토마토 품종간의 오존 감수성 비교

구자형,원동찬,조정희,신대식 忠南大學校 環境問題硏究所 1998 環境硏究 Vol.16 No.-

Seven cultivars of tomato were exposed to 0.15μL/L ozone for 20 hours to determine differences in sensitivity. Based upon the degree of foliar injury, the highest degree of sensitive cultivars were 'Daehyongboksu' and 'Goangsu'. Four cultivars, 'Goangmyong', 'Pungyoung' and 'Pinkglory' including 'Pinkforcer' were separated into intermediate sensitive group. 'Neabyongjangsu' was the least sensitive of the 7 tomato cultivars tested. The degrees of ethylene production and epinasty of leaves were relatively consistent with the differences of sensitivity to ozone. However, stomatal and trichome density, transpiration rate, and activities of peroxidase and superoxide dismutase were not clearly related to the ozone sensitivity of cultivars.

유기농업에 있어서 부숙된 가축분뇨의 연속시비가 토마토 생산 및 토양중 양분함량에 미치는 영향

구자형,전대우 忠南大學校 環境問題硏究所 2001 環境硏究 Vol.19 No.-

농가에서 실시되고 있는 유기농업의 문제점을 파악하기 위하여 2년 동안 플라스틱 하우스 내에서 돈분 및 돈분과 계분을 혼합한 유기물을 30, 60, 120ton·ha^-1씩 시비하고 관행재배(화학비료시비)와 생육상태 및 수량을 비교하고 토양분석을 통하여 무기성분의 변화상태를 조사하였다. 1. 토마토 초장은 화학비료 시비구와 부숙퇴비 시비간에 차이가 적었으나 엽록소 함량의 감소는 부숙퇴비 처리구에 화학비료 시비구에 비해 더 빠른 것으로 나타났다. 1년차재배포장에서 2년 연속재배 포장에 비하여 생육초기의 초장이 더 큰 결과를 보였으나 엽록소 감소폭은 두 포장간에 차이를 보이지 않았다. 2. 1년 재배 포장에서는 화학비료시비에 비하여 30-60ton·ha^-1의 부숙퇴비의 시비에서는 수량이 적었으나 120ton·ha^-1의 시비에서는 많은 수량을 보였다. 유기농 재배를 2년 연속 실시한 포장에서 처음 시작하는 1년차 재배포장에 비하여 대체적으로 수량이 10%이상 증가하는 경향을 보였다. 돈분단용 또는 돈분과 계분의 혼합시비에 따른 수량의 차이는 보이지 않았다. 3. 토양중 유기물 함량은 부숙퇴비의 시비량이 많아질수록 높았으며 120ton·ha^-1이 2년연속 처리되었을 경우 9% 정도에 도달하였다. 토양내 질산태 및 암모니아태 질소 함량은 1년차 재배포장에 비하여 2년 연속재배 포장에서 더 일찍 소실되었으며, 인의 함량은 두 포장간에 비슷하였고 계분이 함유된 퇴비의 시비에서 많은 함량을 보였다. 칼륨은 2년 연속재배 포장에서 많은 량이 검출되었고 대체적으로 감소폭도 완만하였다. 4. 칼슘과 마그네슘의 함량은 년차별 재배포장간에 차이가 없었고 pH와 EC도 별다른 차이를 보이지 않았다. 그러나 시비량이 많아질수록 EC가 높아지는 경향을 보였고 120ton·ha^-1의 부숙퇴비 시비에는 2-2.5mS·cm^-1이상의 높은 수준을 보였다. To improve the present organic farming practices in Korea, experiments for successive years in the plastic house were performed to compare the effects of composted swine manure alone, swine and fowl manure mixture with treatments of 30, 60, 120 tonㆍha_-1, and conventional farming practices on growth and yield in tomatoes. The contents of organic matter and mineral in soil were also studied throurgh a chemical analysis. Although little difference of plant height was found between chemical fertilizer and composted animal manure treatments, chlorophyll contents of plants were rapidly reduced in composted manure treatment. Between composted manure treatments in terms of 1 yr cropping field and 2 yrs cropping field, plant height at the early stage of growth was higher in the former field but there was no difference in chlorophyll loss. The total yields per plant of 1 yr cropping field with 30-60 tonㆍha_-1 of composted manure treatment were lower than that of chemical fertilizer treatment but not in the field of 120 tonㆍha_-1. There was a yield increase of more than 10% in 2 yrs cropping field of composted animal manure application than that of 1 yr cropping field but no clear difference was found between sources of manures. Organic matter contents of sojil were increased up to approximately 9% in 2 yrs cropping field applied with 120 tonㆍha_-1 of composted manures. Nitrogen contents of nitrate and ammonium types were rapidly decreased in 2 yrs cropping field than in 1 yr cropping ones. Even though the levels of phosphorous content were similar between cropping years, there was a tendency of higher phosphorous levels in the field applied with fowl manure in general. Potassium content was higher in 2 yrs cropping field and remained relatively at constant level during cultivation. No clear differences were found in contents of calcium and magnesium, pH and electrical conductivity (EC) regardless of cropping years. However, the level of EC was increased along with the increase of application amount of composted manures and that was ranged from 2.0 to 2.5 mSㆍ㎝_-1 in the field applied with 120 tonㆍha_-1.

