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蛋白質 수준이 다른 食餌의 交替給食이 成長期別 營養에 미치는 影響
黃致燁,朱軫淳 고려대학교 의과대학 1972 고려대 의대 잡지 Vol.9 No.1
This study was devised to observe the effects of different dietary levels of protein upon the nutritional state of rat, by changing the feeding periods of respective diets or by alternsting the diets. Just weaned 108 male albino rats were used for the experiment. The rats were subjected to 3 different dietary levels of low, standard and high protein, and each treatment going through 1, 2, 3, or 6 months feeding, a total of 12 different experimental groups (SD₁, SD₂, SD₃, SD_(6), LP₁, LP₂, Lp₃, LP_(6), HP₁, HP₂, HP₃, HP_(6)). There are 6 more groups and these include alternate feeding of low protein for 1 or 2 months followed by high protein of 1 or 2 months feeding and vice versa (LP₁HP₁, HP₁LP₁, LP₁HP₂, LP₂ HP₁, HP₁LP₂, HP₂LP₁). The body wieght gain and the amounts of total nitrogen, lipids and chloesterol retained in the liver, kidney, brain and muscle of the rat were determined. The results obtained are summarized as follows; 1) For the groups of low dietary protein, the rats weighed less than that of standard dietary protein group. However, little difference in weight gain was abserved between the groups of standard and high dietary protein. This was also true between the group of alternate feeding the high protein followed by the low and the standard group. On the contrary, alternating the feeding of low protein with high resulted in less weight gain compared to that of standard group and the results were very much alike with that of feeding the low protein alone. 2. a) The nitrogen content in the liver is less for the low protein diet group. For the group receiving high dietary protein, the amount retained in the tissue was higher than that of the standard diet group for the first one month down to the level of standard diet group afterward. b) In the early stage of growth, there is less change in the nitrogen content in the liver of high protein diet group than that of the low protein diet proup. And those in the kidney and muscle is not greatly affected by dietary condition. 3. The total cholesterol content in the liver is generally higher in the low protein diet group than that in the high protein diet group. In the view of the above results, it can be seen that the dieary conditions in the early stage of growth has an influence on the nutritional state in the later stage of growth.
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食餌性 蛋白質이 臟器內 G.P.T. 및 G.O.T. 活性에 미치는 影響
吳承浩,黃致燁,李萬祚,柳五龍 中央醫學社 1971 中央醫學 Vol.21 No.2
This study was designed to observe the change of G.P.T. and G.O.T. activities in organs according to the lapse of time after taking some diets. The subjects were 54 pure male albino rats weighing 270-280g. They were divided into the standard diet group, the high protein diet group and the high carbohydrate diet group, and were re divided into 1 hour group, 3 hours group and 6 hours group, according to the lapse of time after taking some diets. Each animal was sacrificed on the corresponding day, and G.P.T. and G.O.T. activities in the liver,. kidney and serum were determined. The results were summarized as follows: 1. The G.P.T. activity in the liver changed markedly when 1 and 3 hours passed since taking some diets. 2. The G. O. T activity in the liver was higher in the standard diet group than in the high protein diet group and the high carbohydrate diet group, in all periods after taking some diets. 3. The G.P.T. activity in the kidney was greatly lower in the lapse of 6 hours than in the lapse of 1 hour. 4. The G.P.T. and G.O.T. activities in the serum showed no great change.
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Continuous Synthesis of Monodisperse Spherical Silica Powder Using Tubular Reaction System
조영상,황치엽,김성준,박우현 대한금속·재료학회 2022 대한금속·재료학회지 Vol.60 No.6
In the present study, monodisperse silica nanospheres were synthesized using a tubular reaction system in a continuous way. Screw-type blades were inserted inside a T-mixer for static mixing of the reactant streams which consisted of TEOS and NH4OH/H2O diluted with ethanol, for the continuous synthesis of the silica suspension. The diameter of the silica powder was monitored as a function of production time using dynamic light scattering to determine the optimum retention time and tube length, which were found to be 125 minutes and 7.5 m, respectively. The effects of reactant compositions on particle size were investigated by adjusting the amount of ammonia and water in the sol-gel reaction, which were then compared with the results from a batch reactor. Both the particle size and polydispersity index (PDI) of the silica suspension were measured to be comparable to nanospheres synthesized using a batch reactor. This implies that the tubular reaction system is more beneficial for potential industrial production applications in the size range from 115 to 310 nm, due to its continuous powder synthesis. The effect of the reaction medium was also studied, by replacing ethanol with methanol or propanol, indicating that the deviation in particle size with production time was not a serious issue in alcohols with lower molecular weight, such as methanol and ethanol.
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