physarum
IB-physarum-advection
In Physarum a stimulus self-propagates ADVECTIVELY on the cytoplasmic shuttle-streaming flow at 1-20 um/s, in the laminar regime (Reynolds number ~0.0008) — a fully CLASSICAL transport mechanism, no quantum effects required.
Observed quantities
self-propagation / signal speed 1-20 um/s; Reynolds number ~0.0008 (laminar)
01
Primary source
- Alim et al. 2017, PNAS — signal propagation in Physarum
- Alim et al. 2013, PNAS — random-network peristalsis
02
Boundary of this block
Companion measured result (Alim 2013): net peristaltic transport is maximised when the contraction wavelength ~ organism size; folded here rather than made a separate block.
03
Connections
Outgoing
- relates to CLAIM (refuted): Physarum holds its body-wide memory 'aloft' via a single, globally phase-locked STANDING WAVE that keeps the imprint statically fixed. the real mechanism is organized advective flow, not a static global lock
- relates to In Physarum actomyosin, Ca2+ INHIBITS contraction — the opposite sign to animal striated muscle — and intracellular Ca2+ oscillates near-antiphase with tube radius. the Ca2+ oscillator is the pump behind this advective flow
Incoming
- relates from In Physarum actomyosin, Ca2+ INHIBITS contraction — the opposite sign to animal striated muscle — and intracellular Ca2+ oscillates near-antiphase with tube radius. this Ca2+ oscillator is the pump that drives the shuttle-streaming flow doing the transport
- relates from CLAIM (refuted): Physarum holds its body-wide memory 'aloft' via a single, globally phase-locked STANDING WAVE that keeps the imprint statically fixed. what actually holds the pattern is organized advective re-broadcast, not a fixed standing wave