22种必需和非必需微量元素的浓度(Be,Al,V,Cr,Mn,Fe,Co,Ni,Cu,Zn,As,Se,Mo,Ag,Cd,Sb,Ba,Tl,Pb,Th,U,和Hg)是在来自日本海的斑点海豹的母胎对(在怀孕的最后三个月)的器官中测量的。首次报道了11种元素的浓度。检查了这对夫妇的八个器官:肺,心,肝脏,肾脏,肠子,脾,脾肌肉,和骨头。在母体器官中检测到的所有微量元素也以各种浓度在胎儿器官中发现。胎盘不是阻止非必要元素进入胎儿的有效屏障,但是可以控制其中一些的进入,例如,铝,镉,和水银。在胎儿的大多数器官中,有毒微量元素的浓度(铍,锑,钍,和铀)明显高于母亲的相同器官,这表明在怀孕期间,女性通过胎盘屏障将其转移到胎儿体内,从而去除多余的非必需微量元素。
Concentrations of 22 essential and non-essential trace elements (Be, Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Mo, Ag, Cd, Sb, Ba, Tl, Pb, Th, U, and Hg) were measured in the organs of a mother-fetus pair (at the last trimester of pregnancy) of spotted seals from the Sea of Japan. The concentrations of eleven elements are reported for the first time. Eight organs of the pair were examined: lungs, heart, liver, kidneys, intestines, spleen, muscles, and bones. All trace elements detected in the organs of the mother were found also in the organs of the fetus at various concentrations. Placenta is not an effective barrier to prevent non-essential elements from getting into the fetus, but can control entry of some of them, e.g., aluminum, cadmium, and mercury. In most organs of the fetus, the concentrations of toxic trace elements (beryllium, antimony, thorium, and uranium) were noticeably higher than in the same organs of the mother, which indicates that during pregnancy female removes excess of non-essential trace elements by transferring them to the fetal body through the placental barrier.