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  • 1
    Electronic Resource
    Electronic Resource
    A fourth-order real-space algorithm for solving local Schrödinger equations (2001)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 115 (2001), S. 6841-6846 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We describe a rapidly converging algorithm for solving the Schrödinger equation with local potentials in real space. The algorithm is based on solving the Schrödinger equation in imaginary time by factorizing the evolution operator e−εH to fourth order with purely positive coefficients. The wave functions |ψj〉 and the associated energies extracted from the normalization factor e−εEj converge as O(ε4). The energies computed directly from the expectation value, 〈ψj|H|ψj〉, converge as O(ε8). When compared to the existing second-order split operator method, our algorithm is at least a factor of 100 more efficient. We examine and compare four distinct fourth-order factorizations for solving the sech2(ax) potential in one dimension and conclude that all four algorithms converge well at large time steps, but one is more efficient. We also solve the Schrödinger equation in three dimensions for the lowest four eigenstates of the spherical analog of the same potential. We conclude that the algorithm is equally efficient in solving for the low-lying bound-state spectrum in three dimensions. In the case of a spherical jellium cluster with 20 electrons, our fourth-order algorithm allows the use of very large time steps, thus greatly speeding up the rate of convergence. This rapid convergence makes our scheme particularly useful for solving the Kohn–Sham equation of density-functional theory and the Gross–Pitaevskii equation for dilute Bose–Einstein condensates in arbitrary geometries. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1404142
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  • 2
    Electronic Resource
    Electronic Resource
    The structure of the gene for ribosomal protein L5 in the archaebacterium Sulfolobus acidocaldarius
    Amsterdam : Elsevier
    Biochimie 73 (1991), S. 679-682 
    Details
    ISSN: 0300-9084
    Keywords: L5 ; Sulfolobus ; archaebacteria ; gene structure ; ribosomal protein
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0300-9084(91)90047-5
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  • 3
    Electronic Resource
    Electronic Resource
    Presence of a gene in the archaebacterium Methanococcus vannielii homologous to secY of eubacteria
    Amsterdam : Elsevier
    Biochimie 73 (1991), S. 683-688 
    Details
    ISSN: 0300-9084
    Keywords: archaebacteria ; nucleotide sequence ; protein secretion ; secY gene
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0300-9084(91)90048-6
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  • 4
    Electronic Resource
    Electronic Resource
    Quantitative Real-Time PCR for Equine Cytokine mRNA in Nondecalcified Bone Tissue Embedded in Methyl Methacrylate (1999)
    Springer
    Calcified tissue international 65 (1999), S. 378-383 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Real-Time PCR — Bone — Quantitation —Cytokines — Equine.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. Specific amplification and quantitation of nucleic acid sequences by the polymerase chain reaction (PCR) has been extensively used for the detection of viral infection and gene expression. Although successful amplification of DNA and RNA sequences extracted from paraffin embedded tissue have been described, there are presently no reports available regarding RNA analysis from bone and calcified tissues embedded in hydrophobic acrylic resin. Here we describe a general method for quantitation of specific mRNA sequences extracted from undecalcified bone sections, fixed in paraformaldehyde, and embedded in a hydrophobic acrylic resin. Total RNA was extracted from defined regions of single 50 μm sawed sections. These RNA preparations are suitable for quantitative PCR analysis of mRNA of different cytokines. In addition, the universally expressed housekeeping GAPDH mRNA proved to be useful as an amplification control and to correct for the degree of RNA degradation, which may vary considerably among samples. Reverse transcribed mRNA was amplified and quantitated in Real-Time PCR using a fluorescein labeled internal TaqMan® probe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900717
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  • 5
    Electronic Resource
    Electronic Resource
    066 Screening for novel class-II restriction endonucleases (1992)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 343 (1992), S. 123-124 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00332060
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  • 6
    Electronic Resource
    Electronic Resource
    The immI region of Salmonella phage P22 (1984)
    Springer
    Molecular genetics and genomics 198 (1984), S. 105-109 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Salmonella phage mutants P22 cir4-1, P22 cir5-1 and P22 cir6-1 at 37°C form more or less clear plaques. The mutants complement each other and clear mutations of the immC region (Prell et al. 1983). The mutants exhibit a strongly reduced frequency of lysogenisation, but form stable prophages. The low frequency of lysogenisation of P22 cir5-1 and of P22 cir6-1 is suppressed by an additional ant - mutation. Similarly, about 50% of turbid plaque revertants of both mutants carry ant - suppressor mutations. This suggests interference by the cir5-1 and cir6-1 mutations with the expression of gene ant. In contrast, the cir4-1 mutation seems not to interfere with ant expression, the latent periods of P22 cir4-1 and P22 cir5-1 are reduced and extended, respectively. The geneticly related Salmonella phage L carries a gene able to complement P22 cir4-1.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328708
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  • 7
    Electronic Resource
    Electronic Resource
    The immI region of Salmonella phage P22 (1984)
    Springer
    Molecular genetics and genomics 198 (1984), S. 110-115 
    Details
    ISSN: 1617-4623
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The effects were studied of three clear plaque mutations of phage P22 (cir4-1, cir5-1 and cir6-1) on antirepressor synthesis. The mutant site cir4-1 has no influence on the expression of gene ant. The cir5-1 and cir6-1 mutations prevent the repression of early ant synthesis shortly after infection: P22 cir5-1 exhibits a strong ant-overproduction because it renders the cir5 repressor protein defective for turning off early ant expression (Harvey et al. 1981). P22 cir6-1 exhibits only a low level of constitutive ant synthesis insensitive to cir5-directed repression. Complementation experiments between P22 wild type or mutant in the cir5 or cir6 sites reveal the following phenotypes of the cir6-1 mutation: (1) The cir6-1 site behaves as a weak promotor site insensitive to cir5-directed repression of ant synthesis. (2) In the P22 cir5-1 cir6-1 double recombinant the cir6-1 site is cis dominant preventing ant overproduction as observed in simple P22 cir5-1 infections. (3) Some of the deficient phenotypes of P22 cir6-1 can be complemented by co-infecting P22 mutants carrying a cir6 + allele. These results are explained by the following model: The active cir5 repressor protein is a dimer (or oligomer) and the cir5-1 and cir6-1 mutations map in different domains influencing the repressing as well as the dimer forming activities of this protein. Which particular cir6-1 phenotype is observed depends on the experimental conditions employed, and on the promotor site (either p ANT or cir6-1) from which ant expression procedes. P22 cir5-1 antam19 in su -bacteria does not produce any traceable amount of ant amber protein fragments, and an antam19 allele in trans to ant + restrains synthesis of ant protein.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00328709
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  • 8
    Electronic Resource
    Electronic Resource
    Darstellung von 1-Brom-2-chloräthan und 2-Chlor-1-jodäthan (1965)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 77 (1965), S. 218-218 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19650770509
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  • 9
    Electronic Resource
    Electronic Resource
    Preparation of 1-Bromo-2-chloroethane and 1-Chloro-2-iodoethane (1965)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 4 (1965), S. 241-241 
    Details
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.196502411
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  • 10
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    Erratum: The Dynamics of Coalition Formation on Complex Networks (2018)
    Springer Nature
    Details
    Publication Date: 2018-05-12
    Description: Erratum: The Dynamics of Coalition Formation on Complex Networks Erratum: The Dynamics of Coalition Formation on Complex Networks, Published online: 11 May 2018; doi:10.1038/srep46983 Erratum: The Dynamics of Coalition Formation on Complex Networks
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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