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  • 1975-1979  (5)
  • 1965-1969
  • 1915-1919
  • Chemistry  (2)
  • Differentiation of cytotrophoblast  (1)
  • Neurohypophysis  (1)
  • phytoecdysteroids  (1)
Datenquelle
Materialart
Erscheinungszeitraum
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Movement of neurosecretory product through the anatomical compartments of the neural lobe of the pituitary gland (1975)
    Springer
    Cell & tissue research 156 (1975), S. 483-497 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Neurohypophysis ; Neurosecretion ; Neurophysin ; Neurohypophysia hormones ; Electron microscopy ; Autoradiography
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary Electron-microscope autoradiographs have been prepared from the neural lobes of the pituitary glands of rats which had received intracisternal injections of [35S] cysteine at various times before gland removal. The rate of appearance and disappearance of autoradiographically demonstrable radioactivity in the neural lobe closely paralleled that previously determined, biochemically, for radioactive hormones and neurophysins. Radioactivity was appreciably associated with the undilated parts of neurosecretory axons only during the first few hours after injection of the label. The axonal dilations were subdivided into those in which small vesicles could be seen (“endings”) and those in which no small vesicles could be seen (“swellings”). Radioactivity appeared first in “endings” and then in progressively larger and larger profiles of “swellings”. It appeared that newly arrived granules were found close to the limiting membrane of the nerve swelling and that as time progressed they moved deeper and deeper into the swelling. On the basis of the results, suggestions were made for an anatomical explanation of the readily-releasable pool of hormone which has been demonstrated pharmacologically.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00225108
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  • 2
    Digitale Medien
    Digitale Medien
    The role of phytoecdysteroids in bracken fern,Pteridium aquilinum (L.) Kuhn as a defense against phytophagous insect attack (1978)
    Springer
    Journal of chemical ecology 4 (1978), S. 117-138 
    Details
    ISSN: 1573-1561
    Schlagwort(e): Bracken fern ; Pteridium aquilinum ; phytoecdysteroids ; insect feeding deterrents
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie
    Notizen: Abstract Analysis of green bracken fronds collected during July, August, and October, 1975, for phytoecdysteroids showed that these compounds occur in only trace amounts (0.25–0.53 μg/kg fresh weight [FW]). The effect of ecdysteroids on the feeding behavior of seven species of insect showed that four species were deterred at ecdysteroid concentrations at or above 60 mg/kg FW diet; one species of insect at 6 mg/kg or above, and two species which were not affected at the higher concentrations. It was concluded that the levels of phytoecdysteroids in bracken would not deter insects from feeding on the plant. The previously published data relevant to the possible role of phytoecdysteroids as defense compounds are also discussed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00988049
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  • 3
    Digitale Medien
    Digitale Medien
    A possible role for placental lysosomes in the formation of villous syncytiotrophoblast (1977)
    Springer
    Cell & tissue research 178 (1977), S. 411-419 
    Details
    ISSN: 1432-0878
    Schlagwort(e): Human placenta ; Lysosomes ; Differentiation of cytotrophoblast ; Electron microscopy
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary An ultrastructural and ultrahistochemical study of first trimester human placentae confirms previous reports that the cytotrophoblastic cells show a spectrum of differentiation, that dissolution of the limiting membrane of the cytotrophoblastic cells occurs and that fragments of free membrane can be found in the syncytiotrophoblast. There is an aggregation of primary lysosomes in the region of approximation of the cytotrophoblast to the syncytiotrophoblast, free lysosomal enzymes are found in the space between the two trophoblastic components, secondary lysosomes have been noted in the vicinity of fragmenting cytotrophoblastic cell membrane and the incorporation of a segment of free membrane into a vesicular structure has been noted. It is suggested that placental lysosomes mediate the dissolution of the cytotrophoblastic cell membranes that is a necessary prerequisite for their full differentiation into syncytiotrophoblast and it is further suggested that one of the principal roles of placental lysosomes is in the structural refashioning of the organ that occurs during the first trimester.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00218704
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  • 4
    Digitale Medien
    Digitale Medien
    Photon correlation spectroscopy of hemoglobin: Diffusion of Oxy-HbA and Oxy-HbS (1978)
    New York : Wiley-Blackwell
    Biopolymers 17 (1978), S. 1581-1593 
    Details
    ISSN: 0006-3525
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Notizen: Translation diffusion coefficients have been measured for oxyhemoglobin A and oxyhemoglobin S over the concentration range 0.1-37 g/dl by means of photon correlation spectroscopy. The solutions were 0.1 M in KCl and in each case the pH was adjusted to the isoelectric point of the hemoglobin species present. No significant differences were found between the HbA and HbS results; and after correction to water at 20°C, the diffusion coefficients could be described by the equation \documentclass{article}\pagestyle{empty}\begin{document}$$ D{\rm } = {\rm }D_0 \left[{1{\rm } - {\rm }\left({{\rm 0}{\rm .0067} \pm {\rm 0}{\rm .0007}} \right)c} \right] $$\end{document} where Do = (6.93 ± 0.06) × 10-7 cm2/sec and c ids the concentration in units of g/dl. No evidence was found for the aggregation of oxy-HbS at high concentrations which was reported by Lindstrom et. al. [(1976) Biophys. J. 16, 679-689].
    Zusätzliches Material: 3 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/bip.1978.360170615
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  • 5
    Digitale Medien
    Digitale Medien
    A study of the reaction of human tissue to proplast (1979)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 13 (1979), S. 121-134 
    Details
    ISSN: 0021-9304
    Schlagwort(e): Chemistry ; Polymer and Materials Science
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Medizin , Technik allgemein
    Notizen: The femoral stems of Thompson prostheses coated with a polytetrafluoroethylene/carbon fiber composite (proplast) were studied using conventional histological examination, scanning electron microscopy and electron probe microanalysis in “successful” firm implants and in a “loose” clinically unsuccessful implant. Ingrowth was found throughout the coatings of the successful prostheses. In the most firmly fixed prosthesis the ingrowth consisted of fibrous tissue with abundant giant cells; however, no bone ingrowth was detected. There was less composite pore infilling in the unsuccessful implant. From both clinical, radiological and the studies described above, it is concluded that fibrous tissue ingrowth was a secondary stabilizing phenomenon in the proplast-coated prostheses studied.
    Zusätzliches Material: 14 Ill.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/jbm.820130113
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