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  • 1
    Title: Algorithms - ESA 2011 /; 6942
    Contributer: Demetrescu, Camil , Halldórsson, Magnus M. , ESA 〈19, 2011, Saarbrücken〉
    Publisher: Berlin [u.a.] :Springer,
    Year of publication: 2011
    Pages: XIX, 813 S. : , graph. Darst.
    Series Statement: Lecture notes in computer science 6942
    ISBN: 3-642-23718-5 , 978-3-642-23718-8
    Type of Medium: Book
    Language: English
    Parallel Title: Online Ausgabe - Algorithms - ESA 2011
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 39 (1991), S. 1738-1742 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 35 (1987), S. 644-649 
    ISSN: 1520-5118
    Source: ACS Legacy Archives
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1460-9568
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We have examined whether the Semliki Forest virus (SFV) expression vector can be used to manipulate the exocytotic machinery in cultured hippocampal neurons. Autaptic responses were recorded in individually identified neurons which overexpressed either a non-synaptic protein, the transferrin receptor, or the synaptic SNARE protein SNAP-25 (synaptosomal-associated protein of 25 kDA). In neurons overexpressing the transferrin receptor, autaptic responses occurred in a similar proportion and had similar amplitudes (12–18 h postinfection) as in uninfected control neurons. With increasing time after the infection, an increasing proportion of the transferrin receptor-overexpressing neurons showed changes in the shape of the cell body, but the autaptic responses appeared normal as long as recordings could be performed (up to 30 h postinfection). In contrast, in SNAP-25-overexpressing neurons, the proportion of responding cells was reduced 12–18 h after the infection, and the amplitude of the autaptic current in responding neurons was also reduced. The sensitivity to exogenously applied glutamate was, however, unchanged. Biochemical analysis showed that 50% of the overexpressed SNAP-25 was palmitoylated. The levels of two other SNAREs, syntaxin and synaptobrevin (also called vesicle-associated membrane protein), were not affected. Our results indicate that the SFV vector can provide an effective tool to study the function of proteins participating in neurotransmitter release.
    Type of Medium: Electronic Resource
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  • 5
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    Unknown
    Wiesbaden, etc. : Periodicals Archive Online (PAO)
    Hermes. 40 (1905) 191 
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    BIT 32 (1992), S. 180-196 
    ISSN: 1572-9125
    Keywords: F.2.2 ; G.2.2 ; Approximation algorithms ; independent sets ; graph coloring
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract An approximation algorithm for the maximum independent set problem is given, improving the best performance guarantee known toO(n/(logn)2). We also obtain the same performance guarantee for graph coloring. The results can be combined into a surprisingly strongsimultaneous performance guarantee for the clique and coloring problems. The framework ofsubgraph-excluding algorithms is presented. We survey the known approximation algorithms for the independent set (clique), coloring, and vertex cover problems and show how almost all fit into that framework. We show that among subgraph-excluding algorithms, the ones presented achieve the optimal asymptotic performance guarantees.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Chirality 7 (1995), S. 272-277 
    ISSN: 0899-0042
    Keywords: local anaesthetics ; enantiomers ; stereoselective ; liquid chromatography ; Chiral AGP column ; bioanalysis ; urine samples ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ropivacaine hydrochloride monohydrate (ropivacaine) is a new local anaesthetic agent which is administered exclusively as the (-)-(S)-form. The aim of the study was to determine whether metabolic racemisation of (-)-(S)-ropivacaine occurs. This was tested in man, rat, dog, and sheep after different routes of administration. The enantiomers of ropivacaine and two of the major metabolites, 3-hydroxy-ropivacaine and 2′,6′-pipecoloxylidide (PPX), were determined in urine samples by liquid chromatography on a Chiral AGP column after liquid-liquid extraction. It was possible to detect 〈1% of the (+)-(R)-enantiomer of both ropivacaine and the two major metabolites. In the samples examined, no trace of metabolic racemisation was observed. In pharmacokinetic, pharmacodynamic, toxicological, and metabolic studies, therefore, nonchiral assays are considered to be adequate. © 1995 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 299 (1959), S. 122-137 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The reactions between hydrogen sulfite and hydroxylamine-N-monosulfonate or -N-disulfonate are branched ones, yielding about 70% imidodisulfonate and 30% amidosulfonate or 70% nitridotrisulfonate and 30% imidodisulfonate.The reaction velocities are proportional to the concentrations of sulfonate and hydrogen sulfite.The activation energies in the temperature range from 25 to 60°C are 24.5 and 18.0 kcals/mol, the A-factors are 1.2 · 1015 and 4.3 · 1011 1/mol · min, respectively. Osulfinic acids are assumed to be intermediate products.
