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  1. Article ; Online: Formation of radicals in irradiated maltose - the role of hydrogen bonding with water.

    Nakagawa, Seiko

    Free radical research

    2022  Volume 56, Issue 2, Page(s) 222–227

    Abstract: The EPR spectra of irradiated maltose were obtained and compared to those of sucrose and glucose. In maltose anhydrite, the main radicals were produced from the cleavage of the glycoside bond at the C1 carbon with a carbonyl at the C2 carbon the same as ... ...

    Abstract The EPR spectra of irradiated maltose were obtained and compared to those of sucrose and glucose. In maltose anhydrite, the main radicals were produced from the cleavage of the glycoside bond at the C1 carbon with a carbonyl at the C2 carbon the same as those in sucrose. On the contrary, a carbonyl anion radical involving the proton hydrogen bonding to a water molecule was also observed in maltose monohydrate. The conformation of the carbonyl anion radical changed and became stable.
    MeSH term(s) Carbon ; Electron Spin Resonance Spectroscopy ; Free Radicals/chemistry ; Hydrogen Bonding ; Maltose ; Sucrose/chemistry ; Water
    Chemical Substances Free Radicals ; Water (059QF0KO0R) ; Sucrose (57-50-1) ; Maltose (69-79-4) ; Carbon (7440-44-0)
    Language English
    Publishing date 2022-05-08
    Publishing country England
    Document type Journal Article
    ZDB-ID 1194130-3
    ISSN 1029-2470 ; 1071-5762
    ISSN (online) 1029-2470
    ISSN 1071-5762
    DOI 10.1080/10715762.2022.2071267
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 2236: Show issues Location:
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  2. Article ; Online: Improvement of the method to estimate the relative reaction rate constants of hydroxyl radical with polyphenols using ESR spin trap: X-ray irradiation of water with a flowing system.

    Nakagawa, Seiko

    Free radical research

    2017  Volume 51, Issue 7-8, Page(s) 749–754

    Abstract: UV-photolysis of hydrogen peroxide is a useful technique to produce hydroxyl radical. However, it is not an appropriate method to estimate the reactivity of polyphenols with hydroxyl radicals because many of the polyphenol derivatives also absorb the UV- ... ...

    Abstract UV-photolysis of hydrogen peroxide is a useful technique to produce hydroxyl radical. However, it is not an appropriate method to estimate the reactivity of polyphenols with hydroxyl radicals because many of the polyphenol derivatives also absorb the UV-light to generate hydroxyl radicals. In this study, X-ray irradiation of water with a flowing system was applied to estimate the reactivity of hydroxyl radicals with polyphenols using electron spin resonance (ESR) spin trap. The obtained relative reaction rates reasonably agreed with previous data by pulse radiolysis. This method will be a useful technique to estimate the reactivity of antioxidants including polyphenols with hydroxyl radicals.
    Language English
    Publishing date 2017-07
    Publishing country England
    Document type Journal Article
    ZDB-ID 1194130-3
    ISSN 1029-2470 ; 1071-5762
    ISSN (online) 1029-2470
    ISSN 1071-5762
    DOI 10.1080/10715762.2017.1370091
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  3. Article ; Online: Development of a silicone-based radio-fluorogenic dosimeter using dihydrorhodamine 6G.

    Maeyama, Takuya / Hayashi, Kiichiro / Watanabe, Yusuke / Ohara, Maki / Nakagawa, Seiko

    Physica medica : PM : an international journal devoted to the applications of physics to medicine and biology : official journal of the Italian Association of Biomedical Physics (AIFB)

    2023  Volume 114, Page(s) 102684

    Abstract: A silicon-based three-dimensional dosimeter can be formed in a free shape without a container and deformed because of its flexibility. Several studies have focused on enhancing its radiological characteristics and assessing its applicability as a quality ...

