ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Macromolecules 19 (1986), S. 2065-2072 
    ISSN: 1520-5835
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 35 (1963), S. 1306-1307 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1432-0827
    Keywords: Rickets ; Vitamin D ; Bone mineral ; Hypophosphatemia ; X-ray microanalysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The elemental composition of trabecular bone was compared for: (a) rats made rachitic on a low phosphorus, vitamin D-deficient diet; (b) rats fed the same diet but supplemented with vitamin D; (c) normal rats fed a standard laboratory diet with normal phosphorus and vitamin D levels. Quantitative energy dispersive X-ray microanalysis was performed on mineralized bone matrix at four sites: (1) clusters of mineral crystals in osteoid; (2) bone matrix adjacent to osteoid containing mineralization clusters; (3) peri-lacunar bone matrix; and (4) deep bone matrix distant from osteocytes. Estimations were also made of serum calcium, phosphorus, and 25-hydroxy-vitamin D, and of calcium, phosphorus, and hydroxyproline in whole bone. At bone sites 2, 3, and 4, the mineral content was greater in the normal group than in the other two groups. At each site, the mineral content of the rachitic bone matrix was greater than that from the vitamin D-treated group. A normal pattern of increasing mineral content with distance into the bone from a recently mineralized border was found in the normal and vitamin D-treated groups but was notably absent in the rachitic bones. Microprobe measurements of Ca:P molar ratios in hydroxyapatite standards and in normal rat bone were approximately 1.7. In both rachitic and vitamin D-treated bones, the Ca:P molar ratio was significantly higher than that in normal bones and correlated with serum Ca:P ratios. It is suggested that the increased Ca:P ratios in the rachitic and vitamin D-treated bones may be explained by an increased carbonate deposition.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 4 (1970), S. 89-90 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 1 (1967), S. 137-143 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Description / Table of Contents: Résumé Nous avons trouvé une solution approximative d'un modèle cinétique à 2 compartiments. Le modèle considéré perment l'échange du traceur entre 2 compartiments et la perte de ce traceur à partir d'un seul compartiment. Cette solution est utilisée pour calculer les taux de renouvellement des 2 compartiments à partir de la rétention du traceur dans ce modèle. Ainsi, en mesurant la rétention de l'isotope traceur dans un tel système à l'aide d'un comptage «in toto» il est possible de calculer les taux de renouvellement des 2 compartiments du système. En utilisant un calculateur électronique KDF 9 pour résoudre 64 modèles établis, nous avons été capables de préciser les limites des constantes cinétiques dans lesquelles l'utilisation de l'approximation máthématique est justifiée.
    Abstract: Zusammenfassung Wir fanden eine Näherungsgleichung für ein kinetisches 2-Kompartment-Verteilungsmodell. Das Modell erlaubt den Austausch von Tracersubstanzen zwischen zwei Räumen und die Angabe des Tracers aus einem Raum. Die Gleichung wurde verwendent, um die Umsatzrate in den zwei Räumen nach der Retention des Tracers im Modell zu berechnen. Durch Messung der Retention eines Isotops in einem derartigen System mit dem Ganzkörperzähler ist es dann möglich, die Umsatzraten in beiden Verteilungsräumen zu berechnen. Ein English Electric KDF 9 Computer, der 64-stufige Vorlagen löst, ermöglicht es, den Bereich der kinetischen Komponenten zu definieren, über welchen die Verwendung der mathematischen Nährung gerechtfertigt ist.
    Notes: Abstract We have found an approximate solution of a two-compartment kinetic model. The model considered allows exchange of tracer between the two compartments, and loss of this tracer from one compartment. This solution was used to calculate the turnover rates of the two compartments from the retention of the tracer in the model. Hence, by measuring in a whole body counter the retention of an isotope tracer in such a system, it is possible to calculate the turnover rates of the two compartments of the system. Using an English Electric KDF 9 computer to solve 64 stated models, we have been able to define the range of kinetic constants over which the use of the mathematical approximation is justifiable.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 2 (1968), S. 40-40 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 22 (1976), S. 225-228 
    ISSN: 1432-0827
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Calcified tissue international 22 (1977), S. 219-226 
    ISSN: 1432-0827
    Keywords: Hydroxyapatite ; Bone ; X-ray Diffraction
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract Evidence relating to the existence of crystalline bone mineral in vivo is considered, and bone apatite crystal structure investigated using an x-ray powder diffraction technique. Specimens of femoral compacta excised post-mortem from male and female subjects ranging from 3 1/2 years to 87 years of age have been studied. Values of the ratio c/a of bone apatite crystal cell axes for females are significantly higher (p〈0.05) than for males. Moreover, significant change of c/a with age is observed for males (p=0.0005) but not for females (p=0.30). Differences in c/a are interpreted as indicating substitution of constituent ions in the bone apatite crystals.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 2162-2166 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Monochromatic synchrotron radiation was used to excite selectively core electrons of the carbon and fluorine atoms in carbon tetrafluoride and silicon and fluorine in silicon tetrafluoride. The fragmentation processes were examined using time-of-flight mass spectroscopy. The mass spectra show the distribution of ions collected in coincidence with low and high energy electrons. Distinct changes in the mass spectra with atomic site of excitation and photon energy are observed. The observation of F2+ ions following fluorine 1s excitation in SiF4 provides significant evidence for a "valence bond depopulation'' mechanism involving the formation of a localized, two-hole final state that persists on the time scale of fragmentation. In contrast, no F2+ was observed for CF4, which indicates that fragmentation for this molecule is more characteristic of a delocalized two-hole state.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 7936-7945 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The symmetry of excited states reached by photoexcitation of K-shell electrons of N2 and O2 is identified from the fragmentation anisotropy. For each molecule, ion yield excitation spectra were obtained at 90°, 54.7°, and 0° relative to the axis of soft x-ray polarization. The degree of polarization of the synchrotron radiation was determined experimentally. From this determination and the angular dependence of the ion yield, the photoabsorption anisotropy parameter β is obtained as a function of photon energy. Variations in the β spectra are discussed in terms of previously assigned spectral features and are compared with other experimental results. A comparison also is made with theoretical calculations, which are available for the case of N2.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...