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  • 1
    Electronic Resource
    Electronic Resource
    Profile structure refinement of SrCl2.2D2O by neutron powder diffraction (1993)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 944-946 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270192011806
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  • 2
    Electronic Resource
    Electronic Resource
    Gröbner bases of ideals defined by functionals with an application to ideals of projective points (1993)
    Springer
    Applicable algebra in engineering, communication and computing 4 (1993), S. 103-145 
    Details
    ISSN: 1432-0622
    Keywords: Gröbner bases ; Polynomial ideals ; Dual bases ; Interpolation ; 0-dimensional schemes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract In this paper we study 0-dimensional polynomial ideals defined by a dual basis, i.e. as the set of polynomials which are in the kernel of a set of linear morphisms from the polynomial ring to the base field. For such ideals, we give polynomial complexity algorithms to compute a Gröbner basis, generalizing the Buchberger-Möller algorithm for computing a basis of an ideal vanishing at a set of points and the FGLM basis conversion algorithm. As an application to Algebraic Geometry, we show how to compute in polynomial time a minimal basis of an ideal of projective points.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01386834
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  • 3
    Electronic Resource
    Electronic Resource
    On decomposing systems of polynomial equations with finitely many solutions (1993)
    Springer
    Applicable algebra in engineering, communication and computing 4 (1993), S. 217-230 
    Details
    ISSN: 1432-0622
    Keywords: Algebraic variety decomposition ; Gröbner bases ; Systems of nonlinear equations
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science , Mathematics , Technology
    Notes: Abstract This paper deals with systems ofm polynomial equations inn unknown, which have only finitely many solutions. A method is presented which decomposes the solution set into finitely many subsets, each of them given by a system of type $$f_1 \left( {x_1 } \right) = 0,f_2 \left( {x_1 ,x_2 } \right) = 0, \ldots ,f_n \left( {x_1 , \ldots ,x_n } \right) = 0$$ . The main tools for the decomposition are from ideal theory and use symbolical manipulations. For the ideal generated by the polynomials which describe the solution set, a lexicographical Gröbner basis is required. A particular element of this basis allows the decomposition of the solution set. By a recursive application of these decomposition techniques the triangular subsystems are finally obtained. The algorithm gives even for non-finite solution sets often also usable decompositions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01200146
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  • 4
    Electronic Resource
    Electronic Resource
    Water turnover of healthy children measured by deuterated water elimination (1993)
    Springer
    European journal of pediatrics 152 (1993), S. 110-114 
    Details
    ISSN: 1432-1076
    Keywords: Deuterium oxide ; Water turnover ; Fluid intake
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract For healthy children up to 15 years of age, no data exist regarding water turnover as directly measured using stable isotope techniques. Water turnover was measured in 171 healthy children (88 girls, 83 boys, age: 6 weeks–15 years) whilst living in their normal environment. Water turnover was calculated from the equilibrium of2H2O concentration reached in the urine 2–3 h after an oral test load of 2 ml2H2O/kg and the subsequent elimination rate of2H2O. Daily water turnover decreased from 160 ml/kg (3 months), 100 ml/kg (12 months), 65 ml/kg (3 years) to 40 ml/kg at 15 years of age. Fluid intake was then calculated by subtracting the estimated metabolic water production from water turnover and this data was compared with recommended values. Our calculation of spontaneous daily fluid intake for these healthy children is within the recommended range during the 1st year of life, whereas for older children the recommendations exceed the spontaneous intake by a factor of 1,2–2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02072485
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  • 5
    Electronic Resource
    Electronic Resource
    White matter abnormalities in patients with treated hyperphenylalaninaemia: Magnetic resonance relaxometry and proton spectroscopy findings (1993)
    Springer
    European journal of pediatrics 152 (1993), S. 1012-1020 
    Details
    ISSN: 1432-1076
