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Yang Y, Inoue G, Hosaka K, Tichy A, Ikeda M, Tagami J, Shimada Y. The Effect of a Deproteinizing Pretreatment on the Bonding Performance and Acid Resistance of a Two-step Self-etch Adhesive on Eroded Dentin. Oper Dent 2024; 49:65-75. [PMID: 38019217 DOI: 10.2341/23-005-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/02/2023] [Indexed: 11/30/2023]
Abstract
OBJECTIVES This study evaluated how deproteinization using sodium hypochlorite (6% NaOCl) or hypochlorous acid (50 ppm HOCl) with or without the subsequent use of an arylsulfinate salt-containing agent (Clearfil DC Activator; DCA; Kuraray Noritake Dental) affects the micro-tensile bond strength (μTBS) and formation of an acid-base resistant zone (ABRZ) of a two-step self-etch adhesive on eroded dentin. METHODS Coronal dentin surfaces of sound human molars were exposed to 48 cycles of demineralization (1% citric acid; 5 minutes) and remineralization (buffer solution with pH=6.4; 3.5 hours). They were then assigned to experimental groups according to the pretreatment used: none (negative control), NaOCl, NaOCl+DCA, HOCl, and HOCl+DCA. Sound dentin surfaces with no pretreatment were used as a positive control. The dentin surfaces were bonded with Clearfil SE Bond 2 (Kuraray Noritake Dental), and μTBS was measured either after 24 hours or 20,000 thermal cycles (TC). The μTBS data were statistically analyzed using a mixed-model analysis of variance (ANOVA) and t-tests with Bonferroni correction. Failure mode was determined with scanning electron microscopy (SEM), which was also used for the observation of ABRZ. RESULTS Among experimental groups, there was no significant difference between the negative control, HOCl, and HOCl+DCA after 24 hours, but the HOCl-pretreated groups exhibited significantly higher μTBS than the negative control after TC (p<0.01). Pretreatment with NaOCl and NaOCl+DCA resulted in significantly higher μTBS (p<0.001), but the highest μTBS was measured on sound dentin (p<0.001). TC decreased μTBS significantly in all groups (p<0.001) except for sound dentin and NaOCl+DCA (p>0.05). Adhesive failures prevailed in eroded groups, whereas cohesive failures were predominant on sound dentin. ABRZ was recognized in all groups but marked morphological differences were observed. CONCLUSIONS The combined use of 6% NaOCl and the arylsulfinate salt-containing agent partially reversed the compromised bonding performance on eroded dentin, while the effect of 50 ppm HOCl was negligible.
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Affiliation(s)
- Y Yang
- Yi Yang, DDS, PhD student, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - G Inoue
- *Go Inoue, DDS, PhD, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - K Hosaka
- Keiichi Hosaka, DDS, PhD, Department of Regenerative Dental Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - A Tichy
- Antonin Tichy, DDS, PhD, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan; Institute of Dental Medicine, First Faculty of Medicine of the Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - M Ikeda
- Masaomi Ikeda, DDS, PhD, Department of Oral Prosthetic Engineering, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - J Tagami
- Junji Tagami, DDS, PhD, Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Bangkok, Thailand
| | - Y Shimada
- Yasushi Shimada, DDS, PhD, Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
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Watanabe K, Tichy A, Kamoi K, Hiasa M, Yonekura K, Tanaka E, Nakajima M, Hosaka K. Restoration of a Microdont Using the Resin Composite Injection Technique With a Fully Digital Workflow: A Flexible 3D-printed Index With a Stabilization Holder. Oper Dent 2023; 48:483-489. [PMID: 37503684 DOI: 10.2341/23-007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/02/2023] [Indexed: 07/29/2023]
Abstract
Direct composite restorations are accepted as a treatment option for microdontia, which is a relatively prevalent condition that poses esthetic concerns. While free-hand composite placement is technique-sensitive and time-consuming, the resin composite injection technique is more straightforward and predictable. A fully digital workflow has been recently introduced, but the 3D-printed resin index is rigid and challenged by undercuts, as opposed to the silicone index. This case report presents a flexible 3D-printed resin index, which can accurately transfer the digitally simulated functional and esthetic form to the final restoration. In addition, a rigid stabilization holder was designed to stabilize the flexible index.
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Affiliation(s)
- K Watanabe
- Keiichiro Watanabe, DDS, PhD, Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - A Tichy
- Antonin Tichy, DDS, PhD, Institute of Dental Medicine, First Faculty of Medicine of the Charles University and General University Hospital in Prague, Prague, Czech Republic
| | - K Kamoi
- Kohei Kamoi, RDT, Department of Dental Laboratory, Tokushima University Hospital, Tokushima, Japan
| | - M Hiasa
- Masahiro Hiasa, DDS, PhD, Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - K Yonekura
- Kazuhide Yonekura, DDS, PhD, Department of Regenerative Dental Medicine, Tokushima University Graduate School of Biomedical Sciences, and Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
| | - E Tanaka
- Eiji Tanaka, DDS, PhD, Department of Orthodontics and Dentofacial Orthopedics, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - M Nakajima
- Masatoshi Nakajima, DDS, PhD, Department of Regenerative Dental Medicine, Tokushima University Graduate School of Biomedical Sciences, Tokushima, Japan
| | - K Hosaka
- *Keiichi Hosaka, DDS, PhD, Department of Regenerataive Dental Medicine Tokushima University Graduate School of Biomedical Sciences, and Institute of Post-LED Photonics, Tokushima University, Tokushima, Japan
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Kobayashi T, Takamizawa A, Akamatsu D, Kawasaki A, Nishiyama A, Hosaka K, Hisai Y, Wada M, Inaba H, Tanabe T, Yasuda M. Search for Ultralight Dark Matter from Long-Term Frequency Comparisons of Optical and Microwave Atomic Clocks. Phys Rev Lett 2022; 129:241301. [PMID: 36563281 DOI: 10.1103/physrevlett.129.241301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 10/05/2022] [Indexed: 06/17/2023]
Abstract
We search for ultralight scalar dark matter candidates that induce oscillations of the fine structure constant, the electron and quark masses, and the quantum chromodynamics energy scale with frequency comparison data between a ^{171}Yb optical lattice clock and a ^{133}Cs fountain microwave clock that span 298 days with an uptime of 15.4%. New limits on the couplings of the scalar dark matter to electrons and gluons in the mass range from 10^{-22} to 10^{-20} eV/c^{2} are set, assuming that each of these couplings is the dominant source of the modulation in the frequency ratio. The absolute frequency of the ^{171}Yb clock transition is also determined as 518 295 836 590 863.69(28) Hz, which is one of the important contributions toward a redefinition of the second in the International System of Units.
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Affiliation(s)
- Takumi Kobayashi
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Akifumi Takamizawa
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Daisuke Akamatsu
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
- Department of Physics, Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Akio Kawasaki
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Akiko Nishiyama
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Kazumoto Hosaka
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Yusuke Hisai
- Department of Physics, Graduate School of Engineering Science, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan
| | - Masato Wada
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Hajime Inaba
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Takehiko Tanabe
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
| | - Masami Yasuda
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan
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Hanisch R, Chalk S, Coulon R, Cox S, Emmerson S, Flamenco Sandoval FJ, Forbes A, Frey J, Hall B, Hartshorn R, Heus P, Hodson S, Hosaka K, Hutzschenreuter D, Kang CS, Picard S, White R. Stop squandering data: make units of measurement machine-readable. Nature 2022; 605:222-224. [PMID: 35538362 DOI: 10.1038/d41586-022-01233-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Davoodian N, Lebel T, Castellano MA, Hosaka K. Hysterangiales revisited: expanded phylogeny reveals new genera and two new suborders. Fungal Syst Evol 2022; 8:65-80. [PMID: 35005573 PMCID: PMC8687064 DOI: 10.3114/fuse.2021.08.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 07/09/2021] [Indexed: 11/08/2022] Open
Abstract
Hysterangiales (Phallomycetidae, Agaricomycetes, Basidiomycota) is a diverse, nearly cosmopolitan order of predominantly hypogeous, sequestrate, ectomycorrhizal fungi. Expanding on previously published phylogenies, we significantly increased sampling of Hysterangiales specimens, emphasizing representatives from Australia. Using protein-coding genes atp6 (adenosine triphosphate synthase subunit 6) and tef1 (translation elongation factor 1-á), we recovered 26 provisional novel genera, and corroborated existing genera and families. Further, two new suborders (Phallogastrineae subord. nov. and Hysterangineae subord. nov.) and a new family (Phallogastraceae fam. nov.) are described, and three new combinations made to Phallogaster. Aspects of classification and biogeography are presented.
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Affiliation(s)
- N Davoodian
- Royal Botanic Gardens Victoria, South Yarra, VIC 3141, Australia
| | - T Lebel
- Royal Botanic Gardens Victoria, South Yarra, VIC 3141, Australia.,Botanic Gardens and State Herbarium of South Australia, Adelaide, SA 5001, Australia; Royal Botanic Gardens Victoria, South Yarra, VIC 3141, Australia
| | - M A Castellano
- US Department of Agriculture Forest Service, Northern Research Station, Corvallis, OR 97331, USA
| | - K Hosaka
- National Museum of Nature and Science, Tsukuba, Ibaraki 305-0005, Japan (ORCID: 0000-0002-4469-8303)
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Sanon K, Hatayam T, Hosaka K, Nakajima M. Effect of Zinc Chloride on HOCl-Smear Layer Deproteinization. Dent Mater 2022. [DOI: 10.1016/j.dental.2021.12.091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Zimmer R, Leite ML, de Souza Costa CA, Hebling J, Anovazzi G, Klein CA, Hosaka K, Reston ED. Effect of Time and Temperature of Air Jet on the Mechanical and Biological Behavior of a Universal Adhesive System. Oper Dent 2021; 47:87-96. [PMID: 34624102 DOI: 10.2341/20-038-l] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/05/2021] [Indexed: 11/23/2022]
Abstract
OBJECTIVES To evaluate the influence of heat application on the degree of conversion (DC) of the 3M Single Bond Universal Adhesive System, as well as its transdentinal cytotoxicity and microtensile bond strength to dentin. METHODS Experimental groups were established according to the time and temperature of the air jet: G1: 5 seconds-25°C; G2: 10 seconds-25°C; G3: 20 seconds-25°C; G4: 5 seconds-50°C; G5: 10 seconds-50°C; G6: 20 seconds-50°C. In control group (G7), no treatment was performed. The DC was assessed using the Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) technique. For the transdentinal cytotoxicity test, dentin discs fitted in artificial pulp chambers (APC) received the application of the adhesive system and the air jets. For the microtensile bond strength, healthy molars were restored and submitted to the microtensile test after 24 hours and 6 months, respectively. RESULTS Significant reduction in viability of Mouse Dental Papilla Cell-23 (MDPC-23), which exhibited morphological changes, was observed in all experimental groups compared to control (p<0.05). Although all tested protocols resulted in transdentinal diffusion of 2-hydroxyethyl methacrylate (HEMA), the group G6 presented the highest degree of monomeric conversion and the lowest cytotoxic effect, with higher dentin bond strength values in comparison to group G1 (p<0.05). CONCLUSIONS Applying an air blast at 50°C for 20 seconds increases the DC and microtensile bond strength of the 3M Single Bond Universal Adhesive System to dentin, as well as reduces the transdentinal cytotoxicity of the material to pulp cells.
