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        • KCI등재

          한국산(韓國産) 이탄(泥炭)과 토양부식물(土壤腐植物) 획분(劃分)의 흡수(吸收)스펙트럼 및 관능기(官能基)의 함량(含量)

          임선욱,문무상,Lim, Sun-Uk,Moon, Moo-Sang 한국토양비료학회 1983 한국토양비료학회지 Vol.16 No.4

          한국산(韓國産) 이탄(泥炭), 화산회토(火山灰土) 및 무기질(無機質) 답토양(畓土壤)에 유기물(有機物)에 대(對)한 일련의 토양화학적성상(土壤化學的性狀)의 비교연구(比較硏究)로부터 본(本) 실험(實驗)은 김포(金浦), 평택(平澤), 김제(金堤) 및 영동(永同)의 이탄(泥炭)과 제주도(濟州島) 화산회토(火山灰土) 그리고 수원(水原)의 답토양(畓土壤)으로부터 각각(各各) 부식물(腐植物)을 유출(油出)하고 Hymatomelanic acid와 Humic acid로 분획(分劃)하여 가시(可視), UV 및 IR 광역(光域)에서 흡수(吸收) Spectra를 측정(測定)하여 비교(比較)하여 보았다. Humic acid와 Hymatomelanic acid는 UV 및 가시광역(可視光域)에서 극대(極大)나 극소(極小)의 Peak를 가지지 않으며 파장(波長)의 감소에 따라 단조로운 Optical density의 증가를 보이는 Spectra를 나타내었다. 또한 이탄(泥炭) 및 화산회토(火山灰土)와 답토양(畓土壤) 부식물간(腐植物間)의 흡수(吸收) Spectra는 이 범위의 광파장역(光波長域)에서 별다른 상이성(相異性)이 없었으나 화산회토(火山灰土), 이탄(泥炭), 무기질(無機質) 답토양(畓土壤)의 순(順)으로 완만(緩慢)한 경사(傾斜)를 이루었다. Humic acid와 Hymatomelanic acid의 IR spectrum의 주요한 흡수대(吸收帶)는 $3400cm^{-1}$, $2900cm^{-1}$, $1720cm^{-1}$, $1625cm^{-1}$, $1400-1450cm^{-1}$, $1200-1250cm^{-1}$, $1050cm^{-1}$ 등이며 토양형간(土壤型間)의 상이점(相異點)은 미미(微微)하나 Hymatomelanic acid는 파수(波數) $2900cm^{-1}$에서 흡수(吸收) peak를 가지며 파수(波數) $1720cm^{-1}$ 부근에서의 흡수(吸收)가 $1625cm^{-1}$ 부근보다 큰 반면에 Humic acid는 $1625cm^{-1}$ 부근이 $1720cm^{-1}$ 부근보다 큰 흡수(吸收) band를 이루었다. Humic acid의 관능기(官能基)의 함량(含量)은 공시(供試)된 토양형(土壤型) 사이에 큰 차이(差異)가 없었으나 화산회토(火山灰土), 이탄(泥炭), 무기질(無機質) 답토양(畓土壤)의 순(順)으로 전산도(全酸度)가 낮았고 Carboxyl기(基)의 함량(含量)이 적었다. To characterize humus fractions in soil, visible, ultraviolet and infrared absorption spectra of humic acids in alkaline solutions and hymatomelanic acids in ethanol solutions extracted by Stevenson's method from paddy rice soils, peats, and volcanic ash soils were analyzed. The spectra patterns of both fractions in visible and ultraviolet ranges did not have any peak and the absorbance decreased as the wavelength increased. Visible and ultraviolet spectra of the solutions from all the peats, volcanic ash soils and paddy rice soil were very similar each other but absorbances were slowly declined in the order of volcanic ash soils, peats and mineral paddy soils. The infrared spectra of the two solutions appeared in a typical pattern, showing a few broad peaks. The main absorption bands were in the regions of $3400cm^{-1}$ (hydrogen bonded OH), near $2900cm^{-1}$ (aliphatic CH), $1720cm^{-1}$ (C=O of COOH, C=O of carbonyl), $1625cm^{-1}$ (aromatic C-C conjugated with C=O and/or COO-), $1400-1450cm^{-1}$ (CH stretch), $1200-1250cm^{-1}$ (CaO stretch of phenolic OH or OH-deformation of COOH) and $1050cm^{-1}$. The hymatomelanic acid fractions, however, had spectra that were characterized especially by very distinct absorption at $2900cm^{-1}$ and $1720cm^{-1}$, for aliphatic CH and carbonyl stretching vibration respectively in addition to the weaker bands for COO- or aromatic CH vibration at $1625cm^{-1}$, as compared to humic acid. No differences were noted in the general patterns of the spectograms of both fractions extracted. Analyses of the functional groups revealed little differences between peats and paddy soils, although total acidity and the content of carboxyl groups were decreased in the order of volcanic ash soils, peats and mineral paddy soils.

