• 한국산림과학회지
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• 제96권4호
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• pp.425-431
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• 2007

Rhizina undulata의 PCR 검정 및 유전적 특성 분석을 목적으로, rDNA ITS 영역의 염기배열 해석 및 PCR 방법에 의한 토양으로부터 R. undulata의 진단법을 개발하였다. 18S rDNA 부분의 염기서열 분석 결과, 공시한 4종의 균주 모두 1,375 nt의 크기로 동일하였으며, 염기배열도 100% 일치하였다. 한편, rDNA ITS 영역의 염기배열은 585 nt이었고, PDK-1, PTT-1 및 PDJ-9 균주는 염기배열이 100% 동일하였으나, PDS-5균주에서는 두 곳에서 염기의 치환이 발견되었다. 이와 같은 염기배열을 분석하여 제작한 R. undulata rDNA ITS 영역 특이적 primer를 이용한 PCR 검정 결과, R. undulata 균주들에서만 약 525 bp 크기의 ITS 영역 특이적인 증폭산물이 검출되었다. PCR 방법에 의하여 검출할 수 있는 토양 중의 R. undulata 최소 균사량의 한계를 확인하기 위해서, 순수 배양한 R. undulata 균사현탁액을 순차 희석하여 100g의 사양토에 혼합한 다음, 농도별로 균사 혼합한 각각의 토양 시료로부터 추출한 total DNA의 PCR 증폭산물을 분석한 결과, PCR 방법에 의하여 100g의 토양 중에 1 ng의 R. undulata 균사가 함유되어 있는 경우까지 검출이 가능하였다.

• 유통과학연구
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• 제14권2호
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• pp.33-39
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• 2016

Purpose The purpose of this study is to investigate the impact of gender differences in DNA on consumer buying behavior both online and offline and other buying channels to find out effective sales promotion strategies of enterprises. Research design, data, and methodology - This study investigated the relation between chromosome and DNA, DNA and gene, and gene and human behavior of gender. The study shows generic characteristics have influence upon consumers' buying behavior and inclination, and examined the effects of genetic characteristics depending upon the difference of gender DNA upon consumers' buying behavior. Results - Precedent studies on genetics and ethology showed close relations between chromosome and DNA, DNA and gene, and gene and buying behavior of the gene. 'Hunting and protection', one of the genetic characteristics in men's DNA, had great influence upon the consumers' different buying behavior. Conclusion - Gender DNA difference in genetics and ethology disclosed fundamental reasons for the difference in buying behavior and inclination of men and women. It gives implications that marketing strategies of advertising and sales promotion should be made in different ways depending upon men and women.

• 한국독성학회:학술대회논문집
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• 한국독성학회 2003년도 추계학술대회
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• pp.160-160
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• 2003

Antioxidative potentials of estrogen and genistein were compared by measuring the degree of protection against plasmid DNA strand breakage induced by peroxyl free radicals using the DNA strand scission assay with pBR322 DNA. Genistein decreased DNA strand breakage by AAPH radical treatment at the all of three concentrations tested (0.5, 1.0, 1.5 $\mu\textrm{g}$/$m\ell$) with the range of 89.5% to 99.6%.(omitted)

• 미생물학회지
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• 제28권2호
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• pp.109-113
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• 1990

Mutator 기능을 가지는 플라스미드 pKM101과 이의 돌연변이체 pSL4를 DNA 수복능력이 다른 Esherichia coli B/r(phr, recA, uvrA, uvrB)균주들에 도입하여 돌연변이원인 UV와 MNNG에 대한 보호효과와 mutagenecity를 조사형ㅅ다. pKM101과 pLS4의 mutator 기능과 보호효과는 repair 기능에 따라 다르나 전반적으로 두 플라스미드의 UV와 MNNG에 대한 저향성과 돌연변이율을 증가시켰고 pLS4는 pKM101보다 그효과가 높았다. 이러한 pLS4와 pKM101의 기능적 차이는 이들 플라스미드의 mutator 유전자상에 일어난 변이에 의한 것이라고 생각되었다.

