• 한국환경과학회지
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• 제14권5호
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• pp.481-490
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• 2005

Surface sediments and seawater were sampled at Masan and Haengam Bays of Korea, to evaluate contamination by sewage-derived organic matter using fecal sterols, Six stream-water samples into Masan and Haengam Bays were also sampled. Total concentrations of eight sterols (coprostanol, epichloestanol, epicoprostanol, cholesterol, cholestanol, brassicasterol, stigmasterol and $\beta-sitosterol$) were in the range of $1,274\~4,768{\mu}g/g$ dry weight in suspended particulate from the stream-water, $292\~2,244{\mu}g/g$ dry weight in suspended particulate from the seawater and $4.5\~27.2{\mu}g/g$ dry weight in the sediments. Although sterol compositions in sediments, seawater and stream-water were different, cholesterol was the predominant sterol in all samples. The proportion and concentration of coprostanol, a sewage tracer, in stream-water was much higher than those in sediment and seawater. The sterol levels including coprostanol in the sediments and seawater were higher at inner basin than at the outer bay. Some molecular indices and multivariate statistical analysis were used to assess the origin of these sterols and sewage contamination in the study area. The sterol composition patterns in stream-water were mainly associated with contamination by sewage-derived organic matters and those of seawater were associated with the activities of marine-originated organisms. Sterol levels in the sediments were both from the sewage input through stream-water and the marine- originated organisms. This survey suggests that the main source/route of sewage-derived organic matters in Masan Bay is the input of stream-water into the bay.

• 한국작물학회지
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• 제41권1호
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• pp.62-67
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• 1996

본 실험은 비중선으로 종자밀도를 5등급으로 세분한 뒤 각 등급별 유묘의 유관속 발달 및 생육 특성에 미치는 영향을 구명하기 위하여 인디카형인 IR58과 자포니카형인 운봉7호를 공시하여 수해한 결과는 다음과 같다. 1. 종자의 밀도가 1.00이하에서 1.20이상으로 높아질수록 유묘의 엽신과 엽초에 발달된 유관속수와 크기가 증가하는 경향이었다. IR58은 운봉7호보다 유관속수와 크기가 양호하게 발달하였다. 2. 유묘의 생육특성인 초장, 엽수, 근수 및 근장은 종자의 밀도가 1.20이상까지 높아질수록 증가하였다. 3. 엽신과 엽초에 발달된 유관속수는 건물중과 고도로 유의한 정의 상관관계를 나타냈으며, 제4, 5엽신의 대유관속수는 엽신폭과 유의한 정상관을 보였다. 4. 종자의 밀도가 높아질수록 유묘의 유관속 발육을 좋게 하며 양수분의 원활한 이동으로 인하여 생육이 양호하게 건묘육성에 바람직하였다.

• Food Science and Biotechnology
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• 제14권6호
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• pp.828-831
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• 2005

The content of vitamin $D_2$, including its precursor ergosterol, was determined in some cultivated mushrooms to manufacture fortified Doenjang (Korean traditional soybean paste) with vitamin D by supplementation with mushroom. Ergosterol was the most abundant sterol in the mushrooms (50 to 140 mg/100 g dry weight) but the ergocalciferol portion made up only 0.065% (Pleurotus eryngii) to 2.5% (stipe part of Lentinus edodes, shiitake) of the total vitamin $D_2$ of each mushroom. Changes in these compounds in L. edodes caused by UV or solar irradiation were also evaluated. Ergocalciferol content in the pileus part of L. edodes went up to $424\;{\mu}g/100\;g$ dry weight and ergosterol levels reached 139.3 mg per 100 g dry weight at maximum levels. Ergocalciferol content increased about 50% when exposed to solar radiation and increased 377% with UV irradiation. These compounds level in Doenjang was enriched as much as supplied UV irradiated L. edodes powder to before fermentation, and the supplemented mushroom did not influence the palatability of Doenjang.

• 한국작물학회지
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• 제30권3호
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• pp.294-300
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• 1985

본 실험은 강보리·올보리·수원 18호 3개 정종을 공시하여 24시간 장일의 온실조건과 자연조건에서 지상부와 지하부의 형태변화를 비교·조사함으로써 맥류 육종에서의 세대단축재배에 활용할 수 있는 기초자료를 얻기 위하여 실시하였으며 그 결과는 다음과 같다. 1. 생육초기의 지상부 건물중은 자연조건에 비하여 온실조건에서 급격히 증가하고, 출수후에는 반대로 온실조건에서 낮았다. 2. 주당 엽면적은 자연조건에서 컸고, 근의 산화력은 온실조건에서 높았다. 3. 지하부의 건물중은 자연조건에 비하여 온실조건에서 현저히 작았고 지하부 건물중이 최대에 이르는 시기는 자연조건에서는 출수 4주후, 온실조건에서는 출수 7 주후였다. 4. 지하부에 대한 지상부의 비율(T/R ratio) 은 온실조건에서는 생육이 진전됨에 따라 계속 증가하는 경향이었고, 자연조건에서는 분얼개시기 까지는 감소하다가 그 이후 성숙기 까지는 증가하는 경향이었다.