        • KCI등재

          결명자(決明子)(Cassia tora L.) 엽(葉)과 종자(種子)의 추출물(抽出物)과 휘발성분(揮發成分)의 타감성(他感性) 생육저해작용(生育沮害作用)

          임선욱,김금숙,사동민,Lim, Sun-Uk,Kim, Geum-Sook,Sa, Tong-Min 한국토양비료학회 1992 한국토양비료학회지 Vol.25 No.2

          본 실험은 결명자(決明子)(Cassia tora L.)의 재배지에서 타작물이나 잡초의 생육이 저해되는 현상이 단순한 물리적 조건의 경쟁뿐 아니라 타감작용(allelopathy)에 기인함을 탐색함과 동시에 결명자의 자가독성을 확인하는 연구로서, 결명자 식물의 종자와 잎의 수용성 추출액 및 휘발성분이 무우(십자화과), 벼(화본과), 녹두(두파)등의 발아와 유묘성장에 미치는 영향을 살펴 본 결과는 다음과 같다. 1 결명자 종자의 수용성 타감물질에 의한 저해효과에 대해, 벼는 발아보다 유묘성장이 더욱 민감하게 저해되었고, 반면 무우는 발아가 배축의 길이 성장보나 더 민감하게 저해되었다. 2. 결명자 종사의 수용성 추출액 처리에 의해 추출액의 처리농도가 커질수록 벼 유묘의 엽록소 함량은 무처리구의 50%에서 65%까지 감소하였다. 3. 결명자 잎의 수용성 추출액 처리에 의해 무는 배추길이와 생체량이, 벼는 발아가 저해되었으나, 녹두는 단지 생체량에서 약간의 저해를 보였다. 4. 결명자 미숙종자의 휘발성분은 무우의 발아와 생육에 저해작용이 있으며, 특히 뿌리의 생장이 발아나 배축성장보다 더 민감하게 저해되었다. 5. 결명자 잎의 휘발성 성분은 무우, 벼, 녹두의 발아나 생육에 저해적인 타감작용 효과를 나타냈으며, 특히 발아보다는 유묘의 성장이 더 많이 저해되었다. 6. 결명자 잎의 휘발성분에 의해 결명자 스스로의 발아와 유근 성장이 저해되는 자가중독 현상이 확인되었다. 7. 결과적으로, 결명자의 종자와 잎에는 일부 타식물에 대하여 타감작용과 아울러 자가중독을 유발하는 수용성 및 휘발성 물질이 존재하는 것으로 인정된다. The growth of weeds and some other plants has been considered to be inhibited by sicklepod(Cassia tora L.) sharing the habitat. The study was conducted, for the first time, to propose that this phenomenon is not only due to competition for physical and nutritional conditions but also due to allelopathy. In addition, autotoxicity of sicklepod was examined. The results are summarized as follows. 1. Rice sheath length reduced progressively from 18 % to 36 % with increasing the concentration of treating aqueous extracts of sickle pod seeds, but rice germination was not affected. In contrast, radish hypocotyl length was not reduced by the aqueous extract treatment but radish germination was significantly reduced by 66 % at 1 : 10 and 1 : 5 treatment. 2. Total chlorophyll contents in rice seedling decreased from 50 % to 65 % by treatment of seed aqueous extracts diluted from 1 : 50 to 1 : 5 ratio. 3. Aqueous extracts of sicklepod leaves significantly reduced hypocotyl length and fresh weight in radish and germination in rice, but mung bean was slightly affected by aqueous extracts only in fresh weight. 4. Volatiles from fresh, immature seeds with husk reduced the radish germination and seedling growth and radish root growth appeared to be more sensitive to the exposure to volatiles from fresh immature seeds than both germination and hypocotyl growth. 5. Volatiles from sickepod leaves inhibited germination and growth of radish, rice and mung bean, and seedling growth was more sensitive to volatiles from leaves than germination. 6. Volatiles from sicklepod leaves reduced germination and radicle length of sicklepod itself. 7. Collectively, it is concluded that there are water-soluble and volatile substances responsible for allelopathy in sicklepod.

