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  • 1
    Electronic Resource
    Electronic Resource
    Absconding in honeybees (Apis mellifera) in relation to queen status and mode of worker reproduction (1999)
    Springer
    Insectes sociaux 46 (1999), S. 323-326 
    Details
    ISSN: 1420-9098
    Keywords: Key words: Honeybees, absconding, arrhenotoky, thelytoky.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary: We investigated absconding frequency and latency in queenright and queenless honeybee colonies in thelytokous Apis mellifera capensis, arrhenotokous Apis mellifera scutellata and their natural thelytokous hybrids. There was no significant difference in frequency of absconding among any of the queenright colonies. Absconding was significantly greater in thelytokous queenless colonies than in the queenless arrhenotokous ones. Latency to absconding did not differ among the three groups of queenright colonies nor between the queenright and queenless colonies of A.m. capensis and A.m. scutellata. There were significant differences in latency between queenright and queenless hybrids and significant differences in latency among the three groups of queenless colonies. Among queenless colonies, A.m. capensis absconded twice as readily as did A. m. scutellata and the hybrids were intermediate. Afterabsconding events include the fates of the absconding colony as well as nestmates left behind. One group of orphaned nestmates of A. m. capensis amalgamated with another queenright colony. In the case of A. m. scutellata either drones were produced or the residual queenless colony was joined by a queenless thelytokous group, subsequently reared a queen and then absconded. Differences in the rate and degree of ovarial development indicate that queenless thelytokous workers have the physiological capacity for reproduction, a trait that contributes to colony fitness.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000400050152
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  • 2
    Electronic Resource
    Electronic Resource
    Doppler-free intracavity polarization spectroscopy using elliptically polarized light (1979)
    Springer
    Applied physics 20 (1979), S. 247-250 
    Details
    ISSN: 1432-0630
    Keywords: 33 ; 42.65
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The optically induced polarization change was studied in the case of a standing elliptically polarized wave. Using a Zeeman-tuned gas laser at 3.39 μm with an internal methane cell we have demonstrated the influence of the dichroism on the nonlinear absorption signals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00886025
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  • 3
    Electronic Resource
    Electronic Resource
    Excimer laser photolysis of molybdenum hexacarbonyl with buffer gas (1989)
    Springer
    Applied physics 49 (1989), S. 301-305 
    Details
    ISSN: 1432-0649
    Keywords: 82.50 ; 81.15
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the photolysis of molybdenum hexacarbonyl by focused excimer laser radiation. It was found that electronically excited Mo atoms detected in the focus region of a KrF laser are due to a direct two photon absorption transition. The upper limit of the energy for complete dissociation of Mo(CO)6 has been derived from these results. Two photon dissociation in the gas phase should be the dominant process at metal film deposition on substrates positioned perpendicularly and near to the focus. Adding buffer gases to the organometallic vapor particle formation was observed in the whole irradiated gas volume. The analysis of scattered He-Ne laser light yields information about the density and size of these particles. Some conclusions are drawn with respect to structured metal film deposition with high spatial selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00324177
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  • 4
    Electronic Resource
    Electronic Resource
    Slash fire hazard analysis on the Siskiyou National Forest (1982)
    Springer
    Environmental management 6 (1982), S. 517-526 
    Details
    ISSN: 1432-1009
    Keywords: Fuel treatment ; Fuel appraisal ; Decision analysis ; Forest fires
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Potential increase in fire hazard as a result of timber harvesting is a concern of forest managers throughout the United States. Treating fuels can help reduce unacceptable fire hazards. To evaluate alternative fuel treatments, managers need to know their effects on fire hazard. A decision analysis approach to estimating fire hazard in terms of expected burned area was applied to a watershed in the Siskiyou National Forest (Oregon). Three treatment alternatives (do nothing and two levels of yarding unmerchantable material) were evaluated, and the effects of the treatments were projected over a 90-yr period. Initially, the effects of applying a treatment are small. After 50 years of treatment, the most intense alternative can be expected to show almost a 50% reduction in burned area compared to no treatment. The procedure also estimates burned are by fire size and fire intensity classes. Managers may find this useful for estimating expected fire effects associated with a particular fuel treatment regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01868380
