Objective : To evaluate the color change of the two-layer porcelain laminate veneer after adding veneering porcelain of different thickness to the 0. 2 mm thick aluminum oxide. Methods : Ten aluminum oxide disks were ...Objective : To evaluate the color change of the two-layer porcelain laminate veneer after adding veneering porcelain of different thickness to the 0. 2 mm thick aluminum oxide. Methods : Ten aluminum oxide disks were randomized into 2 groups. Each of five disks was veneered with Vita Lumin Shade 54 porcelain of thickness 0/0.4 mm and 0. 6 mm respectively. The L'a'b* color notations of the substrate covered with nan-veneered disks and 2 thickness porcelain veneered disks were measured separately and the color differences (AE) were calculated. Results ?Statistically significant differences in color coordinates of dark substrates were recorded after the substrate was covered by an aluminum oxide disk and also after the addition of veneering porcelain to the aluminum oxide disks in group 1 (P=0. 000 2) and group 2(P=0. 007 5) and between 2 groups (P=0. 000 1). Conclusion -The ability of masking underlying discoloration was increased and shifted to gray when the thickness of veneering porcelain increased.展开更多
BdlR strain killifish Oryzias latipes, which can be found in natural populations in Kochi Prefecture, Japan, exhibit a fading body-color. The aim of this article is trace of body fade by enzymatic analysis especially ...BdlR strain killifish Oryzias latipes, which can be found in natural populations in Kochi Prefecture, Japan, exhibit a fading body-color. The aim of this article is trace of body fade by enzymatic analysis especially blacking key enzyme tyrosinase. A single scale was collected from a single specimen of this strain at the dorsal axis, and the supernatant fi-action developed from this sample served as a tyrosinase extract. The extract fraction showed low tyrosinase activity when L-tyrosine, L-dopa and L-dopamine were used as enzyme substrates. After addition of L-cysteine to the sample scale, surface color gradually faded as pheomelanin formed. Tyrosinase was believed to have been in the folded phase and especially active arotmd the catalytic site and copper was detected in the scale. In hereafter, molecular analysis can attain above purpose.展开更多
Response surface methodology was used in this research to optimize the technical parameters of the extraction and conversion color compound in armatto seeds into norbixin. Parameters affected the extraction efficiency...Response surface methodology was used in this research to optimize the technical parameters of the extraction and conversion color compound in armatto seeds into norbixin. Parameters affected the extraction efficiency and norbixin recovery yield were solvent concentration, rate of solvent/seed, incubation time, and incubation temperature. The optimization results including： concentration of ethanol is 51.82°; concentration of NaOH is 0.52 M; ratio of solvent/seed is 7.1/1; incubation time is 33.12 minutes, incubation temperature is 58.6℃, and the rate of 36% HCl/color solution is 0.5/5 （v/v）.展开更多
文摘Objective : To evaluate the color change of the two-layer porcelain laminate veneer after adding veneering porcelain of different thickness to the 0. 2 mm thick aluminum oxide. Methods : Ten aluminum oxide disks were randomized into 2 groups. Each of five disks was veneered with Vita Lumin Shade 54 porcelain of thickness 0/0.4 mm and 0. 6 mm respectively. The L'a'b* color notations of the substrate covered with nan-veneered disks and 2 thickness porcelain veneered disks were measured separately and the color differences (AE) were calculated. Results ?Statistically significant differences in color coordinates of dark substrates were recorded after the substrate was covered by an aluminum oxide disk and also after the addition of veneering porcelain to the aluminum oxide disks in group 1 (P=0. 000 2) and group 2(P=0. 007 5) and between 2 groups (P=0. 000 1). Conclusion -The ability of masking underlying discoloration was increased and shifted to gray when the thickness of veneering porcelain increased.
文摘BdlR strain killifish Oryzias latipes, which can be found in natural populations in Kochi Prefecture, Japan, exhibit a fading body-color. The aim of this article is trace of body fade by enzymatic analysis especially blacking key enzyme tyrosinase. A single scale was collected from a single specimen of this strain at the dorsal axis, and the supernatant fi-action developed from this sample served as a tyrosinase extract. The extract fraction showed low tyrosinase activity when L-tyrosine, L-dopa and L-dopamine were used as enzyme substrates. After addition of L-cysteine to the sample scale, surface color gradually faded as pheomelanin formed. Tyrosinase was believed to have been in the folded phase and especially active arotmd the catalytic site and copper was detected in the scale. In hereafter, molecular analysis can attain above purpose.
文摘Response surface methodology was used in this research to optimize the technical parameters of the extraction and conversion color compound in armatto seeds into norbixin. Parameters affected the extraction efficiency and norbixin recovery yield were solvent concentration, rate of solvent/seed, incubation time, and incubation temperature. The optimization results including： concentration of ethanol is 51.82°; concentration of NaOH is 0.52 M; ratio of solvent/seed is 7.1/1; incubation time is 33.12 minutes, incubation temperature is 58.6℃, and the rate of 36% HCl/color solution is 0.5/5 （v/v）.
