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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 21 (1972), S. 76-82 
    ISSN: 1432-0533
    Keywords: Proton-Beam Irradiation ; Hypophysectomy ; Delayed Radionecrosis ; Pathogenesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neuropathological material from eight patients hypophysectomized by protonbeam irradiation was studied. In no instance was radiation damage to the brain clinically evident. However, in the brains of five of these patients, small radionecrotic lesions were found in the medial temporal lobes and hypothalamus, and the extent of pituitary necrosis was documented. Possible pathogenetic factors in the development of lesions in these areas of the brain are briefly discussed.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 20 (1972), S. 348-356 
    ISSN: 1432-0533
    Keywords: Proton-Beam Irradiation ; Isodose Curves ; Radiation Necrosis ; Tissue Dose ; Vulnerability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In ten patients with intracranial tumor, treatment with proton-beam irradiation was followed by neuropathologic evaluation of autopsy material. Computer-determined isodose curves of radiation dosage aided the correlation of tissue damage with tissue dose of irradiation. Although we found variations in the vulnerability of different anatomic regions (and even within the same region), threshold levels for the effect of proton irradiation were defined. Variables other than tissue dose which determine the extent of damage to the brain include the volume of tissue irradiated, length of time following irradiation, and limitations in our own ability to establish tumor boundaries. Despite these variables, however, tissue reaction and threshold levels following proton-beam irradiation are similar to those of other modalities of radiation therapy.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-1440
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Studies on the mode of action of angiotensin were performed in aortic strip preparations of rats. Rinsing with angiotensin caused a significant decrease of the content of noradrenaline of the preparations. Studies of the mechanical pattern of the preparations revealed the development of a complete tachyphylaxis during continuous or repeated application of angiotensin. Angiotensin regained its activity after temporary application of noradrenaline. There was a crossed tachyphylaxis between angiotensin and tyramine. Application of cocaine caused a diminished effect of angiotensin and prevented the restitution of the effect of angiotensin by noradrenaline. After pretreatment of the animals with reserpine there was an accelerated development of angiotensin tachyphylaxis. It is concluded that there is an indirect vasoconstrictor action of angiotensin dependent on “available” noradrenaline in the adrenergic terminals of the vessel wall.
    Notes: Zusammenfassung Es wird über Versuche zum Wirkungsmechanismus von Angiotensin an Aortenstreifenpräparaten von Ratten berichtet. Nach Bespülung mit Angiotensin war der Noradrenalingehalt der Präparate signifikant vermindert. Kontraktionsmessungen ergaben, daß nach länger dauernder oder wiederholter Angiotensinbespülung eine vollständige Tachyphylaxie eintrat, die sich durch zwischenzeitliche Noradrenalinbespülung wieder durchbrechen ließ. Zwischen Angiotensin und Tyramin bestand eine gekreuzte Tachyphylaxie. Cocain schwächte die Angiotensinwirkung ab und verhinderte die Wiederherstellung der Angiotensinwirkung durch Noradrenalin. Nach Vorbehandlung der Tiere mit Reserpin entwickelte sich die Angiotensintachyphylaxie in kürzerer Zeit. Die Ergebnisse werden mit einer indirekten vasoconstrictorischen Wirkung von Angiotensin erklärt, die an die Gegenwart von freisetzbarem Noradrenalin in den terminalen sympathischen Nervenfasern der Gefäßwand gebunden ist.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Journal of molecular medicine 51 (1973), S. 214-221 
    ISSN: 1432-1440
    Keywords: Biosynthesis ; autoradiographic studies ; glycosaminoglycans ; human dermis ; scleroderma ; Biosynthese ; autoradiographische Untersuchungen ; Glycosaminoglycane ; menschliche Haut ; Sklerodermie
