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암모니아가스 처리 볏짚의 반추위내 소화과정에 대한 주사형 ( 走査型 ) 전자현미경적 연구
명규호(Kyu Ho Myung),김윤수(Yoon Soo Kim),김용식(Yong Sik Kim) 한국축산학회 1987 한국축산학회지 Vol.29 No.11
The experiment was carried out to investigate how ammoniation could affect the digestive patterns and the digestibility of rice straws using in situ technique, and scanning electron and light microscope. It was noted that ammoniation of rice straws significantly improved the digestibility at all digestion times of in situ study. The rice straws consisted of epidermis, sclerenchyma and vascular bundles with tightly packed parenchyma cells, and the stems were surrounded with intact leaf sheaths. Degradation of rice stems began with parenchyma, and proceeded to the vascular bundles and inner cuticle. Sclerenchyma and epidermis resisted degradation more than parenchyma and vascular bundles. The ammoniation during 24 hrs digestion resulted in the total degradation of parenchyma cells, Vascular bundles and inner cuticle in the ammoniated rice straws subjected to 48 hrs in situ digestion were completely digested. However, no further degradation was observed in the ammoniated stems for 72 hrs-incubation, although sclerenchyma cells were slightly broken apart into fiber cells. It is noted that ammoniated stems digested 24 hrs were much more degraded than the control samples for 72 hrs. In addition, LM observations indicated that tissues giving an acid phlorglucinol reaction for lignin appareed to totally resist attack by rumen microbes. Conculsively, ammoniation of rice straws greatly increased the amount of ground parenchyma, vascular bundles and inner cuticle digested, but had little effect on the highly lignified sclerenchyma and epidermis.
朴鍾萬,羅鎭洙,明珪鎬 全南大學校 農漁村開發硏究所 1981 農業科學技術硏究 Vol.16 No.1
The effect of three feeding levels on milk production, milk composition, body weight change, blood values and economic anaysis was studied with 3 mature, lactating, nonpregnant Holstein cows using 3×3 Latin-squares. All cows were fed grass hay and corn silage at a level of 0.7% and 3% of the body weight respectively and provided with concentrate in addition at levels to meet 100(Treatment A), 110(Treatment B) and 120%(Treatment C) of their requirements for total digestible nutrient recommended by the National Research Council in 1978. The results obtained are abstracted as follows. 1. Average daily dry matter intakes were 15.5㎏(Treatment A), 17.0㎏(Treatment B) and 18.4㎏(Treatment C) respectively. However, differences in dry matter intakes were not statistically significant. 2. Milk production averaged 15.1㎏(Treatment A), 16.1㎏(Treatment B), and 16.4㎏(Treatment C) per day respectively. Differences in-milk yields by three treatments were not statistically significant, but tened to be higher as concentrate feeding was increased. 3. There were no differences in milk fat percentages and solids-not-fat contents of the milk of the cows. 4. Body weights of all the cows were increased. However, differences in gain were not statistically significant. 5. There were no physlologically significant shifts in blood profiles of the cows. 6. Differences in ratios of milk production to feeding of the treatments were not statiostically significant, but tended to be higher as concentrate feeding was increased.
김윤수,명규호,정기철,방주원,김윤식 한국목재공학회 1986 목재공학 Vol.14 No.3
Alakline peroxide pretreatment for the delignification of poplar wood was performed, sinceit is a simple and efficent method for enhancing the enzymatic digestibility of wood residues. Approximately one-half of their lignin and most of the hemicellulose present in poplar wood were removed when the wood sawdust was reacted at 25℃ for 100 hrs in an alkaline solution (pH 11.5) of 1% peroxide. The rate of decomposition as well as the saccharification efficiency were enhanced up to 550% and 266% respectively in comparision with Chase of the controll. This enhancement is comparable with that pretreated with 1% sodium hydroxide and 20% peractaic aicd successively. The advantages of alkaline peraxide, as delignifying agents against other chemicals were also discussed.
김윤수,명규호,정기철,허정원 한국목재공학회 1987 목재공학 Vol.15 No.4
The cellulolytic activities of Aspergillus fumigatus KC-1 was investigated, which showed the mast active producer of cellulase among the 256 strains of cellulose-decomposing microorganisms screened in our laboratory. All the examined cellulolytic activities (filter paper-, Avicel-, cotton-, CMC-, salicin- and xylansaccharifying activity) in a culture of A. fumigatus KC-1 grown on 1% popular sawdust pretreated with peroxide alkaline reached a maximum within 4-5 days. The optimum pH and temperature for the enzymatic activity was found to be pH 4.5 and 60℃ respectively. The sawdust of poplar wood delignified with 1% NaOH and 20% peracetic acid succesively recorded the highest hydrolysis rate in the tests of enzymatic saccharification. The major end product of hydrolysis of poplar wood with the cellulolytic enzymes obtained from A. fumigatus KC-1 was glucose with small amount of cellobiose and xylose. It can be concluded from these results that A. fumigatus KC-1 is an advantagous source of a cellulase that is capable of hydrolyzing cellulose to glucose rapidly. The influence of degree of delignification, substrate size and its concentration on the rate of hydrolysis of poplar wood was also discussed.