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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 66 (1998), S. S805 
    ISSN: 1432-0630
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 361 (1998), S. 547-553 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Surface analytical methods such as scanning electron microscopy (SEM), scanning force microscopy (SFM), energy dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS) were used to study the surface properties of amalgam substitutes as tooth filling materials. In particular the corrosion resistance of new gallium restorative materials was determined. To give relevant practical data, the measurements were performed before and after storing the alloys in artificial saliva to simulate physiological oral conditions. Subsequently an analysis of the artificial saliva was carried out with atomic emission spectroscopy with inductively coupled plasma (ICP-AES). Selective corrosion of different phases and a high gallium release could be determined.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Fresenius' journal of analytical chemistry 358 (1997), S. 64-66 
    ISSN: 1432-1130
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Surface analytical methods such as scanning electron microscopy (SEM), electron dispersive X-ray analysis (EDX), and X-ray photoelectron spectroscopy (XPS) were used to study the surface properties of several noble metal casting alloys which are used as core materials for fixed prosthodontics. In particular surface morphology, surface segregation, and oxide formation were studied as the key parameters influencing the adhesion properties between alloy and ceramic veneer.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Radiation and environmental biophysics 37 (1998), S. 95-100 
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract Lipid peroxidation induced by heavy ion irradiation was investigated in 1,2-dilinoleoyl-sn-glycero-3-phosphocholine (DLPC) liposomes. Lipid peroxidation was induced using accelerated heavy ions that exhibit linear energy transfer (LET) values between 30 and 15 000 keV/μm and doses up to 100 kGy. With increasing LET, the formation of lipid peroxidation products such as conjugated dienes, lipid hydroperoxides, and thiobarbituric acid-reactive substances decreased. When comparing differential absorption spectra and membrane fluidity following irradiation with heavy ions and x-rays (3 Gy/min), respectively, it is obvious that there are significant differences between the influences of densely and sparsely ionizing radiation on liposomal membranes. Indications for lipid fragmentation could be detected after heavy ion irradiation.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1939
    Keywords: Carbon dioxide enrichment ; Feeding preference ; Leaf quality ; Mesocosms ; Spodoptera eridania
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Results from laboratory feeding experiments have shown that elevated atmospheric carbon dioxide can affect interactions between plants and insect herbivores, primarily through changes in leaf nutritional quality occurring at elevated CO2. Very few data are available on insect herbivory in plant communities where insects can choose among species and positions in the canopy in which to feed. Our objectives were to determine the extent to which CO2-induced changes in plant communities and leaf nutritional quality may affect herbivory at the level of the entire canopy. We introduced equivalent populations of fourth instar Spodoptera eridania, a lepidopteran generalist, to complex model ecosystems containing seven species of moist tropical plants maintained under low mineral nutrient supply. Larvae were allowed to feed freely for 14 days, by which time they had reached the seventh instar. Prior to larval introductions, plant communities had been continuously exposed to either 340 μl CO2 l−1 or to 610 μl CO2 l−1 for 1.5 years. No major shifts in leaf nutritional quality [concentrations of N, total non-structural carbohydrates (TNC), sugar, and starch; ratios of: C/N, TNC/N, sugar/N, starch/N; leaf toughness] were observed between CO2 treatments for any of the species. Furthermore, no correlations were observed between these measures of leaf quality and leaf biomass consumption. Total leaf area and biomass of all plant communities were similar when caterpillars were introduced. However, leaf biomass of some species was slightly greater-and for other species slightly less (e.g. Cecropia peltata)-in communities exposed to elevated CO2. Larvae showed the strongest preference for C. peltata leaves, the plant species that was least abundant in all communites, and fed relatively little on plants species which were more abundant. Thus, our results indicate that leaf tissue quality, as described by these parameters, is not necessarily affected by elevated CO2 under relatively low nutrient conditions. Hence, the potential importance of CO2-induced shifts in leaf nutritional quality, as determinants of herbivory, may be overestimated for many plant communities growing on nutrient-poor sites if estimates are based on traditional laboratory feeding studies. Finally, slight shifts in the abundance of leaf tissue of various species occurring under elevated CO2 will probably not significantly affect herbivory by generalist insects. However, generalist insect herbivores appear to become more dependent on less-preferred plant species in cases where elevated CO2 results in reduced availability of leaves of a favoured plant species, and this greater dependency may eventually affect insect populations adversely.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1432-1904
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1434-3924
    Keywords: Schlüsselwörter ; Discus-articularis-Verlagerungen ; Arthroskopie ; Lysis & Lavage ; Key words ; Discus articularis ; Displacement ; Arthroscopy ; Lysis & Lavage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Displacement of the discus articularis with and without repositioning represents a common pathological alteration of the temporomandibular joint (tmj). The primary clinical symptoms are pain and reduced jaw movement. Particularly in cases of long-term complaints, conservative treatment methods such as splint and physiotherapy often do not produce the desired results. For these patients, arthroscopy combined with lysis and lavage is the treatment of choice for diagnostic as well as therapeutic purposes. In our department we performed this surgery on a total of 23 patients with discus displacement. With this low-risk procedure we achieved a definite improvement in symptoms in 20 patients; 11 of those patients were eventually complaint-free. Additionally, we can report a general improvement in opening the mouth. Except for a slight postoperative soft-tissue swelling, no complications developed. Thus, we can conclude that arthroscopic lysis and lavage, a low-risk and minimally invasive procedure, should be preferred to open arthrotomy in the primary treatment of tmj-displacements.
