• Title/Summary/Keyword: Energy Technology

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Effects of ${\gamma}$-Irradiation on Immunological Activities of ${\beta}$-Glucan

  • Kim, Jae-Hun;Sung, Nak-Yun;Byun, Eui-Hong;Kwon, Sun-Kyu;Song, Beom-Seok;Choi, Jong-Il;Yoon, Yohan;Kim, Jin-Kyu;Byun, Myung-Woo;Lee, Ju-Woon
    • Food Science and Biotechnology
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    • v.18 no.5
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    • pp.1305-1309
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    • 2009

  • This study evaluated the effects of $\gamma$-irradiation on immunomodulating properties and structural changes of ${\beta}$-glucan. ${\beta}$-Glucan solutions (10 mg/mL) were ${\gamma}$-irradiated at 10, 30, and 50 kGy. Splenocyte proliferation and cytokine (interferon-${\gamma}$ and interlukin-2) productions by ${\gamma}$-irradiated ${\beta}$-glucan were evaluated in in vivo and in vitro, and structural changes of ${\beta}$-glucan were also determined after ${\gamma}$-irradiation. ${\gamma}$-Irradiation on ${\beta}$-glucan at 50 kGy enhanced splenocyte proliferation and cytokine productions, (p<0.05) and cleft glycosidic bonds of ${\beta}$-glucan resulting in lower the molecular weight. These results indicate that the use of ${\gamma}$-irradiation on ${\beta}$-glucan may be useful for improving its immunological activity by lowering the molecular weight of ${\beta}$-glucan.

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Simulation of the irradiation effect on hardness of Chinese HTGR A508-3 steels with CPFEM

  • Nie, Junfeng;Lin, Pandong;Liu, Yunpeng;Zhang, Haiquan;Wang, Xin
    • Nuclear Engineering and Technology
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    • v.51 no.8
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    • pp.1970-1977
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    • 2019

  • Understanding the irradiation hardening effect of structural steels under various irradiation conditions plays an important role in developing advanced nuclear systems. Such being the case, a crystal plasticity model for body-centered cubic (BCC) crystal based on the density of dislocations and irradiation defects is summarized and numerically implemented in this paper. Based on this model, nano-indentation hardness of Chinese A508-3 steels with ion irradiation is calculated. Very good agreement is observed between simulation and experimental data of several different irradiation doses subjected to various operating temperatures, from which, it can be concluded that indentation hardness increases with increasing irradiation dose at both room temperature and high temperature. Consequently, the validity of this model has been proved properly, and furthermore, the model established in this paper could guide the study of irradiation hardening effect and temperature effect to some extent.

  • https://doi.org/10.1016/j.net.2019.06.015 인용 PDF KSCI

Microbiological and Sensory Characteristics of Gamma-irradiated Frozen Bibimbap (감마선 조사 냉동비빔밥의 미생물 및 관능적 품질특성)

  • Park, Jae-Nam;Song, Beom-Seok;Yoon, Young-Min;Choi, Soo-Jeong;Park, Jong-Heum;Kim, Jae-Kyung;Byun, Eui-Baek;Lee, Ju-Woon;Han, In-Jun;Sohn, Hee-Sook;Kim, Jae-Hun
    • Journal of Radiation Industry
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    • v.7 no.2_3
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    • pp.93-99
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    • 2013

  • This study was conducted to evaluate the effect of gamma irradiation on the microbiological and sensory characteristics of frozen Bibimbap. Frozen Bibimbap vegetables were contaminated by microbial levels of $2.70{\sim}6.67log\;CFU\;g^{-1}$ in total aerobic bacteria. Frozen Bibimbap was contaminated by microbial levels of $4.8log\;CFU\;g^{-1}$ in total aerobic bacteria, but microorganisms in gamma-irradiated samples at above 25 kGy were not found at detection limit less then $1log\;CFUg^{-1}$. Sensory characteristics of the gamma-irradiated Bibimbap were decreased depending upon the irradiation dose, and sensory scores of the samples irradiated with doses higher than 10 kGy were significantly decreased. Therefore, the application of combination of the various food processing technology should be considered for the sterilization of Bibimbap, without any deterioration of quality occurred by high dose irradiation.