. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 230 PAUL K. CHIEN, GROVER C. STEPHENS AND PATRICK L. HEALEY. internal surface <io M ) FIGURE 8. Velocity of taurine uptake by isolated pieces of Glyccra body wall as a func- tion of the medium concentration. The vertical bars indicate standard deviations. The broken lines show the U5'<' confidence interval of the linear regression calculated by the least squares method. Hofstee plot results in a straight vertical line, which does not intercept the ordinate (Fig. 9). The rate of uptake is much lower than that shown by t
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 230 PAUL K. CHIEN, GROVER C. STEPHENS AND PATRICK L. HEALEY. internal surface <io M ) FIGURE 8. Velocity of taurine uptake by isolated pieces of Glyccra body wall as a func- tion of the medium concentration. The vertical bars indicate standard deviations. The broken lines show the U5'<' confidence interval of the linear regression calculated by the least squares method. Hofstee plot results in a straight vertical line, which does not intercept the ordinate (Fig. 9). The rate of uptake is much lower than that shown by the external surface in agreement with the observations on glycine and phenylalanine reported above. DISCUSSION The general organization of the body wall of G lye era is typical of that of errant polychaetes. The ultrastructure of the peritoneum is similar to that which lines the coelomic surface of the proventriculus of 5\y///.$• (Boilly, 1970). The cuticle of Glyccra stains blue with paraldehyde-fuchsin which suggests the presence of collagen protein. Our qualitative ammo acid analysis shows the presence of high concentrations of hydroxproline and glycine which is characteristic of both verte- brate and invertebrate collagen (Astbury, 1947; Watson and Smith. 1956; Watson, 1958). We believe the fine fibrils seen in the orthogonal tubules are actually collagen fibrils. The term "tubules" is used only as a descriptive term. This is the only example of collagen tubules we know. Our observations made on cuticle of Nereis liinnicoli and Stauronereis rndolphi show solid fibers like those reported for Syllis (Boilly, 1970). The orthogonal arrangement of collagen fibers is com- mon and has been described in cuticle of nemerteans, molluscs, echinoderms and the basement lamella of platyhelminthes, fish and amphibians as well as human. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and app
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
