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Eugene Shim,Eunju Song,Kyoung Sook Choi,Hyuk-Joon Choi,Jinah Hwang 대한지역사회영양학회 2017 Nutrition Research and Practice Vol.11 No.3
BACKGROUND/OBJECTIVES: Gastrodia elata Blume (GEB), a traditional herbal medicine, has been used to treat a wide range of neurological disorders (e.g., paralysis and stroke) and skin problems (e.g., atopic dermatitis and eczema) in oriental medicine. This study was designed to investigate whether GEB extract inhibits melanogenesis activity in murine B16F10 melanoma. MATERIALS/METHOD: Murine B16F10 cells were treated with 0-5 mg/mL of GEB extract or 400 μg/mL arbutin (a positive control) for 72 h after treatment with/without 200 nM alpha-melanocyte stimulating hormone (α-MSH) for 24 h. Melanin concentration, tyrosinase activity, mRNA levels, and protein expression of microphthalmia-associated transcription factor (MITF), tyrosinase, tyrosinase-related protein (Trp)1, and Trp2 were analyzed in α-MSH-untreated and α-MSH-treated B16F10 cells. RESULTS: Treatment with 200 nM α-MSH induced almost 2-fold melanin synthesis and tyrosinase activity along with increased mRNA levels and protein expression of MITF, tyrosinase, Trp1 and Trp2. Irrespective of α-MSH stimulation, GEB extract at doses of 0.5-5 mg/mL inhibited all these markers for skin whitening in a dose-dependent manner. While lower doses (0.5-1 mg/mL) of GEB extract generally had a tendency to decrease melanogenesis, tyrosinase activity, and mRNA levels and protein expression of MITF, tyrosinase, Trp1, and Trp2, higher doses (2-5 mg/mL) significantly inhibited all these markers in α-MSH-treated B16F10 cells in a dose-dependent manner. These inhibitory effects of the GEB extract at higher concentrations were similar to those of 400 μg/mL arbutin, a well-known depigmenting agent. CONCLUSIONS: These results suggest that GEB displays dose-dependent inhibition of melanin synthesis through the suppression of tyrosinase activity as well as molecular levels of MITF, tyrosinase, Trp1, and Trp2 in murine B16F10 melanoma. Therefore, GEB may be an effective and natural skin-whitening agent for application in the cosmetic industry.
Reverse-optimization alignment algorithm using Zernike sensitivity
Eugene D. Kim,Young-Wan Choi,Myung-Seok Kang,Se Chol Choi 한국광학회 2005 Current Optics and Photonics Vol.9 No.2
When aligning catoptric or catadioptric telescopes for space cameras, it is difficult to align precisely if the field of view is large or there are several reflective surfaces. The quantitative knowledge of mirror misalignments greatly helps align a misaligned telescope precisely, and also reduce the alignment time. This paper describes a generalized reverse-optimization alignment solution algorithm using Zernike sensitivity, and proposes the minimum number of fields to take interferograms. This method was successfully applied on a Cassegrain telescope design for Earth observation from space with arbitrary misalignments and a model including some primary mirror deformation.
The Effects of Municipal Policy on Green Building Designations in the United States
( Eugene Choi ) 서울대학교 행정대학원 2010 Journal of Policy Studies Vol.25 No.2
Abstract: This article describes the results of a quantitative examination of the effect of municipal policies on the number of commercial office buildings with a green building designation. Many states and cities have adopted green building requirements and incentives as policy instruments. During this study, an ordinary least square (OLS) regression analysis was conducted using American inner cities as a unit of analysis and coding municipal green building regulations and incentives as four separate dummy variables. The study also included four factors grouped by a factor analysis-supply-side factors, demand-side factors, air quality, and temperature-to control for external effects that can affect the decision to implement green building construction. The results indicate that, at the municipal level, regulatory policy has been a strong tool to promote green office building developments, as expected, but incentive-based policies have not been as effective, with the exception of administrative incentives.