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  • 1
    Electronic Resource
    Electronic Resource
    Identification of bacterial pathogens by laser excited fluorescence (1985)
    s.l. : American Chemical Society
    Analytical chemistry 57 (1985), S. 1669-1673 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00285a035
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  • 2
    Electronic Resource
    Electronic Resource
    Interaction between a peat carrier and bacterial seed treatments evaluated for biological control of the take-all diseases of wheat (Triticum aestivum L.) (1989)
    Springer
    Biology and fertility of soils 8 (1989), S. 166-171 
    Details
    ISSN: 1432-0789
    Keywords: Pseudomonas ; Disease predisposition ; Take-all ; Gaeumannomyces ; Seed treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary Field plots were established in Indiana, Oregon, and Montana to evaluate the potential for biological control of various strains of bacteria as seed treatments to reduce the severity of take-all root, crown, and foot rot of wheat. The bacteria were grown in liquid broth Cas-amino acid broth media, mixed with finely ground peat, and applied to seed with methyl cellulose as a glue just before planting in field soils conducive for severe take-all. Autoclave-sterilized peat (minus bacteria) seed treatments increased take-all, immobilized Mn, and reduced plant vigor and grain yields. These effects were intensified when the pH of the natural peat was adjusted from 5.2 to 7.0 with CaCO3. The ability of the bacterial strains to counteract this peat-induced predisposition to take-all varied, and was influenced by planting site, genetic tolerance of the cultivar, and N treatment. Although the strains differed in their ability to suppress the peat-induced take-all, none of the isolates fully nullified the deleterious effects of the peat carrier. It is clear from this study that the carrier used with potential biological-contol agents may have a greater influence on disease than the biological agent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257761
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  • 3
    Electronic Resource
    Electronic Resource
    Microscopic theory of magnetic excitations in ferromagnets with random anisotropy axes (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 64 (1988), S. 5627-5629 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We present a microscopic theory of the harmonic magnetic excitations in ferromagnets with random anisotropy axes. The theory is analogous to the theory of excitations in spin glasses developed by Walker and Walstedt, with the difference that the disorder arises from the anisotropy rather than the exchange interaction. We report the results of numerical calculations of magnon density of states and the ferromagnetic resonance frequency for a model system where the spins occupy sites on a fcc lattice. The exchange interaction is between nearest neighbors, and the anisotropy axis varies randomly from site to site with no correlation between different sites. Data are obtained with a range of values of the ratio of the anisotropy to the exchange interaction in both the zero-field and high-field limits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.342303
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  • 4
    Electronic Resource
    Electronic Resource
    Identification of immobilized bacteria by aminopeptidase profiling (1989)
    s.l. : American Chemical Society
    Analytical chemistry 61 (1989), S. 1656-1660 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac00190a011
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  • 5
    Electronic Resource
    Electronic Resource
    Low-temperature spin correlations and spin dynamics in diluted magnetic semiconductors (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3415-3417 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Neutron scattering measurements of static and dynamic spin correlations in the semimagnetic semiconductor Cd0.35Mn0.65Te are reported and compared to computer simulations for a dilute Heisenberg fcc antiferromagnet that is the model analog of Cd1−xMnxTe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335061
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  • 6
    Electronic Resource
    Electronic Resource
    Spin dynamics in Zn1−xMnxTe (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3297-3299 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: First results of inelastic neutron scattering studies of quasiharmonic magnons in Zn1−xMnxTe are reported. Measurements carried out on two single-crystal samples with x=0.65 and x=0.41 at T=4.2–5.0 K revealed broad excitation modes, which were in excellent agreement with the results of theoretical modelling. Results for x=0.65 yield JNN=(7.9±0.2) K which is the first determination of the nearest-neighbor exchange constant in Zn1−xMnxTe in this x region. Data taken at higher temperatures showed only weak renormalization of the energy spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340816
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  • 7
    Electronic Resource
    Electronic Resource
