43,692 research outputs found
Sedimentology and Mineralogy of Upper Proterozoic Playa-Lake Deposits in the Damara Orogen
No full textHome Intracontinental Fold Belts
Conference paper
Sedimentology and Mineralogy of Upper Proterozoic Playa-Lake Deposits in the Damara Orogen
H.-J. Behr, H. Ahrendt, H. Martin, H. Porada, J. Röhrs & K. Weber
Conference paper
264 Accesses
15 Citations
Abstract
A thick Proterozoic meta-playa sequence (Duruchaus Formation) is developed at the southern margin of the Damara Orogen. The meta-playa sediments exhibit a characteristic lithology and contain Palaeo-evaporitic minerals.
After hot nappes of metamorphic rocks had been thrust from the Damara Orogen onto the playa sequence, a mobilisation of evaporitic carbonate layers and a hydrothermal-metasomatic metamorphism took place. The deformation along the southern margin of the Damara Orogen is largely controlled by the diapiric activity of the mobilised evaporites.
The playa-sediments of the Duruchaus Formation correspond to similar rift deposits in other parts of Gondwana which all appear to be related to a phase of world-wide Proterozoic crustal stretching.
Stratiform copper deposits and specific hydrothermal mineral concentrations are related to the playa environment and the metamorphism of the playa sediments
Misleading and reliable markers to differentiate between primate testis-derived multipotent stromal cells and spermatogonia in culture
No full textGeologische Specialkarte von Preussen und den Thüringischen Staaten / 1947 Benkheim
No full textgeognost. und agronom. bearbeitet durch J. Behr, G. Fliegel und F. KaunhowenIndirektes handschriftliches Exlibris: "1912, 466", das ist K. geolog. Landesanstalt Berlin http://doi.org/10.24439/ethz-a-000006624 Exemplar der ETH-BI
Geologische Specialkarte von Preussen und den Thüringischen Staaten / 1953 Kerschken
No full textgeognost. und agronom. bearbeitet durch J. Behr u. H. Hess v. WichdorffIndirektes handschriftliches Exlibris: "1912, 466", das ist K. geolog. Landesanstalt Berlin http://doi.org/10.24439/ethz-a-000006624 Exemplar der ETH-BI
Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of meson decays to J/ψη and J/ψη′
No full textFirst evidence of the B 0 → J / ψ ω decay is found and the B s 0 → J / ψ η and B s 0 → J / ψ η ′ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 fb -1 collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of sqrt(s) = 7 TeV. The branching fractions of these decays are measured relative to that of the B 0 → J / ψ ρ 0 decay:frac(B (B 0 → J / ψ ω), B (B 0 → J / ψ ρ 0)) = 0.89 ± 0.19 (stat) - 0.13 + 0.07 (syst),frac(B (B s 0 → J / ψ η), B (B 0 → J / ψ ρ 0)) = 14.0 ± 1.2 (stat) - 1.5 + 1.1 (syst) - 1.0 + 1.1 (frac(f d, f s)),frac(B (B s 0 → J / ψ η ′), B (B 0 → J / ψ ρ 0)) = 12.7 ± 1.1 (stat) - 1.3 + 0.5 (syst) - 0.9 + 1.0 (frac(f d, f s)), where the last uncertainty is due to the knowledge of f d / f s, the ratio of b-quark hadronization factors that accounts for the different production rate of B 0 and B s 0 mesons. The ratio of the branching fractions of B s 0 → J / ψ η ′ and B s 0 → J / ψ η decays is measured to befrac(B (B s 0 → J / ψ η ′), B (B s 0 → J / ψ η)) = 0.90 ± 0.09 (stat) - 0.02 + 0.06 (syst)
Germ cell dynamics in the testis of the postnatal common marmoset monkey (Callithrix jacchus)
No full textThe seminiferous epithelium in the nonhuman primate Callithrix jacchus is similarly organized to man. This monkey has therefore been used as a preclinical model for spermatogenesis and testicular stem cell physiology. However, little is known about the developmental dynamics of germ cells in the postnatal primate testis. In this study, we analyzed testes of newborn, 8-week-old, and adult marmosets employing immunohistochemistry using pluripotent stem cell and germ cell markers DDX4 (VASA), POU5F1 (OCT3/4), and TFAP2C (AP-2γ). Stereological and morphometric techniques were applied for quantitative analysis of germ cell populations and testicular histological changes. Quantitative