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  • Springer  (21)
  • Blackwell Publishing Ltd  (3)
  • 1995-1999  (24)
  • 1940-1944
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  • 1
    Electronic Resource
    Electronic Resource
    Discussion: Biological Correlates of Aggression (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 794 (1996), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1996.tb32510.x
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  • 2
    Electronic Resource
    Electronic Resource
    An environmentally regulated pilus-like appendage involved in Campylobacter pathogenesis (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 20 (1996), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Examination of strains of Campylobacter jejuni, Campylobacter coli, and Campylobacter fetus by electron microscopy revealed that they produced peritrichous pilus-like appendages when the bacteria were grown in the presence of bile salts. Various bile-salt supplements were used and it was found that deoxycholate and chenodeoxycholic acid caused a significant enhancement of pilus production and resulted in a highly aggregative phenotype. Morphologically, the pili were between 4 and 7 nm in width and were greater than 1 μm in length. A gene, termed pspA, which encodes a predicted protein resembling protease IV of Escherichia coli, was identified in C. jejuni strain 81–176. A site-specific insertional mutation within this gene resulted in the loss of pilus synthesis as determined by electron microscopy. Insertions upstream and downstream of the gene had no effect on pilus production. The non-piliated mutant of strain 81–176 showed no reduction in adherence to or invasion of INT 407 cells in vitro. However, this mutant, while still possessing the ability to colonize ferrets, caused significantly reduced disease symptoms in this animal model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2958.1996.tb02526.x
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  • 3
    Electronic Resource
    Electronic Resource
    Use of clones increases the power of physiological experiments on coastal Douglas-fir (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 96 (1996), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The statistical benefit of reduced variability in experiments with clones was quantified with cold hardy Douglas-fir (Pseudotsuga menziesii var. menziesii [Mirb.] Franco) ramets from six clones from a single full-sib family and a check group of open-pollinated seedlings from a bulk seed collection from the same geographic seed source. All groups were cold deacclimated under controlled conditions. The variability in response for physiological attributes (cold hardiness, root growth potential, days to bud-break) was compared within and among groups by using statistical power analyses. Sample sizes required to detect significant differences of varying magnitude between two hypothetical treatment means were calculated. Differences among clones in the average response exhibited for each physiological attribute were large, but within-clone variability was low, relative to the check group of seedlings. Selection of plant material for a hypothetical experiment from this population of several identifiable clones would have consistently resulted in an experiment with greater power than an experiment using these ramets without the clone identities. From a statistical perspective, the best approach to reduce the number of replicates needed to detect treatment differences was selection of experimental plant material from a single clone, especially with prior screening for the most homogeneous clone for the physiological attributes and time periods of interest. However, from a biological perspective, use of a single clone should be approached with caution because of the lack of representation of natural population variability and the possible inability to broadly apply experimental results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1996.tb00459.x
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  • 4
    Electronic Resource
    Electronic Resource
    Performance Analysis of COFDM for Broadband Transmission on a Fading Multipath Channel (1999)
    Springer
    Wireless personal communications 10 (1999), S. 3-17 
    Details
    ISSN: 1572-834X
    Keywords: OFDM ; coding ; broadband ; multipath
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology
    Notes: Abstract This paper gives a unified analysis of the effects of multipath dispersion and Doppler spreading due to fast fading in OFDM systems, deriving simple closed-form expressions for intersymbol and interchannel interference in the most important cases. It shows also why sine wave carriers are in general the optimum bearers for the sub-channels. The expressions for interference are used to estimate the BER performance of coded OFDM, showing that the use of forward error correction (FEC) coding and a guard period are both essential for optimum performance. As an example it is shown that a 64 sub- channel OFDM system can achieve a data rate of 6.4 Mbit/s on a typical urban mobile radio channel.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1018308505538
