Variations in nitrogen isotopic discrimination values among the different tissues and between nitrogen fractions within tissues for rats fed a milk protein- or a soy protein-based diet for 3 wk.

Weighted isotopic discrimination values (Δ15N) were calculated for each visceral tissue (as the weighted average of its protein and non-protein fractions Δ15N reported in Fig. 1) and globally for the visceral tissues (as the weighted average of liver, small intestine mucosa, stomach, kidneys and colon Δ15N). Differences in Δ15N values between protein and non-protein fractions (Δ15NPF- Δ15NnPF) were calculated for each tissue. Values are means ± SD.*Effect of the dietary protein source on tissue Δ15N and Δ15NPF- Δ15NnPF values (Post hoc tests with Tukey adjustments, PP15NPF- Δ15NnPF values of the small intestine mucosa with the SP diet and of the liver with both diets. Values with different letters in a given column are significantly different (Post hoc tests with Tukey adjustments, P

针对每一块内脏组织，计算其加权同位素判别值（Δ15N），即该组织蛋白质组分与非蛋白质组分Δ15N的加权平均值（详见图1）；同时针对所有内脏组织整体计算全局加权同位素判别值（Δ15N），即肝脏、小肠黏膜、胃、肾脏与结肠Δ15N的加权平均值。针对每一种组织，计算其蛋白质组分与非蛋白质组分间的Δ15N差值（即Δ15NPF - Δ15NnPF）。所有数值均以平均值±标准差（SD）表示。*膳食蛋白质来源对组织Δ15N及Δ15NPF - Δ15NnPF值的影响（采用Tukey校正的事后检验，其中SP日粮组小肠黏膜与两种日粮组肝脏的Δ15NPF - Δ15NnPF值。同一列中带有不同字母的数值组间存在显著差异（采用Tukey校正的事后检验，P）。