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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 197 (1966), S. 192-196 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Extending the results of a preceding paper the excited vibrational states of the H 2 + ion are calculated. To this end we employ an improved Born-Oppenheimer-approximation.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 162 (1961), S. 1-14 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The three-body problem of quantum mechanics has been treated in appropriate co-ordinates. These are, besides those of the center-of-mass, the distances between the three particles and three Eulerian angles, fixing in space the position of the triangle formed by the particles. The Hamiltonian can be simplified by introducing the usual angular momentum operators of a gyrating rigid body. The solution of the wave equation has been discussed. Factorization into an angular part and a part depending on the particle distances only leads to certain linear combinations of such products. The angular parts have the well-known form of the representation coefficientsD MK L of the three-dimensional rotational group. The parts depending on the distances may be derived from a system of differential equations coupling, in two separate sets, either even or odd values ofK for each given value ofL.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 173 (1963), S. 432-437 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Using results of a preceding paper, the wavefunctions of nuclear vibrations in muon molecules have been calculated by numerical integration, especially at small nuclear distances. These functions have then been used to determine reaction rates of nuclear fusion. The effect of nuclear forces on the wavefunction at very small distances has been estimated and taken account of. The numerical results reasonably agree with (pμd) experiments.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 172 (1963), S. 219-223 
    ISSN: 1434-601X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that the so-called hypervirial theorems found byHirschfelder and coworkers (Sect. 1) are satisfied for a large class of variational trial functions (Sect. 2). The results are applied to several variational approximations to the eigenfunctions of the H 2 + molecule (Sect. 3).
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is generally assumed that there are free electronic carriers associated with the CuO2 planes in high-temperature superconductors. Regarding these carriers as confined to these planes their influence on phonon frequencies is studied within the framework of a shell model of lattice dynamics taking into account the long-range part of the electron-phonon coupling. We find a complete suppression of the LO-TO splitting for modes polarized along the planes by metallic screening and a strong coupling of electronic plasmon and particle-hole excitations especially to some To-phonon branches polarized perpendicular to the conducting planes, particularly pronounced in systems with at least two CuO2 planes per unit cell. Numerical results are presented for YBa2Cu3O7.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Polyposis nasi ; Nasaler Fibroblast ; Chloridleitfähigkeit ; Zystische Fibrose ; Key words Nasal poyps ; Nasal fibroblast ; Chloride conductance ; Cystic fibrosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Cystic fibrosis (CF) is a complex systemic disease that has pathological alterations in the upper airways, including the recurrent formation of nasal polyps. Although the fibroblast is the predominant cell type in nasal stroma and nasal polyps, little is known about the electrophysiological properties of nasal fibroblasts. We investigated whether fibroblasts possess a cAMP-regulated chloride conductance which is impaired in patients with CF. Thus far the few studies concerning conductance in fibroblasts have been performed on skin fibroblasts using indirect methods and have yielded conflicting results. Therefore we studied chloride conductance in fused nasal fibroblasts by employing conventional microelectrodes. We have demonstrated that a cAMP-regulated chloride conductance is present in fibroblasts. However, this chloride conductance cannot be activated in fibroblasts from CF-patients. Thus, we present direct evidence that the impairment of the cAMP-regulated chloride conductance in CF is not confined to epithelial cells but also affects the fibroblast. We discuss how this conductance might modulate fibroblast proliferation to produce polyp formation.