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  • 5
    Electronic Resource
    Electronic Resource
    Abels Unmöglichkeitsbeweis im Spiegel der modernen Galoistheorie (1998)
    Springer
    Mathematische Semesterberichte 45 (1998), S. 127-139 
    Details
    ISSN: 0720-728X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s005910050041
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  • 6
    Electronic Resource
    Electronic Resource
    The nucleotide excision repair epistasis group in Neurospora crassa (1990)
    Springer
    Current genetics 18 (1990), S. 207-209 
    Details
    ISSN: 1432-0983
    Keywords: DNA repair ; Pyrimidine dimers ; Epistasis groups ; Neurospora crassa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary DNA repair mutants in eucaryotes are normally assigned to three epistasis groups. Each epistasis group represents a “pathway” for DNA repair. The pathways are commonly designated (1) nucleotide excision repair, (2) recombination repair and (3) mutagenic repair. An excision repair epistasis group has been established in Neurospora and the mutants assigned to this group should be limited in their ability to excise pyrimidine dimers and other bulky lesions from DNA. Using a pyrimidine dimer-specific assay, we have found that all Neurospora crassa mutants assigned to the excision repair epistasis group are capable of removing pyrimidine dimers from the DNA at a rate similar to the wild-type organism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318382
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  • 7
    Electronic Resource
    Electronic Resource
    Production of Aerodynamic Power in Mountain Honeybees (Apis mellifera) (1998)
    Springer
    Naturwissenschaften 85 (1998), S. 389-390 
    Details
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001140050520
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  • 8
    Electronic Resource
    Electronic Resource
    First approximation to a phenology of the honeybees (Apis mellifera) and flora of Africa (1995)
    Springer
    Oecologia 101 (1995), S. 265-273 
    Details
    ISSN: 1432-1939
    Keywords: Phenology ; Flowering ; Honeybees ; Africa
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Peak flowering by the total flora of Africa coincides with or immediately follows peak rainfall. Flowering intensity of the total flora decreases with distance from the equator, but that of the honeybee plant resource base (±2% of total flora) does not. Flowering in the latter is highly synchronous (months 1–5 north of and 9–11 south of the equator). Both total and honeybee flora are completely incongruent with either the biomes or phytochoria of Africa. There is no significant correspondence between honeybee phenology and the total flora but significant correspondence occurs between honeybees and flowering in honeybee plant genera. A logistic regression model reveals that honeybee plant flowering predicts major honeybee colony events with a probability of 0.81 south of the equator and 0.71 for the whole continent. It is postulated that promiscuity in the bee plant genera and honeybees of Africa have contributed to their continental ubiquity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328811
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  • 9
    Electronic Resource
    Electronic Resource
    Lifetime measurements of Rydberg states in the 6snd 1 D 2-series of BaI (1978)
    Springer
    The European physical journal 285 (1978), S. 111-114 
    Details
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have measured the lifetimes of 10 Rydberg states from 6s8d 1 D 2 to 6s 17d 1D2 in the Ba I spectrum by time-resolved recording of the exponential decay of the resonance fluorescence in an atomic beam. The excitation was performed by use of two pulsed dye lasers simultaneously pumped by one nitrogen laser. The lifetime results differ strongly from Coulomb approximation calculations and show deviations from a(n *)3-dependence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01408736
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  • 10
    Electronic Resource
    Electronic Resource
    Lifetime measurements using stepwise excitation by two pulsed dye lasers (1973)
    Springer
    Applied physics 1 (1973), S. 285-286 
    Details
    ISSN: 1432-0630
    Keywords: Dye lasers ; Atomic spectroscopy ; Lifetimes ; Sodium
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The 42D level of sodium was populated in a stepwise excitation process involving two pulsed dye lasers. The lifetime of the 42D level was derived from the decay of the fluorescence intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00889777
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