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이상호(S . H . Lee),전우민(W . M . Jeon),김영교(Y . K . Kim),이상업(S . U . Lee),정순영(S . Y . Jeong) 한국축산학회 1991 한국축산학회지 Vol.33 No.5
Major milk proteins were analysed using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and two demensional (2-D) gel electrophoresis combined with isoelectic focusing(IEF). α_s- and β-caseins were recognized in acid-precipitable fractions of both Holstein (HOL) and Korean Native cattle (KNC) milk as indicated with commercial preparation of bovine caseins. κ-Casein was further identified with a positive staining of periodic acid Schiffs (PAS) reagents and disappearance of the protein after rennin treatment. Both commercial α_s-, β-and κ-casein, and our casein preparations gave albumin and β-lactoglobulin bands in the SDS-PAGE. Other unknown minor components were also found in both HOL and KNC. In 2-D analysis albumin was separated into two different spots, and β-lactoglobulin was also separated into two genetic variants, A and B. Casein complexes are highly complicated with their heterogeneity. KNC appeared to have more proteins thus sho-wing different peptide patterns. The results suggest that SDS-PAGE and 2-D gel electrophoresis would be useful to analyse the major milk proteins and are applicable to various analytical purposes.
스퍼터링압력 및 온도 효과에 의한 Co(2Å) / Pd(13Å) 다층박막의 자화반전 거동
김성봉(S. B. Kim),정순영(S. Y. Jeong) 한국자기학회 1996 韓國磁氣學會誌 Vol.6 No.4
To study the magnetization reversal behavior of Co/Pd multilayers, we first demagnetized the samples by the field-demagnetized method and then measured initial curves and minor loops. The coercivity and the perpendicular magnetic anisotropy were obtained from the perpendicular and parallel magnetization curves measured at different temperatures. We interpret our experimental results by applying several qualitative and semiquantative approaches. From these study, we found that the magnetization reversal behavior is dominated by the domain wall pinning for all samples and the coercivity incremental tendency can be explained by Kronmuller's formula Hc(T) ∝ r。ㆍKu.