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Affiliation(s)
- R Zimmer
- Roberto Zimmer, DDS, MS, Department of Operative Dentistry, School of Dentistry, Lutheran University of Brazil (Ulbra), Canoas, Brazil
| | - M L Leite
- Maria Luisa Leite, DDS, MS, PhD, Department of Physiology and Pathology, Araraquara School of Dentistry, São Paulo State University (Unesp), Araraquara, Brazil
| | - C A de Souza Costa
- Carlos Alberto de Souza Costa, DDS, MS, PhD, Department of Physiology and Pathology, Araraquara School of Dentistry, São Paulo State University (Unesp), Araraquara, Brazil
| | - J Hebling
- Josimeri Hebling, DDS, MS, PhD, Department of Orthodontics and Pediatric Dentistry, Araraquara School of Dentistry, São Paulo State University (Unesp), Araraquara, Brazil
| | - G Anovazzi
- Giovana Anovazzi, DDS, MS, PhD, Department of Orthodontics and Pediatric Dentistry, Araraquara School of Dentistry, São Paulo State University (Unesp), Araraquara, Brazil
| | - C A Klein
- Celso Afonso Klein-Junior, DDS, MS, PhD, Department of Operative Dentistry, School of Dentistry, Lutheran University of Brazil (Ulbra), Canoas, Brazil
| | - K Hosaka
- Keiichi Hosaka, DDS, MS, PhD, Department of Cariology and Operative Dentistry,Graduate School of Medical and Dental Sciences,Tokyo Medical and Dental University, Tokyo, Japan
| | - E D Reston
- *Eduardo Galia Reston, DDS, MSD, PhD, Department of Operative Dentistry, School of Dentistry, Lutheran University of Brazil (Ulbra), Canoas, Brazil
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Tichy A, Hosaka K, Abdou A, Nakajima M, Tagami J. Degree of Conversion Contributes to Dentin Bonding Durability of Contemporary Universal Adhesives. Oper Dent 2020; 45:556-566. [DOI: 10.2341/19-165-l] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/27/2019] [Indexed: 11/23/2022]
Abstract
Clinical Relevance
The degree of conversion of contemporary universal adhesives positively correlates with the bond strength to dentin. The correlation is more marked after thermocycling, suggesting that a high degree of conversion is required for long-term dentin bonding durability.
SUMMARY
Purpose: The objectives of this study were to evaluate the micro-tensile bond strength (μTBS) of five contemporary universal adhesives to dentin after 24 hours and thermocycling (TC), to measure their degrees of conversion (DC) and to test the correlation between μTBS and DC.
Methods and Materials: Four commercially available universal adhesives, Prime&Bond universal (PBU), Ecosite Bond (EB), G-Premio Bond (GPB), and Clearfil Universal Bond Quick (UBQ), and one experimental adhesive, UBQ without an amide monomer (UBQ-A), were used in this study. For the μTBS test, midcoronal dentin of 50 human molars was exposed, ground using 600-grit SiC paper, and the adhesives were applied according to the manufacturers’ instructions. After resin-composite buildup and 24-hour water storage, one-half of the specimens were subjected to 15,000 thermal cycles. The specimens were sectioned into beams and stressed in tension at a crosshead speed of 1 mm/min until failure. The DC of adhesives applied to dentin was evaluated using attenuated total reflectance Fourier-transform infrared spectroscopy immediately after light-curing. All data were statistically analyzed at a significance level of 0.05.
Results: The highest μTBSs were obtained with UBQ, UBQ-A, and PBU, which were not significantly different from each other both after 24 hours and TC. The μTBS of GPB was lower compared with the aforementioned adhesives, but significantly only after TC, and the lowest μTBSs were obtained with EB. TC did not affect the μTBSs of UBQ, UBQ-A, and PBU significantly, but a significant decrease was observed with GPB and EB. The highest DC was obtained with PBU and UBQ, followed by 2-hydroxyethyl methacrylate–rich adhesives UBQ-A and EB, which exhibited significantly lower DCs. The DC of GPB could not be determined because the reference peak at 1608 cm−1 was not detected in its spectra. A significant positive correlation was shown between μTBS and DC after 24 hours (r=0.716) and TC (r=0.856).
Conclusion: μTBS and DC were positively correlated, more markedly after TC, which suggests that DC may be an important factor for bond durability.
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Hisai Y, Akamatsu D, Kobayashi T, Okubo S, Inaba H, Hosaka K, Yasuda M, Hong FL. Development of 8-branch Er:fiber frequency comb for Sr and Yb optical lattice clocks. Opt Express 2019; 27:6404-6414. [PMID: 30876226 DOI: 10.1364/oe.27.006404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Accepted: 02/12/2019] [Indexed: 06/09/2023]
Abstract
We demonstrate an 8-branch Er:fiber frequency comb with seven application ports, which can be individually optimized for applications with different wavelengths. The beat between the comb and a cw laser has a signal-to-noise ratio exceeding 30 dB at a resolution bandwidth of 300 kHz. The 8-branch frequency comb is used to perform frequency locking for four repumping and lattice lasers, and the frequency measurement of two clock lasers of strontium and ytterbium optical lattice clocks. We have achieved reliable optical lattice clock operation, thanks to the stable frequency locking and measurement obtained by using the 8-branch frequency comb. The developed frequency comb is a powerful experimental tool for various applications, including not only optical lattice clocks, but also research on quantum optics that use many frequency-stabilized lasers.
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Kobayashi T, Akamatsu D, Hisai Y, Tanabe T, Inaba H, Suzuyama T, Hong FL, Hosaka K, Yasuda M. Uncertainty Evaluation of an 171Yb Optical Lattice Clock at NMIJ. IEEE Trans Ultrason Ferroelectr Freq Control 2018; 65:2449-2458. [PMID: 30235125 DOI: 10.1109/tuffc.2018.2870937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report an uncertainty evaluation of an 171Yb optical lattice clock with a total fractional uncertainty of 3.6×10-16 , which is mainly limited by the lattice-induced light shift and the blackbody radiation shift. Our evaluation of the lattice-induced light shift, the density shift, and the second-order Zeeman shift is based on an interleaved measurement where we measure the frequency shift using the alternating stabilization of a clock laser to the 6s2 1S0-6s6p 3P0 clock transition with two different experimental parameters. In the present evaluation, the uncertainties of two sensitivity coefficients for the lattice-induced hyperpolarizability shift d incorporated in a widely used light shift model by RIKEN and the second-order Zeeman shift aZ are improved compared with the uncertainties of previous coefficients. The hyperpolarizability coefficient d is determined by investigating the trap potential depth and the light shifts at the lattice frequencies near the two-photon transitions 6s6p3P0-6s8p3P0, 6s8p3P2, and 6s5f3F2. The obtained values are d=-1.1(4) μ Hz and aZ=-6.6(3) Hz/mT2. These improved coefficients should reduce the total systematic uncertainties of Yb lattice clocks at other institutes.
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Akamatsu D, Kobayashi T, Hisai Y, Tanabe T, Hosaka K, Yasuda M, Hong FL. Dual-Mode Operation of an Optical Lattice Clock Using Strontium and Ytterbium Atoms. IEEE Trans Ultrason Ferroelectr Freq Control 2018; 65:1069-1075. [PMID: 29856725 DOI: 10.1109/tuffc.2018.2819888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We have developed an optical lattice clock that can operate in dual modes: a strontium (Sr) clock mode and an ytterbium (Yb) clock mode. Dual-mode operation of the Sr-Yb optical lattice clock is achieved by alternately cooling and trapping 87Sr and 171Yb atoms inside the vacuum chamber of the clock. Optical lattices for Sr and Yb atoms were arranged with horizontal and vertical configurations, respectively, resulting in a small distance of the order of between the trapped Sr and Yb atoms. The 1S0-3P0 clock transitions in the trapped atoms were interrogated in turn and the clock lasers were stabilized to the transitions. We demonstrated the frequency ratio measurement of the Sr and Yb clock transitions by using the dual-mode operation of the Sr-Yb optical lattice clock. The dual-mode operation can reduce the uncertainty of the blackbody radiation shift in the frequency ratio measurement, because both Sr and Yb atoms share the same blackbody radiation.
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Fazal ZH, Hosaka K, Manfredsson FP, Hoh BL. Introducing a Novel Method of Intravascular Adeno-associated Virus-mediated Gene Delivery. Virology (Hyderabad) 2018; 2:105. [PMID: 30498814 PMCID: PMC6258074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
INTRODUCTION Adeno-associated virus (AAV) has shown therapeutic potential as a viral vector in various studies of gene therapy. However, research on its use in targeting intravascular cells in a localized manner is lacking. We introduce a novel method to deliver various AAV serotypes intravascularly and examine their efficiency in transducing cells of the murine carotid artery. OBJECTIVE The study aimed to examine the transduction efficiency of AAV-mediated gene delivery in cells of the murine carotid artery both with and without a fully-formed aneurysm. Results of infection were visualized with green fluorescence protein (GFP) reporter gene. METHODS Naïve murine carotid artery or experimentally-induced murine carotid aneurysm was ligated distally and proximally. A small incision was made and 5 uL AAV2, AAV5, AAV8, or AAV9 was microsurgically injected and allowed to incubate for 30 min. Incision was closed and tissue was excised three weeks following AAV injection. Carotid artery or aneurysm tissue was excised and fixed in 4% paraformaldehyde solution. On both naïve carotid artery tissue and aneurysm tissue, GFP was visualized by immunofluorescence using antibody against GFP. RESULTS Three out of four serotypes of AAV successfully transduced cells within both the murine aneurysm tissue and the naïve carotid artery tissue. AAV5- and AAV9-transduced aneurysm tissue showed the greatest presence of GFP, with AAV8 showing less overall fluorescence. AAV2 showed no fluorescence. CONCLUSION AAV-mediated gene delivery is an effective way to transduce cells intravascularly with a transgene of interest. Our method can be generalized across a wide variety of studies to further research or treat other vascular disease.
