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  • 1
    Electronic Resource
    Electronic Resource
    Photoelectron investigations and density functional calculations of anionic Sbn− and Bin− clusters (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 9719-9728 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We recorded photoelectron spectra of antimony Sb−N=2–9 and of bismuth clusters Bi−N=2–9 with a photon energy of 4.03 eV, as well as of Bi−N=2–21 with a photon energy of 5.0 eV. The experimentally determined photoelectron thresholds and peak positions of Sb−N=2–5 and Bi−N=2–5 are compared with the results of ab initio density-functional (LCAO) calculations. The agreement between the experimental thresholds and the calculated adiabatic electron affinities, as well as between the first maxima in the spectra and the calculated vertical detachment energies is fair to good for the antimony clusters and qualitative for the bismuth systems. For the calculation of the ionization (detachment) energies we determined for the neutral and anionic clusters the most stable structures by LCAO calculations. In particular, the tetramer cluster anions have a "roof'' structure, while the negatively charged pentamers are planar rings [with similarities to the (C5H5)− anion]; positive and negative trimers are nonlinear. Furthermore, the ionization energies and affinities of larger antimony and bismuth clusters are discussed qualitatively and compared to jellium calculations of Seidl and Brack. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471733
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrashort laser pulse induced deformation of silver nanoparticles in glass (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 74 (1999), S. 1200-1202 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Irradiating intense femtosecond laser pulses on a glass sample containing silver nanoparticles results in permanent sample color changes if the laser wavelength is in the region of the particles' surface plasmon resonance. In particular, even a single pulse of appropriate intensity can modify the initially isotropic extinction of glass containing spherical particles to a dichroic sample behavior in the irradiated area. This observation is interpreted as ultrafast particle deformation induced by the laser pulse creating nonspherical particles of uniform orientation. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.123498
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  • 3
    Electronic Resource
    Electronic Resource
    The spectrum of giant cells in tumours of the salivary glands: an analysis of 11 cases (1997)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral pathology & medicine 26 (1997), S. 0 
    Details
    ISSN: 1600-0714
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In view of the different terminology for salivary gland tumours with giant cells, eleven cases were analysed by histopathology and immunocytochemistry. Four cases (three pleomorphic adenomas, one carcinosarcoma in a pleomorphic adenoma) were classified as having a foreign-body giant cell reaction, and five cases (two mucoepidermoid carcinomas, one acinic cell carcinoma, two carcinomas in pleomorphic adenomas) as having a sarcomatoid osteoclast-like giant cell reaction. In two further cases a giant cell tumour and a giant cell granuloma were associated with carcinomas in pleomorphic adenomas. All giant cells showed characteristic expression of CD68 as a typical marker for histiocytes and macrophages with their origin in mononuclear haematopoetic stem cells. There was no evidence for an epithelial origin of the giant cells because all those examined had a negative reaction to cytokeratin. Foreign-body cells were characterized by cytoplasmic vacuoles and irregularly dispersed nuclei. They showed a focally circumscribed reaction mostly outside the connective tissue pseudocapsule of the tumours. The sarcomatoid osteoclast-like giant cell reactions in carcinomas were distinctly intermingled with the carcinomatous patterns. In contrast, the associated osteoclast-like giant cell tumour was distinctly separate from the salivary gland tumour tissue and was composed of numerous larger osteoclast-like giant cells with a greater number of nuclei (more than 20): these giant cells were uniformly distributed throughout the tumour tissue. The giant cell granuloma was also separate from the carcinoma and was composed of nests of smaller, more irregularly distributed giant cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0714.1997.tb00244.x
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  • 4
    Electronic Resource
    Electronic Resource
    Kraniale und zervikale Chordome (1998)
    Springer
    Mund-, Kiefer- und Gesichtschirurgie 2 (1998), S. 153-159 
    Details
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Typisches Chordom ; Pathohistologie ; Immunhistochemie ; Differentialdiagnose ; Key words Typical chordoma ; Pathohistology ; Immunohistochemistry ; Differential diagnosis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Cranial and cervical chordomas can spread by para- or retropharyngeal extension up to the region of the salivary glands or the jaw and may simulate a tumor of the salivary glands or jaw. In occasional cases, because the tumors often expand slowly, months or years may pass between the first clinical symptoms and diagnosis. Diagnostic problems exist in differentiating these chordomas from pleomorphic adenoma, mucinous carcinoma, or chondrosarcoma. Ten relevant observations of typical cranial and cervical chordomas (Salivary Gland Register Hamburg 1965–1996) were analyzed more closely by pathohistological and immunohistochemical means. The exact diagnosis is based upon the evidence of blown-up, bubble-like („physaliform“) cells which contain mucus drops in a vacuolized cytoplasm and are surrounded by extensive areas of mucoid mucus. The pattern of immunohistochemistry is characterized by the multifold expression of cytokeratin, vimentin, and EMA. The differential diagnosis is discussed with reference to further types of chordoma (chondroid chordoma, dedifferentiated chordoma with spindle cell sarcomatous transformation), chondrosarcoma, pleomorphic adenoma, and mucus-producing carcinoma.