    Abstract A silicon-based three-dimensional dosimeter can be formed in a free shape without a container and deformed because of its flexibility. Several studies have focused on enhancing its radiological characteristics and assessing its applicability as a quality assurance tool for image-guided and adaptive radiation therapy, considering motion and deformation. Here, we applied a fluorescence probe (dihydrorhodamine 6G, DHR6G) to a silicon elastomer as a new radiosensitive compound that converts nonfluorescent into fluorescent dyes using irradiation, and its fluorescence intensity increases linearly with the absorbed dose. In this study, we demonstrated a cost-effective synthesis method and optimized the composition conditions. The results showed that the DHR6G-SE prepared from 2.2 × 10
    MeSH term(s) Radiation Dosimeters ; Silicones ; Radiometry/methods ; Rhodamines
    Chemical Substances dihydrorhodamine 6G ; Silicones ; Rhodamines
    Language English
    Publishing date 2023-09-30
    Publishing country Italy
    Document type Journal Article
    ZDB-ID 1122650-x
    ISSN 1724-191X ; 1120-1797
    ISSN (online) 1724-191X
    ISSN 1120-1797
    DOI 10.1016/j.ejmp.2023.102684
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  4. Article ; Online: Estimation of relative reaction rate of hydroxy radical with poly-hydroxy benzenes: ESR spin trapping combined with UV-A photolysis.

    Nakagawa, Seiko

    Analytical sciences : the international journal of the Japan Society for Analytical Chemistry

    2013  Volume 29, Issue 3, Page(s) 377–380

    Abstract: The reaction of the hydroxy radical with thymidine and poly-hydroxy benzenes; i.e., catechol, resorcinol, hydroquinone, and pyrogallol, was studied by ESR spin trapping combined with the UV-A photolysis of hydrogen peroxide. The obtained relative ... ...

    Abstract The reaction of the hydroxy radical with thymidine and poly-hydroxy benzenes; i.e., catechol, resorcinol, hydroquinone, and pyrogallol, was studied by ESR spin trapping combined with the UV-A photolysis of hydrogen peroxide. The obtained relative reaction rates reasonably agreed with those previously obtained by pulse radiolysis. Electron distribution in the HOMO obtained by DFT calculations also supports the resulting order of reactivity of the polyphenols.
    MeSH term(s) Benzene/chemistry ; Electron Spin Resonance Spectroscopy ; Hydrogen Peroxide/chemistry ; Hydroxyl Radical/chemistry ; Kinetics ; Oxidation-Reduction ; Photolysis ; Ultraviolet Rays
    Chemical Substances Hydroxyl Radical (3352-57-6) ; Hydrogen Peroxide (BBX060AN9V) ; Benzene (J64922108F)
    Language English
    Publishing date 2013-02-14
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 1483376-1
    ISSN 1348-2246 ; 0910-6340
    ISSN (online) 1348-2246
    ISSN 0910-6340
    DOI 10.2116/analsci.29.377
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Solvent effect on copolymerization of maleimide with styrene induced by irradiation of ion and electron beams

    Nakagawa, Seiko / Taguchi, Mitsumasa / Kimura, Atsushi

    Radiation physics and chemistry. 2013 Oct., v. 91

    2013  

    Abstract: The radiation-induced polymerization of styrene with maleimide was studied in methanol, ethanol, and 2-propanol solutions by irradiation of electrons, protons, He and C-ions. The polymer yield increased in the order methanol, ethanol, and 2-propanol, ... ...

    Abstract The radiation-induced polymerization of styrene with maleimide was studied in methanol, ethanol, and 2-propanol solutions by irradiation of electrons, protons, He and C-ions. The polymer yield increased in the order methanol, ethanol, and 2-propanol, depending on the reactivity of the solvent radical to initiate the polymerization. Furthermore, the effect of the specific energy of the ions was observed in the methanol and ethanol solutions by ion irradiation at the dose rate of 20nA. Not only the radical distribution depending on the LET value or dose rate, but also the reactivity of the solvent radical to initiate the polymerization will influence the polymer yield and the distribution of the molecular weight.
    Keywords electrons ; ethanol ; ions ; irradiation ; isopropyl alcohol ; methanol ; molecular weight ; polymerization ; polymers ; protons ; solvents ; specific energy ; styrene
    Language English
    Dates of publication 2013-10
    Size p. 143-147.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2019621-0
    ISSN 1878-1020 ; 0969-806X ; 1359-0197 ; 0146-5724
    ISSN (online) 1878-1020
    ISSN 0969-806X ; 1359-0197 ; 0146-5724
    DOI 10.1016/j.radphyschem.2013.05.022
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  6. Article: LET and dose rate effect on radiation-induced copolymerization of maleimide with styrene in 2-propanol solution

    Nakagawa, Seiko / Taguchi, Mitsumasa / Kimura, Atsushi

    Radiation physics and chemistry. 2011 Nov., v. 80, no. 11

    2011  

    Abstract: N₂-saturated 2-propanol solutions containing styrene and maleimide were irradiated by electron, proton, He and C-ion beams. The styrene–maleimide copolymer was produced by radical polymerization induced during irradiation. The effects of the radical ... ...