RT-PCR (qRT-PCR) of testicular mRNA was applied using 16 marker genes establishing the corresponding profiles during postnatal testicular development. Testis size increased during the first 8 weeks of life with the main driver being longitudinal outgrowth of seminiferous cords. The number of DDX4-positive cells per testis doubled between birth and 8 weeks of age whereas TFAP2C- and POU5F1-positive cells remained unchanged. This increase in DDX4-expressing cells indicates dynamic growth of the differentiated A-spermatogonial population. The presence of cells expressing POU5F1 and TFAP2C after 8 weeks reveals the persistence of less differentiated germ cells. The mRNA and protein profiles determined by qRT-PCR and western blot in newborn, 8-week-old, and adult marmosets corroborated the immunohistochemical findings. In conclusion, we demonstrated the presence of distinct spermatogonial subpopulations in the primate testis exhibiting different dynamics during early testicular development. Our study demonstrates the suitability of the marmoset testis as a model for human testicular development.</jats:p
The concept of the contemporary author in case of J. K. Rowling
No full textThe concept of the contemporary author in case of J. K. Rowling The diploma thesis deals with the contemporary concept of the author which is examined on the specific case of Joanne Kathleen Rowling. The theoretical part of the thesis focuses on the biography of the author and the previous philosophical theories concerning the concept of the author and his/her role in the identity of the literary work. The main authors of the theories are Roland Barthes, Michel Foucault, and Umberto Eco, whose concept is crucial for this thesis. The research part presents specific styles of writing which are characteristic for authors and applies this theory to the analysis of two literary works of J. K. Rowling. The conclusion of the thesis is the summary of the research and an attempt to define the concept of the contemporary author. Key words The author, authorship, literary work, pseudonym, the concept of the author, style of writing, J. K. Rowling, Robert Galbraith, Roland Barthes, Michel Foucault, Umberto Ec
Durch die Sprachbrille – Etische und emische Forschungsperspektiven nach der Migration
No full textNatarajan R. Durch die Sprachbrille – Etische und emische Forschungsperspektiven nach der Migration. In: Behr J, Conrad F, Kornmesser S, Tschernig K, eds. Schnittstellen der Germanistik. Festschrift für Hans Bickes. Berlin: Peter Lang ; 2020: 261–284
Silurian-Devonian and Jurassic Thermal Events in the Or dos Basin, China: Indications from K-Ar Dating on Illites
No full textIn the Ordos basin, two distinct thermal events of different ages have been identified for the first time by means of K–Ar dating combined with illite crystallinity analysis. For the Late Triassic and Late Permian samples, the K–Ar ages of the < 0.2 µm fractions (159-173 Ma) refleet an unitization age related to the Yanshanian movement and indicate a short thermal event in the Middle Jurassic; the K–Ar ages of the < 2 µm fractions (210-308 Ma) are interpreted as mixed ages of detrital material and authigenic illites. The K–Ar ages of both < 0.2 µm and < 2 µm fractions of a Middle Cambrian sample (368 Ma and 419 Ma) correspond to the ages of the metamorphism and earliest granite intrusion in the northern Caledonian Qinling fold zone (380-420 Ma) and show a thermal event during Silurian–Devonian time
Measurement of the B0–B0 oscillation frequency Δmd with the decays B0→D−π+ and B0→ J/ψK∗0
No full textThe B
0
–B
0
oscillation frequency Δmd is measured by the LHCb experiment using a dataset corresponding
to an integrated luminosity of 1.0 fb−1
of proton–proton collisions at √
s = 7 TeV, and is found to be
Δmd
=0.5156±0.0051 (stat.)±0.0033 (syst.) ps−1
. The measurement is based on results from analyses
of the decays B
0
→ D
−π
+ (D
−
→ K
+π
−π
−) and B
0
→ J/ψK
∗0
(J/ψ →μ
+μ
−,K
∗0
→ K
+π
−) and
their charge conjugated modes
- …
