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  • 1
    Publication Date: 1962-05-01
    Description: In nine patients with various diseases and in two normal subjects, administration of acetylsalicylic acid (aspirin) in amounts of 3-4 Gm. per day produced a drop in serum iron. This drop could not be explained by chemical interference with the determination, by blood loss, impaired absorption or increased excretion of iron. In addition, it was shown that during administration of salicylates the survival time of the red cells was diminished. It is suggested that salicylates might produce anemia not only by gastrointestinal bleeding but also by interference with the metabolism of iron through some unknown mechanism.
    Print ISSN: 0006-4971
    Electronic ISSN: 1528-0020
    Topics: Biology , Medicine
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  • 2
    Publication Date: 2019-06-27
    Description: Inorganic thermochromatic material synthesis and utilization in display devices
    Keywords: CHEMISTRY
    Type: NASA-CR-86136
    Format: application/pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 4 (1970), S. 51-51 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 131 (1965), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Biochemical and Biophysical Research Communications 113 (1983), S. 982-989 
    ISSN: 0006-291X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 5 (1970), S. 146-152 
    ISSN: 1432-0827
    Keywords: Fluorides ; Bone ; Immobilisation ; Citrate ; Mineralization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé L'effet de l'ingestion de fluor chez le rat, sous la forme de fluorure de sodium (NaF) et de monofluorophosphate de sodium (Na2PO3F), est étudié au niveau de tibias immobilisés à l'aide de résine acrylique. Après 4 semaines d'immobilisation, des humérus intacts et des tibias immobilisés et non-immobilisés sont étudiés en ce qui concerne l'épaisseur osseuse, la gravité spécifique et le contenu en citrate, cendre, calcium, phosphore et fluor. Nos travaux reconfirment les résultats antérieurs démontrant que l'administration de fluor augmente la minéralisation osseuse et compense ainsi la diminution de son épaisseur, de son contenu en cendres et de sa gravité spécifique, provoquée par l'atrophie osseuse, sans modifier le rapport Ca/P des cendres. L'augmentation de l'épaisseur osseuse est plus marquée chez les rats traités au Na2PO3F, malgré une incorporation fluorée moindre. Le contenu en cendre est plus faible au niveau des os des rats traités au NaF que dans ceux traités au Na2PO3F et ceux des témoins non fluorés. Des recherches ultérieures sont nécessaires pour étudier les avantages du Na2PO3F.
    Abstract: Zusammenfassung Die Wirkung von Fluorideinnahmen entweder in Form von Natriumfluorid (NaF) oder von Natriummonofluorophosphat (Na2PO3F) wurde bei Ratten verfolgt, indem der Tibiaknochen durch Anwendung von Acrylharz immobilisiert wurde. Nach 4 Wochen der Immobilisation wurden die unbehandelten Humeri und die nicht-immobilisierten und die immobilisierten Tibiae in folgender Hinsicht untersucht: Knochendicke, spezifisches Gewicht, Zitrat-, Asche-, Calcium-, Phosphor- und Fluoridgehalt. Die Resultate bestätigen frühere Befunde: die Fluoridgabe erhöht die Mineralisations-geschwindigkeit der Knochen und wirkt im atrophischen Knochen gegen die Abnahme der Knochendicke, des Aschegehaltes und des spezifischen Gewichts, ohne daß dadurch das Ca/P-Verhältnis der Asche verändert wird. Die Zunahme der Knochendicke war bei Na2PO3F-behandelten Ratten ausgeprägter, obwohl weniger Fluorid eingebaut wurde. Der Zitratgehalt war in den Knochen der mit NaF behandelten Ratten niedriger als in jenen von Tieren, die Na2PO3F erhielten oder die fluoridfrei gehalten wurden. Die erheblichen Vorteile des Na2PO3F rechtfertigen ausgedehntere Forschungen in dieser Richtung.
