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  • 1995-1999  (1)
  • 1985-1989  (5)
  • 1
    Electronic Resource
    Electronic Resource
    Honey bees choosing a home prefer previously occupied cavities (1985)
    Springer
    Insectes sociaux 32 (1985), S. 217-220 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Honigbienen (Apis mellifera) bevorzugen ehemals bewohnte Brutkästen bei der Wahl zwischen noch nie benutzten und vormals von Bienen bewohnten Brutkästen mit Wabe (p=0.032). Dieses Verhalten ist möglicherweise adaptiv in Bezug auf Energieersparnis, verglichen mit einer neuen Kolonie. Die Wahl eines vormals bewohnten Brutkästens könnte jedoch den einfachen Grund haben, daß bereits benutzte Brükästen mit Wabe für die Bienen auffälliger und leichter zu finden sind.
    Notes: Summary Given a choice between nesting in boxes which had been previously occupied by bees, containing comb, and boxes never occupied, honey bees (Apis mellifera) show a significant (p=0.032) preference for the previously occupied cavities. This behavior may be adaptive in terms of energetic savings to a new colony, or cavities with comb may simply be more conspicous.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02224236
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Collisional transport treatment of surface plasma structures (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 1911-1925 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Calculations are shown of the structure of plasmas in equilibrium with solid surfaces that reemit incident plasma ions as relatively cold neutral gas. A numerical transport model that includes a Fokker–Planck treatment of ion–ion collisions obtains the distribution function for ions in a phase space of one spatial coordinate and two velocities. This is done self-consistently with an electrostatic potential, a Maxwell–Boltzmann description of electrons, and electron impact ionization of the reemited neutrals. Solutions are obtained from a higher temperature kinetic regime where Coulomb collisions are nearly negligible to a lower temperature regime where plasma behavior is approximately fluidlike. A result of these calculations is the resolution of an ambiguity posed by previous kinetic regime calculations that omitted ion–ion collisions and obtained a family of solutions for each set of physical parameters [Phys. Rev. Lett. 49, 650 (1982); Phys. Fluids B 1, 448 (1989)]. The physically correct solution for semi-infinite surface plasmas is shown to be the member of each family that maximizes the ion thermal conduction to the surface and the magnitude of a maximum in the electrostatic potential that is found in these and the previous calculations. Further results are in agreement at lower temperatures with solutions obtained from a fluid model and the identification of the correct boundary condition on normal flow velocity to be used in fluid models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.858923
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Surface plasma structures in the kinetic regime (1989)
    New York, NY : American Institute of Physics (AIP)
    Physics of Fluids 1 (1989), S. 448-467 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A numerical study is done of a plasma in contact with a solid surface that reemits some fraction of the incident plasma as neutral gas. The calculation uses a steady-state, kinetic treatment of the transport equations in one space dimension and one or two velocity dimensions to determine self-consistently the distribution functions of the interacting species and the electrostatic potential. The dominant phenomena are the ionization of the neutral gas and the acceleration of the resulting ions away from a potential maximum that is predicted to form in the ionization region. Other effects involved are a Debye sheath structure between the solid surface and the potential maximum, and collisional trapping and untrapping of electrons in the well represented by the potential maximum. Results are presented from a nondimensional model with a monatomic returning neutral species, and for diatomic molecular deuterium returning from the surface. For each set of physical parameters chosen, a one parameter family of solutions is obtained. A hypothesis is presented for the choice from this family of solutions that would be found experimentally.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.859160
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Self-consistent growth rate of the Rayleigh–Taylor instability in an ablatively accelerating plasma (1985)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 28 (1985), S. 3676-3682 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The linear stability of an ablating plasma is investigated as an eigenvalue problem by assuming the plasma to be at the stationary state. For various structures of the ablating plasma, the growth rate is found to be expressed well in the form γ=α(kg)1/2 −βkVa, where α=0.9, β(approximately-equal-to)3–4, and Va is the flow velocity across the ablation front, and is found to agree well with recent two-dimensional simulations in a classical transport regime. Short-wavelength lasers inducing enhanced mass ablation are suggested to be advantageous to stable implosion because of the ablative stabilization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.865099
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Field evaluation of starter N and delayed inoculation ofLespedeza cuneata grown in minesoil (1988)
    Springer
    Plant and soil 109 (1988), S. 109-113 
    Details
    ISSN: 1573-5036
    Keywords: inoculation method ; nitrogen fixation ; reclamation ; Rhizobium ; sericea lespedeza ; surface mining
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract A field study was conducted on freshly reclaimed surface-mined area to determine response of sericea lespedeza (Lespedeza cuneata [Dumont] G. Don.) to delayed rhizobial inoculation. Soybeans (Glycine max L.) were used as a control legume. Plots were inoculated with spray applications of rhizobial suspensions at seeding, cotyledon stage or second trifoliate leaf stage, or not inoculated. Starter N at 0, 10 or 20 kg ha−1 was applied preplant in a factorial arrangement with inoculation timings.G. max. was grown for 92 days andL. cuneata for 121 days. Starter N increased plant growth and total shoot N in both species. However, % shoot N was found to increase only inL. cuneata. Delaying inoculation had no significant effect upon total shoot N or % shoot N accumulation inL. cuneata. Inoculation ofG. max at planting produced greater plant growth and N accumulation than delayed inoculation treatments. Application of inoculum as a surface spray appeared to be an effective method for delayed inoculation as evidenced by nodule formation. Lack of increased plant growth, regardless of time of inoculation, suggests that delayed inoculation does not improve establishment and growth ofL. cuneata in minesoil.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02197587
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  • 6
    Electronic Resource
    Electronic Resource
    Media for the detection of Bacillus larvae spores in honey (1996)
    Berlin : Wiley-Blackwell
    Acta Biotechnologica 16 (1996), S. 57-64 
    Details
    ISSN: 0138-4988
    Keywords: Life Sciences ; Life Sciences (general)
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Bacillus larvae, the causative agent of American foulbrood in honey bees completes its life cycle of germination, outgrowth and sporulation in young honey bee larvae by killing them and often bringing about the destruction of the entire hive. While B. larvae germinates and outgrows on complex organic media in vitro, the literature suggests, for reasons that are not at all clear, that a relatively large number of spores of B. larvae are required to yield each visible colony (colony forming units, CFU) on media. Various researchers have reported that from 16 to 3,000 or more spores of B. larvae are required to yield a single colony on an agar plate. HANSEN in Denmark designed a useful method of spreading approximately 80 mg of honey directly on the surface of a PETRI plate containing “J” agar medium to determine if B. larvae spores are present in the honey. In the present study, selected media were tested for the ability to recover B. larvae spores in honeys in the form of visible colonies (CFU) using HANSEN's strek method. A modification of a medium (TMYGP) developed by DINGMAN and STAHLY, (T-HCL-YGP agar), recovered considerably more viable B. larvae spores in the form of visible colonies (CFU) than HANSEN's “J” medium. When “J” medium was fortified with 0.1% sodium pyruvate, it was comparable to modified T-HCL-YGP medium in its recovery of B. larvae spores. Brain heart infusion agar (BHIA) with the addition of thiamine recovered more spores in the form of viable colonies than did “J” medium but it was not as efficient as T-HCL-YGP medium. Serial dilution from 100 to 10,000 times of weighed samples of honey with deionized water led to higher spore counts (CFU per g honey) than that indicated by undiluted honeys plated at 80 mg levels directly onto the surface of media by the HANSEN procedure.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/abio.370160108
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