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Use of plant growth-promoting rhizobacteria to control stress responses of plant roots
Kang, Bin-Goo,Kim, Woo-Taek,Yun, Hye-Sup,Chang, Soo-Chul The Korean Society of Plant Biotechnology 2010 Plant biotechnology reports Vol.4 No.3
Ethylene is a key gaseous hormone that controls various physiological processes in plants including growth, senescence, fruit ripening, and responses to abiotic and biotic stresses. In spite of some of these positive effects, the gas usually inhibits plant growth. While chemical fertilizers help plants grow better by providing soil-limited nutrients such as nitrogen and phosphate, overusage often results in growth inhibition by soil contamination and subsequent stress responses in plants. Therefore, controlling ethylene production in plants becomes one of the attractive challenges to increase crop yields. Some soil bacteria among plant growth-promoting rhizobacteria (PGPRs) can stimulate plant growth even under stressful conditions by reducing ethylene levels in plants, hence the term "stress controllers" for these bacteria. Thus, manipulation of relevant genes or gene products might not only help clear polluted soil of contaminants but contribute to elevating the crop productivity. In this article, the beneficial soil bacteria and the mechanisms of reduced ethylene production in plants by stress controllers are discussed.
교량구조물의 설계 및 유지관리단계 신뢰성기반 LCC분석 모델
강형구 ( Kang Hyung-goo ),손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),최미라 ( Choi Mi-ra ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.2
Today, the economic evaluation is being widely used for the deterministic Life Cycle Cost (LCC) analysis method of bridge structures. Since it cannot incorporate the uncertainties, several studies have been carried out in oder to get over the incompleteness of the conventional LCC analysis method. A reliability-based life cycle cost analysis method, which can evaluate LCC analysis of existing bridge structures, has been recently proposed. Effectively maintaining bridge structures require predicting their physical and economical remaining lite using condition assessment and regression analysis using cost function viewpoint. Likewise, maintenance interventions and times models based on the reliability solution concept should be developed. Illustrative design examples of an actual reinforced concrete bridges and prestress concrete I type bridges were discussed to demonstrate the LCC effectiveness of the maintenance interventions of bridge structures, Based on the results of the numerical investigation, the LCC-effective maintenance strategy of bridge structures based on the proposed reliability-based LCC analysis models was found to lead to a more rational, economical, and safer maintenance strategy compared with the maintaining cost-optimum maintenance interventions and conventional code-based design.
Evaluation of Antioxidant Activities of Water Extract from Microwave Torrefied Oak Wood
( Jeong Bin Nam ),( Geun Hye Oh ),( Seung Min Yang ),( Seok-eon Lee ),( Seog-goo Kang ) 한국목재공학회 2018 목재공학 Vol.46 No.2
The aim of this study was to assess the in vitro potential of water extract from torrefied oak wood as a natural antioxidant. The antioxidant potential of the extracts was assessed by employing different in vitro assays, including reducing power, DPPH (2,2-diphenyl-1-picrylhydrazyl), ABTS [2,2'-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid)], and FRAP (ferric reducing antioxidant potential) assays. The DPPH activity of the extract was increased in a dosedependent manner. Measurement of total flavonoid content of water extract from torrefied oak wood was achieved using an aluminum chloride colorimetric assay; the extract contained 192.12 mg/g flavonoid, which was significantly high when compared with standard quercetin. The results obtained in this study indicate that water extract from torrefied oak wood has significant potential for use as a natural antioxidant agent.
그람양성균 감염에 대한 Teicoplanin의 임상적 효과
최강현,송재훈,조구영,유빈,김형호,서철원,배직현 대한감염학회 1993 감염 Vol.25 No.1
Backgrounds: Gram-positive cocci have been an increasing cause of nosocomial infections in recent years. Treatment of these infections is often difficult, particularly infections by methicillin-resistant Staphylococcus aureus (MRSA). Teicoplanin, a new glycopeptide antibiotic, has been reported to have an excellent in vitro and in vivo effect against various gram-positive infections. To evaluate the clinical efficacy of teicoplanin in the treatment of patients with gram-positive bacterial infection and to compare the in vitro susceptibility of teicoplanin with other antimicrobials, we performed a prospective open trial of teicoplanin. Methods: Twenty patients with infections by gram-positive organism were enrolled. The patients were received 400mg of teicoplanin followed by 200 mg from next day as maintenance dose. During the follow-up period, clinical features and laboratory parameters were ckecked to evaluate clinical efficacy and appropriate cultures were followed to determine the microbiologic efficacy. The adverse effects of teicoplanin were also observed. Results: The enrolled patients were 16 males and 4 females, whose mean age was 51±13 years. The categories of infections were bacteremia (5), skin and soft tissue infection (4), empyema (3), UTI (2), pneumonia (1), catheter associated infection (1) and infective endocarditis (1). The etiologic organisms isolated were MRSA (9), coagulase-negative Staphlycoccus (5), S. viridans (2), group D streptococcus (2), S. pneumoniae (1), and E. faecalis (1). All 20 patients treated with teicoplanin showed clinical cure (13/20) or clinical improvement (7/20), whereas 90% of isolated organisms were eradicated after teicoplanin therapy. The adverse effect of teicoplanin was minimal. Conclusion: Teicoplanin is safe and effective in the therapy of many different infections caused by gram-positive oragnisms.
