• 한국환경과학회지
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• 제21권11호
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• pp.1297-1305
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• 2012

Clonal plants combine sexual and clonal reproduction, which contribute differently to plant fitness. Reproductive analyses have highlighted the importance of clonal growth in shaping the spatial genetic structure in Potentilla conferta Bunge, a herbaceous rhizomatic clonal distributed in hot sand dunes. We investigated the reproduction system of P. conferta at two populations in Mongol and three natural populations in Uzbekistan. The measurements of 19 quantitative or qualitative morphological characters were taken on each of total individuals directly from their natural habitats. Some morphological characteristics between Mongolia and Uzbekistan populations showed a slight heterogeneity of variance. Especially, the length of internodes (LFI and LSI) and characteristics of root (LLR and NOR) were shown a significant difference between two countries (P<0.05). P. conferta of Uzbekistan has most ramets at short distance intervals 30~100 cm. In light conditions, P. conferta of Uzbekistan was significantly less resilience than P. conferta of Mogol. In drought conditions, although there was not shown significant difference, P. conferta in Uzbekistan was less resilience than that in Mogol. The core analysis indicates that P. conferta in Uzbekistan is the more resistant than that of Mongol and seems to do by sexual reproduction strategy during several strong environmental disadvantages such as drought events.

• Toxicological Research
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• 제12권2호
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• pp.271-275
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• 1996

Carcinogenic potential of HPV-16 DNA and NNK in a human keratinocyte cell line was assessed to study effects of viral-chemical interaction. Human cells were transfected with HPV-16 DNA and 6 clonal cell lines were subsequently obtained. Clonal line-3 and 6 at passage 7 showed characteristics of tumor cells such as increases of saturation density, soft-agar colony formation, cell aggregation and foci appearance. Among cells treated with 1$\mu M$, 10$\mu M$, 100$\mu M$ or 1 mM of NNK for 4 weeks, 100$\mu M$ treatment showed most tumorigenic characteristics at passage 7. These results indicate that either HPV-16 or NNK alone is tumorigenic in this in human in vitro model. When cells transfected with HPV-16 were subsequently exposed by 100 uM NNK for 4 weeks, all the clonal cells except clone-1 showed higher levels of tumor cell characteristics than HPV-16 DNA or NNK exposure alone. Clonal line-6, the most tumorigenic cells, showed higher transcriptional level of fibronectin and lower level of TGF-$\beta_1$, as compared to control cells, suggesting that alteration of growth factor or extracellular matrix may play a role in carcinogenesis process induced by HPV-16 and NNK. Taken together, the present study indicates that viral-chemical interactions between HPV-16 DNA and NNK enhance carcinogenic potentials of human cells and implies that smoking among people infected with human papillomavirus may pose an additional risk of causing cancer.

• 한국어류학회지
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• 제20권1호
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• pp.1-6
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• 2008

제브라피쉬 배아로부터 확보한 세포주로부터 외부형태와 세포 크기에 따라 3종류의 동형세포주를 확립하였다. 활발하게 증식하는 안정된 세포주 및 이들로부터 확립된 동형세포주의 세포특성은 변하지 않고 지속적으로 유지되었으며, 안정된 세포주로부터 총 18개의 콜로니를 확보하여 배양한 다음 3종류의 동형세포주를 선별하여 세포 특성을 분석하였다. 대부분의 동형세포주는 약 80% 정도 정상적인 염색체(2N=50)를 가지고 있었으며 FACs 분석과 일치하였다. 배아로부터 확립된 동형세포주에 항체테스트 결과, vimentin에서 양성을 보이는 결과로 볼 때 확립된 세포주는 분화된 섬유세포임이 확인되었다. 이러한 결과는, 확립된 동형세포주를 이용한 유전자조작과 어류복제에의 활용도를 높일 수 있음을 시사한다.

• 한국수산과학회지
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• 제35권6호
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• pp.589-594
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• 2002

국내에 서식하는 붕어 (Carassius auratus) 3배체 집단을 동정하고 이들을 대상으로 분자생물학적, 세포유전학적 및 형태학적 특징을 분석하였다. 본 자연산 붕어 3배체 집단은 전형적인 3배체의 세포 유전학적 특성들, 즉 이배체에 비해 1.5배의 세포 및 핵의 크기, 3n=150의 염색체수, 그리고 2배체 (3.6pg/cell)에 비해 1.5배 증가된 DNA 함량 (5.4 pg/cell)을 나타내었다. 또한 본 3배 체붕어 집단은 DNA fingerprinting 분석에 의해 유전적인 구성이 동일한 클론 집단인 것으로 판명되었고 클론 3배체 붕어들은 2배체와 비교시 매우 일양한 형태학적 특성을 나타내었으며 모두 암컷인 전암컷 집단이었다. 본 연구의 분석에 사용된 함안 집단의 3배체 붕어 집단 이외에도 논산, 주문진, 속초 및 삼례 붕어 집단을 대상으로 3배체 출현 빈도를 조사한 결과, 모든 지역에서 $80\%$ 이상의 높은 3배체 빈도를 보였다.

