• Journal of Animal Environmental Science
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• v.9 no.2
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• pp.79-84
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• 2003

1.퇴비 온도의 상승에 비례하여 폐사계 체내의 온도도 상승하여 퇴적식 퇴비단의 경우 $55^{\circ}C$내외의 고온지속기간이 약 30일정도 유지되었다. 반면에 토양 중에 매립된 폐사계의 체내 온도는 발효 전 기간 동안 $30^{\circ}C$ 이상으로 상승하지 못한 채 주변토양 온도와 거의 비슷한 수준을 유지하였다. 토양온도는 외기온의 변화에 즉각적인 반응을 보이지 않았다. 2. 시험용 발효조 내에서의 송풍여부에 따른 퇴비의 발효온도 변화추이는 송풍 처리구에서는 퇴비화 3일째에 최고온도 $68^{\circ}C$를 기록한 반면에 무송풍구에서는 퇴비화 5일째에 최고온도 $72^{\circ}C$를 기록하였다. 3. 퇴비단 표층에서 채취된 시료에서 검출된 $H_2S$와 $CH_3$SH 농도는 송풍 처리구에 있어서는 퇴비화 개시 후 20일 경과 후 각 각 28.5, 16.0 ppb 수준을 나타냈고 35일 경과 시에는 각각 57.7, 11.7 ppb, $CH_3SH$의 경우에는 23.7, 9.9 ppb 수준의 발생량을 기록하는 등 전반적으로 송풍처리구가 무송풍 처리구에 비해 악취가스의 발생량이 상대적으로 낮았다. 4. 폐사계를 밀폐용기 내에서 발표 시 수거된 침출수 중의 미생물 수가 토양매립 상태 하에서 수거된 침출수 중의 미생물 수보다 더 적은 경향을 보이고 있다. 5. 퇴비단 내에서 발효에 따른 폐사계 중량은 최초 3일간에 급격히 감소하고 시간의 경과에 따라 그 감소속도는 줄어든다. 발효온도가 높을수록 조직의 분해속도가 빨라지고 폐사계의 중량감소 속도도 빨라졌다. 6. 일반 퇴비와 폐사계를 발효시킨 퇴비 사이에 비료성분과 중금속 함량의 유의적인 차이는 발견되지 않았다.

• Journal of the Korean Society of Food Science and Nutrition
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• v.25 no.1
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• pp.21-26
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• 1996

본 연구는 streptozotocin 유발 당뇨쥐에서의 MFO계활성 변화 및 이에 지질과산화를 관찰하고자 체중이 140kg 내외의 Sprague-Dawley 종 흰쥐 숫컷을 대조군과 당뇨 유발 시험군으로 나누어 4주간 사육하였다. 당뇨군은 STZ로 당뇨를 유발시켰으며 당뇨 유발 6일후 쥐를 희생기켜 간조직 및 폐조직 microsome 중의 cytochrome $P_{450}$ 및 cytochrome $b_[5}$ 함량과 NADPH-cytochrome $P_{450}$ reductase 활성도를 측정하고 아울러 microsome내의 지질과산화물을 측정하여 다음과 같은 결과를 얻었다. 실험군간에 식이 섭취량은 차이가 없었으나, 체중 증가량과 식이 효율은 당뇨군이 STZ군에 비해 현저하게 감소하였다. 간장 및 폐조직의 무게는 대조군과 당뇨군간에 유의적인 차이는 없었다. 간조직 및 GP조직 중의 cytochrome $P_{450}$ 함량은 대조군에 비해 당뇨군이 150%, 175%씩 증가하였다. 간조직 및 폐조직 중의 cytochrome $b_{5}$은 대조군에 비해 당뇨군이 53%,116%씩 각각 증가하였다. 간조직에서의 NADPH-cytochrome $P_{450}$ reductase 활성은 당뇨군이 대조군에 비해 46% 증가하였으며, 폐조직에서는 75%증가하였다. 지질과산화물가는 당뇨군이 대조군에 비해 간족에서는 약 95% 높았으며 폐조직에서는 73%높았다. 이상의 결과에서 STZ 유발 당뇨쥐에서는 MFO system의 활성도가 대조군에 비해 현저하게 증가되고 지질과산화반응이 같으 srudgid이 촉진되었으며 폐조직에서도 간조직에서와 비슷한 경향이었다. 이러한 것은 당뇨군에서는 MFO system의 활성증가로 free radical 생성이 증가되고 그 결과 지질과산화가 촉진되었다고 볼 수 있다.

