• Title, Summary, Keyword: Salicylate

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Survey of Preservatives and UV Filter Ingredients of Distributed Sunblock Products in Korea (국내 유통 자외선 차단 기능성화장품 중 살균보존제 및 자외선차단성분 사용실태조사)

  • Park, Jeong Hee;Kim, Jong Pil;Kim, Jin A;Seo, Kye Won;Kim, Eun Sun;Seo, Jumg Mi
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.43 no.4
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    • pp.381-390
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    • 2017
  • This study was conducted to determine 16 preservatives and 18 UV filter ingredients levels in 100 sunblock products. The order of detection rates of preservatives was phenoxyethanol (n=61), benzoic acid (n=19), methyl paraben (n=11), benzyl alcohol (n=8), propyl paraben (n=7). Also the order of detection rates of UV filter ingredients was titanium dioxide (n=81), ethylhexyl methoxycinnamate (n=69), zinc oxide (n=48), ethylhexyl salicylate (n=48), bis-ethylhexyloxyphenol methoxyphenyltriazine (n=44). The content of the detected preservatives and UV filter ingredients was within maximum allowed amount established by KFDA. In addition, preservatives and UV filter ingredients, which were not labeled in the products, were detected in 31 and 2 products respectively.

COINCIDENCE BETWEEN RADIOGRAPHS AND CLEARING SAMPLES ON THE ROOT CANAL SYSTEMS OF SINGLE HOOTED PREMOLARS (단근 소구치의 근관계에 관한 방사선 사진과 투명표본 간의 일치도)

  • Hwang, Ho-Keel;Kang, Ho-Min;Seo, Kang
    • Restorative Dentistry and Endodontics
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    • v.30 no.6
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    • pp.461-469
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    • 2005
  • The aim of this study was to compare the root canal systems of maxillary and mandibular premolars that had a single root using radiographs and clearing samples. 142 single rooted premolars were selected and mesio-distal and bucco-lingual views were radiographed using intra-oral dental standard films. Four equally trained examiners classify the root canal types from the developed radiographs. After opening the tooth for access, it was stored in $5\%$ NaOCl to dissolve the pulp tissue. Indian ink was then injected into the pulp cavity to stain the pulp tissue. It was cleared in methyl salicylate after being decalcified with $5\%$ nitric acid for 48 hours, and the root canal type was evaluated at a magnification of $\times$ 20 using a stereomicroscope. The results are as follows ; There were statistically significant differences between the radiographs and clearing samples of the root canal types among examiners (p < 0.05). There might be differences in the root canal types among examiners when the same radiograph is used. Therefore, considering the difficulty in estimating the root canal types, clinicians need to be careful when interpreting radiographs before root canal therapy.

Isolation of Synthetic Detergent Decomposing Microorganisms in Wastewater and Synthetic Detergent Decomposition Characterization of the Microorganisms (폐하수중 합성세제분해균의 분리(分離) 및 합성세제 (ABS) 분해특성(分解特性))

  • Lee, Hong-Jae;Heo, Jong-Soo;Cho, Ju-Sik;Han, Mun-Gyu;Choi, Jeong-Ho;Lee, Chun-Hee
    • Korean Journal of Environmental Agriculture
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    • v.12 no.2
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    • pp.144-152
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    • 1993
  • A bacterium which degrades efficiently synthetic detergents was isolated from the polluted waters, activated sludge of wastewater treatment plants or polluted soil. This bacterium showed considerably higher growth rate in the agar plate containing $2,000{\mu}g/ml$ of synthetic detergents than any other isolated strains, was identified as a Pseudomonas fluorescens or strains similar to it. The strain was named as a Pseudomonas fluorescens S1. Optimum pH and temperature for the growth of the Pseudomonas fluorescens S1 were pH 7.0 and $30^{\circ}C$, respectively. The strain was resistant to streptomycin and gentamycin, but sensitive to kanamycin. The strain was greatly resistant to zinc chloride, lead nitrate and copper sulfate, but unable to grow in the presence of relatively low concentrations of mercury chloride and silver nitrate. This strain utilized benzene, catechol, cyclohexane and xylene as a sole carbon source. The strain was well grown in the medium containing ABS 10,000${\mu}g$/ml. Degradation of ABS was 55% and 60% at 20${\mu}g$/ml and 100${\mu}g$/ml of ABS, respectively. Benzene ring was degraded 45% in 100${\mu}g$/ml of ABS. During the incubation of the strain in the medium containing ABS 100${\mu}g$/ml and COD 10,000${\mu}g$/ml for 4 days, degradation of ABS and COD were reduced to 40${\mu}g$/ml and 3,200${\mu}g$/ml, respectively. Total amino acid content of the Pseudomonas fluorescens S1 grown with 1,000${\mu}g$/ml of ABS was 115mg/g cell, whereas its content was decreased in the bacterium grown without synthetic detergent by 9.4%.

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