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  • Articles: DFG German National Licenses  (35)
  • 2000-2004
  • 1995-1999  (35)
  • 1955-1959
  • 1999  (35)
  • 1
    Electronic Resource
    Electronic Resource
    Monopoles and harmonic maps (1999)
    College Park, Md. : American Institute of Physics (AIP)
    Journal of Mathematical Physics 40 (1999), S. 5440-5455 
    Details
    ISSN: 1089-7658
    Source: AIP Digital Archive
    Topics: Mathematics , Physics
    Notes: Recently Jarvis has proved a correspondence between SU(N) monopoles and rational maps of the Riemann sphere into flag manifolds. Furthermore, he has outlined a construction to obtain the monopole fields from the rational map. In this paper we examine this construction in some detail and provide explicit examples for spherically symmetric SU(N) monopoles with various symmetry breakings. In particular we show how to obtain these monopoles from harmonic maps into complex projective spaces. The approach extends in a natural way to monopoles in hyperbolic space and we use it to construct new spherically symmetric SU(N) hyperbolic monopoles. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.533038
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Behavior Problems and Mental Health Contacts in Adopted, Foster, and Nonadopted Children (1999)
    Oxford, UK and Boston, USA : Blackwell Publishers Ltd.
    The @journal of child psychology and psychiatry 40 (1999), S. 0 
    Details
    ISSN: 1469-7610
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine , Psychology
    Notes: The implications of adoption for the emotional and behavioral adjustment of children have been an issue in child welfare for many years. Past research has suggested that adopted children are over-represented in mental health settings. In addition, some studies have suggested that adopted and nonadopted children differ on measures of social, emotional, behavioral, and cognitive functioning. The current study used data from a large, representative sample in the United States to examine whether adopted children are more likely to have had mental health contacts or emotional or behavioral problems than nonadopted children. Age of placement in the adoptive home was examined as a variable contributing to the adjustment of adopted children. Results suggest that adopted and foster children are more likely to have mental health contacts than nonadopted children. Results are mixed regarding whether adopted and foster children have more behavior problems than nonadopted children. However, significant differences between adopted, foster, and nonadopted children disappeared when a small group of influential cases were removed. This suggests that the differences seen between the groups reflect a small number of cases and are not representative of the groups of adoptees and foster children as a whole. The vast majority of adopted children showed patterns of behavior problems similar to those of nonadopted children. These results are discussed in relation to the past literature and areas for future research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1469-7610.00538
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  • 3
    Electronic Resource
    Electronic Resource
    The ultraviolet photodissociation dynamics of hydrogen bromide (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 281-288 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The technique of H Rydberg atom photofragment translational spectroscopy has been applied to investigate the ultraviolet photodissociation dynamics of hydrogen bromide. Branching fractions between the channels forming ground Br(2P3/2) and spin-orbit excited Br(2P1/2) atoms have been determined at 15 independent wavelengths in the range 201–253 nm, and photofragment recoil anisotropies for these two channels have been characterized at six different wavelengths within the same wavelength range. The channel forming ground state products, H+Br(2P3/2), is observed to arise solely from a perpendicular (i.e., ΔΩ=1) transition at all excitation energies, whereas the channel to formation of excited state products, H+Br(2P1/2), has a marked wavelength dependence: at long wavelengths (λ=243 nm), the photofragments are produced by a parallel (i.e., ΔΩ=0) photodissociation mechanism, which becomes more perpendicular in character as the photolysis energy is increased. Within the wavelength range studied, the branching fractions indicate that Br(2P3/2) products are formed in preference to Br(2P1/2) products, with propensities that are relatively invariant to excitation wavelength, although a small, yet pronounced, cusp appears at λ∼235 nm. The observations are discussed with reference to the known behavior of the other hydrogen halides and highlight the influence of spin-orbit interactions in the photofragmentation dynamics of this series of molecules. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478063
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  • 4
    Electronic Resource
    Electronic Resource
    Benchmark enthalpies of formation and binding energies of proton-bound pairs between HCN and HCN, NH3, H2O, and HF (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 7779-7788 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The relative thermochemical properties of cluster ions (solvation enthalpies, entropies, and free energies) can be obtained from experimental techniques such as high pressure mass spectrometry and selected-ion flow tube mass spectrometry. Theory can play an important role in these studies by providing both accurate binding energies of the smaller members of the cluster families and insight into the structure and bonding in the cluster ions. This study assesses the performance of a variety of levels of ab initio and density functional theories for predicting the structures and energies of one family of cluster ions, the proton-bound dimers between HCN and HCN, NH3, H2O, and HF. The theoretical procedures were assessed based on their performance relative to high-level treatments such as QCISD(T) correlation, the 6-311+G(2df,p) basis set, and G2 energy calculations. The results of the assessment indicate that MP2/6-31G(d) optimized geometries are sufficient for the calculation of binding energies and heats of formation with advanced methods such as G2. Further increases in basis set size and electron correlation improve the geometries of the dimers, but these geometric changes have little impact on the final high-level energy calculations. The heats of formation and binding energies of the clusters are best described by G2 theory, but modified versions of G2 such as G2(MP2) and G2(MP2,SVP) also provide reliable values. Calculated binding energies of these four proton-bound dimers are compared to available experimental values from the literature, and the effect of basis set superposition error is examined © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478686
