• Asian-Australasian Journal of Animal Sciences
• /
• 제24권9호
• /
• pp.1268-1273
• /
• 2011

The present study was conducted to determine a feasible method of protein concentrate extraction from rice bran (RBPC) and its effect as a substitution for skim milk in early weaning pig diets. An investigation to extract protein concentrate from full fat rice bran was undertaken to determine the best ratio of water and rice bran, the amount of NaOH and a HCl solvent to use in a simple paddle-type mixer with modified spinning to produce RBPC. The results stated that the best ratio for water mixing in the RBPC extraction process was 1:5 with 20 g NaOH and 30 min in a paddle-type mixer at 300 rpm. A mix of 250 ml 0.2 N HCl was optimum for neutralization and protein precipitation. After the fluid was spun out with a washing machine, the sediment was left for 12-14 hours to complete the filtration. One kilogram of rice bran could produce an average of 324.5 gram RBPC and it contained 3.40% ash, 496.48 kcal of GE/100 gram, 1.94% crude fiber, 28.20% ether extract, 7.64% moisture and 16.66% crude protein, respectively. A total of 45 crossbred piglets, weaned at 3 weeks of age were allotted into control diet (A) and dietary treatments formulated with a four different rates of RBPC substitution for skim milk at a percentage of 25 (B), 50 (C), 77 (D) and 100 (E) respectively, in a randomized complete block (RCB) design. All piglets had free access to feed and water until 8 week of age when the experiment ended. Feed intake, average daily gain, growth rate and feed efficiency were not affected by dietary treatments. Blood test parameters after completion of the growth trial indicated normal health. Even though the mean of cell hemoglobin concentration was significantly different between treatments (p<0.05) it was still within the normal range. The cost difference for BW gain of 100% RBPC substituted for skim milk in the weaning diet was approximately 35% lower than that of the control and the relative cost of production was 96.67, 92.85, 70.75 and 64.48% lower for the replacement of 25, 50, 75 and 100% of skim milk respectively. These results implied that this technology is feasible for use by small scale farmers to improve their self-reliance.

• 한국식품영양과학회지
• /
• 제28권5호
• /
• pp.1158-1163
• /
• 1999

The purpose of this research is to measure nutrition counseling effects for improving iron status. The major components of the nutrition counseling were iron, MPF(Meat, Poultry, Fish) and vitamin C rich diet therapy, the provision of nutrient supplements and eatting attitude education. Fifteen female volun teers participated and the mean level for hemoglobin(Hgb), hematocrit(Hct), serum iron(S Fe), total iron binding capacity(TIBC), serum ferritin(SF) of subjects was 11.9±1.3g/dl, 37.0±2.7%, 57.7 ±33.9 g/dl, 409.1±56.2 g/dl, 8.6±3.5ng/ml, respectively. To evaluate the effect of iron status improvement by the nutrition couseling, 10 subjective symptoms, hematological indice and eating attitude were measured after implementation the nutrition counseling. Some subjective symptoms such as 'cold hands and foot', 'slow to recover', 'reduced concentrate', 'poor memory', 'inflammed inner mouth' were improved significantly. The hemoglobin, hematocrit, mean cell volume(MCV), mean cell hemoglobin(MCH) and mean cell hemo globin concentration(MCHC) were increased significantly. And eating attitude was improved significantly as well. It is suggested from the results that the nutrition counseling of this study can be effective to improve iron status.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2007년도 추계학술대회 논문집
• /
• pp.47-51
• /
• 2007

The present paper reports the life time prediction of Acrylonitrile-Butadiene rubber (NBR) fuel cell gasket materials as a function of operational variables like acid concentration, ageing time and temperature. Both material and accelerated acid-heat aging tests were carried out to predict the useful life of the NBR rubber gasket for use as a fuel cell stack. The acid ageing of the gasket compounds has been investigated at 120, 140 and $160^{\circ}C$, with aging times from 3 to 600 h and increasing acid ($H_2SO_4$) concentrations of 5, 6, 7 and 10 vol%. Material characteristics the gas compound such as cross-link density, tensile strength and elongation at break were studied. The hardness of the NBR rubber was found to decrease with decreasing acid concentration at both 120 and $140^{\circ}C$, but at $160^{\circ}C$ interestingly the hardness of the NBR rubber increased abruptly in a very short time at different acid concentrations. The tensile strength and elongation at break were found to decrease with increase in both the acid concentrate ion & temperature. The life time of the compounds were evaluated using the Arrhenius equation.

