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  • 1
    Electronic Resource
    Electronic Resource
    Study of relationships between solvent effectiveness in coal tar pitch extractions and solvent solubility parameters (1991)
    s.l. : American Chemical Society
    Industrial & engineering chemistry research 30 (1991), S. 1579-1582 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie00055a024
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  • 2
    Electronic Resource
    Electronic Resource
    Glucose 6-phosphate dehydrogenase is required for sucrose and trehalose to be efficient osmoprotectants in Sinorhizobium meliloti (2003)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 229 (2003), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Inactivation of the zwf gene in Sinorhizobium meliloti induces an osmosensitive phenotype and the loss of osmoprotection by trehalose and sucrose, but not by ectoine and glycine betaine. This phenotype is not linked to a defect in the biosynthesis of endogenous solutes. zwf expression is induced by high osmolarity, sucrose and trehalose, but is repressed by betaine. A zwf mutant is more sensitive than its parental strain to superoxide ions, suggesting that glucose 6-phosphate dehydrogenase involvement in the osmotic response most likely results from the production of reactive oxygen species during osmotic stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1016/S0378-1097(03)00819-X
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  • 3
    Electronic Resource
    Electronic Resource
    GENETIC CONTROL OF FLOWERING TIME IN ARABIDOPSIS (1998)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology and Plant Molecular Biology 49 (1998), S. 345-370 
    Details
    ISSN: 1040-2519
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Notes: Abstract The timing of the transition from vegetative to reproductive development is of great fundamental and applied interest but is still poorly understood. Recently, molecular-genetic approaches have been used to dissect this process in Arabidopsis. The genetic variation present among a large number of mutants with an early- or late-flowering phenotype, affecting the control of both environmental and endogenous factors that influence the transition to flowering, is described. The genetic, molecular, and physiological analyses have led to identification of different components involved, such as elements of photoperception and the circadian rhythm. Furthermore, elements involved in the signal transduction pathways to flowering have been identified by the cloning of some floral induction genes and their target genes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.arplant.49.1.345
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  • 4
    Electronic Resource
    Electronic Resource
    Glycine betaine loses its osmoprotective activity in a bspA strain of Erwinia chrysanthemi (2001)
    Oxford, UK : Blackwell Science Ltd
    Molecular microbiology 42 (2001), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Erwinia chrysanthemi insertion mutants were isolated that grew poorly specifically in the presence of glycine betaine (GB) or its analogues in high-salt media. Transposon insertions were found to affect the bspA gene, which forms an operon including the psd locus coding for phosphatidylserine decarboxylase. Initial GB uptake is not affected by the bspA mutation. However, in high-salt medium, its initial accumulation is followed by a reduced glucose uptake and a release of GB but not a loss of viability. BspA is homologous to the widespread MscS channel, YggB, but does not seem to constitute a mechanosensitive channel. We suggest that BspA is a protein sensing both intracellular GB and the extracellular salt content of the medium, the hypothesis being built on the observation that BspA is necessary to maintain the GB pool during osmoadaptation in high-salt media containing this osmoprotectant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.2001.02591.x
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  • 5
    Electronic Resource
    Electronic Resource
    Aspects of 2-acetyl-1,3-cyclopentanedione as a chromium(iii) chelating agent: nutritional implications (2003)
    Oxford, UK : Blackwell Science Ltd
    International journal of food science & technology 38 (2003), S. 0 
    Details
    ISSN: 1365-2621
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: The chemistry of 2-acetyl-1,3-cycloalkanediones has acquired increased applied importance because of the great number of applications in the agroalimentary industry. The keto-enol ratios and equilibrium constants for proton reactions of 2-acetyl-1,3-cyclopentanedione have been determined in solution using nuclear magnetic resonance and spectrophotometric methods. Chromium(iii) is an essential nutrient and it seems that high chromium supplementation improves glucose tolerance. Chromium chelates have been shown to have a significant beneficial effect on metal status by increasing metal bioavailability in human diets.The composition and log β-value of the complex formed in aqueous solution by chromium(iii) with the ligand mentioned above have been determined. A detailed reaction scheme is proposed for the 1 : 1 chelation process. The kinetic data are consistent with a mechanism in which the mono-enol tautomer of the ligand reacts with both metallic species, the fully hydrated metal ion and the Cr(OH)2+. The results are discussed in the light of previous work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2621.2003.00629.x
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  • 6
    Electronic Resource
    Electronic Resource
    Regulation of flowering time by FVE, a retinoblastoma-associated protein (2004)