• 대한음성언어의학회:학술대회논문집
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• 대한음성언어학회 2015년도 제42차 춘계학술대회
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• pp.19-19
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• 2015

• 농업생명과학연구
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• 제45권6호
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• pp.47-55
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• 2011

This study investigated mineral element concentrations of acorns in Quercus acutissima and Quercus serrata seed orchard, so that to estimate the variation of these species based on the chemical composition in different clones from plus trees. The acorns were collected from ten clones of each species grown in the same clonal seed orchard. The nutritional concentration of acorns was significantly different between the clones and species. The concentration of nutrient for the whole acorn followed in this general sequence: P > K > Na > Mg > Ca > Mn > Fe > Zn > Cu. The mineral concentrations of acorns in clones of Q. acutissima and Q. serrata contained P (494 to 684 and 541 to 672 mg/100 g), K (114 to 569 and 140 to 251 mg/100 g), Na (57 to 121 and 49 to 85 mg/100 g), Mg (29 to 37 and 26 to 42 mg/100 g), Ca (10 to 53 and 26 to 68 mg/100 g), Mn (0.5 to 3.4 and 1.8 to 4.5 mg/100 g), Fe (0.7 to 1.1 and 0.0 to 2.2 mg/100 g), Zn (0.34 to 0.81 and 0.38 to 0.84 mg/100 g), and Cu (0.13 to 0.40 and 0.09 to 0.34 mg/100 g) respectively. Even though acorns of Q. serrata are smaller in size than Q. acutissima, acorns of Q. serrata contained significantly higher concentration of phosphorus, calcium, iron and manganese than Q. acutissima. Based on the mineral composition of the acorns, this study has shown that the clones of Q. acutissima and Q. serrata have different ability to accumulate mineral nutrients which could indicate the variation of Quercus species in terms of mineral acquisition and accumulation.

• Journal of Ecology and Environment
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• 제43권3호
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• pp.320-331
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• 2019

Background: Dioecious plant species having both male and female plants have been investigated regarding sex-related characteristics such as sex ratio, sex-differential resource requirements, and spatial segregation of the sexes. Habitat loss and fragmentation are major threats to the survival of plant populations, but dioecious species are particularly more prone to such habitat degradation than non-dioecious species because of their dimorphic sexual system. We examined the sex-related demographics of two Ilex cornuta populations being different regarding land use history. Methods: During 2016-2017, we examined I. cornuta trees with a basal diameter ${\geq}1.5cm$ in the Yongsu-ri population (YS population) and the Gotjawal Provincial Park population (GP population). Plant sex (male, female, or unsexed) was identified. The tree size (basal diameter and height of the main stem), clonal production (the ramet numbers per genet), and vitality for each clone were measured. The associations between population, sex, tree size, clonal production, and vitality were examined using ANOVAs and contingency table analyses. Finally, point pattern analyses using O-ring statistics were conducted to assess spatial patterns. Results: Upon excluding unsexed trees, the YS population with 74 trees was significantly male-biased (0.66), while the GP population with only 26 trees had a 1:1 sex ratio. In both populations, males and females did not differ in tree size. Although the mean number of ramets differed significantly between populations, females tended to produce more ramets than males. The proportion of weak trees was significantly higher in the YS than in the GP population. Neither population showed evidence of spatial segregation of the sexes. Conclusions: The two populations of dioecious I. cornuta are characterized by the small number of trees and relatively high frequencies of non-reproductive trees. Both indicate that these populations are quite susceptible to environmental and genetic stochasticity. On the other hand, the differences between populations in sex ratio, clonal production, and vitality suggest that conservation efforts for I. cornuta need to be population-specific. In order to help recover and enable this vulnerable species to persist, it is necessary to find ways to enhance their sexual reproduction and simultaneously reduce habitat disturbances due to anthropogenic activities.

