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양한섭,변대석,노락현,성대환 한국수산학회 1981 한국수산과학회지 Vol.14 No.3
Discoloration of canned boiled oysters during storage is one of the serious problems which affect the quality of the products as well as the untritive value. Usually the factors influencing the quality of canned boiled oysters are the process of pretreatments and the storage temperature of the products. In the present work, the changes of the total chlorophylls and carotenoids in the meat and the viscera of oysters were determined in order to make certain the procedure of the discolaration. In addition, the amino-N and the available lysine as factors of the nutritive value were also checked. Inn case of treatment with additives, direct addition of syrups containing additives just before seaming or soaking boiled oysters into the solution of additives seemed to have mild effects on retardation of discoloration. The migration of carotenoids from the viscera into the meat was faster than that of chlorophyll resulting in yellowing of the products preceded greening caused by the chlorophylls. Treatment with 0.5% Na_2EDTA of 2.5% brine retarded discoloration and available lysine loss of the products while sodium-polyphosphate accelerated them. It was probably due to that sodium-polyphosphate could affect the softening or breakdown of the muscle of oysters. But most of all, storage temperature of canned boiled oysters seemed to be the major factor influencing the discoloration and nutritive loss of the products.
양한섭,김성수 한국수산학회 1991 한국수산과학회지 Vol.24 No.3
여름철 한국 남해 50m 이심층에 나타나는 각종 수괴들의 물리·화학적 특성과 이들 수괴의 분포에 대해 연구하였다. 그 결과를 요약하면, 濟州島를 중심으로 북서쪽해역 중·저층에는 비교적 영양염이 풍부하고, 수온 12℃이하의 黃海底層冷水系의 해수가 넓게 분포하고 있다. 또한, 남동쪽 해역에서는 수온 16℃ 이상이고, 염분 34.0‰ 이상인 對馬暖流水가 50m 수층에서 제주도 연안 약 15㎞까지 나타난다. 그러나, 남서쪽 외해역에서는 13℃ 이하의 黃海底層冷水 기원의 해수가 분포하고 있으나, 북서쪽 해역에 비해 그 면적도 좁고, 질산염 농도도 현저히 낮다. 이처럼 질산염 농도가 낮은 이유는 남서쪽 외해역까지 남하한 黃海底層冷水가 북상하는 對馬暖流水와 마주치면서 질산염이 거의 고갈된 표층의 해수와 수직혼합이 잘 이루어졌기때문이라고 판단된다. 한편, 제수도 남쪽해역에서 수층별 수온의 수평분포로부터 黃海底層冷水와 對馬暖流水의 주류는 각각 50m 수층과 그 상부수층으로 유입되는 반면, 수온이 13∼15℃로서 위 두수괴의 혼합수인 黃海暖流水는 주로 75m 이심층에서 보다 넓게 분포하고, 제주도 연안해역에서는 50m 수층에도 黃海暖流水가 존재함을 알 수 있다. 즉. 이들 각 수괴의 분포는 해역별 또는 수심에 따라 다르며, 각 수괴의 영양염 농도는 수층별 해수체류시간의 차이보다는 물리적 혼합의 세기에 의해 결정되는 것 같다. 그리고, ΔSi/ΔP비로 볼 때 남쪽해역 중·저층에 존재하는 해수는 동해 표·중층수 보다 횔씬 젊다고 생각된다. We have investigated geographical distribution and physico-chemical properties of water masses or water types at mid-bottom depth in the neighbouring sea of Cheju Island in August 1986. In 50m layer the Yellow Sea Bottom Cold Water(YSBCW) below 12℃ was observed in the northwestern area of Cheju Island, while the Tsushima Warm Water(TWW) with relatively high temperature($gt;16℃) and salinity more than 34.0‰ in its southeastern area extended as far as the coast of about 15㎞. Also, 50m layer at the outside stations of its southwestern area indicated relatively cold water temperature(11∼13℃), probably due to southward transport of the Yellow Sea Bottom Cold Water(YSBCW). The Yellow Sea Warm Water(YSWW), the mixed water of the YSBCW and the TWW, ranged 13℃ to 16℃ in water temperature and was appeared mainly in the coastal and intermediate area of Cheju Island. And the relatively cold water in the southwestern area and the Tsushima Warm Water were more extensively distributed in 50 m layer than the deeper layer. Horizontal distributions of nitrate and phosphate showed a pattern similar to that of water temperature. As it were, the Yellow Sea Bottom Cold Water had the highest concentration of nutrients, while southwestern outside stations had the lowest nutrient contents. Especially, the concentration of nitrate in the latter was remarkably low compared with the value at the other stations. It may be attributed to intensive vertical mixing by collision of the northward driven TWW with the southward driven YSBCW. Also, it was particular that the Tsushima Warm Water indicated relatively high silicate content corresponding to that of the Yellow Sea Bottom Cold Water. Based on the data of ΔSi/ΔP ratio, it seems that the mid-bottom waters in this study area are younger than the surface or intermediate water in the Korean East Sea.