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  • Springer  (21)
  • American Association for the Advancement of Science
  • American Association for the Advancement of Science (AAAS)
  • 2000-2004  (14)
  • 1985-1989  (8)
  • 1935-1939  (1)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    Detailed analysis of active mode-locking (1986)
    Springer
    Applied physics 40 (1986), S. 141-146 
    Details
    ISSN: 1432-0649
    Keywords: 42.60
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We extend earlier work on the theory of active mode-locking in a laser with a very long gain recovery time and obtain approximate closed-form solutions. We show how the results can be reduced to the well-known Kuizenga and Siegman formulae in the limit of small modulation depth and large laser bandwidth. We also discuss the physical relevance of the cavity “supermodes” in determining the stability properties of the mode-locked laser. We show that when the modulation depth is too small or the bandwidth too large, different supermodes have similar energies and we argue that under these circumstances, the laser will not be able to sustain mode-locked operation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00697243
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  • 2
    Electronic Resource
    Electronic Resource
    Mode-locking dynamics of synchronously-pumped colour-centre lasers (1988)
    Springer
    Applied physics 47 (1988), S. 349-357 
    Details
    ISSN: 1432-0649
    Keywords: 42.60F
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A theoretical model has been developed for studying the steady-state pulse shaping dynamics of a synchronously-pumped colour-centre laser. A wide range of results is presented detailing effects on the mode-locking process of pump pulse power and width, laser bandwidth, cavity mismatch and, stochastic noise. From the results, we identify conditions which lead to the formation of single and multiple pulses. We show this can be understood on the basis of a simple scaling law between the principal laser parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00716097
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  • 3
    Electronic Resource
    Electronic Resource
    Horizontal Transfer of Archaeal Genes into the Deinococcaceae: Detection by Molecular and Computer-Based Approaches (2000)
    Springer
    Journal of molecular evolution 51 (2000), S. 587-599 
    Details
    ISSN: 1432-1432
    Keywords: Key words: Horizontal gene transfer — BLAST comparison — Genomes —Deinococcus—Thermus—Meiothermus— A/V-ATPase — Prolyl-tRNA synthetase — Biotin carboxylase — Enolase — Bioinformatics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Members of the Deinococcaceae (e.g., Thermus, Meiothermus, Deinococcus) contain A/V-ATPases typically found in Archaea or Eukaryotes which were probably acquired by horizontal gene transfer. Two methods were used to quantify the extent to which archaeal or eukaryotic genes have been acquired by this lineage. Screening of a Meiothermus ruber library with probes made against Thermoplasma acidophilum DNA yielded a number of clones which hybridized more strongly than background. One of these contained the prolyl tRNA synthetase (RS) gene. Phylogenetic analysis shows the M. ruber and D. radiodurans prolyl RS to be more closely related to archaeal and eukaryal forms of this gene than to the typical bacterial type. Using a bioinformatics approach, putative open reading frames (ORFs) from the prerelease version of the D. radiodurans genome were screened for genes more closely related to archaeal or eukaryotic genes. Putative ORFs were searched against representative genomes from each of the three domains using automated BLAST. ORFs showing the highest matches against archaeal and eukaryotic genes were collected and ranked. Among the top-ranked hits were the A/V-ATPase catalytic and noncatalytic subunits and the prolyl RS genes. Using phylogenetic methods, ORFs were analyzed and trees assessed for evidence of horizontal gene transfer. Of the 45 genes examined, 20 showed topologies in which D. radiodurans homologues clearly group with eukaryotic or archaeal homologues, and 17 additional trees were found to show probable evidence of horizontal gene transfer. Compared to the total number of ORFs in the genome, those that can be identified as having been acquired from Archaea or Eukaryotes are relatively few (approximately 1%), suggesting that interdomain transfer is rare.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002390010122
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  • 4
    Electronic Resource
    Electronic Resource
    The search for common anthropogenic impacts on biodiversity: a global network (2000)
    Springer
    Journal of insect conservation 4 (2000), S. 3-9 
    Details
    ISSN: 1572-9753
    Keywords: global trends ; Carabidae ; bioindicators ; urban-rural gradients ; pitfall traps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract We introduce an initiative to assess and compare landscape changes related to human activities on a global scale, using a single group of invertebrates. The GLOBENET programme uses common field methodology (pitfall trapping), to appraise assemblages of ground beetles (Coleoptera, Carabidae) in visually-similar land-mosaics (urban-rural gradients). Carabids were selected as the focal taxon as they are sufficiently varied (both taxonomically and ecologically), abundant and sensitive to the environment. However, work on other taxa is comparable with the GLOBENET framework. The continuum of decreasing human pressure from city centres into the surrounding countryside was selected to represent human-caused disturbance for this initial stage of GLOBENET because these gradients can be found virtually all over the world. Through the broad-scale assessment envisioned in the GLOBENET programme, we seek to separate general, repeated effects on biodiversity from those that depend on local environments or particular biotic assemblages. Based on this understanding we aim to develop simple tools and protocols for assessing ecological effects of human-caused landscape changes, which could help to sustainably manage landscapes for biodiversity and for human requirements. For instance, the response of different functional groups of carabids to these landscape changes may help guide management practices. Further GLOBENET developments and information are available at our website: http://www.helsinki.fi/science/globenet/
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009655127440
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  • 5
