The posterior reticulated regions of the plasmodia of the slime mold, Physarum polycephalum, whose migration has been oriented by direct current (3.0 to 5.0 µa/mm2 in the agar substrate), contain 30 per cent less potassium than the advancing non-reticulated region. The anterior regions have the same potassium concentration as that of the controls, approximately 32 meq/kg wet weight. Differences in potassium concentration between anterior and posterior regions of control plasmodia, not oriented by electric current, are less than 5 per cent. Sodium, in contrast to potassium, is generally less concentrated in the anterior than in the posterior regions of electrically oriented plasmodia, but sodium concentrations are extremely variable. No significant difference in protein concentration was found between oriented and control plasmodia. Thirty-five per cent of the total potassium, but none of the sodium, is found in acidified ethanol precipitates from plasmodial homogenates. Potassium, but not sodium, appears to be closely associated with processes which differentiate anterior from posterior in an oriented plasmodium.
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机译：粘液霉菌的浆膜胞质网的后网状区域（其迁移已通过直流电定向（琼脂基质中为3.0至5.0 µa / mm 2 ）定向，含钾量减少了30％而不是前进的非网状区域。前部区域的钾浓度与对照组相同，湿重约为32 meq / kg。对照疟原虫的前部和后部之间的钾浓度差异（不取决于电流）小于5％。与钾相反，钠的浓度通常比电定向疟原虫的后部浓度低，但钠的浓度变化很大。在定向疟原虫和对照疟原虫之间没有发现蛋白质浓度的显着差异。在来自血浆匀浆的酸化乙醇沉淀物中发现总钾的百分之三十五，但钠无一。钾而不是钠似乎与在定向疟原虫中区分前后的过程密切相关。
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