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  • 1
    Electronic Resource
    Electronic Resource
    Lorentz invariance and the equivalence of metric, spinor, and frame field concomitants (1987)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 28 (1987), S. 1840-1843 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Any theory constructed out of the metric tensor and its derivatives can also be regarded as a theory constructed out of a frame field and its derivatives. In general, the converse is not true. It is shown that with the additional assumption that the theories are Lorentz invariant the converse is true. Theories involving the metric spinor and its derivatives are then included in this equivalence and the various interrelationships are studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.527444
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  • 2
    Electronic Resource
    Electronic Resource
    Electrochemistry of thioxanthene, thioxanthone and related compounds in acetonitrile - Substituent effects and correlation of electrochemical behavior with molecular orbital calculations
    Amsterdam : Elsevier
    Journal of Electroanalytical Chemistry 210 (1986), S. 45-67 
    Details
    ISSN: 0022-0728
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-0728(86)90314-1
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  • 3
    Electronic Resource
    Electronic Resource
    Optimization of Extracellular Lipase Activity from Pseudomonas fluorescens using a Super-Simplex Optimization Program (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 51 (1986), S. 0 
    Details
    ISSN: 1750-3841
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method of determining extracellular lipase activity from Pseudomonas fluorescens based on the hydrolysis of β-naphthyl caprylate has been developed. Optimum activity was determined as a function of temperature, pH, β-naphthyl caprylate and sodium taurocholate concentrations using a stepwise super-simplex optimization procedure. Optimization was performed with a Sharp PC-1500A computer and appropriate ranges for each experimental factor were determined by prior experimentation. A maximum A540 response of 0.38 units was obtained at 50°C, pH 7.2, 0.1 mM β-naphthyl caprylate and 17.6 mM sodium taurocholate. This response was 61% better than a previous response obtained by the one-factor-at-a-time method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2621.1986.tb13903.x
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  • 4
    Electronic Resource
    Electronic Resource
    ASSESSMENT OF A WASH TREATMENT WITH WARM CHLORINATED WATER TO EXTEND THE SHELF–LIFE OF READY–TO–USE LETTUCE (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food quality 26 (2003), S. 0 
    Details
    ISSN: 1745-4557
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The influence of a warm chlorine wash on the microbiological quality and shelf–life of ready–to–use (RTU) shredded iceberg lettuce was examined using the electronic nose (EN) and culture methods. There was a significant difference in psychrotrophic counts (P〈0.0001) of warm chlorine (100 ppm) washed lettuce at 47 ± 2C for 30 s, 60 s, and 180 s exposure from days 1 to 10 of storage at 4C compared with cold chlorine (100 ppm) washed lettuce at 4 ± 1C for 30 s. There were no significant differences in psychrotrophic counts between wash treatments of 30 s and 60 s during 17 days storage (P 〈 0.05). The EN detected initially high levels of volatiles in this group compared with cold treatment. Lettuce samples treated with cold or warm chlorine wash water showed no differences in the presence/absence or levels of Listeria monocytogenes. The warm chlorine washed lettuce samples were rated acceptable upon sensory evaluation up to day 14.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4557.2003.tb00238.x
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  • 5
    Electronic Resource
    Electronic Resource
    Dimethyl 9-thioxanthenylidenemalonate, C18H14O4S (1984)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 1710-1712 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270184009240
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  • 6
    Electronic Resource
    Electronic Resource
    Metabolism of fructo-oligosaccharides by Bifidobacterium spp. (1989)
    Springer
    Applied microbiology and biotechnology 31 (1989), S. 537-541 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary Bifidobacterium adolescentis ATCC 15703, B. longum ATCC 15707, and B. thermophilum ATCC 25525 were examined for the ability to grow with fructo-oligosaccharides (FOS) as carbohydrate sources. The three species produced cell-associated β-fructosidases (inulinases) capable of hydrolysing FOS. Maximum activity was obtained with short-chain FOS with degrees of polymerization (DP) of between three and five (neosugars). The B. thermophilum inulinase was induced by inulin, a long-chain FOS with DP=35, while the enzymes from the other two strains were constitutive. Production of inulinase by all three strains was regulated by catabolite repression. Inulinase activity of the three Bifidobacterium spp. was similar when grown with 0.5% inulin as the carbohydrate source; however, B. thermophilum grew much more rapidly. All three strains utilized crude Jerusalem artichoke flour (JAF) as a carbohydrate source, suggesting that JAF might have commercial application as a food or feed additive to stimulate bifidobacteria in the gut.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00270790
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  • 7
    Electronic Resource
    Electronic Resource
    Influence of iron(III) and pyoverdine on extracellular proteinase and lipase production by Pseudomonas fluorescens B52 (1987)
    Springer
    Archives of microbiology 147 (1987), S. 225-230 