• Economic and Environmental Geology
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• v.36 no.5
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• pp.381-385
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• 2003

We investigated possible application of waste ferrite in treating Cd and Pb in wastewater. Adsorption of Cd and Pb on Mn-Ferrite are influenced by several controlling factors such as contact time, heavy metal concentrations, pH and temperature. Both Cd and Pb achieved adsorption equilibrium within 5 minutes. Based upon this kinetic data, 24 hours of contact time was allowed for other experiment. The adsorption of Cd and Pb was high at high pH and high ion concentrations. The reaction was also affected by temperature. Adsorption isotherms fits well with the Freundlich isotherm equation. pH is the main controlling factor in Cd, Pb adsorption on the Mn-ferrite. Cd showed S type adsorption curve while Pb showed sorption edges, depending on the Pb concentrations.

• Korean Journal of Food Science and Technology
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• v.22 no.1
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• pp.61-65
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• 1990

Comparison of induction times among the Rancimat Method, the Oven Test and the Weight Method were investigated, and the oxidation stability of perilla oil was determinated by the Rancimat Method. The induction times determinated by three methods using perilla oil show a good correlation. And the temperature dependence of the induction times of perilla oil was as follows. $t_p=e^{-0.0815T+9.183}$. The antioxidant effect of Tocopherols on the oxidation of perilla oil was not observed, and the antioxidant effect of the organic acids was increased in the order of Ascorbic acid>Ascorbyl stearate>Malic acid>Tartaric acid>Citric acid. The synergistic effect of Ascorbic acid (500 ppm)and Tocopherols was not observed below 200ppm of Tocopherols, but became larger with increasing Tocopherols level over 200ppm.

• Journal of The Korean Society of Grassland and Forage Science
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• v.12 no.2
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• pp.127-131
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• 1992

To find out the optimum fertilizer levcl for Job's Tears, Seungju local cultivar, experiment with six fertilizer levels was conducted on the experimental field of forage crop in Sunchon National University from Apr. 1989 to Aug. 1990. The results obtained were summarized as follows: I .Raising nitrogen(N) application rate up to 13.5 kg/lOa increased dry matter yield linearly. However, at high N application rate, 18 kg/lOa, plants were too leafy and parts of leaves and lodging were decreased. so that dry matter yield was decreased.2. The optimum application rate of fertilizers turned out to be 13.5-6-6 kg/lOa of $P_2O_5$, $K_2O$. Content of crude protein, yield of fresh and dry matter were the highest and that of crude fiber such as NDF. ADF and cellulose were the lowest at this rate.

• Korean Journal of Soil Science and Fertilizer
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• v.34 no.2
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• pp.92-97
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• 2001

Soil characteristics and crop productivity was compared between 5 soil physical treatment plots: check, reversion, subsoiling, explosive subsoiling and drainage in salt accumulated Gangseo Fine sandy loam soil from 1999 to 2000. Physical treatments of subsoil improved soil physical properties in the following order, reversion > drainage > explosive subsoiling > subsoiling > check. The effectiveness of physical treatment was sustained to the 2nd year after treatment. Soil moisture content of subsoil was highest in the reversion treatments and decreased in the order of drainage, subsoiling, and check. However there was little difference between treatments. The physical treatments increased fluctuation of soil moisture content. However the crop yield in the physical treatment plots were increased. It was considered that the increase of crop yield was caused by improvement of soil physical properties rather than soil water holding in the soil. An average increase rate of crop yield by physical treatments was 10 to 20 percent.

• Korean Journal of Poultry Science
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• v.39 no.1
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• pp.71-76
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• 2012

This study was carried out to investigate the performance of growing period of two-crossbred of Korean Native Chickens. A total of four hundred eighty female 2-crossbred chicks that restored strains and were aboriginal at National Institute of Animal Science. Treatments were four crossbreds (4 replications/crossbred, 30 birds/replication) as A) C strain ${\times}$ S strain, B) C strain ${\times}$ H strain, C) R strain ${\times}$ S strain, and D) L strain ${\times}$ H strain, respectively. Livability of C crossbred was the highest as over 90% and that of B crossbred was the lowest as 73~78% during growing period (P<0.05). Body weight of A crossbred was the highest at the 4 week and that of D strain was the lowest at the 4 and 8 week (P<0.05). Weekly body weight of B and C crossbreds were higher than A and D crossbreds (P<0.05). There was no significant difference among four crossbreds. Weekly feed intake of D crossbred was the highest among all crossbreds at 0~4 weeks (P<0.05). These results suggested the basic data on the record of growing phase of 2-crossbreed Korean Native Chickens.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.54 no.4
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• pp.357-365
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• 2009