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung In Hautschnitten von 16 Gesunden und 10 Patienten mit progressiver Sklerodermie wurde die Biosynthese von Glycosaminoglycanen (GAG) und Proteinen mit Hilfe autoradiographischer, histochemischer und radiobiochemischer Methoden in vitro unter aeroben und anaeroben Bedingungen untersucht. Die Autoradiographie mit radioaktiven Vorstufen der Sulfopolysacharid- (35SO4,3H-Glucosamin) und Proteinbiosynthese (3H-Prolin) indizierte deren Lokalisation in Epithelund Coriumzellen. Die Einbauraten aller 3 Vorstufen waren in der Haut von Sklerodermiepatienten 2- bis 20fach gegenüber Kontrollen gesteigert. Die Auszählung der Silberkörner pro 1000 Zellen läßt folgende Einbauverhältnisse im Corium zu Stratum spinosum zu Stratum basale für35SO4 erkennen: Kontrollen: 2,7:2,1:1,0, Sklerodermie: 12,3:2,7:1,0; für3H-Glucosamin: Kontrollen: 8,3:3,2:1,0, Sklerodermie: 22,0:5,6:1,0; für3H-Prolin: Kontrollen: 21,1:7,2:1,0, Sklerodermie: 15,6:3,4:1,0. Die in der Haut von Sklerodermiepatienten histochemisch nachweisbar vermehrte Ablagerung saurer und sulfatierter GAG stand in guter Korrelation mit den autoradiographisch nachweisbaren Syntheseorten (Stratum spinosum, Coriumbindegewebszellen, Hautanhangsgebilde, Gefäßwände). Damit kommen als Syntheseort von GAG Zellen ektodermalen und mesenchymalen Ursprungs in Frage. Die radiobiochemische und Infrarot-Spektralanalyse des Syntheseproduktes von Hautzellen zeigte bei Gesunden eine Sulfopolysaccharidfraktion mit überwiegend am C4- weniger am C6-Atom veresterten Sulfatgruppen, bei Sklerodermiepatienten eine Zunahme der am C6-Atom veresterten Sulfatgruppen. Der Uronsäuregehalt dieser Fraktion nahm in der Haut von Sklerodermiepatienten 4,4fach zu. Die spez. Radioaktivität (IpM/µMol Uronsäure) von Sulfatestergruppen, Hexosaminen und3H-Prolin war bei Sklerodermiepatienten gegenüber Kontrollen um 3-, 1,1- bzw. 1,9fach erhöht. Hieraus wird auf eine bevorzugte Neubildung von Sulfopolysacchariden in der Haut von Sklerodermiepatienten geschlossen. Radioaktive Einbauraten, anaerobe Glycolyserate und Hexosaminausscheidung im Urin zeigen eine vom Krankheitsverlauf abhängige Steigerung.
    Notes: Summary The biosynthesis of glycosaminoglycans and proteins was studied in skin slices of 16 healthy subjects and 10 patients with progressive skleroderma, using autoradiographic, histochemical and radiobiochemical methods in vitro under aerobic and anaerobic conditions. The sulphopolysaccharide and protein biosynthesis was localized autoradiographically in the cells of the epithelium and of the corium using35SO4 and3H-glucosamine as precursors of the sulphopolysaccharide biosynthesis and3H-proline as a precursor of the proteinbiosynthesis. Incorporation rates of these 3 precursors were 2 to 20 times higher in the skin of patients than in that of controls. The following proportions of the incorporation rates (silver grains per 1000 cells) were found for35SO4 incorporation in controls: corium to stratum spinosum to stratum basale as 2.7:2.1:1.0; in patients 12.3:2.7:1.0; for3H-glucosamine in controls 8.3:3.2:1.0 and in patients 22.0:5.6:1.0; for3H-proline in controls 21.0:7.2:1.0 and in patients 15.6:3.4:1.0. An increased deposition of acid and sulphated glycosaminoglycans was demonstrated with histochemical methods in the skin of patients with progressive skleroderma. It correlated well with the spots of glycosaminoglycan biosynthesis as shown autoradiographically in human skin (stratum spinosum, cells in corium and in wall of little vessels, perifollicular space). These findings evidenced a biosynthesis of glycosaminoglycans taking place in cells of ectodermal as well as of mesodermal origin. Radiobiochemical and infrared analysis of the in vitro synthesized product of human skin cells of healthy persons indicated a sulphopolysaccharide fraction exhibiting mainly C4- (less C6-) esterified sulphate groups whereas a relative increase of C6-esterified sulphate groups was found in patients with skleroderma. The content of uronic acid grew up to the 4.4fold in the skin of patients. The specific radioactivity (IpM/µmole uronic acid) of sulphate ester groups, radioactive hexosamine and proline residues increased to 3-, 1.1- and 1.9fold in patients compared to controls. The incorporation rate of radioactive precursors, the rate of anaerobic glycolysis and the excretion of hexosamine in urine depended on the malignancy of skleroderma.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Journal of cancer research and clinical oncology 47 (1938), S. 469-472 
