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Kamogawa K, Tomita H, Okamoto K, Okuda B. Useless Hand Syndrome with Astereognosis in Multiple Sclerosis (P04.101). Neurology 2012. [DOI: 10.1212/wnl.78.1_meetingabstracts.p04.101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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102
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Konishi H, Ichikawa D, Komatsu S, Shiozaki A, Tsujiura M, Takeshita H, Morimura R, Nagata H, Arita T, Kawaguchi T, Hirashima S, Fujiwara H, Okamoto K, Otsuji E. Detection of gastric cancer-associated microRNAs on microRNA microarray comparing pre- and post-operative plasma. Br J Cancer 2012; 106:740-7. [PMID: 22262318 PMCID: PMC3322946 DOI: 10.1038/bjc.2011.588] [Citation(s) in RCA: 152] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Background: Recently, it was reported that plasma microRNAs (miRNAs) are low-invasive useful biomarkers for cancer. We attempted to isolate gastric cancer (GC)-associated miRNAs comparing pre- and post-operative paired plasma, thereby excluding the possible effects of individual variability. Methods: This study was divided into four steps: (1) microarray analysis comparing pre- and post-operative plasma; (2) validation of candidate miRNAs by quantitative RT–PCR; (3) validation study of selected miRNAs using paired plasma; and (4) comparison of the levels of selected miRNAs in plasma between healthy controls and patients. Results: From the results of microarray analysis, nine candidate miRNAs the levels of which were markedly decreased in post-operative plasma were selected for further studies. After confirmation of their post-operative marked reduction, two candidate miRNAs, miR-451 and miR-486, were selected as plasma biomarkers, considering the abundance in plasma, and marked decrease in post-operative samples. In validation, the two miRNAs were found to decrease in post-operative plasma in 90 and 93% of patients (both P<0.01). In comparison with healthy controls, the levels of both miRNAs were found to be significantly higher in patients, and the area under the curve values were high at 0.96 and 0.92. Conclusion: Plasma miR-451 and miR-486 could be useful blood-based biomarkers for screening GC.
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103
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Okamoto K, Okamoto Y, Kawakubo T, Iwata JI, Yasuda Y, Tsukuba T, Yamamoto K. Role of the transcription factor Sp1 in regulating the expression of the murine cathepsin E gene. J Biochem 2011; 151:263-72. [DOI: 10.1093/jb/mvr135] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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104
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Chang Z, Okamoto K, Bereiter DA. Differential ascending projections of temporomandibular joint-responsive brainstem neurons to periaqueductal gray and posterior thalamus of male and female rats. Neuroscience 2011; 203:230-43. [PMID: 22155654 DOI: 10.1016/j.neuroscience.2011.11.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 11/13/2011] [Accepted: 11/18/2011] [Indexed: 01/03/2023]
Abstract
Several craniofacial pain conditions, including temporomandibular joint disorders (TMJDs), are more prevalent in women than men. The basis for sex differences in deep craniofacial pain is not known. The present study compared the magnitude of ascending projections from temporomandibular joint (TMJ)-responsive neurons in trigeminal brainstem with the ventrolateral periaqueductal gray (vlPAG) or posterior nucleus of the thalamus (Po) in males and female rats. Fluorogold (FG) was injected into vlPAG or Po, and TMJ-responsive neurons were identified by Fos-like immunoreactivity (Fos-LI) after mustard oil injection. TMJ-evoked Fos-LI was similar in males and females; however, significant differences in cell counts were seen for FG single-labeled and Fos/FG double-labeled neurons in trigeminal brainstem. After vlPAG injections, the number of FG-labeled neurons in trigeminal subnucleus interpolaris (Vi), ventral interpolaris/caudalis transition (vl-Vi/Vc), and dorsal paratrigeminal region (dPa5) was greater in females than males. The percentage of Fos/FG double-labeled neurons in vl-Vi/Vc and dPa5 after vlPAG injection also was greater in females than males. In contrast, after Po injections, males displayed a greater number of FG-labeled neurons in superficial laminae (Lam I/II) of trigeminal subnucleus caudalis (Vc) and upper cervical spinal cord (C(1-2)) and deeper laminae (Lam III/V) at C(1-2) than females. The percentage of Fos/FG double-labeled neurons in Lam I/II of Vc after Po injection also was greater in males than females. These data revealed significant sex differences in ascending projections from TMJ-responsive neurons in trigeminal brainstem. Such differences may influence the ability of males and females to recruit autonomic reflexes and endogenous pain control circuits relevant for TMJ nociception.
