. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL MOTILITY 229. Figure 1. Electron micrographs of Spisula sperm: midpiece ami head. Control sperm (A, C, E) ami sperm exposed to 50 uM goss\pol for 10 mill fB. D, Ft. SEM shows the change in the head surface and \wclling of the midpiece (Bl as compared lo the control (A). TEM reveals swelling of the midpiece with the appearance of man\ cvto- I'linmic particles in the gossypol treated sperm (D): control sperm appears normal (C). Free-e-fracture replicas also reveal changes in the cell membrane with altered distribution of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CELL MOTILITY 229. Figure 1. Electron micrographs of Spisula sperm: midpiece ami head. Control sperm (A, C, E) ami sperm exposed to 50 uM goss\pol for 10 mill fB. D, Ft. SEM shows the change in the head surface and \wclling of the midpiece (Bl as compared lo the control (A). TEM reveals swelling of the midpiece with the appearance of man\ cvto- I'linmic particles in the gossypol treated sperm (D): control sperm appears normal (C). Free-e-fracture replicas also reveal changes in the cell membrane with altered distribution of intramembrane particles in the gossypol treated sperm IF) as compared to the control spenn (E). For identification of cellular components, see schematic in S. Inoue et al. (3). Scale bar = I urn. Reference: Biol. Bull. 193: 229-230. (October, 1997) Orientation of Motile Unicellular Algae to Oxygen: Oxytaxis in Euglena D. Marshall Porterfield (BioCnrrents Research Center, Marine Biological Laboratory, Woods Hole, Massachusetts 02543) Oxygen sensing by a microorganism was first demonstrated by Engelmann (I) in his experiment that determined the photo- synthetic action spectrum. In motile bacteria, a positive chemo- tactic response to oxygen was subsequently observed as a net migration to environments that are better aerated (2). In fungi, growth responses toward oxygen are thought to be responsible for self avoidance in hyphae (3). In higher plants, oxygen has only recently been shown to play a direct role in determining root orientation (oxytropism) (4). To understand these responses and the associated pathways of signal transduction in higher plants, it may be easier to first study the response in an algal 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
Size: 1118px × 2234px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
