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      • KCI우수등재

        산성환경에서 Lactobacillus casei YIT9018 의 생존에 관한 연구

        김현욱,유광현,이돈성,고준수 ( Hyun Uk Kim,Kwang Hyun You,Don Sung Lee,Jun Soo Goh ) 한국축산학회 1980 한국축산학회지 Vol.22 No.4

        Behavior of Lactobacillus casei YIT9018 has been studied in acidic media !MRS and skim milk broth) using three most common acids (acetic, lactic, citric acid) for their survival and the factors affecting their acid tolerance. Survival and death of L. casei YIT9018 were dependent on the concentration and the kinds of acids present in the media. In MRS broth, about 120 mM of lactic acid appeared to be the critical acid concentration for the survival of this useful lactic acid bacterial species. At the same molar concentration of the acids studied, citric acid was the most inhibitory, lactic acid is the next, and acetic acid was the least inhibitory acid to the survival of L. casei YIT9018 in MRS broth. Chemical structure of the acids and pH of acidified media appeared to affect the growth and the survival of this bacterium. Peptone, sucrose, and skim milk powder demonstrated varying degree of the protection for the survival of L.casei YIT9018 in acidified MRS broth. Skim milk was the most protective, peptone was the next, and sucrose was the least protective additive. Synergistic effects were observed when mixtures of acids were used in acidifying the media. Mixture of lactic and citric acid was the most inhibitory and the synergistic inhibition was stronger in MRS broth than in skim milk broth.

      • KCI우수등재

        이년계 ( 二年鷄 )에 있어서 각종 Hormone 및 임부요 ( 姙婦尿 )의 처리가 산란 및 육생산에 미치는 영향에 관한 연구

        김선균,이기동,이돈성 ( S . K . Kim,K . D . Lee,D . S . Lee ) 한국축산학회 1979 한국축산학회지 Vol.21 No.4

        This experiment was conducted to investigate the effects of treatment of various hormonal substance upon the egg laying, meat production and meat quality of two-year-old hens. 1. Effect of various hormone substances treatment on egg laying. 1) The rate of laying was significantly changed by the administration of various hormone substances ( P$lt;0.05) The laying rate of pregnant women`s urine and PM S treated group, but that of progesterone, thyroxine and Tapazol treated-group was decreased compared to the control group. 2) No significant difference in the egg weight among each treated groups was recognized. 3) S tuck on ovary 1㎝ in diameter, changed propotionally with the rate of laying and a significant difference among treated groups was recognized. 2. Effect of various gormone substances treatment on meat production and quality. 1) A significant change of body weight according to dosing with various hormone substances amonagn comparison groups, is recognised from 10 weeks after treatment, but only troxine treated group lose weight and are inferior, whereas other groups are heavier, compared with the control group, but its variation is very little. 2) A significant difference (p$lt;0.05) in carcass weight among the treated groups was recognized and the carcass weight of 5 treated-groups except thyroxin and progesterone treated-group was significantly higher than that of the control group. 3) The carcass percentage of PMS and Tapazol treated-group was significantly higher than that of the control group and there are no significant differences between the other groups and control group. 4) There was little difference of water extractives and ash content in meat component of 8 treated-groups. The crude protein of meat. was decreased a little in thyroxine and Tapazol treated-group while that of meat in estrogen, PMS and progesterone treated-group was increased a little. The crude fat contant was particularly increased in Tapazol treated-group and in the other groups it was similar to that of the control group. 3. Effect of various hormone substances treatment on the each organs. 1) A significant difference (p (0.05) in the total weigh of internal organs treated-groups was recognized. The total weight of internal organs in Tapazol and PMS treated-groups was heavier than in the control group. It is remarkably light in thyroxine treated groups. 2) There were some differences among the weight of gizzard fat and small intestine in 8 treated groups, but the changes in various organs weights were comparatively similar to those in total weight of internal organs. 3) The weight of liver, heart, pancreas and gizzard appeared generally to be in proportion to the body weight. 4) The weight of content was increased remarkably in estrogen treated-group and decreased in progesterone groups. A significant difference (p$lt;0.0.5) among the treated-groups was recognized. 5) A significant difference (p$lt;0.05) in the weight of a reproductive duct among treated-groups was recognized. The weight decreases remarkably in progesterone and Tapazol treated-groups and in the other groups it is little different from in the control group and generally tends to vary as an laying rate.

      • KCI등재후보

        몇 가지 갑상선 질환에 있어서의 위산도

        조방환 ( B. H. Cho ),이영선 ( Y. S. Lee ),이돈성 ( D. S. Lee ),김학열 ( H. Y. Kim ),이상종 ( S. J. Lee ) 대한내과학회 1970 대한내과학회지 Vol.13 No.6

        Disturbances of gastric secretion as related to thyroidal gland dysfunction have been noted for many years. In both old and recent literature one finds conflicting statements regarding the gastric contents in thyroidal diseases. King stated that in exophth

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