• Journal of Veterinary Science
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• 제21권1호
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• pp.2.1-2.14
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• 2020

The emergence of livestock-associated (LA)-methicillin-resistant Staphylococcus aureus (MRSA) in livestock animal has become a significant zoonotic concern. In the present study, we investigated nationwide prevalence of LA-MRSA across pork production chain including pig farms, slaughterhouses, and retail markets. A total of 40 MRSA strains were isolated during the investigation and the overall prevalence of MRSA was 3.4% (n = 37), 0.6% (n = 2), and 0.4% (n = 1) in pig farms, slaughterhouses, and retail markets, respectively. Multilocus sequence typing analyses revealed that the 2 most significant clonal lineages in pork production chain in Korea were ST398 (n = 25) and ST541 (n = 6). All of the 40 MRSA isolates were further characterized to investigate key genotypic and phenotypic correlates associated with the emergence and spread of clonal complex 398 (CC398; ST398, and ST541) LA-MRSA. Although the prevalence of swine-associated MRSA was still relatively low and mostly restricted to pig farms, multidrug-resistant CC398 LA-MRSA isolates with new spa types (t18102 and t18103) were identified as a major clonal lineage. The CC398 LA-MRSA strains tended to exhibit increased levels of multiple drug resistance (MDR) phenotype compared with non-CC398 MRSA strains. Of note, in comparison with non-CC398 MRSA isolates, CC398 LA-MRSA isolates exhibited significantly enhanced tetracycline (TET) and zinc resistance. These findings suggested that co-selection pressure associated with MDR phenotype, especially TET resistance, and zinc resistance may have played a significant role in the emergence and persistence of CC398 LA-MRSA in pig farms in Korea.

• 생명과학회지
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• 제17권9호통권89호
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• pp.1217-1223
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• 2007

한국의 솜양지꽃(Potentilla discolor) 9개 집단과 몽골의 양지꽃속 식물 종 P. conferta 두 집단을 이용하여 두 종의 생식계를 비교하였다. 분포지에서 19개 형태 형질을 조사하여 정량분석에 사용하였다. 형태 형질에서 두 종간 많은 형질에 대해 유의한 차이를 나타내었다. 주성분분석에서 마디간 길이와 뿌리의 길이와 개수 등에서 특히 유의한 차이를 나타내어 이들 두 종을 분류하는데 유의한 성분으로 판단된다. P. conferta에서 라메트의 수는 거리의 증가에 따라 현저하게 감소하나 P. discolor는 정규분포 모양의 곡선을 나타내어 $60{\sim}80$ cm에서 가장 많았다. 빛에 대한 감수성은 P. discolor가 P. conferta보다 내성을 가지나 가뭄에 대해서는 P. conferta가 P. discolor보다 더 높은 내성을 나타내었다 . 이는 사막에 근접한 건조한 지역에 적응한 형태로 판단되며 온대 지방인 우리나라에 분포하는 솜양지꽃에 비해 단위면적당 밀도가 높아 이웃간 거리가 짧아 짧은 라메트를 많이 가지며 라메트 수가 많아 영양번식이 더 많이 이루어지고 있음을 나타낸다.

• Asian Pacific Journal of Cancer Prevention
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• 제16권13호
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• pp.5159-5162
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• 2015

Background: Chronic myeloproliferative diseases are clonal stem cell diseases which occur as a result of uncontrollable growth and reproduction of hematopoietic stem cells, which are the myeloid series source in bone marrow. Recent studies have suggested that chronic inflammation can be a triggering factor in the clonal change in chronic myeloproliferative neoplasia (CMPN). In our study, we evaluated the existence of a chronic inflammation process in our Philadelphia negative (Ph-)CMPN patients using inflammation parameters in combination with demographic, laboratory and clinical characteristics of the patients. Materials and Methods: Demographic characteristics, clinical and laboratorial data, and thrombosis histories of 99 Ph-CMPN patients, who were diagnosed at our outpatient clinic of hematology in accordance with WHO 2008 criteria, were analyzed retrospectively,with 80 healthy individuals of matching gender and age included as controls. Complete blood counts, sedimentation, C reactive protein (CRP), JAK V617F gene mutations, abdomen ultrasound images and previous thrombosis histories of these patients were retrospectively analyzed. Results: Ph-CMPN and healthy control groups included 99 and 80 cases, respectively. PV, ET and MF diagnoses of patients were 43 (%43.4), 44 (44.4%) and 12 (12.1%), respectively. JAK V617F gene mutation was found to be positive in 64 (71.1%) of all cases and in 27(65.8%), 32 (82%), 5 (50%) of the cases in PV, ET and PMF groups, respectively. Thrombosis was determined as 12 (12%) in the entire group, 12.5% in the JAK V617F negative and 15.3% in the positive patients, with no statistical significance (p=0.758). No significant difference was observed between patients with and without previous thrombosis history in respect to hemogram parameters, sedimentation and CRP (p>0.05), neutrophil to lymphocyte ratio (NLR), erythrocyte distribution width (RDW), mean platelet volume (MPV) and sedimentation levels of the patient.