On the purpose to improve the milling efficiency as well as head-rice percentage after milling, an experiment to improve the removal ability of immature kernels in the immature brown rice separator (IBRS) was performed focused on varietal characteristics. The removal ability of immature grains by the IBRS was absolutely depending on kernel thickness of brown rice. The kernel thickness of the tested rice varieties distributed from 1.79 mm in Nonganbyeo to 2.16 mm in Daeribbyeo 1. Although there were some variation among rice varieties, it was roughly suggested that the suitable sieve-slit widths for good separation of the immature kernels were 1.9 mm for the varieties thicker than 2.08 mm in thickness, 1.8 mm for the varieties with 2.00-2.08 mm thickness, 1.7 mm for the varieties with 1.90-2.00 mm thickness, and 1.60-1.65 mm for the varieties thinner than 1.7 mm. It was found out that the higher the proportions of immature kernels in brown rice, the more conspicuous the improvement of milling efficiency as well as head rice rates by their removals. With increasing the sieve slit-widths beyond an optimum range, the losses of mature grains increased sharply. For effective separation of immature kernels, it was suggested that the optimum sieve-slit width should be set up depending on both of the kernel thickness and the critical loss limit of mature kernel.

• Journal of The Korean Society of Grassland and Forage Science
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• v.19 no.4
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• pp.347-354
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• 1999

This experiment was carried out to determine the effect of maturity at harvest and inoculants on the quality of round baled rye(Secale cereale L.) silage at the experimental field of Grassland and Forage Crops Division, National Livestock Research Institute, RDA, Suwon in 1998. The experiment was consist of split-plot design with 3 replications. The main plots were 3 harvesting stages such as boot(20 April), heading(29 April), and flowering stages(14 May). The subplots wered inoculant treatments : control (untreated), inoculant A, and inoculant B. Acid detergent fiber(ADF), neutral detergent fiber(NDF), and in vitro dry matter digestibility (IVDMD) of rye silage were significantly increased with delayed harvesting date, but there was not significant difference between inoculants. Mean silage pH at flowering stage was the lowest(4.35), but the highest at early harvest(4.91). Inoculants significantly reduced acidity of silage compared with control. Dry matter(DM) content of the control was higher than that of inoculants. Ammonia-N as proportion of total N was below 10% which was maximum level of high quality silage. The addition of inoculants reduced ammonia-N. There were significant difference in organic acid contents between harvesting stages and inoculants. Lactic acid was increased with inoculants, but acetic and butyric acids were decreased. Various treatments increased colony forming unit(CFU) of lactic acid bacteria by 2 or 3 times compared with the control and the highest at flowering stage with inoculant B treatment. Results of this study indicate that use of microbial inoculant and harvesting after heading stage will improve the silage fermentation and quality of round baled rye silage.

• Korean Journal of Poultry Science
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• v.38 no.2
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• pp.137-144
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• 2011

The current work was carried out to investigate the effect of crossbred Korean native chickens (KNC) on fatty acid, amino acid and nucleotide-related compounds contents of chicken meat. A total of 360 male chicks (1d of age) was used in this work and were divided 4 groups as A) (KNC egg-meat type C strains ${\times}$ KNC meat type S strains) ${\times}$ Ross broiler, B) (KNC egg-meat type C strains ${\times}$ KNC meat type H strains) ${\times}$ KNC meat type S strains, C) (KNC native R strains ${\times}$ KNC meat type S strains) ${\times}$ KNC meat type H strains and D(White Semibroiler Chickens) strains for 5 weeks at the flat house. Palmitic acid and vaccenic acid were highest in C strain meat, and myristic acid and linolenic acid were lowest in A strain meat (p<0.05). Saturated fatty acid was lowest in C strain meats (p<0.05). Valine, leucine, phenylalanine and lysine of essential acid were low in A strain meat. Cystine, aspartic acid, glycine, alanine and proline were also low in A strain meat. Hypoxanthin (Hx) was high compared other strains at 5 weeks and low at 10 weeks. IMP was high compared other strains at 5 and 10 weeks. AMP has not significant difference among strains at 5 weeks but B strain was high other strains at 10 weeks. These results showed that C stain was excellent on the fact of nutrients compared to other strains. Consequently, the result of this work gave the basic data that needed to develope the new strains.