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성태연,G. R. Booker,A. G. Norman,F. Glas,G. B. Stringfellow 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.2
We have investigated the modulated structures and its associated diffracted diffuse intensity, of organometallic vapor phase epitaxially grown GaPSb (001) layers by using transmission electron microscopy (TEM) and transmission electron diffraction (TED). The TEM results reveal the co-existence of a fine-scale modulated contrast and a fine-scale speckled contrast. In addition, a fine needle-like contrast is observed. The [001] TED results show lines of [110]-oriented diffuse intensity diffuse streaks passing through the fundamental reflections, satellite spots at 1/4g[220] positions, and a [010]-oriented diffuse intensity with spacing of 1/6g[040]. Simulations using the Valence Force Field model were performed to understand the origin of the diffracted features. The observed distributions of diffuse intensity are shown to be partially consistent with random disorder. Furthermore, the [110]-oriented diffuse lines are attributed to a static displacement of the sites of the mixed sublattices.
Aldose reductase inhibition of Rosa hybrida petals and its active component, kaempferol
Norman G. Quilantang,Carlo A. Limbo,이주성,Sonia D. Jacinto,Sung-Kwon Moon,Sanghyun Lee 한국원예학회 2020 Horticulture, Environment, and Biotechnology Vol.61 No.3
The aldose reductase inhibitory activity of extracts from Rosa hybrida petals was evaluated, and a bioactive fl avonoid,kaempferol, was isolated from petals via bioassay-guided isolation. Kaempferol was isolated from the ethyl acetate fractionof R. hybrida and was shown to exhibit strong inhibition against aldose reductase (IC 50 = 0.02 μM). Quantitative analyses ofkaempferol in R. hybrida petals, diff erent fl ower parts, and diff erent Rosa species were also performed using high-performanceliquid chromatography. This study is the fi rst to establish that R. hybrida contains kaempferol and that the light-pinkpetals of this edible rose species exhibit the highest content of the naturally occurring aldose reductase inhibitor. The resultsof this study suggested the potential role of R. hybrida petals in the treatment and management of diabetic complicationsvia aldose reductase inhibition.
Macharistol, a New Cytotoxic Cinnamylphenol from the Stems of Machaerium aristulatum
Seo, Eun-Kyoung,Kim, Nam-Cheol,Mi, Qiuwen,Chai, Heebyung,Wall, Monroe E.,Wani, Mansukh C.,Navarro, Herna´n A.,Burgess, Jason P.,Graham, James G.,Cabieses, Fernando,Tan, Ghee T.,Farnsworth, Norman R.,P 梨花女子大學校 藥學硏究所 2001 藥學硏究論文集 Vol.- No.10
A new clnnamylphenol, machaistol(1), along with a known pterocarpan, (+)-medicarpin(2), were isolated as cytotoxic constituents from the stems of Machaerium aristulatum. In addition, a known pterocarpan, (+)-maackiain(3), and a known isoflavone, formononetin(4), were identified as inactive constituents. Compound 1 was eveluated in the in vivo hollow fiber assay with KB, Col-2, and hTERT-RPE1 cells and found to be inactive at the highest does(25 mg/kg body weight) tested.
Reaction Centre Quenching of Excess Light Energy and Photoprotection of Photosystem 2
( Alexander G. Ivanov ),( Vaughan Hurry ),( Prafullachandra V. Sane ),( Gunnar Oquist ),( Norman P. A. Huner ) 한국식물학회 2008 Journal of Plant Biology Vol.51 No.2
In addition to the energy dissipation of excess light occurring in PSII antenna via the xanthophyll cycle, there is mounting evidence of a zeaxanthin-independent pathway for non-photochemical quenching based within the PSII reaction centre (reaction centre quenching) that may also play a significant role in photoprotection. It has been demonstrated that acclimation of higher plants, green algae and cyanobacteria to low temperature or high light conditions which potentially induce an imbalance between energy supply and energy utilization is accompanied by the development of higher reduction state of QA and higher resistance to photoinhibition (Huner et al., 1998). Although this is a fundamental feature of all photoautotrophs, and the acquisition of increased tolerance to photoinhibition has been ascribed to growth and development under high PSII excitation pressure, the precise mechanism controlling the redox state of QA and its physiological significance in developing higher resistance to photoinhibition has not been fully elucidated. In this review we summarize recent data indicating that the increased resistance to high light in a broad spectrum of photosynthetic organisms acclimated to high excitation pressure conditions is associated with an increase probability for alternative non-radiative P680+QA- radical pair recombination pathway for energy dissipation within the reaction centre of PSII. The various molecular mechanisms that could account for non-photochemical quenching through PSII reaction centre are also discussed.