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105
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Morimura R, Komatsu S, Ichikawa D, Takeshita H, Tsujiura M, Nagata H, Konishi H, Shiozaki A, Ikoma H, Okamoto K, Ochiai T, Taniguchi H, Otsuji E. Novel diagnostic value of circulating miR-18a in plasma of patients with pancreatic cancer. Br J Cancer 2011; 105:1733-40. [PMID: 22045190 PMCID: PMC3242609 DOI: 10.1038/bjc.2011.453] [Citation(s) in RCA: 202] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 09/28/2011] [Accepted: 10/05/2011] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Several recent studies have demonstrated that microRNAs (miRNAs) are stably detectable in the plasma/serum. We hypothesised that miR-18a in the plasma is a potential biomarker in patients with pancreatic cancer. METHODS miR-18a is located in the miR-17-92 cluster and reported to be highly expressed in pancreatic cancer tissues. This study was divided into three parts: (1) Confirmation of higher miR-18a levels in primary pancreatic cancer tissues and cell lines than in normal pancreatic tissues and a human fibroblast cell line. (2) Evaluation of the plasma miR-18a assay using quantitative RT-PCR by comparing plasma results obtained from 36 patients with pancreatic cancer and from 30 healthy volunteers. (3) Evaluation of the assay for monitoring tumour dynamics in patients with pancreatic cancer. RESULTS (1) The expression of miR-18a was significantly higher in pancreatic cancer tissues (P=0.012) and pancreatic cancer cell lines (P=0.015) than in normal tissues and fibroblasts. (2) Plasma concentrations of miR-18a were significantly higher in pancreatic cancer patients than in controls (P<0.0001). The value of the area under the receiver-operating characteristic curve (AUC) was 0.9369. (3) Plasma levels of miR-18a were significantly lower in postoperative samples than in preoperative samples (P=0.0077). CONCLUSION Circulating miR-18a might provide new complementary tumour markers for pancreatic cancer.
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106
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Tashiro A, Okamoto K, Bereiter DA. Rapid estrogenic effects on TMJ-responsive brainstem neurons. J Dent Res 2011; 91:210-4. [PMID: 22058119 DOI: 10.1177/0022034511428156] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Estrogen status is a risk factor for temporomandibular muscle and joint disorders (TMJD) and other craniofacial pain conditions. The basis for estrogen modulation of pain is poorly understood and has often been attributed to long-term genomic effects. However, estrogens also act rapidly through membrane-initiated mechanisms to alter neural activity. To assess if estrogens act rapidly to affect TMJ-responsive neurons, we applied 17β-estradiol (E2) directly at the spinomedullary (Vc/C(1-2)) region, the initial brainstem site for synaptic integration of TMJ sensory signals, while recording single neuron activity. In ovariectomized female rats, E2 rapidly (within 10 minutes) and reversibly reduced TMJ-evoked neural activity at the Vc/C(1-2) region. The effect was estrogen receptor (ER) subtype-specific, since ERβ agonists inhibited, while an ERβ agonist enhanced, evoked activity. A membrane-mediated mechanism was indicated, since the membrane-impermeable analogue, E(2)-BSA, mimicked the inhibitory effect of E2 and was prevented by an ER antagonist. This study demonstrated that E2 acted rapidly, through membrane-mediated pathways, and locally at the Vc/C(1-2) region, to modulate sensory signals from the TMJ region. These results were consistent with the hypothesis that estrogens can act rapidly at the level of the trigeminal brainstem complex to influence sensory integration of TMJ-related information.
