• Nuclear Engineering and Technology
• /
• 제54권2호
• /
• pp.462-468
• /
• 2022

The selection and effective utilization of peak-fitting software for conventional gamma-ray spectrum analysis is significant for accurate determination of the mass fraction of elements, particularly in complex peak regions. Majority of the peak-fitting programs can derive similar peak characteristics for singlet peaks, but very few programs can deconvolute multi-peaks in a complex region. The deconvolution of multi-peaks requires special peak-fitting functions, such as left and right-skew distributions. In the this study, 843.76 keV (²⁷Mg) peak area from the complex region (840 keV-850 keV) determined and compared using four different peak-fitting programs, namely, GammaVision, Genie2000, HyperLab, and HyperGam. The 843.76 keV peak interfered with 841.63 keV (^152mEu) and 846.81 keV (⁵⁶Mn). The total Mg concentration was determined through k₀-instrumental neutron activation analysis by applying the isotopic interference correction factor ²⁷Al(n,p)²⁷Mg through the simultaneous determination of Al concentration. HyperLab and HyperGam peak-fitting programs reported consistent peak areas, and resultant concentrations agreed with the certified values of matrix-certified reference materials.

• 대한환경공학회지
• /
• 제33권4호
• /
• pp.275-280
• /
• 2011

고분자 응집제를 이용하여 짧은 시간에 형성된 입상형태의 슬러지를 연속회분식 장치에 주입하여 미생물의 호기성 입상화의 특성을 향상시키고, 제조한 입상화 슬러지를 하수에 적용하여 유기물제거에 대한 운전인자를 도출하였다. 유입하수 COD 63~72 mg/L에 대한 유기물 제거속도 계수 k는 $10.161d^{-1}$로 일반적 활성슬러지 공법의 k값 $5{\sim}8d^{-1}$보다 효과적으로 나타났으며, 산소이용에 대한 a', b' 값은 각각 0.87 mg $O_2/mg$ $COD_r$, 0.11 mg $O_2/mg$ MLVSS d이었다. 슬러지 합성계수와 자산 화계수는 각각 0.45 mg VSS/mg $COD_r$과 0.05 mg VSS/mg MLVSS d로 일반적 활성슬러지 공법에 비해, 자산화 계수는 비교적 적은 값으로 나타나므로 미생물의 사멸율은 낮은 것을 알 수 있었다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제20권7호
• /
• pp.1067-1075
• /
• 2007

Twenty eight 3-4 month old castrated Black Bengal kids (Capra hircus) were used to determine the effects of source and level of dietary copper (Cu) concentration on their performance and nutrient utilization. Cu was supplemented (0, 10, 20 and 30 mg/kg diet DM) as copper sulfate ($CuSO_4$, $5H_2O$) or copper proteinate (Cu-P). Kids were fed a basal diet containing maize (19.5%), soybean (17.0%), deoiled rice bran (56.5%), molasses (4.0%), di-calcium phosphate and salt (1.0% each) and mineral and vitamin mixture (0.5% each) supplements at 3.5% of body weight to meet NRC (1981) requirements for protein, energy, macro minerals and micro minerals, excluding Cu. The basal diet contained 5.7 mg Cu/kg, 122.5 mg Fe/kg, 110 mg Zn/kg, 0.26 mg Mo/kg and 0.32% S. $CuSO_4$ or Cu-P was added to the basal diet at the rate of 10, 20 and 30 mg/kg. Kids were housed in a well ventilated shed with facilities for individual feeding in aluminum plated metabolic cages. Blood samples were collected from the jugular vein on d 0, 30, 60 and 90 to determine hemoglobin (Hb), packed cell volume (PCV), total erythrocyte count (TEC), total leukocyte count (TLC) and serum enzymes (alkaline phosphatase, alanine transferase and aspertate transferase). A metabolism trial of 6 days duration was conducted after 90 days of experimental feeding. Statistical analysis revealed that source and level of Cu supplementation improved live weight gain (p<0.04) and average daily gain (p<0.01). No significant contribution of source and level of Cu to alter serum serum enzymes was evident. Goats fed Cu-P tended to have higher Hb, PCV and TEC than with $CuSO_4$ supplementation. Cu-P increased digestibility of ether extract (EE, p<0.02) and crude fiber (p<0.05) and showed an increasing trend (p<0.09) for digested crude protein (CP) and crude fiber (CF). Supplemental dose of Cu linearly improved (p<0.02) digestibilities of dry matter (DM), organic matter (OM), EE and nitrogen free extract (NFE). Though the absorption of nitrogen (N) was not affected (p>0.10) by both source and dose of Cu, N retention was affected (p<0.04) and there was a significant $Source{\times}Dose$ interaction (p<0.05). Final body weight (BW) was not influenced (p>0.10) by the source of Cu but increasing dose of Cu increased (p<0.04) the BW of kids. TDN intake (g/kg $W^{0.75}$) was higher (p<0.05) with the increased dose of Cu and there was a significant $Source{\times}Dose$ interaction. It was concluded that supplementation of Cu from different sources and varying dose level in a concentrate based diet may improve performance, nutrient utilization and plane of nutrition in castrated Black Bengal kids. The effects on performance and nutrient utilization are more pronounced with Cu-P than $CuSO_4$ supplementation. Higher dose of Cu showed better result than lower dose.

