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  • 1
    Electronic Resource
    Electronic Resource
    Hedgehog signalling in the mouse requires intraflagellar transport proteins (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 426 (2003), S. 83-87 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Intraflagellar transport (IFT) proteins were first identified as essential factors for the growth and maintenance of flagella in the single-celled alga Chlamydomonas reinhardtii. In a screen for embryonic patterning mutations induced by ethylnitrosourea, here we identify two mouse mutants, ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature02061
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  • 2
    Electronic Resource
    Electronic Resource
    Radiative recombination and filling effect of surface states in porous InP (2001)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 78 (2001), S. 43-45 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Porous InP samples prepared by wet electrochemical anodization techniques are studied by photoluminescence (PL) spectroscopy at 25 K. The PL of as-grown porous InP shows redshift with respect to that of bulk InP. The PL emission is very sensitive to chemical and heat treatment. For instance, the PL obtained from the AgNO3 treated sample shows a blueshift with respect to that of the bulk InP. Moreover the PL spectra from the as-grown porous sample and the AgNO3 treated sample exhibit opposite shift trend on excitation levels. The PL of the AgNO3 treated sample shifts slightly to lower energies with increasing excitation levels, which is similar to that of the bulk InP, while the PL of the as-grown porous InP shifts obviously to higher energies, which is explained by the filling effect of surface states. © 2001 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1337644
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  • 3
    Electronic Resource
    Electronic Resource
    EARLY ANTERIOR/POSTERIOR PATTERNING OF THE MIDBRAIN AND CEREBELLUM (2001)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Neuroscience 24 (2001), S. 869-896 
    Details
    ISSN: 0147-006X
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology , Medicine
    Notes: Abstract Transplantation studies performed in chicken embryos indicated that early anterior/posterior patterning of the vertebrate midbrain and cerebellum might be regulated by an organizing center at the junction between the midbrain and hindbrain. More than a decade of molecular and genetic studies have shown that such an organizer is indeed central to development of the midbrain and anterior hindbrain. Furthermore, a complicated molecular network that includes multiple positive and negative feedback loops underlies the establishment and refinement of a mid/hindbrain organizer, as well as the subsequent function of the organizer. In this review, we first introduce the expression patterns of the genes known to be involved in this patterning process and the quail-chick transplantation experiments that have provided the foundation for understanding the genetic pathways regulating mid/hindbrain patterning. Subsequently, we discuss the molecular genetic studies that have revealed the roles for many genes in normal early patterning of this region. Finally, some of the remaining questions and future directions are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.neuro.24.1.869
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  • 4
    Electronic Resource
    Electronic Resource
    Optimal group symmetric localized molecular orbitals (1994)
    Springer
    Theoretical chemistry accounts 88 (1994), S. 375-381 
    Details
    ISSN: 1432-2234
    Keywords: Group symmetric localized orbital ; Valence bond structure ; Multiconfigurational correlation ; Hybridization theory ; Full optimized reaction space ; Optimization of orbitals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The concept and generating method of optimum group symmetric localized molecular orbitals (OSLMOs) are proposed. The OSLMOs have strong points of orthogonality, equivalence and symmetry, and they are simultaneously as close to the classical VB structure as possible. By using the OSLMOs as one-electron orbitals the multiconfigurational correlation calculations are reduced. The scheme is also a valuable popularization and development to hybridization theory.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01113555
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  • 5
    Electronic Resource
    Electronic Resource
    Study of localized molecular orbitals using group theory methods and its approach to the many-electron correlation problem. IV. The symmetry-adaptation of many-center integrals and hamiltonian matrix elements in MCSCF calculations (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Computational Chemistry 15 (1994), S. 858-865 
    Details
    ISSN: 0192-8651
    Keywords: Computational Chemistry and Molecular Modeling ; Biochemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Computer Science
    Notes: Group theoretic methods are presented for the transformations of integrals and the evaluation of matrix elements encountered in multiconfigurational self-consistent field (MCSCF) and configuration interaction (CI) calculations. The method has the advantages of needing only to deal with a symmetry unique set of atomic orbitals (AO) integrals and transformation from unique atomic integrals to unique molecular integrals rather than with all of them. Hamiltonian matrix element is expressed by a linear combination of product terms of many-center unique integrals and geometric factors. The group symmetry localized orbitals as atomic and molecular orbitals are a key feature of this algorithm. The method provides an alternative to traditional method that requires a table of coupling coefficients for products of the irreducible representations of the molecular point group. Geometric factors effectively eliminate these coupling coefficients. The saving of time and space in integral computations and transformations is analyzed. © 1994 by John Wiley & Sons, Inc.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcc.540150807
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