. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Y. SUN AND R. J. WYMAN Figure 2. Stage-10 egg chamber showing our best example of a cur- rent pattern that could be responsible for returning an intrafollicular transport current. Scale bars: 3 MA/cirr; 80 microns. (A) Vectors, as originally obtained, showing two dimensions of current flow. (B) Nor- malized vectors showing only current component perpendicular to egg chamber surface. in Figure 1; measurements taken with the eggs oriented vertically showed similarly sized currents and no particu- lar pattern (further examples
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Y. SUN AND R. J. WYMAN Figure 2. Stage-10 egg chamber showing our best example of a cur- rent pattern that could be responsible for returning an intrafollicular transport current. Scale bars: 3 MA/cirr; 80 microns. (A) Vectors, as originally obtained, showing two dimensions of current flow. (B) Nor- malized vectors showing only current component perpendicular to egg chamber surface. in Figure 1; measurements taken with the eggs oriented vertically showed similarly sized currents and no particu- lar pattern (further examples are shown in Figs. 5A-D). Table I presents data on the current vectors around the anterior and around the posterior hemispheres (see be- low). Most of the measurements were on the order of 1 microampere/cm2. This magnitude is at or below the limit of reproducibility of the measurements. No consis- tent direction of current flow appeared in our set of mea- surements. By simply averaging all the vectors over each half of the egg chamber we found that 10 egg chambers had mean inward currents over the oocyte half and mean outward currents over the nurse cell half. Eleven egg chambers had average currents in the reverse direction. The vectors in Figure 1 are the resultant vectors de- rived from a probe vibrating in two dimensions. Previous reports have used measurements from a one dimensional probe; in these reports only the component of current normal to the egg chamber surface was measured. Of course, having both dimensions of data provides a better basis for evaluating the presence or absence of a pattern. However, to compare our data with those previously re- ported, it was possible for the cases shown in Table I, to resolve our vectors into normal (perpendicular to the egg chamber surface) and parallel components. Figures 2 and 3 show the vectors before and after the normaliza- tion < li -41 SA. Please note that these images are extracted from scanned page images
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