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Affiliation(s)
- ZH Fazal
- Department of Neurosurgery, University of Florida, Gainesville, FL 32610, USA,Corresponding author: Fazal ZH, Department of Neurosurgery, University of Florida, Gainesville, FL 32610, USA, Tel: +352-273-7417; Fax: 352-392-8413
| | - K Hosaka
- Department of Neurosurgery, University of Florida, Gainesville, FL 32610, USA
| | - FP Manfredsson
- Department of Translational Science and Molecular Medicine, College of Human Medicine, Michigan State University, Grand Rapids, MI, USA
| | - BL Hoh
- Department of Neurosurgery, University of Florida, Gainesville, FL 32610, USA
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Crous P, Wingfield M, Burgess T, Hardy G, Barber P, Alvarado P, Barnes C, Buchanan P, Heykoop M, Moreno G, Thangavel R, van der Spuy S, Barili A, Barrett S, Cacciola S, Cano-Lira J, Crane C, Decock C, Gibertoni T, Guarro J, Guevara-Suarez M, Hubka V, Kolařík M, Lira C, Ordoñez M, Padamsee M, Ryvarden L, Soares A, Stchigel A, Sutton D, Vizzini A, Weir B, Acharya K, Aloi F, Baseia I, Blanchette R, Bordallo J, Bratek Z, Butler T, Cano-Canals J, Carlavilla J, Chander J, Cheewangkoon R, Cruz R, da Silva M, Dutta A, Ercole E, Escobio V, Esteve-Raventós F, Flores J, Gené J, Góis J, Haines L, Held B, Jung MH, Hosaka K, Jung T, Jurjević Ž, Kautman V, Kautmanova I, Kiyashko A, Kozanek M, Kubátová A, Lafourcade M, La Spada F, Latha K, Madrid H, Malysheva E, Manimohan P, Manjón J, Martín M, Mata M, Merényi Z, Morte A, Nagy I, Normand AC, Paloi S, Pattison N, Pawłowska J, Pereira O, Petterson M, Picillo B, Raj K, Roberts A, Rodríguez A, Rodríguez-Campo F, Romański M, Ruszkiewicz-Michalska M, Scanu B, Schena L, Semelbauer M, Sharma R, Shouche Y, Silva V, Staniaszek-Kik M, Stielow J, Tapia C, Taylor P, Toome-Heller M, Vabeikhokhei J, van Diepeningen A, Van Hoa N, M. VT, Wiederhold N, Wrzosek M, Zothanzama J, Groenewald J. Fungal Planet description sheets: 558-624. Persoonia 2017; 38:240-384. [PMID: 29151634 PMCID: PMC5645186 DOI: 10.3767/003158517x698941] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Accepted: 05/01/2017] [Indexed: 01/20/2023]
Abstract
Novel species of fungi described in this study include those from various countries as follows: Australia: Banksiophoma australiensis (incl. Banksiophoma gen. nov.) on Banksia coccinea, Davidiellomycesaustraliensis (incl. Davidiellomyces gen. nov.) on Cyperaceae, Didymocyrtis banksiae on Banksia sessilis var. cygnorum, Disculoides calophyllae on Corymbia calophylla, Harknessia banksiae on Banksia sessilis, Harknessia banksiae-repens on Banksia repens, Harknessia banksiigena on Banksia sessilis var. cygnorum, Harknessia communis on Podocarpus sp., Harknessia platyphyllae on Eucalyptus platyphylla, Myrtacremonium eucalypti (incl. Myrtacremonium gen. nov.) on Eucalyptus globulus, Myrtapenidiella balenae on Eucalyptus sp., Myrtapenidiella eucalyptigena on Eucalyptus sp., Myrtapenidiella pleurocarpae on Eucalyptuspleurocarpa, Paraconiothyrium hakeae on Hakea sp., Paraphaeosphaeria xanthorrhoeae on Xanthorrhoea sp., Parateratosphaeria stirlingiae on Stirlingia sp., Perthomyces podocarpi (incl. Perthomyces gen. nov.) on Podocarpus sp., Readeriella ellipsoidea on Eucalyptus sp., Rosellinia australiensis on Banksia grandis, Tiarosporella corymbiae on Corymbia calophylla, Verrucoconiothyriumeucalyptigenum on Eucalyptus sp., Zasmidium commune on Xanthorrhoea sp., and Zasmidium podocarpi on Podocarpus sp. Brazil: Cyathus aurantogriseocarpus on decaying wood, Perenniporia brasiliensis on decayed wood, Perenniporia paraguyanensis on decayed wood, and Pseudocercospora leandrae-fragilis on Leandrafragilis.Chile: Phialocephala cladophialophoroides on human toe nail. Costa Rica: Psathyrella striatoannulata from soil. Czech Republic: Myotisia cremea (incl. Myotisia gen. nov.) on bat droppings. Ecuador: Humidicutis dictiocephala from soil, Hygrocybe macrosiparia from soil, Hygrocybe sangayensis from soil, and Polycephalomyces onorei on stem of Etlingera sp. France: Westerdykella centenaria from soil. Hungary: Tuber magentipunctatum from soil. India: Ganoderma mizoramense on decaying wood, Hodophilus indicus from soil, Keratinophyton turgidum in soil, and Russula arunii on Pterigota alata.Italy: Rhodocybe matesina from soil. Malaysia: Apoharknessia eucalyptorum, Harknessia malayensis, Harknessia pellitae, and Peyronellaea eucalypti on Eucalyptus pellita, Lectera capsici on Capsicum annuum, and Wallrothiella gmelinae on Gmelina arborea.Morocco: Neocordana musigena on Musa sp. New Zealand: Candida rongomai-pounamu on agaric mushroom surface, Candida vespimorsuum on cup fungus surface, Cylindrocladiella vitis on Vitis vinifera, Foliocryphia eucalyptorum on Eucalyptus sp., Ramularia vacciniicola on Vaccinium sp., and Rhodotorula ngohengohe on bird feather surface. Poland: Tolypocladium fumosum on a caterpillar case of unidentified Lepidoptera.Russia: Pholiotina longistipitata among moss. Spain: Coprinopsis pseudomarcescibilis from soil, Eremiomyces innocentii from soil, Gyroporus pseudocyanescens in humus, Inocybe parvicystis in humus, and Penicillium parvofructum from soil. Unknown origin: Paraphoma rhaphiolepidis on Rhaphiolepsis indica.USA: Acidiella americana from wall of a cooling tower, Neodactylaria obpyriformis (incl. Neodactylaria gen. nov.) from human bronchoalveolar lavage, and Saksenaea loutrophoriformis from human eye. Vietnam: Phytophthora mekongensis from Citrus grandis, and Phytophthora prodigiosa from Citrus grandis. Morphological and culture characteristics along with DNA barcodes are provided.
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Affiliation(s)
- P.W. Crous
- Westerdijk Fungal Biodiversity Institute, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
| | - M.J. Wingfield
- Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria 0002, South Africa
| | - T.I. Burgess
- Centre for Phytophthora Science and Management, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - G.E.St.J. Hardy
- Centre for Phytophthora Science and Management, Murdoch University, 90 South Street, Murdoch, WA 6150, Australia
| | - P.A. Barber
- ArborCarbon, P.O. Box 1065, Willagee Central, WA 6156, Australia; 1 City Farm Place, East Perth, Western Australia, 6004 Australia
| | - P. Alvarado
- ALVALAB, C/ La Rochela nº 47, E-39012 Santander, Spain
| | - C.W. Barnes
- Instituto Nacional de Investigaciones Agropecuarias, Estación Experimental Santa Catalina, Panamericana Sur Km1, Sector Cutuglahua, Pichincha, Ecuador
| | - P.K. Buchanan
- Landcare Research, Private Bag 92170, Auckland 1142, New Zealand
| | - M. Heykoop
- Departamento de Ciencias de la Vida (Área de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - G. Moreno
- Departamento de Ciencias de la Vida (Área de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - R. Thangavel
- Plant Health and Environment Laboratory, Ministry for Primary Industries, P.O. Box 2095, Auckland 1140, New Zealand
| | - S. van der Spuy
- Macleans College, 2 Macleans Rd, Bucklands Beach, Auckland 2014, New Zealand
| | - A. Barili
- Escuela de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Av. 12 de octubre 1076 y Roca, Quito, Ecuador
| | - S. Barrett
- Department of Parks and Wildlife Albany District, 120 Albany Highway, Albany, WA 6330, Australia
| | - S.O. Cacciola
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Santa Sofia 100, 95123 Catania, Italy
| | - J.F. Cano-Lira
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - C. Crane
- Department of Parks and Wildlife, Vegetation Health Service, Locked Bag 104, Bentley Delivery Centre, Bentley, WA 6983, Australia
| | - C. Decock
- Mycothèque de l’Université catholique de Louvain (MUCL, BCCMTM), Earth and Life Institute – Microbiology (ELIM), Université catholique de Louvain, Croix du Sud 2 bte L7.05.06, B-1348, Louvain-la-Neuve, Belgium
| | - T.B. Gibertoni
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - J. Guarro
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - M. Guevara-Suarez
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - V. Hubka
- Department of Botany, Faculty of Science, Charles University, Benátská 2, 128 01 Prague 2, Czech Republic
| | - M. Kolařík
- Laboratory of Fungal Genetics and Metabolism, Institute of Microbiology of the CAS, v.v.i, Vídeňská 1083, 142 20 Prague 4, Czech Republic
| | - C.R.S. Lira
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - M.E. Ordoñez
- Escuela de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Av. 12 de octubre 1076 y Roca, Quito, Ecuador
| | - M. Padamsee
- Landcare Research, Private Bag 92170, Auckland 1142, New Zealand
| | - L. Ryvarden
