898 research outputs found
Cloning and sequencing of the cDNA encoding for a Na+/H+ exchanger from Xenopus laevis oocytes (Xl-NHE)1The nucleotide sequence reported in this paper has been submitted to the EMBL, GenBank and DDBJ NucleotideSequence Database under the Accession number Y08635.1
AbstractWe have cloned and sequenced the cDNA for a Na+/H+ exchanger (NHE) from Xenopus laevis oocytes. This cDNA contains an open reading frame encoding a protein of 782 amino acids with 12 putative transmembrane domains and a long cytoplasmic tail. The protein exhibits a strong homology at the amino acid level to the human NHE-1 as well as to the βNHE from trout red blood cells: 69% and 58% respectively. Two potential N-linked glycosylation sites at Asn56 and Asn351 were identified. Three potential protein kinase C phosphorylation sites at the cytoplasmic tail were identified at Ser494, Thr726 and Ser747. RT-PCR revealed the expression of the Xl-NHE in Xenopus heart, reticulocytes and skeletal muscle. Š 1997 Elsevier Science B.V. All rights reserved
A near-field study on the transition from localized to propagating plasmons on 2D nano-wedges
In this manuscript we report on a near-feld study of two-dimensional
plasmonic gold nano-wedges using electron energy loss spectroscopy in
combination with scanning transmission electron microscopy, as well as
discontinuous Galerkin time-domain computations. With increasing nano-wedge
size, we observe a transition from localized surface plasmons on small
nano-wedges to non-resonant propagating surface plasmon polaritons on large
nano-wedges. Furthermore we demonstrate that nano-wedges with a groove cut can
support localized as well as propagating plasmons in the same energy range
Onwards and upwards: European Journal of Medical Research continues as an open access publication
The well-established European Journal of Medical Research has joined BioMed Central's portfolio of journals in January 2012, converting to the open access publishing model. Since its launch in 1995 the journal has been a print-only publication; from now on, it continues as an open access, online-only journal. The conversion to open access opens up the potential for the journal to become a leading, globally visible title in the field of general medicine over the coming years
Attraction: Transnational Municipal Climate Networks and Green City Branding
Abstract In this article, we investigate the nexus of green city branding and municipal climate networks. In recent decades, a number of formal transnational municipal climate networks have emerged and their membership continues to increase. In parallel, city branding that is based on green policies, has gained importance. Based on quantitative and qualitative data, we assess how and to what extent German cities use their membership in transnational municipal climate networks to communicate green city brands. In contrast to our expectations, we encountered very few indications of green city branding efforts by German cities. Our analysis shows that in general, branding considerations only play a negligible role in the involvement of cities in transnational municipal climate networks or climate policies. Instead, it seems that German cities use their membership in climate networks, to genuinely improve local climate change strategies. We therefore suggest that research on green city branding should be more sensitive to the particular context of cities and efforts should be made to unveil the underlying motives for the communication of green policies
A statistical MMN reflects the magnitude of transitional probabilities in auditory sequences
Within the framework of statistical learning, many behavioural studies
investigated the processing of unpredicted events. However, surprisingly few
neurophysiological studies are available on this topic, and no statistical
learning experiment has investigated electroencephalographic (EEG) correlates
of processing events with different transition probabilities. We carried out
an EEG study with a novel variant of the established statistical learning
paradigm. Timbres were presented in isochronous sequences of triplets. The
first two sounds of all triplets were equiprobable, while the third sound
occurred with either low (10%), intermediate (30%), or high (60%) probability.
Thus, the occurrence probability of the third item of each triplet (given the
first two items) was varied. Compared to high-probability triplet endings,
endings with low and intermediate probability elicited an early anterior
negativity that had an onset around 100âms and was maximal at around 180âms.
This effect was larger for events with low than for events with intermediate
probability. Our results reveal that, when predictions are based on
statistical learning, events that do not match a prediction evoke an early
anterior negativity, with the amplitude of this mismatch response being
inversely related to the probability of such events. Thus, we report a
statistical mismatch negativity (sMMN) that reflects statistical learning of
transitional probability distributions that go beyond auditory sensory memory
capabilities
Lueders Theorem for Coherent-State POVMs
Lueders theorem states that two observables commute if measuring one of them
does not disturb the measurement outcomes of the other. We study measurements
which are described by continuous positive operator-valued measurements (or
POVMs) associated with coherent states on a Lie group. In general, operators
turn out to be invariant under the Lueders map if their P- and Q-symbols
coincide. For a spin corresponding to SU(2), the identity is shown to be the
only operator with this property. For a particle, a countable family of
linearly independent operators is identified which are invariant under the
Lueders map generated by the coherent states of the Heisenberg-Weyl group, H_3.
The Lueders map is also shown to implement the anti-normal ordering of creation
and annihilation operators of a particle.Comment: 14 pages, no figure
Influence of process gas during powder bed fusion with laser beam of Zr-based bulk metallic glasses
Zr-based bulk metallic glasses offer a unique combination of hardness, high strength, and high elastic limits. Yet, manufacturable size and
complexity are limited due to the required cooling rates. Short laser-material interaction times together with layer-wise and selective energy input
allows the laser powder bed fusion process to largely overcome those restrictions. Still, the complex process-material interactions inhere numerous
uncertainties. In the present work, additively manufactured Zr-based bulk metallic glasses produced under three different process gases are
investigated by calorimetry, x-ray diffraction, and bending tests. A strong dependence between the thermophysical properties, flexural strength,
and the applied atmosphere is found
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