• Journal of Biomedical Engineering Research
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• v.38 no.6
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• pp.291-294
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• 2017

It is known that laptop computer stand is helpful to maintain the good posture while using laptop computer on the desk. But the quantitative validation of its effect has not been reported. Using the wearable neck posture tracker, the forward flexion angle of the neck can be measured in daily life. In this study, the forward flexion angles of the neck while using the laptop computer with and without laptop computer stand were compared. From the posture data of 10 subjects for 6 hours, the average of the forward flexion angle was 0.9 degree with laptop computer stand and 16.3 degree without laptop computer stand. As the conclusion, laptop computer stand can decrease the forward flexion angle which is known as forward head posture while using the laptop computer on the desk.

• Environmental Engineering Research
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• v.13 no.3
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• pp.136-140
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• 2008

$TiO_2$ photocatalyst has been known to exhibit a notable disinfecting activity against a broad spectrum of microorganisms. A lot of commercial $TiO_2$ photocatalyst products have been developed for antimicrobial purposes. However, a standard method has not yet been proposed for use in testing antimicrobial activity. In this study, we developed a $TiO_2$ photocatalytic adhesion test method with film as the standard testing method for the evaluation of antimicrobial activity. This method was devised by modifying the previous antimicrobial products test method, which has been widely used, and considering the characteristics of $TiO_2$ photocatalytic reaction. The apparatus for testing the antimicrobial activity was composed of a Black Light Blue (BLB) lamp as UV-A light source, a Petri dish as the cover material, and a polypropylene film as the adhesion film. The standard $TiO_2$ photocatalyst sample, Degussa P25 $TiO_2$ - coated glass, could only be used once. The optimal initial concentration of the microorganism, proper light intensity, and light irradiation time were determined to be $10^6$ CFU/mL, 1.0 mW/$cm^2$, and 3 hr, respectively, for testing and evaluating antimicrobial activity on the $TiO_2$ surface.

• Journal of Species Research
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• v.13 no.1
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• pp.67-88
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• 2024

Macrofungi are essential decomposers in the forest environment. Although more than 70% of the land is mountainous, there has been a lack of research on mushroom diversity in Korea compared to the global species estimation. For this reason, the need for further research became apparent. The surveys were conducted from 2014 to 2022 nationwide. As a result, 15 unrecorded macrofungal species were discovered: Agaricus thiersii, Baorangia alexandri, Boletellus putuoensis, Entoloma bulakhae, Entoloma pygmaeopapillatum, Entoloma subtenuicystidiatum, Gerronema kuruvense, Hyphoderma nudicephalum, Hyphoderma tenue, Macrolepiota subcitrophylla, Mycena jingyinga, Mycena yuezhuoi, Ophiocordyceps vespulae, Scytinostroma acystidiatum, and Steccherinum straminellum. These species are identified based on morphological, molecular, and phylogenetic analyses using the internal transcribed spacer (ITS) region and the nuclear large subunit rRNA (LSU) region. Here, we provided macro- and micro-morphological figures with phylogenetic trees to support 15 species as unrecorded to Korea.

• Macromolecular Research
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• v.15 no.1
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• pp.1-4
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• 2007

• Proceedings of the Korean Society of Rheology Conference
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• 2003.05a
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• pp.89-92
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• 2003

No Abstract, See Full Text

• Proceedings of the KOSOMBE Conference
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• v.1995 no.11
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• pp.154-156
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• 1995

• Proceedings of the Korean Society of Crop Science Conference
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• 2006.04a
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• pp.520-521
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• 2006

• 대한방사선방어학회:학술대회논문집
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• 2010.04a
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• pp.52-53
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• 2010

• Proceedings of the Microbiological Society of Korea Conference
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• 2007.05a
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• pp.56-58
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• 2007

• Biotechnology and Bioprocess Engineering:BBE
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• v.2 no.2
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• pp.82-85
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• 1997

The nar promoter as an inducible promoter was characterized for the process development for the gene expression and the protein production under anaerobic condition. The LB medium was selected as a main culture medium showing the enzyme activity of 18,000 units/min/g cell in the flask cultivation. The optimum concentration of nitrate was 1%. Under anaerobic conditions, the gene expression was fully induced in the presence of nitrate.