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류경열,허훈 충북대학교 농업과학기술연구소 1994 農業科學硏究 Vol.11 No.2
Leaves of soybean (Paldal, Hwanggeum, Jangkyung and Manri) were sprayed with suspension of their homologus strain of Pseudomonas syringae pv. glycinea and the physiological changes were examined. The stomatal resistance increased in inocluated leaves. Preferred sites for survival and multiplication of the pathogens were the sheilds of leaf vein and the stomatal pits. Some pathogens entered the leaf tissue directly through the stomata and caused symptom after 2 days. The content of macroelements of soybean leaves were found slightly different between healthy and diseased. Magnesium content showed higher in healthy than in diseased leaves, however, potassium content was higher in diseased. There was no significant relations between macroelement content and stomatal resistance. As the time passed after inoculation, potassium content increased and then decreased, however, stomatal resistance increased constantly
Palobutrazol과 Chlorocholine Cholride 處理가 水稻 幼苗의 生理的 特性에 미치는 影響
류경렬,허훈,김인현 충북대학교 농업과학기술연구소 1995 農業科學硏究 Vol.12 No.2
This study was conducted to investigate the incidence of urolithiasis of Korean native cattle and beef cattle in abattoir and feedlot cattle. In addition, chemical composition of urinary calculi and field treatment of urolithiasis in feedlot cattle were also studied. The results obtained were as follows : A total of 365 heads(46.8%) of 780 cattle in abattoir were found to be urinary calculi, 55.9% of these in Korean native cattle and 44.3% in beef cattle, respectively. Seasonal incidences were relatively high in spring(57.9%) and winter(55.8%), while low in autumn(47.4%) and summer(28.0) Among 474 castrated growing cattle which feeding with pellet feeds, 318 heads(66.6%) were confirmed to urolithiasis by means of urine precipitation test. Morphological classifications of urinary calculi were appeared to 25-3% in irregular form, 24.0% in granular form, 20.7% in fine crystals, 18.0% in globular form and 12.0% in powdered form, respectively. Chemical compositions of urinary calculi were detected to relatively high levels of magnesium(17.565%) and silica(5.340%) due to feeding on Tong-il rice straw. In the field treatment of special formulated drugs to affected feedlot cattle, a total of 291 heads(91.5%) of 318 cattle were recovered as high as at the 4 weeks after treatment. The principal pathological changes were composed of hemorrhages, deceleration, degeneration and necrotic lesions on renal cortex and hemorrahages, chronic inflammatory lesions on renal pelvis and papillae, urethra and urinary bladder in the urinary system. Key words ; urolithiasis, urinary calculi, feedlot cattle.
세균성 점무늬병균에 感染된 콩잎 葉肉 組織의 形態學的인 變化
류경열,허훈,김용기 충북대학교 농업과학기술연구소 1995 農業科學硏究 Vol.12 No.2
A comparison was made of the in vitro activities of earlier quinolone antibacterials and some antibiotics used in aquaculture in Korea and newer quinolones, aganist selected flesh bacterial pathogens. Most quinolones were shown high sensitivity against all Gram- negative strains. Some Gram- negative strains, however, showed a resistance to the earlier quinolones and antibiotics. Bacteriostatic and bactricidal effects of the newer quinolones on Gram- negative strains were higher than those of the earlier quinolones. Among the newer quinolones, norfloxacin and pefloxacin showed a great reduction of the number and rate of mortality, and confirmed that their therapeutic effects were very excellent. Norfloxacin and pefloxacin were also recognized to be a wide spectrum of antibacterial quinolones, and their application was expected to be effective for the treatment of many fish bacteriaal diaseases, difficult to treat with existing antibiotics. The newer quinolones were considerd to have the potential for the treatment of Gram- negative, and possibly Gram- positive, bacterial fish pathogens.
