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  • 1
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    Context-aware multiagent system: Planning home care tasks (2013)
    Springer
    Details
    Publication Date: 2013-05-03
    Print ISSN: 0219-1377
    Electronic ISSN: 0219-3116
    Topics: Computer Science
    Published by Springer
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Microbial plankton across Drake Passage (1996)
    Springer
    Polar biology 16 (1996), S. 613-622 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We determined biomass and activity of microbial plankton across the Polar Front (PF) in Drake Passage during January 1994. Temperature was around 0°C south and between 3 and 5°C north of the PF. Both biomass and activities of microorganisms were significantly lower in the Antarctic waters south of the PF than in the sub-Antarctic waters north of it. Thus, values of chlorophyll a, integrated between 0 and 200 m, reached 150 mgm−2 north, but only 25 mg m−2 south of the PF. Likewise, bacteria varied between 1014 and 4×1013 cells m−2. However, the abundance of heterotrophic nanoflagellates was extremely low throughout Drake Passage (around 3×1010 cells m−2). Bacterial doubling times were long (mean of 25 days). Bacterivory was estimated from the abundance of predators and prey and from temperature. The grazing impact on bacterioplankton biomass was insignificant (less that 0.05% per day) and low on bacterial heterotrophic production (15% per day). Neither biomass nor the activities of microorganisms were found to increase at the PF. The microbial food web was uncoupled and the bacteria did not seem to be controlled by predation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02329059
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  • 3
    Electronic Resource
    Electronic Resource
    Matching and spanning in certain planar graphs (1983)
    Springer
    Theory of computing systems 16 (1983), S. 159-183 
    Details
    ISSN: 1433-0490
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract Call a connected planar graphG legal if it has at least two nodes, no parallel edges or self-loops and at most two terminals (degree 1 nodes) and all terminals and degree 2 nodes are exterior. This class of graphs arose in connection with a two-dimensional generating system for modeling growth by binary cell division. Showing that any permitted pattern can be generated properly requires a matching or pairing lemma. The vertex set of a legal graph withn nodes can be split intop adjacent pairs ands singletons withs p, resulting in a matching which includes at least $$2\left[ {\frac{n}{3}} \right]$$ nodes. This bound is sharp in the sense that there are legal graphs for which this matching is maximum. The matching can be implemented by a linear time algorithm. A legal graph witht terminals and n≥4 nodes has a spanning tree with at most $$\left[ {\frac{{n - t}}{2}} \right] + t$$ terminals; this bound is sharp. Such a spanning tree can be constructed by an algorithm which operates in almost linear time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01744575
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  • 4
    Electronic Resource
    Electronic Resource
    The Schunck class of all “G-perfect groups” (1993)
    Springer
    Archiv der Mathematik 60 (1993), S. 407-413 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01202303
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  • 5
    Electronic Resource
    Electronic Resource
    Possible etiologic agents for toxic oil syndrome: Fatty acid esters of 3-(N-phenylamino)-1,2-propanediol (1995)
    Springer
    Archives of environmental contamination and toxicology 28 (1995), S. 259-264 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract The etiologic agent(s) that was responsible for the 1981 toxic oil syndrome [TOS] epidemic in Spain has not been identified. Liquid chromatography combined with atmospheric pressure ionization tandem mass spectrometry was used for the analysis of oils associated with TOS. Analyses focused on measuring 3-(N-phenylamino)-1,2-propanediol [PAP], the 3-oleyl ester of PAP [MEPAP], and the 1,2-di-oleyl ester of PAP [DEPAP]. DEPAP and MEPAP were found more frequently and at higher concentrations in TOS case-associated oils than in control oils with odds ratios of 13.7 (95% CI 5.0–38) and 21.9 (95% 6.1–78), respectively. Other fatty acid esters of PAP are also likely to be present in the TOS case-associated oils. More significantly, DEPAP and MEPAP were found in aniline-denatured rapeseed oil refined at ITH, the oil refining company with the clearest link to TOS cases, yet these PAP esters were not detected in unrefined aniline-denatured samples of rapeseed oil delivered to ITH. These results show that the esters of PAP were products of the ITH refining process and were not formed spontaneously during storage. PAP esters were not detected in samples of other aniline-denatured rapeseed oils that were refined elsewhere, and which were not associated with illness. These findings provide strong support for the hypothesis that one or more of the fatty acid esters of PAP were the etiologic agents for TOS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217625
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  • 6
    Electronic Resource
    Electronic Resource
    Leydig cell function in streptozotocin-induced diabetic rats (1979)
    Springer
    Cellular and molecular life sciences 35 (1979), S. 1412-1413 
    Details
    ISSN: 1420-9071
