Electron micrographs bacteria

FIGURE 11.22 If the cell walls of bacteria such as Escherichia coli are partially digested and the cells are then osmotlcally shocked by dilution with water, the contents of the cells are extruded to the exterior. In electron micrographs, the most obvious extruded component is the bacterial chromosome, shown here surrounding the cell. (Dr. Gopal Murti/CNRI/Phototakr NYC)... 

Fig. 8.4. Transmission electron micrograph of a section through the intestine of Acrobeloides nanus, which has been grown in a culture of Clavibacter toxicus. Note the crushed cells of the bacteria. Scale bar = 500 nm.

As one may expect from the diversity of microorganisms that can reduce iron, the spectrum ranges from bacteria that can use only amorphous Fe(III) hydroxide/oxide (e.g., T. ferrireducens) and apparently require direct contact with the Fe(III) precipitate, as shown by electron micrographs (Slobodkin et al. 1997b), to bacteria that can utilize various forms of Fe(III) ion as precipitated hydroxide or as complexed soluble ions, such as Fe(III) citrate, to bacteria such as T. saccharolyticum that can use only soluble Fe(III) citrate but are stimulated by the addition of increased Fe(III) ions. Further studies must to be done to elucidate the nature and which of the bacteria excrete electron mediators (so no direct contact would be required) and which contain cell-wall-bound reductases (which require a direct contact with the Fe(III) precipitate). 

Fig. 5. Electron micrograph of particle chain in magnetotactic bacteria. The bar = 500 nm [66] (photo credit Gorby Y, Blakemore R, Microbiology Department, University of New Hampshire)...

Figure 1-2 Transmission electron micrograph of a dividing cell of Escherichia coli 0157 H7 attached to the intestinal epithelium of a neonatal calf. These bacteria, which are able to efface the intestinal microvilli, form characteristic attachments, and secrete shiga toxins, are responsible for -73,000 illnesses and 60 deaths per year in the U. S.10a After embedding, the glutaraldehyde-fixed tissue section was immuno-stained with goat anti-0157 IgG followed by protein A conjugated to 10-nm gold particles. These are seen around the periphery of the cell bound to the O-antigen (see Fig. 8-28). Notice the two microvilli of the epithelium. Courtesy of Evelyn A. Dean-Nystrom, National Animal Disease Center, USD A, Agricultural Research Service, Ames, IA.

Bacteria 2. See also Specific genus and species acetic acid 8 aerobes 10 anaerobic 8 autotrophic 8 binding to cells 186 branched fatty acids of 381 chemoheterotrophic 7,8 chemolithotrophic 7 classification of 6-8 coats 431 composition of 31 electron micrograph of 4 flagella 6... 

Electron crystallography 131 Electron micrograph of bacteria 4 of cell junctions 27 of plant cell 13 of starch granules 172 of viruses 246... 

Scanning electron micrographs (SEM) of bioleached shale, which has been leached with the acid produced by sulfur-oxidizing bacteria, have revealed a pitted, spongy-appearing surface texture. Bioleaching removes primarily the carbonate minerals, such as dolomite and calcite, which are apparently deposited in pits throughout the rest of the mineral matrix. The removal of the carbonate would be expected to increase the porosity of the raw shale. Since the results of SEM reveal only the surface... 

Krambeck, C., Krambeck, H.-3. and Overbeck, 3., 1981. Microcomputer assisted biomass determination of plankton bacteria on scanning electron micrographs. Appl. Environ. Microbiol., 42 142-149. 

Fig. 38 a and b. Microstructures resembling iron bacteria contained in the Isua banded iron formation. Fig. b) shows a portion of Fig. a) in higher magnification. Electron micrographs from demineralized rock section (Pflug, 1984b)12+1... 

Figure 9 Transmission electron micrograph of an E. coli bacteria encapsulated in a sihca gel...

FIGURE 8.5 Electron micrograph of a magnetotactic bacteria. (Courtesy of Prof. Matsu-naga, Tokyo University of Agriculture and Engineering, Tokyo, Japan.)... 

Scanning electron micrographs of biooxidized pyrite showed the formation of deep pits in crystal surfaces. The pores appear to be hexagonal in cross-section, consistent with screw dislocations in a cubic crystal lattice (43), and suggesting that the bacteria have attacked... 

Fig. 5.5. Scanning electron micrograph, gold-shadowed, of the bacterial cells obtained from the 10 days culture when the mixture of mudstone and the medium for the sulfate-reducing bacteria was anaerobically incubated at 37°C. Bar 1 pm...

Fig. 5.6 Transmission electron micrograph of a Dictyostelium discoideum cell infected with Legionella pneumophila. The bacteria replicate within a single vacuole. Scale bar = l pm. (Reproduced from Ref [133], with permission from Blackwell Science Ltd.)...

A FIGURE 1-2 Prokaryotic cells have a simpler internal organization than eukaryotic cells, (a) Electron micrograph of a thin section of Escherichia coii, a common intestinal bacterium. The nucleoid, consisting of the bacterial DNA, is not enclosed within a membrane. E. coii and some other bacteria are surrounded by two membranes separated by the periplasmic space. The thin cell wall is adjacent to the inner membrane. 

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