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  • 1
    Digitale Medien
    Digitale Medien
    Molecular cloning of thentrA gene of the broad host-rangeRhizobium sp. NGR234, and phenotypes of a site-directed mutant (1989)
    Springer
    Molecular genetics and genomics 217 (1989), S. 528-532 
    Details
    ISSN: 1617-4623
    Schlagwort(e): Sigma factor ; Interposon ; Symbiosis ; lacZ-fusions
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary The clonedntrA (rpoN) gene andntrA mutants ofRhizobium meliloti were used to isolate the homologous gene from the broad-host rangeRhizobium sp. NGR234 by hybridization and interspecies complementation. The NGR234 locus was analyzed by deletion and insertional mutagenesis. A site-directedntrA mutant, NGR234rn1, was made with an interposon, GmI, and its phenotype was examined ex planta and in symbiosis. NGR234rn1 formed Fix− nodules on six genera tested from among its legume hosts, including both indeterminate and determinate nodule-type plants. Formation of nodules onMacroptilium was delayed, and expression of anR. meliloti nodABC-lacZ fusion was reduced by the mutant allele.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02464927
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  • 2
    Digitale Medien
    Digitale Medien
    Transcriptional regulation of the iron-responsive sigma factor gene pbrA (1996)
    Springer
    Molecular genetics and genomics 250 (1996), S. 50-58 
    Details
    ISSN: 1617-4623
    Schlagwort(e): Key words Iron regulation ; Sigma factor ; Fur ; Pseudomonas ; Siderophore
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract  In response to the intracellular iron concentration Pseudomonas fluorescens M114 coordinately regulates the production of pseudobactin M114, its cognate receptor PbuA, and a casein protease. Transcriptional initiation of this coordinate iron-stress response requires the sigma factor PbrA. PbrA is a member of the ECF (Extracytoplasmic function) subgroup of the σ70 family of eubacterial RNA polymerase sigma factors. Regulatory studies of the pbrA gene utilising promoter-lacZ transcriptional fusions demonstrate that expression of pbrA dictates the cellular response to iron. pbrA is transcribed in all phases of iron-limited growth but maximally at late-logarithmic to stationary phase. pbrA expression is independent of autoregulatory control but is strictly repressed in iron-rich conditions in a Fur-dependent fashion. Constitutive expression of pbrA from an inducible tac promoter permits the induction of PbrA-dependent transcription and pseudobactin M114 biosynthesis in high-iron conditions. A PbrA consensus sequence was derived from significant DNA sequence homologies observed within the “−25 bp” and “−16 bp” regions conserved among all PbrA-dependent promoters. The predicted PbrA target promoter consensus is homologous for the promoter recognition sites for other environmentally responsive ECF sigma factors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02191824
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  • 3
    Digitale Medien
    Digitale Medien
    Transcriptional regulation of the iron-responsive sigma factor genepbrA (1996)
    Springer
    Molecular genetics and genomics 250 (1996), S. 50-58 
    Details
    ISSN: 1617-4623
    Schlagwort(e): Iron regulation ; Sigma factor ; Fur ; Pseudomonas ; Siderophore
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract In response to the intracellular iron concentrationPseudomonas fluorescens M114 coordinately regulates the production of pseudobactin M114, its cognate receptor PbuA, and a casein protease. Transcriptional initiation of this coordinate iron-stress response requires the sigma factor PbrA. PbrA is a member of the ECF (Extracytoplasmicfunction) subgroup of the σ70 family of eubacterial RNA polymerase sigma factors. Regulatory studies of thepbrA gene utilising promoter-lacZ transcriptional fusions demonstrate that expression ofpbrA dictates the cellular response to iron.pbrA is transcribed in all phases of iron-limited growth but maximally at late-logarithmic to stationary phase.pbrA expression is independent of autoregulatory control but is strictly repressed in iron-rich conditions in a Fur-dependent fashion. Constitutive expression ofpbrA from an inducibletac promoter permits the induction of PbrA-dependent transcription and pseudobactin M114 biosynthesis in high-iron conditions. A PbrA consensus sequence was derived from significant DNA sequence homologies observed within the “ − 25 bp” and “ − 16 bp” regions conserved among all PbrA-dependent promoters. The predicted PbrA target promoter consensus is homologous for the promoter recognition sites for other environmentally responsive ECF sigma factors.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02191824