• 한국태양에너지학회 논문집
• /
• 제39권4호
• /
• pp.25-39
• /
• 2019

Luminescent solar concentrator (LSC), consisting of luminophore included glass or substrate with edge-mounted photovoltaic cell, is semi-transparent, energy harvesting devices. The luminophore absorbs incident solar light and re-emit photons, while the waveguide plate allows re-emitted photons to reach edge or bottom mounted photovoltaic cells with reduced losses. If the area of LSC is much larger than that of photovoltaic cell, this system can effectively concentrate solar light. In order to improve the performance of LSC, new materials and optical structures have been suggested by many research groups. For decreasing re-abosprion losses, it is essential to minimize the overlap between absorption and photoluminescence solar spectrum of luminophoroe. Moreover, the combination of selective top reflector and reflective optical cavity structure significantly boosts the waveguide efficiency in the LSC. As a result of many efforts, commercially available LSCs have been demonstrated and verified in the outdoor. Also, it is expected to generate electricity in buildings by replacing conventional glass to LSCs.

• 대한의생명과학회지
• /
• 제30권1호
• /
• pp.10-16
• /
• 2024

Oxidative stress caused by elevated reactive oxygen species (ROS) in the heart causes various heart diseases. Oxidative stress is known as a factor that causes diseases in various organs as well as the heart. Diseases such as heart failure, myocardial infarction, and cardiomyopathy caused by oxidative stress in the heart can be treated with medication or surgery. Recently, blood cells concentrate (BCC) is used in various treatment areas such as orthopedics, gynecology, and urology. BCC therapy is applied to treatment by concentrating platelets and white blood cells necessary for regeneration through simple centrifugation using autologous blood. As the platelets are activated, many growth factors are released from alpha granules of the platelets. Growth factors such as TGF-β1, PDGF, VEGF, and EGF derived from platelets are involved in various cell signaling pathway. Due to these growth factors, BCC can contribute to tissue regeneration and can treat various diseases. CD34+ cells contained in BCC may also play an important role in tissue regeneration. In this study, we investigated whether BCC has a regenerative effect on heart disease, and if so, what mechanism causes the effect. To observe this, cardiomyocyte cells were treated with H₂O₂ to induce oxidative stress. And the effect was confirmed in the presence or absence of BCC. As a result, in the presence of BCC, the oxidative stress of cardiomyocyte cells was reduced and cell damage was also reduced. These results suggest that BCC therapy can be a new treatment alternative for heart disease.

