. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 7. (A) Longitudinal section of the distal part of a bacterio- cyte demonstrating the dense packing of bacteria (arrowheads). Only one morphological type of bacterium is observed. Scale 2 /zm. (B) Cell envelope of the bacterium with a typical gram-negative pattern (arrow) and the adjacent unit membrane (arrowhead) of the host cell. Scale 50 nm. (C) Typical parallel arrangement of bacteria in the apical region of a bacteriocyte. Note anastomoses in vacuoles containing bacteria (arrowhead) and the opening of one vacuole
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 7. (A) Longitudinal section of the distal part of a bacterio- cyte demonstrating the dense packing of bacteria (arrowheads). Only one morphological type of bacterium is observed. Scale 2 /zm. (B) Cell envelope of the bacterium with a typical gram-negative pattern (arrow) and the adjacent unit membrane (arrowhead) of the host cell. Scale 50 nm. (C) Typical parallel arrangement of bacteria in the apical region of a bacteriocyte. Note anastomoses in vacuoles containing bacteria (arrowhead) and the opening of one vacuole to the outside (arrow). Scale /xm. (D) Bacterium containing membrane-bound electron-lu- cent vacuoles. Scale fim. (E) Rod-shaped bacterium with peripher- ally arranged granular plasma and centrally condensed DNA, but without vacuoles. Scale /xm. Micrograph D is from a specimen with high S° content in the gill; E from a specimen with low S" in its »-'' Figure 8. (A) Opening of a bacterium-containing vacuole to the outside of the cell. Scale pirn. (B) Apical tip of bacteriocytes in cross section showing anastomoses (arrowheads) between the bacterium-con- taining vacuoles. Scale ^m. (C) Basal part of bacteriocytes. Abun- dant non-membrane-bound electron-lucent vacuoles (v) whose content might have been partly extracted during preparation. Scale 5 ^m. (D) Basal part of bacteriocytes. Structures resembling phagolysosomes (p) in different stages. Scale 2 [im. to 50 /jm long, maximum diameter about 8 //m) are visi- ble on each cross section through the filament. The cytological structure of the bacteriocytes is fairly uniform. Their surface is studded with ^<m-long mi- crovilli. The outer parts of these cells are densely filled with inclusions that resemble bacteria (Figs. 3C, 7. 8). Most are about //m (length) by pm (width), but some may reach a size of 4 //m by 1 //m. Their cell enve- lope is of the gram-negative type with clearly v
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
