The Rate of the Protoplasmic Flow in the Myxomycete Plasmodium. II

Kamiya, Nobuo

doi:10.1508/cytologia.15.194

Cited by 37 publications

(14 citation statements)

References 7 publications

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“…The resistance curve oscillated with the same frequency as the streaming of the endoplasm, but the phase between the two oscillations was variable. Our observation is consistent with the results of Kamiya (1950b), who reported a relation between the width of the veins and the shuttle streaming. We conclude that the impedance measurements reflect the alternating approach and withdrawal of the wall of one or more veins in the vicinity of the microelectrode.…”

supporting

confidence: 93%

“…However, the variation in the period might be further discussed with regards to the Ca 2+ level, which is known to change during the cell cycle (Jeter et al, 1982, Silver, 1990. The oscillatory patterns of Physarum polycephalum have previously been characterized both as a monorhythmic system (Grebecki and M. CieSlawska, 1978) and a polyrhythmic system (Kamiya, 1950b). Our analyses have shown that there is only one fundamental frequency in Physarum.…”

mentioning

confidence: 65%

“…Ca 2+ , ATP and cAMP is also oscillating, with periods ranging from minutes to several hours (Akitaya et al, 1985, Ueda et al 1983and 1987. Veins exhibit branched structures with walls of gel-like ectoplasm, while fluid endoplasm flows back and forth in the interior at a rate of about 1 mm/sec (Kamiya, 1950a). The ectoplasm performs both radial and longitudinal rhythmic contractions, nor-82 RAGNHILD HALVORSRUD ET AL.…”

Section: Introductionmentioning

confidence: 99%

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Variations in the biological clock of the slime moldPhysarum polycephalummeasured electrically

Halvorsrud

Giæver

Laane

et al. 1993

Journal of Interdisiplinary Cycle Research

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In the plasmodial stage the slime mold Physarum polycephalum exhibits oscillatory phenomena. The ectoplasm contracts regularly, resulting in oscillatory (shuttle) streaming of the endoplasm. This periodic phenomenon represents a biological clock that is not well understood. We have studied quantitatively the stability of the rhythmic contractions in Physarum over long intervals of time using an electrical method that permits in situ measurements of the undisturbed plasmodium. The measured resistance curves were analyzed with fast Fourier transform, and the power spectra revealed one fundamental frequency with several higher harmonics. The period determined from the fundamental frequency (typically 1.8 minutes) was quite stable over 40 hours at defined temperature, humidity and growth conditions, but deviations by a factor of 2 occurred on shorter time scales. The period of the different Physarum specimens varied from 1 to 6 minutes at room temperature.

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supporting

confidence: 93%

mentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

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Variations in the biological clock of the slime moldPhysarum polycephalummeasured electrically

Halvorsrud

Giæver

Laane

et al. 1993

Journal of Interdisiplinary Cycle Research

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“…They are interconnected by a tube structure (Figure 1.2-1 B and C), in which the protoplasm streams periodically owing to the pressure difference generated by the contraction/relaxation rhythm [14]. The plasmodial oscillators are, therefore, considered to be coupled through the protoplasmic streaming.…”

Section: A122 the Plasmodial Slime Moldmentioning

confidence: 99%

Construction of a Living Coupled Oscillator System of Plasmodial Slime Mold by a Microfabricated Structure

Takamatsu

Fujii

2002

Sensors Update

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The cell patterning technique is important for observing living cells in a systematic way, especially from the viewpoint of nonlinear science, which enables us to treat a complicated system such as a living system by a form of mathematics. We developed a cell patterning method and constructed a living coupled oscillator system with the plasmodial slime mold, Physarum polycephalum, using a microfabricated structure.The plasmodium is a large ameboid unicellular organism consisting of an almost homogeneous structure without a highly differentiated system like a nervous system, but it shows a response to change in environment. The response behavior is considered to be caused by the interactions among the cell bodies where internal nonlinear oscillatory phenomena can be observed. Therefore, the plasmodium can be regarded as a coupled oscillator system. In order to understand the mechanism of the behavior of the plasmodium, it is essential to observe the behavior under conditions where the interactions among the cell bodies are systematically controlled.We patterned the shape of the plasmodium by a microstructure fabricated with a photoresist resin (SU-8) by a photolithographic method. With this system, we constructed two-and multiple oscillator systems of the plasmodium and observed oscillation phenomena by controlling the interaction parameters among the oscillators. We found that the oscillation patterns varied dynamically depending on the parameters in the same manner of the prediction by a mathematical model of a coupled oscillator system.This approach with side-by-side analyses is important for understanding complicated biological systems. In addition, for such analyses, the microfabrication technique is one of the key technologies.

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“…These models are consistent with the idea of the Physarum as a membrane-bound reaction diffusion system. Independent of the idea of a natural computing device, the oscillation of protoplasmic flow and the pattern formation of Physarum have also been investigated (Kamiya, 1950;Ishigami, 1986;Miyake et al, 1994;Takahashi et al, 1997;Takamatsu et al, 2000Takamatsu et al, , 2004Takamatsu, 2006). Under various nutrient conditions, the response of Physarum is quantitatively estimated by comparison with the behavior of bacterial colonies (Takamatsu et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

An adaptive and robust biological network based on the vacant-particle transportation model

Gunji

Shirakawa

Niizato

et al. 2011

Journal of Theoretical Biology

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The Rate of the Protoplasmic Flow in the Myxomycete Plasmodium. II

Cited by 37 publications

References 7 publications

Variations in the biological clock of the slime moldPhysarum polycephalummeasured electrically

Variations in the biological clock of the slime moldPhysarum polycephalummeasured electrically

Construction of a Living Coupled Oscillator System of Plasmodial Slime Mold by a Microfabricated Structure

An adaptive and robust biological network based on the vacant-particle transportation model

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