    Keywords: Phenylketonuria ; Myelination ; Magnetic resonance imaging ; 1H spectroscopy ; T2 relaxometry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In order to further clarify the pathogenesis and clinical significance of MRI white matter abnormalities in treated hyperphenylalaninaemia (HPA), ten patients (seven type I HPA, two type II and one type III) underwent T2 relaxometry (n=8) and/or1H spectroscopy (n=7) in addition to conventional MR spin-echo imaging at 1.5 T. Two patients with severe MRI abnormalities had repeat examinations during and after a 6-to 8-month period of strict diet control. The clinical evaluation included a detailed neurological examination. In nine out of ten patients visual evoked potentials (VEP) were obtained parallel to the MR examination. MR imaging demonstrated typical symmetrical areas of prolonged T2 relaxation time predominantly in the posterior periventricular white matter in all but one of type I and II patients. There was no consistent relationship between MRI findings and time of diagnosis/initiation of therapy, IQ or visual evoked potential changes. MRI abnormalities tended to be more severe in patients with poor dietary control and high current plasma phenylalanine levels, whereas a normal MRI was found only in patients with plasma phenylalanine levels continuously below 0.36 mmol/l. There was marked regression of MRI abnormalities already after 3 months of strict diet control. T2 relaxometry showed a bi-exponential behaviour of T2 in the affected white matter, with a slow component of about 200–450 ms, indicating an increase in free (extracellular) water.1H spectroscopy revealed no signs of severe neuronal damage. We conclude, that the observed white matter changes in treated HPA probably represent reversible structural myelin changes rather than permanent demyelination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01957228
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  • 6
    Electronic Resource
    Electronic Resource
    Prediction of short-term outcome of neurotic-depressive inpatients (1993)
    Springer
    European archives of psychiatry and clinical neuroscience 242 (1993), S. 301-309 
    Details
    ISSN: 1433-8491
    Keywords: Neurotic Depression ; Short-term Outcome ; Predictors ; Cognitive Behaviour Therapy ; Antidepressants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A study was carried out involving 134 neurotic-depressive inpatients (according to ICD-9) treated with cognitive behaviour therapy and in a subgroup additionally with antidepressants. Using standardized rating instruments, a large set of potential predictor variables was tested. After cross-validation according to the splithalf technique, only very few of these proved to be suitable as predictors for the main outcome criteria. These predictors included certain aspects of social functioning before index admission, intensity of depressive symptoms at admission and the degree of self-evaluated mood disturbances three weeks after admission. Several predictors known from the literature could not be reproduced in this study, demonstrating the well-known instability of most predictor findings. On the other side, the predictor profile of the neurotic-depressive patients was quite similar to that found in endogenous depressives, a result which might — together with other findings, such as the response of neurotic depressives to antidepressants — question the traditional subclassification of functional depressive states into these subgroups.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02190390
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  • 7
    Electronic Resource
    Electronic Resource
    Gitterschwingungsspektren. LXXVI. Zur Kenntnis basischer Kupfersalze  -  Kristallstruktur und schwingungsspektroskopische Untersuchungen an Cu2(OH)3NO2Professor Dietrich Mootz zum 60. Geburtstage gewidmet (1993)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 619 (1993), S. 1287-1294 
    Details
    ISSN: 0044-2313
    Keywords: Dicopper trihydroxide nitrite ; crystal structure ; i.r., Raman spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Lattice Vibration Spectra. LXXVI. On Basic Copper Salts  -  Crystal Structure, IR and Raman Spectra of Cu2(OH)3NO2Single-crystal X-ray as well as IR and Raman data of Cu2(OH)3NO2 are presented and discussed with respect to an order-disorder (OD) phase transition and the strength of hydrogen bonds. Cu2(OH)3NO2 crystallizes pseudosymmetrically in the monoclinic space group P21/m (Z = 2, a = 562.22(4), b = 605.94(5), c = 663.55(4) pm and β = 95.415(5)°) forming a layered structure of edge-connected, elongated CuO6 octahedra (final R value 2.5% for 1047 symmetry averaged reflections with I ≥ 2.5 μ1). The NO2- ions are on a split position with dynamic disordering at ambient temperature. On temperature lowering the disorder is frozen out with a symmetry decrease to space group P21. The disorder of the NO2- ions causes four different arrangements of OH(2)- with different strengths of the H…O hydrogen bonds present OD stretching modes in the spectra of isotopically dilute samples 2628, 2535, 2435, and 2343 cm-1 at 90 K. The OH(1)- ions form weak H…N H-bonds to the lone-pair of the nitrogen atoms of the NO2- ions (vOD 2563 cm-1).
    Notes: Die Kristallstruktur sowie die IR- und Raman-Spektren von Cu2(OH)3NO2 werden mitgeteilt und im Hinblick auf eine Ordnungs-Unordnungs(OD)-Phasenumwandlung sowie die Stärke der vorhandenen Wasserstoffbrücken diskutiert. Das basische Nitrit kristallisiert pseudosymmetrisch in der monoklinen Raumgruppe P21/m (Z = 2, R = 2,5%, 1047 symmetriegemittelte Reflexe mit 1 〉 2,5 μ1). Cu2(OH)3NO2 bildet eine Schichtenstruktur kantenverknüpfter, gestreckter CuO6-Oktaeder. Die Nitritionen befinden sich auf einer Splitlage mit dynamischer Fehlordnung bei Raumtemperatur. Bei niedrigeren Temperaturen friert die Fehlordnung unter Bildung von NO2--Zick-Zack-Ketten und Symmetrieerniedrigung zu P21 aus. Aufgrund der Fehlordnung der NO2--Ionen ergeben sich für die OH(2)--Ionen vier verschiedene Anordnungen mit entsprechend unterschiedlich starken H-Brücken (H…O). Die OH(1)--Ionen bilden H…N-Wasserstoffbrücken zum freien Elektronenpaar des N-Atoms der NO2--Ionen.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19936190723
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