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        • Silver Ion 處理가 植物의 오존가스 皮害輕減에 미치는 效果

          金忠洙,具滋馨 忠南大學校 環境問題硏究所 1995 環境硏究 Vol.3 No.2

          The production of stress-induced ethylene was investigated in various plants injured by ozone expo- sure. Concurrently the effects of silver ion on reducing ethylene synthesis and action and foiiar injury caused by ozone exposure were examind in some plants. 1. There was a significant correlation between the amount of ozone-induced stress ethylene production and foliar injury rates. But the correlation between the peak time of ethylene production and foliar injury rates showed no significance. 2. Stress-induced ethylene accelerated the defoliation of forsythia injured by ozone exposure. Silver ion treated after ozone exposure reduced the induction of defoliation by ozone damage. 3. Reduction of ozone injury by silver ion in plants seems to be resulted from the role of some bio- chemical tolerance-enhancing processes in addition to inhibition of ethylene synthesis and action. 4. Silver thiosulfate reduced ozone injury in tomato even if it was sprayed at leaves, and it did not inhibit the growth of stem cuttings of tomato at proper concentration and immersion time. The production of stress-induced ethylene was investigated in various plants injured by ozone exposure. Concurrently the effects of silver ion on reducing ethylene synthesis and action and foliar injury caused by ozone exposure were examind in some plants. 1. There was a significant correlation between the amount of ozone-induced stress ethylene production and foliar injury rates. But the correlation between the peak time of ethylene production and foliar injury rates showed no significance. 2. Stress-induced ethylene accelerated the defoliation of forsythia injured by ozone exposure. Silver ion treated after ozone exposure reduced the induction of defoliation by ozone damage. 3. Reduction of ozone injury by silver ion in plants seems to be resulted from the role of some biochemical tolerance-enhancing processes in addition to inhibition of ethylene synthesis and action. 4. Silver thiosulfate reduced ozone injury in tomato even if it was sprayed at leaves, and it did not inhibit the growth of stem cuttings of tomato at proper concentration and immersion time.

        • 상자파종에 의한 규격화된 잔디의 생산

          구자형,김태일,전대우,최종명 한국잔디학회 1995 한국잔디학회지 Vol.9 No.3

          The objective of this research was to produce sod by box seeding for zoysiagrass or by vegetative propagation for zoysiagrass and manilagrass.1 Various ratio of peatmoss to sand(v /v) were prepared to find idea[ medium for fast and light weight sod production. Then, the days required for sod formation, the effect of growth regulators on the growth of turfgrass, and the various storage methods for winter keeping of sods were also investigated. 1.The mixed medium of sand and peatmoss(v /v, 1 : 2) showed more biomass production than that of sand. 2.In comparison of seeding rate of zoysiagrass, the amount of log /$m^2$ was most effective in the fast and dense sod formation. The amount of 20g /$m^2$ also showed fast sod formation. But, it resulted in weak plant and less tillering. During April to June, about 100 days were required to form sod with seeding rate of 5g /$m^2$ regardless of seeding time. Whereas 80 days were required to form sod in the rate log /$m^2$, which was 20 days shorter than that of 5g /$m^2$. 3.More than 85% of shoots in sod stored in field or plastic house during the winter time resumed the growth in good appearance after transplanting. The whole covering of ground with sod resulted in less weeds and faster formation of lawn. 4.Vegetative propagation of manilagrass showed about 7 to 15 days faster formation of sod than that of zoysiagrass. Application of GA increased shoot growth and BA increased the total number of tillering. However, the effects of the combined application of GA and BA were negligable.

        • KCI등재

          AgNO<sub>3</sub> 처리(處理)가 개나리의 SO<sub>2</sub> 가스 피해(被害) 경감(輕減)에 미치는 영향(影響)

          구자형,Ku, Ja Hyeong 충남대학교 농업과학연구소 1982 Korean Journal of Agricultural Science Vol.9 No.2

