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Oshima, Takeshi; Yokoseki, Takashi; Murata, Koichi; Matsuda, Takuma; Mitomo, Satoshi; Abe, Hiroshi; Makino, Takahiro; Onoda, Shinobu; Hijikata, Yasuto*; Tanaka, Yuki*; et al.
Japanese Journal of Applied Physics, 55(1S), p.01AD01_1 - 01AD01_4, 2016/01
Times Cited Count：15 Percentile：54.09(Physics, Applied)Wada, Yuki*; Tamada, Masao; Seko, Noriaki; Mitomo, Hiroshi*
Journal of Applied Polymer Science, 107(4), p.2289 - 2294, 2008/02
Times Cited Count：14 Percentile：41.05(Polymer Science)Vinyl acetate (VAc) was grafted onto poly(3-hydroxybutyrate) (PHB) film by preirradiation method. Grafting reactions were carried out in a VAc/water/surfactant emulsion, VAc/water, and VAc/methanol systems. For emulsion grafting, Nonion L-4 was ascertained to be the optimum surfactant with regard to the stability of a single emulsion layer. The emulsion with a 10:1 (w/w) ratio of VAc and surfactant yielded the highest degree of grafting (Xg) 23%. The grafting efficiency in the emulsion and the water and methanol solvent were evaluated. The results indicated that the grafting efficiency of the emulsion is 100 times that of VAc/methanol when the same 2 wt% VAc was used in the grafting reaction.
Wada, Yuki; Seko, Noriaki; Nagasawa, Naotsugu; Tamada, Masao; Kasuya, Kenichi*; Mitomo, Hiroshi*
Radiation Physics and Chemistry, 76(6), p.1075 - 1083, 2007/06
Times Cited Count：21 Percentile：78.36(Chemistry, Physical)Radiation-induced graft polymerization of vinyl acetate (VAc) onto poly(3-hydroxybutyrate) (PHB) film was carried out. At a degree of grafting higher than 5%, the grafted films (PHB-g-VAc) completely lost the enzymatic degradability that is characteristic of PHB due to the grafted VAc covering the surface of the PHB film. However, the biodegradability of the PHB-g-VAc films was recovered when the films were saponified in alkali solution under optimum conditions. Graft chains of the PHB-g-VAc film reacted selectively to become biodegradable polyvinyl alcohol (PVA). The biodegradability of the saponified PHB-g-VAc film increased rapidly with time.
Quynh, T. M.*; Mitomo, Hiroshi*; Nagasawa, Naotsugu; Wada, Yuki; Yoshii, Fumio; Tamada, Masao
European Polymer Journal, 43(5), p.1779 - 1785, 2007/05
Times Cited Count：119 Percentile：94.77(Polymer Science)Crosslinked materials derived from poly(lactide) (PLA) have been produced by radiation modification in the presence of a suitable crosslinker (triallyl isocyanurate: TAIC). The crosslinking structure introduced in PLA films has not only much improved the heat stability but also their mechanical properties. The properties of crosslinked samples are governed by crosslinking density and these improvement seemed to increase with radiation dose. This implied that the three dimensional networks have been introduced in material by radiation and the crosslinking density depended on the structure and length of PLA chains. Biodegradability of PLA was also determined by an enzymatic degradation test and burying in compost at 55 
C. Differing with PLLA, PDLA was insignificantly degraded by 
. The degradation rate of PLA in compost was postponed with the introduction of crosslinks.
Sghaier, H.; Narumi, Issei; Sato, Katsuya; Oba, Hirofumi; Mitomo, Hiroshi*
Theory in Biosciences, 126(1), p.43 - 45, 2007/03
Times Cited Count：15 Percentile：84.13(Biology)no abstracts in English
Nagasawa, Naotsugu; Kaneda, Ayako*; Matsuzaki, Tomoaki*; Kanazawa, Shinichi*; Yagi, Toshiaki; Tran, M. Q.*; Mitomo, Hiroshi*; Yoshii, Fumio; Tamada, Masao; Quynh, T. M.*
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 53, 2007/02
Poly(L-lactic acid), PLA was irradiated using electron beams (EB) in the presence of polyfunctional monomers (PFM) as crosslinking agent. Among the PFMs, triallyl isocyanurate (TAIC) at 3% concentration was found to be the most effective for crosslinking of PLA by irradiation technique. The crosslinked PLA obtained has heat resistance higher than 200C. From this fact, the crosslinked PLA is applied on heat-shrinkable tube, cup and plate. The shrinkable tube has several advantages such as high heat resistance and transparency. It is therefore proven that crosslinking technology is beneficial to expanding the application of PLA.
Nagasawa, Naotsugu; Wasikiewicz, J. M.*; Seko, Noriaki; Yagi, Toshiaki; Zhao, L.*; Mitomo, Hiroshi*; Yoshii, Fumio; Tamada, Masao
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 52, 2007/02
Radiation crosslinking of chitin / chitosan derivatives such as carboxymethylchitin (CMCt) and carboxymethylchitosan (CMCts) has been investigated. CMCt and CMCts of 40% concentration were irradiated by electron beams. The maximum gel fraction of those CMCht and CMChts reached 72% (75kGy) and 50% (100kGy) respectively. These gels absorpted water of 8.3g for CMCt and 21.2g for CMCts per 1 g of the dried gel. The absorption ability of various metal ions with these gels has been investigated. The highest adsorption of scandium and gold has been obtained for CMCt and CMCts gels, respectively.