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107
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Sato R, Fujiya M, Watari J, Ueno N, Moriichi K, Kashima S, Maeda S, Ando K, Kawabata H, Sugiyama R, Nomura Y, Nata T, Itabashi K, Inaba Y, Okamoto K, Mizukami Y, Saitoh Y, Kohgo Y. The diagnostic accuracy of high-resolution endoscopy, autofluorescence imaging and narrow-band imaging for differentially diagnosing colon adenoma. Endoscopy 2011; 43:862-8. [PMID: 21732270 DOI: 10.1055/s-0030-1256510] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
BACKGROUND AND STUDY AIMS Conventional colonoscopy can result in unnecessary biopsy or endoscopic resection due to its inability to distinguish adenomas from hyperplastic polyps. This study therefore evaluated the efficacy of high-resolution endoscopy (HRE), autofluorescence imaging (AFI), and narrow-band imaging (NBI) in discriminating colon adenoma from hyperplastic polyps. PATIENTS AND METHODS This was a prospective multicenter study in patients undergoing AFI and NBI examinations. HRE, AFI, and NBI images were classified into two groups based on morphological characteristics, the predominant color intensities, and the visibility of meshed capillary vessels, respectively. Each of the endoscopic photographs were independently evaluated by a single endoscopist. The images were then assessed by three specialists and three residents, the latter having performed < 500 colonoscopies and < 30 NBI and AFI examinations. Diagnostic test statistics were calculated to compare the accuracy in differentiating colon adenoma from hyperplastic polyps for each method. RESULTS A total of 183 patients were enrolled in the study and 339 adenomas and 85 hyperplastic polyps were identified. AFI and NBI could distinguish adenoma from hyperplastic polyps with an accuracy of 84.9 % and 88.4 %, respectively, whereas HRE exhibited an accuracy of 75.9 %. In the 358 lesions in which the AFI diagnosis was consistent with that of NBI, the accuracy, sensitivity, and specificity were high, at 91.9 %, 92.7 %, and 92.9 %, respectively. During the study comparing specialists and residents, AFI and NBI dramatically improved the diagnostic accuracy of residents from 69.1 % to 86.1 % and 84.7 %, respectively. CONCLUSIONS Both AFI and NBI are considered to be feasible tools that can discriminate colon adenoma from hyperplastic polyps, and their use may be particularly beneficial for less-experienced endoscopists.
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108
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Fujita Y, Ikeda M, Yanagisawa T, Senoo Y, Okamoto K. Different clinical and neuropathologic phenotypes of familial ALS with A315E TARDBP mutation. Neurology 2011; 77:1427-31. [DOI: 10.1212/wnl.0b013e318232ab87] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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109
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Hasunuma H, Takagi M, Shiga S, Uno S, Kokushi E, Mukai S, Kuriyagawa T, Takagaki K, Matsumoto D, Okamoto K, Deguchi E, Fink-Gremmels J. Monitoring natural feed contamination in beef cattle by measurements of urinary zearalenone concentrations after oral administration of mycotoxin adsorbents as a top dressing. JOURNAL OF APPLIED ANIMAL RESEARCH 2011. [DOI: 10.1080/09712119.2011.607759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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110
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Kobashi G, Hata A, Ohta K, Sugimori H, Okamoto K, Maekawa A. P1-456 A case-control study to detect genetic and acquired risk factors for paediatric inflammatory bowel disease. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976g.46] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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111
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Okamoto N, Morikawa M, Okamoto K, Iwamoto J, Tomioka K, Saeki K, Yanagi M, Amano N, Kurumatani N. P1-266 Relationship of tooth loss to mild memory impairment and cognitive impairment: findings from the Fujiwara-Kyo study. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976e.58] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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112
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Ando T, Nagai K, Chikada M, Okamoto K, Kurokawa M, Kobayashi T, Kato T, Makuuchi H. Proteomic analyses of aortic wall in patients with abdominal aortic aneurysm. THE JOURNAL OF CARDIOVASCULAR SURGERY 2011; 52:545-555. [PMID: 21792162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
AIM The mechanisms underlying the formation of abdominal aortic aneurysms have yet to be fully clarified. To identify key proteins generally involved in aneurysmal formation, proteomic profiles were compared between aneurysmal and non-aneurysmal regions of aortic walls from patients with abdominal aortic aneurysm. METHODS Aortic wall specimens were obtained from three patients with abdominal aortic aneurysm. Protein profiles of aortic wall samples including vascular media and adventitia were compared between aneurysmal and non-aneurysmal regions in each patient using two-dimensional fluorescence difference gel electrophoresis (2D-DIGE). Protein spots expressed differently between the two regions were identified by tandem mass spectrometry and verified by immunohistochemical investigations. RESULTS Image analysis of 2D-DIGE gels revealed 22 proteins spots expressed differently between aneurysmal and non-aneurysmal regions in all three patients. Among these, five protein spots that were up-regulated in the AA regions were successfully identified as complement component C4, fragments of the fibrinogen alpha or beta subunits, and actin. Immunohistochemical studies showed massive deposition of fibrin/fibrinogen or its fragments in the media, and complement C1q component, the molecule starting the classical complement pathway, in all three layers of the aneurysmal region. CONCLUSION Our proteomic and subsequent immunohistochemical studies revealed significant fibrinogenesis and fibrinolysis in the media, and activation of the classical complement pathway in all three layers of the aneurysmal region. These data promote understanding of mechanisms behind the formation of abdominal aortic aneurysms.