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  • 5
    Electronic Resource
    Electronic Resource
    A characterization of the $\Sigma_1$ -definable functions of $KP\omega + (uniform\; AC)$ (1998)
    Springer
    Archive for mathematical logic 37 (1998), S. 199-214 
    Details
    ISSN: 1432-0665
    Keywords: Mathematics Subject Classification (1991): 03F10, 03F25
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. The subject of this paper is a characterization of the $\Sigma_1$ -definable set functions of Kripke-Platek set theory with infinity and a uniform version of axiom of choice: $KP\omega+(uniform\;AC)$ . This class of functions is shown to coincide with the collection of set functionals of type 1 primitive recursive in a given choice functional and $x\mapsto\omega$ . This goal is achieved by a Gödel Dialectica-style functional interpretation of $KP\omega+(uniform\;AC)$ and a computability proof for the involved functionals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001530050092
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  • 6
    Electronic Resource
    Electronic Resource
    Micro-mechanics and continuum damage mechanics (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 437-456 
    Details
    ISSN: 1432-0681
    Keywords: Key words continuum damage ; micro-mechanics ; ceramic matrix ; composite modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary  Continuum Damage Mechanics has been applied successfully to technical problems since the idea was introduced by Kachanov almost 40 years ago. In keeping with the traditions of mechanics, the formulation was based on the results of mechanical tests on specimens whose size is measured in centimeters. To model the observations which describe the deterioration of material properties it was found necessary to introduce internal variables referred to as ‘damage’. The approach is phenomenological, with only a minimal attempt to provide a physical interpretation of damage. For this reason the approach has had little appeal to those whose interest is in the physical mechanisms which cause material deterioration. In this presentation a description is given of attempts to develop continuum damage mechanics so that the relationship with the physical mechanism approach is less abrupt. The procedure is illustrated with reference to ceramic matrix composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835656
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  • 7
    Electronic Resource
    Electronic Resource
    Micro-mechanics and continuum damage mechanics (1995)
    Springer
    Archive of applied mechanics 65 (1995), S. 437-456 
    Details
    ISSN: 1432-0681
    Keywords: continuum damage ; micro-mechanics ; ceramic matrix ; composite modelling
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Summary Continuum Damage Mechanics has been applied successfully to technical problems since the idea was introduced by Kachanov almost 40 years ago. In keeping with the traditions of mechanics, the formulation was based on the results of mechanical tests on specimens whose size is measured in centimeters. To model the observations which describe the deterioration of material properties it was found necessary to introduce internal variables referred to as ‘damage’. The approach is phenomenological, with only a minimal attempt to provide a physical interpretation of damage. For this reason the approach has had little appeal to those whose interest is in the physical mechanisms which cause material deterioration. In this presentation a description is given of attempts to develop continuum damage mechanics so that the relationship with the physical mechanism approach is less abrupt. The procedure is illustrated with reference to ceramic matrix composites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00835656
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  • 8
    Electronic Resource
    Electronic Resource
    The promoter region of the carbamoyl-phosphate synthetase III gene ofSqualus acanthias (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 602-609 
    Details
    ISSN: 1432-1432
    Keywords: Squalus acanthias ; Carbamoyl-phosphate synthetase ; Promoter ; Rana catesbeiana ; TATA box ; TACAAA ; C/EBP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Carbamoyl-phosphate synthetase III (CPSase III) ofSqualus acanthias (spiny dogfish) is a nuclear-encoded mitochondrial enzyme that catalyzes glutamine-dependent formation of carbamoyl phosphate for urea synthesis. In this paper we report the results of cloning a 10-kb segment of genomic DNA which includes the region flanking the 5′ end of the spiny dogfish CPSase III gene. A total of 1,295 base pairs of sequence straddling the start codon was obtained. Primer extension experiments revealed that the transcription start site is the G located 114 residues upstream of the translation start codon ATG. The first exon has 240 base pairs, including the 5′ untranslated region, the coding sequence for the signal peptide (38 amino acids), and