982 resultados para Argon-36
Resumo:
Vorbesitzer: Karmeliterkloster Frankfurt am Main
Resumo:
Little is known about the noble gas abundances in comets. These highly volatile atoms are possible tracers of the history of cometary matter including the thermal evolution. They can help quantify the contribution of cometary impacts to terrestrial oceans and help elucidate on the formation history of comets and their role in the formation and evolution of planetary atmospheres. This paper focuses on argon and the capabilities to measure this noble gas with in situ mass spectrometry at comet 67P/Churyumov–Gerasimenko, the target of the European Space Agency׳s spacecraft Rosetta. Argon may have been detected by remote sensing in a single Oort cloud comet but to date nothing is known about the isotopic abundances of argon in comets. Furthermore, no detection of argon in a Jupiter-family comet has been reported. Comet 67P/Churyumov–Gerasimenko belongs to the group of Jupiter-family comets and originates most likely in the Kuiper belt. Onboard Rosetta is ROSINA/DFMS (Rosetta Orbiter Spectrometer for Ion and Neutral Analysis/Double Focusing Mass Spectrometer). DFMS has unprecedented mass resolution and high sensitivity and is designed to measure isotopic ratios including argon (Balsiger et al., 2007). Argon measurements using the DFMS lab model (identical to the flight model) demonstrate this capability. At very least, this mass spectrometer has the resolution and sensitivity to reduce the upper limit on the argon outgassing rate relative to water by more than three orders of magnitude (for 38Ar). Most likely, ROSINA/DFMS will provide the first detection of argon in a Jupiter-family comet together with the first determination of the ³⁶Ar/³⁸Ar ratio at a comet.
Resumo:
Welsch (Projektbearbeiter): Einstimmige Annahme des Antrages zur Aufhebung des bestehenden Eheverbotes zwischen Adligen und Nichtadligen sowie Personen unterschiedlicher Konfession
Resumo:
Welsch (Projektbearbeiter): Aufruf von 14 Urwählern des Berliner 71. Bezirks, nur solche Wahlmänner zu wählen, die den Staatsstreich des 9. November 1848 (Verlegung der Nationalversammlung nach Brandenburg) wieder rückgängig machen und eine Verfassung schaffen, welche im Unterschied zu der vom 5. Dezember 1848 kein Gnadengeschenk darstellt
Resumo:
Welsch (Projektbearbeiter): Zurückweisung eines ungarischen Ausbruchsversuches aus der belagerten Festung Komorn
Resumo:
BACKGROUND The noble gas xenon is considered as a neuroprotective agent, but availability of the gas is limited. Studies on neuroprotection with the abundant noble gases helium and argon demonstrated mixed results, and data regarding neuroprotection after cardiac arrest are scant. We tested the hypothesis that administration of 50% helium or 50% argon for 24 h after resuscitation from cardiac arrest improves clinical and histological outcome in our 8 min rat cardiac arrest model. METHODS Forty animals had cardiac arrest induced with intravenous potassium/esmolol and were randomized to post-resuscitation ventilation with either helium/oxygen, argon/oxygen or air/oxygen for 24 h. Eight additional animals without cardiac arrest served as reference, these animals were not randomized and not included into the statistical analysis. Primary outcome was assessment of neuronal damage in histology of the region I of hippocampus proper (CA1) from those animals surviving until day 5. Secondary outcome was evaluation of neurobehavior by daily testing of a Neurodeficit Score (NDS), the Tape Removal Test (TRT), a simple vertical pole test (VPT) and the Open Field Test (OFT). Because of the non-parametric distribution of the data, the histological assessments were compared with the Kruskal-Wallis test. Treatment effect in repeated measured assessments was estimated with a linear regression with clustered robust standard errors (SE), where normality is less important. RESULTS Twenty-nine out of 40 rats survived until day 5 with significant initial deficits in neurobehavioral, but rapid improvement within all groups randomized to cardiac arrest. There were no statistical significant differences between groups neither in the histological nor in neurobehavioral assessment. CONCLUSIONS The replacement of air with either helium or argon in a 50:50 air/oxygen mixture for 24 h did not improve histological or clinical outcome in rats subjected to 8 min of cardiac arrest.
Resumo:
Heinrich Graetz
Resumo:
Vorbesitzer: Dr. Becker; Arthur May; Städt. Historisches Museum Frankfurt am Main
Resumo:
Vorbesitzer: Bartholomaeusstift Frankfurt am Main
Resumo:
Trägerband: "Hauptschießen mit dem Stahlbogen... 1573 u. 1578"; Vorbesitzer: Stadtarchiv Frankfurt am Main
Resumo:
Vorbesitzer: Jakob Heller; Dominikanerkloster Frankfurt am Main