    Details
    ISSN: 1432-072X
    Keywords: Pseudomonas fluorescens ; Psychrotroph ; Proteinase ; Lipase ; Pyoverdine ; Iron ; Repression of synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Factors associated with the production of extracellular lipase and proteinase by Pseudomonas fluorescens B52 during the late-log, early-stationary phase of grown were examined. Active lipase production by resting cell suspensions was observed when cells were harvested during the log phase (A600 of 0.3–0.9) Resting suspensions of younger cells (A600〈0.1) synthesized lipase after a significant lag. Addition of cells of the proteinase-and lipasedeficient mutant P. fluorescens RM14 to B52 cells at low density resulted in stimulation of lipase and proteinase production. Similar results were found using cell-free culture fluid of RM14. Gel filtration on Biogel P2 revealed that the stimulatory factor co-chromatographed with the iron(III) siderophore, pyoverdine. Partially purified pyoverdine stimulated enzyme synthesis at a concentration of 6 μM while having no effect on activity of preformed enzyme. Production of pyoverdine and extracellular enzymes was also stimulated by transferrin, a strong iron(III) binding protein. Growth of B52 in deferrated media was limited to 27% of that found with untreated media. Maximum pyoverdine, proteinase and lipase synthesis was obtained at a final iron(III) concentration of 5.75 μM. Growth was maximal in 8.75 μM iron(III) while synthesis of pyoverdine, proteinase and lipase was reduced to 3.6, 6.6 and 30% respectively in 23.75 μM iron(III). Lipase activity in cell-free culture fluid was slightly inhibited by the addition of up to 400 μM iron(III) while proteinase activity was unaffected. In dilute cell suspensions, lipase synthesis was more sensitive to iron(III) than was proteinase (50% inhibition at 1.6 μM and a maximum of 40% inhibition at 5.0 μM, respectively). In the case of lipase, added pyoverdine was able to partially protect enzyme production from the effects of iron(III). The results are consistent with a role for iron(III) in the regulation of extracellular lipase and proteinase synthesis by P. fluorescens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00463479
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  • 8
    Electronic Resource
    Electronic Resource
    Characterization of a pyoverdine-deficient mutant of Pseudomonas fluorescens impaired in the secretion of extracellular lipase (1988)
    Springer
    Archives of microbiology 150 (1988), S. 523-528 
    Details
    ISSN: 1432-072X
    Keywords: Pseudomonas fluorescens ; Proteinase ; Lipase ; Pyoverdine-deficient mutant ; Iron ; Repression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract A mutant of Pseudomonas fluorescens strain B52 deficient in the synthesis of the fluorescent pigment, pyoverdine, was isolated. Absence of pyoverdine and other siderophores was confirmed by gel filtration, a specific siderophore assay, and inhibition studies with the iron chelator EDDA. Both parent and mutant synthesized additional outer membrane proteins in response to iron-limitation. Mutant cells cultured in the absence of iron(III) accumulated 55Fe-labeled pyoverdine. The mutant produced extracellular proteinase normally on various media, but was deficient in lipase secretion. Growth of the mutant with partially-purified pyoverdine resulted in a 2.5-fold stimulation of lipase secretion. The mutant grew poorly in deferrated medium; however, the addition of iron(III) stimulated growth. Proteinase secretion in deferrated medium was stimulated over a narrow range of iron(III) concentration, while lipase secretion was only slightly affected. The data suggest that separate regulatory mechanisms exist for the control of proteinase and lipase secretion by iron(III).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00408243
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  • 9
    Electronic Resource
    Electronic Resource
    MKES Tools: A microbial kinetics expert system for developing and assessing food production systems (1993)
    Springer
    Journal of industrial microbiology and biotechnology 12 (1993), S. 256-262 
    Details
    ISSN: 1476-5535
    Keywords: Listeria ; Salmonella ; Shigella ; Aeromonas ; Staphylococcus ; Escherichia coli ; Bacillus cereus ; Clostridium botulinum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Summary MKES Tools is a microbial kinetics expert system for developing food production systems and assessing product safety. The specific information required as input are: (1) a flowchart of the production system, (2) the factors affecting the survival and growth of food-borne pathogens and (3) the ranges of variation for each factor's parameters. With this information, MKES Tools simulates the growth and survival of pathogenic microorganisms when subjected to many different factor/parameter situations. The responses obtained are then used to estimate the significance of each factor's parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01584199
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  • 10
    Electronic Resource
    Electronic Resource
    A connection approach to the Einstein-Maxwell field equations (1979)
    Springer
    General relativity and gravitation 10 (1979), S. 467-488 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Scalar densities which are concomitants of the metric tensor, a symmetric affine connection and its first derivative, and the derivative of a vector field are examined. Rather simple demands are imposed on the corresponding Euler-Lagrange expressions. It is found that the associated field equations reduce essentially to the Einstein-Maxwell field equations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00759283
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