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  • 1
    Digitale Medien
    Digitale Medien
    Heavy fermion behavior of U2T2X compounds : The 6th joint magnetism and magnetic materials (MMM)-intermag conference (1994)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6214-6216 
    Details
    ISSN: 1089-7550
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Magnetic and specific-heat studies of U2T2X compounds show a frequent occurrence of the γ enhancement in conjunction with the onset of antiferromagnetic ordering. The largest value of 830 mJ/mol K2 was observed in U2Pt2In, which is nonmagnetic down to 1.2 K. Variations of electronic structure are documented by optimized relativistic LCAO calculation.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.358314
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  • 2
    Digitale Medien
    Digitale Medien
    The combined use of a singly charged ion beam and undulator radiation for photoelectron spectrometry studies on atomic ions : Proceedings of the 4th international conference on synchrotron radiation instrumentation (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 1389-1392 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We present the first photoelectron spectrometry experiment on a singly charged ion beam. Taking advantage of the high photon flux emitted in the undulator SU6 of Super-ACO, we have measured photoelectron spectra produced in the resonant photoionization of Ca+ ions at 33.2-eV photon energy. The success of this experiment depended strongly on the photon flux available. We demonstrate the capability of photoelectron spectrometry to precisely calibrate the photon spectrum emitted in the undulator.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1143077
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  • 3
    Digitale Medien
    Digitale Medien
    Nitrous oxide emissions from grass swards during the eighth year of elevated atmospheric pCO2 (Swiss FACE) (2003)
    Oxford, UK : Blackwell Science Ltd
    Global change biology 9 (2003), S. 0 
    Details
    ISSN: 1365-2486
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Biologie , Energietechnik , Geographie
    Notizen: Emissions of N2O were measured during the growth season over a year from grass swards under ambient (360 μL L−1) and elevated (600 μL L−1) CO2 partial pressures at the Free Air Carbon dioxide Enrichment (FACE) experiment, Eschikon, Switzerland. Measurements were made following high (56 g N m−2 yr−1) and low (14 g N m−2 yr−1) rates of fertilizer application, split over 5 re-growth periods, to Lolium perenne, Trifolium repens and mixed Lolium/Trifolium swards. Elevated pCO2 increased annual emissions of N2O from the high fertilized Lolium and mixed Lolium/Trifolium swards resulting in increases in GWP (N2O emissions) of 179 and 111 g CO2 equivalents m−2, respectively, compared with the GWP of ambient pCO2 swards, but had no significant effect on annual emissions from Trifolium monoculture swards. The greater emissions from the high fertilized elevated pCO2Lolium swards were attributed to greater below-ground C allocation under elevated pCO2 providing the energy for denitrification in the presence of excess mineral N. An annual emission of 959 mg N2O-N m−2 yr−1 (1.7% of fertilizer N applied) was measured from the high fertilized Lolium sward under elevated pCO2. The magnitude of emissions varied throughout the year with 84% of the total emission from the elevated pCO2Lolium swards measured during the first two re-growths (April–June 2001). This was associated with higher rainfall and soil water contents at this time of year. Trends in emissions varied between the first two re-growths (April–June 2001) and the third, fourth and fifth re-growths (late June–October 2000), with available soil NO3− and rainfall explaining 70%, and soil water content explaining 72% of the variability in N2O in these periods, respectively. Caution is therefore required when extrapolating from short-term measurements to predict long-term responses to global climate change. Our findings are of global significance as increases in atmospheric concentrations of CO2 may, depending on sward composition and fertilizer management, increase greenhouse gas emissions of N2O, thereby exacerbating the forcing effect of elevated CO2 on global climate. Our results suggest that when applying high rates of N fertilizer to grassland systems, Trifolium repens swards, or a greater component of Trifolium in mixed swards, may minimize the negative effect of continued increasing atmospheric CO2 concentrations on global warming.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1365-2486.2003.00654.x
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  • 4
    Digitale Medien
    Digitale Medien
    Crystal and molecular structure of tris(2,2'-bipyridyl)osmium(II) bis(hexafluorophosphate) (1991)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 2443-2444 
    Details
    ISSN: 1600-5759
    Quelle: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Thema: Chemie und Pharmazie , Geologie und Paläontologie , Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1107/S0108270191005929
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  • 5
    Digitale Medien
    Digitale Medien
    Cells Involved in the Immune Response XXXVII. Antigen-Specific Suppressor Cells, Capable of Secreting an Antigen-Specific Suppressor Factor, Migrate from the Thymus to the Spleen Following Primary Immunization (1990)
    Oxford, UK : Blackwell Publishing Ltd
    Scandinavian journal of immunology 32 (1990), S. 0 
    Details
    ISSN: 1365-3083
