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
  • 1
    Electronic Resource
    Electronic Resource
    Water mass distribution in Fram Strait and over the Yermak Plateau in summer 1997 (2000)
    Springer
    Annales geophysicae 18 (2000), S. 687-705 
    Details
    ISSN: 0992-7689
    Keywords: Oceanography: general (Arctic and Antarctic oceanography; water masses) ; Oceanography: physical (general circulation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The water mass distribution in northern Fram Strait and over the Yermak Plateau in summer 1997 is described using CTD data from two cruises in the area. The West Spitsbergen Current was found to split, one part recirculated towards the west, while the other part, on entering the Arctic Ocean separated into two branches. The main inflow of Atlantic Water followed the Svalbard continental slope eastward, while a second, narrower, branch stayed west and north of the Yermak Plateau. The water column above the southeastern flank of the Yermak Plateau was distinctly colder and less saline than the two inflow branches. Immediately west of the outer inflow branch comparatively high temperatures in the Atlantic Layer suggested that a part of the extraordinarily warm Atlantic Water, observed in the boundary current in the Eurasian Basin in the early 1990s, was now returning, within the Eurasian Basin, toward Fram Strait. The upper layer west of the Yermak Plateau was cold, deep and comparably saline, similar to what has recently been observed in the interior Eurasian Basin. Closer to the Greenland continental slope the salinity of the upper layer became much lower, and the temperature maximum of the Atlantic Layer was occasionally below 0.5 °C, indicating water masses mainly derived from the Canadian Basin. This implies that the warm pulse of Atlantic Water had not yet made a complete circuit around the Arctic Ocean. The Atlantic Water of the West Spitsbergen Current recirculating within the strait did not extend as far towards Greenland as in the 1980s, leaving a broader passage for waters from the Atlantic and intermediate layers, exiting the Arctic Ocean. A possible interpretation is that the circulation pattern alternates between a strong recirculation of the West Spitsbergen Current in the strait, and a larger exchange of Atlantic Water between the Nordic Seas and the inner parts of the Arctic Ocean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-000-0687-5
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Mutagenic DNA repair in Escherichia coli XIII Proofreading exonuclease of DNA polymerase III holoenzyme is not operational during UV mutagenesis
    Amsterdam : Elsevier
    Mutation Research DNA Repair Reports 183 (1987), S. 31-37 
    Details
    ISSN: 0167-8817
    Keywords: (Escherichia coli) ; DNA repair ; Exonuclease, proofreading ; Polymerase III holoenzyme ; UV mutagenesis
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0167-8817(87)90042-3
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Non-mutability by ultraviolet light in uvrD recB derivatives of Escherichia coli WP2 uvrA is due to inhibition of RecA protein activation
    Amsterdam : Elsevier
    Mutation Research Letters 226 (1989), S. 141-144 
    Details
    ISSN: 0165-7992
    Keywords: Escherichia coli WP2 uvrA ; RecA protein activation ; SOS system ; UV mutagenesis ; deficiency ; inhibition
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-7992(89)90010-9
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Construction of a umuDC operon substitution mutation in Escherichia coli
    Amsterdam : Elsevier
    Mutation Research Letters 281 (1992), S. 221-225 
    Details
    ISSN: 0165-7992
    Keywords: Escherichia coli ; Gene replacement ; SOS mutagenesis ; umuDC operon ; λ1τ-λB
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-7992(92)90012-7
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    The two-step model of bacterial UV mutagenesis
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 150 (1985), S. 133-139 
    Details
    ISSN: 0027-5107
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(85)90110-1
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Current understanding of UV-induced base pair substitution mutation in E. coli with particular reference to the DNA polymerase III complex
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 181 (1987), S. 219-226 
    Details
    ISSN: 0027-5107
    Keywords: (Escherichia coli) ; Base pair substitution, UV-induced ; DNA polymerase III complex
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(87)90099-6
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Mutagenic DNA repair in Escherichia coli, XX. Overproduction of UmuD' protein results in suppression of the umuC36 mutation in excision defective bacteria
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 250 (1991), S. 199-204 
    Details
    ISSN: 0027-5107
    Keywords: DNA repair, mutagenic ; Error-prone repair ; Ultraviolet mutagenesis ; UmuC36 mutation ; UmuD protein
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(91)90176-O
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Analysis of chimeric UmuC proteins: identification of regions in Salmonella typhimurium UmuC important for mutagenic activity (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 121-129 
    Details
    ISSN: 1617-4623