- University of Oslo, Institute of Biological Sciences, P.O. Box 1066, Blindern, N-0316, Oslo, Norway
| | - A.M. Soares
- Departamento de Micologia Prof. Chaves Batista, Universidade Federal de Pernambuco, Recife, Brazil
| | - A.M. Stchigel
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - D.A. Sutton
- Fungus Testing Laboratory, Department of Pathology, University of Texas Health Science Center, San Antonio, Texas, USA
| | - A. Vizzini
- Department of Life Sciences and Systems Biology, University of Torino, Viale P.A. Mattioli 25, I-10125 Torino, Italy; Institute for Sustainable Plant Protection (IPSP)-CNR, Viale P.A. Mattioli 25, I-10125 Torino, Italy
| | - B.S. Weir
- Landcare Research, Private Bag 92170, Auckland 1142, New Zealand
| | - K. Acharya
- Molecular and Applied Mycology and Plant Pathology Laboratory, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - F. Aloi
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Santa Sofia 100, 95123 Catania, Italy
| | - I.G. Baseia
- Departamento de Botânica e Zoologia, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - R.A. Blanchette
- University of Minnesota, 495 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108, USA
| | - J.J. Bordallo
- Departamento de Biología Vegetal (Botánica), Facultad de Biología, Universidad de Murcia, 30100 Murcia, Spain
| | - Z. Bratek
- Department of Plant Physiology and Molecular Plant Biology, Eötvös Loránd University, Pázmány Péter lane 1/C, Budapest H-1117, Hungary
| | - T. Butler
- Te Kura Kaupapa Māori o Kaikohe, 20 Hongi Street, Kaikohe 0405, New Zealand
| | - J. Cano-Canals
- Te Kura Kaupapa Māori o Kaikohe, 20 Hongi Street, Kaikohe 0405, New Zealand
| | - J.R. Carlavilla
- Departamento de Ciencias de la Vida (Área de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - J. Chander
- Department of Microbiology, Government Medical College Hospital, 32B, Sector 32, Chandigarh, 160030, India
| | - R. Cheewangkoon
- Department of Entomology and Plant Pathology, Faculty of Agriculture, Chiang Mai University, Chiang Mai 50200, Thailand
| | - R.H.S.F. Cruz
- Programa de Pós-graduação em Sistemática e Evolução, Dept. Botânica e Zoologia, Centro de Biociências, Universidade Federal do Rio Grande do Norte, Natal, 59078-970, Brazil
| | - M. da Silva
- Universidade Federal de Viçosa, Minas Gerais, Brazil
| | - A.K. Dutta
- Molecular and Applied Mycology and Plant Pathology Laboratory, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - E. Ercole
- Department of Life Sciences and Systems Biology, University of Turin, I-10125 Turin, Italy
| | - V. Escobio
- Sociedad Micológica de Gran Canaria, Apartado 609, 35080 Las Palmas de Gran Canaria, Spain
| | - F. Esteve-Raventós
- Departamento de Ciencias de la Vida (Área de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - J.A. Flores
- Escuela de Ciencias Biológicas, Pontificia Universidad Católica del Ecuador, Av. 12 de octubre 1076 y Roca, Quito, Ecuador
| | - J. Gené
- Mycology Unit, Medical School and IISPV, Universitat Rovira i Virgili (URV), Sant Llorenç 21, 43201 Reus, Tarragona, Spain
| | - J.S. Góis
- Departamento de Botânica e Zoologia, Universidade Federal do Rio Grande do Norte, Natal, Rio Grande do Norte, Brazil
| | - L. Haines
- Te Kura Kaupapa Māori o Kaikohe, 20 Hongi Street, Kaikohe 0405, New Zealand
| | - B.W. Held
- University of Minnesota, 495 Borlaug Hall, 1991 Upper Buford Circle, St. Paul, MN 55108, USA
| | - M. Horta Jung
- Phytophthora Research Center, Mendel University, Zemedelska 1, 613 00 Brno, Czech Republic; Phytophthora Research and Consultancy, Am Rain 9, 83131 Nußdorf, Germany
| | - K. Hosaka
- Department of Botany, National Museum of Nature and Science-TNS, 4-1-1 Amakubo, Tsukuba, Ibaraki, 305-0005, Japan
| | - T. Jung
- Phytophthora Research Center, Mendel University, Zemedelska 1, 613 00 Brno, Czech Republic; Phytophthora Research and Consultancy, Am Rain 9, 83131 Nußdorf, Germany
| | - Ž. Jurjević
- EMSL Analytical, Inc., 200 Route 130 North, Cinnaminson, NJ 08077, USA
| | | | - I. Kautmanova
- Slovak National Museum-Natural History Museum, Vajanskeho nab. 2, P.O. Box 13, 81006 Bratislava, Slovakia
| | - A.A. Kiyashko
- Komarov Botanical Institute of the Russian Academy of Sciences, Saint Petersburg, Russia
| | - M. Kozanek
- Scientica, Ltd., Hybesova 33, 83106 Bratislava, Slovakia
| | - A. Kubátová
- Department of Botany, Faculty of Science, Charles University, Benátská 2, 128 01 Prague 2, Czech Republic
| | - M. Lafourcade
- Laboratorio Clínico, Clínica Santa María, Santiago, Chile
| | - F. La Spada
- Department of Agriculture, Food and Environment (Di3A), University of Catania, Via Santa Sofia 100, 95123 Catania, Italy
| | - K.P.D. Latha
- Department of Botany, University of Calicut, Kerala, 673 635, India
| | - H. Madrid
- Centro de Genómica y Bioinformática, Facultad de Ciencias, Universidad Mayor de Chile, Camino La Pirámide 5750, Huechuraba, Santiago, Chile
| | - E.F. Malysheva
- Komarov Botanical Institute of the Russian Academy of Sciences, Saint Petersburg, Russia
| | - P. Manimohan
- Department of Botany, University of Calicut, Kerala, 673 635, India
| | - J.L. Manjón
- Departamento de Ciencias de la Vida (Área de Botánica), Universidad de Alcalá, E-28805 Alcalá de Henares, Madrid, Spain
| | - M.P. Martín
- Departamento de Micología, Real Jardín Botánico-CSIC, Plaza de Murillo 2, 28014 Madrid, Spain
| | - M. Mata
- Escuela de Biología, Universidad de Costa Rica, Sede Central, San Pedro de Montes Oca. San José, Costa Rica
| | - Z. Merényi
- Department of Plant Physiology and Molecular Plant Biology, Eötvös Loránd University, Pázmány Péter lane 1/C, Budapest H-1117, Hungary
| | - A. Morte
- Departamento de Biología Vegetal (Botánica), Facultad de Biología, Universidad de Murcia, 30100 Murcia, Spain
| | - I. Nagy
- Department of Plant Physiology and Molecular Plant Biology, Eötvös Loránd University, Pázmány Péter lane 1/C, Budapest H-1117, Hungary
| | - A.-C. Normand
- Département de Parasitologie/Mycologie La Timone, Marseille, France
| | - S. Paloi
- Molecular and Applied Mycology and Plant Pathology Laboratory, Department of Botany, University of Calcutta, 35, Ballygunge Circular Road, Kolkata-700019, West Bengal, India
| | - N. Pattison
- Rongomai School, 20 Rongomai Rd, Otara, Auckland 2023, New Zealand
| | - J. Pawłowska
- Department of Molecular Phylogenetics and Evolution, University of Warsaw, Żwirki and Wigury 101, PL-02-089 Warsaw, Poland
| | - O.L. Pereira
- Universidade Federal de Viçosa, Minas Gerais, Brazil
| | - M.E. Petterson
- Landcare Research, Private Bag 92170, Auckland 1142, New Zealand
| | - B. Picillo
- Via Roma 139, I-81017 Sant’ Angelo d’ Alife (CE), Italy
| | - K.N.A. Raj
- Department of Botany, University of Calicut, Kerala, 673 635, India
| | - A. Roberts
- Karamu High School, Windsor Ave, Parkvale, Hastings 4122, New Zealand
| | - A. Rodríguez
- Departamento de Biología Vegetal (Botánica), Facultad de Biología, Universidad de Murcia, 30100 Murcia, Spain
| | | | - M. Romański
- Wigry National Park, Krzywe 82, PL-16-402 Suwałki, Poland
| | | | - B. Scanu
- Dipartimento di Agraria, University of Sassari, Viale Italia 39, 07100 Sassari, Italy
| | - L. Schena
- Dipartimento di Agraria, Mediterranean University of Reggio Calabria, Feo di Vito, 89122 Reggio Calabria, Italy
| | - M. Semelbauer
- Institute of Zoology, Slovak Academy of Sciences, Dubravska cesta 9, 84506 Bratislava, Slovakia
| | - R. Sharma
- National Centre for Microbial Resource, National Centre for Cell Science, NCCS Complex SP Pune University Campus, Ganeshkhind, Pune 411007, India
| | - Y.S. Shouche
- National Centre for Microbial Resource, National Centre for Cell Science, NCCS Complex SP Pune University Campus, Ganeshkhind, Pune 411007, India
| | - V. Silva
- Escuela de Tecnología Médica, Facultad de Ciencias, Universidad Mayor de Chile, Santiago, Chile
| | - M. Staniaszek-Kik
- Department of Geobotany and Plant Ecology, University of Łódź, Banacha 12/16, PL-90-237 Łódź, Poland
| | - J.B. Stielow
- Westerdijk Fungal Biodiversity Institute, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
| | - C. Tapia
- Laboratorio de Micología Médica, Programa de Microbiología y Micología, Instituto de Ciencias Biomédicas, Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - P.W.J. Taylor
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Australia
| | - M. Toome-Heller
- Plant Health and Environment Laboratory, Ministry for Primary Industries, P.O. Box 2095, Auckland 1140, New Zealand
| | | | - A.D. van Diepeningen
- Westerdijk Fungal Biodiversity Institute, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
| | - N. Van Hoa
- Southern Horticultural Research Institute, My Tho, Tien Giang, Vietnam
| | - Van Tri M.
