3,188 research outputs found
Tritium spelta L. – Suebian crop? An ethnographic hypothesis on genetic trial
Until the 20th century, spelt (Triticum spelta) was the traditional wheat used in the North-West of the Iberian Peninsula. A recently proposed ethnographic thesis states that this cereal was a vestige and heritage of the Germanic Suebi kingdom that established in Gallecia between 410 and 584. The present study aims to verify the mentioned thesis and to draw conclusions about possible migrations routes of the suebians.
The genetic comparison included Triticum spelta L. samples of North-West-Iberian origin and a large number of samples from other Eurasian regions, including alleged suebian homeland regions (e.g. Suabia/Germany) before they immigrated in the Peninsula. An approximately 1-kb sequence, including a part of the promoter and the coding region of the high molecular-weight (HMW) glutenin B1-1 subunit gene of 48 accessions were analysed by allelic differentiation. The mutual similarities between all sequences were determined by multiple alignment and using the Neighbor Joining clustering method (Bionumerics software).
Our data show that Iberian, Mediterranean and Eurasian varieties clearly shared genetic similarities, whereas the varieties from Central and North Europe grouped in other clusters. We therefore suggest that this cereal was not a vestige of the Germanic Suebi kingdom that established in Gallecia.Fundação para a Ciência e a Tecnologia (FCT) - POCI 2010; POCI/HEC/56971/2004.FEDER
A novel strong coupling expansion of the QCD Hamiltonian
Introducing an infinite spatial lattice with box length a, a systematic
expansion of the physical QCD Hamiltonian in \lambda = g^{-2/3} can be
obtained. The free part is the sum of the Hamiltonians of the quantum mechanics
of spatially constant fields for each box, and the interaction terms
proportional to \lambda^n contain n discretised spatial derivatives connecting
different boxes. As an example, the energy of the vacuum and the lowest scalar
glueball is calculated up to order \lambda^2 for the case of SU(2) Yang-Mills
theory.Comment: Talk given at the 6th International Workshop on "Critical Point and
Onset of Deconfinement (CPOD)", Dubna, Russia, 23-29 August 201
Strong magnetic coupling of an ultracold gas to a superconducting waveguide cavity
Placing an ensemble of ultracold atoms in the near field of a
superconducting coplanar waveguide resonator (CPWR) with one can
achieve strong coupling between a single microwave photon in the CPWR and a
collective hyperfine qubit state in the ensemble with kHz larger than the cavity line width of
kHz. Integrated on an atomchip such a system constitutes a hybrid quantum
device, which also can be used to interconnect solid-state and atomic qubits,
to study and control atomic motion via the microwave field, observe microwave
super-radiance, build an integrated micro maser or even cool the resonator
field via the atoms
Observation of shock waves in a large Bose-Einstein condensate
We observe the formation of shock waves in a Bose-Einstein condensate
containing a large number of sodium atoms. The shock wave is initiated with a
repulsive, blue-detuned light barrier, intersecting the BEC, after which two
shock fronts appear. We observe breaking of these waves when the size of these
waves approaches the healing length of the condensate. At this time, the wave
front splits into two parts and clear fringes appear. The experiment is modeled
using an effective 1D Gross-Pitaevskii-like equation and gives excellent
quantitative agreement with the experiment, even though matter waves with
wavelengths two orders of magnitude smaller than the healing length are
present. In these experiments, no significant heating or particle loss is
observed.Comment: 7 pages, 7 figure
How Do Brazilian Street Youth Experience ‘The Street’?: Analysis Of A Sentence Completion Task
This study investigated how homeless Brazilian youth experience the street and examined factors linked to positive and negative feelings about the street. An opportunity sample of 35 boys and 34 girls aged 10–18 completed a structured interview and sentence completion task aimed at eliciting open-ended responses in a standardized manner. Analyses revealed great diversity in youths’ views of the street; moreover, in analyses controlling for age and gender, youth reporting feeling positive on the street differed from those who felt negative in reasons for leaving home, family situation and daily survival. The findings support the value of the sentence completion task in exploring the subjective experiences of street youth
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