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農藥이 土壤微生物相에 미치는 影響 : Daconil, Dipterex 및 Lasso가 土壤微生物相의 藥動과 土壤呼吸量 및 大豆의 根瘤形成에 미치는 影響
梁昌述,林秉湳 建國大學校附設農業資源開發硏究所 1987 農資源開發論集 Vol.12 No.-
This study has been conducted to investigate the effects of pesicides; Fungicide (Daconil), Insecticide (Dipterex) and Herbicide (Lasso), on soil microflora including N-fixers and soil CO₂ evolution and Legume-nodulation as well as the growth characters of Legume plant. Some results obtained from this study are as follows; 1. Total bacteria was increased while Gram(-) bacteria decreased in the plot treated with Dipterex. But in all the plot treated with each pesticide actinomycetes, fungi and spore-for-ming bacteria were respectively decreased, particularly more decreased in the plot treated with Daconil. 2. Free-living N₂-fixer Azotobacter was increased in all the plot treated with each pesticide whereas indigenous Rhizobium was decreased in all the plot treated with each pesticide, especially more decreased in the plot treated with Lasso. 3. Soil CO₂ evolution was respectively decreased in order of Dipterex plot>Control plot>Daconil plot> Lasso plot. In the plot treated with Dipterex it was slightly increased as expe-rimental time went on. 4. The number of Legume-nodulation was remarkably decreased in the plot treated with Lasso. There was no any influence in the plot treated with Daconil in comparison with Control plot, but in the plot treated with Dipterex the number of Legume-nodulation was remarkably increased. 5. The growth characters of Legume plant was respectively good in each plot treated with Daconil and Dipterex involved Control plot but not in the plot treated with Lasso.
Enzyme-responsive Liposomes for Photodynamic Therapy of Acne-inducing Bacteria
임병남,나건 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Propionibacterium acnes (P. acnes) is a major cause of acne. Acne treatment is mainly based on antibiotics, but the development of drug-resistant strains has reduced its therapeutic effect. Photodynamic therapy (PDT) produces reactive oxygen species (ROS) when light is irradiated, which is a promising strategy for treating bacteria. However, ROS without specificity can kill not only bacteria but even normal cells. Therefore, selective treatment of target bacteria is an essential strategy. In this study, enzyme-responsive liposome loaded with PS and antibiotics (ERLPA) for combination of photodynamic and anti-bacterial therapy for P. acnes which secrete extra-cellular esterase. ERLPA, composed of lipids containing ester bonds, releases antibiotics and photosensitizers when exposed to the enzyme of P .acnes. As a result, the simultaneous action of antibiotics and PS confirmed the excellent therapeutic effect aginst P. acnes was demonstrated by in vitro and in vivo experiments.
Enzyme-responsive Transfersome for Selective Photodynamic Therapy of Acne
임병남,나건 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Acne is a skin disease that affect not only in adolescents but also adults. Propionibacterium acnes (P. acnes) is a major pathogen of acne. Antibiotics are used to treat acne, but they cause side effects such as antibiotic-resistance due to excessive dose. In this study, enzyme-responsive transfersomes (ERT) which has an antibacterial photodynamic therapeutic effect for P. acnes. The addition of a surfactant as an edge activator increases the skin permeability of ERT. The photoactivity of ERT is restored by the enzyme-specific reaction of P. acnes esterase to the ester bond of ERT lipid. The selective photoactivity against P. acnes in vitro indicate excellent antibacterial effect. Also, in vivo antimicrobial effect of ERT is confirmed by a volume of skin-inflammation caused by P. acnes on the back of mouse. These results demonstrate that the photodynamic therapy with ERT has an excellent antimicrobial effect and potential as a therapeutic agent to replace antibiotics.
Lipase-responsive transfersomes for Photodynamic Therapy of Acne
임병남,나건,박형,이종환,김민경,양수근 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Acne is a skin disease, known to be related to colonization of Propionibacterium acnes(P. acnes). Antibiotics(AB) is used to treat acne, but overdose of AB, causes antibiotic resistance(AR). The use of antibacterial photodynamic therapy(aPDT) may be a novel way to overcome the risk of AR. But, PDTs can be toxic by the reactive oxygen species(ROS), regardless of normal cells and bacteria. In this study, the transfersome(LSPT) was developed using lipase sensitive lipid, deconstructed in the presence of lipase. LSPT consists of PEGylated lipids that contain PS and surfactants(SF). The addition of SF increases skin permeability. The photoactivity of LSPT is quenched, but gradually recovered by lipase. Photoactivity test exhibits an excellent antibacterial effect, confirmed by P. acnes survival rate. In vivo test is demonstrated by recovery of inflammation in acne-induced skin. These results demonstrate that LSPT-mediated aPDT has the potential as an alternative to acne treatment.
有機物施用이 土壞 microflora와 土壞呼吸量에 미치는 影響
林秉湳 건국대학교 1987 論文集 Vol.24 No.1
This study has been conducted to investigate effects of organic matter on soil microflora and soil respiration. some results obtained from this study are as follows : The number of soil organisms was generally increased by application of organic matter to the soil. Total bacteria and fungi was sharply increased about 102times than control. Actinomycetes, spore-forming bacteria and Gram (-) bacteria was respectively increased more or less than control. Indigenous Rhizobium in the soil treated with organic matter was more increased about 10times than control. Free-living bacteria (N-fixer) Azotobacter was also increased more or less than control. Aerobic cellulose decomposer was increased about 10times than control by application of organic matter while anaerobic cellulose decomposer was slightly decreased. Soil CO2 evolution in the soil treated with organic matter was increased more than double times in comparison with control. This result suggested that the growth of soil biomass and the rate of soil respiration was stimulated by application of organic matter to the soil. Soil CO2 evolution was sharply increased for three weeks after treated with organic matter, after that it was slightly increased in comparison with control.
Combination Delivery of Antibiotics and Photosensitizer for Acne Treatment Using Lipid Nanoparticles
임병남,나건,정송희,이종환,박형 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Propionibacterium acnes(P. acnes) is the leading cause of acne production. Acne treatment is mainly based on antibiotics(AB), but as drug-resistant strains become widespread. It need to alternative ways have to be developed to higher its eradication rate. Photodynamic therapy(PDT), a promising way for bacterial treatment. Photosensitizer (PS) generates reactive oxygen species(ROS) when irradiated the light. However, ROS have no specificity, can kill not only bacteria, but also normal cells. So, selective photodynamic therapy of target bacteria is an essential strategy for safety. In this study, lipase-responsible lipid nanoparticles loaded with PS and AB(LRLNP) was developed for P.acnes therapeutic agents. LRLNP, consisting of polysaccharides containing ester bonds, loses its stability and releasing AB and PS only in enzymatic environments. As a result, the simultaneous action of AB and PS demonstrated excellent therapeutic effects in vitro and in vivo when compared to AB and PS alone.