          In order to investigate the effect of $AgNO_3$ pretreatment on reducing $SO_2$ injury in leaves of Forsythia koreana, changes of pH, chlorophyll content, peroxidase activity, sulfur content, and stomatal behaviour in leaves were examined. 1. $AgNO_3$ sprayed at 200 ppm or above increased black spot development in lower epidermis of leaves. But pretreatment with 100 ppm $AgNO_3$ significantly reduced de foliation and visible injury rate of leaves exposed to $SO_2$. 2. $AgNO_3$ pretreatment prevented lowering pH and decreasing chlorophyll content induced by $SO_2$ injury in leaves. But both $AgNO_3$ pretreatment and $SO_2$ exposure increased peroxidase activity in leaves. 3. $AgNO_3$ pretreatment did not affect reducing $SO_2$ absorption and stomatal opening in leaves exposed to $SO_2$. 개나리에 있어서 $AgNO_3$ 용액살포(溶液撒布)가 $SO_2$가스의 피해경감(被害輕減)에 미친는 효과(效果)를 시험(試驗)하였던 바 다음과 같은 결과(結果)를 얻었다. 1. $AgNO_3$ 용액(溶液)은 살포농도(撒布濃度)가 200 ppm 이상으로 되면 잎의 뒷면에 미세(微細)한 흑색반점(黑色斑點)을 발생(發生)시켰으며 100ppm으로 처리(處理)되었을 때 $SO_2$가스 피해(被害)로 일어나는 낙엽현상(落葉現狀)과 가시피해(可視被害)를 현저(顯著)히 경감(輕減)시켰다. 2. $AgNO_3$ 용액살포(溶液撒布)는 $SO_2$가스 피해(被害)로 발생(發生)되는 pH의 저하(低下)와 chlorophyll 함량(含量)의 감소현상(減少現狀)을 억제(抑制)시켰으며, peroxidase의 활성(活性)을 증가(增加)시켰다. 3. $AgNO_3$ 용액(溶液)의 살포(撒布)는 $SO_2$가스의 흡수(吸收)와 기공(氣孔)의 개폐(開閉)에 영향(影響)을 미치지 않았다.

        • KCI등재

          SO<sub>2</sub>가스 피해(被害)에 의(依)한 조원수목(造園樹木)의 ethylene 발생(發生) 및 Ag ion에 의(依)한 ethylene 발생억제(發生抑制)

          구자형,서영교,Ku, Ja Hyeong,Suh, Young Kyo 충남대학교 농업과학연구소 1980 Korean Journal of Agricultural Science Vol.7 No.1

          Ethylene production and inhibition of ethylene production by Ag ion were investigated in ornamental trees injured by $SO_2$ exposure. Concurrently the sulfur content of leaves was measured to examine the absorption of $SO_2$. The results were summarized as follows: 1. Ethylene production by leaves of Pinus thunbergii and Cedrus deodara showed peak after 2 - day exposures to $SO_2$ when visible injury was not appeared ; whereas in Taxus cuspidata showed continuos increase even after 4 - day exposures and was markedly stimulated at leaves appeared visible injury. The amount of ethylene production by leaves of Cedrus deodara and Taxus cuspidata was higher than those of Pinus thunbergii. 2. Ag ion applied on leaves at concentration of 100 ppm $A_gNO_3$ significantly inhibited ethylene production by leaves of Cedrus deodara either $A_gNO_3$ sprayed before $SO_2$ exposure or after leaves were injured by $SO_2$ exposure. 3. The sulfur content of leaves after 5 - day exposures to $SO_2$ showed higher in Pinus thunbergii and Cedrus deodara than in Taxus cuspidata, but there were no great differences in the sulfur content among untreated species. 곰솔, 개잎갈나무, 주목 등의 조원수목(造園樹木)에 있어서 $SO_2$가스 피해(被害)에 의한 ethylene 발생(發生) 및 에 의한 ethylene 발생억제효과(發生抑制效果)를 조사(調査)하고 아울러 $SO_2$ 가스 처리종료후(處理終了後) 엽(葉)의 유황함량(硫黃含量)을 분석(分析)하였던 바 다음과 같은 결과(結果)를 얻었다. 1. 곰솔과 개잎갈나무에서는 $SO_2$ 처리(處理) 2일후(日後)에 가장 많은 ethylene 발생량(發生量)을 보였으나 주목은 처리(處理) 4일후(日後)까지도 계속 증가(增加)하였다. ethylene 발생량(發生量)은 곰솔에 비(比)하여 개잎갈나무와 주목에서 현저(顯著)히 많았으며 곰솔과 개잎갈나무에서는 가시적(可視的) 피해반점(被害斑點)이 나타나기 전(前)에 많은 양(量)이 발생(發生)하였으나, 주목에서는 피해반점(被害斑點)이 나타난 후(後)에 다량(多量)이 발생(發生)되었다. 2. Ag ion은 $SO_2$ 가스 처리전(處理前)의 잎이나 처리후(處理後) 피해엽(被害葉)에 살포(撒布)한 경우 모두 ethylene 발생(發生)을 현저(顯著)히 억제(抑制)시켰으며 100ppm의 $A_gNO_3$ 용액(溶液)을 살포(撒布)했을때 가장 효과(效果)가 컸다. 3. 잎의 유황함량(硫黃含量)은 무처리구(無處理區)에 있어서는 수종간(樹種間) 차이(差異)가 크지 않았으나 $SO_2$ 가스 처리후(處理後)에는 주목에 비(比)하여 곰솔과 개잎갈나무에서 다소(多少) 높은 함유량(含有量)을 보였다.

