Search CORE

341 research outputs found

Max Planck, Kiel und der Beginn der Quantentheorie: Mit einer Einführung zur Reihe Kieler Beiträge zu Max Planck

Author: Auge Oliver
Bonitz Michael
Publication venue
Publication date: 01/01/2024
Field of study

Dieser Band gibt einen Überblick zu Plancks Nachlass, dem diese Reihe gewidmet ist, verbunden mit ersten Sichtungs-Ergebnissen. Darüber hinaus erhält er einen Übersichtsartikel von Michael Bonitz, der Plancks Entdeckung und die daraus resultierende Entwicklung der Quantentheorie in kompakter Form und allgemeinverständlich zusammenfasst.This volume provides an overview of Planck's legacy, to which this series is dedicated, together with the first results of browsing the estate. In addition, it contains an overview article by Michael Bonitz, which summarizes Planck's discovery and the resulting development of quantum theory in a compact and generally understandable form

MACAU: Open Access Repository of Kiel University

Dynamic structure factor and excitation spectrum of the one‐component plasma: The case of weak to moderate magnetization

Author: Kählert Hanno
Bonitz Michael
Hanno Kählert
Michael Bonitz
Publication venue
Publication date: 01/01/2023
Field of study

Magnetized plasmas are well known to exhibit a rich spectrum of collective modes. Here, we focus on the density modes in dense or cold plasmas, where strong coupling effects alter the mode spectrum known from traditional weakly coupled plasmas. In particular, we study the dynamic structure factor (DSF) of the magnetized one-component plasma with molecular dynamics simulations. Extending our previous results (H. Kählert and M. Bonitz, Phys. Rev. Research 2022, 4, 013197), it is shown that Bernstein modes can be observed in the weakly magnetized regime, where they are found below the upper hybrid frequency, provided the coupling strength is sufficiently low. We investigate the DSF for a variety of different wave numbers and plasma parameters and show that even small magnetization can give rise to a strong zero-frequency mode perpendicular to the magnetic field and change the dispersion as well as the damping of the upper hybrid mode

Crossref

MACAU: Open Access Repository of Kiel University

Effect of the antioxidant idebenone on adverse events under mycophenolate mofetil therapy in a rat model

Author: Oellerich Michael
Bonitz Ulrike
Armstrong Victor William
Geide Anna
Heller Tanja
Wegner Ulrike
Groene Hermann-Josef
Publication venue
Publication date: 01/01/2008
Field of study

Background. Diarrhea and anemia are side effects of mycophenolic acid (MPA), but underlying mechanisms are not fully understood. Gene expression of major-alpha-hemoglobin and catalase was suppressed in livers of mycophenolate mofetil (MMF)-treated rats, suggesting MPA attenuates cellular defense against reactive oxygen species (ROS). We investigated whether the antioxidant idebenone might alleviate MPA-related side effects. Methods. Rats were treated as follows: group 1: controls; group 2: idebenone; group 3: MMF; and group 4: MMF/idebenone. Blood was collected weekly to determine cell counts, hemoglobin, MPA, plasma albumin, total protein, creatinine, and urea concentrations. On day 28 RNA was extracted from liver, kidneys, and bone marrow (BM). Colon and jejunum were examined histologically. Results. High-dose MMF-treated rats developed diarrhea, dehydration, and weight loss. After a week, a significant decrease (P=0.001) in erythrocyte count and hemoglobin concentration was observed that was not influenced by idebenone. Degenerative changes in the jejunum were slightly attenuated by idebenone. Idebenone did not influence MPA-induced suppression of catalase. A significant suppression of major-alpha-hemoglobin and the erythropoietin (EPO)-receptor in BM of MMF-treated groups and almost complete absence of hemopoietic progenitor cells were observed. EPO-mRNA was markedly upregulated in the MMF-group and even more in the MMF/idebenone-group. Conclusion. Idebenone showed minimal benefit on MMF-related diarrhea and anemia. BM of MMF-treated rats revealed erythroid aplasia as a possible reason for anemia. Marked upregulation of EPO-mRNA presumably reflects a compensatory mechanism. Because ROS have the potential to suppress EPO expression, it can be hypothesized that enhanced EPO-mRNA expression in MMF/idebenone-treated rats is caused by antagonism of ROS

GRO.publications (Univ. Göttingen)

Kondolenzschreiben bezüglich Max Plancks Tod von Ernst Zimmer

Author: Zimmer Ernst
Publication venue
Publication date: 22/04/2025
Field of study

Scan des Kondolenzschreibens an Marga Planck anlässlich des Todes von Max Planck am 4.10.1947. Mehr Informationen zu den Kondolenzen sind in Band 2 der Reihe Kieler Beiträge zu Max Planck zu finden. Eine Kurzdarstellung zu Max Planck und weitere Referenzen finden sich in Band 1

opendata@uni-kiel