Miyake Y, Tada H, Yano M, Shimizu H
Department of Information and Computer Engineering, Kanazawa Institute of Technology, Ishikawa, Japan.
Cell Struct Funct. 1994 Dec;19(6):363-70. doi: 10.1247/csf.19.363.
The relationship between intracellular period modulation and external environment change was investigated from the viewpoint of internal information coding in Physarum plasmodium. For the external conditions, concentration changes of attractant (galactose) and repellent (KCl) were used, and the internal responses were measured as the thickness oscillation of the plasmodium. (i) Period of the intracellular oscillation decreased when the concentration of attractant was increased and when the concentration of repellent was decreased. (ii) The period increased when the attractant was decreased and when the repellent was increased. (iii) The larger concentration change induced the larger period modulation. (iv) These responses were observed when the change of concentration was greater than a threshold value. From these results, it was clarified that the relative change in environmental condition is encoded on the relative period modulation in intracellular oscillation. This means that the period change does not directly represent the environment itself but represents the change of its condition. Thus, it is further suggested that the plasmodium estimates the environmental condition based on the relationship between the previous external condition and the present one.
从多头绒泡菌原质团内部信息编码的角度，研究了细胞内周期调制与外部环境变化之间的关系。对于外部条件，使用引诱剂（半乳糖）和驱避剂（氯化钾）的浓度变化，并将内部反应测量为原质团的厚度振荡。（i）当引诱剂浓度增加且驱避剂浓度降低时，细胞内振荡的周期缩短。（ii）当引诱剂减少且驱避剂增加时，周期延长。（iii）较大的浓度变化引起较大的周期调制。（iv）当浓度变化大于阈值时观察到这些反应。从这些结果可以看出，环境条件的相对变化被编码在细胞内振荡的相对周期调制上。这意味着周期变化并不直接代表环境本身，而是代表其条件的变化。因此，进一步表明，原质团根据先前的外部条件与当前条件之间的关系来估计环境条件。
