• Asian-Australasian Journal of Animal Sciences
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• 제5권3호
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• pp.487-494
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• 1992

This experiment was conducted to study the effect of addition of Lucerne juice (LJ) obtained by mechanical extraction of freshly harvested crop on the nutritive value of rice straw silage. Rice straw (RS) was ensiled with intact, NaOH or $NH_3$ treated LJ at 3:7 ratio on fresh weight basis (LJ RS, LJ NaOH RS and LJ $NH_3$ RS, respectively). Each alkali was mixed with fresh juice at a level of 4% of rice straw dry matter just before ensiling. Rice straw ensiled with water was prepared as the control (W RS). In the digestion trial, goats were allocated in a $4{\times}4$ Latin-square design and fed the diet containing three parts of RS silage and one part of wheat bran (DM basis). For the goats receiving the control silage, urea was supplemented at feeding time so as to adjust the nitrogen intake except for goats on LJ $NH_3$ RS silage. Crude protein content of RS silage was increased from 5.2 to 9.1% (DM basis) by the addition of intact LJ and to about 24% by $NH_3$ treated LJ. The control W RS silage contained only trace amount of lactic acid and was dominated by acetic and butyric acid. The addition of intact LJ reduced butyric acid content and $NH_3-N/TN$ of the silage whereas the addition of alkalized LJ increased those values and shifted to a butyrate type fermentation. Nutrient digestibilities and nitrogen balance of goats were almost the same when they were fed W RS and LJ RS silage indicating the addition of intact LJ did not improve the nutritive value. The addition of alkalized LJ significantly increased the fiber digestibilities of RS silage and $NH_3$ treatment was more effective than NaOH treatment. Postprandial ruminal $NH_3-N$ and blood urea nitrogen (BUN) concentrations were decreased by feeding LJ NaOH RS silage suggesting ruminal protein synthesis was enhanced along with the increase of energy supply for supply for rumen microbes by the alkali treatment. The advantageous fiber digestibilities of LJ $NH_3$ RS silage compared with those of LJ NaOH RS silage might be attributable to a sufficient nitrogen supply for microbial fiber digestion in the rumen.

• Asian-Australasian Journal of Animal Sciences
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• 제12권3호
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• pp.358-365
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• 1999

The effects of dry roasting whole lupin seeds (lupinus albus, WLS) at 110, 130 or $150{^{\circ}C}$ for 15, 30 or 45 minutes on the in sacco rumen degradation characteristics, optimal heating conditions of time and temperature and in vitro enzyme digestibility were determined. Ruminant degradation characteristics (RDC) of crude protein (CP) of WLS were determined by in sacco technique in dairy cows. Measure ROC were soluble (S), undegradable (U), potentially degradable (D) fractions, lag time (TO) and rate of degradation (Kd) of insoluble but degradable fraction. Based on measured ROC, percentage bypass CP (%BCP) and bypass CP (BCP in g/kg, DM) were calculated. Degradability of CP was significantly reduced by dry roasting (p<0.001). The interaction of dry roasting temperature and time had significant effects on D (p<0.05), Kd (p<0.01), U (p<0.01), %BCP (p<0.001) and BCP (p<0.001) but not on S (p=0.923>0.05). With increasing time and temperature, S, D, Kd and U varied from 31.8%, 67.4%, 10.3%/h and 0.8% in the raw WLS (RWLS) to 27.1 %, 35.8%, 3.6%/h, 38.4% in $150{^{\circ}C}/45\;min$, respectively. All these effects resulted in increasing %BCP from 25.9 in RWLS to 61.0% in the $150{^{\circ}C}/45\;min$. Therefore BCP increased form 111.2 to 261.2 g/kg DM, respectively. Both %BCP and BCP at $150{^{\circ}C}/45\;min$ increased nearly 2.5 times over the RWLS. The effects of dry roasting on %BCP and BCP seemed to be linear up to the highest value tested. Although ROC had been altered by dry roasting, the In vitro perpsin-cellulase digestibility was generally unchanged. It was concluded that dry roasting was effective in shifting CP degradation from rumen to the lower gastrointestinal tract to potential reduce unnecessary N loss in the rumen. It might be of great value in successfully synchronizing the rhythms of release of nitrogen and energy in the rumen, thus achieving a more efficient fermentation of diets with high proportions of lignocellulosic resources. To determine the optimal dry roasting conditions, the digestibility of each treatment in the cows will be measured in the next trial using mobile bags technique.