    Notes: Die Umsetzungen von Hydroxylamin-N-monosulfonat und -N-disulfonat mit Hydrogensulfit sind gegabelte Reaktionen, die zu etwa 70% zu Imidodisulfonat bzw. Nitridotrisulfonat und zu 30% zu Amidosulfonat bzw. Imidodisulfonat führen. Die Geschwindigkeit des Stoffumsatzes ist proportional der Konzentration des Sulfonats und des Hydrogensulfits. Die ARRHENIUsschen Aktivierungsenergien im Temperaturbereich von 25 bis 60°C sind 24,5 bzw. 18,0 kcal/Mol, die A-Faktoren 1,2 · 1015 bzw. 4,3 · 1011 1/Mol · min. Wahrscheinlich sind Zwischenprodukte der Umsetzungen O-Sulfinsäuren, deren innermolekulare Umlagerung und Hydrolyse die Reaktionsgabelung verursachen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Biological Mass Spectrometry 13 (1986), S. 287-291 
    ISSN: 1052-9306
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: As part of our efforts to characterize the in vivo metabolic fate of the antihypertensive agent α-methyldopa, we have examined the urine of α-methyldopa-treated rats with the aid of a direct insertion probe chemical ionization mass spectral assay. The mass spectrum of the sample obtained by chromatographic purification followed by treatment with ethanolic hydrochloric acid and pentafluoropropionic anhydride displayed an intense ion at m/z 812, consistent with the β-ethoxy-N,O,O,O-tetrakispentafluoropropionyl derivative of 6-hydroxy-α-methyl-norepinephrine, a potential aromatic hydroxylation product of the known α-methyldopa metabolite α-methyl-norepinephrine. Comparison of this spectrum with the spectrum obtained with the corresponding synthetic 6-hydroxy-α-methylnorepinephrine, however, ruled out this possibility. A more thorough examination of the mass spectral data established that the ion at m/z 812 observed with the metabolic species was due to the formation of an unexpected adduct ion between a known metabolite of α-methyldopa and an impurity ion formed from a common constituent of urine. This paper summarizes the characterization of this adduct ion.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0269-3879
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: A gas chromatographic-mass spectrometric (GC/MS) method for analysis of Δ1-tetrahydrocannabinol (Δ1-THC) in human fat samples is described. The fat sample, obtained from heavy marihuana users 1 week before and 4 weeks after smoking, is homogenized in hexane + 2-propanol, centrifuged, and the supernatant mixed with Lipidex 5000. The solvent is evaporated and the dried gel is packed in a glass column. Δ1 -THC is eluted from the column with methanol + water + acetic acid, diluted with water and the eluent is passed through a bed of Octadecylsilanebonded silica. After washing and drying, the retained Δ1-THC is eluted with hexane, derivatized with N-methyl-N-(t-butyl-dimethysilyl)trifluoroacetamide (MTBSTFA) and finally purified by HPLC on an Octadecyl SI 100 column in methanol. The amount of Δ1-THC is determined by GC/MS, using selected ion monitoring, and a deuterated internal standard. The recovery of Δ1-THC is about 80%, and the concentration of Δ1-THC in the fat samples analysed ranged between 0.4 and 193 ng/g wet tissue.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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