        • SCIEKCI등재

          두과작물 근류균에 대한 생리 및 생화학적 연구 : Ⅰ. 근류균 균주의 특성과 접종시험 Ⅰ. Some charateristics of isolated strains of Rhizobia and inoculation test on soy bean

          임선욱 한국농화학회 1970 Applied Biological Chemistry (Appl Biol Chem) Vol.13 No.1

          On the basis of the specific interrelationship between the species or variety of leguminous crops and the species or strain of nodule bacteria, Rhizobia, the rhizobial species and strain must be effectively chosen for the successful inoculation. The present paper describes on some results of the isolation and taxonomic study on the native rhizobial strains isolated from the nodules of five species of leguminous crops such as numerous varieties of soy bean, lespedeza, birdfoot trefoil, ladino and red clovers. The isolated strains of soy bean nodule bacterium, Rhizobium japonicum were grouped through the inoculation test on variety Changdanbaikmock into the effective, noneffective and toxic strain for the nodule formation. In the study of the effect of some inorganic and organic nitrogenous compounds on the growth of Rhizobium japonicum strain Ac 20, a promotive response was showed by asparagine, and glutamine, but hydroxylamine, nitrite, hydrazine and azide was inhibitory at the concentration of 10^(-2)M/ℓ in mannitol-yeast extract basal medium. In the physiological characteristics each strain showed somewhat different activities of the indole-3-actic acid formation and hydrogenase and discussed with these characters in relation to nodule forming ability.

        • SCIEKCI등재

          농경지 토양중에서 요소의 동태에 관한 연구 [제1보] : 답토양(沓土壤)에서 농약제가 요소의 분해 및 전환에 미치는 영향 Effects of some pesticides on the urea decomposition and nitrogen transformation in flooded paddy soil

          임선욱,박성오,강규영 한국농화학회 1977 Applied Biological Chemistry (Appl Biol Chem) Vol.20 No.1

          A laboratory experiment was carried out with loamy paddy soily under flooded condition to study the effects of some pesticides on the decomposition rate of urea and the transformation of nitrogen. The pesticides used in this study are ten kinds, which are usually applicable for rice cropping. The soil was treated with 200ppm of fertilizer urea-N and different levels of pesticides and then incubated at 28±1℃ for two weeks. The kinds of pesticides used in this study were three kinds of herbicides (2,4-D, Machete and TOK), three kinds of fungicides (Rabcide, Neo-asozine and Phenazine) at the levels of 20,100 and 200ppm and four kinds of insecticides (Birlane, Diazinon, Sumithion and Bux) at the levels of 50, 250 and 500ppm. respectively. The results obtained may be summarized as follows. 1. The treatments of herbicides and fungicides show little effect on the decomposition rate of urea at the levels of 20 and 100ppm, but by the treatment of 200ppm it was retarded markedly after one day incubation aside from Rabcide and Neo-asozine. The decomposing rate of urea was inhibited weakly by the treatment with 250ppm of Sumithion and Bux, however, 500ppm of all kinds of insecticides treated in this study brought about strong inhibitory effect (over 50%) after only one day incubation. The applied urea was disappeared nearly completely in three days in all cases with and without pesticides. 2. The production o ammonium-N was increased with the increase of pesticide concentrations gradually through two weeks and otherwise in the control sample a loss of inorganic-N resulted in about 20% extent. 3. The inhibitory effect of the all applied pesticides on the nitrification under flooded condition was observed markedly and may be ordered as insecticides, herbicides and fungicides according to its inhibiting action.

