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  • 1
    Monograph available for loan
    Monograph available for loan
    Hightech und Heimatkunde : Wirtschaft und Wissenschaft in den Regionen (2009)
    Essen : Ed. Stifterverband
    Details Availability
    Call number: M 11.0327
    Type of Medium: Monograph available for loan
    Pages: 176 S. , Ill., Kt.
    ISBN: 9783922275275
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    Occurrence of integron-associated resistance gene cassettes located on antibiotic resistance plasmids isolated from a wastewater treatment plant (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology ecology 45 (2003), S. 0 
    Details
    ISSN: 1574-6941
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The role of a municipal wastewater treatment plant as a reservoir for bacteria carrying antibiotic resistance plasmids was analysed. Altogether, ninety-seven different multiresistance plasmids were isolated and screened by PCR for the presence of class 1 integron-specific sequences. Twelve of these plasmids were identified to carry integrons. In addition, integron-specific sequences were found on plasmid-DNA preparations from bacteria residing in activated sludge and in the final effluents of the wastewater treatment plant. Sequencing and annotation of the integrons identified nineteen different gene cassette arrays, containing twenty-one different resistance gene cassettes. These cassettes carry genes encoding eight different aminoglycoside-modifying enzymes, seven dihydrofolate reductases, three β-lactamases, two chloramphenicol resistance proteins and two small exporter proteins. Moreover, new gene cassettes and cassettes with unknown function were identified. Eleven gene cassette combinations are described for the first time. Six integron-associated gene cassette arrays are located on self-transmissible, putative broad-host-range plasmids belonging to the IncP group. Hybridisation analyses, using the integron-specific gene cassette arrays as templates and labelled plasmid-DNA preparations from bacteria of the final effluents as hybridisation probes, revealed that bacteria containing integron-specific sequences on plasmids are released into the environment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0168-6496(03)00164-8
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  • 3
    Electronic Resource
    Electronic Resource
    Rhizobium leguminosarum bv. viciae contains a second fnr/fixK-like gene and an unusual fixL homologue (1996)
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 21 (1996), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Genes of Rhizobium leguminosarum bv. viciae VF39 coding for the regulatory elements NifA, FixL and FixK were isolated, sequenced and genetically analysed. The fixK–fixL region is located upstream of the fixNOQP operon on the non-nodulation plasmid pRleVF39c. The deduced amino acid sequence of FixL revealed an unusual structure in that it contains a receiver module (homologous to the N-terminal domain of response regulators) fused to its transmitter domain. An oxygen-sensing haem-binding domain, found in other FixL proteins, is conserved in R. leguminosarum bv. viciae FixL. R. leguminosarum bv. viciae possesses a second fnr-like gene, designated fixK, whose encoded gene product is very similar to Rhizobium meliloti and Azorhizobium caulinodans FixK. Individual R. leguminosarum bv. viciae fixK and fixL insertion mutants displayed a Fix+ phenotype. A reduced nitrogen-fixation activity was found for a R. leguminosarum bv. viciae fnrN-deletion mutant, whereas no nitrogen-fixation activity was detectable for a fixK/fnrN double mutant. The R. leguminosarum bv. viciae nifA gene is expressed independently of FixL and FixK under aerobic and microaerobic conditions, whereas fixL gene expression is induced under microaerobiosis. Another orf was identified downstream of fixK–fixL and encodes a product which has homology to pseudoazurins from different species. Mutation of this azu gene showed that it is dispensable for nitrogen fixation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1996.6321348.x
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  • 4
    Electronic Resource
    Electronic Resource
    A theory of rules for enumerated classes of functions (1995)
    Springer
    Archive for mathematical logic 34 (1995), S. 47-63 
    Details
    ISSN: 1432-0665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We define an applicative theory $\mbox{{\boldmath\bf CL$_2$}} similar to combinatory logic which can be interpreted in classes of functions possessing an enumerating function. In contrast to the models of classical combinatory logic, it is not necessarily assumed that the enumerating function itself belongs to that function class. Thereby we get a variety of possible models including e. g. the classes of primitive recursive, recursive, elementary, polynomial-time computable or $\varepsilon_0$ -recursive functions. We show that in $\mbox{{\boldmath\bf CL$_2$}}$ a major part of the metatheory of enumerated classes of functions can be developed. Namely, a kind of $\lambda$ -abstraction can be defined and abstract versions of the $S^m_n$ - and (Primitive) Recursion Theorems are proved. Thereby, a closer analysis of the phenomenon of the different recursion theorems is achieved. A theory closely related to $\mbox{{\boldmath\bf CL$_2$}}$ can be used to replace the applicative part of Feferman's theories for explicit mathematics. So this work can be seen as an answer to Feferman's question to formulate a theory for explicit mathematics in which operations can be interpreted as primitive recursive or even more feasible ones. Finally it is shown that the proof-theoretical strength of various theories for explicit mathematics is preserved when replacing the applicative part of the theories by our theory together with an operation for primitive recursion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01269876
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  • 5
    Electronic Resource
    Electronic Resource
    A theory of rules for enumerated classes of functions (1995)
    Springer
    Archive for mathematical logic 34 (1995), S. 47-63 
    Details