    Notes: Verlagerungen des Discus articularis mit und ohne Reposition stellen eine oft zu beobachtende pathologische Veränderung des Kiefergelenks dar. Klinisch stehen dabei Schmerzhaftigkeit und Einschränkungen der Unterkieferbewegungen im Vordergrund. Häufig können diese Beschwerden gerade bei längerem Bestehen durch konservative Behandlungsmaßnahmen wie eine Schienen- oder Physiotherapie nur geringfügig beeinflußt werden. Die Arthroskopie eröffnet hier in Kombination mit einer Lysis und Lavage sowohl diagnostische als auch therapeutische Möglichkeiten. An unserer Klinik wurden insgesamt 23 Patienten mit einer Diskusluxation arthroskopiert. Bei 20 Patienten konnte mit diesem risikoarmen Eingriff eine deutliche Besserung der Symptomatik, bei 11 davon sogar eine subjektive Beschwerdefreiheit erzielt werden. Auch funktionell konnte z. B. eine generelle Verbesserung der Mundöffnung erzielt werden. Abgesehen von geringfügigen postoperativen Weichteilschwellungen waren keine Komplikationen zu verzeichnen. Als Konsequenz unserer Ergebnisse sollten die arthroskopische Lysis und Lavage als risikoarmes, minimalinvasives Verfahren bei Diskusluxationen des Kiefergelenks primär einer offenen Arthrotomie vorgezogen werden.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Mund-, Kiefer- und Gesichtschirurgie 3 (1999), S. 320-324 
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Speicheldrüsenendoskopie ; Sialolithe ; Sialadenitis ; Minimalinvasive Verfahren ; Key words Sialoendoscopy ; Salivary calculi ; Sialadenitis ; Minimally invasive techniques
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary Videoendoscopy is a minimally invasive procedure for the diagnosis and therapy of sialopathies of the major salivary glands. The main indication is sialolithiasis of the submandibular and parotid glands. Sialoendoscopy offers, on the one hand, a diagnostic method for radiolucent calculi in particular and, on the other, can be used to simultaneously remove calculi. Furthermore, endoscopy is of high value for the diagnosis and treatment of other salivary gland diseases in which there are pathological changes of the ductal system. For example, regeneration of the gland is now possible in cases of chronic sialadenitis, due to the removal of a sialostenosis. Sialadenectomy can thereby be avoided.
    Notes: Zusammenfassung Die Videoendoskopie stellt ein minimalinvasives diagnostisches und therapeutisches Verfahren für Sialoadenopathien der großen Kopfspeicheldrüsen dar. Hauptindikation ist die Sialolithiasis der Glandula submandibularis sowie der Glandula parotis. Die Videoendoskopie ermöglicht hier einerseits die Diagnostik auch nicht röntgenopaker Speichelsteine und kann andererseits gleichzeitig therapeutisch zur Steinentfernung genutzt werden. Darüber hinaus stellt sie bei anderen Sialopathien mit pathologischen Veränderungen im Bereich des Gangsystems ebenfalls ein wertvolles Untersuchungs- und Behandlungsverfahren dar. So können beispielsweise bei chronischer Sialadenitis eine Regeneration der Drüse durch die endoskopische Beseitigung einer Speichelabflußbehinderung bewirkt und auf diese Weise eine alternativ erforderliche operative Drüsenentfernung vermieden werden.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Mund-, Kiefer- und Gesichtschirurgie 2 (1998), S. 58-61 
    ISSN: 1434-3940
    Keywords: Schlüsselwörter Plattenepithekarzinom ; Immunglobulin-Autoantikörper ; Immundefekt ; Key words Squamous cell cancer ; Ig autoantibodies ; Immune defect
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Squamous cell cancer of the oral cavity mainly occurs in older patients or in patients with alcohol or nicotine abuse. Younger patients are seldom involved. The case of a 27-year-old woman with a squamous cell cancer of the right cheek will be presented. Without any risk factors, an immune defect resulting in chronic Candida infection of the oral cavity seems to be responsible for the carcinogenesis.
    Notes: Plattenepithelkarzinome im Bereich der Mundhöhle treten meist bei älteren Patienten oder bei Patienten mit Alkohol- oder Nikotinabusus auf. Bei jüngeren Patienten werden diese selten beschrieben. Es wird über die Kasuistik einer 27jährigen Patientin mit einem Plattenepithelkarzinom im Bereich der rechten Wange berichtet. Bei fehlenden Risikofaktoren wird ein zellulärer Immundefekt und eine langjährig persistierende Candidainfektion für die Karzinogenese verantwortlich gemacht.
    Type of Medium: Electronic Resource
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