• 한국식품저장유통학회:학술대회논문집
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• 한국식품저장유통학회 2003년도 제23차 추계총회 및 국제학술심포지움
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• pp.152-152
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• 2003

As utilization of radiation in medicine, industry and biochemical research increases, the protection against radiation damage has become an important issue. Natural products such as herbal medicines are beginning to receive attention as modifiers on the radiation response. In the present study, the protective effect of a herb, Menthae Herba, against radiation-induced DNA damage was evaluated using alkaline single-cell gel electrophoresis (SCGE; comet assay) in the mouse peripheral blood Iymphocytes and the micronucleus formation test in the Chinese hamster ovary (CHO) cells. The tail moment, which was a marker of DNA damage in the SCGE, and the frequency of micronuclei was decreased in groups treated with Mentae Herba extract before exposure to 200 cGy of gamma-ray. We also confirmed its activities to scavenge DPPH and hydroxyl radicals. These experiments demonstrated that Menthae Herba was effective at reducing the radiation-induced damage of DNA and scavenging free radicals. It is plausible that scavenging of free radicals by Menthae Herba may have played an important role in providing the protection against the radiation-induced damage to the DNA. These results indicated that Menthae Herba might be a useful radioprotector and that radical scavenging appears to be one of the mechanisms of radiation protection.

• Journal of Radiation Protection and Research
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• 제45권1호
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• pp.11-15
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• 2020

Background: There have been various studies to investigate the mechanisms of DNA damage from low-energy electrons. To understand the mechanism of these strand breaks, it is necessary to investigate the dissociation mechanism of the DNA constituents, that is, bases, sugars, and phosphates. Materials and Methods: We studied the dissociation of thymine base upon interaction with low-energy electrons. For this experiment, thymine powder was pressed onto the indium base and irradiated by 5 eV electrons. Results and Discussion: Non-irradiated and irradiated thymine samples were compared and analyzed using the X-ray photoelectron spectroscopic technique to analyze the dissociation patterns of the molecular bonds after low-energy electron irradiation of thymine. Conclusion: With 5 eV electron irradiation, C-C and N-C = O bonds are the primary dissociations that occur in thymine molecules.

• Molecules and Cells
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• 제25권2호
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• pp.224-230
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• 2008

Ceramides are well-known second messengers that induce apoptosis in various kinds of cancer cells, and their effects are closely related to radiation sensitivity. Phytoceramides, the yeast counterparts of the mammalian ceramides, are also reported to induce apoptosis. We investigated the effect of a novel ceramide derivative, N-acetylphytosphingosine (NAPS), on the radiosensitivity of NCI-H460 human lung carcinoma cells and its differential cytotoxicity in tumor and normal cells. The combination of NAPS with radiation significantly increased clonogenic cell death and caspase-dependent apoptosis. The combined treatment greatly increased Bax expression and Bid cleavage, but not Bcl-2 expression. However, there was no effect on radiosensitivity and apoptosis in BEAS2B cells, which derive from normal human bronchial epithelium. Cell proliferation and DNA synthesis were significantly inhibited by NAPS in both NCI-H460 and BEAS2B cells, but only the BEAS2B cells recovered by 48h after removal of the NAPS. Furthermore, the NCI-H460 cells underwent more DNA fragmentation than the BEAS2B cells in response to NAPS. Our results indicate that NAPS may be a potential radiosensitizing agent with differential effects on tumor vs. normal cells.

• The Plant Pathology Journal
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• 제40권2호
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• pp.171-191
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• 2024

Identification of Helicotylenchus species is very challenging due to phenotypic plasticity and existence of cryptic species complexes. Recently, the use of rDNA barcodes has proven to be useful for identification of Helicotylenchus. Molecular markers are a quick diagnostic tool and are crucial for discriminating related species and resolving cryptic species complexes within this speciose genus. However, DNA barcoding is not an error-free approach. The public databases appear to be marred by incorrect sequences, arising from sequencing errors, mislabeling, and misidentifications. Herein, we provide a comprehensive analysis of the newly obtained, and published DNA sequences of Helicotylenchus, revealing the potential faults in the available DNA barcodes. A total of 97 sequences (25 nearly full-length 18S-rRNA, 12 partial 28S-rRNA, 16 partial internal transcribed spacer [ITS]-rRNA, and 44 partial cytochrome c oxidase subunit I [COI] gene sequences) were newly obtained in the present study. Phylogenetic relationships between species are given as inferred from the analyses of 103 sequences of 18S-rRNA, 469 sequences of 28S-rRNA, 183 sequences of ITS-rRNA, and 63 sequences of COI. Remarks on suggested corrections of published accessions in GenBank database are given. Additionally, COI gene sequences of H. dihystera, H. asiaticus and the contentious H. microlobus are provided herein for the first time. Similar to rDNA gene analyses, the COI sequences support the genetic distinctness and validity of H. microlobus. DNA barcodes from type material are needed for resolving the taxonomic status of the unresolved taxonomic groups within the genus.