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  • 4
    Digitale Medien
    Digitale Medien
    Studies of drop break-up in liquid-liquid systems in a rotating disc contactor. Part II: Effects of mass transfer and scale-up (1991)
    Weinheim : Wiley-Blackwell
    Chemical Engineering & Technology - CET 14 (1991), S. 178-185 
    Details
    ISSN: 0930-7516
    Schlagwort(e): Chemistry ; Industrial Chemistry and Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: The number fraction of drops of a given size which break up at rotor level in a rotating disc contactor has been observed during mass transfer in either direction to or from solvent or aqueous drops. Critical rotor speeds for a given drop size undergoing mass transfer can be used to find an effective interfacial tension. Using this interfacial tension value, the break-up fractions are correlated within experimental uncertainties in the same manner as for no mass transfer. Drop break-up fractions depend on column size and relevant empirical correlations of the data are presented. The results may be used to estimate the effect of mass transfer on drop size distributions in an RDC.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/ceat.270140305
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  • 5
    Digitale Medien
    Digitale Medien
    Element-selective atomic emission detection for capillary GC of metal-containing compounds (1992)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 15 (1992), S. 669-676 
    Details
    ISSN: 0935-6304
    Schlagwort(e): Selective GC detection of metals ; Atomic emission detection ; Microwave-induced plasma ; Metal-containing compounds ; Metalloporphyrins ; Organomanganese ; Organotitanium ; Chemistry ; Analytical Chemistry and Spectroscopy
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Element-selective GC detection by microwave-induced plasma atomic emission spectroscopy has been used to examine a wide variety of compounds containing metals, non-metals, and metalloids. “Recipes”, or new selective detection schemes for use with the software of the computer-controlled system, have been developed for the selective detection of boron, aluminum, gallium, titanium, vanadium, chromium, manganese, rhenium, palladium, and platinum. Figures of merit including limits of detection, linear dynamic range, and spectral selectivity over carbon have been established for most of these elements. Gas chromatography - atomic emission detection (GC-AED) has been applied to the selective detection of vanadium, nickel, and iron in metalloporphyrins present in crude oil, manganese-selective detection of methylcyclopentadienylmanganese tricarbonyl (MMT) in gasoline, and titanium-selective detection of reaction mixtures containing titanium catalysts or titanium boride molecular precursors.
    Zusätzliches Material: 10 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jhrc.1240151008
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  • 6
    Digitale Medien
    Digitale Medien
    Drag reduction in cocurrent horizontal natural gas-hexane pipe flow (1980)
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 20 (1980), S. 485-492 
    Details
    ISSN: 0032-3888
    Schlagwort(e): Chemistry ; Chemical Engineering
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Drag reduction in two-phase cocurrent horizontal natural gas-hexane pipe flow was studied experimentally. The effects of pipe diameter, gas flow rate, liquid flow rate, and additive concentration were investigated using the Dowell APE drag reducer. In the annular-mist flow regime studied, it was found that drag reduction increased with decreasing gas rate for a given liquid rate, drag reduction decreased with increasing friction velocity and it decreased with decreasing gas-liquid ratio for a given friction velocity. Although the drag reduction decreased rapidly as the liquid-gas ratio approached zero, drag reductions as high as 34 percent were obtained. Attempts to predict two-phase drag reduction were unsuccessful as it was found to depend upon friction velocity, liquid and gas rates, liquid-gas rate ratio, pipe diameter and additive concentration.