        • KCI등재

          몇가지 사과품종(品種)의 신초(新梢)에 미치는 SO<sub>2</sub> 가스의 피해(被害)

          구자형,Ku, Ja-Hyeong 충남대학교 농업과학연구소 1979 Korean Journal of Agricultural Science Vol.6 No.2

          In order to examine $SO_2$ injury to apple shoots, cutting shoots of five cultivars were exposed to 3 ppm $SO_2$ in vase life conditions. 1. The most sensitive cultivar to $SO_2$ was 'Rall's Genet', and 'Starking' was most tolerant among cultivars tested. 2. Ethylene production of shoots showed peak after 8 hours exposure, when visible injury was not appeared, and was decreased with increase in exposure time. 'Rall's Genet' showed slower decrease in ethylene production than other cultivars. 3. Chlorophyll a, b and a/b ratio were decreased in all cultivars after 40-hr exposures to 3 ppm $SO_2$ and greatly decreased in 'Rall's Genet' compared to other cultivars. $SO_2$가스가 사과 Golden Delicious, 축(祝), 국광(國光), Starking, 홍옥(紅玉)등의 신초(新梢)에 미치는 영향(影響)을 조사(調査)하였던 바 다음과 같은 결과(結果)를 얻었다. 1. $SO_2$ 가스에 대한 저항성(抵抗性)은 Starking이 가장 높았고 국광(國光)이 가장 낮았다. 2. Ethylene 발생량(發生量)은 가시적(可視的)인 피해(被害)가 나타나지 않은 8시간 처리후(處理後)에 가장 많았으며 처리(處理)시간이 길어짐에 따라 현저(顯著)히 감소(減少)하였고 국광(國光)에서 가장 완만(緩慢)한 발생량(發生量)의 감소(減少)를 보였다. 3. Chlorophyll a,b 그리고 a/b ratio는 국광(國光)에서 가장 높은 감소(減少)를 보였고 기타의 품종(品種)들도 감소(減少)하는 경향(傾向)을 보였다.

        • KCI등재
        • KCI등재

          호텔객실상품 소셜커머스 특성요인이 관계몰입과 구매의도에 미치는 영향: 소셜커머스 관여도의 조절효과를 중심으로

          구자형,한진수 (사)한국관광레저학회 2019 관광레저연구 Vol.31 No.4

          This study aims to identify the influence of social commerce factors and relationship commitment on purchase intention in hotel room product. The study examines the moderating role of social commerce involvement between social commerce factors and relationship commitment. Furthermore, this study analyzes the positive effects between relationship commitment and purchase intention. Total of 270 social commerce consumers responded to the questionnaire. The frequency, EFA, reliability, multiple and simple regression, hierarchial regression analysis tests were used for data analysis. As a result, the social commerce factors had a positive significant influence on relationship commitment. Second, the relationship commitment had a positive significant influence on purchase intention as well. Third, the results of the moderating role of social commerce involvement showed a significant influence on both the social commerce factors and relationship commitment. Finally, both the academic and practical implications in hotel room product in social commerce are also discussed in the end.

        • KCI등재

          Uniconazole과 Silver Thiosulfate 處理가 강남콩의 오존 被害 輕減에 미치는 效果

          具滋馨,元東瓚,趙正熙,申大植 충남대학교 농업과학연구소 1992 농업과학연구 Vol.19 No.2

          Studies were conducted to examine the effects of single or combined treatment of uniconazole [(E)-1-(4-chlorophenyl)-4, 4-dimethyl 2(1, 2,-4-triazol-1-yl)-1-penten-3-ol)] and silver thiosulfate (STS) on reducing ozone injury to snap beans (Phaseolus vulgaris L. `Strike'). Two weeks after seeding, plants were given a soil drench of uniconazole(XE-1019) solution at concentrations of 0.001, 0.005 and 0.025 mg/pot. and then two days prior to ozone fumigation. 0.3 and 0.6 mM STS containing 0.01% Tween-20 were also sprayed. Uniconazole was effective in providing protection against ozone injury through increase activities of free radical scavengers such as superoxide dismutase (SOD) and peroxidase (POD) as well as the increase of chlorophyll content and stomatal resistance resulted from plant growth retardation. The phytoprotective effects of STS seemed to be related to its properly of blocking the ethylene action and increasing activities of SOD and POD. Even at low concentrations, a combined treatment with uniconazole drench, STS spray significantly reduced ozone injury compared to single application.

        • KCI등재
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