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  • Rhizobium  (8)
  • NDE  (5)
  • Coleoptera
  • Springer  (15)
  • Annual Reviews
  • Springer Science + Business Media
  • 2000-2004
  • 1980-1984  (15)
  • 1984  (15)
Collection
Keywords
Publisher
  • Springer  (15)
  • Annual Reviews
  • Springer Science + Business Media
Years
  • 2000-2004
  • 1980-1984  (15)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Denitrification of nitrate to nitrogen gas by washed cells ofRhizobium japonicum and by bacteroids fromGlycine max (1984)
    Springer
    Planta 161 (1984), S. 81-85 
    Details
    ISSN: 1432-2048
    Keywords: Bacteroid ; Glycine (bacteroids) ; Denitrification ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Nitrate, nitrite and nitrous oxide were denitrified to N2 gas by washed cells ofRhizobium japonicum CC706 as well as by bacteroids prepared from root nodules ofGlycine max (L.) Merr. (CV. Clark 63). Radiolabelled N2 was produced from either K15NO3 or Na15NO2 by washed cells ofRh. japonicum CC705 grown with either nitrate only (5 mM) or nitrate (5 mM) plus glutamate (10 mM). Nitrogen gas was also produced from N2O. Similar results were obtained with bacteroids ofG. max. The stoichiometry for the utilization of15NO 3 - or15NO 2 - and the produciton of15N2 was 2:1 and for N2O utilization and N2 production it was 1:1. Some of the15N2 gas produced by denitrification of15NO 3 - in bacteroids was recycled via nitrogenase into cell nitrogen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00951463
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrasonic reflection from a stressed interface (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 3-12 
    Details
    ISSN: 1573-4862
    Keywords: Ultrasonic ; stress measurements ; interfacial stress ; NiTi ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract In seeking to develop an NDE technique for verifying the serviceability of NiTi couplers for plumbing unions, it was found that the reflection coefficient for a normally incident ultrasonic wave correlated with the stress level at the NiTi-tubing interface. Current theory pertaining to interface reflection is not complete but, even at present status, there is semiquantitative accord between theoretical predictions and normalized data for reflection coefficient versus stress level. These results are at fixed frequency and with comparable surface roughness. Variation of either frequency or surface roughness further affects the reflection coefficient. Current studies are being pursued to define this effect.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00711095
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  • 3
    Electronic Resource
    Electronic Resource
    Pheromone production by axenically rearedDendroctonus ponderosae andIps paraconfusus (Coleoptera: Scolytidae) (1984)
    Springer
    Journal of chemical ecology 10 (1984), S. 281-290 
    Details
    ISSN: 1573-1561
    Keywords: Dendroctonus ponderosae ; Ips paraconfusus ; Coleoptera ; Scolytidae ; axenic rearing ; monoterpenes ; aggregation pheromones ; trans-verbenol ; exo-brevicomin ; ipsenol ; ipsdienol
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Mountain pine beetles,Dendroctonus ponderosae Hopkins, and California five-spined ips,Ips paraconfusus Lanier, were reared axenically from surface-sterilized eggs on aseptic pine phloem. After 24 hr in host logs, axenip femaleD. ponderosae and maleI. paraconfusus produced the aggregation pheromones,trans-verbenol (D. ponderosae), and ipsenol and ipsdienol (I. paraconfusus). Emergent, axenically reared maleD. ponderosae contained normal amounts of the pheromoneexo-brevicomin. Axenic femaleD. ponderosae treated with juvenile hormone or exposed to vapors of α-pinene, produced the pheromonetrans-verbenol. By 25–35 days after eclosion, axenic females exposed to α-pinene vapors produced over six times as muchtrans-verbenol as wild females, suggesting that while microorganisms in wild females may producetrans-verbenol, they may also inhibit production of the pheromone or use it as a substrate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00987856
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of phosphorus supply on phosphate uptake and alkaline phosphatase activity in Rhizobia (1984)
    Springer
    Archives of microbiology 140 (1984), S. 281-286 
    Details
    ISSN: 1432-072X
