• Journal of the Korea Convergence Society
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• v.8 no.12
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• pp.425-430
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• 2017

This study was conducted to measure the antimicrobial activity and antiseptic effect of Smilax china root extracts against Propionibacterium acnes and to develop natural antimicrobial extracts as an alternative for synthetic preservatives, which have recently been controversial. Extracts were obtained from dried Korean Smilax china root at room temperature using two solvents, distilled water and 95% EeOH, separately. According to the results of this study, the antimicrobial effect of Propionibacterium acnes 3314 and Propionibacterium acnes 3320 against Propionibacterium acnes was outstanding. In particular, the clear zone of the extract using distilled water showed the highest activity with 16.61 mm. As for the result of the collection of contaminated skin sample, the clear zone was 24.48 mm. This indicates that Smilax china root extracts show a high activity against skin flora as well as a high antimicrobial activity against Propionibacterium acnes. In conclusion, it is confirmed that Smilax china root extracts can be used as raw materials for cosmetics that have antimicrobial activity and antiseptic effect, and it is expected that Smilax china root extracts will be used as basic materials for the development of future natural preservatives.

• The Korean Journal of Ecology
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• v.23 no.5
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• pp.353-357
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• 2000

The soil pH favored by several native plants in Korea ranges 5.33∼7.20, while a more acidic range of pH 3.95∼6.10 is acceptable to exotic plants. Ethanol extracts of native and exotic plants in Korea were investigated for antimicrobial activity against Bacillus sphiaericus 2362, Bacillus thuringiensis var. subtilis and Bacillus thuringiensis var. cereus and Actinomycetes. Higher antimicrobial activity was observed from the extract of exotic plants than those of native plants. The ethanol extract of Ambrosia artemisiifolia var. elatior was observed to have the highest antimicrobial activity against 4 species of soil microbes. Especially, antimicrobial activity of Ambrosia artemisiifolia var. elatior showed the largest clear zone of 48mm in Actinomycetes. Larger clear zone was formed in the order of caffeic acid, benzoic acid and ρ -coumaric acid among the nine chemical compounds. Accordingly, the antimicrobial activity of Ambrosia artemisiifolia var elatior against Actinomycetes was found to be due to the synergetic effect of chemical compounds.

• International Journal of Air-Conditioning and Refrigeration
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• v.10 no.3
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• pp.117-128
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• 2002

This paper describes the smoke filling process of a fire field model based on a self-deve-loped SMEP (Smoke Movement Estimating Program) code to the simulation of fire induced flows in the two types of atrium space containing a ceiling heat flux. The SMEP using PISO algorithm solves conservation equations for mass, momentum, energy and species, together with those for the modified k-$\varepsilon$ turbulence model with buoyancy production term. Also it solves the radiation equation using the discrete ordinates method. Compressibility is assumed and the perfect gas law is used. Comparison of the calculated upper-layer average tempera-ture and smoke layer clear height with the zone models has shown reasonable agreement. The zone models used are the CFAST and the NBTC one-room. For atrium fires with ceiling glass the ceiling heat flux by solar heat causes a high smoke temperature near the ceiling. However, it has no effect on the smoke movement such as the smoke layer clear heights that are important in fire safety. In conclusion, the smoke layer clear heights that are important in evacuation activity except the early of a fire were not as sensitive as the smoke layer tem-perature to the nature of ceiling heat flux condition. Thus, a fire sensor in atrium with ceiling glass has to consider these phenomena.

• Journal of Food Hygiene and Safety
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• v.15 no.2
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• pp.173-175
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• 2000

Nine strains of pathogenic Vibrio sp. of clinical and environmental origin were examined for the degradation of gelatin, casein and hemolysin which is important to the virulence of this bacterium. Culture filtrates of all nine strains of Vibrio exhibited proteolytic activities. Especially, four strains of V. parahaemolyticus and one V. alginolyticus showed strong gelatin-degrading activity. In terms of hemolytic activity, three V. parahaemolyticus and V. mimicus showed strong $\beta$-hemolysis whereas those of strains of V. alginolyticus, V. fluvialis, V. vulnificus examined lacked this activity.

• The Korean Journal of Mycology
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• v.39 no.3
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• pp.227-228
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• 2011

Fibrinolytic activities of culture concentrates of various yeasts were investigated. The concentrates of the culture broth of Saccharomyces cerevisiae Y99-7 showed the strongest fibrinolytic activity of 25 mm (clear zone). The fibrinolytic activity of Saccharomyces cerevisiae Y99-7 was more high in the culture concentrates from PD broth rather than that of yeast extract-peptone dextrose cultures (clear zone : 22.7 mm).

