• Title/Summary/Keyword: Korean mint

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밀리미터파 응용기술

  • Park, Hyeon-Chang;Lee, Mun-Gyo;Kim, Sam-Dong;Lee, Jin-Gu
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.5
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    • pp.3-12
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    • 2008

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A Multivariate Statistical Approach to Comparison of Essential Oil Composition from Three Mentha Species

  • Park, Kuen-Woo;Kim, Dong-Yi;Lee, Sang-Yong;Kim, Jun-Hong;Yang, Dong-Sik
    • Horticultural Science & Technology
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    • v.29 no.4
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    • pp.382-387
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    • 2011

  • The chemical composition of essential oils obtained from aerial parts in spearmint, apple mint and chocolate mint, was investigated by gas chromatography/mass spectrometry analyses. (-)-Carvone (33.0%) was quantitatively major compound in spearmint, followed by R-(+)-limonene (11.7%) and ${\beta}$-phellandrene (9.7%); (-)-carvone (37.4%) and germacrene D (11.9%) in apple mint; and (-)-menthol (34.3%), p-menthone (18.4%) and menthofuran (9.8%) in chocolate mint. Hierarchical cluster analysis and principle components analysis showed the clear difference in chemical composition of the three mint oils.

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V-band CPW receiver chip set using GaAs PHEMT (GaAs PHEMT를 이용한 V-band CPW receiver chip set 설계 및 제작)

  • W. Y. Uhm;T. S. Kang;D. An;Lee, B. H.;Y. S. Chae;Park, H. M.;J. K. Rhee
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2002.11a
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    • pp.69-73
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    • 2002

  • We have designed and fabricated a low-cost, V-band CPW receiver chip set using GaAs PHEMT technology for the application of millimeter-wave wireless communication systems. Low noise amplifiers and down-converters were developed for this chip set. The fabricated low noise amplifier showed an S$\sub$21/ gain of 14.9 ㏈ at 60 ㎓ and a noise figure of 4.1 ㏈ at 52 ㎓. The down-converter exhibited a high conversion gain of 2 ㏈ at the low LO Power of 0 ㏈m. This work demonstrates that the GaAs PHEMT technology is a viable low-cost solution for V-band applications.

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DNA Methylation of Multiple Genes in Gastric Cancer: Association with CpG Island Methylator Phenotype and Helicobocter pylori Infection (위암에서 유전자 메틸화와 CpG Island Methylator Phenotype 및 Helicobacter pylori균 감염과의 연관성)

  • Jun, Kyong-Hwa;Won, Yong-Sung;Shin, Eun-Young;Cho, Hyun-Min;Im, Myoung-Goo;Chin, Hyung-Min;Park, Woo-Bae
    • Journal of Gastric Cancer
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    • v.6 no.4
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    • pp.227-236
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    • 2006

  • Purpose: Methylation of gene regulatory elements plays an important role in gene inactivation without genetic alteration. Gastric cancer is one of the tumors that exhibit a high frequency of CpG island hypermethylation. The purpose of this study was to investigate the occurrence of CpG island hypermethylation in gastric carcinoma in relation to H. pylori infection, CIMP and clincopathologic variables. Materials and Methods: We investigated the promoter methylation Status of six genes (hMLH1, p16, p14, COX-2, MGMT, E-cadherin) and CIMP in 36 gastric carcinoma tissues as well as in nontumor tissues. CIMP status was investigated by examining the methylation status of MINT 1, 2, 12, 25 and 31. The methylation status of the promoter was examined by methylation-specific PCR (MSP) and H. pylori infection was examined by histological diagnosis after staining with Warthin-Starry silver. Results: Among the 36 gastric carcinoma tissues, DNA hypermethylation was detected in the following frequencies: 14 (38.9%) for p14, 13 (36.1%) for p16, 8 (22.2%) for MGMT, 10 (27.8%) for COX-2, 21 (58.3%) for E-cadherin, and 6 (16.7%) for hMLH1. The frequencies for MINT1 and MINT25 hypermethylation were significantly higher in tumor tissues than in nontumor tissues. 16 (44.4%) of the 36 gastric carcinoma tissues were positive for the CIMP CIMP-H tumors were associated with older patients and larger tumor size than CIMP-L tumors. We found a significant association between the presence of the CIMP and hypermethylation of p16. Hypermethylation of p16 and MINT2 were significantly different when compared by age. MINT1 gene methylation was significantly associated with H. pylori infection (P=0.004). Conclusion: Our results suggest that aberrant hypermethylation of multiple tumor related genes (hMLH1, p16, p14, COX-2, MGMT, E-cadherin, MINT1, 2, 12, 25, 31) occurs frequently in gastric carcinoma tissues. The hypermethylation of MINT1 was significantly higher in the tumor tissues and was associated with H. pylori infection.

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