    Keywords: Alkaline phosphatase ; Continuous culture ; Glycerol 1-phosphate uptake ; Phosphate exchange ; Phosphate uptake ; Rhizobium ; Snake bean bacteroids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of P nutrition on phosphate uptake and alkaline phosphatase activity was studied in chemostat culture for four rhizobial and three bradyrhizobial species. Phosphate-limited cells took up phosphate 10- to 180-fold faster than phosphate-rich cells. The four fast-growing rhizobial strains contained high levels of alkaline phosphatase activity under P-limited conditions compared to the repressed levels found in P-rich cells; alkaline phosphatase activity could not be detected in three slow-growing rhizobial strains, regardless of their P-status. Glycerol 1-phosphate-uptake in the cowpea Rhizobium NGR234 was derepressed over 50-fold under P-limited conditions, and appeared to be co-regulated with phosphate uptake. The phosphate-uptake system appeared similar in all strains with apparent K m values ranging from 1.6 μM to 6.0 μM phosphate and maximum activities from 17.2 to 126 nmol · min-1 · (mg dry weight of cells)-1. Carbonyl cyanide m-chlorophenyl hydrazone strongly inhibited phosphate uptake in all strains and a number of other metabolic inhibitors also decreased phosphate uptake in the cowpea Rhizobium NGR234. The phosphate uptake system in all strains failed to catalyse exchange of 32P label in preloaded cells or efflux of phosphate. The results suggest a single, repressible, unidirectional and energy-dependent system for the transport of phosphate into rhizobia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454943
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  • 5
    Electronic Resource
    Electronic Resource
    A continuous culture study of the phosphorus nutrition of Rhizobium trifollii WU95, Rhizobium NGR234 and Bradyrhizobium CB756 (1984)
    Springer
    Archives of microbiology 140 (1984), S. 276-280 
    Details
    ISSN: 1432-072X
    Keywords: Alkaline phosphatase ; Continuous culture ; Growth yields ; Phosphate ; Phosphorus nutrition ; Polyphosphate ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract With continuous cultures in a fully defined minimal salts medium steady states were achieved at both limiting and non-limiting concentrations of phosphate in the inflowing medium for Rhizobium trifolii WU95, cowpea Rhizobium NGR234, and Bradyrhizobium CB756. Millimolar growth yields obtained from P-limited cultures varied over 2-fold from 3.2 g dry weight·(mmol P)-1 for WU95 to 5.3 g dry weight·(mmol P)-1 for CB756 and 7.2 g dry weight·(mmol P)-1 for NGR234. For both WU95 and NGR234 growth under P-excess conditions resulted in elevated levels of total biomass P and the storage compound polyphosphate, compared with P-limited cultures. However, P-limited cultures of these two strains still contained significant quantities of polyphosphate. The P-status for CB756 cultures did not affect either total biomass P or polyphosphate levels. Alkaline phosphatase was maximally derepressed in P-limited cultures of WU95 and NGR234. However, in CB756 alkaline phosphatase was not detected at significant levels regardless of its P supply. These data suggest that growth of rhizobia is controlled predominantly by the attainment of a critical internal P level.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454942
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  • 6
    Electronic Resource
    Electronic Resource
    Effect of phosphorus supply on periplasmic protein profiles in Rhizobia (1984)
    Springer
    Archives of microbiology 140 (1984), S. 287-290 
    Details
    ISSN: 1432-072X
    Keywords: Alkaline phosphatase ; Continuous culture ; Periplasmic proteins ; Phosphate uptake ; Phosphorus nutrition ; Rhizobium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Lysozyme/EDTA treatment of four fast-growing rhizobia released repeatable protein profiles after polyacrylamide slab gel electrophoresis. Similar treatment of slow-growing rhizobia failed to release such periplasmic proteins. For the four-fast-growing rhizobia, both P-repressible and P-inducible protein bands occurred. The only P-repressible protein identified was alkaline phosphatase, which showed strain differences in both electrophoretic mobility and activation by Mg2+. The derepression of the P-repressible periplasmic proteins in cowpea Rhizobium NGR234 correlated with derepression of both phosphate and glycerol 1-phosphate uptake.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00454944
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  • 7
    Electronic Resource
    Electronic Resource
    Some computational considerations in eddy-current NDE (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 39-42 
    Details
    ISSN: 1573-4862