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Transient transcriptional activation of the IncI1 plasmid anti-restriction gene (ardA) and SOS inhibition gene (psiB) early in conjugating recipient bacteria (1999)
    Oxford BSL : Blackwell Science Ltd
    Molecular microbiology 31 (1999), S. 0 
    Details
    ISSN: 1365-2958
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: The ardA gene of the enterobacterial plasmid ColIbP-9 acts to alleviate restriction of DNA by type I systems, while psiB inhibits induction of the bacterial SOS response. Both genes are transferred early in a round of bacterial conjugation as part of the plasmid leading region. We report here that ardA and psiB are transcribed transiently after their conjugative transport into the recipient cell. Transcript levels, monitored by competitive reverse transcription–polymerase chain reaction (RT–PCR) amplification of RNA templates, started to increase about 5 min after the initiation of conjugation in a cell population and probably before the first round of plasmid transfer was completed. Genetic evidence is given that the expression of ardA and psiB is activated when the genes enter the recipient cell on the transferring plasmid strand. It is proposed that these and other leading region genes function to promote the establishment of the immigrant plasmid in the new host and are expressed by transcription from promoters active only in single-stranded DNA.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2958.1999.01153.x
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  • 6
    Electronic Resource
    Electronic Resource
    Ironing out the protein folding problem? (1999)
    [s.l.] : Nature America Inc.
    Nature biotechnology 17 (1999), S. 136-137 
    Details
    ISSN: 1546-1696
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: [Auszug] Folding an isolated or expressed globular protein is a major biotechnological problem and often limits the commercialization of protein–based therapeutics. In this issue, Alan Fersht and colleagues present a potential solution, using a biomimetic approach that exploits elements of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/6136
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  • 7
    Electronic Resource
    Electronic Resource
    Identification of Cd36 ( Fat ) as an insulin-resistance gene causing defective fatty acid and glucose metabolism in hypertensive rats (1999)
    [s.l.] : Nature America Inc.
    Nature genetics 21 (1999), S. 76-83 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] The human insulin-resistance syndromes, type 2 diabetes, obesity, combined hyperlipidaemia and essential hypertension, are complex disorders whose genetic basis is unknown. The spontaneously hypertensive rat (SHR) is insulin resistant and a model of these human syndromes. Quantitative trait loci ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/5013
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of human transcriptomes (1999)
    [s.l.] : Nature America Inc.
    Nature genetics 23 (1999), S. 387-388 
    Details
    ISSN: 1546-1718
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] How many human genes are expressed ubiquitously, in all human tissues, and how many are expressed in tissue-specific patterns? To answer these fundamental questions in molecular biology, we have analysed 3.5-million transcripts from 19 normal and diseased tissue types. We found that as many as ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/70487
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  • 9
    Electronic Resource
    Electronic Resource
    Controlled Firing of Reaction-Bonded Aluminum Oxide (RBAO) Ceramics: Part II, Experimental Results (1999)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 82 (1999), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The reaction-bonded aluminum oxide (RBAO) process is an attractive alternative to conventional processing of ceramics, because of advantages such as lower costs, enhanced green machinability, near-net-shape forming, and broad microstructural variability. However, various problems are still encountered in the production of RBAO ceramics. Part I of the paper presented model predictions that may allow for the controlled firing of RBAO ceramics. The current work investigates the reaction behavior of RBAO ceramics under the model-predicted conditions (i.e., for varying oxygen content, heat loss, heating cycles, and scale) via thermogravimetry, differential thermal analysis, and analysis of samples that have been fired in a box furnace. By controlling the reaction, one can produce large, crack-free RBAO ceramics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.1999.tb01852.x
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  • 10
    Electronic Resource
    Electronic Resource
    Kansas makes a monkey of itself (1999)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 400 (1999), S. 810-810 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] SirWhen the journalist H. L. Mencken reported on the infamous Scopes trial of 1925, he remarked that the hysteria surrounding it had made a “universal joke” out of the occupants of Dayton, Tennessee, where the trial took place. Now, 74 years later, but only a few ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/23567
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