- Southern Horticultural Research Institute, My Tho, Tien Giang, Vietnam
| | - N.P. Wiederhold
- Fungus Testing Laboratory, Department of Pathology, University of Texas Health Science Center, San Antonio, Texas, USA
| | - M. Wrzosek
- Department of Molecular Phylogenetics and Evolution, University of Warsaw, Żwirki and Wigury 101, PL-02-089 Warsaw, Poland
| | | | - J.Z. Groenewald
- Westerdijk Fungal Biodiversity Institute, P.O. Box 85167, 3508 AD Utrecht, The Netherlands
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Kobayashi T, Akamatsu D, Nishida Y, Tanabe T, Yasuda M, Hong FL, Hosaka K. Second harmonic generation at 399 nm resonant on the 1S 0- 1P1 transition of ytterbium using a periodically poled LiNbO 3 waveguide. Opt Express 2016; 24:12142-12150. [PMID: 27410134 DOI: 10.1364/oe.24.012142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We demonstrate a compact and robust method for generating a 399-nm light resonant on the 1S0 - 1P1 transition in ytterbium using a single-pass periodically poled LiNbO3 waveguide for second harmonic generation (SHG). The obtained output power at 399 nm was 25 mW when a 798-nm fundamental power of 380 mW was coupled to the waveguide. We observed no degradation of the SHG power for 13 hours with a low power of 6 mW. The obtained SHG light has been used as a seed light for injection locking, which provides sufficient power for laser cooling ytterbium.
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Kobayashi T, Akamatsu D, Hosaka K, Inaba H, Okubo S, Tanabe T, Yasuda M, Onae A, Hong FL. Compact iodine-stabilized laser operating at 531 nm with stability at the 10(-12) level and using a coin-sized laser module. Opt Express 2015; 23:20749-20759. [PMID: 26367927 DOI: 10.1364/oe.23.020749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We demonstrate a compact iodine-stabilized laser operating at 531 nm using a coin-sized light source consisting of a 1062-nm distributed-feedback diode laser and a frequency-doubling element. A hyperfine transition of molecular iodine is observed using the light source with saturated absorption spectroscopy. The light source is frequency stabilized to the observed iodine transition and achieves frequency stability at the 10(-12) level. The absolute frequency of the compact laser stabilized to the a(1) hyperfine component of the R(36)32 - 0 transition is determined as 564074632419(8) kHz with a relative uncertainty of 1.4×10(-11). The iodine-stabilized laser can be used for various applications including interferometric measurements.
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Hatayama T, Nakajima M, Hosaka K, Kainose K, Wakabayashi N, Tagami J. Stress distribution in resin-core build-up tooth under different load directions. Dent Mater 2015. [DOI: 10.1016/j.dental.2015.08.062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Nakajima M, Takahashi M, Teerapong M, Thitthaweerat S, Seki N, Hosaka K, Tagami J. Bond strengths of dual-cure adhesive resin cements to dentin. Dent Mater 2015. [DOI: 10.1016/j.dental.2015.08.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Akamatsu D, Yasuda M, Inaba H, Hosaka K, Tanabe T, Onae A, Hong FL. Errata: Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks. Opt Express 2014; 22:32199. [PMID: 25607184 DOI: 10.1364/oe.22.032199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We correct the errors in the uncertainty budget. The determined ratio (νYb/νSr) is corrected to be 1.207 507 039 343 341 2(17) with a fractional standard uncertainty of 1.4 × 10-15.
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Akamatsu D, Yasuda M, Inaba H, Hosaka K, Tanabe T, Onae A, Hong FL. Frequency ratio measurement of 171Yb and 87Sr optical lattice clocks. Opt Express 2014; 22:7898-905. [PMID: 24718165 DOI: 10.1364/oe.22.007898] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The frequency ratio of the (1)S(0)(F = 1/2)-(3)P(0)(F = 1/2) clock transition in (171)Yb and the (1)S(0)(F = 9/2)-(3)P(0)(F = 9/2) clock transition in (87)Sr is measured by an optical-optical direct frequency link between two optical lattice clocks. We determined the ratio (ν(Yb)/ν(Sr)) to be 1.207 507 039 343 341 2(17) fractional standard uncertainty of 1.4 × 10(-15) [corrected]. The measurement uncertainty of the frequency ratio is smaller than that obtained from absolute frequency measurements using the International Atomic Time (TAI) link. The measured ratio agrees well with that derived from the absolute frequency measurement results obtained at NIST and JILA, Boulder, CO using their Cs-fountain clock. Our measurement enables the first international comparison of the frequency ratios of optical clocks. The measured frequency ratio will be reported to the International Committee for Weights and Measures for a discussion related to the redefinition of the second.
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Katsuki H, Delagnes J, Hosaka K, Ishioka K, Chiba H, Zijlstra E, Garcia M, Takahashi H, Watanabe K, Kitajima M, Matsumoto Y, Nakamura K, Ohmori K. All-optical control and visualization of ultrafast two-dimensional atomic motions in a single crystal of bismuth. Nat Commun 2013. [PMCID: PMC3868158 DOI: 10.1038/ncomms3801] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
In a bulk solid, optical control of atomic motion provides a better understanding of its physical properties and functionalities. Such studies would benefit from active control and visualization of atomic motions in arbitrary directions, yet, so far, mostly only one-dimensional control has been shown. Here we demonstrate a novel method to optically control and visualize two-dimensional atomic motions in a bulk solid. We use a femtosecond laser pulse to coherently superpose two orthogonal atomic motions in crystalline bismuth. The relative amplitudes of those two motions are manipulated by modulating the intensity profile of the laser pulse, and these controlled motions are quantitatively visualized by density functional theory calculations. Our control-visualization scheme is based on the simple, robust and universal concept that in any physical system, two-dimensional particle motion is decomposed into two orthogonal one-dimensional motions, and thus it is applicable to a variety of condensed matter systems. Controlling the motion of atoms in solids with light allows for a deeper understanding of their fundamental properties, yet most studies only deal with one spatial dimension. Katsuki et al. extend this approach to two-dimensional control and use it to visualize atomic motion in bismuth.
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Inaba H, Hosaka K, Yasuda M, Nakajima Y, Iwakuni K, Akamatsu D, Okubo S, Kohno T, Onae A, Hong FL. Spectroscopy of 171Yb in an optical lattice based on laser linewidth transfer using a narrow linewidth frequency comb. Opt Express 2013; 21:7891-7896. [PMID: 23571880 DOI: 10.1364/oe.21.007891] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
We propose a novel, high-performance, and practical laser source system for optical clocks. The laser linewidth of a fiber-based frequency comb is reduced by phase locking a comb mode to an ultrastable master laser at 1064 nm with a broad servo bandwidth. A slave laser at 578 nm is successively phase locked to a comb mode at 578 nm with a broad servo bandwidth without any pre-stabilization. Laser frequency characteristics such as spectral linewidth and frequency stability are transferred to the 578-nm slave laser from the 1064-nm master laser. Using the slave laser, we have succeeded in observing the clock transition of (171)Yb atoms confined in an optical lattice with a 20-Hz spectral linewidth.
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Affiliation(s)
- Hajime Inaba
- National Metrology Institute of Japan, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan.
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Akamatsu D, Nakajima Y, Inaba H, Hosaka K, Yasuda M, Onae A, Hong FL. Narrow linewidth laser system realized by linewidth transfer using a fiber-based frequency comb for the magneto-optical trapping of strontium. Opt Express 2012; 20:16010-16016. [PMID: 22772290 DOI: 10.1364/oe.20.016010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A narrow linewidth diode laser system at 689 nm is realized by phase-locking an extended cavity diode laser to one tooth of a narrow linewidth optical frequency comb. The optical frequency comb is phase-locked to a narrow linewidth laser at 1064 nm, which is frequency stabilized to a high-finesse optical cavity. We demonstrate the magneto-optical trapping of Sr using an intercombination transition with the developed laser system.
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Affiliation(s)
- Daisuke Akamatsu
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Central 3, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8563, Japan.
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Iwakuni K, Inaba H, Nakajima Y, Kobayashi T, Hosaka K, Onae A, Hong FL. Narrow linewidth comb realized with a mode-locked fiber laser using an intra-cavity waveguide electro-optic modulator for high-speed control. Opt Express 2012; 20:13769-13776. [PMID: 22714442 DOI: 10.1364/oe.20.013769] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We have developed an optical frequency comb using a mode-locked fiber ring laser with an intra-cavity waveguide electro-optic modulator controlling the optical length in the laser cavity. The mode-locking is achieved with a simple ring configuration and a nonlinear polarization rotation mechanism. The beat note between the laser and a reference laser and the carrier envelope offset frequency of the comb were simultaneously phase locked with servo bandwidths of 1.3 MHz and 900 kHz, respectively. We observed an out-of-loop beat between two identical combs, and obtained a coherent δ-function peak with a signal to noise ratio of 70 dB/Hz.
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Affiliation(s)
- Kana Iwakuni
- Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Yokohama, Kanagawa, 223-8522, Japan.
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Hosaka K, Inaba H, Nakajima Y, Yasuda M, Kohno T, Onae A, Hong FL. Evaluation of the clock laser for an Yb lattice clock using an optic fiber comb. IEEE Trans Ultrason Ferroelectr Freq Control 2010; 57:606-612. [PMID: 20211777 DOI: 10.1109/tuffc.2010.1454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A light source to drive the (1)S0-(3)P0 transition in Yb atoms is generated by 2 solid state lasers: a Nd:YAG laser and an Yb:YAG laser, using a sum-frequency generation (SFG) scheme. With a ridge waveguide (WG) periodically poled lithium niobate (PPLN) device, SFG power of about 150 mW is obtained at the required frequency. The zero-expansion temperature of a Fabry-Pérot etalon was determined by using a home-made fiber-based optical frequency comb running continuously for weeks. Frequency stabilization of the clock laser system was also evaluated by the optical frequency comb.
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Nakajima Y, Inaba H, Hosaka K, Minoshima K, Onae A, Yasuda M, Kohno T, Kawato S, Kobayashi T, Katsuyama T, Hong FL. A multi-branch, fiber-based frequency comb with millihertz-level relative linewidths using an intra-cavity electro-optic modulator. Opt Express 2010; 18:1667-1676. [PMID: 20173994 DOI: 10.1364/oe.18.001667] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate that fiber-based frequency combs with multi-branch configurations can transfer both linewidth and frequency stability to another wavelength at the millihertz level. An intra-cavity electro-optic modulator is employed to obtain a broad servo bandwidth for repetition rate control. We investigate the relative linewidths between two combs using a stable continuous-wave laser as a common reference to stabilize the repetition rate frequencies in both combs. The achieved energy concentration to the carrier of the out-of-loop beat between the two combs was 99% and 30% at a bandwidth of 1 kHz and 7.6 mHz, respectively. The frequency instability of the comb was 3.7x10(-16) for a 1 s averaging time, improving to 5-8x10(-19) for 10000 s. We show that the frequency noise in the out-of-loop beat originates mainly from phase noise in branched optical fibers.
