• Journal of the Korean Wood Science and Technology
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• 제20권3호
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• pp.61-66
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• 1992

It is well known that polymer chemistry started by the study on cellulose. However, the study on cellulose has not made a significant progress after the 2nd World War, because the interest of researchers has directed to the newly developed synthetic polymer science. Recently the situation has been changing as suggested by the creation of a word "Cellulose Renaissance". This change is due to the recognition that cellulose is a renewable resource and a biodegradable, environmentally friendly material. In this lecture I'd like to introduce you some recent topics in cellulose chemistry which were reported by Japanese researchers.

• 농촌지도와개발
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• 제6권2호
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• pp.3-15
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• 1999

The objectives of this study were 1) to review the developmental process of agricultural extension services since 1960 in Korea, and 2) to suggest new paradigm of agricultural extension education in the 21st century. The study suggested major objectives of agricultural extension service in Korea should be focused on; 1) Agricultural technology transfer for environmentally friendly food production, 2) Diffusion of energy saving and safe farming technologies and upbringing export oriented agriculture, 3) Education and training of capable farmers for competitive world, and 4) Technological support for home improvement considering harmony of human, environment and life. To achieve major objectives of extension services the following strategies should be employed; 1) National administration and financing. 2) Farmer oriented services should be performed since extension education is originally two-way communication process to help farmers in better decision making, 3) Human resource development for extension educators to meet increasing demands of target population, and policy measures should be implemented to increase morale of extension educators, and 4) Role of public extension should be strengthened to meet needs of majority farmers and public interests in the knowledge based information society in the 21st century.

• 식물병연구
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• 제21권3호
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• pp.222-226
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• 2015

The chitinase-producing bacterial strain C-1 is one of the key chitinase-producing biocontrol agents used for effective bioformulations for biological control. These bioformulations are mixed cultures of various chitinolytic bacteria. However, the precise identification, biocontrol activity, and the underlying mechanisms of the strain C-1 have not been investigated so far. Therefore, we evaluated in planta biocontrol efficacies of C-1 and determined the draft genome sequence of the strain in this study. The bacterial C-1 strain was identified as a novel Serratia sp. by a phylogenic analysis of its 16S rRNA sequence. The Serratia sp. C-1 bacterial cultures showed strong in planta biocontrol efficacies against some major phytopathogenic fungal diseases. The draft genome sequence of Serratia sp. C-1 indicated that the C-1 strain is a novel strain harboring a subset of genes that may be involved in its biocontrol activities.

• 식물병연구
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• 제24권3호
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• pp.242-247
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• 2018

Pseudomonas chlororaphis O6 induces systemic tolerance in plants against drought stress. A volatile, 2R, 3R-butanediol, produced by the bacterium causes partial stomatal closure, thus, limiting water loss from the plant. In this study, we report that applications of extracellular polymeric substances (EPS) from P. chlororaphis O6 to epidermal peels of leaves of Arabidopsis thaliana also reduce the size of stomatal openings. Growth of A. thaliana seedlings with applications of the EPS from P. chlororaphis O6 reduced the extent of wilting when water was withheld from the plants. Fluorescence measurements showed photosystem II was protected in the A. thaliana leaves in the water stressed EPS-exposed plants. These findings indicate that P. chlororaphis O6 has redundancy in traits associated with induction of mechanisms to limit water stress in plants.

• 한국유기농업학회지
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• 제13권3호
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• pp.243-259
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• 2005

In the development of policies and projects for regional development, consolidating region's organization and organizational leadership that could establish and operate voluntary developmental plans along with active participations by regional people are important. There have been successful cases of regional agricultural products emphasizing regional characteristics by strengthening functions and autonomy of the local government based on the premise of increasing mealable relationship among local industries and maximizing the characteristics of local resources and local resource utilization. However, effective pursuing is difficult due to lack of organization and leadership. Centering around local units with their importance recognized playing the core role in the development of rural areas, other important issues are activating civic organizations essential for local development based on town units and agricultural amenity resources in rural areas by seeking methods of rearing organizational leadership, improving rural incomes by strengthening local competitiveness through environmentally-friendly agricultural products based on local units, and developing and activating farm experience related with green tour. The types of organization and leaders are analyzed by investigating approved cases of farm experience. According to the results of the analysis, we seek the methods of promoting organizations and leaders for promoting farm experiences in villages and methods of constructing support organizations for promoting farm experience centering around local government units (such as city, Kun, Eup, Myun and village).