• 청정기술
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• 제21권3호
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• pp.164-170
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• 2015

본 연구에서는 polysulfone과 Escherichia coli biomass의 현탁액을 방사하여 입상화한 PS-E. coli biomass composite fiber (PSBF)와 PSBF에 존재하는 아민기를 메틸화시킨 amine-methylated PSBF (AM-PSBF)를 제조하였다. PSBF와 AM-PSBF에 의한 염기성 염료 Basic Blue 3 (BB3)의 흡착특성을 비교함으로써 아민기의 메틸화가 BB3의 흡착에 미치는 영향을 확인하였다. pH edge 실험에서는 두 흡착제 모두 pH가 증가할수록 BB3 흡착량이 증가하는 경향을 보였고, 동일 pH에서 AM-PSBF가 PSBF보다 높은 흡착량을 나타내었다. PSBF와 AM-PSBF 모두 흡착평형은 5시간 이내에 도달하였으며, 흡착속도론 실험 데이터는 유사 1차 속도 모델식으로 잘 묘사되었다. 그리고 Langmuir 모델에 따르면, pH 8에서 AM-PSBF의 최대흡착량은 28.9 mg/g로 PSBF의 최대흡착량인 20.7 mg/g보다 약 1.4배 증가하였다. 이 결과로부터 PSBF에서 아민기의 메틸화는 염기성 염료의 흡착을 향상시키는 효과가 있음을 알 수 있다. 또한, 탈착실험 결과는 AM-PSBF가 반복적으로 재사용 될 수 있음을 보여주었다.

• Fisheries and Aquatic Sciences
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• 제23권1호
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• pp.2.1-2.6
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• 2020

Background: As the cost of fishmeal continues to rise, there will be a need to optimize the diet by minimizing dietary fishmeal inclusion in aquafeed. In this study, a 7-week experiment was conducted to evaluate soybean meal, fermented soybean meal (soytide), and sesame meal as fishmeal replacers in whiteleg shrimp, Litopenaeus vannamei. Methods: A 30%-based fishmeal diet was considered as control (CON), six other diets were prepared by replacing 20% or 40% of fishmeal with soybean meal (SB₂₀ and SB₄₀), fermented soybean meal (ST₂₀ and ST₄₀), or sesame meal (SM₂₀ and SM₄₀) from the CON diet. Twenty shrimp with average initial weight of 0.65 ± 0.05 g (mean ± SD) were randomly distributed into 21 tanks (45 L) and fed four times a day. Water temperature was controlled at 28 ± 1 ℃ and aeration was provided by air stones. Results: Weight gain, specific growth rate, feed efficiency, and protein efficiency ratio of shrimp fed CON showed no significant differences compared to shrimp fed all the other diets. However, growth performance of shrimp fed ST₂₀ diet was significantly higher than those of shrimp fed the SM₂₀ and SM₄₀ diets (P < 0.05). Superoxide dismutase activity (SOD) of shrimp fed CON, ST₂₀, and ST₄₀ diets was significantly higher than those of shrimp fed the SB₄₀ and SM₄₀ diets. But there were no significant differences among shrimp fed CON, SB₂₀, ST₂₀, ST₄₀, and SM₂₀ diets. Also, lysozyme activity of shrimp fed ST₂₀ diet was significantly higher than those of shrimp fed the SB₄₀ and SM₄₀ diets. Although, lysozyme activity of shrimp fed the CON diet was not significantly different compared to shrimp fed all the other experimental diets. Conclusions: Therefore, SB, ST, and SM could replace 40% of fishmeal based on growth performance and lysozyme. According to the SOD activity, SB and SM could replace 20% of fishmeal and ST could replace 40% of fishmeal in juvenile whiteleg shrimp Litopenaeus vannamei.

• 한국근적외분광분석학회:학술대회논문집
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• 한국근적외분광분석학회 2001년도 NIR-2001
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• pp.1257-1257
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• 2001