• Preventive Nutrition and Food Science
• /
• 제9권2호
• /
• pp.138-143
• /
• 2004

Soybean curd residues (SCR) obtained from hot and cold manufacturing processes were fermented by indigenous microorganisms, Lactobacillus rhamnosus LS and Bacillus firmus NA-l for 15 h at 37$^{\circ}C$. The pH, acidity, viable cell counts, and tyrosine content were evaluated in samples with variations in sugar, starter and type of SCR. The raw Doowon SCR (D-SCR, cold-processed) fermented by indigenous microorganism had a 0.9% acidity and 6.7 ${\times}$ 10$^{7}$ CFU/g viable cell counts, compared with the 0.11 % acidity and 6.7 ${\times}$ 10$^{6}$ CFU/g viable cell counts of raw fermented Pulmuwon SCR (P-SCR, hot-processed). After fermentation of raw P-SCR with 1 % glucose and 1 % L. rhamnosus LS starter, the viable cell counts, tyrosine content and acidity were 4.7 ${\times}$ 10$^{8}$ CFU/g, 16.3 mg% and 0.9%, respectively. In addition, the raw P-SCR fermented with Bacillus firmus NA-l as co-starter had a 0.45% acidity, 2.4 ${\times}$ 10$^{8}$ CFU/g lactic acid bacteria, and 3.3 ${\times}$ 10$^{6}$ CFU/g Bacillus sp. In particular, the tyrosine content was increased 5 fold. The drying of fermented SCR was completed by hot-air drying (5$0^{\circ}C$) within 12 h; the dried P-SCR and D-SCR had 1.8 ${\times}$ 10$^{7}$ CFU/g and 5.3 ${\times}$ 10$^{6}$ CFU/g viable cell counts, respectively. The concentrate of methanol extract from fermented D-SCR inhibited the initial cell growth of E. coli, Staphylococcus aureus and Pseudomonas aeruginosa in liquid culture.

• 한국초지조사료학회지
• /
• 제24권1호
• /
• pp.43-52
• /
• 2004

본 실험은 사료급여 종류가 동절기 우유의 생산량 및 조성분에 미치는 영향을 규명하기 위하여, 1998년 10월 부터 1999년 3월까지 실시하였다. 실험구 처리는 볏짚구(볏짚 위주 조사료＋농후사료: T1)를 대조구로 하여 옥수수 사일리지구(옥수수 사일리지 위주 ＋ 농후사료:T2) 및 TMR구(완전혼합사료: T3)를 상호 비교하였으며 그 결과를 요약하면 다음과 같다. 1. 우유 생산량은 T2(31.9$\pm$3.2kg) > T3(29.6$\pm$3.8kg) > T1구(22.5$\pm$2.0 순으로 높게 나타났다 (P<0.05). 그리고 산차별 우유 생산량은 T2 및 T3구는 3산에서(P<0.01), T1구는 4산에서 높은 유량을 나타냈다. 2. 유지율은 T3구가 3.79$\pm$0.31%로 가장 높았던 반면 T1구는 2.64$\pm$0.20%(P<0.01)로 가장 낮은 함량을 보였으며, 산차별로는 2 산차가 높은 경향치를 보였다. 3. 단백질 함량은 사료종류에 따라 유의적인 차이는 없었지만 T1구(3.17%$\pm$3.56%)에 비하여 T2(3.25$\pm$0.05%) 및 T3구(3.29$\pm$0.10%)가 높은 경향을 나타났으며(P<0.05), 산차에 따라서는 뚜렷한 차이는 보이지 않았다. 4. 무지고형분 함량은 T3(8.74$\pm$0.18%)>T2(8.47$\pm$0.22%)>T1구(8.56$\pm$0.04%) 순으로 나타났으며, 총고형분 함량은 T3(12.51$\pm$0.57%)>T1(11.71$\pm$0.62%) > T2구(11.52$\pm$0.55%) 순으로 나타났다. 그러나 상호간 유의차는 없었다. 5. 체세포 수는 T1구가 39.6$\pm$4.6${\times}$$10^4$Cell/ml 로 가장 높은 수치를 보였던 반면 T2구는 28.7$\pm$4.4 ${\times}$ $10^4$ Cell/ml로 가장 낮게 나타났다. 이상의 결과를 종합해 볼 때 볏짚구(T1)에 비하여 TMR(T3) 및 옥수수 사일리지(T3) 급여체계는 유량 증대 및 우유성분 함량을 높이는 데 매우 효율적인 방안으로 나타났다.