Wada, Yuki; Mitomo, Hiroshi*; Seko, Noriaki; Tamada, Masao
JAEA-Review 2006-042, JAEA Takasaki Annual Report 2005, P. 51, 2007/02
no abstracts in English
Wada, Yuki; Mitomo, Hiroshi*; Kasuya, Kenichi*; Nagasawa, Naotsugu; Seko, Noriaki; Katakai, Akio; Tamada, Masao
Journal of Applied Polymer Science, 101(6), p.3856 - 3861, 2006/09
Times Cited Count：22 Percentile：54.20(Polymer Science)Radiation-induced graft polymerization of acrylic acid (AAc) on the surface of poly(3-hydroxybutyric acid) (PHB) film was carried out by applying pre-irradiation techniques. The PHB films grafted with AAc (PHB-g-AAc) possessed a degree of grafting higher than 5% have completely lost the enzymatic degradability. The enzymatic degradability of the grafted film was recovered by remolding. And the highest enzymatic degradation rate was observed to grafted films with AAc 10% of degree. Difference of enzymatic degradability of PHB-g-AAc film was caused by decrement of amount of enzyme contact and decrement of crystallinity of PHB by remolding.
; It started out as a radiation resistant organismSghaier, H.; Mitomo, Hiroshi*; Narumi, Issei
Viva Origino, 33(4), p.243 - 257, 2005/12
Previously, analyses of ionizing-radiation-sensitive mutants of and investigation into the genomic expression profile of the wild-type organism indicated a positive correlation between radiation resistance and desiccation tolerance phenotypes. Mainly because a terrestrial selective force for acquiring resistance to ionizing radiation was unfound, it has been assumed that the radiation resistance of 
is an incidental phenotype due to its anhydrobiosis defense abilities. Here, following the stratification of the genome, we discuss these issues from evolutionary, genomic, and experimental perspectives. Through the data collected we propose a reconciliatory model wherein radiation resistance is a unique molecular reflection of the early Earth resilience and desiccation tolerance is a mark of cells that colonized land during the Archaean epoch.
Nagasawa, Naotsugu; Kaneda, Ayako*; Kanazawa, Shinichi*; Yagi, Toshiaki; Mitomo, Hiroshi*; Yoshii, Fumio; Tamada, Masao
Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.611 - 616, 2005/07
Times Cited Count：81 Percentile：97.78(Instruments & Instrumentation)no abstracts in English
Wasikiewicz, J. M.; Nagasawa, Naotsugu; Tamada, Masao; Mitomo, Hiroshi*; Yoshii, Fumio
Nuclear Instruments and Methods in Physics Research B, 236(1-4), p.617 - 623, 2005/07
Times Cited Count：59 Percentile：95.43(Instruments & Instrumentation)The absorption ability of various metal ions into EB - radiation crosslinked carboxymethylchitin and carboxymethylchitosan has been investigated. The highest adsorption of Scandium and Gold has been obtained for carboxymethylchitin (CMCht) and carboxymethylchitosan (CMChts), respectively. Kinetic studies showed that adsorption of most of the metal ions occur in a relatively short period of time (2 hours). Detail investigation of adsorption of gold ions has been carried out for both hydrogels. The maximum uptake of Au cations, based on Langmuir equation was determined to be 37.59 mg/g for CMChts and 11.86 mg/g for CMCht. Both hydrogels indicate favorable adsorption of gold cations.
-lactic acid) by radiation-induced crosslinkingMitomo, Hiroshi*; Kaneda, Ayako*; Tran, M. Q.*; Nagasawa, Naotsugu; Yoshii, Fumio
Polymer, 46(13), p.4695 - 4703, 2005/06
Times Cited Count：118 Percentile：94.06(Polymer Science)no abstracts in English
Zhao, L.; Mitomo, Hiroshi*; Yoshii, Fumio; Kume, Tamikazu
Journal of Applied Polymer Science, 91(1), p.556 - 562, 2004/01
Times Cited Count：20 Percentile：53.37(Polymer Science)no abstracts in English
Zhao, L.; Mitomo, Hiroshi*; Yoshii, Fumio; Kume, Tamikazu
Journal of Applied Polymer Science, 91(1), p.556 - 562, 2004/01
no abstracts in English
Zhao, L.; Mitomo, Hiroshi*; Zhai, M.*; Yoshii, Fumio; Nagasawa, Naotsugu; Kume, Tamikazu
Carbohydrate Polymers, 53(4), p.439 - 446, 2003/09
Times Cited Count：209 Percentile：99.06(Chemistry, Applied)no abstracts in English
Zhao, L.; Mitomo, Hiroshi*; Nagasawa, Naotsugu; Yoshii, Fumio; Kume, Tamikazu
Carbohydrate Polymers, 51(2), p.169 - 175, 2003/01
Times Cited Count：118 Percentile：96.42(Chemistry, Applied)no abstracts in English
Suhartini, M.; Mitomo, Hiroshi*; Nagasawa, Naotsugu; Yoshii, Fumio; Kume, Tamikazu
Journal of Applied Polymer Science, 88(9), p.2238 - 2246, 2003/00
Times Cited Count：47 Percentile：79.68(Polymer Science)no abstracts in English
Wach, R. A.*; Mitomo, Hiroshi*; Yoshii, Fumio; Kume, Tamikazu
Macromolecular Materials and Engineering, 287(4), p.285 - 295, 2002/04
Times Cited Count：58 Percentile：85.14(Materials Science, Multidisciplinary)no abstracts in English
Suhartini, M.; Mitomo, Hiroshi*; Yoshii, Fumio; Nagasawa, Naotsugu; Kume, Tamikazu
Journal of Polymers and the Environment, 9(4), p.163 - 171, 2001/10
Times Cited Count：25 Percentile：65.63(Engineering, Environmental)no abstracts in English