Fourier transform near infrared (FT-NIR) spectroscopy was used as a rapid method to measure the $^{o}Brix$ content and to discriminate between different must samples in terms of their fee amino nitrogen (FAN) values. FT-NIR spectroscopy was also used as a rapid method to discriminate between Chardonnay wine samples in terms of the status of the male-lactic fermentation (MLF). This was done by monitoring the conversion of malic to lactic acid and thereby determining whether MLF has started, is underway or has been completed followed by classification of the samples. Furthermore, FT-NIR spectroscopy was applied as a rapid method to discriminate between table wine samples in terms of the ethyl carbamate (EC) content. EC in wine can pose a health threat and need to be monitored by determining the EC content in relation to the regulatory limits set by the authorities. For each of the above mentioned parameters, $QUANT+^{TM}$ methods were built and calibrations derived and it was found that a very strong correlation existed in the sample set for the FT-NIR spectroscopic predictions of $^{o}Brix$ (r = 0.99, SECV = 0.306), but the correlations for the FAN (r = 0.61, SECV = 272.1), malic acid (r = 0.58, SECV = 1.06), lactic acid (r = 0.51, SECV = 1.14) and EC predictions (r = 0.47, SECV = 3.67) were not as good. Soft Independent Modeling by Class Analogy (SIMCA) diagnostics and validation was applied as a sophisticated discrimination method. The must samples could be classified in terms of their FAN values when SIMCA was applied, obtaining results with recognition rates exceeding 80%. When SIMCA diagnostics and validation were applied to determine the progress of conversion of malic to lactic acid and the EC content, again results with recognition rates exceeding 80% were obtained. The evaluation of the applicability of FT-NIR spectroscopy measurement of FAN, $^{o}Brix$ values, malic acid, lactic acid and EC content in must and wine shows considerable promise. FT-NIR spectroscopy has the potential to reduce the analytical times considerably in a range of measurements commonly used during the wine making process. Where conventional FT-NIR calibrations are not effective, SIMCA methods can be used as a discriminative method for rapid classification of samples. SIMCA can replace expensive, time-consuming, quantitative analytical methods, if not completely, at least to some extent, because in many processes it is only needed to know whether a specific cut off point has been reach or not or whether a sample belongs to a certain class or not.

• Asian-Australasian Journal of Animal Sciences
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• 제23권12호
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• pp.1657-1667
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• 2010

Direct-fed microbials (DFM) are dietary supplements that inhibit gastrointestinal infection and provide optimally regulated microbial environments in the digestive tract. As the use of antibiotics in ruminant feeds has been banned, DFM have been emphasized as antimicrobial replacements. Microorganisms that are used in DFM for ruminants may be classified as lactic acid producing bacteria (LAB), lactic acid utilizing bacteria (LUB), or other microorganisms including species of Lactobacillus, Bifidobacterium, Enterococcus, Streptococcus, Bacillus and Propionibacterium, strains of Megasphaera elsdenii and Prevotella bryantii and yeast products containing Saccharomyces and Aspergillus. LAB may have beneficial effects in the intestinal tract and rumen. Both LAB and LUB potentially moderate rumen conditions and improve feed efficiency. Yeast DFM may reduce harmful oxygen, prevent excess lactate production, increase feed digestibility, and improve fermentation in the rumen. DFM may also compete with and inhibit the growth of pathogens, stimulate immune function, and modulate microbial balance in the gastrointestinal tract. LAB may regulate the incidence of diarrhea, and improve weight gain and feed efficiency. LUB improved weight gain in calves. DFM has been reported to improve dry matter intake, milk yield, fat corrected milk yield and milk fat content in mature animals. However, contradictory reports about the effects of DFM, dosages, feeding times and frequencies, strains of DFM, and effects on different animal conditions are available. Cultivation and preparation of ready-to-use strict anaerobes as DFM may be cost-prohibitive, and dosing methods, such as drenching, that are required for anaerobic DFM are unlikely to be acceptable as general on-farm practice. Aero-tolerant rumen microorganisms are limited to only few species, although the potential isolation and utilization of aero-tolerant ruminal strains as DFM has been reported. Spore forming bacteria are characterized by convenience of preparation and effectiveness of DFM delivery to target organs and therefore have been proposed as DFM strains. Recent studies have supported the positive effects of DFM on ruminant performance.

• Asian-Australasian Journal of Animal Sciences
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• 제14권12호
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• pp.1701-1704
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• 2001

The evaluation of structural carbohydrate losses and its effect on silages digestibility in alfalfa (Medicago sativa L.) and orchardgrass (Dactylis glomerata L.) was studied during 5, 21 and 56 days ensiling. About 70 and 60 kg fresh matter of the two forages were ensiled in 9 silos of 120 L capacity. The digestion trials were conducted in two phases using the two grasses in two $4{\times}4$ Latin square design according to the four treatments being the grass and the three silages. There were no differences in the DM and CP contents resulting from 5 to 56 days ensiling in both forages. The water-soluble carbohydrates (WSC), hemicelllose, pectin, and energy were slightly reduced and appeared lower in 56 days silage. The ether extract and cellulose contents slightly increased as the ensiling process advanced in the two species. Hemicellulose losses of 29 and 41 g/kg DM were obtained in alfalfa and orchardgrass, respectively, 56 days after ensiling. While the cellulose losses in both species were very little, compared to that for hemicellulose, the pectin losses, 56 days after ensiling were 15 and 12 g/kg DM in alfalfa and orchardgras respectively. The total structural carbohydrates lost (ie., hemicellulose + cellulose + pectin) in g/kg DM of fresh material forage ensiled, is about four fifths the amount lost by WSC, in alfalfa and about two thirds, in orchardgrass, by 21 days ensiling after the activity of microorganism terminated, indicating that appreciable amount was used as substrate for silage fermentation. Ensiling alfalfa and orchardgrass for 0, 5, 21 and 56 days maintained a decreasing trend of 83.8, 82.5, 79.3 and 78.9% digestibility in alfalfa and 80.5, 77.0, 77.1 and 76.4% digestibility in orchardgrass. While the digestibility of cellulose and ether extract increased in silage in both species, the digestible energy values in silage were reduced from 2.6 to 2.3 and 2.9 to 2.7 Mcal/kg DM respectively in alfalfa and orchard during 5-56 days ensiling.

