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  • 1
    Electronic Resource
    Electronic Resource
    Preparation and Thermal Decomposition of N,N'-Diacyl-N,N'-Dialkoxyhydrazines: Synthetic Applications and Mechanistic Insights (1995)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 117 (1995), S. 4870-4874 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00122a018
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  • 2
    Electronic Resource
    Electronic Resource
    Smoking, calcium, calcium antagonists, and aging
    Amsterdam : Elsevier
    Experimental Gerontology 25 (1990), S. 393-399 
    Details
    ISSN: 0531-5565
    Keywords: aging ; blood pressure ; calcium antagonists ; peripheral vasoconstriction ; smoking
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0531-5565(90)90077-F
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  • 3
    Electronic Resource
    Electronic Resource
    Two different β-lactamase genes are present in Streptomycees cacaoi (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 99 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract Two β-lactamase genes called blaL and blaU have been cloned independently in Liège and in Umeå, from Streptomyces cacaoi. Genes blaL and blaU were found to differ largely in their nucleotide sequences, although the encoded proteins both belonged to the class A of β-lactamases (active-site serine penicillinases). DNA-hybridization and polymerase chain reaction assays have now demonstrated that both blaL and blaU genes were present in the S. cacaoi strains used in Liège and in Umeå.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05549.x
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  • 4
    Electronic Resource
    Electronic Resource
    Nucleotide sequence of the gene encoding the active-site serine β-lactamase from Streptomyces cacaoi (1988)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 49 (1988), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract The gene encoding the extracellular active-site serine β-lactamase of Streptomyces cacaoi previously cloned into Streptomyces lividans, has the information for the synthesis of a 303 amino-acid precursor. The β-lactamase as excreted by the host S. lividans ML1, has a ragged amino-terminus, indicating either the presence of a leader peptidase of poor specificity or the action of an amino-peptidase. The deduced primary structure has been confirmed by amino acid sequencing of a 10-residue stretch at the amino terminus of the mature protein and an 8-residue stretch containing the active-site serine. The S. cacaoiβ-lactamase is highly homologous with the class A β-lactamases of Streptomyces albus G and Staphylococcus aureus of known three-dimensional structure. Amino acid alignments show that the S. cacaoiβ-lactamase essentially differs from these two latter enzymes by short insertions and deletions that do not affect the spatial disposition of the secondary structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1988.tb02760.x
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  • 5
    Electronic Resource
    Electronic Resource
    Acetonitrile + nitromethane: An example of ideal solvent mixtures (1995)
    Springer
    Journal of solution chemistry 24 (1995), S. 227-240 
    Details
    ISSN: 1572-8927
    Keywords: Densities ; viscosities ; static dielectric constants ; refractive indices ; solvent-solvent interactions ; acetonitrile + nitromethane mixtures at different temperatures
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Densities, viscosities, static dielectric constants and refractive indices of acetonitrile + nitromethane mixtures in the temperature range between 5 and 45°C are reported. Density and viscosity data, analyzed in terms of molar excess volumes and molar excess fluidities, show a weak interactions field between acetonitrile and nitromethane molecules. Lorentz-Lorenz molar refractivities and Kirkwood correlation factors, obtained from refractive indices and dielectric constants data, respectively, indicate that such weak interactions can be atributed to an antiparallel alignment between neighboring dipoles of unlike solvent molecules. Such specific features do not significantly perturb the local structures of the pure components so that acetonitrile + nitromethane mixtures can be considered, in a first approximation, one of the few ideal solvent mixtures for which the physical properties can be determined by applying the additivity rules to the pure components.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00979191
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  • 6
    Electronic Resource
    Electronic Resource
    Drug interaction between lorcainide and rifampicin (1987)
    Springer
    European journal of clinical pharmacology 31 (1987), S. 737-738 
    Details
    ISSN: 1432-1041
    Keywords: lorcainide ; rifampicin ; drug interactions ; plasma concentration
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00541307
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  • 7
    Electronic Resource
    Electronic Resource
