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  • 1
    Electronic Resource
    Electronic Resource
    Formation and identification of carcinogenic heterocyclic aromatic amines in boiled pork juice
    Amsterdam : Elsevier
    Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis 308 (1994), S. 77-88 
    Details
    ISSN: 0027-5107
    Keywords: Boiled pork juice ; Heterocyclic aromatic amines
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0027-5107(94)90200-3
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  • 2
    Electronic Resource
    Electronic Resource
    An ab initio molecular orbital study of the C"3H^+ potential energy surface
    Amsterdam : Elsevier
    Journal of Molecular Structure: THEOCHEM 184 (1989), S. 391-397 
    Details
    ISSN: 0166-1280
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0166-1280(89)85107-3
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  • 3
    Electronic Resource
    Electronic Resource
    Quantum Mechanical Repulsion of Filled Orbitals in the Basic Hydrolysis of Octahedral Complexes (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 815-816 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The stereochemical aspects of the quantum mechanical interaction between the filled non-a-bonded p orbitals of the amido and the outgoing ligands and the filled dxy type orbitals of the central cobalt atom in octahedral systems are shown in Figs. 1 and 2. In both figures, the full lines represent ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212815a0
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  • 4
    Electronic Resource
    Electronic Resource
    A survey of multiple sequence comparison methods (1992)
    Springer
    Bulletin of mathematical biology 54 (1992), S. 563-598 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract Multiple sequence comparison refers to the search for similarity in three or more sequences. This article presents a survey of the exhaustive (optimal) and heuristic (possibly sub-optimal) methods developed for the comparison of multiple macromolecular sequences. Emphasis is given to the different approaches of the heuristic methods. Four distance measures derived from information engineering and genetic studies are introduced for the comparison between two alignments of sequences. The use ofentropy, which plays a central role in information theory as measures of information, choice and uncertainty, is proposed as a simple measure for the evaluation of the optimality of an alignment in the absence of anya priori knowledge about the structures of the sequences being compared. This article also gives two examples of comparison between alternative alignments of the same set of 5SRNAs as obtained by several different heuristic methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02459635
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  • 5
    Electronic Resource
    Electronic Resource
    A multiple sequence comparison method (1993)
    Springer
    Bulletin of mathematical biology 55 (1993), S. 465-486 
    Details
    ISSN: 1522-9602
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Mathematics
    Notes: Abstract This article presents a new method for the comparison of multiple macromolecular sequences. It is based on a hierarchical sequence synthesis procedure that does not require anya priori knowledge of the molecular structure of the sequences or the phylogenetic relations among the sequences. It differs from the existing methods as it has the capability of: (i) generating a statistical-structural model of the sequences through a synthesis process that detects homologous groups of the sequences, and (ii) aligning the sequences while the taxonomic tree of the sequences is being constructed in one single phase. It produces superior results when compared with some existing methods.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02460892
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  • 6
    Electronic Resource
    Electronic Resource
    A Next Generation NC Machining System Based on NC Feature Unit and Real-Time Tool-Path Generation (2000)
    Springer
    The international journal of advanced manufacturing technology 16 (2000), S. 889-901 
    Details
    ISSN: 1433-3015
    Keywords: Keywords: Computer numerical control; numerical control programming; NC Feature Unit; Tool Path
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In order to improve the control and information integration capability of an NC machining system, this paper provides a new concept – an NC feature unit (NCFU), which is a feature-based and a basic control unit. First, as a feature-based control unit, NCFU possesses geometric form and control parameters, which are a subclass of high-level CAD/CAM features so that it can be used as an information exchange medium between NC machining systems and other manufacturing execution systems. Secondly, as a basic machining control unit, NCFU uses a geometrically defined closed and non-gouging machined area. On the one hand, through decompo-sition, a machined object can be divided into a combination of several NCFUs. On the other hand, since NCFUs are non-gouging, the algorithm for NCFU-based tool-path generation is simple enough to be executable in real-time. This paper discusses NCFU-based applications in 2.-D profile/pocket and 3D surface mill machining, including the NCFU definition and the related algorithms for decomposition calculation and area interpolation. A next generation NC machining system based on NCFU, including an NCFU-based NCP and an NCFU-based CNC system, has been prototyped by China’s State 863/CIMS Design Automation Laboratory in Beijing University of Aeronautics and Astronautics. An NCFU is being used as the information exchange medium in an internet-integrated manufacturing system with NC machining at Hong Kong Polytechnic University.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001700070007
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  • 7
