated; the other, all tumors included well-differentiated or without differentiated components. Forty-five had HCC. Platelet counts lower than...

10.1016/j.hepres.2004.10.005 article EN Hepatology Research 2004-12-01

The disturbed pattern of mineralization developing enamel the rat incisor after oral administration SrCl2 and NaF was investigated in an attempt to disclose possible mechanisms which might not be readily detectable under normal conditions, but may control progressive enamel, especially during maturation stage. Undemineralized ground sections upper incisors were examined by contact microradiography, tetracycline labeling, electron microprobe analysis. It clear that Sr F disturb stage a...

10.1177/08959374870010022601 article EN Advances in Dental Research 1987-12-01

In this study, morphological shape, elemental distribution and elution properties of Ca, P, Mg in four types calcium phosphate powder were investigated using SEM, EPMA ICP-AES. Calcium powder: OHAp, DCPD, β-TCP OCP observed the white form photopolymerized adhesive monomer they scattered like dispersed fillers resin composite. analysis, CaKα showed a relatively high concentration relation to PKα. each different Ca P. But was almost equal detection limit Namely it suggested that reparative...

10.4012/dmj.2009-023 article EN Dental Materials Journal 2010-01-01

The body's response to stress is comprised of two opposing reactions, namely inflammation and immunosuppression. balance between these reactions not only changes over time, but also varies among different cells or organs. Limited information available regarding the cytokine circulating blood inflammatory sites after thoracic surgical stress.The subjects present study were 10 patients undergoing esophageal cancer surgery which requires thoracolaparotomic manipulation. postoperative levels...

10.1159/000049718 article EN European Surgical Research 2001-01-01
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