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  • 1
    Digitale Medien
    Digitale Medien
    Regulation of peptide antibiotic production in Bacillus (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Molecular microbiology 7 (1993), S. 0 
    Details
    ISSN: 1365-2958
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Medizin
    Notizen: In Bacillus species, starvation leads to the activation of a number of processes that affect the ability to survive during periods of nutritional stress. Activities that are induced include the development of genetic competence, sporulation, the synthesis of degradative enzymes, motility, and antibiotic production. The genes that function in these processes are activated during the transition from exponential to stationary phase and are controlled by mechanisms that operate primarily at the level of transcription initiation. One class of genes functions in the synthesis of special metabolites such as the peptide antibiotics tyrocidine and gramicidin S as well as the cyclic lipopeptide surfactin. These genes include the grs and tyc operons in Bacillus brevis, which encode gramicidin S synthetase and tyrocidine synthetase, respectively, and the srfA operon of Bacillus subtilis which encodes the enzymes of the surfactin synthetase complex. Peptide antibiotic biosynthesis genes are regulated by factors as diverse as the early sporulation gene product Spo0A, the transition-state regulator AbrB, and gene products (ComA, ComP, and ComQ) required for the initiation of the competence developmental pathway.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2958.1993.tb01154.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    CEREBROSIDE IN RICE GRAIN (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of food science 39 (1974), S. 0 
    Details
    ISSN: 1750-3841
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Notizen: Cerebroside (hexosylceramide) was isolated from rice grain, identified and examined for composition of fatty acid, sugar and long-chain base constituents. The cerebroside was observed to contain 12 fatty acids; hydroxyarachidic (59.0%), hydroxylignoceric (19.7%) and hydroxybehenic (10.3%) acids were predominant. Glucose was the only sugar constituent. Three component long-chain bases were found: two were identified as sphingosine (72.9%) and dehydrophytosphin-gosine (17.3%). It is thus suggested that the major species of rice grain cerebroside is N-hydroxyarachidyl-glucosyl-sphingosine.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2621.1974.tb02927.x
    Standort Signatur Erwartet Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Many-electron-wavepackets method (1996)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 60 (1996), S. 1291-1301 
    Details
    ISSN: 0020-7608
    Schlagwort(e): Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We present a computational scheme to study the dynamics of many-electrons in molecular systems by wavepackets method. Several approaches to calculation of nonlinear optical properties for molecules under time-independent or time-dependent external electric fields are presented. Some simple examples of one-dimensional two- or three-electron systems are demonstrated concretely. Implications of these results are discussed in relation to the validity of the many electron wavepackets (MEWP) method. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Numerical coupled Liouville approach: Quantum dynamics of linear molecular aggregates under intense electric fields (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 70 (1998), S. 77-87 
    Details
    ISSN: 0020-7608
    Schlagwort(e): linear molecular aggregate ; coupled Liouville equation ; hyperpolarizability ; optical retarded field ; optical bistability ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We develop a numerical calculation scheme of a dynamics of the quantum network for linear molecular aggregates under time-dependent electric fields. Each molecule is assumed to be an electric dipole arranged linearly with an arbitrary angle from the longitudinal axis. This approximation is considered to be appropriate for the aggregates with large intermolecular distances and allows us to treat intermediate- and large-size aggregates without enormous direct calculations of the Coulomb interactions. The molecular interactions are taken into account by adding the radiations from these dipoles to the external electric fields. The dynamics is performed by solving the coupled Liouville equation constructed from the Liouville equation for each dipole. The effects of the retarded electric fields are evaluated with numerically exact precision by using the sixth-order Runge-Kutta scheme. As a simple example, we examine the linear aggregates involving two dipoles composed of two-state molecules under the continuous laser fields. The effects of the intensity of external fields, the intermolecular distances, and the angles between the dipole and the longitudinal axis on the population differences are investigated. The linear polarizability spectra are calculated by using the definition of nonperturbative polarizability. An abrupt change like the phase-transition behavior in the variation in the population differences for the applied field intensities is observed for the dimer models. Based on these results, we anticipate the population differences for larger (intermediate)-size aggregates.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 77-87, 1998
    Zusätzliches Material: 7 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
    Digitale Medien
    Digitale Medien
    Hyperpolarizabilities of one-dimensional Hn systems: Second hyperpolarizability density analyses for regular and charged solitonlike linear chains (1998)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 70 (1998), S. 269-282 
    Details
    ISSN: 0020-7608
    Schlagwort(e): hyperpolarizability ; hydrogen chain ; bond alternation ; ab initio ; electron correlation ; Chemistry ; Theoretical, Physical and Computational Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Ab initio calculations of the second hyperpolarizabilities (γ) for one-dimensional hydrogen chains (Hn) with different bond-length alternations and charges are performed. We investigate their signs, magnitudes, and chain-length dependences at various electron correlation levels using an extended basis set. Remarkable differences in the γ are observed for different bond-length alternations and for different charged states. In order to elucidate the differences in γ, spatial contributions of electrons to the γ are analyzed for these short and long Hn chains by using the second hyperpolarizability density plots. The effects of the introduction of charged defects into the linear chains on the γ are also investigated by varying the intercharged defects distance.   © 1998 John Wiley & Sons, Inc. Int J Quant Chem 70: 269-282, 1998
    Zusätzliches Material: 13 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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  • 6
    Digitale Medien
    Digitale Medien
    The use of dyestuff-treated rice hulls for removal of heavy metals from waste water (1986)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 31 (1986), S. 75-83 
    Details
    ISSN: 0021-8995
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie , Maschinenbau , Physik
    Notizen: Rice hulls, when coated with the reactive dye of Procion Red or Procion Yellow, was found to be highly effective for removal of many metal ions from aqueous solutions both in batch and column method. When 120-130 ppm solutions were used, quantitative removal could be achieved with Pb2+, Cd2+, and Hg2+. After the adsorption of metal ions, the substrate could be recovered almost completely by treating with dilute hydrochloric or nitric acid solution, and used repeatedly.
    Zusätzliches Material: 5 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/app.1986.070310108
    Standort Signatur Erwartet Verfügbarkeit
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  • 7
    Digitale Medien
    Digitale Medien
    Nonadiabatic treatment of molecular systems by the wavepackets method (1996)
    New York, NY : Wiley-Blackwell
    International Journal of Quantum Chemistry 60 (1996), S. 1261-1270 
    Details
    ISSN: 0020-7608
    Schlagwort(e): Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: We have already developed the many-electron wavepackets (MEWP) method in order to study the dynamics and electronic structure of molecular systems. We extended the MEWP method to study the nonadiabatic effects and formulated a nonadiabatic molecular theory, where both electron and nucleus are treated equivalently. Then we applied our method to the isotope series of hydrogen molecule i.e., H2, HD, and D2, and calculated the total energy and the average distance between nucleus-nucleus, electron-electron, and nucleus-electron in order to analyze numerically the nonadiabatic effect in the molecule. Finally we calculated the real-time evolution of the polarization by means of Chebyshev scheme; and by Fourier transforming this, we found out the excitation spectrum of the system, which corresponds to the electronic excitation and the nuclear vibrational frequency. © 1996 John Wiley & Sons, Inc.
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    Standort Signatur Erwartet Verfügbarkeit
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