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Hosaka K, Nishitani Y, Tagami J, Yoshiyama M, Brackett WW, Agee KA, Tay FR, Pashley DH. Durability of resin-dentin bonds to water- vs. ethanol-saturated dentin. J Dent Res 2009; 88:146-51. [PMID: 19278986 DOI: 10.1177/0022034508328910] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Higher 24-hour resin-dentin bond strengths are created when ethanol is used to replace water during wet bonding. This in vitro study examined if ethanol-wet-bonding can increase the durability of resin-dentin bonds over longer times. Five increasingly hydrophilic experimental resin blends were bonded to acid-etched dentin saturated with water or ethanol. Following composite build-ups, the teeth were reduced into beams for 24-hour microtensile bond strength evaluation, and for water-aging at 37 degrees C for 3, 6, or 12 months before additional bond strength measurements. Although most bonds made to water-saturated dentin did not change over time, those made to ethanol-saturated dentin exhibited higher bond strengths, and none of them fell over time. Decreased collagen fibrillar diameter and increased interfibrillar spacing were seen in hybrid layers created with ethanol-wet-bonding. Increases in bond strength and durability in ethanol-wet-bonding may be due to higher resin uptake and better resin sealing of the collagen matrix, thereby minimizing endogenous collagenolytic activities.
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Affiliation(s)
- K Hosaka
- Cariology and Operative Dentistry, Graduate School, Tokyo Medical and Dental University, Tokyo, Japan
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Hong FL, Inaba H, Hosaka K, Yasuda M, Onae A. Doppler-free spectroscopy of molecular iodine using a frequency-stable light source at 578 nm. Opt Express 2009; 17:1652-1659. [PMID: 19188995 DOI: 10.1364/oe.17.001652] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
A stable light source obtained using sum-frequency generation (SFG) is developed for high-resolution spectroscopy at 578 nm. Hyperfine transitions of molecular iodine are observed by using the SFG light source with saturation spectroscopy. The light source is frequency stabilized to the observed hyperfine transition and achieves a stability of 2x10(-12) for a 1-s averaging time. The absolute frequency of the light source stabilized on the a1 component of the R(37)16-1 transition is determined as 518304551833 (2) kHz. This transition serves as a frequency reference for the (1)S(0)-(3)P(0) optical clock transition in neutral ytterbium (Yb).
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Affiliation(s)
- Feng-Lei Hong
- National Metrology Institute of Japan (NMIJ), National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 3, Ibaraki, Japan.
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Fujii Y, T S, Koitabashi A, Hashimoto T, Hosaka K, Tabei K, Namatame T, Yoneda M, Hiraishi H, Terano A. Down-Regulation of TFF Expression by TNF-α in Gastric Epithelial Cells. Wound Repair Regen 2005. [DOI: 10.1111/j.1067-1927.2005.130116f.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Koitabashi A, Shimada T, Fujii Y, Hashimoto T, Hosaka K, Tabei K, Namatame T, Yoneda M, Hiraishi H, Terano A. Indometacin up-regulates TFF2 expression in gastric epithelial cells. Aliment Pharmacol Ther 2004; 20 Suppl 1:171-6. [PMID: 15298624 DOI: 10.1111/j.1365-2036.2004.01991.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Trefoil factor family peptides are expressed in gastrointestinal epithelial cells and play a critical role in maintaining mucosal integrity. Although non-steroidal anti-inflammatory drugs (NSAIDs) are important causative agents of gastric mucosal lesions, few data are available about the effect of NSAIDs on trefoil family peptides in gastric mucosa. AIM To examine whether indometacin, a widely used NSAID, affects trefoil factor family expression in gastric epithelial cells. METHODS MKN45, a cell line derived from human gastric cancer, was used. TFF1, TFF2, and TFF3 mRNA expression was assessed by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR). TFF2 gene transcription was also examined by luciferase reporter gene assay. RESULTS Relative expression level of TFF1, TFF2, TFF3 mRNA was 616: 12: 1 in unstimulated MKN45 cells. Although indometacin (1-250 micro mol/L) had no significant effect on the expression of TFF1 and TFF3 mRNA, it up-regulated TFF2 mRNA expression in a dose- and time-dependent manner. Luciferase reporter gene assay confirmed the up-regulation of TFF2 gene transcription by indometacin. Indometacin-induced up-regulation of TFF2 expression was not antagonized by externally applied prostaglandin E2. CONCLUSION These results suggest that indometacin up-regulates gastric epithelial cell TFF2 expression through a COX-independent mechanism. Since TFF peptides play an important role in gastric mucosal protection, indometacin-induced TFF2 may reduce the degree of gastric mucosal damage induced by indometacin.
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Affiliation(s)
- A Koitabashi
- Department of Gastroenterology and Institute for Medical Science, Dokkyo University School of Medicine, Mibu, Tochigi, Japan
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Adachi J, Hosaka K, Furuya S, Soejima K, Takahashi M, Yagishita A, Semenov SK, Cherepkov NA. Shape-resonance-enhanced vibrational effects in the angular distributions of C 1s photoelectrons from fixed-in-space CO molecules. Phys Rev Lett 2003; 91:163001. [PMID: 14611399 DOI: 10.1103/physrevlett.91.163001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2003] [Indexed: 05/24/2023]
Abstract
Angular distributions of C 1s photoelectrons from fixed-in-space CO molecules have been measured with vibrational resolution. A strong dependence of the angular distributions on the vibrational states of the residual molecular ion has been found for the first time in the region of the shape resonance. Calculations in the relaxed core Hartree-Fock approximation have reproduced the angular distributions fairly well in the general shapes of the angular distributions due to the correct description of nuclear motion as an average of the internuclear-distance-dependent dipole amplitudes.
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Affiliation(s)
- J Adachi
- Photon Factory, Institute of Materials Structure Science, Tsukuba 305-0801, Japan
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Samitsu Y, Hosaka K. Molecular marker analysis of 24- and 25-chromosome plants obtained from Solanum tuberosum L. subsp. andigena (2n = 4x = 48) pollinated with a Solanum phureja haploid inducer. Genome 2002; 45:577-83. [PMID: 12033627 DOI: 10.1139/g02-019] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Clones with 24 or 25 chromosomes were obtained by pollinating an Andean cultivated tetraploid potato (Solanum tuberosum subsp. andigena clone 94H94, 2n = 4x = 48) with the Solanum phureja haploid-inducer clone 1.22. Their genetic composition was analyzed in an RAPD assay using 135 decamer primers and in an RFLP assay using 45 single-copy DNA probes. In total, 22 RAPD and 20 RFLP markers were found to be specific to S. phureja. None of these markers were found in the 24- and 25-chromosome clones. RFLP genotypes for the 45 RFLP loci were further determined for each clone. Genotypes of the 24-chromosome clones were characterized using two alleles randomly selected from four alleles of the parental tetraploid clone for almost all RFLP loci. Five 25-chromosome clones had extra alleles for all of the RFLP loci of chromosomes 4, 8, 10, 11, and 12, respectively, suggesting primary trisomy for one of these chromosomes. Clones with genotypes showing double reduction were also identified. Therefore, the obtained clones likely originated from random samples of female gametes, and hence are euhaploids or aneuhaploids of S. tuberosum subsp. andigena, strongly supporting parthenogenesis to be a primary mechanism for haploid induction in potato.
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Affiliation(s)
- Y Samitsu
- Experimental Farm, Kobe University, Kasai, Hyogo, Japan
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Sato K, Hosaka K, Ohkawa M, Tokieda Y, Ishiwata I. Cloned transgenic mouse fetuses from embryonic stem cells. Hum Cell 2001; 14:301-4. [PMID: 11925932] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Development of efficient efficient system for genetic modification and large-scale cloning of livestock is of importance for agriculture, biotechnology, or human medicine. The mouse, on the other hand, is an ideal model in the basic studies of genetic modification. In this study, we investigated about production of clone mice from established embryonic stem (ES) cell line by nuclear transfer. Further, we had try of production of cloned transgenic mouse fetuses/offspring using ES cells modified with a marker gene, EGFP. With the ES cell line TT2 which is at least 15 passages, reconstructed oocytes developed to 2-8 cell embryos, morulae, or blastocysts (44.8%), and 17.2% of them developed to term (19.5 days post-coitum, dpc). When 40 embryos with the marker gene transferred to 11 surrogate mothers (pseudopregnant females), 5 live fetuses were recognized in the uteli at 13.5 dpc and in these fetuses expression of GFP was observed, but none developed beyond 19.5 dpc. The present results suggest that ES cells can be used tg produce cloned mice.
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Affiliation(s)
- K Sato
- Department of Applied Biological Science, Nihon University
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Ohi S, Hosaka K, Ohkawa M, Sato K. Cloned murine fetuses produced by nuclear transfer using metaphase-arrested embryonic stem cells. Hum Cell 2001; 14:317-22. [PMID: 11925934] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
We examined whether metaphase nuclei could be used as nuclear donors in nuclear transfer in mice. The reconstructed embryos were developed to fetuses in both the metaphase-nuclear transfer and the G1-nuclear transfer. We also performed enucleation of oocytes following nuclear injection (injection-enucleation method) using microinjection method with a piezo-driven micromanipulator in order to produce the cloned murine fetuses. We found that this method could shorten time for manipulation in comparison with the conventional method performing nuclear injection following enucleation of oocytes (enucleation-injection method). We produced successfully cloned fetuses by the injection-enucleation method. Furthermore, there was no difference of developmental efficiency in reconstructed embryos from between B6D2F1 and ddY strain as oocyte donor.