• 한국산림과학회지
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• 제70권1호
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• pp.63-71
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• 1985

제1대(第一代) 잡종(雜種) 포플러 Populus alba ${\times}$ Populus glandulosa $F_1$의 우량(優良) clone을 선발(選拔)하기 위해, 서울대학교(大學校) 농과대학(農科大學) 묘포장(苗圃場)에서 밀식재배(密植栽培)(20,000본(本)/ha)한 2, 3년생(年生) 각각(各各) 13, 15 clones을 대상(對象)으로 생장(生長)과 이에 관련(關聯)된 과산화효소(過酸化酵素) 및 질산환원효소(窒酸還元酵素)의 활성(活性)을 조사(調査) 비교(比較)하였다. 개체당(個體當) 건중량(乾重量) 개체당(個體當) 엽면적(葉面積)에 있어서는 clone간(間) 유의차(有意差)가 인정(認定)되었으나, 엽단위생중량당(葉單位生重量當)의 과산화효소(過酸化酵素) 및 질산환원효소(窒酸還元酵素)의 활성치(活性値)는 유의차(有意差)가 인정(認定)되지 않았다. 개체당(個體當) 건중량(乾重量)과 개체당(個體當) 엽면적(葉面積)과의 상관관계(相關關係)는 r=0.875, 개체당(個體當) 건중량(乾重量)과 개체당(個體當) 엽(葉)의 과산화효소(過酸化酵素)의 활성치(活性値)와는 r=0.854, 개체당(個體當) 건중량(乾重量)과 개체당(個體當) 질산환원효소(窒酸還元酵素)의 활성치(活性値)와는 r=0.914로 고도(高度)의 상관(相關)을 보였다. 1년생(年生) clone의 엽부위별(葉部位別) 엽단위생중량당(葉單位生重量當)의 과산화효소(過酸化酵素)와 질산환원효소(窒酸還元酵素)의 활성치(活性値)는 엽순서(葉順序)가 위에서부터 아래로 내려옴에 따라 증가(增加)하여 18번째와 33번째에서 각각(各各) 최대치(最大値)를 보였으며, 그 후 아래로 내려올수록 감소(減少)하는 경향(傾向)을 보였다. 2년생(年生) clones 65-29-19, 66-15-3, 65-22-11, 66-14-93, 66-26-55 등과 3년생(年生) clones 64-6-44, 66-14-99, 66-26-55, 65-22-11, 68-1-54 등이 개체당(個體當) 엽면적치(葉面積値), 엽단위면적당(葉單位面積當) 과산화효소(過酸化酵素) 및 질산환원효소(窒酸還元酵素)의 활성치(活性値)가 다른 clone들보다 높아서 양호(良好)한 생장능력(生長能力)을 가졌다고 말할 수 있다. 제1대(第一代) 잡종(雜種) 포플러, Populus alba ${\times}$ Populus glandulosa $F_1$의 유시생장(幼時生長)을 개체당(個體當) 엽면적(葉面積), 개체당(個體當) 엽(葉)의 과산화효소(過酸化酵素) 및 질산환원효소(窒酸還元酵素)의 활성치(活性値)로 추정가능성(推定可能性)을 보였으며, 이러한 사실(事實)로 보아, 엽면적(葉面積)과 엽(葉)의 과산화효소(過酸化酵素) 및 질산환원효소(窒酸還元酵素)의 측정치(測定値)는 본(本) 잡종(雜種) 포플러의 우량(優良) clone을 선발(選拔)하는 하나의 기준(基準)으로 이용(利用)될 가능성(可能性)을 보인다.

• 한국축산식품학회지
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• 제23권4호
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• pp.315-320
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• 2003

A total of 240 crossbred(Landrace ${\times}$ Yorkshire ${\times}$ Duroc) pigs were housed from 70 kg live weight and slaughtered at weights of 95, 105, 115 and 125 kg. The left side loins of carcass were obtained at 24 hr postmortem to measure pork quality. There were significant differences(p<0.01) in eye muscle area of pork loins between the slaughter weights of 95 and 105 kg. However, no differences were observed in pork than 105 kg of slaughter weight. Ultimate pH values were decreased with increasing slaughter weight and cooking loss was also reduced(p<0.01) at the heavier weights. Slaughter weights did not affect the shear force and intramuscular fat. However, dry matter(DM) and crude protein(CP) contents of loin were increased, and cooking loss and sarcomere length were decreased with increasing slaughter weight. The lightness(L$^{*}$) and redness(a$^{*}$) of pork loin were increased with increasing slaughter weight. Results suggested that pork quality may be improved when pig slaughter weight is increased from 95 to 125 kg.