    Notes: Abstract The effect of fluoride intake in rats as sodium fluoride (NaF) and sodium monofluorophosphate (Na2PO3F) on immobilization of the tibial bone was investigated. After 4 weeks of immobilization intact humeri and non-immobilized and immobilized tibiae were examined for bone thickness, specific gravity, citrate, ash, and calcium, phosphorus and fluoride contents. The results confirm previous findings that administration of fluoride increases the mineralization rate of bones and counteracts the decrease in bone thickness,ash content and specific gravity induced by immobilization, without changing the Ca/P ratio of the ash. The increase in bone thickness was more marked in the Na2PO3F treated rats, in spite of a lower fluoride incorporation. The citrate content was lower in the bones of the NaF-treated rats than in the Na2PO3F-treated and fluoride-free rats. The potential advantage of Na2PO3F appears to justify more extensive investigation.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 753-771 
    ISSN: 1572-8943
    Keywords: crystal-crystal transitions ; crystal forms ; DMA ; DSC ; Nylon M5T ; X-ray
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Poly(2-methylpentamethylene terephthalamide) (Nylon M5T) is a new high temperature aromatic polyamide developed by Hoechst Celanese. In this paper thermal properties of Nylon M5T chips, as well as as-spun and drawn fibers were studied by DSC, DMA, hot stage microscopy and WAXS.T g of the fully amorphous Nylon M5T is 143°C when measured by DSC;T g increases with crystallinity to 151°C. The temperature dependence of the solid and melt specific heat capacities has also been determined. The heat capacity increase at the glass transition of the amorphous polymer is 103.9 J °C−1 mol−1.T g by DMA for the as-spun fiber is 155°C, for a drawn fiber is 180°C. Three secondary transitions were observed by DMA in addition to the glass transition. These correspond to a local mode relaxation of the methylene groups at −120°C, onset of rotation of the amide-groups at −65°C and the onset of the rotation of the phenylenegroups (at 63°C). The crystallinity of Nylon M5T strongly depends on the rate of cooling from the melt. The isothermal crystallization data are melt temperature dependent: two-dimensional crystallization takes place when the samples are crystallized from higher melt temperatures, and this phase changes into a spherulitic structure during cooling to room temperature. Spherulitic crystallization occurs when lower melt temperatures are used. This polymer has three crystal forms as indicated by DSC, DMA and WAXS data. The crystal to crystal transitions are clearly visible when amorphous samples are heated in the DSC, or the DMA curves of as-spun fibers are recorded. It is experimentally shown that a considerable melting of the lower temperature crystal forms takes place during the crystal to crystal transitions. The equilibrium melting point as measured by the Hoffman-Weeks method, has been determined to be 339°C.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 46 (1996), S. 733-752 
    ISSN: 1572-8943
    Keywords: hydroquinone ; isophthalic acid ; p-hydroxybenzoic acid ; thermotropic copolyester ; X-ray and DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The thermotropic copolyester consisting of 40 mol%p-hydroxybenzoic acid and 30 mol% isophthalic acid/30 mol% hydroquinone (HIQ40), prepared by two different synthetic routes (“acidolysis” or “phenylester”) was studied by differential scanning calorimetry and X-ray diffraction. All these samples show a glass transition temperature in the range of 125–141°C, dependent on the sample thermal history. A crystal to nematic transition is observed between 300 and 375°C. The samples prepared by the acidolysis route, when compared to those producedvia the phenylester reaction, have higher crystallinity which is due to the formation of “IA/HQ” crystals. The crystallinity can be increased significantly (as much as twice) by annealing the polymers at 300°C. The heat of fusion (X → N, crystal to nematic) of the annealed acidolysis samples is also higher than that of the polymers prepared by the phenylester process. The nematic to isotropic (N → I) transitions are broad, exhibiting no definite clearing points. Several mesogenic transitions as suggested by X-ray studies and two crystallization peaks were found for all samples studied. This may be an indication that the samples consist of two, distinct polymeric compositions or that there are two crystal forms. Furthermore, since the intensity ratio of the two crystallization peaks changes as a function of annealing, it is clear that the chemical/physical state of the polymer depends on the thermal history of the samples. Attempts to prepare amorphous HIQ40 and nematic HIQ40 glass by quenching from the isotropic state (480°C and 400°C, respectively) were unsuccessful, however, it can be prepared by precipitation of the acidolysis polymer from solution.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 419-436 
    ISSN: 1572-8943
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Journal of thermal analysis and calorimetry 54 (1998), S. 605-622 
    ISSN: 1572-8943
    Keywords: DSC ; MDSC ; polyamide 12 ; poly(p-phenylene sulfide) ; poly(vinylidene fluoride) ; reorganization ; TMDSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Although reorganization in metastable polymeric crystals has been recognized for over 30 years, the effect of molecular weight on the reorganization process has not been widely investigated. In this work three polymeric systems were studied: poly(vinylidene fluoride), polyamide 12, and poly(p-phenylene sulfide). For the polymers investigated, the lowest molecular weight sample was found to reorganize the most and, conversely, the highest molecular weight sample was found to reorganize the least. Comparisons of each system show that independent of molecular weight the reorganization rates among the three systems could be differentiated with the polyamide showing the greatest reorganization and the poly(phenylene sulfide) the least. Both conventional differential scanning calorimetry (DSC) and temperature-modulated DSC (TMDSC) were used in this study to investigate the reorganization process.
    Type of Medium: Electronic Resource
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