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  • 1995-1999  (7)
  • 1970-1974  (5)
  • 1965-1969  (37)
  • 1945-1949  (2)
  • 11
    Electronic Resource
    Electronic Resource
    On an implementation of standard bases and syzygies in SINGULAR (1996)
    Springer
    Applicable algebra in engineering, communication and computing 7 (1996), S. 235-249 
    Details
    ISSN: 1432-0622
    Keywords: Standard bases ; Syzygies ; Computer algebra system ; Highest corner ; EcartMethod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract We describe an implementation of a general standard basis algorithm, valid for any monomial ordering compatible with the natural semigroup structure. We concentrate on new strategies which have proved useful, in particular in the non-wellordering case. Moreover, we describe the first implementation of Schreyer's method to compute syzygies and compare it with other, more classical methods. Comparisons of the computing time of several examples in the system SINGULAR give hints as to which strategies should be used in different classes of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190332
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  • 12
    Electronic Resource
    Electronic Resource
    On an Implementation of Standard Bases and Syzygies in SINGULAR (1996)
    Springer
    Applicable algebra in engineering, communication and computing 7 (1996), S. 235-249 
    Details
    ISSN: 1432-0622
    Keywords: Key words Standard bases ; Syzygies ; Computer algebra system ; Highest corner ; EcartMethod.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract  We describe an implementation of a general standard basis algorithm, valid for any monomial ordering compatible with the natural semigroup structure. We concentrate on new strategies which have proved useful, in particular in the non-wellordering case. Moreover, we describe the first implementation of Schreyer’s method to compute syzygies and compare it with other, more classical methods. Comparisons of the computing time of several examples in the system SINGULAR give hints as to which strategies should be used in different classes of examples.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01190332
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    Paper (German National Licenses)
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  • 13
    Electronic Resource
    Electronic Resource
    Tolerance of Phenylalanine after Intravenous Administration in Phenylketonurics, Heterozygous Carriers, and Normal Adults (1966)
    [s.l.] : Nature Publishing Group
    Nature 209 (1966), S. 1148-1149 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The purpose of the investigation described in this communication was to estimate the rate of elimination of phenylalanine from the blood. We tested seventeen healthy adults, nine heterozygotes, and six phenylketonurics. First we obtained a fasting specimen of capillary blood by means of a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/2091148a0
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  • 14
    Electronic Resource
    Electronic Resource
    High-resolution analytical transmission electron microscopy of semiconductor quantum structures (1999)
    Springer
    Fresenius' journal of analytical chemistry 365 (1999), S. 217-220 
    Details
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Analytical transmission electron microscopy was applied to characterize the size, shape, real structure, and, in particular, the composition of different semiconductor quantum structures. Its potential applicability is demonstrated for heterostructures of III-V semiconducting materials and II-VI ones, viz. (In,Ga)As quantum wires on InP and (In,Ga)As quantum dots on GaAs both grown by metal organic chemical vapor deposition, and CdSe quantum dots on ZnSe grown by molecular beam epitaxy. The investigations carried out show that the element distribution even of some atomic layers can be detected by energy-dispersive X-ray spectroscopy, however, exhibiting a smeared profile. Contrary to that, sub-nanometre resolution has been achieved by using energy-filtered transmission electron microscopy to image quantum dot structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002160051476
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  • 15
    Electronic Resource
    Electronic Resource
    Bindung per os aufgenommener Gifte durch antidote und Antidotgemische (1966)
    Springer
    Naunyn-Schmiedeberg's archives of pharmacology 253 (1966), S. 76-77 
    Details
    ISSN: 1432-1912
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00259284
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  • 16
    Electronic Resource
    Electronic Resource
    Pyridoxin-abhängige Veränderungen im chemischen Aufbau der Hyphen vonNeurospora sitophila (1968)
    Springer
    Archives of microbiology 61 (1968), S. 30-39 
    Details
    ISSN: 1432-072X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Zusammenfassung Neurospora sitophila 299 (pyridoxinbedürftig) zeigt mit steigendem Angebot an Pyridoxol · HCl im Medium statistisch gesicherte Zunahmen an Protein, Zellwandsubstanzen (einschließlich Chitin) und Asche sowie Abnahmen an RNA und DNA. Der Lipidgehalt ist vom Pyridoxolangebot unabhängig. Der Durchmesser der Hyphen ist im Pyridoxinmangel statistisch signifikant größer als bei ausreichenden Gaben. Bei elektronenmikroskopischer Betrachtung gibt es keinen Anhalt für Pyridoxin-induzierte Veränderungen der Zellwandstärke.