• International Journal of Industrial Entomology and Biomaterials
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• 제7권1호
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• pp.45-49
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• 2003

Foliar treatment with different concentrations of potassium chloride (KCl) to mulberry plants resulted in higher level of total chlorophyll, total sugars, soluble protein, in vivo nitrate reductase activity (NRA), net photosynthetic rate (NPR), pWUE and leaf yield. Optimal concentration was found to be 10.0 mM KCl with limited irrigation provided in the mulberry plantation planted in 90 ${times}$ 90 cm spacing. The deleterious effect of soil moisture stress condition has been found to be overcome by KCl foliar spray twice at 15 days interval. Regression and correlation coefficients were analyzed, and a strong positive correlation was found between chlorophyll and total sugars, soluble protein and in vivo nitrate reductase activity, leaf dry weight and net photosynthetic rate and pWUE and net photosynthetic rate.

• Journal of Animal Science and Technology
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• 제47권3호
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• pp.355-362
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• 2005

This study was carried out to obtain basic information on variety selection for the utilization of whole crop rices(WCR) at National Institute of Crop Science, RDA, in 2004. Fifteen varieties and elite line were evaluated on feed value such as dry matter yield(DMY), crude protein( CP), acid detergent fiber(ADF), neutral detergent fiber(NDF) and total digestible nutrients(TDN). The dry matter yields were ranged from 13.23 to 17.83 ton per ha, the highest yielding varieties were Sobibyeo(l6.98ton / ha) in Japonica type, SR22060 (17.83 ton / ha) in New plant type, Hangangchalbyeo(I7.66 ton / ha) in Tongil type. Suweon 468 showed the highest value in the RFV and TDN content among the varieties, and Suweon 468, Suweon 498, Suweon 490 and SR22058 were chosen to have the high feed values through cluster analysis. The dry weight(grain) was found to be positively related with percent of the ripened grain, 1,000 grain weight and CPo TDN content was found to be positively related with CP, but negatively related with NDF and ADF. RFV was found to be negatively related with plant height, NDF and ADF. The promising rice varieties for WCR were Suweon 468, Suweon 498, Suweon 490 and SR22058 on the basis of CP, TDN and DMY.

• 한국작물학회지
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• 제47권3호
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• pp.221-225
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• 2002

본 연구는 벼 휴립건답직파 절수재매시 완효성비료의 효과를 알아보기 위하여 질소비료를 표준시비(N-160kg/ha) 대비 완효성비료(LCU: 18-12-13%)를 기비로 100%와 80% 시용구 및 기비로 60% 시용하고 속효성비료인 요소로 분얼비 또는 수비로 20%씩 각각 시용하여 시험한 결과를 요약하면 다음과 같다. 1. 생육기간중 지상부 생육은 LCU 100%에서 가장 컸고, LCU 시비량간에는 시비량이 많을수록 컸다. 2. 시비질소의 흡수량은 LCU 100%에서 가장 높았고 질소 시비효율은 LCU 60% + 수비(요소) 20% 시용구에서 가장 높았다. 3. 처리간 수량구성요소를 보면 $m^2$당 수수와 $m^2$당 립수는 LCU 100%에서 가장 많았고, 등숙비율과 현미 천립중은 비슷하였는데, 쌀 수량은 관행인 속효성 시비구 대비 LCU 100%에서 7% 증수되었다. 따라서 벼 휴립건담직파재배에서 관개수 부족시 절수재배가 필요하여 이때에 완효성비료로 시비할 경우 표준시비량(N-160kg/ha) 수준으로 시비해야 할 것으로 생각된다.

• 농업과학연구
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• 제45권3호
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• pp.401-409
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• 2018

A total of 459 broiler chicks were studied from 1 to 32 days of age to evaluate the effect of phytase diet supplementation on their growth performance, nutrient digestibility, and meat quality. Chicks were randomly divided into 3 treatments (9 replicates/treatment, 17 chicks/replicate). This was a 32 day experiment that included 2 phases: phase 1, grower (0 to 17 day); and phase 2, finisher (17 to 32 day). Dietary treatments were: T1, control basal diet (CON); T2, CON + 0.01% phytase (300 IU); and, T3, CON + 0.01% phytase (500 IU). Results showed that supplementation of the basal diet with phytase increased pH value of meat. During the period between day 7 and 17 of the study, T2 and T3 groups had higher body weight gain (BWG) than T1 group. After phase 2 and the use of finisher feed, T3 group had significantly improved BWG and feed intake (FI). During the whole experiment, T3 resulted in higher BWG and FI than other treatments. But feed conversion ratio was not affected by phytase supplementation throughout the experiment. Both T2 and T3 groups had significantly higher apparent total tract digestibility of dry matter when compared with T1. However, no differences were observed for Nitrogen, Ca, and P during the experiment. In conclusion, supplementation of phytase increased BW, FI, and apparent total tract digestibility (ATTD) of dry matter (DM). However, there was no significant influence in feed conversion ratio (FCR), relative organ weight and breast muscle quality.