Tomoki Nawata

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By injuring cells ofValonia ventricosa, one of two survival strategies — wound-healing and protoplast formation — is induced. The present study revealed that turgor pressure, as well as Ca2+ in bathing medium, is involved in the choice between these survival strategies. On the process of wound-healing, turgor pressure is recovered in the presence of both(More)
1. The ionic dependency of the flash-triggering action potential (FTP) evoked across the vacuolar membrane inNoctiluca was studied by injecting various salt and pH buffer solutions into the vacuole. 2. Electron microscopic observations showed that the peripheral cytoplasmic compartment sandwiched between vacuole and pellicle is 0.11±0.07 μm in thickness, so(More)
1. Trinitrophenyl AMP (TNP-AMP) in the concentration range 10-300 microM induced an increase in fluorescence intensity at around 530 nm in skinned skeletal muscle fibres freshly obtained from rat psoas muscle. 2. The fluorescence intensity of the fibres depended on TNP-AMP concentration up to approximately 200 microM. The Kd of TNP-AMP binding to the muscle(More)
Feeding behavior ofNoctiluca miliaris cultured together with a food organism,Dunaliella tertiolecta, an unicellular green alga, was studied. The feeding process was separated into successive four steps. (1) Food is trapped on the tentacle tip covered with mucus secreted from the alveolar pore. (2) The food is carried by bending the tentacle to the cytostome(More)
We used an extracellular vibrating probe to investigate local transmembrane ion currents that occur just before and during localized cytoplasmic movement associated with feeding initiation in the marine dinoflagellateNoctiluca, Our results indicates that the currents flow only through a specialized cellular region, the sulcus, suggesting a heterogeneous(More)
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