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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 93 (1981), S. 1-10 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es werden die Synthese und Eigenschaften eines Resacetophenon (2,4-Dihydroxiacetophenon)-Formaldehyd Harzes beschrieben. Das mittlere Molekulargewicht des Harzes, durch Dampfdruckosmometrie und wasserfreie konduktometrische Titration bestimmt, beträgt 2500 bzw. 2200 g/mol.Von diesem Harz wurden Cu(II)-, Ni(II)- und Co(II)-Chelate hergestellt. Die Elementaranalyse der Chelate ergab ein Verhältnis Metall : Ligand von 1:2. Aus den Reflexionspektren der Chelate konnte geschlossen werden, daß Ni(II)- und Co(II)-Chelate eine tetraedrische Struktur haben, während Cu(II)-Chelate eine quadratisch-ebene Struktur zeigen. Infrarotuntersuchungen zeigen, daß die Metalle über den Sauerstoff der Carbonyl-und Phenolgruppe gebunden sind. Auch die Anwesenheit von Methylenbrücken ist aus den IR-Messungen zu erkennen. Die thermischen Eigenschaften des Harzes und seiner Metallchelate werden diskutiert.
    Notes: Synthesis and properties of a resacetophenone-formaldehyde resin are described. The number average molecular weight of the resin determined by vapour pressure osmometry and nonaqueous conductometric titration is 2500 and 2200 g/mol, respectively.Cu(II), Ni(II) and Co(II) chelates of the resin were prepared. The elemental analysis of chelates indicated a metal to ligand ratio 1:2. From the diffuse reflectance spectra of the chelates it could be concluded that Ni(II) and Co(II) chelates have a tetrahedral structure while Cu(II) chelate has a square planar structure. Infrared spectral studies showed that the metals are co-ordinated through the oxygen of the carbonyl and phenolic groups. The presence of methylene bridges was also indicated from IR spectral studies. The thermal properties of the resin and its metal chelates are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 93 (1981), S. 11-17 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Resacetophenon-Formaldehyd-Harze erwiesen sich für verschiedene Metallionen als selektiv komplexierende Ionenaustauscherharze. Zur Bestimmung der Selektivität der Metallionenaufnahme wurde eine Gleichgewichts-batch-Methode angewandt. Die Methode beinhaltet die Messung der Verteilung eines gegebenen Metallions zwischen einer wäßrigen Lösung und dem Harz. Die Untersuchung wurde über einen weiten pH-Bereich und in Medien verschiedener Ionenstärke durchgeführt.
    Notes: The resacetophenone-formaldehyde (RAP-F) resin showed to be a selective chelating ion-exchange resin for certain metal ions. A batch equilibration method was used in the study of the selectivity of metal ion uptake. The method involved the measurement of distribution of a given metal ion between an aqueous solution and the resin. The study was carried out over a wide pH range and in media of various ionic strengths.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 105 (1982), S. 75-81 
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Resacetophenonoxim-Formaldehyd-Harze erwiesen sich für verschiedene Metallionen als selektiv komplexierende Ionenaustauscherharze. Zur Bestimmung der Selektivität wurde eine Gleichgewichts-batch-Methode angewandt. Die Methode beinhaltet die Messung der Verteilung eines gegebenen Metallions zwischen einer wäßrigen Lösung und dem Harz. Die Untersuchung wurde in einem weiten pH-Bereich und in Medien verschiedener Ionenstärke durchgeführt.
