. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ^y "''â â 'go o5 ci! o Po . Figure 8. Transmission electron micrographs showing morphology of lumen of accessory nidamental gland at two stages of development. (A) At 129 days, vast numbers of cilia (cil) in the lumen (lum) are surrounded by squid epithelial tissue (ec). (B) In the sexually mature female, microvilli (mv) outnumber the ciliaandadensecolony of symbi- otic bacteria (bac) resides in the lumen. Magnification bar = .5 /jm. In the L. opalescens egg case, the most probable mode of transmission of bacteria to th
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ^y "''â â 'go o5 ci! o Po . Figure 8. Transmission electron micrographs showing morphology of lumen of accessory nidamental gland at two stages of development. (A) At 129 days, vast numbers of cilia (cil) in the lumen (lum) are surrounded by squid epithelial tissue (ec). (B) In the sexually mature female, microvilli (mv) outnumber the ciliaandadensecolony of symbi- otic bacteria (bac) resides in the lumen. Magnification bar = .5 /jm. In the L. opalescens egg case, the most probable mode of transmission of bacteria to the female accessory nida- mental gland might intuitively appear to be vertical trans- mission, in which the juveniles encounter the bacteria upon hatching. However, by showing that the AN gland is not differentiated until about 11 weeks post-hatching, this study provides direct evidence that there is no vertical transmission of microorganisms to early hatchlings. Hori- zontal transmission to juveniles thus most likely occurs from the water column at a later point in development. This time is signiticantly after hatching: distinct morpho- / ®i. ©Q . 0 ° )'BW^ Figure 9. Electron micrograph of â â secretory vesicles" at the cell surface of the epithelial cells of the accessory nidamental gland. Arrows designate two examples of this secreted material. Magnification bar = 2 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 original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
Size: 1391px × 1796px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, booksubjectbiology, booksubjectzoology