• 한국식품영양과학회지
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• 제21권1호
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• pp.54-59
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• 1992

Lactobacillus acidophilus를 이용한 배추김치 제조 연구의 일환으로 이 균이 생성하는, 김치의 연화와 밀접한 관련이 있는 효소의 하나인 ${\beta}-galactosidase\;({\beta}-Galase)$의 성질을 균체내외 효소로 구분하여 조사하였다. Gel여과법에 의하여 측정한 균체내외 ${\beta}-Galase$의 개략적인 분자량은 각각 550,000 및 740,000 dalton이었으며 $K_{m}$값은 각각 1.67mg/ml 및 1.33mg/ml $V_{max}$은 각각 $8.5{\mu}mol/mg/30min$ 및 $2.65{\mu}\;mol/ml/30min$이었다. 최적 pH는 균체내 효소의 경우는 7, 균체외 효소는 8이었으며 최적온도는 다같이 $30^{\circ}C$ 최적 소금농도는 $4{\sim}5%$이었다. ${\beta}-Galase$의 열에 대한 안정성은 $60^{\circ}C$에서 $90^{\circ}C$로 온도가 높아질수록 그리고 열처리 시간이 길어질수록 감소하였는데 최초 열처리 2분간의 감소율이 가장 높았다.

• 한국작물학회지
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• 제67권4호
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• pp.305-318
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• 2022

본 총설은 인삼과 도라지의 노화와 관련된 건강효과에 대하여 주요 기능성물질의 약리적, 약동학적 효과에 대한 연구들을 조사하여 과학적 근거를 정리하였다. 도라지와 인삼의 주요 기능성물질은 사포닌이므로 유사한 분자구조로 공통적으로 항염증 및 항산화 효과, 신경 보호효과와 항암작용, 항대사증후군 효과(고혈압, 이상지질혈증, 당뇨, 비만의 개선)가 확인되었다. 도라지의 사포닌은 Platycodin으로 기관지에 관련한 효능이 주가 되었지만 그 외에도 사포닌이 가진 공통적인 건강에 긍정적인 효과에 대해서 검증이 되어 있었다. 도라지의 효능에 대한 연구는 주로 실험실 연구나 동물 실험이 많았고 사람에게 적용한 임상연구는 적은 편이었다. 한편 인삼의 사포닌은 Ginsenoside로 사포닌의 효능으로 잘 알려진 항염증, 항산화, 항암, 항대사증후군에 대한 효능에 대하여 많은 임상연구를 통하여 그 효능이 검증되어 있었다. 인삼과 도라지의 두 종류의 사포닌 모두 정제된 자체로는 체내 흡수율이 매우 낮았지만 추출이나 발효 등의 방법을 통하여 체내흡수율을 높이는 방법들이 연구되어 있었다.

• 미생물학회지
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• 제49권2호
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• pp.200-204
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• 2013

생전분으로부터 에탄올을 효율적으로 생산하는 전분 분해성 산업용 Saccharomyces cerevisiae를 제조하기 위해 생전분을 발효하는 모균주(ATCC 9763/$YIp{\delta}AGSA{\delta}$)의 염색체내 ribosomal DNA loci에 double 18S rDNA-integration 시스템을 이용하여 Bacillus amyloliquefaciens ${\alpha}$-amylase 유전자(Amy) 혹은 Aspergillus awamori glucoamylase 유전자(GA1)를 다중도입시켰다. 얻어진 형질전환 균주들 중 생전분으로부터 가장 효율적으로 에탄올을 생산하는 균주(ATCC 9763/$YIp{\delta}AGSA{\delta}$/YIpAG2rD)의 발효 3일째 에탄올 생산은 모균주에 비해 1.5배 높았다. 이 새로운 균주는 생옥수수 전분이 20% (w/v) 함유된 배지에서 3일간 발효를 통해 에탄올 9.2% (v/v) (72 g/L)를 생산하였고, 생전분 함유량의 75%를 소비하였다.