    Notes: Zusammenfassung Zum komplexen Krankheitsbild der zystischen Fibrose (CF) gehören überdurchschnittlich häufig auftretende Rhinosinusitiden und Nasenpolypenbildung. Der Basisdefekt dieser Erkrankung ist im cAMP-abhängigen Chloridkanal lokalisiert. Elektrophysiologische Untersuchungen zur Chloridleitfähigkeit am nasalen Fibroblasten liegen noch nicht vor. Da der Fibroblast das Grundgerüst des Nasenpolypen bildet, erscheint es wichtig zu untersuchen, ob eine cAMP-abhängige Chloridleitfähigkeit auch im nasalen Fibroblasten nachzuweisen ist, und ob diese Leitfähigkeit bei CF-Fibroblasten defekt ist. Wir haben deshalb mit Hilfe konventioneller Mikroelektroden Potentialmessungen an Fibroblasten aus Primärkulturen von Nasenpolypen durchgeführt. Unsere Untersuchungen zeigen, daß der Nicht-CF-Fibroblast eine cAMP-regulierte Chloridleitfähigkeit besitzt, die bei CF-Fibroblasten fehlt. Die cAMP-regulierte Chloridleitfähigkeit, die in der Epithelzelle für den transepithelialen Chloridtransport und somit für die Atemwegsbefeuchtung erforderlich ist, hat im Fibroblasten offenbar eine andere Bedeutung. Sie ist wahrscheinlich an der Regulation der Zellproliferation beteiligt und könnte auf diese Weise in die Polypengenese eingreifen.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Kernspinsialographie ; Speicheldrüsengangsystem ; Nicht-invasive Diagnostik ; Speicheldrüsenerkrankungen ; Key words Magnetic resonance sialography ; Salivary gland ductal system ; Non-invasive diagnostic testing ; Parotid gland pathology
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The new technique of non-invasive magnetic resonance (MR) sialography was evaluated for normal and various pathologic conditions of the parotid gland. Ten volunteers and 15 patients with various symptomatic diseases of the parotid gland were tested in the present study. Diseases included pleomorphic adenoma, cystadenolymphoma, carcinoma ex pleomorphic adenoma, ductal carcinoma, adenoid cystic carcinoma, lymphoepithelial carcinoma, non-Hodgkin’s lymphoma, sialolithiasis, sialadenitis, Heerfordt’s syndrome and congenital duct ectasies. In addition to the usually performed T1 and T2 cross-sectional sequences a heavily weighted T2 sequence (TR 3600, TE 800) was performed and allowed depiction of a fluid-filled parotid duct. Results showed that the main parotid and primary branching ducts were depicted reliably in all normal cases and all patients, except one with sicca syndrome. Pathological conditions such as duct dilatations, duct strictures, obstructing duct calculus and irregular shapes and courses of the ductal system were demonstrable. While X-ray sialography obtained a higher resolution, only MR sialography was able to depict dilated ducts proximal from a complete obstruction, as well as all ductal cysts. Our findings show that MR sialography can be applied successfully to investigations of the parotid gland system. There have been no contraindications or complications to date because MR sialography is non-invasive. The technique will also allow the salivary ducts and lesions to be differentiated from the course of the facial nerve.
    Notes: Zusammenfassung Die Kernspinsialographie wird als Modifikation einer MR-Pulsfolge vorgestellt und ihre Speichelgangdarstellung mit der digitalen Subtraktionssialographie als Standard verglichen. Bei 10 gesunden Probanden und 15 symptomatischen Patienten mit Erkrankungen der Glandula parotis wurde eine stark T2-gewichtete Kernspintomographie (TR 3600, TE 800) angefertigt, so daß lediglich der intraduktale, statische Speichel signalgebend zur Darstellung kam. Die untersuchten Patienten wiesen sowohl benigne als auch maligne Tumoren, Sialolithiasitiden, Sialadenitiden, ein Heerfordt-Syndrom oder kongenitale Ganganomalien auf. Der Stenon-Gang sowie Gänge 1. Ordnung ließen sich in der Kernspinsialographie gut darstellen. In der Darstellung von Gängen 2. und 3. Ordnung war die MR-Sialographie der Subtraktionssialographie als Standardmethode unterlegen. Die Kernspinsialographie erwies sich dagegen in der Diagnostik erweiterter Gänge proximal von kompletten Gangverschlüssen und der Darstellung von zystischen Speichelretentionen überlegen. Pathologische Befunde wie Gangektasien, Gangstrikturen, intraduktale Steine, tumorös bedingte Gangverlagerungen oder Gangabbrüche konnten sowohl in der Kernspin- als auch in der Subtraktionssialographie vergleichbar erhoben werden. Die Kernspinsialographie ist aufgrund der Darstellung pathologischer Befunde generell zur Beurteilung des Speichelgangsystems der Glandula parotis geeignet. Vorteile liegen in ihrer Nichtinvasivität, dem Fehlen einer Strahlenexposition und der funktionellen Darstellung des Speichelgangsystems. Des weiteren kann mit Hilfe der Kernspinsialographie die oft publizierte, kernspintomographische Darstellung des N. facialis differentialdiagnostisch zu den Speichelgängen verifiziert, bzw. falsifiziert werden.
