ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Springer  (82)
  • 2020-2024
  • 2000-2004  (82)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    The Consequences for a Monopolistic Insurance Firm of Evaluating Risk Better than Customers: The Adverse Selection Hypothesis Reversed (2000)
    Springer
    The Geneva risk and insurance review 25 (2000), S. 65-79 
    Details
    ISSN: 1554-9658
    Keywords: asymmetric information ; insurance markets ; value of information ; multidimensional signaling ; informed principal
    Source: Springer Online Journal Archives 1860-2000
    Topics: Economics
    Notes: Abstract This article models a situation in which a monopolistic insurer evaluates risk better than its customers. The resulting equilibrium allocations are compared to the consequences of the standard adverse selection hypothesis. On the positive side, they exhibit the property that low-risk people are better covered than higher-risk people. On the normative side, the article shows that there are two reasons for avoiding excessive risk classification: one is the classical destruction of insurance possibilities, and the other comes from the distrustful atmosphere generated by new asymmetric information.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008749524517
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hunting strategy of a generalist ant species proposed as a biological control agent against termites (2000)
    Springer
    Entomologia experimentalis et applicata 94 (2000), S. 31-40 
    Details
    ISSN: 1570-7458
    Keywords: ants ; Myrmicaria opaciventris ; predation ; behavioural flexibility ; termite control
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We studied the hunting behaviour of Myrmicaria opaciventris (Hymenoptera: Formicidae) in order to evaluate if it can be used as a biological control agent against the termites that damage sugarcane plantations. Hunting workers foraged in groups and recruited nestmates at short-range when they encountered large termite soldiers or groups of small termite workers. Differences in prey capture concerned the: (1) means of detection (from a distance or by contact); (2) termite body part seized (small termites seized by the body; large termites by an appendage); (3) percentages of prey abandoned; and (4) use of venom. The sting of the workers is spatulated implying a topical application of the venom on the prey. Large termites were stretched by several workers whose adherence to the substrate is facilitated by well-developed arolia and claws on the legs while others spread venom on the body and carved it up. An adaptation to termite capture was noted with a distribution of tasks between the workers which subdued prey, and those which transported it. In the former case, the workers easily eliminated termite soldiers, successively attacked several termite workers and even captured new individuals while holding the first ones captured between their mandibles before retrieving them all at once. The remaining individuals were retrieved by the transporting workers. Given this particularly effective predatory strategy, we concluded that, under certain conditions, M. opaciventris can be used as a biological control agent against termites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003900925341
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    The performance of workload rules for order acceptance in batch chemical manufacturing (2000)
    Springer
    Journal of intelligent manufacturing 11 (2000), S. 217-228 
    Details
    ISSN: 1572-8145
    Keywords: Batch process industries ; workload control ; capacity planning ; order acceptance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We investigate the performance of workload rules used to support customer order acceptance decisions in the hierarchical production control structure of a batch chemical plant. Customer order acceptance decisions need to be made at a point in time when no detailed information is available about the actual shop floor status during execution of the order. These decisions need therefore be based on aggregate models of the shop floor, which predict the feasibility of completing the customer order in time. In practice, workload rules are commonly used to estimate the availability of sufficient capacity to complete a set of orders in a given planning period. Actual observations in a batch chemical manufacturing plant show that the set of orders accepted needs to be reconsidered later, because the schedule turns out to be infeasible. Analysis of the planning processes used at the plant shows that workload rules can yields reliable results, however at the expense of a rather low capacity utilization. In practice this is often unacceptable. Since, solving a detailed scheduling problem is not feasible at this stage, this creates a dilemma that only can be solved if we can find more detailed aggregate models than workload rules can provide.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008999002145
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Identification of the Hurst Index of a Step Fractional Brownian Motion (2000)
    Springer
    Statistical inference for stochastic processes 3 (2000), S. 101-111 
    Details
    ISSN: 1572-9311
