• The Journal of the Acoustical Society of Korea
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• v.12 no.1E
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• pp.82-88
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• 1993

다중 신호 분해 방법을 통계적 성능 분석하여 이 방법의 통계적인 성질을 몇가지 얻었다. 이 결과로부터 이제까지 알려진것보다 더 정확한 분해 문턱값을 얻었고 이를 써서 가까이 있는 두 신호에 대한 다중 신호 분해방법의 분해능력을 살펴 보았다.

• Weed & Turfgrass Science
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• v.4 no.4
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• pp.348-359
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• 2015

Total 443 isolates of actinomycetes were isolated from turfgrass rhizosphere as potential biological control agents. The two isolates (S11 and S4) showed highest cellulase activity with compared to the other isolates that exhibited a clear zone of 1.2 mm around the colony on cellulose agar medium. S12 strain appeared the most active chitin degrading, which exhibited a 1.2 mm of clear zone. The highest proteolytic activity on skim milk agar was which exhibited a 7.5 mm of clear zone by S2 strain. S1 strain from the soli showed siderophore production ability, which exhibited a 0.6 mm of large clear zone on chrome azurol S agar. The antifungal activity of the volatile compound producing by 4 selected actinomycetes was investigated that inhibition rate against Rhizoctonia solani AG2-2 and Sclerotinia homoeocarpa. Growth inhibition effect of S8 isolate against S. homoeocarpa was appeared to 94.8%, S2 to 76.9%, S5 to 46.1% and S12 to 43.5%. The significant inhibition effects on mycelial growth of S. homoeocarpa were shown on media with four strains. The inhibition effect was the highest with S8 strain treatment at 94.8%.

• The Korean Journal of Mycology
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• v.26 no.2 s.85
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• pp.144-152
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• 1998

To obtain white rot fungi which have selective delignification capacity and can be used in biopulping processes, 94 different wood rotting fungi were screened and the capabilities of selected species were evaluated on deciduous and coniferous wood blocks. White rot fungi, first of all, were selected by simple enzyme tests, i.e., cellulase activity test; phenol oxidase activity test; laccase and peroxidase activity test. Most organisms that gave a positive Bavendamm gave a strongly positive laccase test with syringaldazine whereas most of those that gave a negative Bavendamm test also negative test for laccase and peroxidase, even if some exceptions were noted. Wood decay experiement were carried out to select fungal species with selective lignin-degrading ability by inoculating selected fungi to both wood blocks of Populus tomentiglandulosa and Larix leptolepis. After 12 weeks of incubation, weight losses, lignin losses, and morphological characteristics of the decayed wood were investigated. Almost all fungi tested caused 2 or more times of weight losses in P. tomentiglandulosa than in L. leptolepis, while no weight losses were detected from the un-inoculated wood blocks. Ceriporiopsis subvermispora and Phanerochaete chrysosporium were the best delignifiers for both hardwood and softwood. P. chrysosporium, however, was less effective than C. subvermispora. Bjerkandera adusta and two unidentified spp. caused delignification for only P. tomentiglandulosa. B. adusta caused simultaneous rot of all cell wall components, resulted in thinning of the secondary cell wall layers. Other fungi caused selective delignification resulting in the removal of lignin from middle lamella and separation of cells from each other.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2000.05a
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• pp.121-123
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• 2000

• Journal of the Korean Applied Science and Technology
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• v.34 no.3
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• pp.631-642
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• 2017

Protein hydrolysates derived from plants and animals having antioxidant, suppression of hypertension, immunodulatory, alleviation of pain, and antimicrobial activity has been known as playing important role like hormone. This study was performed to hydrolysis of Ogae egg white protein using the six proteases. The antioxidant activity of the produced peptides was analyzed. As a result, the maximum value of hydrolysis was protamex(46.3%), DPPH radical scavenging was bromelain(57.23%), hydroxy radical scavenging was alcalase(30.21%), superoxide radical scavenging was alcalase(58.07%), and $Fe^{2+}$ chelation ability was alcalase(72.06%). Furthermore, the antioxidant Inhibition concentration ($IC_{50}$) of peptides was evaluated for each enzyme. As a result, the maximum value of alcalase was $Fe^{2+}$ cheating ability($IC_{50}$, 1.24 mg/mL), bromelain was DPPH radical scavenging($IC_{50}$, 2.46 mg/mL), flavourzyme was $Fe^{2+}$ cheating ability($IC_{50}$, 1.25 mg/mL), neutrase was DPPH radical scavenging($IC_{50}$, 3.64 mg/mL), papain was DPPH radical scavenging ($IC_{50}$, 3.82 mg/mL) and protamex was DPPH radical scavenging($IC_{50}$, 1.93 mg/mL). Therefore, we expect that peptides produced from Ogae egg white protein using protease enzyme are useful as an antioxidant functional food ingredients.