        • SCIEKCI등재

          한국토양의 유효인산량 검정을 위한 화학적 방법에 대한 연구

          임선욱,정종배,사동민 한국농화학회 1986 Applied Biological Chemistry (Appl Biol Chem) Vol.29 No.1

          At present, the definition and chemical analysis method of available soil phosphorus for plants have not been standardized because of the complexity of crop and soil characteristics in Korea and many analysis methods have been suggested with different extraction conditions. Suitable analytical method of available soil P should be established by the trial of various methods based on crop nutrition and soil conditions. To establish the most suitable analysis method of available soil P, a pot experiment with young maize was conducted over 44 different upland soils collected over the land of Korea. The amount of uptaken P by the plant was determined by ten different chemical methods for the available soil P. The results obtained were as follows: 1. Total phosphorus content in the sample soils ranged 533∼4917 ppm, and showed significant positive correlation with the content of organic matter. 2. The P consent was relatively low in the acid sulfate soil and very high in the volcanic ash soil although both types of soil contained high level of orgic matter. 3. The amount of extractable P determined by ten different methods were varied more or less, and the ratios of the extractable P to the total soil P were in the range of 1∼48%. 4. The relative values to the amount of extractable soil P by different methods were in the order of H₂O(5min.)(10.) $lt; H₂O(60min.)(2.27) $lt; NH₄HCO₃(5.57) $lt; NaHCO₃(7.42) $lt; Double lactate(9.71) $lt; Bray No.1(12.53) $lt; Lancaster(17.63) $lt; Nelson(25.96) $lt; AcOH(27.6) $lt; CAL-method(50.27). 5. The amount of extractable P determined by all of applied methods was very low in acid sulfate soil, volcanic ash soil and coarse textured soil. 6. Soil pH and total soil P generally showed significant positive correlation with the chemically extracted P, and soil organic matter was negatively correlated with the determined by Nelson-and CAL-method. Olsen method which showed significant correlation with exchangeable calcium seemed to be recommendable for calcareous soils. 7. Total amount of uptaken P by young maize through continuous twice cropping was 4.05% of total soil P in average, and the uptake in the second cropping was twice as much as that of the first cropping. 8. Three determination methods, i.e. Soltanpour-, Double lactate-, and Bray No. 1-method seemed to be more suitable than Lancaster method which is widely practiced at present in Korea. However, further study should be carried out with other crops and soils to most adequate chemical method for determination of available soil P.

        • SCIEKCI등재

          음지식물 인삼(Panax ginseng C . A . Meyer) 의 엽색소 구성에 대한 비교 연구

          임선욱,이미경 한국농화학회 1986 Applied Biological Chemistry (Appl Biol Chem) Vol.29 No.2

          The differences of pigment compositions in leaf chloroplast between sun and shade plant were analyzed to investigate the photo-induced destructive effects on shade species under the strong light. Ginseng was selected as a C-3 shade plant, soybean as C-3 sun species and corn as C-4 malate forming sun species. To study the effects of light, ginseng was divided into two subgroups; the 1 and 2 lines received sunlight a little more than those of 3 and 4 lines. Total amounts of chlorophylls, carotenes and xanthophylls were not considerably different among 3 and 4-lined ginseng, soybean and corn. However, the amounts of the three components of 1 and 2-lined ginseng and the chlorophylls content in corn leaves were smaller than those of others. The molar ratio of lutein to total carotenoids was significantly high in ginseng, that of violaxanthin was considerably high in corn and that of neoxanthin the highest in 1 and 2-lined ginseng among tested samples. Chlorophylls to carotenes ratio was 16.0 and highest in ginseng, 13.2 in soybean and 12.0 in corn. In 1 and 2-lined ginseng, the molar ratios of lutein and carotenes were lower while those of neoxanthin and violaxanthin were higher than those of the samples of more light. It was noticeable that an antheraxanthin-like epoxy carotenoid detected in soybean and corn leaves extracts was not observed in ginseng leaf extract.