the four N-terminal amino acids of the mature enzyme. The boundary of the first exon and the first intron of the CPSase III gene is concordant with that of rat and frog (Rana catesbeiana) CPSase I, which have been suggested to have evolved from CPSase III. The putative TATA box sequence, TACAAA, is located at position −31 with an uncommonly found C at the third position. Two C/EBP binding site sequences, ATTCTGCAAG (−405 to −397) and GTGCAGTAAG (−168 to −160), were identified in the promoter region, which suggests that spiny dogfish CPSase III might be subjected to transactivation of transcription by C/EBP-related proteins, as has been reported for rat CPSase I. The preparation and binding of a recombinant RcC/EBP-1 protein (theR. catesbeiana homolog of the mammalian C/EBPα) to the two spiny dogfish C/EBP binding sequences are described. Two putative heatshock binding elements were also identified in the promoter region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02202108
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  • 9
    Electronic Resource
    Electronic Resource
    The Promoter Region of the Carbamoyl-Phosphate Synthetase III Gene of Squalus acanthias (1996)
    Springer
    Journal of molecular evolution 43 (1996), S. 602-609 
    Details
    ISSN: 1432-1432
    Keywords: Key words:Squalus acanthias— Carbamoyl-phosphate synthetase — Promoter —Rana catesbeiana— TATA box — TACAAA — C/EBP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Carbamoyl-phosphate synthetase III (CPSase III) of Squalus acanthias (spiny dogfish) is a nuclear-encoded mitochondrial enzyme that catalyzes glutamine-dependent formation of carbamoyl phosphate for urea synthesis. In this paper we report the results of cloning a 10-kb segment of genomic DNA which includes the region flanking the 5′ end of the spiny dogfish CPSase III gene. A total of 1,295 base pairs of sequence straddling the start codon was obtained. Primer extension experiments revealed that the transcription start site is the G located 114 residues upstream of the translation start codon ATG. The first exon has 240 base pairs, including the 5′ untranslated region, the coding sequence for the signal peptide (38 amino acids), and the four N-terminal amino acids of the mature enzyme. The boundary of the first exon and the first intron of the CPSase III gene is concordant with that of rat and frog (Rana catesbeiana) CPSase I, which have been suggested to have evolved from CPSase III. The putative TATA box sequence, TACAAA, is located at position −31 with an uncommonly found C at the third position. Two C/EBP binding site sequences, ATTCTGCAAG (−405 to −397) and GTGCAGTAAG (−168 to −160), were identified in the promoter region, which suggests that spiny dogfish CPSase III might be subjected to transactivation of transcription by C/EBP-related proteins, as has been reported for rat CPSase I. The preparation and binding of a recombinant RcC/EBP-1 protein (the R. catesbeiana homolog of the mammalian C/EBPα) to the two spiny dogfish C/EBP binding sequences are described. Two putative heat-shock binding elements were also identified in the promoter region.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02202108
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  • 10
    Electronic Resource
    Electronic Resource
    Cloning and characterization of a maize cDNA encoding phytoene desaturase, an enzyme of the carotenoid biosynthetic pathway (1996)
    Springer
    Plant molecular biology 30 (1996), S. 269-279 
    Details
    ISSN: 1573-5028
    Keywords: carotenoid biosynthesis ; endosperm ; gene ; maize ; phytoene desaturase ; regulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract To study regulation of the plastid-localized maize carotenoid biosynthetic pathway, a cDNA encoding phytoene desaturase (PDS) was isolated and characterized. The DNA sequence of the maize Pds cDNA was determined and compared with available dicot Pds genes. The deduced PDS protein, estimated at 64.1 kDa (unprocessed), had a dinucleotide binding domain and conserved regions characteristic of other carotene desaturases. Alignment of available PDS sequences from distantly related organisms suggests that Pds has potential as a phylogenetic tool. By use of heterologous complementation in Escherichia coli, maize PDS was shown to catalyze two desaturation steps converting phytoene to ζ-carotene. RFLP (restriction fragment length polymorphism) mapping was used to place Pds on chromosome 1S near viviparous5 (vp5), and RT-PCR (reverse-transcriptase polymerase chain reaction) analysis indicated reduced Pds transcript in vp5 mutant relative to normal endosperm. Other phytoene-accumulating mutant endosperms, vp2 and white3 (w3), showed no difference in Pds transcript accumulation as compared with normal endosperm counterparts. RT-PCR analysis of Pds transcript accumulation in developing endosperm showed Pds was constitutively expressed. Therefore, endosperm carotenogenesis is not regulated by increasing the level of Pds transcripts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020113
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