• Journal of Nutrition and Health
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• 제49권5호
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• pp.277-287
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• 2016

본 연구는 제5기 2차년도 국민건강영양조사 결과를 활용하여 한식 식품군의 총 페놀 함량, in vitro 항산화활성 및 인체세포를 이용한 ex vivo DNA 손상 감소효과를 비교하고, 각 지표간의 상관성을 분석하며, 한식의 총 식사 항산화능에 대한 각 식품군의 기여도를 알아보기 위해 수행되었다. 제5기 2차년도 국민건강영양조사 결과를 바탕으로 한식의 식물성 식품을 10가지 식품군 (곡류, 과일류, 채소류, 견과류, 김치류, 해조류, 감자류, 버섯류, 두류, 오일류)으로 분류한 후 각 식품군별로 총 섭취량의 1% 이상 섭취한 식품 84종을 한식의 식물성 식품으로 최종 선정하였다. 각 식품군의 총 페놀함량을 측정하였고, DPPH radical scavenging assay, TEAC assay, $ORAC_{ROO{\cdot}}$ assay를 사용하여 in vitro 항산화능을 측정하였다. 한식의 식품군별 항산화능 (dietary antioxidant capacity, DAC)은 in vitro 항산화활성 평균값과 각 식품군의 1일 섭취량을 고려하여 계산하였고 한식 TDAC는 각 식품군의 DAC로의 합으로 구하였으며, TDAC에 대한 각 식품군 항산화능의 기여도를 평가하였다. 인체 임파구에서의 ex vivo DNA 손상 정도는 comet assay를 사용하여 평가하였다. 한식 식품군의 총 페놀함량은 버섯류, 과일류, 채소류, 해조류, 김치류 등의 순으로 높았으며, 3가지 in vitro 실험법을 평균한 식품군의 항산화활성 순위는 버섯류, 해조류, 채소류, 김치류, 과일류 등의 순이었다. 각 식품군의 항산화활성에 식품섭취량을 고려하여 계산한 한식의 TDAC에 대한 식품군의 항산화능 기여도는 곡류가 33.4%로 가장 높았으며, 과일류 (23.9%), 채소류 (12.7%), 김치류 (11.2%) 등의 순으로 나타났다. 인체 임파구에서 ex vivo DNA 손상 보호효과는 버섯류에서 가장 높았으며, 그 다음 채소류, 과일류, 해조류, 김치류의 순으로 나타났다. 각 식품군의 페놀함량과 in vitro 항산화 활성, 그리고 ex vivo DNA 보호효과의 순위가 비슷하게 나타났으며 각 지표간의 상관성은 매우 높았다. 한식 식품군 중 버섯류, 과일류, 채소류, 해조류에서 총 페놀함량과 항산화 활성, DNA 손상 보호효과가 높게 나타났다. 각 식품군의 총 페놀함량과 in vitro 항산화 활성, ex vivo DNA 보호효과 지표 간의 상관성은 매우 높았다. 한식의 TDAC에 대한 식품군별 항산화능 기여도는 곡류가 가장 높았고, 그 다음이 과일류, 채소류, 김치류의 순이었다. 이러한 결과는 앞으로 한식의 우수성을 항산화 측면에서 밝히는데 매우 중요한 기초자료로 활용될 수 있을 것이다.

• Journal of Microbiology and Biotechnology
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• 제25권4호
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• pp.526-536
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• 2015

Leptospirosis is a worldwide zoonotic disease caused by pathogenic Leptospira, a genus of which more than 250 serovars have been identified. Commercial bacterin vaccines are limited in that they lack both cross-protection against heterologous serovars and long-term protection. This study investigated in mice the immunogenicity of an anti-leptospirosis vaccine, using the outer membrane proteins LipL32 and Loa22 as antigens. The immunogenicity of this vaccine formulation was compared with those induced by vaccines based on LipL32 or Loa22 alone. A DNA-encapsulated chitosan nanoparticle was used for in vivo DNA delivery. Using a unique DNA plasmid expressing both lipL32 and loa22 for vaccination, higher antibody responses were induced than when combining plasmids harboring each gene separately. Therefore, this formulation was used to test the immunogenicity when administered by a heterologous prime (DNA)-boost (protein) immunization regimen. The specific antibody responses against LipL32 (total IgG and IgG1) and Loa22 (IgG1) were higher in mice receiving two antigens in combination than in those vaccinated with a single antigen alone. Although no significant difference in splenic CD4⁺ T cell proliferation was observed among all groups of vaccinated mice, splenocytes from mice vaccinated with two antigens exhibited higher interferon-γ and IL-2 production than when using single antigens alone upon in vitro restimulation. Taken together, the immunogenicity induced by LipL32 and Loa22 antigens in a heterologous primeboost immunization regimen using chitosan as a DNA delivery system induces higher immune response, and may be useful for developing a better vaccine for leptospirosis.