    Zusätzliches Material: 17 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/pen.760200708
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  • 7
    Digitale Medien
    Digitale Medien
    Interaction between polybrominated flame retardants and high impact polystyrene (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 60 (1996), S. 715-720 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Mixtures of two crystalline brominated aromatic flame retardants with a surrounding polymer were studied by differential scanning calormetry, dynamic mechanical analysis (DMA), wide angle X-ray scattering, and solid-state NMR spectroscopy. 1,2-Bis(tet-rabromophthalimide)ethane (I) and decabromodiphenyloxide (II) were evaluated in high impact polystyrene (HIPS). Additive I exhibits all the properties of an inert filler. The crystalline structure with respect to the pure material remains unchanged within the polymer. Concerning the HIPS matrix, a slight rise in the melt viscosity and a reduced impact strenth as compared to the base resin was observed. In contrast, additive II is miscible with the HIPS matrix and dissolves completely. This leads to an increase of the glass transition temperature of the polybutadiene phase as revealed by solid-state NMR spectroscopy and DMA. The impact resistance of the HIPS matrix is less affected by additive II than by additive I. No interactions were noted with the PS phase at températures up to the glass transition. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 8
    Digitale Medien
    Digitale Medien
    Australian studies on fire hazard tests for internal linings of buildings (1979)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 3 (1979), S. 202-210 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Notizen: The Australian Standard ‘Test for Early Fire Hazard Properties of Materials’ (AS 1530 Part 3, 1976) has been studied in detail as a method of assessing the fire performance of plastics wall linings under the conditions of early fire development in a room. A particular feature of the standard test is that four parameters characterizing the reaction to fire are measured concurrently. Results from the standard test have been compared to corner-wall burns involving the same parameters as in the standard test. The suitability of these parameters and the ability of the standard test to rank the behaviour of the materials in the same order as indicated by corner-wall burns is discussed. A general relationship between ignition time and flame spread was observed and is discussed as support for the concept of concurrent measurement of different reaction-to-fire parameters under the one test procedure and condition.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810030405
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  • 9
    Digitale Medien
    Digitale Medien
    The early fire behaviour of combustible wall lining materials (1980)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 4 (1980), S. 165-172 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Notizen: The development of the Australian Standard AS 1530 Part 3 ‘Test for Early Fire Hazard Properties of Materials’ from the study of the fire behavior of cellulosic wall linings in simulated room fires has been outlined. Similar studies for assessing a wider range of wall linings are now reported including various plastic facings applied to hardboard. Using similar parameters for ignitability, spread of flame, heat evolved and smoke developed, the behaviors of the linings in the standard test have been compared to the behavior in corner-wall burns. Two methods of ignition were used for the burns; (a) timber cribs; and (b) impressed radiant heat with a pilot flame. The results are discussed in terms of the validity of the standard test as a multi-parameter assessment of materials in a fire hazard situation. The test has been validated for the wider range of wall lining materials.
    Zusätzliches Material: 11 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810040402
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  • 10
    Digitale Medien
    Digitale Medien
    Preliminary results from an examination of house survival in the 16 February 1983 Bushfires in Australia (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    Fire and Materials 11 (1987), S. 49-51 
    Details
    ISSN: 0308-0501
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Architektur, Bauingenieurwesen, Vermessung , Maschinenbau
    Notizen: This paper describes a survey which was undertaken to ascertain those features of house design and construction which were important to the survival of house in the ‘Ash Wednesday Bushfires’ of 16 February 1983. The Otway Ranges are of Victoria was chosen and 1153 house, with varying degrees of damage, were included in the survey. Results of a preliminary analysis of data collected are given, together with observations made concerning the so-called ‘exploding house’ phenomenon, the role of wind and the part that people played in house survival. Evidence for the ways that houses were ignited (i.e. by radiation, flame contact and wind-blown embers) was also gathered. The importance of these ignition modes is discussed and examples given. Preliminary observations on the rebuilding process are also given.
    Zusätzliches Material: 1 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/fam.810110105
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