• Title/Summary/Keyword: Pyro

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Studies on Selective Modulators and Antianorexigenic Agents in Korean Red Ginseng (고려홍삼에 함유된 선택조절제 및 항식욕감퇴 인자에 관한 연구)

  • Takaku Takeshi;Kameda Kenji;Matsuura Yukinaga;Sekiya Keizo;Okai Hideo;Okuda Hiromichi
    • Proceedings of the Ginseng society Conference
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    • 1988.08a
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    • pp.28-32
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    • 1988

  • Recently, we isolated a toxic substance named 'toxohormone-L' from ascites fluid of patients with various malignant tumors. The toxohormone-L stimulated lipolysis in rat adipocytes and induced anorexia in rats. Both the lipolytic and the anorexigenic actions of toxohormone-L were found to be inhibited by ginsenoside $Rb_2$ in Korean red ginseng. Isolated rat adipocytes are well known to possess opposite pathways of lipid metabolism: lipolysis and lipogenesis. Both of the metabolism respond to various biologically active substances such as epinephrine, ACTH and insulin. Epinephrine and ACTH stimulate lipolysis and insulin accelerates lipogenesis. Recently. Korean red ginseng powder was found to contain adenosine and an acidic substance which inhibited epinephrine-induced lipolysis and stimulated insulin-mediated lipogenesis from added glucose. The chemical structure of this acidic substance is determined to be pyro-glutamic acid (Pyro-Glu), Pyro-Glu exhibits selective modulations toward the opposite metabolic pathways in rat adipocyte; It inhibits the lipolysis but stimulates the lipogenesis. We call these substances (adenosine, Pyro-Glu) 'selective modulators' or 'insulin-like substances'. Based on these results, physiological significances of these substances in Korean red ginseng were discussed.

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Proposals for Revising the Occupational Exposure Limits for Aluminum in Korea (국내 알루미늄 노출실태 및 노출기준 개정 제안)

  • Seung Won Kim;Young Gyu Phee;Yong-Joon Baek;Taejin Chung;Hye-Sil Lee
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.34 no.1
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    • pp.85-97
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    • 2024

  • Objectives: This study was intended to investigate the revision status of the occupational exposure standards for aluminum at home and abroad; to investigate worker exposure at domestic aluminum manufacturing and handling workplaces; to conduct social and economic evaluation for the revision of domestic aluminum exposure limits. Methods: We investigated the current status of occupational exposure limits for aluminum at home and abroad, and analyzed supporting data. An exposure survey was conducted targeting domestic aluminum manufacturing and handling workplaces. Based on these, revised aluminum occupational exposure limits were proposed. Results: The major aluminum exposure limits at home and abroad show a notable difference. The toxicity of aluminum, which was revealed through animal experiments and epidemiological investigations. The average concentration of aluminum in the air at 12 workplaces was 0.016 mg/m3, and the maximum was 0.0776 mg/m3. When total dust and respiratory dust were measured side by side and simultaneously for the same process, 12.1% of the total mass concentration of aluminum dust was respiratory dust. As a result of measuring and comparing the size distribution of dust with an optical particle counter in real time, 48.1% of the total dust in the form of welding fume and pyro-powder was respiratory dust. Based on the literature review and workplace survey, three proposals for changing the aluminum exposure limit were proposed. Proposal (1): For all types, 10 mg/m3 is unified as the exposure limit except for soluble salts and alkyls. Proposal (2): 1(R) mg/m3 as the exposure limit for all forms except soluble salts and alkyl. Proposal (3): 1(R) mg/m3 for pyro-powder and welding fume, and 10 mg/m3 for metal dust, aluminum oxide, and insoluble compounds as exposure standards. A pyro-powder was defined as dry aluminum powder of 200 mesh size (74 ㎛) or smaller (larger size classified as metal dust). Reason for setting: In the workplace survey, the ratio of respiratory dust to total dust was analyzed to be about 1:10, so it was judged that the domestic standard and the ACGIH standard were compatible. Conclusions: In all scenarios according to the revision of the exposure standard, the B/C ratio was greater than 1 or only benefits existed, so it was evaluated as sufficiently reasonable as a result of the socio-economic evaluation.

  • https://doi.org/10.15269/JKSOEH.2024.34.1.85 인용 PDF

Quality Assurance of Head-end Process of PYRO

  • Kang, Kweon Ho;Cho, Yung Jun;Hong, Seok-Min;Lee, Jae Won;Kim, Young Hwan;Lee, Ju Ho;Lee, Do Youn;Lee, Young Soon;Yoon, Joo Young
    • Proceedings of the Korean Radioactive Waste Society Conference
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    • 2018.11a
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    • pp.618-619
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    • 2018

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