    [s.l.] : Nature Publishing Group
    Nature genetics 36 (2004), S. 162-166 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The initiation of flowering in plants is controlled by environmental and endogenous signals. Molecular analysis of this process in Arabidopsis thaliana indicates that environmental control is exerted through the photoperiod and vernalization pathways, whereas endogenous signals regulate the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng1295
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  • 7
    Electronic Resource
    Electronic Resource
    A QTL for flowering time in Arabidopsis reveals a novel allele of CRY2 (2001)
    [s.l.] : Nature Publishing Group
    Nature genetics 29 (2001), S. 435-440 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Variation of flowering time is found in the natural populations of many plant species. The underlying genetic variation, mostly of a quantitative nature, is presumed to reflect adaptations to different environments contributing to reproductive success. Analysis of natural variation for flowering ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/ng767
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  • 8
    Electronic Resource
    Electronic Resource
    Improved vectors for transcriptional signal screening in corynebacteria (1991)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 84 (1991), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract New promoter-probe and terminator-probe shuttle vectors for Escherichia coli and corynebacteria were constructed. These vectors, working with the uidA gene of E. coli as reporter gene, are very useful for the cloning and subsequent analysis of transcriptional regulatory signals. The β-glucuronidase encoding activity of uidA can be easily detected on agar plates containing chromogenic substrates such as 5-bromo-4-chloro-3-indolyl-β-D-glucuronide (X-gluc). In the terminator-probe vector pUT2, uidA is expressed from a promoter of the Brevibacterium lactofermentum cryptic plasmid pBL1. Multiple cloning sites (MCS) located immediately upstream of uidA allow introduction and selection of terminators or regulatory signals. In the promoter-probe vector pUT3, transcription readthrough from vector promoters is prevented by a terminator of B. lactofermentum isolated using pUT2. We have successfully used pUT2 and pUT3 to isolate several terminators and promoter regions active in B. lactofermentum and shown that the E. coli strong terminator cartridge Ω appears less efficient in corynebacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1991.tb04576.x
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  • 9
    Electronic Resource
    Electronic Resource
    ′uidA-antibiotic-resistance cassettes for insertion mutagenesis, gene fusions and genetic constructions (1992)
    Oxford, UK : Blackwell Publishing Ltd
    FEMS microbiology letters 93 (1992), S. 0 
    Details
    ISSN: 1574-6968
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract We have constructed a series of promoter-probe cassettes that provides powerful tools for insertion mutagenesis, transcription fusions and genetic constructions. These cassettes contain the Tn9 chloramphenicol (CmR) and the Tn903 kanamycin (KmR) resistance genes which are expressed in a large variety of microorganisms; these antibiotic-resistance markers were associated with the uidA promoterless gene. This ß-glucuronidase-encoding gene of Escherichia coli K-12 has been successfully used as reported gene for various organisms including prokaryotes and eukaryotes. The resulting ′uidA-KmR and ′uidA-CmR cassettes (truncated at the ′) can be excized with most of the commonly used restriction enzymes. Furthermore, they are borne by ApR or CmR plasmids which facilitate their utilization. These promoter-probe cassettes allow transcriptional signal localization and regulation studies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1574-6968.1992.tb05105.x
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  • 10
    Electronic Resource
    Electronic Resource
    CORRELATION OF COMPLEXATION RATE CONSTANTS OF 1:1 IRON CHELATES WITH LIGAND DISSOCIATION CONSTANTS. FOOD CONSIDERATIONS (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food biochemistry 27 (2003), S. 0 
    Details
    ISSN: 1745-4514
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Process Engineering, Biotechnology, Nutrition Technology
    Notes: Iron which is present as a trace species in foods and drinks is very important to the young infant for normal growth and development. Nutritional status of iron may affect the metabolism of other nutrien***ts. Iron chelates have been shown to have a significant beneficial effect on metal status by increasing metal bioavailability in human diets.From a study of the complexation of iron(III) with a series of structurally similar dicarbonylic ligands in aqueous solution, thermodynamic and kinetic parameters have been obtained. The existence of an essential reaction mechanism throughout the series has been proved. The established correlation suggests that complexation rates of a structurally similar 1:1 chelate of iron(III) may be predicted from the ligand dissociation constant. Thus, an achievable objective might be to develop quantitative scales of ligand ionization degree for predicting expected behavior of complexation reactions. Since the differences observed in the rates of complex formation are not a result of steric effects but of changes in the metal-ligand electron density, a free-energy relationship has been obtained for the complexation reactions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1745-4514.2003.tb00286.x
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