• 한국자원식물학회지
• /
• 제8권3호
• /
• pp.281-286
• /
• 1995

우리 나라에서 한양재료로 사용되고 있는 약초의 어린잎과 전초(全草)를 산채류로 이용하기 위한 기초자료를 얻기 위하여 식용이 가능한 7종의 약초 어린잎 및 전초(全草)의 일반성분, 무기성분 및 아미노산등을 분석하였다. 독활을 포함해서 7종의 약초 어린잎 및 전초(全草)의 수분함량은 $79.74{\sim}85.97%$의 범위로 다른 야채류에 비해 낮게 나타났으며, 조단백질의 함량은 당귀(1.12%)와 방풍(1.27%)을 제외하고는 대부분 2%정도로 야채류와 비슷한 경향을 보였다. 그리고 조지방은 $0.69{\sim}1.36%$, 조섬유는 $1.8{\sim}3.9%$, 조회분은 $1.58{\sim}2.79%$의 범위로로 각각 나타나 종류 별로는 다소의 차이를 보이고 있으나 일반 야채류와 대체적으로 비슷하였다. 무기성분에서는 모든 시료에서 K함량이 $202{\sim}504mg%$로 가장 높았고 Ca, Mg 및 Natns으로 나타났다. 총 아미노산의 함량은 두릅 965mg%, 황금 930mg%, 독활 879mg%, 일당귀 851mg%, 배초향가 747mg% 및 방풍 615mg%의 함량을 보였다. 아미노산의 조성을 보면 약초의 종류에 따라 아미노산의 종류별 함량 차이가 있으나 전반적으로 aspartic acid와 glutamic acid가 공통적으로 많았으며, methionine과 cystine은 모든 시료에서 가장 적게 나타났다.

• Mycobiology
• /
• 제35권4호
• /
• pp.196-204
• /
• 2007

The growth and bioconversion potential of selected strains growing on cassava waste substrate during solid state fermentation were assessed. Rhizopus stolonifer showed the highest and the fastest utilization of starch and cellulose in the cassava waste substrate. It showed 70% starch utilization and 81% cellulose utilization within eight days. The release of reducing sugars indicating the substrate saccharification or degradation potential of the organisms reached the highest value of 406.5 mg/g by R. stolonifer on cassava waste during the eighth day of fermentation. The protein content was gradually increased (89.4 mg/g) on the eighth day of fermentation in cassava waste by R. stolonifer. The cellulase and amylase activity is higher in R. stolonifer than A. niger and P. chrysosporium. The molecular mass of purified amylase and cellulase seemed to be 75 KDal, 85 KDal respectively.

• Journal of Microbiology and Biotechnology
• /
• 제21권6호
• /
• pp.652-658
• /
• 2011

The growth kinetics of Streptomyces noursei NRRL 5126 was investigated under different aeration and agitation combinations in a 5.0 l stirred tank fermenter. Poly-${\varepsilon}$-lysine biosynthesis, cell mass formation, and glycerol utilization rates were affected markedly by both aeration and agitation. An agitation speed of 300 rpm and aeration rate at 2.0 vvm supported better yields of 1,622.81 mg/l with highest specific productivity of 15 mg/l.h. Fermentation kinetics performed under different aeration and agitation conditions showed poly- ${\varepsilon}$-lysine fermentation to be a growth-associated production. A constant DO at 40% in the growth phase and 20% in the production phase increased the poly-${\varepsilon}$-lysine yield as well as cell mass to their maximum values of 1,992.35 mg/l and 20.73 g/l, respectively. The oxygen transfer rate (OTR), oxygen utilization rate (OUR), and specific oxygen uptake rates ($qO_2$) in the fermentation broth increased in the growth phase and remained unchanged in the stationary phase.