    Keywords: change-point detection ; Hurst index ; Gaussian processes ; step fractional Brownian motion ; semi-parametric estimation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We propose a semi-parametric estimator for a piece-wise constant Hurst coefficient of a step fractional Brownian motion (SFBM). For the applications, we want to detect abrupt changes of the Hurst index (which represents long-range correlation) for a Gaussian process with a.s. continuous paths. The previous model of multifractional Brownian motion give a.s. discontinuous paths at change times of the Hurst index. Thus, we first propose a new kind of Fractional Brownian Motion, the SFBM and prove some (Hölder) continuity results. After, we propose an estimator of the piecewise constant Hurst parameter and prove its consistency.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009997729317
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Solid-state reactivity of iron molybdate artificially contaminated by antimony ions and its relation with catalytic activity in the selective oxidation of isobutene to methacrolein (2000)
    Springer
    Topics in catalysis 11-12 (2000), S. 167-180 
    Details
    ISSN: 1572-9028
    Keywords: iron–molybdenum–antimony catalysts ; solid-state reactions in catalysts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Catalysts were prepared by impregnation of Fe2(MoO4)3 with different quantities of antimony butoxide. BET surface area measurement, XRD, Mössbauer spectroscopy, CTEM-AEM, XPS and ISS were used to characterize phase and surface architectures and their changes after calcination and catalytic reaction. Before calcination, antimony was present as pure oxide or hydroxide, partly as particles and partly as an incomplete monolayer on the surface of Fe2(MoO4)3. After calcination at 400°C, antimony got detached from the Fe2(MoO4)3 surface and aggregated very intensively, partly as Sb2O4 and partly, through reaction with the iron molybdate, as a mixture of distorted FeSbO4 and MoO3. After reaction or calcination at 500°C, more distorted FeSbO4 and MoO3 are formed, separated from Fe2(MoO4)3. Selective oxidation of isobutene to methacrolein was carried out on the calcined material. Impregnated catalysts show considerably improved catalytic performances compared to the pure Fe2(MoO4)3 phase or mechanical mixtures of it with α-Sb2O4. The catalytic performances are explained by several catalytic cooperations via spillover oxygen. These cooperative effects involve all the oxide phases present in the material having worked as catalyst: Fe2(MoO4)3 (pure or possibly contaminated by small amounts of antimony oxide), FeSbO4, MoO3 and SbyOx.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1027287528394
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    The packing property (2000)
    Springer
    Mathematical programming 89 (2000), S. 113-126 
    Details
    ISSN: 1436-4646
    Keywords: Key words: clutter – packing property – Max-Flow Min-Cut property – minimally non ideal, total dual integrality
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics
    Notes: Abstract. A clutter (V, E) packs if the smallest number of vertices needed to intersect all the edges (i.e. a minimum transversal) is equal to the maximum number of pairwise disjoint edges (i.e. a maximum matching). This terminology is due to Seymour 1977. A clutter is minimally nonpacking if it does not pack but all its minors pack. An m×n 0,1 matrix is minimally nonpacking if it is the edge-vertex incidence matrix of a minimally nonpacking clutter. Minimally nonpacking matrices can be viewed as the counterpart for the set covering problem of minimally imperfect matrices for the set packing problem. This paper proves several properties of minimally nonpacking clutters and matrices.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00011389
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Characterization of the sink/source transition in tobacco (Nicotiana tabacum L.) shoots in relation to nitrogen management and leaf senescence (2000)
    Springer
    Planta 211 (2000), S. 510-518 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Glutamate dehydrogenase – Glutamine synthetase – Leaf senescence – Metabolic signals – Nicotiana (N metabolism) – Nitrogen metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract.  The metabolic, biochemical and molecular events occurring during tobacco (Nicotiana tabacum) leaf ageing are presented, with a particular emphasis on nitrogen metabolism. An integrated model describing the source/sink relationship existing between leaves of different developmental stages along the main plant axis is proposed. The results of our study show that a tobacco plant can be divided into two main sections with regards to sink/source relationships. Sink-to-source transition occurs at a particular leaf stage in which a breakpoint corresponding to an accumulation of carbohydrates and a depletion of both organic and inorganic nitrogen is observed. The sink/source transition is also marked by the appearence of endoproteolytic activities and the induction of both cytosolic glutamine synthetase and NAD(H)-dependent glutamate dehydrogenase transcripts, proteins and activities. The role of the newly induced enzymes and the nature of the potential metabolic and developmental signals involved in the regulation of their expression during leaf senescence are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250000310
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Immunolocalization of glutamine synthetase in senescing tobacco (Nicotiana tabacum L.) leaves suggests that ammonia assimilation is progressively shifted to the mesophyll cytosol (2000)
    Springer
    Planta 211 (2000), S. 519-527 
    Details
    ISSN: 1432-2048