    Keywords: Eddy current ; computer analysis ; numerical methods ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Theoretical calculations of eddy-current phenomena often involve the numerical evaluation of various integral expressions. A discussion of some of the possible evaluation methods and of the factors to be considered in choosing a method is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00711099
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  • 8
    Electronic Resource
    Electronic Resource
    The radiographic edge scattering distortion (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 75-88 
    Details
    ISSN: 1573-4862
    Keywords: object scattering ; edge scattering ; knife edge ; neutron radiography ; buildup factor ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract Previously described scattering based edge distortions in optical density scans obtained from a neutron radiographic knife-edge image have been here confirmed using analog Monte Carlo simulation. In an attempt to estimate the effects of additional object scatter on such artifacts, the effect on the edge response of diffusely incident neutrons has been determined both empirically and by Monte Carlo simulation. The diffuse neutron incidence has been found to diminish the relative magnitude of the distortion, offering explanation for the infrequent observation of the corresponding edge scattering halo artifacts. The potential of this edge distortion as a diagnostic indicator of the buildup factor in radiography is suggested and examined.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566399
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  • 9
    Electronic Resource
    Electronic Resource
    Separation and characterization of stress levels and texture in metal sheet and plate: I. Principles and preliminary experiment (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 157-163 
    Details
    ISSN: 1573-4862
    Keywords: Residual Stress ; ultrasonics ; metals ; EMATs ; NDE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract An approach is proposed for obtaining separate measures of stress anisotropy and texture in metal sheet or plate. The approach is based on the propagation characteristics ofSH n modes of ultrasonic waves. Experimental work has established that differences betweenSH 0 modes with orthogonal directions of propagation provide a measure of stress anisotropy that is insensitive to texture, with the restriction that the pseudosymmetry of the polycrystalline matrix of the sheet or plate is orthorhombic or higher. In the present work, it is argued that the differences between elastic constants associated with orthogonal directions of propagation of higher order modes should provide a meaningful measure of texture. The only requirement is that the texture be sufficiently well developed so that the following inequality is obeyed: ∣C′44−C′55∣〉0.002 $$\bar C$$ with $$\bar C$$ =1/2 (C′44+C′55). HereC′44 andC′55 are the effective shear moduli for planes normal to the sheet or plate surface and at right angles to each other. They are measurable by observing the differences between the phase velocities of theSH 0 and theSH n〉0 modes in the principal directions. By using Electromagnetic Acoustic Transducers (EMATs), the phase velocities can be deduced from the frequencies at which an SH mode of fixed wavelength is optimally excited. This approach has the advantage of being independent of specimen geometry and dimensions other than thickness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566221
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  • 10
    Electronic Resource
    Electronic Resource
    The interaction of ultrasound with contacting asperities: Applications to crack closure and fatigue crack growth (1984)
    Springer
    Journal of nondestructive evaluation 4 (1984), S. 203-212 
    Details
    ISSN: 1573-4862
    Keywords: Acoustic diffraction ; acoustic transmission ; asperity contact ; crack closure ; fatigue cracks ; mode conversion ; NDE ; stress intensity factor
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Abstract The partial contact of two rough fatigue crack surfaces leads to transmission, reflection, diffraction, and mode conversion of an acoustic signal at those contacts. This paper reviews recent experimental and theoretical efforts to understand and quantify such contact on actual fatigue cracks in greater detail. It is shown that the size and density of individual contacts, or asperities, can be estimated from acoustic measurements. Furthermore, it is shown that this information is useful to provide the static stress across a partially closed crack as well as the “effective” stress intensity range which activates fatigue crack propagation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00566225
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