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: The splenic mononuclear cells (MNC) of rabbits 7-14 and 30-48 days following primary intravenous immunization with sheep erythrocytes generated large numbers of antibody-secreting or plaque-forming cells (PFC) in secondary immune responses induced in vitro, whereas the splenic MNC obtained from rabbits 18-30 days following primary intravenous immunization generated poor secondary immune responses (few PFC) in vitro. However, these latter splenic MNC depleted of T cells consistently generated many PFC in the secondary immune response in vitro. Furthermore, the splenic MNC of rabbits thymectomized prior to day 3 following primary intravenous immunization also generated good secondary immune responses in vitro, irrespective of the time of killing post-immunization, whereas the splenic MNC of rabbits thymectomized after day 7 following primary immunization generated poor secondary immune responses in vitro. These results indicate that the depressed ability of the splenic MNC, obtained from rabbits killed between days 18 and 30 post-primary immunization, to generate significant secondary immune responses in vitro is due to suppressor T cells. The suppressor cells are referred to as immune spleen suppressor cells or ISSC. It was demonstrated that the suppression by the ISSC is antigen-specific and that the ISSC secrete an antigen-specific suppressor factor referred to as immune spleen suppressor factor or ISSF. It is concluded that the ISSC are generated in the thymus within a few days following primary immunization, that they migrate to and infiltrate the spleen between days 3 and 7 following primary immunization, and that they suppress or down-regulate further antibody synthesis via the secretion, locally of ISSF.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-3083.1990.tb03203.x
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  • 6
    Digitale Medien
    Digitale Medien
    Synthesis and catalytic properties of substituted AlPO4-31 molecular sieves (1993)
    Springer
    Catalysis letters 19 (1993), S. 67-79 
    Details
    ISSN: 1572-879X
    Schlagwort(e): Aluminophosphate molecular sieves ; Si and/or Mn modification ; isomerization of 1-butene
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Notizen: Abstract Molecular sieve AlPO4-31 and substituted analogues (MnAPO-31,SAPO-31, MnAPSO-31) have been tested for their catalytic properties in the isomerization of 1-butene over 6 h time on stream at 743 K. The conversion of 1-butene proceeds selectively by either double bond or skeletal isomerization. MnAPSO-31 with a molar MnO/P2O5 ratio adjusted to 0.01 yields the highest percentage of isobutene whereas the parent AlPO4-31 leads almost completely to a double bond shift with only minor skeletal isomerization. The results are related to the acidity characteristics that were determined by ammonia thermodesorption. Deactivation is accompanied by a loss of selectivity for the skeletal isomerization.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00765202
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  • 7
    Digitale Medien
    Digitale Medien
    Caries susceptibility and renal excretion of calcium (1992)
    Springer
    Journal of molecular medicine 70 (1992), S. 735-739 
    Details
    ISSN: 1432-1440
    Schlagwort(e): Kidney ; Calcium ; Phosphate ; Sodium ; Caries
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Clearance studies were performed for 2 days in two groups of age-matched young female volunteers: those with low caries prevalence and those with high caries prevalence. Both groups were kept on a low-calcium diet for 1 week and received 0.5 g calcium at the beginning of the second day. In both groups, glomerular filtration rate, urinary flow rate and renal excretions of sodium, calcium, and phosphate were subject to significant circadian variations. In both groups the administration of calcium led to a significant increase in renal excretion of sodium and calcium and a significant decrease in that of phosphate. On the first day, calcium excretion was significantly greater in those with low caries prevalence than in those with high caries prevalence, pointing to altered calcium homeostasis in this group.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00180739
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  • 8
    Digitale Medien
    Digitale Medien
    Beschleunigungsverletzung der HWS beim gurtgeschützten PKW-Fahrer (2000)
    Springer
    Der Unfallchirurg 103 (2000), S. 22-29 
    Details
    ISSN: 1433-044X
    Schlagwort(e): Schlüsselwörter PKW-Unfall • HWS Beschleunigungsverletzung • Beschwerdedauer • Verletzungsmechanismus • Prognostische Faktoren ; Key words Car accident • Acceleration related injury of the cervical spine • Duration of complaints • Injury mechanism • Prognostic factors
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary In an analysis of 3,838 restrained car drivers, the proportion of acceleration related injury of the cervical spine increased from under 10 % in 1985 to over 30 % in 1997. These injuries occurred mainly in the case of head-on or multiple collisions. Letters were sent to 1,136 of the injured persons, and of the 138 patients who returned the questionnaires, 121 (88 %) were still suffering from their symptoms. It was a question of pain (74 %), tension (6 %) and stiffness (5 %) in the head (27 %), neck (55 %) and shoulder (8 %) area. The duration of the complaints was the longest after multiple collisions. In addition to a slight influence of the accompanying injuries on the duration of complaints, the individual constitution seems to be an important determining factor. In order to resolve the difficulties of conducting of this retrospective study, prospective studies are necessary which include documentation of diagnosis, treatment protocols, duration and type of complaints.