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  • 8
    ISSN: 1433-0768
    Keywords: Key words Solid state electrochemistry ; Mössbauer ; Magnetic susceptibility ; X-ray powder diffraction ; Iron(III)-cadmium(II) hexacyanoferrates
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Coprecipitates of CdII, KI and FeIII with hexacyanoferrate ions [Fe(CN)6]4− have been studied by solid-state electrochemistry (voltammetry of immobilized microparticles), magnetic susceptibility measurements, X-ray powder diffraction, electron spin resonance, Mössbauer and diffuse reflectance spectroscopy. Most suprisingly, all experimental results point to the formation of a continuous series of complex mixed phases without the formation of phase mixtures. Although CdII and FeIII ions differ too much in their ionic radii to allow the formation of simple substitution mixed hexacyanoferrates, they are capable of forming different kinds of complex insertion and substitution mixed crystals because of the zeolitic structure of both the iron and the cadmium hexacyanoferrate. Low cadmium concentrations can be found in the zeolitic cavities of iron hexacyanoferrate (Prussian blue), and they start to widen the lattice and facilitate, at higher concentrations, the direct substitution of high-spin iron(III) ions by cadmium ions. In cases of an excess of cadmium, the formation of cadmium hexacyanoferrate with iron(III) ions in the interstitials of the zeolitic structure is observed. These mixed phases show strong charge transfer bands in the visible range and have the appearance of “diluted” Prussian blue. For the first time, this indicates that the charge transfer between the carbon-coordinated low-spin iron(II) ions and the high-spin iron(III) ions can also occur when the latter are situated in the cavities of a host hexacyanoferrate. In Prussian blue the interstitial iron(III) ions are responsible for a very strong charge transfer interaction between the low-spin iron(II) ions and the nitrogen-coordinated high-spin iron(III) ions. Upon substitution of the very small amount of interstitial iron(III) ions in Prussian blue by potassium and cadmium ions the Kubelka-Munk function diminishes by more than 30%, indicating a tremendous decrease in iron(III)-iron(II) interaction.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Der Nervenarzt 67 (1996), S. 1030-1033 
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Zyste ; Sacral ; Intradural ; Laminektomie ; Marsupialisation ; Key words Cyst ; Sacral ; Intradural ; Laminctomy ; Marsupialisation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary In two female individuals (37 and 47 years old) sacral intradural arachnoid cysts caused low back pain and sciatica for several years until the correct diagnosis was established by MR imaging. Both patients had micturition disturbances (pollakisuria). In both cases a sacral laminectomy was carried out and the dorsal border of the cyst wall was resected (marsupialisation) after evacuation of xanthochrome fluid. Neither cysts showed any communication with the subarachnoid space. Postoperatively the patients were free of complaints; pollakisuria disappeared within 2–4 weeks.
