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Phytochemical constituents from the leaves of Sageretia theezans Brongn
Hanna Cha,Yeon Woo Jung,Wonsik Jeong,Ji Eun Lee,Dong Woo Han,Gwang Hun Park,Youngki Park,Sang-Hyun Koh,Chun Whan Choi,Seong Su Hong 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
Sageretia theezans, commonly known as Chinese bird plum, is an evergreen tender shrub of the Rhamnaceae family. In Korea, it grows along the southern seashore areas, and traditionally the leaves have been used as tea materials. Although S. theezans is widely used to create bonsais, it has been used in traditional herbal medicine for the treatment of hepatitis and fevers in Korea and China. S. theezans has been reported to show various pharmacological activities for neuroprotective, hepatoprotective and anti-oxidant. However, there have been only a few chemical composition studies of S. theezans so far. In this study, phytochemicals (1-11) were isolated from the ethanol extract of S. theezans leaves using different chromatographic techniques, and the chemical structures of isolates were elucidated as anthraquinone glycoside (1), five myricetin glycosides (2-6), three quercetin glycosides (7-9), a flavanol (10), and a simple phenolic compound (11) by NMR and mass analysis, and comparison to the literature. To the best our knowledge, compounds 1, 5, and 10 were obtained from the genus Sageretia for the first time.
아파트 외장색채 평가를 위한 감성어휘 추출에 관한 연구
김한나(Hanna Kim),차정훈(Junghoon Cha),전보혁(Bohyeok Jeon),이진숙(Jinsook Lee) 한국색채학회 2012 한국색채학회 학술대회 Vol.2012 No.11
아파트 외장색채 평가를 위한 감성어휘 추출을 목적으로 브랜드별 매뉴얼 컬러를 활용하여 자유배색을 통해 연상되는 어휘 148개를 수집하고, 전문가의 검증을 거쳐 총 73개의 색채 평가 어휘를 선정하였다. 이를 토대로 최근 5년 이내에 완공된 27개의 아파트 외장 색채를 평가하였고, 평가 어휘의 구조를 분석하고자 다차원척도법을 활용하여 평가어휘 간 유클리디안 거리 모형을 제시하였으며, 선정된 73개의 평가어휘를 ‘화려한’, ‘전원적인’, ‘고급스러운’, ‘도회적인’, ‘산뜻한’의 그룹으로 분류하였다.
MARGINAL TISSUE RESPONSE TO DIFFERENT IMPLANT NECK DESIGN
Bae, Hanna-Eun-Kyong,Chung, Moon-Kyu,Cha, In-Ho,Han, Dong-Hoo The Korean Academy of Prosthodonitics 2008 대한치과보철학회지 Vol.46 No.6
STATEMENT OF PROBLEM: Loss of the marginal bone to the first thread have been accepted but continuous effort have been made to reduce this bone loss by varying implant design and surface texture. PURPOSE: This animal study has examined the histomorphometric variations between implants with micro-thread, micro-grooved and turned surfaced neck designs. MATERIAL AND METHODS: Four mongrel dogs have been used the premolars removed and left to heal for three months. One of each implant systems with turned neck, micro-thread and micro-grooved were placed according to the manufacturers’protocol and left submerged for 8 and 12 weeks. These were then harvested for histological examination. RESULTS: The histologically all samples were successfully ossointegrated and active bone remodelling adjacent to implants. With the micro-grooved implants 0.40 mm and 0.26 mm of the marginal bone level changes were observed at 8 and 12 weeks respectively. The micro-threaded implants had changes of 0.79 mm and 0.56 mm at 8 and 12 weeks respectably. The turned neck designed implants had marginal bone level changes of 1.61 mm and 1.63 mm in 8 and 12 weeks specimens. A complex soft tissue arrangement could be observed against micro-threaded and micro-grooved implant surfaces. CONCLUSION: Within the limitations of this study, it could be concluded that implants with micro-grooved had the least and the turned neck designed implants had the most changes in the marginal bone level. The textured implant surfaces affect soft tissue responses.
Sphingomonas abietis sp. nov., an Endophytic Bacterium Isolated from Korean Fir
Jiang Lingmin,Choe Hanna,Peng Yuxin,Jeon Doeun,Cho Donghyun,Jiang Yue,Lee Ju Huck,Kim Cha Young,Lee Jiyoung 한국미생물·생명공학회 2023 Journal of microbiology and biotechnology Vol.33 No.10
PAMB 00755T , a bacterial strain, was isolated from Korean fir leaves. The strain exhibits yellow colonies and consists of Gram-negative, non-motile, short rods or ovoid-shaped cells. It displays optimal growth conditions at 20°C, 0% NaCl, and pH 6.0. Results of 16S rRNA gene-based phylogenetic analyses showed that strain PAMB 00755T was most closely related to Sphingomonas chungangi MAH-6T (97.7%) and Sphingomonas polyaromaticivorans B2-7T (97.4%), and ≤96.5% sequence similarity to other members of the genus Sphingomonas. The values of average nucleotide identity (79.9–81.3%), average amino acid identity (73.3–75.9%), and digital DNA–DNA hybridization (73.3– 75.9%) were significantly lower than the threshold values for species boundaries; these overall genome-related indexes (OGRI) analyses indicated that the strain represents a novel species. Genomic analysis revealed that the strain has a 4.4-Mbp genome encoding 4,083 functional genes, while the DNA G+C content of the whole genome is 66.1%. The genome of strain PAMB 00755T showed a putative carotenoid biosynthetic cluster responsible for its antioxidant activity. The respiratory quinone was identified as ubiquinone 10 (Q-10), while the major fatty acids in the profile were identified as C18:1ω7c and/or C18:1ω6c (summed feature 8). The major polar lipids of strain PAMB 00755T were diphosphatidylglycerol, phosphatidylethanolamine, sphingoglycolipid, and phosphatidylcholine. Based on a comprehensive analysis of genomic, phenotypic, and chemotaxonomic characteristics, we proposed the name Sphingomonas abietis sp. nov. for this novel species, with PAMB 00755T as the type strain (= KCTC 92781T = GDMCC 1.3779T ).
Yeon Woo Jung,Hanna Cha,Wonsik Jeong,Ji Eun Lee,Dong Woo Han,GwangHun Park,Youngki Park,Sang-Hyun Koh,Chun Whan Choi,Seong Su Hong 한국분석과학회 2021 학술대회논문집 Vol.2021 No.11
Previous phytochemical and pharmacological studies of the fruit of Sageretia theezans (Rhamnaceae) led to the isolation of a small number of anthocyanins and it having antioxidant activity. However, to date, no more study has been carried out to investigate the secondary metabolites from the fruit of S. theezans. In this phytochemical research of S. theezans fruit led to the isolation of a new flavone glycoside, sageretizanin (1) together with four quercetin derivatives (2-5), five kaempferol derivatives (6-10), two myricetin derivatives (11 and 12), and four flavanones (13-16). The structures of the isolated compounds were identified on the basis of their NMR spectroscopic (1H, 13C, DEPT, COSY, HSQC, HMBC, and ESI-MS) data and comparison with literature data. To the best of our knowledge, compounds 7 and 13-16 were obtained from the genus Sageretia for the first time. Moreover, compounds 7 and 13 has not been reported in the family of Rhamnaceae. Among them, (-)-aromadendrin-7-O-glucoside (7) was isolated for the second time from natural sources.