• Journal of Applied Biological Chemistry
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• v.62 no.4
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• pp.407-415
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• 2019

The biological half-life of pesticides applied on crops is the key indicator for ensuring the safety of agricultural products. The biological half-life is affected by the several factors like growing conditions of the crop, climate, application method, and physicochemical properties of pesticides. In this study, the biological half-life was calculated and the degradation rates of six triazole fungicides sprayed on perilla leaves were evaluated. Moreover, the statistical analysis confirmed the correlation between the biological half-life and physicochemical properties of six triazole pesticides. The recoveries of the six pesticides were between 84.8-104.9%, which satisfied the residual pesticide analysis criteria. The biological half-life of six pesticides sprayed on perilla leaves, calculated using the first-order kinetics model, ranged between 6.4-15.1 days. When the biological half-life and the physicochemical properties were correlated using the principal component analysis: pKa and Log P, the biological half-life was found to be affected by PC1. The correlation coefficient between biological half-life and physicochemical properties (pKa), calculated by Spearman rank-order correlation, was R² = -0.928 (p <0.01). Biological half-life has been shown to correlate with pKa. In conclusion, it can be used as a database for the relationship between biological half-life and physicochemical properties and will contribute to ensure safe supply of agricultural products.

• Clean Technology
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• v.13 no.1 s.36
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• pp.1-15
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• 2007

Biological treatment is a relatively recent air pollution control technology in which off-gases containing biodegradable odors and volatile organic compounds(VOCs) are vented through microbes. It is a promising alternative to conventional air pollution control methods. Bioreactors for air pollution control have found most of their success in the treatment of dilute and high flow waste air streams containing VOCs and odor compounds. They offer several advantages over traditional technologies such as incineration or adsorption. These include lower treatment costs, absence of formation of secondary pollutants, no spent chemicals, low energy demand and low temperature treatment. The three most widely used technologies are described, namely biofiltration, biotrickling filtration, bioscrubbing. The most widely used bioreactor for air pollution control is biofilter, but it has several limitations. In the past years major progress has been accomplished in the development of vapor phase bioreaction systems, for solving problems of biofilter. Biotrickling filters are more complex than biofilters, but are usually more effective, especially for the treatment of compounds which are difficult to degrade or compounds that generate acidic by-products. This, paper reviews fundamental and theoretical/practical aspect of air pollution control in biofilter, biotrickling filter and bioscrubber, focusing more extensively on biotrickling filtration. Special emphasis is given to the operating parameters and the factors influencing performance for air pollution control, and cost estimation in biotreatment technologies.

• Journal of Applied Biological Chemistry
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• v.59 no.1
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• pp.9-12
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• 2016

Strain AP01 was isolated for the biological cypermethrin degradation from soil and sediment in Busan. This strain was identified on the basis of phylogenetic analysis of the 16s rDNA sequence and assigned as Bacillus amyloliquefaciens AP01. AP01 could degrade about 45% of cypermethrin in the mineral medium at $30^{\circ}C$ and 180 rpm for 5 days. Furthermore when 2% glucose was added in the medium, the degradation rate of cypermethrin by strain AP01 was increased upto about 60%. Therefore, AP01 may serve as a promising strain in the bioremediation of soil polluted with cypermethrin.

• Transactions of the Korean hydrogen and new energy society
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• v.12 no.1
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• pp.1-10
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• 2001

• Proceedings of the Korean Environmental Sciences Society Conference
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• 1994.10a
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• pp.48-48
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• 1994

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2006.11a
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• pp.432-435
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• 2006