養液裁培에 의한 상추의 物質生産 및 光合成에 特性에 關한 硏究
許煇,柳慶烈,崔基準 충북대학교 농업과학기술연구소 1993 農業科學硏究 Vol.10 No.2
These experiments were carried out for three terms (1st : 5/23-6/28, 2nd : 8/14-9/l9, 3rd : 9/20-l1/11) to investigate the rate of Dry Matter Production and Photosynthesis of hydroponically cultivated lettuce. The results were obtained as follows : 1.The number of Lettuce leaf in each culturing term was higher in the third term than in others and the emergence rate of the 1st term was the factest one. 2.Among the terms, the photosynthetic activity was in its highest in the 1st term. Progressing curve of photosynthesis during the day showed similar patterns but the highest rate of photosynthesis occurred at noon in the first term, 1 P.M. in the second term, and 11 A. M. in the third term. 3.Fresh weight of the 3rd term increased to 158% compared to that of the 1st term. However, that of the 2nd term decreased to 54% and the rate of dry weight and of specific leaf area decreased, too.
전기비저항을 이용한 지하매설물 탐사(II) - 현장실험 중심으로
류희환,조선아,김경열,조계춘,Ryu, Hee Hwan,Cho, Seon Ah,Kim, Kyoung Yul,Cho, Gye Chun 한국터널지하공간학회 2017 한국터널지하공간학회논문집 Vol.19 No.3
관로, 전력구 등 지하매설물의 불투명한 존재여부 및 부정확한 정보로 인해 신규 지하매설물의 계획 노선, 설계, 시공에 많은 문제를 야기시키고 있다. 이에 Ryu(2015) 등은 전기장 해석을 통해 지하매설물의 크기, 위치, 방향 등을 예측할 수 있는 식을 제안하였다. 3개의 현장에 적용하여 싱크홀 존재 여부 및 크기와 지하매설물의 위치, 크기, 방향을 예측하였으며, 예측된 결과를 토대로 설계에 반영되고 후속 조치가 수행되었다. The uncertain existence and insufficient information of underground structures, such as pipe lines and cable tunnels, is causing many problems related to route plan, design, construction of new underground structures. The theoretical equations that is able to predict the location, size, and direction of underground structures through electric field analysis are suggested at the previous study (Ryu., 2015). Three field tests were performed for predicting the location, size, and direction of underground structures and the existence and size of sink-hole. Prediction results were reflected at the design and follow-up measures were performed.
Downy Mildew of Astragalus membranaceous Burge Caused by Peronospora trifoliorum de Bary
Ryu, Kyoung-Yul,Kim, Jeom-Soon,Hahm, Young-Il The Korean Society of Plant Pathology 2001 Plant Pathology Journal Vol.17 No.5
A severe down mildew of Astragalus membranaceus occurred in Gangwon province in 1999 and 2000. Symptoms developed on young leaves and shoots, showing grayish white mycelium on the lower leaves. The infected plants had reduced internodes and twisted leaflets when the disease was severe. Peronospora trifoliorum was identified as the causal agent of the disease based on mycological characteristics. Pathogenicity of the fungus was confirmed by artificial inoculation. This is the first record of downy mildew on astrgal plant caused by Peronospora trifoliorum in Korea.
Silver Scurf of Potato Caused by Helminthosporium solani
Ryu, Kyoung-Yul,Hahm, Young-Il,Kim, Jeom-Soon,Park, Chun-Soo The Korean Society of Plant Pathology 2000 Plant Pathology Journal Vol.16 No.6
Potate tubers with slver scurf lesions were collected from the cold storage at Pyungchang, Kangwon province in Korea. The causal agent of the silver scurf was identified as Helminthosporium solani by mycological characteristics of conidia and conidiophores. Pathogenicity of the fungus was confirmed by artificial inoculation on the potato tuber. This is the first report of potato silver scarf by Helminthosporium solani in Korea.
( Yul Taek Jeon ),( Ki Hyun Ryu ),( Min Kyoung Kang ),( Si Hyung Park ),( Ho Seop Yun ),( Q. T. Pham ),( Soo Un Kim ) 한국응용생명화학회 2010 Applied Biological Chemistry (Appl Biol Chem) Vol.53 No.1
Appressorium formation pathway of Magnaporthe grisea (M. grisea) is a new target for developing rice blast controlling agent. Inhibitory activity of endophytic fungi against the appressorium formation of M. grisea was screened. Two compounds displaying the activity were isolated from Alternaria tenuissima and Alternaria sp. isolated from the leaves of Acacia mangium and were identified as alternariol monomethyl ether and (4S)-α,β-dehydrocurvularin with IC50s of 51.0 and 10.6 μg/mL, respectively. These compounds were of no practical implication due to its low activity. However, they would serve as biochemical tool to study appressorium development.