    Keywords: Key words Escherichia coli ; Salmonella typhimurium ; SOS mutagenesis ; Chimeric proteins ; UmuC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  Unlike Escherichia coli, the closely related bacterium Salmonella typhimurium is relatively unresponsive to the mutagenic effects of DNA-damaging agents. Previous experiments have suggested that these phenotypic differences might result from reduced activity of the S. typhimurium UmuC protein. To investigate this possibility, we have taken advantage of the high degree of homology between the UmuC proteins of E. coli and S. typhimurium and have constructed a series of plasmid-encoded chimeric proteins. The possibility that the phenotypic differences might be due to differential expression of the respective UmuC proteins was eliminated by constructing chimeric proteins that retained the first 25 N-terminal amino acids of either of the UmuC proteins (and presumably the same translational signals), but substituting the remaining 397 C-terminal amino acids with the corresponding segments from the reciprocal operon. Constructs expressing mostly E. coli UmuC were moderately proficient for mutagenesis whereas those expressing mostly S. typhimurium UmuC exhibited much lower frequencies of mutation, indicating that the activity of the UmuC protein of S. typhimurium is indeed curtailed. The regions responsible for this phenotype were more precisely localized by introducing smaller segments of the S. typhimurium UmuC protein into the UmuC protein of E. coli. While some regions could be interchanged with few or no phenotypic effects, substitution of residues 212–395 and 396–422 of E. coli UmuC with those from S. typhimurium resulted in reduced mutability, while substitution of residues 26–59 caused a dramatic loss of activity. We suggest, therefore, that the primary cause for the poor mutability of S. typhimurium can be attributed to mutations located within residues 26–59 of the S. typhimurium UmuC protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Analysis of chimeric UmuC proteins: identification of regions inSalmonella typhimurium UmuC important for mutagenic activity (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 121-129 
    Details
    ISSN: 1617-4623
    Keywords: Escherichia coli ; Salmonella typhimurium ; SOS mutagenesis ; Chimeric proteins ; UmuC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract UnlikeEscherichia coli, the closely related bacteriumSalmonella typhimurium is relatively unresponsive to the mutagenic effects of DNA-damaging agents. Previous experiments have suggested that these phenotypic differences might result from reduced activity of theS. typhimurium UmuC protein. To investigate this possibility, we have taken advantage of the high degree of homology between the UmuC proteins ofE. coli andS. typhimurium and have constructed a series of plasmid-encoded chimeric proteins. The possibility that the phenotypic differences might be due to differential expression of the respective UmuC proteins was eliminated by constructing chimeric proteins that retained the first 25 N-terminal amino acids of either of the UmuC proteins (and presumably the same translational signals), but substituting the remaining 397 C-terminal amino acids with the corresponding segments from the reciprocal operon. Constructs expressing mostlyE. coli UmuC were moderately proficient for mutagenesis whereas those expressing mostlyS. typhimurium UmuC exhibited much lower frequencies of mutation, indicating that the activity of the UmuC protein ofS. typhimurium is indeed curtailed. The regions responsible for this phenotype were more precisely localized by introducing smaller segments of theS. typhimurium UmuC protein into the UmuC protein ofE. coli. While some regions could be interchanged with few or no phenotypic effects, substitution of residues 212–395 and 396–422 ofE. coli UmuC with those fromS. typhimurium resulted in reduced mutability, while substitution of residues 26–59 caused a dramatic loss of activity. We suggest, therefore, that the primary cause for the poor mutability ofS. typhimurium can be attributed to mutations located within residues 26–59 of theS. typhimurium UmuC protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Analysis of the mutagenic properties of the UmuDC, MucAB and RumAB proteins, using a site-specific abasic lesion (1996)
    Springer
    Molecular genetics and genomics 251 (1996), S. 493-498 
    Details
    ISSN: 1617-4623
    Keywords: Escherichia coli ; umuDC ; mucAB ; rumAB ; Specifically located abasic site
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract ThemucAB andrumAB loci have been shown to promote mutagenesis to a greater extent than the structurally and functionally homologousEscherichia coli umuDC operon. We have analyzed the basis of this enhanced mutagenesis by comparing the influence of these operons, relative toumuDC, on the mutagenic properties of each of two abasic sites, specifically located in a single-stranded vector. Experiments with these vectors are useful analytical tools because they provide independent estimates of the efficiency of translesion synthesis and of the relative frequencies of each type of nucleotide insertion or other kind of mutagenic event. TheumuDC, mucAB, andrumAB genes were expressed from their naturalLexA-regulated promoter on low-copy-number plasmids in isogenic strains carrying aumuDC deletion. In addition, plasmids expressing the UmuD'C, MucA'B, or RumA'B proteins were also used. Compared toumuDC, the chief effect ofmucAB was to increase the efficiency of translesion synthesis past the abasic site. The enhanced capacity ofmucAB for translesion synthesis depended about equally on an inherently greater capacity to promote this process and on a greater susceptibility of the MucA protein to proteolytic processing. The RumA protein also appeared to be more susceptible to proteolytic processing, but the inherent capacity of theRum products for translesion synthesis was no greater than that ofUmuDC. dAMP was inserted opposite one of the two abasic sites studied at a somewhat greater frequency in strains expressingrum (82%) compared to those expressingumu (72%), which might result in higher mutation frequencies inrumAB than inumuDC strains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02172378
    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...