    Notes: Kraniale und zervikale Chordome können sich bei para- oder retropharyngealer Ausbreitung bis zur Speicheldrüsen- oder Kieferregion ausbreiten und einen Speicheldrüsen- oder Kiefertumor vortäuschen. Da die Tumoren oft langsam wachsen, vergehen vom Auftreten der ersten klinischen Symptome bis zur Diagnosestellung mitunter Monate oder Jahre. Differentialdiagnostische Probleme bestehen in der Abgrenzung zu pleomorphen Adenomen, schleimbildenden Karzinomen oder Chondrosarkomen. 10 einschlägige Beobachtungen von typischen kranialen und zervikalen Chordomen des Speicheldrüsenregisters Hamburg (1965–1996) werden pathohistologisch und immunhistochemisch näher analysiert. Die exakte Diagnose beruht auf dem Nachweis von aufgeblähten blasenförmigen („physaliformen“) Zellen, welche in einem vakuolisierten Zytoplasma Schleimtropfen enthalten und von ausgedehnten mukoiden Schleimseen umgeben sind. Das immunhistochemische Expressionsmuster ist durch die Mehrfachexpression von Zytokeratin, Vimentin und EMA gekennzeichnet. Die Differentialdiagnose zu weiteren Chordomtypen (chondroides Chordom, entdifferenziertes Chordom mit spindelzelliger sarkomatöser Transformation), zum Chondrosarkom, pleomorphen Adenom und schleimbildenden Karzinom wird erörtert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100060050051
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  • 5
    Electronic Resource
    Electronic Resource
    Diagnostische „Fallstricke“ (“pitfalls”) bei benignen und malignen Speicheldrüsenkrankheiten (1998)
    Springer
    Mund-, Kiefer- und Gesichtschirurgie 2 (1998), S. 62-69 
    Details
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Nekrotisierende Sialometaplasie ; Metaplastischer Warthin-Tumor ; Sklerosierende polyzystische Sialadenopathie ; Primäre Speicheldrüsentumoren in Lymphknoten ; Speicheldrüsenmetastasen ; Chordome ; MALT-Lymphome ; Key words Nectrotizing sialometaplasia ; Metaplastic Warthin tumour ; Sclerosing polycystic sialadenopathy ; Primary salivary gland tumours in lymph nodes ; Metastases in the salivary glands ; Chordomas ; MALT lymphomas
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Diagnostic pitfalls exist when benign salivary gland diseases are mistakenly classified as malignant, with consequences for treatment and prognosis. Examples are necrotizing sialometaplasia, metaplastic Warthin tumour and sclerosing polycystic sialadenopathy. The proper diagnosis is of eminent importance to distinguish cases of primary tumours that have developed in salivary glands or their lymph nodes from cases of extraglandular tumours with metastases in these glands or their nodes. In these cases clinical data and additional immunocytochemical methods are necessary to clarify the exact diagnosis, especially when the primary salivary gland tumours have a structure largely identical to the metastases (e.g. squamous cell carcinoma). Nasopharyngeal or cervical chordomas can be mistaken for pleomorphic adenoma or mucinous adenocarcinoma. The initial stage of malignant MALT lymphomas in association with Sjögren’s syndrome demands identification of clonal rearrangement for therapeutic implication. The diagnostic criteria for proper classification are analysed in detail.
