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We present data on charged kaons (K±) and ϕ mesons in Au(1.23A GeV)+Au collisions. It is the first simultaneous measurement of K− and ϕ mesons in central heavy-ion collisions below a kinetic beam energy of 10A GeV. The ϕ/K− multiplicity ratio is found to be surprisingly high with a value of 0.52±0.16 and shows no dependence on the centrality of the collision. Consequently, the different slopes of the K+ and K− transverse-mass spectra can be explained solely by feed-down, which substantially softens the spectra of K− mesons. Hence, in contrast to the commonly adapted argumentation in literature, the different slopes do not necessarily imply diverging freeze-out temperatures of K+ and K− mesons caused by different couplings to baryons.
A central motivation for the development of x-ray free-electron lasers has been the prospect of time-resolved single-molecule imaging with atomic resolution. Here, we show that x-ray photoelectron diffraction—where a photoelectron emitted after x-ray absorption illuminates the molecular structure from within—can be used to image the increase of the internuclear distance during the x-ray-induced fragmentation of an O2 molecule. By measuring the molecular-frame photoelectron emission patterns for a two-photon sequential K-shell ionization in coincidence with the fragment ions, and by sorting the data as a function of the measured kinetic energy release, we can resolve the elongation of the molecular bond by approximately 1.2 a.u. within the duration of the x-ray pulse. The experiment paves the road toward time-resolved pump-probe photoelectron diffraction imaging at high-repetition-rate x-ray free-electron lasers.
Zum Screening auf Bence Jones-Proteinurie wird die Immunfixations-Elektrophorese (IFE) des unkonzentrierten Harnes empfohlen. Aufgrund einer Nachweisempfindlichkeit für freie Leichtketten zwischen 9 und 65 mg/1 werden die klinisch relevanten Bence Jones-Proteinurien erfaßt.
Der VK-Wert der Intraassay-Präzision der IFE zum Bence Jones-Proteinnachweis beträgt 12 %, derjenige der Interassay-Präzision 30%.
Mit der Ausbildung eines Zonenphänomens in der IFE beim Screening auf Bence Jones-Proteinurie muß gerechnet werden, wenn die Bence Jones-Proteinausscheidung vom Kappa-Typ über 1,4 g/l und vom Lambda-Typ über 0,7 g/l beträgt.
Die Konzentrationsbestimmung von Bence Jones-Protein sollte mit der Biuret-Methode erfolgen. Mit der Coomassie Brilliant Blau G 250-Methode wird Bence Jones-Protein nur in sehr unterschiedlichem Ausmaß erfaßt.
Die Neuregelung der Qualitätssicherung für Hormone und Pharmaka gemäß den Qualitätssicherungsrichtlinien der Bundesärztekammer (Rili-BÄK) unterliegt einer intensiven Diskussion, besonders in Hinsicht auf die Praktikabilität Für die ärztlichen Laboratorien und die Diagnostikahersteller ergeben sich erhebliche Veränderungen, die aufgezeigt werden.