    Notes: Summary With rising concentrations of pyridoxine in culture mediumNeurospora sitophila 299 (pyridoxineless) shows a significant increase of the relative amounts of protein, cell wall substances (incl. chitin), and ash, and a decrease of RNA and DNA. The lipid contents remain unchanged. The diameters of pyridoxine deficient hyphae are significantly greater than those of normal hyphae. Electron microscopic examination shows that B6-deficient cells do not contain a thinner or thicker than normal cell wall layer external to the membrane.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704289
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  • 17
    Electronic Resource
    Electronic Resource
    Phenylalanin-Toleranz bei Frühgeborenen, reifen Neugeborenen, Säuglingen und Erwachsenen (1966)
    Springer
    Journal of molecular medicine 44 (1966), S. 1076-1081 
    Details
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary 1. The phenylalanine tolerance was estimated after intravenous injection of L-phenylalanine in premature newborns, mature newborns, infants and normal adults. The elimination of phenylalanine from the blood followed the pattern of a monomolecular reaction. The rate of elimination was, therefore, chosen for the comparison of the degree of tolerance. 2. The tolerance of phenylalanine was markedly reduced in most of the prematures; the same was found in some of the mature newborn infants. Compared with the tolerance in adults there was no decrease of phenylalanine tolerance in most of the mature newborns and in all infants. 3. The relation of phenylalanine tolerance to the activity of phenylalanine hydroxylase and to the development of the phenylalanine hydroxylase system was discussed.
    Notes: Zusammenfassung 1. Die Phenylalanin-Toleranz wurde vergleichend bei Frühgeborenen, reifen Neugeborenen, Säuglingen und Erwachsenen bestimmt. Die Untersuchung erfolgte nach intravenöser Injektion von L-Phenylalanin. Die Elimination von Phenylalanin aus dem Blut erfolgte entsprechend einer Exponentialfunktion. Zur Beurteilung des Toleranzgrades wurde die Eliminationshalbwertszeit gewählt. 2. Die Phenylalanin-Toleranz war bei den meisten Frühgeborenen herabgesetzt. Bei reifen Neugeborenen kamen Toleranzverminderungen vor; sie waren jedoch wesentlich seltener. Die meisten Neugeborenen und alle Säuglinge zeigten eine Phenylalanin-Toleranz, die der beim normalen Erwachsenen entspricht. 3. Es werden die Beziehungen diskutiert, die zwischen der Phenylalanin-Toleranz und der Aktivität der Phenylalaninhydroxylase bestehen, und es wird auf die bei neonatalen Tieren beobachteten Aktivitätsverminderung des Phenylalaninhydroxylase-Systems hingewiesen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01716309
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  • 18
    Electronic Resource
    Electronic Resource
    Experimental results on muon-catalyzed dt fusion (1996)
    Springer
    Hyperfine interactions 101-102 (1996), S. 67-80 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A comprehensive experimental study of the kinetics of muon-catalyzed dt fusion has been conducted at PSI, based on the measurement of the 14 MeV neutrons from the fusion process. The target conditions included densities from 1–150% of the atomic density of liquid hydrogen, relative tritium concentrations of 2–95%, and temperatures of 13–300 K. Information about the dt cycle has been obtained from the measured neutron time distributions by different methods: Monte Carlo simulations primarily aimed at investigating epithermal effects in molecular formation and the determination and interpretation of cycling rates describing the steady state regime.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02227607
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  • 19
    Electronic Resource
    Electronic Resource
    Zum induzierten Zerfall von unsymmetrischen Acylperoxiden (1967)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 79 (1967), S. 1006-1006 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19670792277
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  • 20
    Electronic Resource
    Electronic Resource
    Eine vielseitige Methode zur Darstellung C-deuterierter VerbindungenHerrn Professor Fritz Kröhnke zum 65. Geburtstag gewidmet. (1968)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 80 (1968), S. 438-439 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19680801104
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