    Keywords: Key words: Cytosol (GS, leaf) – Glutamine synthetase –Nicotiana (N-metabolism) – Nitrogen remobilization – Senescence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract.  Glutamine synthetase (GS) catalyses the formation of glutamine (a major form of nitrogen transport in plants) in an ATP-dependent reaction using ammonium and glutamate. This enzyme is present in the plastids and/or in the cytosol depending on the plant or the organ examined. In order to understand the role of GS isoforms in the remobilization of leaf nitrogen, we studied the localization of GS isoenzymes during natural senescence of tobacco (Nicotiana tabacum L.) leaves. Parallel to the progression of leaf senescence, an increase in cytosolic GS polypeptides was detected in the mesophyll cytosol of senescing leaves while a significant decrease in GS protein content was observed in the phloem companion cells. The presence of GS polypeptides in the leaf cytosol of senescing leaves appears to be the result of an induction of the Gln1-3 gene, the transcripts of which are not detected in mature leaves but are abundant in senescing leaves. Alltogether, our results suggest that during senescence, ammonia assimilation is progressively shifted from the chloroplasts to the cytosol of leaf mesophyll cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250000309
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    A circular mitochondrial plasmid incites hypovirulence in some strains of Cryphonectria parasitica (2000)
    Springer
    Current genetics 37 (2000), S. 242-256 
    Details
    ISSN: 1432-0983
    Keywords: Key words Chestnut blight ; Endothia ; Hypovirulence ; Hypovirus ; Mitochondrial plasmid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the chestnut-blight fungus Cryphonectria parasitica, a plasmid, pCRY1, occurs in the mitochondria of several strains isolated at various locations in the northeastern United States and Canada. The monomer of this plasmid is a 4.2-kb circular double-stranded DNA that has no detectable sequence homology with the 160–kb mitochondrial DNA of Ep155, a standard virulent laboratory strain of C. parasitica. The circular nature and oligomeric characteristics of the plasmid were deduced from the heterogeneous size of plasmid DNA molecules as detected by one- and two-dimensional gel-electrophoresis, the nature and alignment of restriction fragments, and the lack of detectable termini in the nucleotide sequence. The cytoplasmic location of the plasmid was deduced from its co-purification with mitochondria, uniparental (maternal) transmission in sexual crosses, dissociation from the nuclei of the donor strain during its horizontal transfer between vegetatively compatible strains through hyphal anastomoses, and mitochondrial codon usage (UGA=Try). The pCRY1 plasmid contains a long open reading frame that is transcribed and potentially encodes a unique 1214 amino-acid, B-family DNA polymerase similar to those encoded by the LaBelle and Fiji circular mitochondrial plasmids of Neurospora. In this subgroup of proteins, the DTD motif characteristic of B-family DNA polymerases is replaced by TTD. Amino-acid motifs related to those that are characteristic of the 3′→5′ exonuclease domains of B-family DNA polymerases have been located in the amino-terminal portion of the proteins. A comparison of isogenic plasmid-free and plasmid-containing cultures indicates that pCRY1 is an infectious agent that effects a reduction in the pathogenicity of some, but not all, strains of C. parasitica.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050526
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Dynamics of asexual transmission of a mitochondrial plasmid in Cryphonectria parasitica (2000)
    Springer
    Current genetics 37 (2000), S. 257-267 
    Details
    ISSN: 1432-0983
    Keywords: Key words Heterokaryon incompatibility ; het ; Senescence ; Mitochondrial hypovirulence
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract In the chestnut blight fungus Cryphonectria parasitica, as in most fungi, little is known about the efficiency of the asexual transmission of optional mitochondrial plasmids, vertically through conidia, and horizontally through hyphal anastomoses. In this paper, we show that pCRY1, a circular mitochondrial plasmid, is transmitted vertically with 100%-efficiency through conidia. Moreover, the plasmid is transmitted horizontally through hyphal contact from donor strains to vegetatively compatible and most incompatible strains. An allelic difference between the donor and recipient strain, at only one of the five nuclear incompatibility genes that were tested strongly inhibited, but did not absolutely prevent, the transfer of pCRY1 through hyphal fusions. In contrast, allelic differences in any one or several of the other four heterokaryon-compatibility loci suppressed the transmission of the plasmid only partially or not at all. The plasmid was also transmitted among incompatible strains by protoplast fusion without the concomitant transfer of mitochondrial DNA (mtDNA). A comparison of plasmid-bearing with plasmid-free isogenic strains revealed that pCRY1 significantly diminishes the pathogenic potency of some strains of the fungus, but does not affect the virulence of others. Collectively, the observations indicate that the introduction of deleterious mitochondrial genetic elements into natural populations may be a means for managing fungal pathogens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002940050527
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...