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2020.10a
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• pp.211-211
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• 2020

• Korean Chemical Engineering Research
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• v.54 no.5
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• pp.665-670
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• 2016

This study deals with the possible degradation of toluene and acetic acid when subjected to cell-free enzyme system from the toluene degrading bacteria Pseudomonas putida and acetic acid degrading bacteria Cupriavidus necator. P. putida produces toluene dioxygenase only under the existence of toluene in culture medium and toluene is degraded to cis-toluene dihydrodiol by this enzyme. C. necator produces acetyl coenzyme A synthetase-1 and converts acetic acid to acetyl CoA in order to synthesize ATP to need for growth or PHA which is biodegradable polymer. In case of toluene degradation, the experiment was conducted before and after production of toluene dioxygenase as this enzyme, produced by P. putida, is an inducible enzyme. Toluene was detected using gas chromatography (GC). Similar amount of toluene was found in control group and before production of toluene dioxygenase (experimental group 1). However, reduction in toluene was detected after the production of toluene dioxygenase (experimental group 2). Acetic acid was detected through application of gas chromatography-mass spectrometer (GC-MS). The results showed the acetic acid peak was not detected in the experimental group to apply cell-free enzyme system. These results show that the cell-free enzyme system obtained from P. putida and C. necator retained the ability to degrade toluene and acetic acid. However, P. putida needs to produce the inducible enzyme before preparation of the cell-free enzyme system.

• Journal of agriculture & life science
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• v.52 no.6
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• pp.73-79
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• 2018

In this study, a torrefaction unit with a capacity of 50 kg/hr was developed and experimented to produce of solid fuel by reuse of the food and agricultural wastes. Dried food wastes and agricultural wastes were used for the experiments and the heated-air torrefaction characteristics were investigated by the raw materials, torrefaction air temperature, and torrefaction time. For the dried agricultural wastes, measured torrefaction capacity and lower heating values were 55.35 kg/hr and 3,333 kcal/kg, respectively. As the lower heating values of the treated samples were greater, by around 7.8%, than those of the non-treated samples, torrefaction process was a very effective method to increase the heating value of the agricultural waste. In case of the dried food waste, torrefaction capacity and lower heating value was measured 88.27 kg/hr and 4,016 kcal/kg, respectively. As the lower heating value of treated ones showed around 9.0% higher than that of non treated ones, torrefaction process is very effective method to increase the heating value of the agricultural waste also. It will be assumed that the heating value shows more higher as increase the air temperature and decrease the moisture content of torrified matter.

• Agrochemical news magazine
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• v.19 no.2 s.143
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• pp.14-17
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• 1998

• Food Science of Animal Resources
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• v.24 no.2
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• pp.198-201
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• 2004

The studies was conducted to investigate the effect of hangover drink using natural products propolis on ethanol oxidation. The hangover drink developed using propolis concentrates and various medicinal plants. The extractions of propolis and acanthopanax senticosus was shown the highest alcohol oxidation among the combination raw. The ethanol oxidation effect were not significantly different between propolis drink and in other company products in acute alcoholic toxic doses. In the case that it was conducted oral administration with acute alcoholic toxic doses 1/3(1.8mg per 1kg body weight of mouse), propolis drink comparative products of other company was shown 0.026％ to 270 min, 0.000％ to 360 min. In conclusion, propolis drink was shown excellent alcohol oxidation in fixed dose of alcohol, but was not shown in a large quantities of alcohol.