Quasirotational groundstate bands of even-even nuclei with 50≦N,Z≦82

The quasirotational groundstate bands of¹⁴⁰Sm,¹⁴²Sm,¹⁴⁴Gd and¹³⁶Nd have been determined by studying the prompt γ-decay after (α,xn+yp+zα.) reactions using α-particles of up to 104 MeV and targets of¹⁴⁴Sm,¹⁴²Nd,¹⁴¹Pr,¹⁴⁰Ce,¹³⁶Ce and¹³⁹La. The new levels continue the trends of the neighbouring even-even nuclides smoothly. These systematics of the groundstate bands in the region 50<N,Z<82 are not disturbed by expected subshell closure effects.     

Relativmessung der Elektronenpolarisation beimβ-Zerfall: Tl204 und P32

The ratio of longitudinal polarization values of Tl²⁰⁴ and P³² β-particles was measured by the method of double scattering. The result obtained is P(Tl²⁰⁴)/P(P³²)=0.993±0.036 at 540 keV. The low specific activity of the available Tl²⁰⁴ sources caused a considerable depolarization ofβ-particles by scattering in the source. The influence of depolarization was eliminated by using sources containing both nuclei in a chemical compound. The ratio of polarization values can then be calculated from the time dependence of the scattering asymmetry, as the half-lives of Tl²⁰⁴ and P³² differ considerably. An estimate is presented of the influence of inelastic scattering processes in the source on electron depolarization.     

Relativmessung der Elektronenpolarisation beim β-Zerfall: Au199 und P32

The ratio of longitudinal polarization values of Au¹⁹⁹ and P³² particles was measured by the method of double scattering. The result obtained isP(Au¹⁹⁹)/P(P³²)=0.83±0.05 at 310 keV for the ground state transition of Au¹⁹⁹.     

Intramitochondriale Deoxyribonukleinsäure in Säugetierzellen

p Hochgereinigte Mitochondrien aus Rattenleber, Rattenniere und Rinderherz enthalten 0,17–0,57, g Deoxyribonukleinsäure pro mg Mitochondrienprotein. Diese DNA-Menge ist weder auf Verunreinigung der Mitochondrienfraktionen mit Zellkernen noch auf Adsoptions-artefakte zurückzuführen. Die Mitochondrienfraktionen wurden durch differentielles Zentrifugieren und nachfolgende Flotation in einem mit Hilfe des Röntgenkontrastmittels Urografin hergestellten Dichtegradienten gereinigt. Deoxyribonukleinsäure ist als eine universelle Komponente von Mitochondrien anzusehen, die von genetischer Bedeutung sein dürfte. Highly purified mitochondria from liver and kidney of the rat as well as from bovine heart have been found to contain from 0.17 to 0.57 g deoxyribonucleic acid per mg mitochondrial protein. This amount of DNA is attributable neither to contamination of the mitochondrial fractions by nuclei nor to adsorption artefacts. Purification of the mitochondria was achieved by differential centrifugation and subsequent flotation in a density gradient of Urografin, an X-ray contrasting agent. It is suggested that deoxyribonucleic acid is a universal component of genetical importance in all mitochondria.Mit 3 Abbildungen     

Deformations and momentum-energy complexes

Summary Let be a simply connected region of an Einstein-Riemann space that is filled by the trajectories of a time-oriented normal congruence K. The most general form of the momentum-energy tensor is determined under the assumption that we know the deformation of the metric tensor under transport along K. The time-like eigenvector and associated eigenvalue of this momentum-energy tensor are examined.This paper is part of the RAND-Sponsored-Research studies in Epitactic Cosmography.