    ISSN: 1432-0665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract We define an applicative theoryCL 2 similar to combinatory logic which can be interpreted in classes of functions possessing an enumerating function. In contrast to the models of classical combinatory logic, it is not necessarily assumed that the enumerating function itself belongs to that function class. Thereby we get a variety of possible models including e. g. the classes of primitive recursive, recursive, elementary, polynomial-time comptable ofɛ 0-recursive functions. We show that inCL 2 a major part of the metatheory of enumerated classes of functions can be developed. Namely, a kind of λ-abstraction can be defined and abstract versions of theS n m - and (Primitive) Recursion Theorems are proved. Thereby, a closer analysis of the phenomenon of the different recursion theorems is achieved. A theory closely related toCL 2 can be used to replace the applicative part of Feferman's theories for explicit mathematics. So this work can be seen as an answer to Feferman's question to formulate a theory for explicit mathematics in which operations can be interpreted as primitive recursive or even more feasible ones. Finally it is shown that the proof-theoretical strength of various theoreies for explicit mathematics is preserved when replacing the applicative part of the theories by our theory together with an operation for primitive recursion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01269876
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  • 6
    Electronic Resource
    Electronic Resource
    The Rhizobium meliloti fdxN gene encoding a ferredoxin-like protein is necessary for nitrogen fixation and is cotranscribed with nifA and nifB (1989)
    Springer
    Molecular genetics and genomics 216 (1989), S. 293-302 
    Details
    ISSN: 1617-4623
    Keywords: Rhizobium meliloti ; Symbiotic nitrogen fixation ; Ferredoxin-like proteins ; Mutational analysis ; Operon structure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Sequencing of the Rhizobium meliloti DNA region downstream of nifA revealed the existence of nifB, fdxN and ORF3. The molecular weight of the fdxN protein (Mr 6830) and the distribution of cysteine residues in its deduced amino acid sequence is typical for low molecular weight bacterial ferredoxins. Interposon insertion and plasmid integration mutagenesis demonstrated that FdxN is essential for nitrogen fixation in R. meliloti, whereas the predicted translation product of ORF3 (Mr 8708) is not necessary for this process. In contrast, ferredoxin-like proteins, which are encoded by nifB-associated genes, are not required for nitrogen fixation in all other organisms analysed so far. Plasmid integration mutagenesis additionally revealed that nifA, nifB and fdxN form one transcriptional unit. This result was confirmed by complementation analysis of polar interposon insertion mutants of nifA, nifB and fdxN and by complementation of a non-polar nifA deletion mutant. A DNA sequence resembling a typical nif consensus promoter, which is preceded by two putative NifA-binding sites, is located in front of nifB. This nifB promoter can be activated in Escherichia coli by the nifA gene product of Klebsiella pneumoniae to the same level as that of the R. meliloti nifH promoter. In contrast, R. meliloti NifA stimulates the nifH promoter more efficiently than the nifB promoter. This low-level activation of the nifB promoter may be the reason why transcription of nifB and fdxN is initiated primarily at a promoter in front of nifA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334368
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  • 7
    Electronic Resource
    Electronic Resource
    An Fnr-like protein encoded in Rhizobium leguminosarum biovar viciae shows structural and functional homology to Rhizobium meliloti FixK (1990)
    Springer
    Molecular genetics and genomics 223 (1990), S. 138-147 
    Details
    ISSN: 1617-4623
    Keywords: Symbiotic nitrogen fixation ; Oxygen regulation ; Interspecies complementation ; Sequence analysis ; Anaeroboxes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A 1.9 kb DNA region of Rhizobium leguminosarum biovar viciae strain VF39 capable of promoting microaerobic and symbiotic induction of the Rhizobium meliloti fixN gene was identified by heterologous complementation. Sequence analysis of this DNA region revealed the presence of two complete open reading frames, orf240 and orf114. The deduced amino acid sequence of orf240 showed significant homology to Escherichia coli Fnr and R. meliloti FixK. The major difference between ORF240 and FixK is the presence of 21 N-terminal amino acids in ORF240 that have no counterpart in FixK. A similar protein domain is also present in E. coli Fnr and is essential for the oxygen-regulated activity of this protein. Analysis of the nucleotide sequence upstream of orf240 revealed a motif similar to the NtrA-dependent promoter consensus sequence, as well as two DNA regions resembling the Fnr consensus binding sequence. A Tn5-generated mutant in orf240 lost the ability to induce the R. meliloti fixN-lacZ fusion. Interestingly, this mutant was still capable of nitrogen fixation but showed reduced nitrogenase activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315806
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  • 8
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    Tracing the Heroic Through Gender (2021)
    Nomos Verlagsgesellschaft mbH & Co. KG
    Details
    Publication Date: 2023-12-20
    Description: In nearly all societies and epochs, the heroic is gendered on many levels. However, social and cultural production of the heroic cannot be understood solely through the lens of masculinity, nor does it make sense to regard women or femininity merely as exceptions. Rather, it is important to take the relational character seriously. This volume is the first attempt to employ gender as an analytical category for heroism research. Using diverse approaches from the humanities, gender serves as a tracer of the heroic and as an instrument for examining its historical contexts, its medial and performative manifestations, as well as its temporal cycles and transformations. With the help of the gender category and its attributes, the heroic is reevaluated.
    Keywords: HM401-1281 ; Helden ; Heroic ; Gender ; bic Book Industry Communication::J Society & social sciences::JF Society & culture: general::JFF Social issues & processes::JFFP Social interaction
    Language: English
    Format: image/png
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    E-BOOK
  • 9
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    A systematic comparison of tropical waves over northern Africa. Part II: Dynamics and thermodynamics (2019)
    American Meteorological Society (AMS)
    Details
    Publication Date: 2019
    Description: Journal of Climate, Ahead of Print. 〈br/〉
    Print ISSN: 0894-8755
    Electronic ISSN: 1520-0442
    Topics: Geosciences , Physics
    Published by American Meteorological Society (AMS)
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  • 10
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    Metagenome and metaproteome analyses of microbial communities in mesophilic biogas-producing anaerobic batch fermentations indicate concerted plant carbohydrate degradation (2013)
    Elsevier
    Details
    Publication Date: 2013-07-01
    Print ISSN: 0723-2020
    Electronic ISSN: 1618-0984
    Topics: Biology
    Published by Elsevier
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