Bibliothek

X
feed icon rss

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
Filter
  • 1990-1994  (4)
  • 1975-1979  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Epitaxial YBa2Cu3Ox thin films with x=6–7 by oxygen in-diffusion following laser deposition (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1782-1786 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: We have synthesized (001)-epitaxially grown YBa2Cu3Ox thin films with x=6–7 by laser deposition without post-annealing. A key point in the control of x is oxygen pressure during rapid cooling following the deposition. The relation between x and oxygen pressure almost agrees with a thermal equilibrium curve at 500 °C. This can be explained by the incorporation of oxygen during the cooling, considering that the oxygen in-diffusion is enhanced by the fast ab-plane diffusion in misoriented regions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.346609
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 2
    Digitale Medien
    Digitale Medien
    Raman scattering from LO phonon-plasmon coupled modes in gallium nitride (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 1098-1101 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Raman spectra of n-type gallium nitride with different carrier concentrations have been measured. The LO phonon band shifted towards the high-frequency side and broadened with an increase in carrier concentration. Results showed that the LO phonon was coupled to the overdamped plasmon in gallium nitride. The carrier concentrations and damping constants were determined by line-shape fitting of the coupled modes and compared to values obtained from Hall measurements. The carrier concentrations obtained from the two methods agree well. As a result, the dominant scattering mechanisms in gallium nitride are deformation-potential and electro-optic mechanisms.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.356492
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 3
    Digitale Medien
    Digitale Medien
    Effects of Pinealectomy on the Mitotic Activity of Adrenomedullary Chromaffin Cells in Relation to Time of Day (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of pineal research 8 (1990), S. 0 
    Details
    ISSN: 1600-079X
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The frequency of mitoses of adrenaline (A) cells and noradrenaline (N) cells in the adrenal medulla of nonoperated (NO), sham-operated (SPX), and pinealectomized (PX) male, 53-day-old Holtzman rats (n = 133) was investigated by means of light microscopy. Animals were killed at eight time points during a standardized 24-h light-dark (12:12) cycle 14 days after surgery. Mitotic indices (n/1,000) were determined in sections of adrenal medulla fixed with glutaraldehyde and OsO4. Overall frequency of mitoses was extremely low (mitotic index: 0.73 = 115/157,223). Daily mean mitotic index was maximum in A cells (0.83) and minimum in N cells (0.52) of PX group but did not show statistically significant differences between cell types or experimental groups. Neither cell type in NO animals showed 24-h changes in mitotic index, but cells in SPX animals did, with highest value in the late dark phase and lowest in the late light phase, when values of two cell types were combined (P〈0.01–0.001). In PX animals, mitotic index followed a similar but more distinct 24-h change in A cells (P〈0.009), but not in N cells, resulting in different time-of-day changes between two types of cells (P〈0.01–0.05). The mitotic index was higher in PX than in control (NO and SPX) animals in the middark phase (P〈0.05) and lower in operated (SPX and PX) than in nonoperated (NO) animals from late light to the early dark phase, suggesting that the latter was possibly due to a residual effect of the surgery. These results are consistent with the interpretation that the pineal has an inhibitory action on A cells and may coordinate the two types of cells in their mitotic activity, especially in the middark phase of the daily cycle.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1600-079X.1990.tb00803.x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 4
    Digitale Medien
    Digitale Medien
    Differences between adrenomedullary adrenaline and noradrenaline cells: quantitative electron-microscopic evaluation of their differential cellular association with supporting cells (1993)
    Springer
    Cell & tissue research 271 (1993), S. 257-261 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Adrenal medulla ; Adrenaline cell ; Noradrenaline cell ; Supporting cell ; Cell-association pattern ; Cytological differences ; Quantitative electron microscopy ; Rat (Holtzman)
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Abstract Quantitative differences in cellular association of adrenomedullary chromaffin cells with other types of cells, mainly supporting cells, were studied. Adrenaline (A) and noradrenaline (NA) cells were compared. Electron micrographs (12000 x) of profiles of A and NA cells, bordering against other types of cells, were used for quantitative evaluation. Supporting cells constituted the majority of the non-chromaffin cell types. Occurrence frequencies of chromaffin cells contiguous with other types of cells were: (1) higher for A cells (68.9%, 199/289) than for NA cells (11.0%, 34/309) in case of small contact regions (χ2-test: P〈0.001) and (2) higher for NA cells (68.3%, 211/309) than for A cells (9.7%, 28/289) in case of extended contact regions (P〈0.001). In conclusion, the extent of cellular association with supporting cells was remarkably lower in A cells than in NA cells. Such an arrangement is likely to be appropriate for the extensive, homogeneous control and amplified response characteristic of A cells, and for the close range, complex control and more diverse responses characteristic of NA cells.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00318611
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
  • 5
    Digitale Medien
    Digitale Medien
    Hypothalamic dopamine-β-hydroxylase activity: Fluctuations with time of day and their modifications by intracranial surgery, adrenalectomy, and pinealectomy (1978)
    Springer
    Neurochemical research 3 (1978), S. 281-293 
    Details
    ISSN: 1573-6903
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Abstract Hypothalamic and plasma dopamine-β-hydroxylase (DBH, EC 1.14.2.1) activities were measured by a coupled radioenzymatic method. Animals representing five experimental groups (intact controls, adrenalectomized, pinealectomized, adrenalectomized + pinealectomized, doubly sham-operated) were killed and sampled at 8 times through the 24-hr daily cycle, 15 days postoperation, and at 50–52 days of age. Hypothalamic DBH in intact control animals had statistically significant fluctuations in relation to time of day. These changes were lost or dampened in groups that had had intracranial surgery and were characteristically shifted by adrenalectomy, either alone or with pinealectomy. Plasma DBH fluctuations in the same animals resembled those in hypothalamus in some features (e.g., peak near mid-dark; shift in daily maxima and minima after adrenalectomy) and differed in others (e.g., no effect of intracranial surgery or of sham operation; adrenalectomized + pinealectomized animals resembled the solely pinealectomized). Although temporal patterns in hypothalamic DBH activity thus differed in the experimental animal groups, the daily means of hypothalamic DBH activity were similar.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00965575
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    Artikel (Nationallizenzen)
    Volltext
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...