. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 62 D. W. KRAUS ET Figure 6. Externally recorded action potential traces of bivalve cerebro-visceral connectives at different temperatures. The stimulus artifact occurs on the left of each trace. (Fig. 7). Conduction velocities corresponding to near- habitat temperatures were comparable: ± cm/s for T. altemata, ± cm/s for 5. solidissima, ± cm/s for T. plebeius, and ± cm/s for G. demissa. Differences could not be attributed to the pres- ence of neurohemoglobin (P > ). There was no
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 62 D. W. KRAUS ET Figure 6. Externally recorded action potential traces of bivalve cerebro-visceral connectives at different temperatures. The stimulus artifact occurs on the left of each trace. (Fig. 7). Conduction velocities corresponding to near- habitat temperatures were comparable: ± cm/s for T. altemata, ± cm/s for 5. solidissima, ± cm/s for T. plebeius, and ± cm/s for G. demissa. Differences could not be attributed to the pres- ence of neurohemoglobin (P > ). There was no corre- lation between conduction velocities and conduction distances at all temperatures, indicating relatively con- stant conduction velocities along entire connective seg- ments. Horridge (1958) reported 20-30 cm/s as the con- duction velocity of cerebro-visceral connectives from the bivalve Mya arenaria. Other nerves with small diameter unmyelinated axons have similar conduction velocities: cm/s for the garfish olfactory nerve ( ^m diame- ter axons; Ritchie and Straub, 1975) and cm/s for the medial bundle-lateral portion of the burbot olfactory nerve ( ^m diameter axons; Doving and Gemne. 1965). Increases in conduction velocity due to temperature increase were relatively similar among the connectives studied (Fig. 7). The computed temperature coefficients (Qios) showed little variation between connectives with and without neurohemoglobin. Conduction velocity QioS for other nerves with small axons are: , between 8 and 22°C, for garfish olfactory nerve (Ritchie and Staub, 1975), and , between 8 and 34°C, for burbot olfactory nerve (Doving and Gemne, 1965). Other similar Q,0s are , between 13 and 23°C, for giant fibers from the earth- worm (Lagerspetz and Talo, 1967), and , between 5 and 30°C, for vertebrate myelinated A-fibers (Gasser, 1931). Refractory periods corresponding to near-habitat tem- peratures of each species also have sim
Size: 1895px × 1318px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