        • SCIEKCI등재

          농경지(農耕地) 토양중(土壤中)에서 요소(尿素)의 동태(動態)에 관(關)한 연구(硏究) 제1보[第一報]-답토양(沓土壤)에서 농약제(農藥濟)가 효소(酵素)의 분해(分解) 및 전환(轉換)에 미치는 영향-

          임선욱,강규영,박성오,Lim, Sun-Uk,Kang, Kyu-Young,Park, Sung-O 한국응용생명화학회 1977 Applied Biological Chemistry (Appl Biol Chem) Vol.20 No.1

          본(本) 시험(試驗)은 현재(現在) 우리나라에서 질소질(窒素質) 비료(肥料)의 주종(主種)인 요소(尿素)가 전(田)과 답토양중(畓土壤中)에서 겪는 화학적(化學的) 변화(變化)와 행동(行動)을 추구(追究)하는 일련(一連)의 실험(實驗)가운데 담수상태(湛水狀態)의 답토양(畓土壤)에서 수도작(水稻作)에 주(主)로 쓰히는 제초제(除草劑), 살균제(殺菌劑) 및 살충제(殺蟲劑)의 수종(數種)이 요소(尿素)의 분해속도(分解速度)와 질소(窒素)의 화학적형태(化學的形態)의 변화(變化)에 미치는 영향을 검토(檢討)한 것이다. 공시(供試)한 농약(農藥)은 제초제(除草劑)로 2, 4-D, Machete, TOK 등의 삼종류(三種類), 살균제(殺菌劑)로는 Rabcide, Neo-asozine, Phenazine 등의 3종류(三種類)를 각각(各各) 20, 100, 200ppm을 일정량(一定量)의 답토양(畓土壤)에 200pprn의 요소비료(尿素肥料)와 함께 처리(處理)하여 $28{\pm}1^{\circ}C$에 정치(靜置)하여 변화(變化)를 조사(調査)하여쓰며 살충제(殺蟲劑)로는 Birlane, Diazinon, Sumithion 및 Bux의 4종류(四種類)를 각각(各各) 50, 250, 500ppm으로 처리(處理)하였으며 얻은 결과(結果)는 다음과 같다. 1. 제초제(除草劑)와 살균제(殺菌劑)를 각각(各各) 20, 100ppm으로 처리(處理)하였을 경우 처리(處理) 1일후(日後)까지는 요소(尿素)의 분해(分解)에 큰 영향을 끼치지 않았고 200ppm처리(處理)에서는 Rabcide와 Neo-asozine을 제외(除外)하고 그밖의 약제(藥劑)에 의하여는 현저히 저해(沮害)되었다. 살충제(殺蟲劑)로 Sumithion과 Bux는 250ppm 처리로 약간 저해(沮害)되었고 500ppm 처리에서는 공시(供試)한 모든 살충제(殺蟲劑)에 의하여 크게 저해(沮害)되었다. 그러나 요소(尿素)는 본실험조건(本試驗條件)에서 처리(處理) 3일후(日後)에 농약(農藥)의 처리(處理)에 관계(關係)없이 거의 완전(完全)히 분해소실(分解消失)되었다. 2. 어느 경우에나 암모늄태질소(態窒素)의 생성(生成)은 기수상태(基水狀態)에서 점차 증가(增加)되었으나 대조(對照) 2주후(週後)에는 대략 20%의 무기태질소(無機態窒素)가 감소(減少)되었으며 농약(農藥)의 처리농도(處理濃度)가 높을수록 암모늄 태질소(態窒素)의 현저한 증가(增加)가 2주(週)째에 나타났다. 그러나 Rabcide에 의하여는 오히려 억제(抑制)되었다. 3. 공시(供試)한 농약재(農藥劑)의 처리(處理)로 담수상태(湛懲水狀態)에서 ($NO_2+NO_3$)-N의 생성(生成)이 억제(抑制)되었고 그 억제효과(抑制效果)는 약제별(藥劑別)로 차이(差異)가 있어 대체(大體)로 살균제(殺菌劑), 제초제(除草劑), 살충제(殺蟲劑)의 순(順)으로 감소(減少)되었다. A laboratory experiment was carried out with loamy paddy soily under Hooded condition to study the effects of some pesticides on the decomposition rate of urea and the transformation of nitrogen. The pesticides used in this study are ten kinds, which are usually applicable for rice cropping. The soil was treated with 200ppm of fertilizer urea-N and different levels of pesticides and then incubated at $28{\pm}1^{\circ}C$ for two weeks. The kinds of pesticides used in this study were three kinds of herbicides (2,4-D, Machete and TOK), three kinds of fungicides (Rabcide, Neo-asozine and Phenazine) at the levels of 20,100 and 200ppm and four kinds of insecticides (Birlane, Diazinon, Sumithion and Bux) at the levels of 50,250 and 500ppm. respectively. The results obtained may be summarized as follows. 1. The treatments of herbicides and fungicides show little effect on the decomposition rate of urea at the levels of 20 and 100ppm, but by the treatment of 200ppm it was retarded markedly after one day incubation aside from Rabcide and Neo-asozine. The decomposing rate of urea was inhibited weakly by the treatment with 250ppm of Sumithion and Bux, however, 500ppm of all kinds of insecticides treated in this study brought about strong inhibitory effect (over 50%) after only one day incubation. The applied urea was disappeared nearly completely in three days in all cases with and without pesticides. 2. The production of ammonium-N was increased with the increase of pesticide concentrations gradually through two weeks and otherwise in the control sample a loss of inorganic-N resulted in about 20% extent. 3. The inhibitory effect of the all applied pesticides on_the_ nitrification under flooded condition was observed markedly and may be ordered as insecticides, herbicides and fungicides according to its inhibiting action.