    Notes: „Fallstricke“ der Diagnostik liegen dann vor, wenn bei einer Reihe von Tumor-simulierenden, jedoch benignen Speicheldrüsenkrankheiten eine irrtümliche Klassifikation als maligner Tumor mit Konsequenzen für Therapie und Prognose vorgenommen wird. Beispiele hierfür sind die nekrotisierende Sialometaplasie, der metaplastische Warthin-Tumor und die sklerosierende polyzystische Sialadenopathie. Von eminent praktischer Bedeutung ist weiterhin die exakte Differentialdiagnose zwischen primär in den Speicheldrüsenlymphknoten entwickelten Speicheldrüsentumoren und Metastasen extraglandulärer Primärtumoren in den Speicheldrüsen oder deren Lymphknoten. Zur exakten Diagnosestellung sind sowohl die klinischen Daten als auch zusätzliche immunzytochemische Methoden erforderlich, besonders dann, wenn die Primärtumoren der Speicheldrüsen einen weitgehend identischen Aufbau mit den Metastasen aufweisen (z. B. Plattenepithelkarzinome). Nasopharyngeale und zervikale Chordome können zu Verwechslungen mit pleomorphen Adenomen oder muzinösen Adenokarzinomen führen. Die initialen Formen maligner MALT-Lymphome beim Sjögren-Syndrom lassen sich durch klonale Rearrangements frühzeitig für den Einsatz der Therapie erfassen. Die diagnostischen Kriterien zur exakten Klassifikation dieser „Fallstricke“ werden näher analysiert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100060050032
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  • 6
    Electronic Resource
    Electronic Resource
    Terminologie des epithel-myoepithelialen Karzinoms der Speicheldrüsen und des Adenomyoepithelioms der Brustdrüse (1997)
    Springer
    Der Onkologe 3 (1997), S. 666-671 
    Details
    ISSN: 1433-0415
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Unabhängig von der jeweiligen Organlokalisation sollten, im Rahmen einer international standardisierten WHO-Klassifikation, bei histologisch gleichartig aufgebauten Tumoren, identische Tumorbezeichnungen verwendet werden. Allerdings können sich durch organspezifische Faktoren der Funktion und der Struktur Unterschiede im biologischen Verhalten bezüglich der Prognose oder Therapie ergeben. Ein Beispiel für die differente Terminologie eines histologisch exakt definierten Tumors stellt das epithelial-myoepitheliale Karzinom der Speicheldrüsen dar, welches in der Brustdrüse nach wie vor als Adenomyoepitheliom bezeichnet, jedoch als „potentiell geringgradig maligne” eingestuft wird. Es soll daher in diesem Kommentar eine kritische Analyse über die Morphologie und das klinische Verhalten der beiden Tumoren vorgenommen und eine einheitliche Nomenklatur vorgeschlagen werden.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s007610050167
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  • 7
    Electronic Resource
    Electronic Resource
    Are adenomyoepithelioma of the breast and epithelial-myoepithelial carcinoma of the salivary glands identical tumours? (1998)
    Springer
    Virchows Archiv 433 (1998), S. 285-287 
    Details
    ISSN: 1432-2307
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004280050249
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  • 8
    Electronic Resource
    Electronic Resource
    Unusual choristoma of the parotid gland in a girl (1999)
    Springer
    Virchows Archiv 434 (1999), S. 355-359 
    Details
    ISSN: 1432-2307
    Keywords: Key words Choristoma (trichoadenoma) of parotid gland ; Skin-like or adnexal hair follicle tumours ; Ectodermally derived tissue
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract  An 8-year-old girl had a painless circumscribed nodule in the right parotid gland for 4 weeks. A tumour (1.3 cm diameter) within the salivary gland parenchyma showed small cystic spaces with horn-like material macroscopically. The tumour tissue contained solid squamous cell formations and cystic spaces limited by multilayered squamous epithelium and covered by layers of ortho- and parakeratotic cells. The cystic spaces contained keratotic lamellae. In some areas pin-like epithelial proliferations were seen. All epithelial cells were characterized by uniform nuclei, and no atypical mitoses were seen. Keratinizated masses with partial calcification were occasionally located in the interstitial tissue and replaced by multinucleated giant cells. The tumour was classified as a choristoma and resembled a trichoadenoma. The ectodermally derived oral and salivary gland epithelium may be the source of skin-like or adnexal tumours.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004280050352
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  • 9
    Electronic Resource
    Electronic Resource
    Electron spin resonance spectra: geometrical and electronic structure of endohedral fullerenes (1998)
    Springer
    Applied physics 66 (1998), S. 265-271 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 31.15.Ew; 61.48.+c; 87.64.Hd
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 82 , M = Sc, Y, La) are discussed. The first 13C hyperfine structure has been analyzed in detail and at least seven electronically different groups of carbon atoms could be assigned by simulations of the ESR spectra. The strong similarity of the 13C satellite structure suggests the preference of one cage isomer for the scandium group C82 endohedrals. The geometric structure and the electronic structure of all nine fullerene cage isomers of La@C82 were studied by approximate density-functional-based theoretical calculations. A C3v isomer was found as the most stable one. The manifold of 13C hyperfine coupling constants could be interpreted on the basis of the calculated spin density distributions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050665
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  • 10
    Electronic Resource
    Electronic Resource
    Theoretical investigations of homo- and heteronuclear bridged fullerene oligomers (1997)
    Springer
    Applied physics 64 (1997), S. 321-326 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 33.15.-e; 33.20.-t; 81.05Tp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: \chem{[C_{60}]_{\chemindex{n}}} -oligomers ( n=2 , 3 , and 4 ) as well as \chem{C_{60}} dimers partially bridged by oxygen atoms or a \chem{NH} group. The applicability of the scheme for finding the ground state of these systems was carefully checked against more sophisticated methods including an all-electron, self-consistent (SCF) scheme based on the local-density-approximation (LDA), and the recently developed generalized-gradient approximation (GGA). We present Raman intensities for the vibrations of the \chem{C_{60}} oligomers, obtained in the framework of the bond polarization model, and compare with recent experimental data.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050485
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