• Asian-Australasian Journal of Animal Sciences
• /
• 제10권1호
• /
• pp.15-19
• /
• 1997

An experiment was conducted to clarify the effects of dietary supplementation of monensin or salinomycin on mineral utilization of growing goats. Six goats weighing 10.54 kg initially were randomly assigned to treatments in a replicated $3{\times}3$ Latin square design. Treatments were a basal diet, basal plus 30 ppm monensin and basal plus 20 ppm salinomycin on a DM basis. The basal diet was a mixture of Italian ryegrass wafer, soybean meal, ground maize and $CaCO_3$ with DM proportions of 50, 13.76, 36 and 0.24%, respectively. Each period lasted for 21 days, and the apparent absorption and retention of minerals were measured during the last 7 days of each period. Salinomycin supplementation improved NDF digestibility and plasma glucose. The apparent absorption and retention of Ca, P, Mg, Na and K were not influenced by the treatments. The concentrations of plasma Ca, P, Mg, Na, K and Cl were similar in all treatments. The ionophore supplementation had no significant effect on acid excretion. The results suggest that 30 ppm monensin or 20 ppm salinomycin supplementation is not effective in improving the utilization of Ca, P, Mg, Na and K in growing goats fed a diet composed of the 50% concentrate.

• Bulletin of the Korean Chemical Society
• /
• 제34권8호
• /
• pp.2408-2412
• /
• 2013

We demonstrate herein the synthesis and modification of magnetic nanoparticles and its use in the immobilization of the lipase. Magnetic $Fe_3O_4$ nanoparticles (MNPs) were prepared by simple co-precipitation method in aqueous medium and then subsequently modified with tetraethyl orthosilicate (TEOS) and 3-aminopropyl triethylenesilane (APTES). Silanization magnetic nanoparticles (SMNP) and amino magnetic nanomicrosphere (AMNP) were synthesized successfully. The morphology, structure, magnetic property and chemical composition of the synthetic MNP and its derivatives were characterized using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR) analysis, X-ray diffraction, superconducting quantum interference device (SQUID) and thermogravimetric analyses (TGA). All of these three nanoparticles exhibited good crystallization performance, apparent superparamagnetism, and the saturation magnetization of MNP, SMNP, AMNP were 47.9 emu/g, 33.0 emu/g and 19.5 emu/g, respectively. The amino content was 5.66%. The AMNP was used to immobilize lipase, and the maximum adsorption capacity of the protein was 26.3 mg/g. The maximum maintained activity (88 percent) was achieved while the amount of immobilized lipase was 23.7 mg $g^{-1}$. Immobilization of enzyme on the magnetic nanoparticles can facilitate the isolation of reaction products from reaction mixture and thus lowers the cost of enzyme application.

• 한국환경과학회지
• /
• 제14권11호
• /
• pp.1057-1062
• /
• 2005

The present study investigated runoff characteristics of non-point pollutants and discharge load amount according to the land utilization in Yeinam river basin. The land utilization of target basin was divided into paddy field, dry field, forest, residential area and composition area. The study on the runoff characteristics of non-point pollutants by rainfall-runoff process showed that COD, SS and T-P had the first-flushing effect with relatively high concentration in early-stage of the rainfall-runoff process, but the T-P revealed similar runoff characteristics. Event Mean Concentration(EMC) of BOD and COD according to the land utilization revealed the range of $3.11\~15.50mg/L$ and $3.37\~33.42mg/L$, and the highest concentration of EMC corresponding to BOD and COD was detected in the paddy field. The EMC of SS showed $1.7\~305.02mg/L$ and it's highest concentration was found in the dry field. The EMC of T-N and T-P represented the highest concentration in the paddy field and dry field with range of $0.91\~8.76mg/L$ and $0.02\~0.44mg/L$.

• Applied Biological Chemistry
• /
• 제22권1호
• /
• pp.28-32
• /
• 1979

증산되고 있는 한국산 온주계통 감귤의 품질향상을 도모하여 새로운 수요를 개발하기 위한 목적의 일환으로 제주산 감귤의 품종별 가공특성 조사를 실시하였다. 1. 과실 맛의 주체라고 할 수 있는 당도는 $9.0{\sim}10.0^{\circ}Bx$였고 산도는 $1.43{\sim}l.70%$로써 당산비는 $5.3{\sim}6.6$수준으로 비교적 낮은 품질 수준을 나타냈다. 2. 감귤 통조림의 백탁 현상의 원인이라고 알려진 과육의 hespeidin 함량은 조생종에 비하여 만생종으로 갈수록 낮아져 45mg%정도였다. 3. 외피율은 만생종이 될수록 높아져서 25%정도였고 착즙율은 50%이었다. 그러므로 저장에는 만생종이 유리하며 착즙율은 품종간에 큰 차이가 없었다. 4. 착즙액의 비중은 평균 1.040정도였고 혼탁도는 만생종이 될수록 높은 흡광도를 보였다. vit. C 및 hesperidin 함량은 $25{\sim}30mg%$를 유지하였다.