    Notes: Zusammenfassung Es wird über 2 Fälle (weiblich, 37 und 47 Jahre) von sakralen intraduralen arachnoidalen Zysten berichtet, welche ein langjähriges lumbalgiformes Beschwerdebild verursacht hatten. In beiden Fällen lag eine Miktionsstörung im Sinne einer Pollakisurie vor. Die Diagnose wurde letztlich in beiden Fällen mittels Kernspintomographie gestellt. Es wurde jeweils eine sakrale Laminektomie durchgeführt, der xanthochrome Zysteninhalt entleert und die dorsale Zystenwand im Sinne einer Marsupialisation reseziert. Beide Zysten waren in sich abgeschlossen und hatten keine Kommunikation mit dem übrigen Subarachnoidalraum. Beide Patienten waren postoperativ schmerzfrei, die Miktionsstörungen bildeten sich innerhalb von 2–4 Wochen zurück.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 1433-0458
    Keywords: Schlüsselwörter Larynx ; Karzinom ; Vordere Kommissur ; Kehlkopfteilresektion ; Rezidivtherapie ; Key words Laryngeal carcinoma ; Anterior commissure ; Vertical partial laryngectomy ; Treatment for tumour recurrences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Management of laryngeal carcinoma located at the anterior commissure remains controversial. Local control rates with radiotherapy or surgery are not as good as those seen after treatment of midcord lesions. The vertical partial laryngectomy with epiglottic reconstruction (VPLER) may be a more successful approach to such lesions. The charts of all patients treated for larynx carcinoma between 1991 and 1996 at the authors’ institutions were reviewed to identify those patients treated with VPLER as described by Sedlacek in 1965, Kambic in 1976 and Tucker in 1979. Indications for performing surgery and outcome data of patients were collected and analyzed according to the indications for surgery, surgical technique, perioperative complications, oncological outcomes and functional results. Twelve patients were identified that had been treated with VPLER. Indications for surgery included five patients with local recurrences following endoscopic laser partial laryngectomies, four cases with previously untreated primary tumors at the anterior commissure (T2 N0–2 M0), two with local recurrences following radiotherapy, and one with recurrence following frontolateral partial laryngectomy. There were no postoperative complications except for one laryngocutaneous fistula that required secondary repair. All patients were able to swallow at the tenth postoperative day. All had their tracheostomies closed after completion of wound healing, (a mean of 17 days after surgery). Phonatory results were usually poor. Two local recurrences occurred during the follow-up period. However, both patients were salvaged with total laryngectomies and have since been free from disease. All other patients are alive and well. Our findings show that VPLER is an effective surgical approach for carcinoma at the anterior commissure of the larynx that cannot be adequately managed with transoral laser surgery or simple frontolateral partial laryngectomy. This study demonstrates that the procedure can be successfully applied to the treatment of local recurrences following initial raditherapy or surgery. No major complications occurred in our study.
    Notes: Zusammenfassung Hintergrund: Karzinome der vorderen Kommissur sind eine Schwachstelle der üblichen kehlkopferhaltenden Therapieverfahren. Die rekonstruktive Kehlkopfteilresektion nach Sedlacek-Kambic-Tucker erlaubt eine besonders weite Resektion des vorderen Schildknorpels und der anterioren Glottis. Indikationen, Technik und Ergebnisse werden am Krankengut der Kölner und Innsbrucker Klinik dargestellt. Methode: Es wurden die Akten aller Patienten retrospektiv ausgewertet, die zwischen 1991 und 1996 wegen eines Larynxkarzinoms operiert wurden. Ergebnisse: Bei 12 von 543 Patienten mit Larynxkarzinomen erfolgte eine rekonstruktive Kehlkopfteilresektion nach Sedlacek-Kambic-Tucker. Bis auf eine Fistelbildung traten keine Komplikationen auf. Bei einer mittleren, peroralen Ernährung ab dem 10. postoperativen Tag konnten alle Tracheostomien im Mittel am 17. postoperativen Tag verschlossen werden. Chronische Aspirationen oder Stenosen wurden nicht beobachtet. Die stimmlichen Ergebnisse sind aufgrund des ungenügenden Glottisschlusses und der unphysiologischen Konfiguration der rekonstruierten vorderen Kommissur schlecht. Schlußfolgerung: Die rekonstruktive Kehlkopfteilresektion nach Sedlacek-Kambic-Tucker hat eine sehr enge Indikationsstellung, ermöglicht aber eine chirurgisch sichere, radikale Resektion des vorderen Kehlkopfs, insbesondere auch bei Rezidivkarzinomen, mit onkologisch guten und funktionell zufriedenstellenden Ergebnissen.
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