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Affiliation(s)
- S Ohi
- Department of Applied Biological Science, Nihon University
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Yamashita S, Hosaka K, Nikawa J, Kodaki T. [Regulation of phospholipid synthesis in yeast]. Seikagaku 2001; 73:247-60. [PMID: 11449678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Affiliation(s)
- S Yamashita
- Department of Biochemistry, Gunma University School of Medicine, 3-39-22 Showa-machi, Maebashi 371-8511
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Uchida K, Nakayama H, Yoshida K, Hosaka K, Hasegawa A, Matsumoto T, Tateda K. [Opportunistic pneumonia after kidney transplantation]. Nihon Kokyuki Gakkai Zasshi 2001; 39:166-71. [PMID: 11431908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/20/2023]
Abstract
This study was conducted to evaluate clinical features at the onset of pneumonia and the usefulness of methods for diagnosing pneumonia in patients who have undergone kidney transplantation. From January 1990 to December 1998. 174 kidney transplantations were performed, and were followed by 22 cases of pneumonia. Of the 22 pneumonia patients, 16 were male and 6 were female. The median age of the 22 patients was 37.2 +/- 13.3 years. All the patients received cyclosporin A and corticosteroids. In 11 cases, the organisms were identified in the microbiology or pathology laboratory, either during life or at autopsy. Six cases were due to Pneumocystis carinii (PC), three to PC and Cytomegalovirus (CMV), one to Aspergillus, and one resulted from miliary tuberculosis. Pneumonia occurred within 4 months after kidney transplantation in most cases. The mean interval between the transplantation and the appearance of pneumonia was 77.3 +/- 34.3 days, except in the cases of Aspergillosis and miliary tuberculosis, where the intervals were 46 and 50 months, respectively. The mean interval from the appearance of symptoms to the detection of pulmonary infiltration was 3.3 +/- 4.3 days. The clinical features present when pulmonary infiltration was detected by CT were fever (91%), cough (32%), and crackles (27%). However, at this time, 55% of the cases had no symptoms other than fever. Chest radiographs were positive for pulmonary infiltration in 64% of the cases at the same time that the pulmonary infiltrates were detected by CT. Eighty percent of the cases exhibited diffuse interstitial infiltrates. Organisms were detected in 7 of 9 cases examined with bronchofiberscopy (BF). But in only one of 13 cases that did not undergo BF. Increased values of serum beta-D-glucan were detected in the early phase of three PC pneumonia cases, suggesting that beta-D-glucan is useful as a marker of PC pneumonia. The use of bronchofiberscopy was more frequent in survivors of PC pneumonia than in non-survivors, whereas the mean age was higher and coexisting CMV infections were identified more frequently in the non-survivors. We concluded that fever is important as an initial symptom of pulmonary infection. In addition, we find that CT is very useful for the detection of interstitial infiltrates, and BF is an excellent method for detecting organisms in the pneumonia patient after kidney transplantation.
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Affiliation(s)
- K Uchida
- Second Department of Internal Medicine, Toho University School of Medicine, 6-11-1 Omori-nishi, Ota-ku, Tokyo 143-8541
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Sato K, Hosaka K, Ohi S, Uchiyama H, Tokieda Y, Ishiwata I. Mouse fetuses by nuclear transfer from embryonic stem cells. Hum Cell 2000; 13:197-202. [PMID: 11329935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
At present, two methods for cloning mammals by nuclear transfer are employed. The first is based on cell fusion and has been applied to domestic animals, such as sheep, cows, and goats. While, nuclear microinjection has been used in mice only. Cloning by nuclear transfer has been reported mainly with cells from primary culture and freshly isolated cells. Here, using ES cell line TT2, we tried to produce clone mouse embryos by the two methods. With ES cell line TT2 (10-13 passaged), 16% of reconstructed oocytes microinjected with the nuclei developed in vitro to the morula/blastocycst stage, and 50% of these embryos developed to fetuses until 14 dpc when transferred to pseudopregnant females. At 20 dpc implanted sites were degenerated and absorbed. Also, in vitro development of embryos reconstructed by electrofusion shown similar results. But, when transferred to recipients, subsequent development of embryos showed lower rates, as compared with embryos microinjected and from recipients live-born pups could not be obtained.
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Affiliation(s)
- K Sato
- Department of Applied Biological Science, Nihon University College of Bioresource Sciences
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Hosaka K, Ohi S, Ando A, Kobayashi M, Sato K. Cloned mice derived from somatic cell nuclei. Hum Cell 2000; 13:237-42. [PMID: 11329940] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
In 1997, a cloned sheep "Dolly" was produced by nuclear transfer of somatic cell. The first birth of cloned mice derived from some somatic cells were succeeded in 1998. At present, it is shown that somatic cells, cumulus cells, fibroblasts and Sertoli cells can be used to the study of cloned animal as nuclear donor. In this study investigation was designed to compare with efficiency on the production of cloned embryos by using the microinjection and the electrofusion methods for nuclear transfer. Oocyte enucleation was performed with a micromanipulator. The oocyte was held by holding pipette, and was enucleated using a beveled pipette. Microinjection method: Cell's nucleus injection was carried out by piezo-micromanipulator. Cytochalasin B treated cumulus cell was aspirated into a injection pipette, and was broken its plasma membrane using the injection pipette. Then, the cumulus cell was injected into the enucleated ooplasm directly. Electrofusion method: The cell was aspirated into a beveled pipette, and then an aspirated cell was inserted into perivitelline space. Then, the pair of enucleated oocyte and cell was fused using electrical cell fusion apparatus. The reconstituted embryos were activated after nuclear transfer using St2+. Reconstituted embryos had been produced by the microinjection showed the embryonic development to over 8-cell stages. But, the rate of fragmentation of reconstituted embryos by the microinjection showed a little high rate in comparison with the electrofusion. When some reconstituted embryos by the microinjection were transplanted to pseudopregnant females' oviduct, 9 fetuses were observed at 14 days post coitum.
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Affiliation(s)
- K Hosaka
- Department of Applied Biological Science, Nihon University College of Bioresource Sciences
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Nomura Y, Yamasaki K, Sakamoto S, Hayasi N, Hosaka K, Fukusima K, Sugimura K, Sakai H, Nagai H. [A new method for pharmacokinetic analysis of 99mTc-GSA using two-compartment and two-parameter model]. Kaku Igaku 2000; 37:631-8. [PMID: 11193448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
Technetium-99m-diethylenetriaminepentaacetic acid-galactosyl-human serum albumin (99mTc-GSA) is a liver scintigraphy agent which binds to asialoglycoprotein receptor in hepatocyte. Twenty-six patients with liver dysfunction were examined with 99mTc-GSA liver scintigraphy using two-compartment and two-parameter model (2C2P model). The 99mTc-GSA was assumed to move within two compartments (whole blood and liver). k1 and k2 were parameters which represented transfer rate constant from blood to liver, and from liver to blood, respectively. Two differential equations based on 2C2P model were integrated, so that k1, k2, k1/k2 and VLmg were estimated from the time-activity curves of the heart and liver. VLmg was computed as maximum amount of 99mTc-GSA binding to liver. The results were compared with the liver function tests and the conventional 99mTc-GSA indices: HH15, LHL15, and LU15. k1/k2 and VLmg values had positive correlation with the result of the serum liver function tests, Plt., T.Bil., ChE, GOT, LDH, ALP and gamma GTP. It is concluded that this new method using 2C2P model is not invasive and simplest in the 99mTc-GSA liver scintigraphies, and may be useful in evaluating liver function.
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Affiliation(s)
- Y Nomura
- Department of Radiology, Kobe University School of Medicine
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Abstract
To develop inbred lines from self-incompatible, cultivated diploid potatoes, an S-locus inhibitor (Sli) gene derived from a self-compatible variant of a wild potato species, Solanum chacoense, was incorporated into various cultivated diploid potatoes. The progeny was selfed twice by the action of the Sli gene to obtain 74 S2 inbred clones belonging to 8 families. More than 40% of them were either non-flowering or pollen sterile. Among the pollen fertile clones, self-compatible clones occurred with a much lower frequency (20.9%) than expected (83.3%). The result demonstrated that self-compatibility was introduced and expressed in the gene pool of cultivated diploid potatoes by an action of the Sli gene, although serious inbreeding depression associated with selfing occurred. The genotypes of S2 inbreds were surveyed using 46 S. chacoense-specific RFLP (restriction fragment length polymorphism) markers covering the whole potato genome. More than half of the markers (67.4%) showed distorted segregation. Particularly, all markers on chromosome 12 were overrepresented in the S2 inbreds. This confirms our earlier finding that the Sli gene locates on chromosome 12 and the alleles linked with this gene are preferentially transmitted because of its essential requirement for selfing.
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Affiliation(s)
- R K Birhman
- Division of Genetics, Central Potato Research Institute, Shimla, India
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41
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Xue HW, Hosaka K, Plesch G, Mueller-Roeber B. Cloning of Arabidopsis thaliana phosphatidylinositol synthase and functional expression in the yeast pis mutant. Plant Mol Biol 2000; 42:757-764. [PMID: 10809447 DOI: 10.1023/a:1006308909105] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
It is believed that phosphatidylinositol (PI) metabolism plays a central role in signalling pathways in both animals and higher plants. PI is synthesized from CDP-diacylglycerol (CDP-DG) and myo-inositol by phosphatidylinositol synthase (PI synthase, EC 2.7.8.11). Here we report the identification of a plant cDNA (AtPIS1) encoding a 26 kDa PI synthase from Arabidopsis thaliana. The plant enzyme as deduced from its cDNA sequence shares 35-41% identical amino acids with PI synthases from Saccharomyces cerevisiae and mammals. AtPIS1 functionally complements a mutant of S. cerevisiae with a lesion in PI synthase, and recombinant AtPIS1 protein present in yeast membranes strongly depends on the two principal substrates, myo-inositol and CDP-DG, and requires Mg2+ ions for full activity.
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MESH Headings
- Amino Acid Sequence
- Arabidopsis/enzymology
- Arabidopsis/genetics
- Arabidopsis Proteins
- Blotting, Northern
- CDP-Diacylglycerol-Inositol 3-Phosphatidyltransferase
- Cloning, Molecular
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Plant
- Genetic Complementation Test
- Membrane Proteins
- Molecular Sequence Data
- Mutation
- RNA, Plant/genetics
- RNA, Plant/metabolism
- Saccharomyces cerevisiae/enzymology
- Saccharomyces cerevisiae/genetics
- Sequence Alignment
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Tissue Distribution
- Transferases (Other Substituted Phosphate Groups)/genetics
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Affiliation(s)
- H W Xue
- Max-Planck-Institute of Molecular Plant Physiology, Golm/Potsdam, Germany
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42
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Nakamura Y, Oki I, Tanihara S, Ojima T, Ito Y, Yamazaki O, Iwama M, Tabata Y, Katsuyama K, Sasai Y, Nakagawa M, Matsushita A, Hossaka K, Sato J, Hidaka Y, Uda H, Nakamata K, Yanagawa H, Hosaka K. Relationship between breast milk feeding and atopic dermatitis in children. J Epidemiol 2000; 10:74-8. [PMID: 10778030 DOI: 10.2188/jea.10.74] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVE To determine whether or not the breast milk feeding has a role in the prevalence of atopic dermatitis among children. METHODS The target population of the study was all children participating in health check-up program for 3-year-old children in 60 municipalities locating 10 selected prefectures during designated 2 months between October and December 1997. Using a questionnaire, information on nutrition in infants (breast milk only, bottled milk only, or mixed), parity, mothers' age at birth, and a history of atopic dermatitis was obtained. Besides, data on potential confounding factors were obtained. RESULTS Questionnaires from 3856 children (81.6% of those who were to participate in the programs, and 96.4% of children who participated them) were analyzed. After the adjustment for all potential confounding factors using unconditional logistic models, the risk of atopic dermatitis was slightly higher among children with breast milk (odds ratio [OR] = 1.16 with 95% confidence interval [CI] 0.96-1.40). Mothers' age at birth (OR for those who were more than 30 years or older in comparison with those who were younger than 30 years = 1.15; 95% CI, 0.96-1.37) and those with second or later parity orders (OR = 1.14, 95% CI; 0.95-1.35) showed odds ratios that were higher than unity without statistical significance. CONCLUSION Breast milk elevates the risk of atopic dermatitis slightly without statistical significance; the risk may be, however, higher in children in second or later parity orders.