        • SCIEKCI등재

          인산결핍이 대두근류의 bacteroid 함량과 energy 상태에 미치는 영향

          임선욱,사동민,Israel, Daniel W 한국농화학회 1992 Applied Biological Chemistry (Appl Biol Chem) Vol.35 No.6

          Experiment were conducted to determine the effect of phosphorus stress on bacteroid content and energy status of soybean (Glycine max [L.] Merr.) nodules. Plants inoculated with Bradyrhizobium japonicum MN 110 were grown with P-stressed (0.05 mM-P) and control (1 mM-P) treatment in the greenhouse. Phosphorus stress decreased nodule mass per plant and nodule mass to whole plant mass ratio. Phosphorus concentration in leaf, stem and root tissues were reduced by 75% but in nodule tissue was reduced only by 40% under phosphorus stress during 3 week experimental period. The bacteroid content per unit nodule mass and the distribution of total nitrogen and total phosphorus among the bacteroid and plant cell fractions of nodule were not affected significantly by phosphorus stress. Regardless of phosphorus treatment, 22% of the nitrogen and 27% of the phosphorus in whole nodules were associated with the bacteroid fraction. The ATP and total adenylate concentrations in and energy charge of whole nodule were decreased 77%, 46% and 37%, respectively, by phosphorus stress. The ATP concentration in and energy charge of the host plant cell fraction of nodules were decreased 86% and 59%, respectively, but these parameters in bacteroid in nodules were not affected by phosphorus stress. These results indicated that nodule is a strong phosphorus sink and that nodule growth and development are regulated to maintain a high phosphorus and energy content in bacteroid even when the host plant is subjected to phosphorus deficiency.

        • KCI등재

          답토양중(畓土壤中) Cadmium의 형태별(形態別) 분포(分布)와 현미중(玄米中) Cadmium 함량(含量)과의 관계연구(?係硏究)