Sodium Hypochlorite 처리가 좀부들의 종자발아에 미치는 영향

구자형,송지원 忠南大學校 環境問題硏究所 2002 環境硏究 Vol.20 No.-

습지에서 채취한 후 실온에 보관한 좀부들(Typha orientalis Presl) 종자의 자연발아율은 7%미만에 불과하였다. GA_3용액 50 및 100 mg·L^-1에 침지한 종자는 30℃의 광조건에서 약간의 발아촉진 효과를 보였으나 암 조건에서는 농도 및 발아온도에 관계없이 발아촉진 효과를 보이지 않았다. Sodium hypochlorite(NaOCl) 4% 용액에 시간별로 처리한 종자를 온도를 달리하여 발아시킨 결과 2시간 처리종자는 30℃에서, 3시간 처리 종자는 25℃에서 90%이상의 발아율을 보였다. 처리시간이 4시간 또는 6시간인 종자의 경우는 30℃에서 파종 후 1일 또는 3일만에 90%이상의 발아율을 보인 반면 20℃에서는 9일에 걸친 전체 발아율이 83%에 지나지 않았다. NaOCl처리는 종피의 색깔을 짙은 갈색에서 황색으로 탈색시켰고 종피를 매끈하게 부식시키는 결과를 보였다. 좀부들 종자에 대한 NaOCl에 의한 발아율 증진은 결국 탈색과 부식에 의한 투수성 증대에서 얻어진 효과로 판단된다. The seed germination of Typha orientalis was less than 7% when seeds were stored at room temperature after harvest from wetland. The percentage of germination was increased to 15% by 100 ㎎ㆍL_-1 gibberelline(GA_3) treatment at 30℃ under light condition, but there was no increase of germination under dark condition regardless of germination temperature and GA_3 concentration. Seeds treated with sodium hypochlorite(NaOCl, 4% available chlorine) for 2 h and 3 h were germinated more than 90% within I and 3 days after seeding at 30℃ in the respective seeds treated for 6 and 4 h. However, the total seed germination for 9 days after seeding was only 83% at 20℃ even though seeds were treated for 6 h. Sodium hypochlorite bleached the seed coat from dark brown to yellow in color and scarified evenly seed surface. These results suggest that the stimulation of seed germination in Typha orientalis by NaOCl treatment may be derived from the increase of water permeability through bleaching and scarifying the seed coat.

農藥 및 大氣汚染物質이 果樹의 花粉發芽 및 花粉管伸張에 미치는 影響

具滋馨 충남대학교 대학원 1977 論文集 Vol.9 No.-

The experiment was carried out in order to determine the effect of fungicides and insecticides which are used for fruit thinning, and air pollution substances on pollen germination and pollen tube growth. Complementary effect of Ca ion against air pollution substances was also investigated. The results obtained are as follows; 1) Fungicide Difolatan-Wp like lime-sulfur greatly inhibited pollen germination and pollen tube growth but Polyram-combi-Wp and Topsin_Wp did not affect them. 2) The chemical responses to each varieties of apple were less sensitive than others. Among them var. Jonathan was especially less affected by chemicals but there were no significant diffrsences between varieties. 3) The effect of Sevin and Dipterex-Wp on pollen germination was slight but Sumithion-Ec significantly inhibited pollen germination. 4) In most cases air pollution substances inhibited pollen germination and pollen tube growth. No germination was observed at 5-10 times higher concentrations than those of which were showed inhibitive effect. 5) Ca ions promoted pollen germination and pollen tube growth in most fruit trees. Especially there was significant Ca effect in pollen tube growth of peach trees. 6) Ca ions provided protective effect against inhibition of pollen growth due to NH₃ NO₂ and HF but no Ca effect was observed in SO₂ and HCL conditions.

