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乳保存劑로서 過酸化水素의 添加가 醱酵乳製造에 미치는 影響
宋鎭吉 건국대학교 1978 論文集 Vol.8 No.1
This report described the effect of hydrogen peroxide on the yoghurt of cultured milk as the raw milk was added to it on the farm or in dairy plants and factories. The results obtained are as follows : 1. Not more than 0.01% adding of hydrogen peroxide by weight of the milk did not form any defects of yoghurt. 2. The milk to be treated with hydrogen peroxide not to exceed 0.01% was not indicated by potassium iodide solution (25%) after pasteurization at 90 C for 30 minutes. 3. Use of too much hydrogen peroxide (to exceed 0.03% by weight of the milk) led to undesirable defects of flavor, tastes and did not coagulate the milk in 14 hours. 4. Total facteriol count number of yoghurt to be added hydrogen peroxide was reduced compared with the control.
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호평벼와 남평벼의 혼합재배에 의한 도열병 방제와 레이스 다양성의 변화
오인석,민지영,조명길,노재환,신동범,송진,김명기,조영찬,김병련,한성숙 한국식물병리학회 2008 식물병연구 Vol.14 No.3
Mixed-planting of two rice cultivars, HP (‘Hopyeongbyeo’) and NP (‘Nampyeongbyeo’), having a dissimilar susceptibility to rice blast was practiced for chemical-free control of rice blast in the field. The HP/NP combination was selected for applying under mechanized agricultural conditions. Because they have similar genetic characteristics such as seed germination and heading time, culm length, rice quality and size of rice grains except susceptibility to blast. Incidence of panicle blast was reduced 50.4% compare with supposed blast incidence by HP/NP mixed-planting when the seeds of two cultivars were combined 1 to 1 as weight. Supposed blast incidence was estimated from reduction of rice blast caused by addition of a resistant cultivar NP. Race diversity of Magnaporthe oryzae was examined for correlation with control effect of HP/NP mixed-planting on rice blast. The population of dominant race KJ-101 was diminished and replaced with various co-existing races and eleven new races were appeared in mixed-planting plot. Total number of race isolated from mixedplanting plot was not largely different from mono-culture. However, detection frequency of the new race was increased and variation of the population size of each race was decreased in mixed-planting plots. It was shown that a biased community with a dominant race (KJ-101 or KI-181) was altered to a balanced one of coexisting races. From these results, it was supposed that the balanced diversity among co-existing races within a community might be correlated to control effect by HP/NP mixed-planting on rice blast. Further more, it should be studied that genetic characteristics of the individual race including a virulence on cv. HP and NP was examined for verifying a correlation of mixed-planting effect and race diversity. Mixed-planting of two rice cultivars, HP (‘Hopyeongbyeo’) and NP (‘Nampyeongbyeo’), having a dissimilar susceptibility to rice blast was practiced for chemical-free control of rice blast in the field. The HP/NP combination was selected for applying under mechanized agricultural conditions. Because they have similar genetic characteristics such as seed germination and heading time, culm length, rice quality and size of rice grains except susceptibility to blast. Incidence of panicle blast was reduced 50.4% compare with supposed blast incidence by HP/NP mixed-planting when the seeds of two cultivars were combined 1 to 1 as weight. Supposed blast incidence was estimated from reduction of rice blast caused by addition of a resistant cultivar NP. Race diversity of Magnaporthe oryzae was examined for correlation with control effect of HP/NP mixed-planting on rice blast. The population of dominant race KJ-101 was diminished and replaced with various co-existing races and eleven new races were appeared in mixed-planting plot. Total number of race isolated from mixedplanting plot was not largely different from mono-culture. However, detection frequency of the new race was increased and variation of the population size of each race was decreased in mixed-planting plots. It was shown that a biased community with a dominant race (KJ-101 or KI-181) was altered to a balanced one of coexisting races. From these results, it was supposed that the balanced diversity among co-existing races within a community might be correlated to control effect by HP/NP mixed-planting on rice blast. Further more, it should be studied that genetic characteristics of the individual race including a virulence on cv. HP and NP was examined for verifying a correlation of mixed-planting effect and race diversity.
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