    Notizen: Zusammenfassung Bei einer Unfallanalyse von 3.838 gurtgeschützten, angeschnallten PKW-Fahrern stieg der Anteil der HWS Beschleunigungsverletzung von unter 10 % 1985 auf über 30 % 1997. Überwiegend traten diese bei frontalen oder mehrfachen Kollisionen auf; 1.136 dieser Verletzten wurden angeschrieben, um Dauer und Art eventueller Beschwerden zu ermitteln. Von den 138 Patienten, die den Fragebogen zurücksendeten, gaben 121 (88 %) das Auftreten von Beschwerden an. Es handelte sich dabei um Schmerzen (74 %), Verspannungen (6 %) und Bewegungseinschränkungen (5 %) im Bereich von Kopf (27 %), Nacken (55 %) und Schulter (8 %). Die Dauer der Beschwerden war am längsten nach mehrfachen Kollisionen und einem Beschwerdebeginn nach mehr als 24 h. Neben einem geringen Einfluß der Begleitverletzungen auf die Beschwerdedauer sind auch die individuelle Konstitution und Schmerzverarbeitung wesentliche Faktoren. Auch bei dieser retrospektiven Untersuchung bestanden erhebliche Schwierigkeiten hinsichtlich der Nachuntersuchung. Zur Lösung dieses Problems sind prospektive Studien mit strengen Protokollen bezüglich der Erfassung von Diagnosestellung, Behandlung, Beschwerdedauer und -art erforderlich.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001130050004
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  • 9
    Digitale Medien
    Digitale Medien
    Die Entstehung von Beckenringverletzungen im Straßenverkehr Medizinisch-technische Unfallanalyse (2000)
    Springer
    Der Unfallchirurg 103 (2000), S. 267-274 
    Details
    ISSN: 1433-044X
    Schlagwort(e): Schlüsselwörter PKW-Unfall ; Beckenringverletzung ; Verletzungsmechanismus ; Klassifikation ; Prävention ; Key words Car accident ; Pelvic injury ; Injury mechanism ; Classification ; Prevention
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Abstract During 1985 and 1993, 7,410 persons were injured in traffic accidents in the area of Hanover. Of these, 306 (4.1%) sustained a pelvic girdle injury. In 139 cases (45%), the pelvic girdle injuries were further classified (Pennal and Tile) and a technical reconstruction of the accident situation was performed. 52% were type A, 27% type B and 21% type C injuries. Some 47% of the casualties were vehicle occupants, 31% pedestrians, 12% motorcyclists and 10% cyclists. In restrained vehicle occupants pelvic girdle injuries occurred mostly in accidents with a delta-v of more than 30 km/h, whereas in unrestrained vehicle occupants, pedestrians and cyclists they also occurred with lower delta-v or collision speed. The percentage of type B and C injuries increased with higher velocities. In addition to further improvements in passive safety, lower collision speed or delta-v is necessary to reduce or prevent pelvic girdle injuries. The reconstruction of pelvic girdle injury mechanism in traffic accidents is possible, when both technical and medical parameters are considered.