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Affiliation(s)
- Y Nakamura
- Department of Health Science, Jichi Medical School, Tochigi, Japan
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43
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Ueno Y, Hosaka K, Hosaka K, Takezaki T. [A case of infected renal cyst extending to leg abscess]. Hinyokika Kiyo 2000; 46:105-7. [PMID: 10769799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
A 45-year-old woman was referred to our hospital with the chief complaint of left flank pain, left leg pain and loss of appetite. Computed tomography scan and magnetic resonance imaging demonstrated a large cystic mass in the left kidney, which we diagnosed as an infected renal cyst. Under ultrasonic guidance, percutaneous puncture and drainage of the renal cyst were performed. After her leg pain worsened, computed tomography revealed abscesses in the left leg, suggesting an infected renal cyst extending to the leg through the obturator foramen. Under general anesthesia, incision and drainage were performed. Cultures from the cyst and abscess fluid showed Klebsiella pneumoniae. Our case is the 82nd case of an infected renal cyst in the Japanese literature.
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Affiliation(s)
- Y Ueno
- Department of Urology, Yamanashi Prefectural Central Hospital
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44
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Kobayashi I, Hosaka K, Maruo H, Saeki Y, Kamiyama M, Konno C, Gemba M. Role of prostaglandin E2 and leukotriene B4 in skin reaction induced by transdermal application of propranolol. Biol Pharm Bull 2000; 23:208-12. [PMID: 10706386 DOI: 10.1248/bpb.23.208] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dermal application of propranolol (PRL) induced formation of erythema and edema, and pseudoeosinophil infiltration in epidermis and dermis at the application site in guinea pigs. We investigated the production of prostaglandin E2 (PGE2) and leukotriene B4 (LTB4) at the application site of PRL and the role of these inflammatory chemical mediators in the occurrence of the skin reactions. PGE2 was found to be produced at the application site slightly after the accumulation of PRL released from the adhesive bandage in the patch test, and the amount of PGE2 increased continuously, with a peak value obtained at 24 h after application. The time-course changes resembled those of delta a* value, the index of erythema formation determined by colorimetric measurement, and edema formation. The production of PGE2 by dermal application of PRL was suppressed by local pretreatment with dexamethasone or indomethacin. However, no notable production of LTB4 was observed at the application site of PRL.
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Affiliation(s)
- I Kobayashi
- Toxicological Research Center, Nitto Denko Corporation, Ibaraki, Osaka, Japan
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45
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Birhman R, Hosaka K. Production of inbred progenies of diploid potatoes using an S-locus inhibitor ( Sli) gene, and their characterization. Genome 2000. [DOI: 10.1139/gen-43-3-495] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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46
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Ueno Y, Hosaka K, Takezaki T. [A case of vesicovaginal fistula with vaginal stone]. Hinyokika Kiyo 1999; 45:763-5. [PMID: 10637739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
The patient, a 51-year-old woman developed urinary incontinence after an abdominal hysterectomy 3 years earlier. She was referred to our hospital complaining of urine leakage from her vagina after spontaneous passage of a stone. Drip infusion pyelography and cystography demonstrated a vesicovaginal fistula. She underwent repair of the fistula with an abdominal procedure. The stone was composed of magnesium ammonium phosphate.
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Affiliation(s)
- Y Ueno
- Department of Urology, Yamanashi Prefectural Central Hospital
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47
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Abstract
The differentiation-inducing factor-1 (DIF-1) is a putative morphogen that induces stalk-cell formation in the lower eukaryote Dictyostelium discoideum. This molecule has been shown to inhibit cell growth and induce erythroid differentiation in human leukemia K562 cells. In the present study, to clarify the mechanism of the actions of DIF-1, we examined the effect of DIF-1 on Akt/protein kinase B (PKB) in K562 cells. Akt/PKB is a serine/threonine kinase that plays a pivotal role in the regulation of cell survival and differentiation in a variety of cells. A nonphosphorylated (inactive) form of Akt/PKB was ordinarily expressed in K562 cells. However, Akt/PKB was phosphorylated and potently activated within several hours of incubation with 5-30 microM DIF-1, and this activation was inhibited by wortmannin, an inhibitor of phosphatidylinositol 3-kinase (PI3-kinase). Calcium-increasing agents thapsigargin and A23187 also activated Akt/PKB slightly, which was inhibited by wortmannin. By contrast, calcium-reducing agents TMB-8 and EGTA together with A23187 inhibited the DIF-1-induced activation of Akt/PKB. PMA (PKC activator) also activated Akt/PKB but this activation was not inhibited by wortmannin. DIF-1 exhibited no marked effect on the activation of PKCalpha, beta, and gamma, which were activated by PMA. These results indicate that DIF-1 activates Akt/PKB possibly via cytosolic calcium and subsequent activation of PI3-kinase and also that PMA activates Akt/PKB in a PI3-kinase-independent manner.
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Affiliation(s)
- Y Kubohara
- Department of Molecular Physiology, Institute for Molecular and Cellular Regulation (IMCR), Gunma University, Maebashi, 371-8512, Japan.
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48
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Shinozawa Y, Sim JJ, Hoshino M, Shimizu K, Nakayama H, Hosaka K, Uchida K, Nagaizumi K, Fukutake K. [Pulmonary thromboembolism accompanied by abnormal plasminogen]. Nihon Kokyuki Gakkai Zasshi 1999; 37:728-32. [PMID: 10540842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
A 38-year-old man was admitted to our hospital because of sudden chest pain and bloody sputum. Lung perfusion scintigraphy disclosed segmental defects in both lungs. An enhanced thin-section computed tomographic scan of the chest showed a low-density area in the right main pulmonary artery. These findings yielded a diagnosis of pulmonary thromboembolism. Serum plasminogen activity was low, not only in the patient but in his elder brother and daughter. Gene analysis revealed a point mutation at exon 15 of the plasminogen gene, suggesting abnormal plasminogen. Abnormal plasminogen is more prevalent in Japan than in the USA or Europe, and is usually asymptomatic. Thromboembolism in patients with abnormal plasminogen is very rare. Further studies are needed to elucidate the relationship between plasminogen abnormalities and pulmonary thromboembolism.
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Affiliation(s)
- Y Shinozawa
- Second Department of Internal Medicine, Toho University School of Medicine, Tokyo, Japan
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49
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Abstract
The two-hybrid system that identifies protein-protein interactions in a yeast expression system was used to investigate porcine anterior pituitary transcription factors. Four cDNA clones of a protein interacting with the leucine zipper domain of porcine cJun were obtained. Their nucleotide sequences revealed that they encode activating transcription factor 4 (ATF4). A full-length cDNA of porcine ATF4 was obtained by the polymerase chain reaction, and its deduced amino acid sequence showed 88 and 83% identity to human and mouse ATF4, respectively. Reverse transcription-polymerase chain reaction analysis of mRNAs prepared from 11 porcine tissues demonstrated that ATF4 is ubiquitous. Immunohistochemistry showed that ATF4 is present in the hormone producing cells of the anterior pituitary, but absent in some cells of the anterior pituitary. Further binding analysis revealed that ATF4 also interacts with itself and cFos. This evidence of ATF4 homodimerization, as well as heterodimerization with cJun and cFos in the anterior pituitary suggests a novel mechanism for the regulation of gene expression in this tissue.
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Affiliation(s)
- Y Kato
- Biosignal Research Center, Institute for Molecular and Cellular Regulation, Maebashi, Gunma, Japan
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50
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Rivas MP, Kearns BG, Xie Z, Guo S, Sekar MC, Hosaka K, Kagiwada S, York JD, Bankaitis VA. Pleiotropic alterations in lipid metabolism in yeast sac1 mutants: relationship to "bypass Sec14p" and inositol auxotrophy. Mol Biol Cell 1999; 10:2235-50. [PMID: 10397762 PMCID: PMC25439 DOI: 10.1091/mbc.10.7.2235] [Citation(s) in RCA: 122] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
SacIp dysfunction results in bypass of the requirement for phosphatidylinositol transfer protein (Sec14p) function in yeast Golgi processes. This effect is accompanied by alterations in inositol phospholipid metabolism and inositol auxotrophy. Elucidation of how sac1 mutants effect "bypass Sec14p" will provide insights into Sec14p function in vivo. We now report that, in addition to a dramatic accumulation of phosphatidylinositol-4-phosphate, sac1 mutants also exhibit a specific acceleration of phosphatidylcholine biosynthesis via the CDP-choline pathway. This phosphatidylcholine metabolic phenotype is sensitive to the two physiological challenges that abolish bypass Sec14p in sac1 strains; i.e. phospholipase D inactivation and expression of bacterial diacylglycerol (DAG) kinase. Moreover, we demonstrate that accumulation of phosphatidylinositol-4-phosphate in sac1 mutants is insufficient to effect bypass Sec14p. These data support a model in which phospholipase D activity contributes to generation of DAG that, in turn, effects bypass Sec14p. A significant fate for this DAG is consumption by the CDP-choline pathway. Finally, we determine that CDP-choline pathway activity contributes to the inositol auxotrophy of sac1 strains in a novel manner that does not involve obvious defects in transcriptional expression of the INO1 gene.
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Affiliation(s)
- M P Rivas
- Department of Cell Biology, University of Alabama at Birmingham, Birmingham, Alabama 35294-0005, USA
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