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113
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Ibrahim S, Fontaine NK, Djordjevic SS, Guan B, Su T, Cheung S, Scott RP, Pomerene AT, Seaford LL, Hill CM, Danziger S, Ding Z, Okamoto K, Yoo SJB. Demonstration of a fast-reconfigurable silicon CMOS optical lattice filter. OPTICS EXPRESS 2011; 19:13245-13256. [PMID: 21747479 DOI: 10.1364/oe.19.013245] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We demonstrate a fully-reconfigurable fourth-order optical lattice filter built by cascading identical unit cells consisting of a Mach-Zehnder interferometer (MZI) and a ring resonator. The filter is fabricated using a commercial silicon complementary metal oxide semiconductor (CMOS) process and reconfigured by current injection into p-i-n diodes with a reconfiguration time of less than 10 ns. The experimental results show full control over the single unit cell pole and zero, switching the unit cell transfer function between a notch filter and a bandpass filter, narrowing the notch width down to 400 MHz, and tuning the center wavelength over the full free spectral range (FSR) of 10 GHz. Theoretical and experimental results show tuning dynamics and associated optical losses in the reconfigurable filters. The full-control of each of the four cascaded single unit cells resulted in demonstrations of a number of fourth-order transfer functions. The multimedia experimental data show live tuning and reconfiguration of optical lattice filters.
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114
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Komatsu S, Ichikawa D, Takeshita H, Tsujiura M, Morimura R, Nagata H, Kosuga T, Iitaka D, Konishi H, Shiozaki A, Fujiwara H, Okamoto K, Otsuji E. Circulating microRNAs in plasma of patients with oesophageal squamous cell carcinoma. Br J Cancer 2011; 105:104-11. [PMID: 21673684 PMCID: PMC3137413 DOI: 10.1038/bjc.2011.198] [Citation(s) in RCA: 199] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Background: Several recent studies demonstrated that microRNAs (miRNAs) are stably detectable in plasma/serum. We hypothesised that plasma miRNAs concentrations contributed to potential biomarkers in patients with oesophageal squamous cell carcinoma (ESCC). Methods: We selected three oncogenic miRNAs (miR-21, miR-184, miR-221) and one tumour suppressive miRNA (miR-375), which are frequently reported in squamous cell carcinoma, as candidate targets for this plasma miRNA assay. This study was divided into three steps: (1) Determination of appropriate plasma miRNAs in preliminary tests. (2) Evaluation of whether the plasma miRNA assays could monitor tumour dynamics. (3) Validation study on the clinical application of plasma miRNA assays in 50 ESCC patients and 20 healthy volunteers. Results: (1) In preliminary tests, the plasma level of miR-21 was significantly higher (P=0.0218) and that of miR-375 (P=0.0052) was significantly lower in ESCC patients than controls. (2) The high plasma miR-21 levels reflected tumour levels in all cases (100%). The plasma level of miR-21 was significantly reduced in postoperative samples (P=0.0058). (3) On validation analysis, the plasma level of miR-21 tended to be higher in ESCC patients (P=0.0649), while that of miR-375 was significantly lower (P<0.0001) and the miR-21/miR-375 ratio was significantly higher (P<0.0001) in ESCC patients than in controls. The value of the area under the receiver-operating characteristic curve (AUC) was 0.816 for the miR-21/miR-375 ratio assay. Patients with a high plasma level of miR-21 tended to have greater vascular invasion (P=0.1554) and to show a high correlation with recurrence (P=0.0164). Conclusion: Detection of circulating miRNAs might provide new complementary tumour markers for ESCC.
