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  • 1
    Electronic Resource
    Electronic Resource
    Axenic Cultivation and Electron Microscopy of Two Species of Choanoflagellida (1970)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 17 (1970), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. Semi-defined basal media have been formulated for 2 species of axenically reared choanoflagellates. High cell yield of Acanthoecopsis sp. is routinely obtained. Diaphanoeca grandis grows less well, but continuous serial transfers assure cells in good phyiologic condition. Loricas of both species have been examined by electron microscopy for gross structural details.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1970.tb02358.x
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  • 2
    Electronic Resource
    Electronic Resource
    Surface Ultrastructure of Some Tests of Recent Foraminiferida from the Dry Tortugas, Florida (1967)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 14 (1967), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: SYNOPSIS. The surface ultrastructure of 10 species of benthic Foraminiferida from the Dry Tortugas, Florida, has been investigated using an electron microscope. Tests of miliolid Foraminiferida appear to be made up of at least 2 distinct layers. An outermost pavement-like layer, consisting of a single layer of calcite rhombohedrons, and an underlying “randomly oriented layer” comprise most of the wall thickness. It was possible to differentiate each miliolid species on the basis of a statistical analysis of calcite rhombs making up the pavement-like layer. Pseudopores were found on the tests of Miliolinella subrotunda (Montagu) and Archaias angulatus (Fichtel and Moll). None of these pseudopores completely penetrated the wall, and all floored in the “randomly oriented layer.” It is believed that these structures are formed at time of calcification, rather than secondarily at some later time.Calcification in Foraminiferida appears to be a biphasic process similar to that found in most other organisms. Groups of crystals were discernible on surfaces of most porcelaneous and “radiate” calcareous species. This suggests that parallel growth of crystals may be an important process in calcification of many Foraminiferida.A sieve-plate was found in a canal paralleling the test's surface in Cymbaloporetta squammosa (d'Orbigny).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1967.tb02016.x
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  • 3
    Electronic Resource
    Electronic Resource
    Variations in levels of cAMP, DNA and RNA in Streptomyces alboniger under conditions of aerial mycelium formation and repression (1985)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 26 (1985), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The relationship between endogenous levels of cyclic adenosine 3′,5′-monophosphate (cAMP) and the formation of aerial mycelia was investigated in Streptomyces alboniger under conditions of aerial mycelium formation and repression. The relationship between cellular levels of DNA and RNA and aerial mycelium formation was also investigated. In contrast to cellular differentiation in other Streptomyces, neither variations in cAMP, DNA or RNA levels were found to be associated with the development of aerial mycelia in S. alboniger. The regulation of adenylate cyclase in S. alboniger, however, was found to differ from that of Escherichia coli and related organisms in that glucose raised, rather than lowered, endogenous cAMP levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1985.tb01555.x
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  • 4
    Electronic Resource
    Electronic Resource
    Cadmium sorption by bacteria and freshwater sediment (1991)
    Springer
    Journal of industrial microbiology and biotechnology 8 (1991), S. 201-207 
    Details
    ISSN: 1476-5535
    Keywords: Diffusion chamber ; Cadmium-sensitive ; Cadmium-resitant ; Sediment ; Bacteria ; Cadmium-sorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Sorption of cadmium by sediment bacteria and freshwater sediment was investigated using diffusion chambers to simulate the water-sediment interface. Diffusion chambers were constructed to provide two compartments separated by a dialysis membrane. Diffusion of cadmium across the membrane was monitored after pure cultures of sediment bacteria or lake sediments were added to the sediment side of a diffusion chamber. Cellular accumulation of cadmium by cadmium-sensitive and cadmium-resistant bacteria removed between 20% and 80% of the dissolved cadmium from the simulated water column and pore water. Cellular accumulation of cadmium was greatest for cadmium-sensitive isolates that were tested. Sediment with an intact microbial community sequestered 80% of the cadmium added to sediment, whereas autoclaved sediment retained 97% of the metal that was added. Addition of glucose to cadmium-amended sediment decreased retention of cadmium by untreated and autoclaved sediments, resulting in elevated concentrations of dissolved cadmium in the simulated water column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01575854
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  • 5
    Electronic Resource
    Electronic Resource
    Accumulation of cadmium by immobilizedZoogloea ramigera 115 (1990)
    Springer
    Journal of industrial microbiology and biotechnology 6 (1990), S. 123-128 
    Details
    ISSN: 1476-5535
    Keywords: Zoogloea ramigera ; Immobilization ; Adsorption ; Cadmium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Zoogloea ramigera 115 was immobilized into beads of calcium-alginate and placed into batch air-bubbled column reactors. In the absence of any added nutrients the immobilized bacterium adsorbed Cd from solutions containing levels of 2 and 20 μg ml−1 per day, over a period of 21 and 20 days, respectively. Adsorption of Cd from solutions containing 20 μg ml−1 Cd was better than 90% for 16 days. Beads treated with Cd at 2 μg ml−1 never adsorbed less than 95% of the metal. Alginate adsorbed Cd as well, but inclusion of cells changed the effectiveness of adsorption. Of a 250 μg ml−1 Cd solution, alginate adsorbed 70.4% Cd in 60 min whereas alginate plus cells adsorbed 90.5% in the same time span. Temperature had no effect on adsorption by immobilized cells at levels of 2 and 10 μg ml−1 Cd. However at higher concentrations, binding was enhanced as temperature increased.Z. ramigera beads were stable during all treatments and for prolonged periods of time (21 days).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01576431