고분자 키토산 처리가 딸기 과실의 품질과 부패에 미치는 영향

황용수,구자형 충남대학교 농업과학연구소 2004 농업과학연구 Vol.31 No.2

This study was aimed to determine the effect of high molecular weight chitosan treatment on the decay incidence and fruit quality in strawberries. Preharvest spray of chitosan (0.2%) effectively reduced the incidence of grey mould and increased fruit firmness. Chitosan application was also effective on remaining of surface gloss. This is probably due to coating effect. Physiological disorders were not found in treatment of 4 sprays. Internal quality such as soluble solid content and acidity seemed not to be affected by chitosan application. The effect of chitosan on keeping freshness was clear in fruit without physical damage at harvest, but muck less effective in injured fruit. Postharvest application of chitosan did not affect fruit quality. Above results indicated that chitosan is an alternative to keep strawberry quality through delaying decay and keeping firmness.

Common dental anomalies in Korean orthodontic patients: An update

Ja Hyeong Ku,Byoul Han,Jaehyun Kim,Jiyoung Oh,Yoon-Ah Kook,Yoonji Kim 대한치과교정학회 2022 대한치과교정학회지 Vol.52 No.5

Objective: The aim of this study was 1) to investigate the prevalence and pattern of dental anomalies (DAs), 2) to compare DAs according to the type of malocclusion, and 3) to investigate the correlation between tooth impaction and other DAs in the Korean orthodontic population. Methods: A total of 3,240 orthodontic patients were classified as Class I, Class II, or Class III malocclusion groups. The presence and location of common DAs, including impaction, microdontia, agenesis, supernumerary tooth, transposition, and fusion, were identified by examining diagnostic records. Furthermore, samples were classified as Group 1 without impaction or Group 2 with impaction. The prevalence of other DAs concurrent with impaction was investigated and compared to Group 1. Results: Impaction was the most prevalent DA, followed by microdontia, agenesis, and supernumerary. Class I and Class III groups showed the same order of prevalence, but agenesis was more frequent than microdontia in the Class II group. The prevalence of the four DAs was lowest in the Class III group. Overall, 8.6% of patients were classified into Group 2. The incidence of DAs other than impaction and the prevalence of multiple concurrent DAs were significantly higher in Group 2. Impaction showed a significant relationship with supernumerary tooth, transposition, and fusion. Conclusions: The prevalence and pattern of DAs varied depending on the type of malocclusion. As there was a higher risk of other DAs in patients with impacted teeth, early detection of the impacted tooth and a detailed diagnosis of other possible DAs may be essential.

Alleviation of Sulfur Dioxide Injury in Snap Bean Plants by Uniconazole

Ku Ja Hyeong(구자형),Krizek Donald T.,Mirecki Roman M. 한국원예학회 1996 Horticulture, Environment, and Biotechnology Vol.37 No.6

Sodium Hypochlorite 處理가 시금치 種子發芽에 미치는 影響

具滋馨(Ku Ja Hyeong),金泰日(Kim Tae Il),全大雨(Jun Dae Woo) 한국원예학회 1996 Horticulture, Environment, and Biotechnology Vol.37 No.3

AgNO₃ 處理가 개나리의 SO₂ 가스 被害 輕減에 미치는 影響

具滋馨(Ja Hyeong Ku) 충남대학교 농업과학연구소 1982 農業技術硏究報告 Vol.9 No.2

Sodium Hypochlorite 처리에 의한 부들 종자의 발아촉진

구자형(Ja Hyeong Ku),송지원(Ji Won Song),이혜정(Hye Jung Lee) 한국원예학회 2002 한국원예학회 학술발표요지 Vol.2002 No.3