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  • 1
    Electronic Resource
    Electronic Resource
    Energetics of bacterial adhesion (1990)
    Springer
    Cellular and molecular life sciences 46 (1990), S. 817-822 
    Details
    ISSN: 1420-9071
    Keywords: Bacterial adhesion ; long-range forces ; short-range forces ; electrostatic interaction ; DLVO-theory ; hydrophobicity ; surface Gibbs energy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary For the description of bacterial adhesion phenomena two different physico-chemical approaches are available. The first one, based on a surface Gibbs energy balance, assumes intimate contact between the interacting surfaces. The second approach, based on colloid chemical theories (DLVO theory), allows for two types of adhesion: 1) secondary minimum adhesion, which is often weak and reversible, and 2) irreversible primary minimum adhesion. In the secondary minimum adhesion a thin water film remains present between the interacting surface. The merits of both approaches are discussed in this paper. In addition, the methods available to measure the physico-chemical surface characteristics of bacteria and the influence of adsorbing (in)organic compounds, extracellular polymers and cell surface appendages on adhesion are summarized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01935531
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  • 2
    Electronic Resource
    Electronic Resource
    In vivo 13C NMR analysis of acetate metabolism in Thiobacillus versutus under denitrifying conditions (1986)
    Springer
    Archives of microbiology 146 (1986), S. 227-232 
    Details
    ISSN: 1432-072X
    Keywords: Thiobacillus versutus ; TCA cycle ; 13C incorporation ; PHB metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The disappearance of 2-13C-acetate and the subsequent incorporation of label into cellular metabolites were followed in denitrifying cells of Thiobacillus versutus by 13C NMR spectroscopy. In cells grown under acetate-limitation, the specific rate of consumption was idependent of the density of the cell suspension. An isotopic steady state was reached within 30 min if sufficient substrate was added to the cell suspension. In cells grown under nitrate-limitation, the consumption of 2-13C-acetate proceeded at a significantly lower rate. The decrease and final disappearance of 2-13C-acetate were accompanied by incorporation of 13C into glutamate, glutamine, and by the release of labeled HCO 3 − and CO2. The appearance of a broad resonance being the methyl endgroup of poly-3-hydroxybutyrate (PHB) was indicative for PHB mobilization during the incubation. The sequence of label incorporation and the distribution among the various carbon nuclei were consistent with the operation of the tricarboxylic acid cycle.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00403221
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  • 3
    Electronic Resource
    Electronic Resource
    d-Xylose catabolism in Bacteroides xylanolyticus X5-1 (1994)
    Springer
    Archives of microbiology 161 (1994), S. 521-527 
    Details
    ISSN: 1432-072X
    Keywords: Key words: Pentose phosphate pathway – Embden-Meyerhof-Parnas pathway – Phosphoketolase pathway –Bacteroides xylanolyticus X5-1 – Xylose catabolism – Energy conservation – Cofactor regeneration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. The xylose metabolism of Bacteroides xylanolyticus X5-1 was studied by determining specific enzyme activities in cell free extracts, by following 13C-label distribution patterns in growing cultures and by mass balance calculations. Enzyme activities of the pentose phosphate pathway and the Embden-Meyerhof-Parnas pathway were sufficiently high to account for in vivo xylose fermentation to pyruvate via a combination of these two pathways. Pyruvate was mainly oxidized to acetyl-CoA, CO2 and a reduced cofactor (ferrodoxin). Part of the pyruvate was converted to acetyl-CoA and formate by means of a pyruvate-formate lyase. Acetyl-CoA was either converted to acetate by a combined action of phophotransacetylase and acetate kinase or reduced to ethanol by an acetaldehyde dehydrogenase and an ethanol dehydrogenase. The latter two enzymes displayed both a NADH- and a NADPH-linked activity. Cofactor regeneration proceeded via a reduction of intermediates of the metabolism (i.e. acetyl-CoA and acetaldehyde) and via proton reduction. According to the deduced pathway about 2.5 mol ATP are generated per mol of xylose degraded.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00307774