• The Korean Journal of Ecology
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• v.14 no.4
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• pp.435-448
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• 1991

Mt. paektu(altitude 2,749.6m) is ecologically important because successional processes following volcanic eurption are quite clear. We investigated plant communities with altitude know vertical distribution of plant vegetation on the north-western slope of Mt. paektu was divided into five parts; the pine-hardwood forest zone(600∼1,000m alt.), the lower coniferous forest zone (1,000∼1,500 m alt.), the upper coniferous forest and birch forest zone(1,500∼2,000 m alt.), the alpine shrub zone(2,000∼2,500 m alt.) and the alpine meadow zone(2,500∼2,749 m alt.). In particular, the alpine zone was divided into alpine shrub and alpine meadow zones and distributed up to 2,500m alt. these results reflet the adaptations of these shrubs at this altitude. But these shrubby communities disappeared on the alpinemeadow zone. In the alpine meadow zone above than 2,500m alt., some meadows, papaver radicatum var pscudoradicatum. bistorta ochotensis, chrysathemum zawadskii var. latilobum etc., were occured.

• The Korean Journal of Ecology
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• v.15 no.1
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• pp.59-65
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• 1992

Pollen analysis to clear vegetational history of korea was carried out on the deposite taken from the pit of the miruksa site, south-western korea(36o00'18'N, 127o1'12'E, 10m in alt.). This area has been known as the cool temperate zone(southern zone) according to yim and kira(1975). But, now we can not found the original vegetation because the area has been disturbed severely and almost area changed to cultivated land.the area is one of the most developd area in early agricultural stage of korea. By the pollen diagram, three local pollen zones are distinguished in this site, bottom to surface, as following. is-Ⅰ :pinus-quercus zone (140∼120 cm, sample 1 and 2) is-Ⅱ :ulmus+zelkova zone(120∼84 cm, sample 3∼6) is-Ⅲ :pinus zone(84∼0 cm, sample 7 ∼13) is-Ⅰ is characterized by high values in frequences of pinus, the temperate conifer and quercus the cool temperate oak, and is-Ⅱ zone by the decrease of quercus and increase of ulmus and increase of ulman+zelkova as ravine forest elements, isⅢ zone is characterized by pinus, especially, based on data of sample no.9.

• ALGAE
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• v.18 no.4
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• pp.365-369
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• 2003

Algal flora and community structure of benthic marine algae in the subtidal zone, Yeongil Bay area were studied. The number of algal species in the quadrats were identified totally 78: 2 Cyanophyta, 10 Chlorophyta, 19 Phaeophyta, and 47 Rhodophyta. The dominant species based on biomass were Sargassum hornerii, Undaria pinnatifida, and Sargassum thunbergii. Vertical distribution was clear by the representative algae such as, Undaria pinnatifida, Sargassum thunbergii, Sargassum horneri, Corallina spp. in the upper subtidal zone, Undaria pinnatifida, Sargassum horneri, Caulerpa okamurae in the middle zone, and Dictyopteris divaricata in the lower zone.

• Journal of Applied Biological Chemistry
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• v.54 no.3
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• pp.159-165
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• 2011

Rosmarinus officinalis extracts had a significant antimicrobial activity against Helicobacter pyori. Total phenolic contents and inhibition zone of rosemary extracts were estimated to be 25.7 mg/g and 14 mm at $200{\mu}g/mL$ of phenolic contents, respectively. The Sephadex LH-20 and MCI-gel CHP-20 column chromatographic separations for the phenolic extracts from R. officinalis leaves led to isolation of five acids, whose structures were determined as protocatechuic acid (A), coumaric acid (B), caffeic acid (C), chlorogenic acid (D), and rosmarinic acid (E), from interpretation of spectroscopic data including nagative fast atom bombardment (FAB)-mass, $^1H$-NMR, $^{13}C$-NMR, and IR. All isolated compounds were tested for antimicrobial activity against H. pyori. The purified single compound showed less antimicrobial activity against H. pylori than the mixed purified compounds, which generate A+B, A+E, C+D, C+E (each $200{\mu}g/disc$) excellent as large clear zone by synergy effect. These results indicate rosemary extracts are preventive agents against H. pyori.

• Journal of Korea Technical Association of The Pulp and Paper Industry
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• v.35 no.1
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• pp.34-40
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• 2003

This study was carried out to select the useful bacteria which secret extracellula enzymes for enzymatic deinking agent of old newspaper. CMCase, FPase and xylanase activities of the bacteria liquid culture were measured at optimal growth conditions. Clear zone test was checked on the solid culture. The results of this study were as follow: Eight strains of 28 bacteria isolated from a paper mill soil ground were shown strong CMCase and xylanase activity with the clear zone test. The optimal pH and temperature for culture growth were 6~8 and 26~$34^{\circ}C$, respectively and optimal culture period were less than 60 hours. Based on CMCase, FPase and xylanase activity, strain No. 18, 21, 22 and 28 which were relatively higher than the other strains, were selected for further enzymatic deinking research.