    Relaxation of a nuclear spin interacting with a dilute gas of π-solitons in the strong collision limit (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 3349-3350 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We calculate the longitudinal relaxation time of a nuclear spin interacting with a dilute gas of π-solitons in a quasi-one-dimensional magnetic chain. The calculation applies to the strong collision limit and thus is appropriate for characterizing the relaxation of the nuclear spins of the magnetic ions. The relaxation rate is proportional to the soliton density for all values of the collision rate. Results are compared with the predictions of the weak collision model, which is applicable to the nuclear spins of the nonmagnetic ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.335092
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  • 8
    Electronic Resource
    Electronic Resource
    Instabilities of spin waves in parallel-pumped easy plane ferromagnets (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 4151-4153 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: By applying the S-theory formalism of Zakharov et al. to a microscopic hamiltonian with uniaxial easy plane anisotropy, we arrive at a set of equations for the system that describe the spin waves and their mutual interactions. The parameters in the theory are related to the various interaction constants of the microscopic hamiltonian. Numerical studies of this system of equations indicate that the stationary states are ones where all spin-wave pair correlation functions have the same phase. The phenomenon of phase locking is universal, independent of the mode of approach to equilibrium. It is found that there is no dependence on the number of modes (up to 100) for the above behavior. This, together with the form of the equations, indicates that a similar result should hold for a macroscopic number of modes. Results for the stationary magnon population are presented. In the phase-locked regime, the approach to a stationary state is governed by a pair of coupled first-order differential equations. Linearizing these equations about the stationary points, we find that the approach to equilibrium involves purely exponential decay just above threshold, and, at higher power levels, we have damped oscillatory decay.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340523
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  • 9
    Electronic Resource
    Electronic Resource
    Methyl bromide inhibits ripening and ethylene production in tomato (lycopersicon esculentum mill.) fruit (1986)
    Springer
    Journal of plant growth regulation 5 (1986), S. 29-35 
    Details
    ISSN: 1435-8107
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Tomato fruit ripening and ethylene production were inhibited following treatment with methyl bromide (MB). Methyl bromide significantly delayed ripening initiation in mature-green (MG) fruit and retarded the rate of ripening of turning (T) fruit as measured by color development and flesh softening. Treatment with MB caused an initial transient burst of ethylene production, but the subsequent ripening-associated increase in ethylene was delayed. Ethylene treatment partially overcame MB inhibition in MG fruit but had no affect on T fruit. The inhibition of ethylene production by MB appears to be due to lack of formation of 1-aminocycloprone-1-carboxylic acid (ACC) in MG fruit, whereas in T fruit lack of conversion of ACC to ethylene is indicated. A key feature of MB inhibition of ripening in tomato appears to be reduced sensitivity to ethylene.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02027384
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  • 10
    Electronic Resource
    Electronic Resource
    Ammonium assimilation in different plant species as affected by nitrogen form and pH control in solution culture (1989)
    Springer
    Nutrient cycling in agroecosystems 21 (1989), S. 1-6 
    Details
    ISSN: 1573-0867
    Keywords: Corn ; tomato ; rice ; nitrate ; glutamine synthetase ; ammonium assimilation ; glutamate dehydrogenase ; asparagine synthetase ; pH
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Plant growth, ammonium assimilating enzyme activity, and free ammonium in tissue of different plant species were compared in the presence of either NO3 or NH4 forms of N at two pH levels in solution culture. Tomato and corn growth, but not rice growth, was reduced when NH4 was the sole form of N in the solution culture. Ammonium toxicity was more severe at low than higher pH. Glutamate dehydrogenase activity in roots of the three plant species was higher in the presence of NH4 than NO3 nitrogen. Asparagine synthetase activity was very low in roots of the three species regardless of the N form supplied. Glutamine synthetase activity in roots and shoots of rice was much higher than in tissue of tomato and corn. Glutamine synthetase activity in rice increased sharply in the presence of NH4, and much less free NH4 was detected in green tissues compared to tomato plants. Glutamine synthetase appears to be a key factor to detoxify NH4 in the leaves of rice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01054728
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