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Streptozotocin diabetic rats were infertile as a result of decreased Leydig cell function of the testes. The major changes found were: decreased number of Leydig cells and their spontaneous secretion of testosterone. No change in the receptors to LH on the Leydig cells was observed. LH was found to be obligatory for the regulation of Leydig cell function and fertility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01964042
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  • 7
    Electronic Resource
    Electronic Resource
    Dynamic duopoly with learning through market experimentation (1993)
    Springer
    Economic theory 3 (1993), S. 517-539 
    Details
    ISSN: 1432-0479
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Summary This paper analyzes how learning behaviors can substantially modify the outcome of competition in an oligopolistic industry facing demand uncertainty. We consider the case of a symmetric duopoly game where firms have imperfect information about market demand and learn through observing the volume of their sales. The main body of the paper consists in showing how market experimentation can explain the existence ofprice-dispersion in an oligopolistic industry. We study this phenomenon and its dynamic evolution in the context of an Hotelling duopoly model; we then extend the analysis to general demand functions and toN-firm oligopolies. We discuss some implications of the public good aspect of information about market demand. We then conclude with a few comments on what happens when the value of information in the oligopolistic industry is negative.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01209700
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  • 8
    Electronic Resource
    Electronic Resource
    Identification of phototrophic sulfur bacteria through the analysis of lmwRNA band patterns (1998)
    Springer
    Archives of microbiology 170 (1998), S. 269-278 
    Details
    ISSN: 1432-072X
    Keywords: Key words Phototrophic sulfur bacteria ; Chromatiaceae ; Identification ; lmwRNA ; 5S RNA ; tRNA ; Taxonomic relationships
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Several phototrophic sulfur bacteria were identified preliminarily through the analysis of the low-molecular-weight RNA fraction (lmwRNA) of bacterial cells. This fraction includes the ribosomal 5S RNA and several transfer RNAs. These molecules were separated by high-resolution electrophoresis in polyacrylamide gels, and the resulting band patterns were used as fingerprints for the identification of the organisms. We examined a large number of well-characterized reference strains together with a broad range of purple sulfur bacterial isolates from freshwater and marine environments. A cluster analysis was run using the similarity matrix calculated from the band patterns. Despite the shortcomings of the method, close relatives were clustered together yielding a number of groups consistent with the phylogenetic arrangement established through the analyses of a few available 16S rRNA gene sequences. Thus, the classification obtained gives further support to rearrangement of the group as the analyses of 16S rRNA gene sequences had previously suggested. We conclude that the analysis of lmwRNA band patterns is a rapid and simple tool for grouping and preliminarily identifying new isolates of phototrophic sulfur bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002030050642
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  • 9
    Electronic Resource
    Electronic Resource
    Pentachlorophenol and Pentachloroanisole in Oil Samples Associated with the Toxic Oil Syndrome (1999)
    Springer
    Bulletin of environmental contamination and toxicology 62 (1999), S. 1-7 
    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/s001289900833
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  • 10
    Electronic Resource
    Electronic Resource
    Increased rate of nondisjunction in sex cells derived from low-quality semen (1998)
    Springer
    Human genetics 〈Berlin〉 102 (1998), S. 129-137 
    Details
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The relationship between chromosomal nondisjunction and semen quality was studied in two groups of males who differ highly in their semen quality: 12 individuals with low-quality semen caused by varicocele, and 8 subjects with high-quality semen, selected from sperm donors for in vitro fertilization. Chromosomal nondisjunction was inferred from the rate of disomy found in mature sperm cells. To determine the rate of disomy, we applied fluorescence in situ hybridization using satellite-specific probes for chromosomes 1, 15, 18, X and Y. In sperm cells of males with low-quality semen, the mean rate of disomy for each of the autosomes and of hetero-disomy for the sex chromosomes (XY) was significantly higher than that observed in the high-quality semen samples: more than 15-fold higher for chromosomes 1 and 15, and 7-fold higher for chromosomes 18 and XY. Yet, the homo-disomy rate for each of the sex chromosomes (XX and YY) was almost the same in both types of semen. The large discrepancy between the low- and high-quality semen in the rate of sex chromosome hetero-disomy versus the similar rate of homo-disomy strongly suggests that the abnormal chromosomal segregation in meiocytes of males with low-quality semen resulted from chromosomal nondisjunction at the first meiotic division. The results indicate that men showing poor semen quality are at an increased risk for meiotic nondisjunction, similar to women at the end of their reproductive years.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004390050665
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