전 세계적으로 방대하게 배출되는 도축 부산물인 우모는 높은 영양적 가치를 가짐에도 불구하고 현재 사용하는 물리화학적 처리법의 여러 단점으로 효율적으로 이용되지 못하고 있는 실정이다. 그 결과 2차 오염을 발생시키지 않는 경제적 방법인 생물학적 처리에 대한 연구의 필요성이 커지고 있다. 본 연구에서는 그러한 방법 중 대표적인 방법으로 미생물이 생산하는 keratinase를 이용한 생분해에 대해 연구를 하기 위해 경남 일대 퇴비화 볏짚에서 keratinolytic protease 생성능이 우수한 균주인 RS7을 분리하였고 생화학적 동정법과 16S rDNA를 이용한 동정결과 B. pumilus로 동정되었다. 본 실험에서 분리된 B. pumilus는 기존에 활발히 연구되어 있지 않는 균주로써 native feather 분해도가 기존에 알려진 Bacillus 속들이 3일 정도에서 분해 완료되는 것과는 달리 36시간 ${\sim}$48시간 내에 깃대까지 완전히 분해하였다. 또한 분리 균주의 경제적인 분해능을 토대로 분해산물이 식물 생장에 주는 영향과 아미노산 함유량을 검토한 결과 기존의 화학적 분해에 의한 분해산물보다 아미노산 함유량이 4배가량 많았으며 식물 생장에 있어서도 생장율과 개화시점으로 미루어볼 때 비료로써의 역할을 수행할 수 있었다.

• Korean Journal of Environmental Biology
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• v.22 no.2
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• pp.265-272
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• 2004

Biological characteristics of anodic electrolyzed water were investigated in this study. Linear DNAs which were incubated at $4^\circ{C}$ and $25^\circ{C}$ for 10 mins in the anodic electrolyzed water were degraded about 40% and 50%, respectively. But the DNA was amplified pretty well without any degradation through polymerase chain reaction in the presence of anodic electrolyzed water. Protein degradation hardly occurred in the distilled water during entire incubation time of 7 days, while protein began to be degraded from 4 days in the anodic electrolyzed water. Rice seeds could germinate in the distilled water and anodic electrolyzed water with the same germination ratio, however, the anodic electrolyzed water inhibited the growth of roots and total length of rice seedlings in the soil. Anodic electrolyzed water did not affect the growth curve and cell number of marine alga significantly. The anodic electrolyzed water inhibited the browning of potato by inactivating 50% of polyphenol oxidase activity.

• 한국생물공학회:학술대회논문집
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• 2000.04a
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• pp.418-421
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• 2000

A model was developed to describe the microbial decontamination of diesel contaminated soil in a soil column. The biodegradation rate of diesel in nature depends on temperature and the pH of soil, availability of nutrients, oxygen and water. The soil moisture content is one of the essential factors because it characterizes the availability not only of water to microorganisms but also of oxygen and nutrient dissolved in soil. In this work, the rate of biodegradation was modeled by coupling Michaelis-Menten kinetics for the aqueous-phase solute with adsoption-desoption equation for diesel sorption and desorption from soil.

• Environmental engineer
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• s.76
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• pp.29-37
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• 1992

• Proceedings of the Korean Environmental Sciences Society Conference
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• 2007.05a
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• pp.453-456
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• 2007

가금류의 도축 부산물로 대량 배출되고 있는 우모는 주로 생물학적으로 난분해성 단백질인 케라틴으로 구성되어 있다. 따라서 물리화학적 처리에 의하여 우모를 처리하고 있으나 이 방법은 환경오염을 유발한다. 따라서 본 연구에서는 환경친화적 우모 분해 공정을 개발하고, 우모 분해산물의 식물 성장을 위한 비료로서의 가치를 평가하기 위하여 퇴비화 볏짚에서 케라틴 분해효소 생성능이 우수한 균주인 RS7을 분리하였다. RS7의 생화학적 특성과 16S rDNA의 염기 서열을 분석하여 동정한 결과, Bacillus pumilus RS7로 동정되었다. B. pumilus RS7은 $30^{\circ}C$에서 배양 5일 만에 우모를 완전히 분해할 수 있었다. 본 균주에 의한 우모 분해산물은 Helianthus sannuus L.의 생장율, 잎 수 증가량, 개화율, 건조 생체량에 있어 대조군과 화학적 우모 분해산물보다 우수하였다. Bacillus pumilus RS7에 의한 우모 분해산물은 식물 성장 촉진을 위한 미생물기원 비료로써의 역할을 수행할 수 있었으며, 이에 따라 양계산업에서 배출되는 우모 폐기물이 환경에 주는 악영향을 감소시킬 수 있을 것으로 예측된다.