    Notes: Resacetophenoneoxime-formaldehyde resins showed to be selective chelating ion exchange resins for certain metal ions. A batch equilibrium method was used in the study of the selectivity of metal ion uptake. The method involved the measurement of distribution of a given metal ion between an aqueous solution and the resin. The study was carried out over a wide pH range and in media of various ionic strengths.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 20 (1982), S. 205-212 
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In this paper the synthesis and properties of resacetophenone oxime-formaldehyde resin are described. The number-average molecular weights of the resin determined by vapor-pressure osmometry and nonaqueous conductometric titration are 2200 ± 10% and 2500 g/mol, respectively. Cu(II), Ni(II), and Co(II) chelates of the resin were prepared. Elemental analysis of the chelates indicates a metal to ligand ratio of 1:2. The diffuse reflectance spectra and magnetic moments of Ni(II) and Co(II) chelates show tetrahedral structure, whereas Cu(II) chelate shows a square planar structure. Infrared spectral studies show that the metals are coordinated through the nitrogen of the oximino group and oxygen of the phenolic group. The presence of methylene bridges is also indicated by IR spectral studies. The thermal behavior of the resin and its metal chelates are also discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Diabetologia 27 (1984), S. 370-372 
    ISSN: 1432-0428
    Keywords: Type 2 diabetes ; HLA antigens ; Papua New Guinea ; diabetes genetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary HLA phenotypes were studied in 57 Type 2 (non-insulin-dependent) diabetic Papuan patients and the results compared with control subjects of the same Austronesian origin. An association was found between disease and BW62, a split antigen of B15, with corrected probability significant at the 5% level. The frequencies of B13 and BW22 were also increased in diabetic patients but the differences were not statistically significant. Although it has been postulated that Melanesian communities have protection against diabetes, they have a high frequency of BW62, which would imply, from the association found in this study, that susceptibility to Type 2 diabetes has yet to become manifest in them.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of neurochemistry 34 (1980), S. 0 
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Age-dependent changes in the oxidative metabolism in nonsynaptic and synaptic mitochondria from brains of 3, 12, and 24-month-old rats were investigated. When pyruvate and malate were used in conjunction as substrates, a significant reduction in State 3 respiration was observed in both mitochondrial populations from 12-and 24-month-old rats compared with 3-month-old animals. A similar age-dependent reduction in the oxidation of [1-11C]pyruvate was also observed in nonsynaptic and synaptic mitochondria from senescent rats. Pyruvate dehydrogenase complex activity (both active and total) was, however, not decreased in the two mitochondrial populations from brains of 3, 12, and 24-month-old rats. When DL-3-hydroxybutyrate plus malate were used as substrates, a decrease in State 3 respiration was observed only in synaptic mitochondria from 24-month-old rats compared with 3- month-old animals. Similarly, an age-dependent reduction in the oxidation of 3-hydroxy[3-11C]butyrate was also observed only in synaptic mitochondria from 12-and 24-month-old rats. However, a significant reduction in the activities of ketone body-metabolizing enzymes, namely, 3-hydroxybutyrate dehydrogenase, 3-ketoacid CoA transferase, and acetoacetyl-CoA thiolase was observed in both mitochondrlal populations from 12- and 24-month-old rats compared with 3 month-old animals. These findings show that specific alterations in oxidative metabolism occur in nonsynaptic and synaptic mitochondria from aging rats. The data also suggest that in addition to alterations in enzyme activities, permeability of anions (e.g. pyruvate) across the inner mitochondrial membrane may be altered in nonsynaptic and synaptic mitochondria from senescent animals.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial and engineering chemistry 21 (1982), S. 523-523 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 12 (1983), S. 0 
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Energy dispersive x-ray spectrometry (EDAX system), with scanning electron microscopy was used to detect diffusion of Zn from a source in human dentin and the system was tested for sensitivity and reproducibility. Sections of human teeth in which a ZnO-eugenol cement had been placed in a cavity in the dentin in vivo were prepared and x-ray microanalytical measurements carried out. We found that values of counts for Zn, Ca and P in the same field were linear up to a total counting time of 60 sec. We further found that reproducibility of values between repeat examinations of the same specimens on different days was excellent. The concentration of Zn in the dentin decreased exponentially with distance from source within the distance tested. We conclude that the system can be used to detect trace concentrations of Zn, and that accordingly the diffusion behavior of a variety of ions in dentin could be monitored.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 305 (1983), S. 784-787 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The results reported are based mainly on measurements with a small shower array which comprises four detectors; three lie on the circumference of a circle of 50 m radius with the fourth at the centre of the circle. The detectors are each 13.5m2xl.2m deep water-erenkov detectors. This array (B), ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    General relativity and gravitation 15 (1983), S. 777-783 
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A metric containing a parameterε(ε 2=1) has been obtained which represents a Kerr metric in the background of a static Einstein universe whenε is put equal to +1. The same metric will represent the external field of a mass embedded in a rotating Gödel universe whenε is set equal to −1.
    Type of Medium: Electronic Resource
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