    ISSN: 1432-1335
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    Archives of gynecology and obstetrics 180 (1951), S. 271-273 
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 2729-2737 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Absorption and total fluorescence spectra of NO transitions perturbed by argon and krypton at various densities from the dilute gas to the low temperature solid are reported for photon energies 6≤hν≤9 eV. The valence transitions shift monotonically to lower photon energies with increasing perturber number density. The Rydberg transitions to n=3 (A 2Σ+, C 2Π, D 2Σ+) exhibit a moderate red shift at low perturber densities followed by an increasing blue shift with increasing density. Both valence and Rydberg transition energies vary smoothly and continuously with perturber number density even upon the liquid–solid phase transition. For fluid argon the experimental energy shifts are analyzed employing the semiclassical theory for line broadening.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 7627-7634 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: By use of optical steady state and time resolved spectroscopy, we studied the evolution of the triplet excited state in a series of six ethynylenic polymers of the structure [-Pt(PBu3n)2-C(Triple Bond)C-R-C(Triple Bond)C-]n where the spacer unit R is systematically varied to give optical gaps from 1.7–3.0 eV. The inclusion of platinum in the polymer backbone induces a strong spin-orbit coupling such that triplet state emission (phosphorescence) associated with the conjugated system can be detected. Throughout the series we find the S1-T1 (singlet-triplet) energy splitting to be independent of the spacer R, such that the T1 state is always 0.7±0.1 eV below the S1 state. With decreasing optical gap, the intensity and lifetime of the triplet state emission were seen to reduce in accordance with the energy gap law. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Macmillian Magazines Ltd.
    Nature 413 (2001), S. 828-831 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The efficiency of light-emitting diodes (LEDs) made from organic semiconductors is determined by the fraction of injected electrons and holes that recombine to form emissive spin-singlet states rather than non-emissive spin-triplet states. If the process by which these states form is ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 4963-4970 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Soluble, rigid-rod organometallic polymers trans-[-Pt(PBu3n)2–C(Triple Bond)C–R–C(Triple Bond)C–]∞ (R(Double Bond)bithienyl 2, terthienyl 3) have been synthesized in good yields by the CuI-catalyzed dehydrohalogenation reaction of trans-[Pt(PBu3n)2Cl2] with one equivalent of the diterminal alkynyl oligothiophenes H–C(Triple Bond)C–R–C(Triple Bond)C–H in CH2Cl2/iPr2NH at room temperature. We report the thermal properties, and the optical absorption, photoluminescence, and photocurrent action spectra of 1 (trans-[–Pt(PBu3n)2–C(Triple Bond)C–R–C(Triple Bond)C–]∞, R(Double Bond)thienyl), 2 and 3 as a function of the number of thiophene rings within the bridging ligand. With increasing thiophene content, the optical gap is reduced and the vibronic structure of the singlet emission changes toward that typical for oligothiophenes. We also find the intersystem crossing from the singlet excited state to the triplet excited state to become reduced, while the singlet–triplet energy gap remains unaltered. The latter implies that, in these systems, the T1 triplet excited state is extended over several thiophene rings. The photoconducting properties do not depend on the size of the thiophene fragment. We discuss and compare our results with studies on oligothiophenes and related organometallic polymers. © 1999 American Institute of Physics.
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