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  • 4
    Electronic Resource
    Electronic Resource
    Enzyme profiles of Thiobacillus versutus after aerobic and denitrifying growth: Regulation of isocitrate lyase (1987)
    Springer
    Archives of microbiology 147 (1987), S. 30-36 
    Details
    ISSN: 1432-072X
    Keywords: Thiobacillus versutus ; TCA cycle ; Glyoxylate cycle ; Acetate assimilation ; Aerobiosis ; Denitrification
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The specific activities of the tricarboxylic acid (TCA) cycle enzymes in Thiobacillus versutus were invariably lower after aerobic growth as compared to denitrifying growth in acetate- or succinate-limited chemostat cultures. Of the glyoxylate cycle enzymes, isocitrate lyase (ICL) activity was nil during aerobic and 76 nmol·min-1·mg-1 protein during denitrifying growth on acetate whereas malate synthase (MS) did not change. In succinate-grown cells ICL was always near nil. The change in ICL and MS was followed after pulse additions of acetate and nitrate to an aerobic acetate-limited chemostat culture made anaerobic prior to the first pulse. ICL remained nil during denitrifying growth after the first pulse but increased to 47 and 81 nmol ·min-1·mg-1 protein after the second and third pulse, respectively. MS remained unaltered. The appearance of ICL was dependent upon de novo protein synthesis. During transition in a steady state culture on acetate from oxygen to nitrate as terminal electron acceptor, denitrifying growth started after 0.6 volume replacements. The resumption of growth was concomitant with an increase in TCA cycle enzyme activities. ICL was observed only after two volume replacements. During the reverse transition, ICL disappeared at a rate twice the dilution rate. SDS polyacrylamide gelectrophoresis of cell-free extracts containing ICL showed a major protein band with a Rf value identical to purified ICL and a mol·wt. of 60,000. ICL from T. versutus was inhibited by 1.5 mM itaconate but not by 10 mM phosphoenolpyruvate. Its activity was dependent upon the presence of Mg2+ and cysteine.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00492901
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  • 5
    Electronic Resource
    Electronic Resource
    ATP production from polyphosphate in Acinetobacter strain 210A (1987)
    Springer
    Archives of microbiology 148 (1987), S. 14-19 
    Details
    ISSN: 1432-072X
    Keywords: Polyphosphate: AMP phosphotransferase ; Adenylate kinase ; Energy reserve ; ATP regeneration ; AMP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In cell-free extracts of Acinetobacter strain 210A polyphosphate: AMP phosphotransferase and adenylate kinase activity was measured. Polyphosphate glucokinase and polyphosphate dependent NAD kinase were not detected. The specific activity of polyphosphate: AMP phosphotransferase was found to be 43 nmol · min-1 · mg-1 protein in presence of 1 mmol · l-1 AMP. The adenylate kinase reaction had an equilibrium constant ([ATP] [AMP] [ADP]-2) of 0.7, an activity of 54 nmol · min-1 · mg-1 protein, and was almost completely inhibited by 0.3 mM P1,P5-di(adenosine-5′)-pentaphosphate. ATP was formed through the combined action of polyphosphate: AMP phosphotransferase and adenylate kinase in cell-free extracts from bacterial polyphosphate and from chemically prepared polyphosphate (Graham's salt). A spectrophotometric method for the continuous monitoring of polyphosphate: AMP phosphotransferase is also presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429640
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  • 6
    Electronic Resource
    Electronic Resource
    Physiology of a Methanobacterium strain AZ (1977)
    Springer
    Archives of microbiology 111 (1977), S. 199-205 
    Details
    ISSN: 1432-072X