    Notizen: Zusammenfassung Zwischen 1985 und 1993 wurden 7.410 Verkehrsunfallverletzte im Großraum Hannover erfaßt; 306 (4,1%) erlitten eine Beckenringverletzung mit einem AIS〉2. In 139 (45%) Fällen erfolgte die Klassifikation der Beckenringverletzung nach Pennal und Tile und eine vollständige technische Rekonstruktion; 52% waren danach Typ-A-, 27% Typ-B- und 21% Typ-C-Verletzungen. Bei den Verletzten handelte es sich um 46% PKW-Insassen, 31% Fußgänger, 12% Motorradfahrer, 10% Fahrradfahrer und 1% LKW-Insassen. Die Beckenringverletzungen traten bei gurtgeschützten Fahrzeuginsassen fast ausschließlich bei einem Δ-v von über 30 km/h auf, dagegen bei ungeschützten Verkehrsteilnehmern (Fußgänger und Radfahrer) und bei nicht gurtgeschützten Fahrzeuginsassen auch schon bei Anprallgeschwindigkeiten bzw. Δ-v von 10–20 km/h. Bei höheren Geschwindigkeiten stieg der Anteil der B- und C-Verletzungen. Neben weiteren Verbesserungen der passiven Sicherheit ist zur Verminderung oder Vermeidung von Beckenringverletzungen eine Verringerung der “Unfallgeschwindigkeit” nötig. Unter Berücksichtigung aller technischen und klinischen Parameter wird eine Rekonstruktion des tatsächlichen Unfallmechanismus von Beckenringverletzungen ermöglicht.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001130050535
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  • 10
    Digitale Medien
    Digitale Medien
    Ein Herpes-simplex-Virus Typ 1-induzierter „Tumor” im Vestibulum nasi (2000)
    Springer
    HNO 48 (2000), S. 147-151 
    Details
    ISSN: 1433-0458
    Schlagwort(e): Schlüsselwörter ; Herpesviren ; Immunsuppression ; Resistenzentwicklung ; Key words ; Herpes virus ; Immunosuppression ; Treatment resistance
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Beschreibung / Inhaltsverzeichnis: Summary Herpes simplex viruses are known to be among the most common disease-causing microorganisms. Their prevalence can exceed 90% depending on the socioeconomic status of the population. Since the number of immunocompromised patients has increased because of the increased incidence in the acquired immunodeficiency syndrome and an increase in organ transplantation, herpes virus infection may have a greater clinical significance. While treatment of otherwise healthy individuals will not usually cause any clinical problems herpes infection in an immunocompromised patient can have severe consequences. Additionally, development of viral resistance can be observed that may require alternative drugs in treatment. We present a case history of a man with a B-cell chronic lymphocytic leukemia that was associated with a very unusual herpes simplex virus infection in the nasal vestibule. Possible causes for the development of resistance in herpes infections and the use of famciclovir and forscarnet as two therapeutic alternatives to aciclovir are discussed.
    Notizen: Zusammenfassung Herpes-simplex-Viren gehören weltweit zu den häufigsten Krankheitserregern des Menschen mit einer in Abhängigkeit vom sozioökonomischen Status vorhandenen Prävalenz von über 90%. Das Bild der Herpesinfektion hat mit Zunahme der aus unterschiedlichsten Gründen (Organtransplantation, AIDS etc.) immunsupprimierten Patienten deutlich an Vielfalt gewonnen. Während die Therapie des immungesunden Patienten i. allg. keine Schwierigkeiten bereitet, kann eine Herpesinfektion bei immunsupprimierten Patienten zu einem ernsten eine Behandlung erforderlich machenden Krankheitsbild führen. Außerdem werden Resistenzentwicklungen beobachtet, die eine Therapie mit alternativen Medikamenten erforderlich machen. Wir stellen einen Patienten mit einer sehr ungewöhnlichen Manifestation einer Herpes-simplex-Infektion im Vestibulum nasi im Rahmen einer chronisch-lymphatischen B-Zell-Leukämie vor. Die möglichen Ursachen einer Resistenzentwicklung bei Herpesviren werden diskutiert und mit Famciclovir und Foscarnet zwei therapeutische Alternativen zum Aciclovir vorgestellt.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s001060050023
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