• 에너지공학
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• 제27권3호
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• pp.36-40
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• 2018

Climate change is one of the major issues in both the developed and developing world. Greenhouse gas (GHG) emission is one of the implications for climate change. It is increasing rapidly. Although the emission is much less when compared to the rest of the world, Ethiopia has also faced this global issue. The major source for GHG emission in Ethiopia is agriculture. Therefore, the agriculture sector has to be given more attention in Ethiopia. To overcome the problem, Climate-Resilient Green Economy (CRGE) strategy has been initiated. One way of executing this target is to create a sustainable and environmentally friendly pathway to use agricultural byproducts. Sugarcane is one of the major plants in Ethiopia. Its byproducts are bagasse, molasses, and press mud. Since it is a waste product, it is economical and creates a sustainable and green environment by reducing GHG emissions. Sugarcane byproducts have versatile applications like as fuel, as cement replacing material, as a mitigation for expansive soils, as biosorbent for the treatment of water and wastewater and also as a wood material. However, Ethiopia has not used this byproduct massively as it is readily available. This paper reviews the possible applications of sugarcane byproducts to mitigate climate change.

• 한국유기농업학회지
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• 제23권2호
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• pp.281-289
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• 2015

In sustainable viticulture, green manure represents a safe and non-polluting way to bring large quantities of organic matter into the soil. The cultivation of green manure crops plays an important role in soil quality and sustainability of agricultural system. This study was conducted to evaluate the effects of green manure fertilization on yield and quality of the Campbell Early grape variety in the organic vineyard. Hairy vetch was the more productive green manure crop, yielding higher dry materials. Average yields of grape were significantly greater in hairy vetch+rye ($13.02ton\;ha^{-1}$) than nature weed ($11.65ton\;ha^{-1}$), respectively. The concentrations of total as well as individual anthocyanins were consistently higher with hairy vetch treatment compared with rye and nature weed, thus making the green manure cultivation is an environmentally friendly cultivation to increase the yield and anthocyanin contents in organic grape.

• 한국초지조사료학회지
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• 제38권3호
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• pp.145-149
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• 2018

The objective of this study was to determine the effect of injection application of pig slurry on ammonia ($NH_3$) and nitrous oxide ($N_2O$) emission from timothy (Phleum pretense L.) sward. The three treatments were applied: 1) only water as a control, 2) pig slurry application by broadcasting, 3) pig slurry application by injection. The pig slurry was applied at a rate of $200kg\;N\;ha^{-1}$. Total $NH_3$ and $N_2O$ emission, expressed as a cumulative amount throughout the measurement time (40 days), was $2.68kg\;NH_3-N\;ha^{-1}$ and $6.58g\;N_2O-N\;ha^{-1}$, respectively, in the control. The injection application of pig slurry decreased total $NH_3$ and $N_2O$ emission by 39.8% and 33.3%, respectively, compared to broadcasting application of pig slurry. The present study clearly showed that injection application exhibited positive roles in reducing N losses through $NH_3$ and $N_2O$ emission.

• 유통과학연구
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• 제12권11호
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• pp.15-23
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• 2014

Purpose - This study is one of a series of studies on the successful Sextic industry, which was conceived because of the urgency of transforming agriculture to cope with global market-opening pressures as well as to solve domestic difficulties facing Korean rural areas. Research design, data, and methodology - This study involved constructing a questionnaire based on evaluation standards proposed by prior research. Further, this study intended to lay the groundwork for the development of the Sextic industry through the use of IPA. It also sought to explore the possibility of developing scales capable of performing causality analysis. We conducted 149 effective questionnaires, and applied the paired t-test and IPA for the analysis. Results - The results of the analysis indicated that the degrees of producers' perceptions regarding the importance and performance with respect to five variables of the performance indicators were different. Conclusion - It was suggested that the implementing subjects of the Sextic industry should prevent possible problems relating to several factors by building close cooperative relationships with the interested parties of each industry.

• The Plant Pathology Journal
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• 제30권2호
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• pp.220-227
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• 2014

The GacS/GacA system in the root colonizer Pseudomonas chlororaphis O6 is a key regulator of many traits relevant to the biocontrol function of this bacterium. Proteomic analysis revealed 12 proteins were down-regulated in a gacS mutant of P. chlororaphis O6. These GacS-regulated proteins functioned in combating oxidative stress, cell signaling, biosynthesis of secondary metabolism, and secretion. The extent of regulation was shown by real-time RT-PCR to vary between the genes. Mutants of P. chlororaphis O6 were generated in two GacS-regulated genes, trpE, encoding a protein involved in tryptophan synthesis, and prnA, required for conversion of tryptophan to the antimicrobial compound, pyrrolitrin. Failure of the trpE mutant to induce systemic resistance in tobacco against a foliar pathogen causing soft rot, Pectobacterium carotovorum SCCI, correlated with reduced colonization of root surfaces implying an inadequate supply of tryptophan to support growth. Although colonization was not affected by mutation in the prnA gene, induction of systemic resistance was reduced, suggesting that pyrrolnitrin was an activator of plant resistance as well as an antifungal agent. Study of mutants in the other GacS-regulated proteins will indicate further the features required for biocontrol-activity in this rhizobacterium.