    Electronic Resource
    Electronic Resource
    Artificial Intelligence research at the National University of Singapore (1990)
    Springer
    Artificial intelligence review 4 (1990), S. 21-37 
    Details
    ISSN: 1573-7462
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper reports three on-going research projects in Artificial Intelligence (AI) at the National University of Singapore. These three projects are (a) designing an expert system for computer performance monitoring, (b) machine translation projects involving three common languages in Singapore and (c) neural network systems providing an alternative to conventional computing to solve AI problems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02221494
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  • 8
    Electronic Resource
    Electronic Resource
    Long-term changes in hydrography, nutrients and phytoplankton in Tolo Harbour, Hong Kong (1997)
    Springer
    Hydrobiologia 352 (1997), S. 107-115 
    Details
    ISSN: 1573-5117
    Keywords: coastal waters ; nutrients ; phytoplankton
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper presents the results of a long-term survey of the hydrography, nutrients and phytoplankton in Tolo Harbour carried out between 1982 and 1992. Some nutrients such as total inorganic nitrogen, ammonia and total phosphorus increased during the 10 year period, but chlorophyll a, which indicated algal biomass, did not show an increasing trend. The phytoplankton of Tolo Harbour consisted largely of diatoms. Dinoflagellates and minor algal groups such as cryptomonads and small flagellates constituted a smaller fraction of the phytoplankton population. Densities of diatoms and minor algal groups increased in some stations, but the density of dinoflagellates remained relatively unchanged during the study period. Most nutrient variables were negatively correlated with densities of diatom and total phytoplankton, and positively correlated with densities of minor algal groups. While dinoflagellate densities were positively correlated with total nitrogen in some stations, no correlation existed between dinoflagellate density and most of the nutrient variables. Our results show that there is a gradual change in phytoplankton community in Tolo Harbour,most notably in the nutrient-rich inner harbour waters, with the smaller algae assuming increasing abundance. Thus there was a net increase in density of total phytoplankton even though chlorophyll a concentrations did not increase. No evidence was found in this study to show that increased nutrient loading would inevitably lead to increase in densities of dinoflagellates in Tolo Harbour. Instead, dinoflagellate densities showed stronger correlations with physical variables such as temperature, pH and salinity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003021831076
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  • 9
    Electronic Resource
    Electronic Resource
    Octahedral cobalt (III) complexes of the chloropentammine type. XXXII. Cis-[Coen2 (n-CxH2x+1NH2)Cl]2+ Complexes Containing Long Paraffinic Chains (1974)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 404 (1974), S. 87-96 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Oktaedrische Kobalt(III)-Komplexe vom Chloropentammin-Typ. XXXII. Cis-[Coen2(n-CxH2x+1NH2)Cl]2+- Komplexe mit langen Paraffin-KettenSalze von cis-[Coen2(n-CxH2x+1NH2)Cl]2+-Kationen (x = 4 bis 12) wurden dargestellt und ihre VIS- und IR-Spektren aufgenommen. Die Geschwindigkeits-konstanten der Solvolyse wurden bestimmt und die Aktivierungsparameter berechnet. Die spektralen und kinetischen Daten werden kurz diskutiert.
    Notes: Salts of the cis-[Coen2(n-CxH2x+1NH2)Cl]2+ cations where x = 4-12 have been prepared, and their visible and infrared spectra measured. Rate constants for their solvolysis have been determined over a range of temperatures and activation parameters calculated. These spectral and kinetic data are briefly discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19744040108
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  • 10
    Electronic Resource
    Electronic Resource
    Octahedral cobalt(III) complexes of the chloropentammine type. XVII. Association and reaction of some halogenopentamminecobalt(III) and halogenopentamminechromium(III) cations with hydroxide in aqueous dioxan (1970)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 372 (1970), S. 345-352 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Es wurde die Substitution von Halogenid durch Hydroxid bei einigen Halogenopentamminkobalt(III)- und -chrom(III)-Kationen in wäßrigem Dioxan bei Alkalikonzentrationen bis zu 0.1 M untersucht. Bei überschüssigem OH- (konstante Ionenstärke) wurden Geschwindigkeitskonstanten nach scheinbar erster Ordnung ermittelt. Es ist eine dem Gleichgewicht vorgelagerte Ionenpaar-Assoziation angezeigt, wobei aber nicht über die Art der Weiterreaktion des Ionenpaares - Direktaustausch oder Protonenabzug - entschieden werden kann. Bei CoIII ist die Ionenpaarbildung Stärker als bei CrIII; sie nimmt mit steigendem Dioxangehalt zu.
    Notes: The replacement, by hydroxide ion, of the coordinated halide from some halogenopentamminecobalt(III) and -Chromium(III) cations in aqueous dioxan has been studied over a range of alkali concentrations up to 0.1 M. With excess of hydroxide ion at constant ionic strength, pseudo first-order rate constants were obtained. The results support a pre-equilibrium association of complex and hydroxide ions in these media, but do not provide distinction as to whether the resulting ion-pair subsequently reacts by direct exchange or by proton removal. The extents of ion association are found to be greater for the cobalt(III) than for the chromium(III) system, increasing with the amount of dioxin in the solvent mixture.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19703720312
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