    Keywords: Methanobacterium strain AZ ; New isolate ; Oxygen effect ; Characterization ; Physiology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A methanogenic bacterium using H2 and CO2 as sole energy and carbon source has been isolated in pure culture from digested sludge. Its colonies on mineral agar are translucent, convex, circular with entire margins and yellow to brownish in colour. Cells are gram-positive, non motile and appear as straight cods, normally about 3 μm long. A marked pleomorphism depending on the media was observed. The organism is chemolithoheterotrophic, has a pH optimum of 7.0 and an optimal temperature for growth of 33–40°C; no growth occurs above 45°C. The generation time at optimal conditions is less than 5 h. Cysteine must be supplied in the growth medium. It can act as sole sulfur source. The addition of sulfide accelerates the growth at an optimum concentration of 10-4 to 10-5 molar. A growth factor, not identical with SH-coenzyme M, occurring in anaerobic sewage sludge and yeast extract shows a stimulatory effect. 7.0–8.2% of the total carbon dioxide uptake is assimilated and 11.2% of the energy obtained from the reduction of carbon dioxide to methane is refound in the caloric value of the biomass. 0.01 ppm of dissolved oxygen completely inhibits growth and methane production. However, the bacteria do not loose their viability when exposed to high oxygen concentrations. Further informations are needed before this organism (DSM 744) is specifically identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00549357
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  • 7
    Electronic Resource
    Electronic Resource
    Regulation of polyphosphate metabolism in Acinetobacter strain 210A grown in carbon- and phosphate-limited continuous cultures (1992)
    Springer
    Archives of microbiology 158 (1992), S. 139-144 
    Details
    ISSN: 1432-072X
    Keywords: Acinetobacter ; Polyphosphate ; Poly-β-hydroxybutyric acid ; Continuous culture ; Phosphate limitation ; Polyphosphate: AMP phosphotransferase ; Polyphosphatase ; Alkaline phosphatase ; Phosphate uptake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The response of Acinetobacter strain 210A to low phosphate concentrations was investigated in P- or C-limited chemostat cultures. The organism accumulated poly-β-hydroxybutyric acid under P-deprivation, at phosphate concentrations ranging from 0.1 to 0.7 mM. The amount of biomass was proportional to the phosphate concentration in the medium and no polyphosphate was formed. When shifting a culture from P- to C-limitation phosphate was accumulated as polyphosphate. No poly-β-hydroxybutyrate could be detected in these cells. The amount of polyphosphate in the cell showed a hysteresis. When cultures were shifted from low to high phosphate concentrations, polyphosphate reached a maximum of about 60 mg P per gram of dry weight at about 3 times excess phosphate (ca. 2.5 mM Pi). It decreased to 45 mg P per gram dry weight at approximately 5 times the phosphate needed for growth (ca. 3.5 mM Pi). In the reverse case (high to low) polyphosphate did never exceed 45 mg P per gram dry weight. The specific activities of alkaline phosphatase and the phosphate uptake system were induced at residual Pi concentrations below the detection limit (〈10 μM). The specific uptake rate followed also a hysteresis. The specific activities of polyphosphatase and polyphosphate: AMP phosphotransferase increased when polyphosphate formation was possible.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00245217
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  • 8
    Electronic Resource
    Electronic Resource
    Radiation-induced hot spots in superconducting Sn strips
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 193 (1992), S. 264-272 
    Details
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/0921-4534(92)90727-T
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  • 9
    Electronic Resource
    Electronic Resource
    On the performance of superconducting tunneling junctions as detectors for nonthermal phonons in single crystalline silicon
    Amsterdam : Elsevier
    Physica B: Physics of Condensed Matter 169 (1991), S. 447-448 
    Details
    ISSN: 0921-4526
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0921-4526(91)90269-K
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  • 10
    Electronic Resource
    Electronic Resource
    An experimental study of the EO, E2 and E4 charge moments of ^1^6^1Dy using muonic atoms
    Amsterdam : Elsevier
    Nuclear Physics, Section A 292 (1977), S. 487-505 
    Details
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(77)90632-7
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