콘크리트구조물의 시간의존적 설계VE 및 LCC분석 모델
강형구 ( Kang Hyung-goo ),손용우 ( Sohn Yong-woo ),이증빈 ( Lee Cheung-bin ),최미라 ( Choi Mi-ra ),박주원 ( Park Ju-won ) 한국구조물진단유지관리공학회 2005 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.9 No.1
In the resent years, the importance of VE (value engineering) and LCC (life cycle cost) analysis for concrete construction projects has been fully recognized. Accordingly theoretical models, guidelines, and supporting software systems were developed for the value engineering and life cycle cost analysis for concrete construction including bridges and building systems. However, the level of consensus on VE and LCC analysis results is still low due to the lack of reliable data on maintenance. This paper presents time dependent LCC model based value analysis method for rational investment decision making and design alternative selection for construction of concrete structures. The proposed method incorporates a time dependent LCC model and a performance evaluation technique by fuzzy logic theory to properly handle the uncertainties associated with statistics data and to analyze the value of alternatives more rationally. The presented time dependent VL and LCC analysis procedure were applied to a real world project, and this case study is discussed in the paper. The model and the procedure presented in this study can greatly contribute to design value engineering alternative selection, the estimation of the life cycle cost, and the allocation of budget for concrete construction projects.
< 전시-P-90 >Antioxidative Effect of Extracts According to torrefied Condition
( Jeong Bin Nam ),( Geun Hye Oh ),( Seung Min Yang ),( Seog-goo Kang ) 한국목재공학회 2018 한국목재공학회 학술발표논문집 Vol.2018 No.1
Torrefaction is one of the woody biomass thermal pretreatment methods which has been studied to improve the loss of raw materials from carbonization and to evaluate characteristics of torrified products according to temperature and reaction time. The heat-treated torrefied wood has increased the phenol content, phenoxy radical concentration, and antioxidant activities due to the previous studies. The increasing are being known due to the ability of hydrogen donation of the phenol function and the torrefiying wood antioxidant function for the lignin and wood extraction. On the other hand, the superheated steam treatment is a heat treatment method which is being studied to improve the added value of wood forming terrified powder with high temperature steam of 300C or more by using superheated steam treatment apparatus. In this study, the antioxidative and antioxidant activities of extract torrefied wood were investigated in order to examine the antioxidant - containing wood carbides. As a result, the antioxidant effect of extraction of torrefied wood which made by super heated steam treatment was increased in concentration - dependent manner, and the concentration of 300℃ was higher than 350℃ in 10 minutes.
Coagulation Treatment of Wastewater Using Torrefied Wood Powder
Jeong Bin Nam,Seung Min Yang,Geun Hye Oh,Seog-Goo Kang 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.6
Water quality pollution is becoming a serious social problem due to the improvement of living standards due to economic and population growth in cities. Many researches have been carried out for the efficient treatment of municipal sewage and new research is underway. In particular, as the demand for products used in physico-chemical treatment increases, the research for the development of a more safe and efficient water treatment agent is needed. This study investigated the coagulation characteristics of superfine steamed torrefied wood powder for application to domestic sewage and investigated the possibility of its use as a better coagulant or flocculant than the existing ones. Since torrefied wood flour is an eco-friendly material that is harmless to the environment, it can be used more safely than the conventional flocculants and will help improve treatment efficiency in the water treatment process as a flocculant or a coagulant. The aim of this study was to investigate nutrient reduction using torrefied wood powder (TWP) as a flocculant for wastewater treatment. The TWP flocculant were successfully removed over 96% of the turbidity. COD in the wastewater at the following optimal TWP dosage: 10% for COD and TP. Therefore, TWP can be a promising flocculants due to its high efficiency and low dose requirements. In addition, TWPs including C-PAM do not contaminate treated wastewater, which can be recycled to reduce not only the cost and the demand for treated water, but also the extra operational costs for fresh reusing wastewater.