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  • 6
    Electronic Resource
    Electronic Resource
    Translocation of mercury and microbial adaptation in a model aquatic system (1980)
    Springer
    Bulletin of environmental contamination and toxicology 25 (1980), S. 456-464 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985554
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  • 7
    Electronic Resource
    Electronic Resource
    Effects of pH, temperature, and Eh on the uptake of cadmium by bacteria and an artificial sediment (1982)
    Springer
    Bulletin of environmental contamination and toxicology 28 (1982), S. 697-704 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01605638
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  • 8
    Electronic Resource
    Electronic Resource
    Bacteria and cadmium interactions in natural and laboratory model aquatic systems (1984)
    Springer
    Archives of environmental contamination and toxicology 13 (1984), S. 271-277 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Cadmium-resistant bacterial populations were examined in sediments of the Ottawa River, near Lima, Ohio, at a site that had elevated levels of Cd, Cr, Cu, Ni, Zn, and Fe. The percentage of the bacterial population that was resistant to cadmium was higher at the metal-contaminated site than at a less contaminated site downstream.Bacillus was the most abundant genus of the total river sediment population recovered andPseudomonas was the most abundant Cd-resistant genus recovered. Types and distribution of bacterial populations in 40 liter laboratory model aquatic systems were examined over a ten-week period during the continuous addition of 10 mg Cd+2 per day. The Cd level in the water column rose rapidly through the first two weeks and reached a maximum of 3 μg Cd/ ml. Sediment Cd levels rose most rapidly after 5 weeks and reached a concentration of 270 μg Cd/g after 10 weeks. The bacteria in the water column responded to the Cd treatment with increased Cd resistance more quickly and to a greater degree than the bacteria in the sediment. The types of Cd-resistant bacteria isolated in the model systems were similar to Cd-resistant bacteria isolated from sediments of the Ottawa River.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01055277
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  • 9
    Electronic Resource
    Electronic Resource
    Adsorption of mixed metals and cadmium by calcium-alginate immobilized Zoogloea ramigera (1989)
    Springer
    Applied microbiology and biotechnology 31 (1989), S. 613-618 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Zoogloea ramigera 115 cells were immobilized into beads of calcium alginate and used in air-bubbled column reactors to remove cadmium (Cd), zinc (Zn), manganese (Mn), lead (Pb), copper (Cu) and strontium (Sr) from dilute and concentrated solutions. By placing three bubble columns in sequence it was possible to achieve Cd adsorption efficiencies of 99% or greater. During ten applications of approximately 100 μg·ml-1 Cd to three reactors in sequence, the immobilized Z. ramigera adsorbed 99.9% of the metal. The efficiency of the first column decreased from 92.2% on the first day to 53.8% on the tenth day, but the overall efficiency remained high because of the other two reactors. Exposure of bubble columns to mixed metal solutions yielded similar results. Cd, Zn, Mn, Cu, and Sr were adsorbed at 95.9% or better when concentrations in the mixtures ranged from 12 to 117 μg·ml-1 per metal. Pb was the least efficiently adsorbed metal with 81.3% and 74.7% removed from solutions containing 12 and 23 μg·ml-1, Pb respectively. Recovery and concentration of the metals was possible with nitrilotriacetic acid (NTA) treatment; which desorbed 〉77% of the accumulated Cd from the immobilized cells. Recovery of metals from beads which had been exposed to mixed metals depended on the metal; only 5.8% of the adsorbed Sr was recovered, but 98.3% of Zn was desorbed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270805
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  • 10
    Electronic Resource
    Electronic Resource
    Effects of cadmium accumulation on growth and respiration of a cadmium-sensitive strain of Bacillus subtilis and a selected cadmium resistant mutant (1984)
    Springer
    Archives of microbiology 140 (1984), S. 107-112 
    Details
    ISSN: 1432-072X
    Keywords: Cadmium ; Toxicity ; Accumulation ; Bacillus subtilis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effects of cadmium on the growth and respiration of two strains of Bacillus subtilis are compared to the accumulation of Cd by viable and cyanide-killed cells, protoplasts and cell fractions of the strains. Growth and respiration of strain 1A1 were significantly inhibited at 10μg Cd2+/ml while the growth and respiration of strain 1A1R, a selected mutant of 1A1, were only slightly affected. Similarly, 1A1R protoplasts were more resistant to Cd than were 1A1 protoplasts. The differential resistance of the strains correlates with the accumulation of Cd by the two strains, with 1A1 accumulating approximately 10 times the level of Cd after a 4 h exposure to 1 μg Cd2+/ml. The distributions of Cd throughout the cells, however, were similar between strains. Based on the accumulation of Cd by cyanide-killed protoplasts, uptake of Cd by 1A1 appears to be an active process, while for 1A1R, Cd accumulation is independent of protoplast viability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454911
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