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115
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Okamoto K, Sato K, Akiyoshi H. A study on the formation and trend of the Brewer-Dobson circulation. ACTA ACUST UNITED AC 2011. [DOI: 10.1029/2010jd014953] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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116
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Funahashi Y, Matsui J, Minoshima Y, Yokoi A, Abe T, Okamoto K, Takahashi K, Kadowaki T, Kuznetsov G, Agoulink S. The effect of E7080, a VEGFR and FGFR tyrosine kinase inhibitor (TKI), on BRAF wild-type melanoma. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.8566] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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117
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Matsuo K, Arito M, Noyori K, Nakamura H, Kurokawa MS, Masuko K, Okamoto K, Nagai K, Suematsu N, Yudoh K, Beppu M, Saito T, Kato T. Arthritogenicity of annexin VII revealed by phosphoproteomics of rheumatoid synoviocytes. Ann Rheum Dis 2011; 70:1489-95. [DOI: 10.1136/ard.2010.145524] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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118
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Bardoux R, Kaneta A, Funato M, Okamoto K, Kawakami Y, Kikuchi A, Kishino K. Single mode emission and non-stochastic laser system based on disordered point-sized structures: toward a tuneable random laser. OPTICS EXPRESS 2011; 19:9262-9268. [PMID: 21643181 DOI: 10.1364/oe.19.009262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
As an advantage, random lasers may be elaborated from a large variety of materials and do not require any cavity oscillators that usually necessitate complicated and expensive fabrication techniques. Since the feedback process of those non-conventional laser systems is provided by light interference in a disordered medium, spectral and temporal uncertainties are usually considered as an intrinsic part of their optical proprieties. We investigated random laser action under two photon absorption experiments through an auto-organized InGaN/GaN quantum-disks ensemble. Thanks to our experimental approach, we evidence random lasing based on a gain medium constituted by point-sized structures. In such context, a stabilised and individual emission mode is observed as for conventional semiconductor lasers. By controlling the emission energy of these nanostructures, a tuneable and stable random laser may be built. Moreover, our findings suggest that disordered medium should play an important role in the conception of low cost quantum dot and up conversion laser systems.
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119
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Fujiwara T, Iwamaru M, Tange M, Someya S, Okamoto K. A fractal-based 2D expansion method for multi-scale volume data visualization. J Vis (Tokyo) 2011. [DOI: 10.1007/s12650-011-0084-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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120
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Tochika N, Namikawa T, Kamiji I, Kitamura M, Okamoto K, Hanazaki K. Subcutaneous continuous suction drainage for prevention of surgical site infection. J Hosp Infect 2011; 78:67-8. [PMID: 21421275 DOI: 10.1016/j.jhin.2011.01.022] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2010] [Accepted: 01/19/2011] [Indexed: 02/05/2023]
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121
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Koyama JI, Iwashita T, Okamoto K. Reply letter to: Facilitating tracheal intubation using the Airtraq® laryngoscope during chest compression. Resuscitation 2011. [DOI: 10.1016/j.resuscitation.2010.11.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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122
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Yamada T, Goya M, Ooshima M, Okamoto K, Fujiwara S, Johno H, Murata T. P058 Aged Pacemaker Leads Need Extraction Tools for Lead Extraction. Int J Cardiol 2011. [DOI: 10.1016/s0167-5273(11)70084-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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123
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Miyazaki S, Yasaka T, Okamoto K, Shiba K, Sakamoto K, Hirose M. Structural Characterization of Porous Silicon Fabricated by Electrochemical and Chemical Dissolution of Si Wafers. ACTA ACUST UNITED AC 2011. [DOI: 10.1557/proc-256-185] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
ABSTRACTThe structure of porous silicon exhibiting efficient visible photoluminescence has been characterized by using Fourier transformed infrared absorption, Raman scattering and x-ray diffraction. It is shown that the lattice spacing in the porous Si layer expands by about 0.3% in the direction perpendicular to the surface and also a partially disordered structure is existing. Electron beam irradiation causes desorption of hydrogen and fluorine bonds which terminate the surface, resulting in the quenching of the visible luminescence. The chemical etching of such layer has led to complete recovery of the luminescence intensity as well as the hydrogen and fluorine bonds termination.
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124
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Takagi M, Uno S, Kokushi E, Shiga S, Mukai S, Kuriyagawa T, Takagaki K, Hasunuma H, Matsumoto D, Okamoto K, Shahada F, Chenga T, Deguchi E, Fink-Gremmels J. Measurement of urinary zearalenone concentrations for monitoring natural feed contamination in cattle herds: On-farm trials1. J Anim Sci 2011; 89:287-96. [DOI: 10.2527/jas.2010-3306] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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125
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Ito H, Morishita R, Shinoda T, Iwamoto I, Sudo K, Okamoto K, Nagata K. Dysbindin-1, a schizophrenia-related molecule, is involved in the regulation of neuronal dendritic development. Mol Psychiatry 2010; 15:969. [PMID: 20861847 DOI: 10.1038/mp.2010.93] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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