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  • 1
    Electronic Resource
    Electronic Resource
    Fourier transform infrared observation of the vibrational spectrum of the H2SiCCH radical in Ar at 10 K (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8355-8364 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Fourier transform infrared study has resulted in the first observation of a vibrational spectrum of the nonplanar H2SiCCH radical produced by trapping the products of the vacuum ultraviolet photolysis of a mixture of SiH4 silane, and C2H2 acetylene, in an Ar matrix at ∼10 K. Two vibrational fundamentals have been observed, the ν3(a′), silicon–carbon stretching mode at 2055.6 cm−1 and the ν4(a′), hydrogen–silicon bending mode at 926.8 cm−1. The vibrational frequencies, relative intensities, and extensive measurements of D and 13C isotopic shifts are all in good agreement with the values predicted by new density functional theory calculations. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477498
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  • 2
    Electronic Resource
    Electronic Resource
    Fourier transform infrared observation of the ν1(σ) mode of linear SiCH in Ar at 10 K (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 3504-3508 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A Fourier transform infrared (FTIR) study of the products of the vacuum ultraviolet (VUV) photolysis of a mixture of silane (SiH4) and methane (CH4) trapped in solid Ar at ∼10 K has resulted in the first detection of the linear SiCH radical by means of its silicon–carbon stretching mode ν1(σ), which has been observed at 1010.4 cm−1. The results of extensive measurements of D and 13C isotopic shifts are in good agreement with the predictions of new ab initio calculations performed at the CCSD(T)/6-31G** (coupled cluster with single, double and partial inclusion of triple excitations) level, and confirm the identification of the linear SiCH radical. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.475748
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A New Acylated N-Glycosyl Lactam from Aristolochia contorta (1992)
    s.l. : American Chemical Society
    Journal of natural products 55 (1992), S. 1165-1169 
    Details
    ISSN: 1520-6025
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/np50087a001
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Purification, characterization, and primary structure of a chitinase from Pseudomonas sp. YHS-A2 (2000)
    Springer
    Applied microbiology and biotechnology 54 (2000), S. 397-405 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract A chitinase gene (chiA) from Pseudomonas sp. YHS-A2 was cloned into Escherichia coli using pUC19. The nucleotide sequence determination revealed a single open reading frame of chiA comprised of 1902 nucleotide base pairs and 633 deduced amino acids with a molecular weight of 67,452 Da. Amino acid sequence alignment showed that ChiA contains two putative chitin-binding domains and a single catalytic domain. Two proline-threonine repeat regions, which are linkers between catalytic and substrate-binding domains in some cellulases and xylanases, were also found. From E. coli, ChiA was purified 12.8-fold relative to the periplasmic fraction. The Michaelis constant and maximum initial velocity for p-nitrophenyl-N,N′-diacetylchitobiose were 1.06 mM and 44.4 μmol/h per mg protein, respectively. The purified ChiA binds not only to colloidal chitin but also to other substrates (avicel, chitosan, and xylan), but the binding affinity of avicel, chitosan, and xylan is around 10 times lower than that of colloidal chitin. The reaction of ChiA with colloidal chitin and chitooligosaccharides (trimer-hexamer) produced an end product of N,N′-diacetylchitobiose, indicating that ChiA is a chitobiosidase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530000408
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  • 5
    Electronic Resource
    Electronic Resource
    Alias analysis of pointers in Pascal and Fortran 90: Dependence analysis between pointer references (1996)
    Springer
    Acta informatica 33 (1996), S. 99-130 
    Details
    ISSN: 1432-0525
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract.  Vectorization and parallelization of programs written in languages where pointers are used is now a subject of increasing interest. The presence of pointers in programs, however, poses new problems to dependence analysis in vectorizing and parallelizing compilers which had been designed to target only at FORTRAN77 programs. In this paper, a new method to analyze dependencies between pointer references in Pascal is proposed, which can also be applied to Fortran 90. It is designed to handle programs with dynamic data structures, such as linear linked lists or trees, which are the most common use of pointers. The method divides into two stages. The first stage is a safe alias analysis which handles any kind of dynamic data structures. The second stage focuses on the specific data structures. It first detects linear linked lists, and then performs dependence analysis between pointer references to the same list. The paper also proposes ways to enhance the second stage. Tree structures are handled here. Loops which manipulate linked lists can now be considered for vectorization by the proposed analysis. Techniques to vectorize such loops are presented in this paper. Some of the proposed algorithms are implemented in V-Pascal, the automatic vectorizing Pascal compiler of our laboratory. The effectiveness of the vectorization of list operations is proved by an experiment on HITAC S-820/80.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002360050037
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    Paper (German National Licenses)
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