    Electronic Resource
    Electronic Resource
    How Useful are Ant Assemblages for Monitoring Habitat Disturbance on Grasslands in South Eastern Australia? (2000)
    Springer
    Journal of insect conservation 4 (2000), S. 153-159 
    Details
    ISSN: 1572-9753
    Keywords: indicators ; remnant habitats ; environmental surveys ; functional groups
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Nature of Science, Research, Systems of Higher Education, Museum Science
    Notes: Abstract Native grasslands are one of the most endangered ecosystems in south eastern Australia. Conservation of grassland remnants and development of effective indicator groups to monitor their quality is a high priority. Recent surveys of epigaeic invertebrates have revealed several candidate groups for this. Ants are a popular focal group for invertebrate surveys in the region. The ant species richness and functional groups on four series of grassland sites in Victoria suggest that small scale heterogeneity is sufficiently high that the predictive indicator values of ants are limited, and that ants may not be sufficiently sensitive to floristic change to employ them alone in monitoring grassland condition in the region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009668817271
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  • 6
    Electronic Resource
    Electronic Resource
    The Stability of Magnetic VorticesRID="*"ID="*"Research on this paper was supported by NSERC under grant N7901 (2000)
    Springer
    Communications in mathematical physics 212 (2000), S. 257-275 
    Details
    ISSN: 1432-0916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics , Physics
    Notes: Abstract: We study the linearized stability of n-vortex (n∈ℤ) solutions of the magnetic Ginzburg–Landau (or Abelian Higgs) equations. We prove that the fundamental vortices (n = ± 1) are stable for all values of the coupling constant, λ, and we prove that the higher-degree vortices (|n|≥ 2) are stable for λ 〈 1, and unstable for λ 〉 1. This resolves a long-standing conjecture (see, eg, [JT]).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00005526
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  • 7
    Electronic Resource
    Electronic Resource
    Species- and Age-Related Differences in Susceptibility to Pesticide Exposure for Two Amphibians, Rana pipiens, and Bufo americanus (2000)
    Springer
    Bulletin of environmental contamination and toxicology 64 (2000), S. 263-270 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001289910039
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  • 8
    Electronic Resource
    Electronic Resource
    Regional distribution and pH sensitivity ofAzospirillum associated with wheat roots in Eastern Australia (1989)
    Springer
    Microbial ecology 17 (1989), S. 299-309 
    Details
    ISSN: 1432-184X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In a survey ofAzospirillum spp. on the roots and associated soil of wheat grown in eastern Australia, azospirilla were isolated from approximately 40% of samples from areas of soil pH between 5.0 and 6.6. However, azospirilla isolates were rare in soil between pH 4.5 and 5.0 and absent below pH 4.5. Of 25 independent isolates, 17 wereA. brasiliense and eight wereA. lipoferum. No selection forA. brasiliense Nir− strains by wheat roots was observed. Only one of six endorhizosphere isolates wereA. brasiliense Nir−, compared with three of nine from unsterilized roots plus associated soil, and three of eight from soil. With a medium buffered with 0.05 M malate and 0.05 M phosphate, it was found that allAzospirillum isolates had a lower minimum pH for growth when supplied with fixed nitrogen than when grown under nitrogen-fixing conditions. Strains isolated from soils had a minimum pH for growth that was less than the pH of the soil from which they were isolated. However, a significant proportion of strains isolated from roots had a minimum pH for growth that was higher than the pH of the associated soil suggesting that the wheat roots provided an ecological niche protecting against soil acidity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02012842
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  • 9
    Electronic Resource
    Electronic Resource
    Central connections of the olfactory bulb in the weakly electric fish, Gnathonemus petersii (1989)
    Springer
    Cell & tissue research 257 (1989), S. 423-436 
    Details
    ISSN: 1432-0878
    Keywords: Olfactory system ; Electric fish ; HRP/Cobalt labelling ; Gnathonemus petersii (Teleostei)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary We have investigated the central connections of the “classical” olfactory system in the weakly electric fish Gnathonemus petersii using HRP and cobalt labelling techniques. The olfactory bulb projects bilaterally via the medial and lateral olfactory tracts to restricted areas of the telencephalon, namely to its rostromedial, lateral and posterior medial parts. The most extensive telencephalic target is the posterior terminal field, which arcs around the lateral forebrain bundle at levels posterior to the anterior commissure. Projections to the contralateral hemisphere cross in the ventral telencephalon rostral to the anterior commissure and via the posterior dorsal part of the anterior commissure; endings are also present within the anterior commissure. Bilateral projections to the preoptic area, to the nucleus posterior tuberis and to an area in the thalamus are apparent. In all cases, contralateral projections are less extensive than those on the side ipsilateral to the injected bulb. A projection via the medial olfactory tract can be followed to the contralateral bulb. Following injections into the olfactory bulb, retrogradely labelled neurons are found in the contralateral bulb and in six telencephalic areas; they are also present in the periventricular diencephalon and in an area lateral to the nucleus posterior tuberis. The present results support the suggestion that a reduction in olfactory input to the telencephalon occurs together with increased telencephalic differentiation in actinopterygian fishes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00261845
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  • 10
    Electronic Resource
    Electronic Resource
    Intermediary carbohydrate metabolism (1938)
    Springer
    Reviews of physiology, biochemistry and pharmacology 40 (1938), S. 164-203 
    Details
    ISSN: 1617-5786
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02320795
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