. Ameboid movement. Amoeboid movement; Amoeba. AMEBOID MOVEMENT 53 two rapidly growing regions on the anterior edge, leading in dif- ferent directions, that particle is attracted to the edge less rapidly than a particle lying immediately back of either advancing region. As may readily be observed each change in speed or direction of movement of the particle b finds its explanation in the amount and location of ectoplasm formation at the time. Large particles like a do not so readily reflect changes in the direction of pull of the surface layer. The rapid rate of movement of particle a— time
. Ameboid movement. Amoeboid movement; Amoeba. AMEBOID MOVEMENT 53 two rapidly growing regions on the anterior edge, leading in dif- ferent directions, that particle is attracted to the edge less rapidly than a particle lying immediately back of either advancing region. As may readily be observed each change in speed or direction of movement of the particle b finds its explanation in the amount and location of ectoplasm formation at the time. Large particles like a do not so readily reflect changes in the direction of pull of the surface layer. The rapid rate of movement of particle a— times as fast as the ameba—finds its explanation in an actively advancing an- terior edge that was unusually wide. Particle b moved at a slower rate, to i. It started from near the posterior edge where it moved comparatively slowly for a short distance. Figure 18 shows more pronounced changes in the direction taken by a particle attached to the back of an ameba. The change in direction at stage 6 was caused by a wave of ectoplasm thrown out at the left side, and cessation of movement at the. \5 Figure 18. Illustrating the effect on the path of a particle attached to the surface film of an Amoeba sphaeronucleosus when the ameba changes its direction of movement. From stages 3 to 5 the ameba veered to the right, also the particle. From stages 6 to 9 the ameba turned sharply to the left, and this change of direction was reflected in the movement of the particle. Length of the ameba, about 120 microns. anterior edge. At 7 a small wave was thrown out at the anterior edge and a large wave on the left. At stages 8 and 9 the direc- tion of the particle was again a response to the waves of ecto- plasm thrown out at the left anterior edge, which thus became the anterior Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origin
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherprinc, bookyear1920