          임선욱,김선관,Lim, Sun-Uk,Kim, Sun-Kwan 한국토양비료학회 1983 한국토양비료학회지 Vol.16 No.1

          연(鉛) 아연광산(?鉛?山) 인근답중(隣近畓中) Cd오염(汚染)이 심(甚)할 것으로 여상(予想)되는 지점(地点) 36개소(個所)에서 토양(土壤)과 현미(玄米)를 수도수확기(水稻收穫期)에 동시(同時)에 채취(採取)하여 토양중(土壤中) Cd을 $KNO_3$ 침출성(浸出性)(치환태(置換態)), NaF 침출성(浸出性)(흡착태(吸着態)), $Na_4P_2O_7$ 침출성(浸出性)(유기태(有機態)), EDTA 침출성(浸出性)(Carbonate태(態)), $HNO_3$ 침출성(浸出性)(Sulfide태(態)), 비침출성(非浸出性)(불용태(不溶態))로 분별분석(分別分析)하여 이들 형태(形態)의 Cd과 토양특성(土壤特性)과 관계(?係) 및 현미중(玄米中) Cd 함량(含量)과의 관계(?係)를 조사(調査)한 결과(結果)는 다음과 같다. 1. 형태별(形態別) Cd 분포비(分布比)는 토양특성(土壤特性)에 따라 차이(差異)가 심(甚)하나 평균치(平均値)를 보면 유기태(有機態)가 대략 44%, 불용태(不溶態)가 약 6%, 기타형태(其他形態)는 10~15% 범위(範?)였다. 2. pH가 높은 토양(土壤)일수록 치환태(置換態) Cd은 낮아지나 유기태(有機態) 및 Carbonate태(態) Cd은 증가(增加)하는 경향(傾向)이고 타형태(他形態)의 Cd은 pH에 따른 변화(?化)를 보이지 않았다. 3. 유기물(有機物) 함량(含量)이 높은 토양(土壤)일수록 유기태(有機態) Cd만 增加하고 흡착태(吸着態)를 제외(除外)한 다른 형태(形態)의 Cd은 감소(減少)하는 경향(傾向)이었다. 4. CEC와 Cd 형태별(形態別) 분포(分布)와의 관계(?係)는 유기물(有機物) 함량(含量)에 따른 Cd의 분포양상(分布樣相)과 유사(類似)하였다. 5. 현미중(玄米中) Cd은 유기태(有機態) Cd과 가장 높은 정(正)의 상관(相?)을 보였으며, Carbonate태(態) Cd도 유의성(有意性)있는 정(正)의 상관(相?)을 보였으나 다른 형태(形態)의 Cd와는 유의성(有意性)있는 상관(相?)을 보이지 않았다. The object of this study was to investigate the distribution of Cd fractions in paddy soils in relation to some soil characteristics and to find out the relationships between soil Cd fractions and Cd content in brown rice. Thirty six soils and rice samples were collected from the paddy field adjacent to zinc mining sites at harvest time in 1981. Total Cd content of brown rice samples was analyzed. A sequential extraction procedure was used to fractionate Cd in soils into the designated forms of exchangeable, adsorbed, organically bonded, carbonate, sulfide, and residual Cd. The results obtained were as follows: 1. The distribution of Cd fractions in soil showed a wide difference depending on soil properties. As an average value it was observed that organically bonded Cd amounted 43.7%; residual Cd, 6.5%; and other fractions, 10-15%. 2. With higher soil pH, organically bonded and carbonate Cd fraction tended to be higher but exchangeable fraction lower. Other forms of Cd showed no difference with soil reaction. 3. Organically bonded fraction was positively correlated with soil organic matter content, while others except adsorbed fraction showed an adverse tendency. 4. The relation of fraction distribution to soil C E C was similar to the case of organic matter. 5. Cadmium content in brown rice showed significant possitive correlation with organically bonded Cd content (r = 0.655) and carbonate, Cd content of soil (r = 0.328) but there was no significant correlation with contents of other forms.

        • SCIEKCI등재

          참깨 볶음조건이 참기름의 향미에 미치는 영향

          임선욱,이영근,김정욱 한국농화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.6

          Sesame seeds were roasted for 30, 60, 90, and 120 min at different temperatures (100, 200, and 300℃) and extracted to investigate an adequate condition for producing the high quality sesame oil. Sesame seeds roasted at 200℃ for 90 min gave the high yield of oil. The oil contained the low content of brownish-black precipitates and exhibited an excellent organoleptic quality when judged by descriptive sensory analysis. Thirty one volatile flavor compounds, which are the largest number of volatiles among the oil samples prepared, were identified from the oil sample. The oil contained relatively high concentrations of furfurals (sweet candy-like flavor) and pyrazines (roasted-like flavor), that are considered as good contributors to sesame seed oil flavor, and low concentations of aldehydes (C5∼C10) and ketones, which are considered as bad contributors (oxidized fat-like and painty-like flavors). These results suggest that the roasting condition of 200℃ for 90 min was the best for the oil production in terms of the overall aroma and taste quality under the test conditions.

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