    Abstract N₂-saturated 2-propanol solutions containing styrene and maleimide were irradiated by electron, proton, He and C-ion beams. The styrene–maleimide copolymer was produced by radical polymerization induced during irradiation. The effects of the radical distribution, which depends on the LET or dose rate, on the molecular weight and the polymer yield were discussed.
    Keywords composite polymers ; irradiation ; isopropyl alcohol ; molecular weight ; polymerization ; styrene
    Language English
    Dates of publication 2011-11
    Size p. 1199-1202.
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 2019621-0
    ISSN 1878-1020 ; 0969-806X ; 1359-0197 ; 0146-5724
    ISSN (online) 1878-1020
    ISSN 0969-806X ; 1359-0197 ; 0146-5724
    DOI 10.1016/j.radphyschem.2011.05.012
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  7. Article ; Online: A renoprotective effect of low dose losartan in patients with type 2 diabetes.

    Sawaki, Hideaki / Terasaki, Jungo / Fujita, Atsushi / Nakagawa, Seiko / Kanatsuna, Norio / Sadahiro, Katsuhiko / Isotani, Haruhiko / Imagawa, Akihisa / Hanafusa, Toshiaki

    Diabetes research and clinical practice

    2008  Volume 79, Issue 1, Page(s) 86–90

    Abstract: It has been reported that angiotensin II receptor blocker (ARB) improves proteinuria in diabetic patients. However, whether this is a direct effect of ARB or through lowering blood pressure is still controversial. The aim of this study is to determine ... ...

    Abstract It has been reported that angiotensin II receptor blocker (ARB) improves proteinuria in diabetic patients. However, whether this is a direct effect of ARB or through lowering blood pressure is still controversial. The aim of this study is to determine the direct effect of ARB on diabetic nephropathy. Thirty-four type 2 diabetic patients with early kidney damage were divided into two groups: losartan group (n=17) and control group (n=17). In losartan group, low dose (25mg) of losartan was administered once daily for a year. Blood pressure at home, blood pressure at office and urinary albumin/creatinine ratio (UACR) were measured before and during the treatment. After a 1-year observation, the increment of UACR was significantly smaller in losartan group than that in control group [-23.8+/-13.7 mg/gCr vs. 15.9+/-13.2mg/gCr, mean+/-S.E.M., P=0.0114]. Mean blood pressure levels did not change before and during the observation period both in losartan group and control group, though only systolic blood pressure at home decreased slightly but significantly. There were no significant differences in the levels of HbA(1c), fasting plasma glucose, total cholesterol, triglyceride and body mass index between the two groups. The observed decrease in UACR in the losartan-treated group might be attributed to a direct renoprotective action in addition to a subtle decrease in systolic blood pressure at home.
    MeSH term(s) Angiotensin II Type 1 Receptor Blockers/therapeutic use ; Antihypertensive Agents/therapeutic use ; Blood Pressure ; Body Mass Index ; Diabetes Mellitus, Type 2/complications ; Diabetic Nephropathies/prevention & control ; Female ; Humans ; Lipids/blood ; Losartan/therapeutic use ; Male ; Middle Aged ; Proteinuria/prevention & control
    Chemical Substances Angiotensin II Type 1 Receptor Blockers ; Antihypertensive Agents ; Lipids ; Losartan (JMS50MPO89)
    Language English
    Publishing date 2008-01
    Publishing country Ireland
    Document type Clinical Trial ; Journal Article
    ZDB-ID 632523-3
    ISSN 1872-8227 ; 0168-8227
    ISSN (online) 1872-8227
    ISSN 0168-8227
    DOI 10.1016/j.diabres.2007.08.004
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