• 농업과학연구
• /
• 제34권2호
• /
• pp.135-142
• /
• 2007

본 실험은 사료 첨가제로써 Bromelain과 Zn-methionine의 급여가 착유우의 산유량 및 체세포 수 함량에 미치는 영향을 규명하고자 실시하였다. 홀스타인 착유우 8두(대조구 4두 및 처리구 4두)를 공시하여 대조구는 기본 사료를 급여하고 처리구에서는 Zn-methionine 133g/kg(Zn 20 및 methionine 46.7g)과 bromelain 50g/kg(br 30g/kg)을 경구투여하였다. 그리고 시험은 착유우의 비유초기에 8주간 실시하였다. 본 시험에서 얻은 결과는 다음과 같다. 두당 평균 유량은 대조구(29.6kg)에 비하여 처리구(30.2kg)에서 높게 나타났다(P<0.05). 우유내 체세포수는 대조구($260.8{\times}10^3/ml$)에 비하여 처리구($179.8{\times}10^3/ml$)에서 현저하게 낮게 나타났다(P<0.05). 따라서 이들 첨가물의 급여는 착유우의 산유량을 증가시키고 우유의 위생상 지표가 될 수 있는 체세포수의 감소를 가져오는 결과를 얻었다.

• 한국통신학회논문지
• /
• 제31권3A호
• /
• pp.254-266
• /
• 2006

최근에 OFDM 기반 셀룰러 시스템의 Throughput 및 셀 커버리지를 향상시키기 위하여 SDMA(Spatial Division Multiple Access) 방식을 적용하는 자원 할당 방식에 대한 연구가 시작되고 있으나, 대부분의 OFDM/SDMA 기반 자원 할당 방식에 대한 연구는 시스템 Throughput 만을 최적화시키거나 단일 셀 환경에서만 적응이 가능한 한계가 있다. 본 논문에서는 사용자가 요구하는 트래픽 특성에 맞는 High Layer QoS(Quality of Service) 파라미터를 고려하면서, 시스템의 Throughput의 손실을 최소화하고 인접 셀 간 간섭을 고려하여 다중 셀 환경에서도 적용이 가능한 하향 링크 OFDM/SDMA 기반 자원할당 알고리즘을 제안하고, Ped A 및 다중 안테나 채널모델인 SCME (Spatial Channel Model Extensions) 채널에서 제안된 알고리즘 성능을 분석한다.

• 한국식품영양과학회지
• /
• 제35권10호
• /
• pp.1427-1433
• /
• 2006

본 연구에서는 콩 식품의 품질 및 가공적성을 최적화하기 위해 대두 이소플라본 추출물의 생리활성과 가공적성에 대한 실험을 수행하였다. 메탄을 추출 이소플라본의 free radical 소거능이 가장 우수하였고, 아질산 소거능은 메탄올, 에탄올과 열수추출물의 순으로 나타났다. ACE 저해작용은 이소플라본이 가장 많이 추출된 메탄올 추출물보다 열수추출물에서 더 큰 효과를 보였다. 또한, 한국인에게 호발하는 위암세포(SNU-1)과 대장암세포(SNU-C4)에 대한 이소플라본 및 대두 추출물의 항종양활성을 확인하였다. 대두 이소플라본이 가공제품이나 특수영양식품으로 가공될 때 문제가 될 수 있는 여러 조건별 안정성을 검토하기 위하여, 분말상태의 대두 이소플라본 농축물$(20\sim40%)$, 99% 이소플라본 표준품, 대두상태의 이소플라본을 대상으로 열, pH, 살균조건에 따른 안정성을 조사하였다. 대두 이소플라본 농축물은 pH 3 이하와 pH 8 이상의 pH에서 크게 감소하였으나 대두 상태의 이소플라본은 pH에 따른 이소플라본의 함량 감소가 없이 거의 일정하게 유지되었다. 99% 이소플라본 표준품은 산성 pH에서는 안정하나 알칼리에서는 대두 이소플라본 추출물보다 감소폭이 컸다. 한편 이소플라본의 열안정성은 우수하여 이소플라본은 식품의 일반적인 가공 조건에서 안정적인 것으로 나타났다.