    Transcriptional analysis of the dd-peptidase/penicillin-binding protein-encoding dac gene of Streptomyces R61: Use of the promoter and signal sequences in a secretion vector (1990)
    Springer
    Molecular genetics and genomics 223 (1990), S. 114-120 
    Details
    ISSN: 1617-4623
    Keywords: In vivo promoter probing ; S1 mapping ; Protein secretion ; R-TEM β-lactamase ; Streptomyces R61 DD-peptidase/PBP
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The promoter region of the gene encoding the extracellular dd-peptidase/penicillin-binding protein of Streptomyces R61 has been identified by in vivo promoter probing and S1 mapping. A secretion vector, pDML116, was constructed by inserting into the multicopy Streptomyces plasmid pIJ702, a 247 bp DNA sequence that contained the transcriptional, translational and secretory signals and the 12 amino acid N-terminal region-encoding sequence of the mature Streptomyces dd-peptidase/penicillin-binding protein. Insertion, down-stream of this 247 by segment, of the Streptomyces R61 DD-peptidase-encoding gene or the Escherichia coli R-TEM β-lactamase-encoding gene yielded plasmids pDML120 and pDML128, respectively, which allowed expression and secretion of the relevant enzymes by Streptomyces lividans. The maximal secretion levels obtained were 42 mg protein/ml for the autologous Streptomyces dd-peptidase and 0.9 mg protein/ml for the heterologous E. coli β-lactamase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00315803
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  • 8
    Electronic Resource
    Electronic Resource
    Nodulins and nodulin genes of Glycine max (1986)
    Springer
    Plant molecular biology 7 (1986), S. 51-61 
    Details
    ISSN: 1573-5028
    Keywords: Soybean ; Rhizobium ; nitrogen fixation ; gene expression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Nodulins are organ-specific plant proteins induced during symbiotic nitrogen fixation. Nodulins play both metabolic and structural roles within infected and uninfected nodule cells. In soybean, several nodulin genes, coding for abundant nodulins, have been identified and isolated. Structural analysis of some of these genes has revealed their possible mode of regulation and the subcellar location of the protein product. Studies of ineffective symbiosis based on cultivar-strain genotype differences suggested that both partners influence the expression of nodulin genes. Concomitant with nodule organogenesis, the Rhizobium undergoes substantial differentiation leading to the accumulation of nodule-specific bacterial proteins, bacteroidins. The major structural alteration occuring in the infected cell is the formation of a membrane enclosing the bacteroid (peribacteroid membrane). A number of nodulins are specifically targetted to this membrane during endosymbiosis. The induction of nodulins and bacteroidins leads to the formation of an effective nodule. Nodulin genes can be induced in vitro by factors derived from nodules suggesting that trans-activators may be involved in derepression of the host genes necessary for Rhizobium-legume symbiosis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00020131
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  • 9
    Electronic Resource
    Electronic Resource
    Complexation of Li+, Na+ and K+ Ions by [222], [222D], [221], [221D] Cryptands in Acetonitrile at 25 °C: Conductometric Determination of the True Thermodynamic Formation Constants (1999)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 35 (1999), S. 451-465 
    Details
    ISSN: 1573-1111
    Keywords: conductivity ; ion–cryptand complexes ; thermodynamic formation constants in acetonitrile ; lithium ; sodium and potassium perchlorates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A new method is presented for the analysis of precise conductance data to obtain the true thermodynamic formation constants of macrocyclic–cation complexes. The method, based on the Lee–Wheaton theory on mixed electrolytes, takes into consideration the ion pair formation of both the uncomplexed and complexed cations and avoids the use of the simple additivity assumption of the conductances of two electrolytic species present in salt/ligand/solvent systems. The method has been applied to determine the thermodynamic complexation constants of lithium, sodium and potassium ions with the cryptands [221], [222] and their decyl derivatives [221D], [222D] in acetonitrile. The results show that the presence of an alkyl chain in the molecular structure of the cryptands decreases the macrocyclic–cation complexation constant with respect to the values obtained for the parent compounds by almost an order of magnitude. Such a finding has been explained in terms of the asymmetric position in the space of the oxyethylenic bridges of the macrocyclic ligand promoted by the presence of the linked hydrocarbon chain. The above explanation has been confirmed by the anomalous behavior of both the ion-pair association constants of complexed salts and their limiting molar conductivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008053018475
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