48,156 research outputs found
Transcription of brain natriuretic peptide and atrial natriuretic peptide genes in human tissues
We have compared the expression of atrial natriuretic peptide (ANP) and brain natriuretic peptide (BNP) genes in various human tissues using a quantitative polymerase chain reaction technique. Tissues of three human subjects, obtained at autopsy, were analyzed. BNP transcripts could be detected in the central nervous system, lung, thyroid, adrenal, kidney, spleen, small intestine, ovary, uterus, and striated muscle. ANP transcripts could also be demonstrated in various human extracardiac tissues including several endocrine organs. In all peripheral tissues, the level of both natriuretic peptide transcripts was approximately 1-2 orders of magnitude lower than in cardiac ventricular tissues. This distribution is in marked contrast to the much lower level of ANP and BNP transcripts present in extracardiac rat tissues (generally less than 1/1000 of ventricles). These data suggest differential expression of the two natriuretic peptide genes in cardiac and extracardiac tissues in man. Furthermore, the presence of local synthesis of ANP and BNP in various peripheral organs suggests paracrine and/or autocrine function of these natriuretic peptides
Approximate expression for the dynamic structure factor in the Lieb-Liniger model
Recently, Imambekov and Glazman [Phys. Rev. Lett. 100, 206805 (2008)] showed
that the dynamic structure factor (DSF) of the 1D Bose gas demonstrates
power-law behaviour along the limiting dispersion curve of the collective modes
and calculated the corresponding exponents exactly. Combining these recent
results with a previously obtained strong-coupling expansion we present an
interpolation formula for the DSF of the 1D Bose gas. The obtained expression
is further consistent with exact low energy exponents from Luttinger liquid
theory and shows nice agreement with recent numerical results.Comment: 4 pages, 3 figure
Non-Volatile Magnonic Logic Circuits Engineering
We propose a concept of magnetic logic circuits engineering, which takes an
advantage of magnetization as a computational state variable and exploits spin
waves for information transmission. The circuits consist of magneto-electric
cells connected via spin wave buses. We present the result of numerical
modeling showing the magneto-electric cell switching as a function of the
amplitude as well as the phase of the spin wave. The phase-dependent switching
makes it possible to engineer logic gates by exploiting spin wave buses as
passive logic elements providing a certain phase-shift to the propagating spin
waves. We present a library of logic gates consisting of magneto-electric cells
and spin wave buses providing 0 or p phase shifts. The utilization of phases in
addition to amplitudes is a powerful tool which let us construct logic circuits
with a fewer number of elements than required for CMOS technology. As an
example, we present the design of the magnonic Full Adder Circuit comprising
only 5 magneto-electric cells. The proposed concept may provide a route to more
functional wave-based logic circuitry with capabilities far beyond the limits
of the traditional transistor-based approach
Sterile neutrinos, dark matter, and the pulsar velocities in models with a Higgs singlet
We identify the range of parameters for which the sterile neutrinos can
simultaneously explain the cosmological dark matter and the observed velocities
of pulsars. To satisfy all cosmological bounds, the relic sterile neutrinos
must be produced sufficiently cold. This is possible in a class of models with
a gauge-singlet Higgs boson coupled to the neutrinos. Sterile dark matter can
be detected by the x-ray telescopes. The presence of the singlet in the Higgs
sector can be tested at the Large Hadron Collider.Comment: 4 pages, one figur
Magnetoconductivity in the presence of Bychkov-Rashba spin-orbit interaction
A closed-form analytic formula for the magnetoconductivity in the diffusive
regime is derived in the presence of Bychkov-Rashba spin-orbit interaction in
two dimensions. It is shown that at low fields B << B_{so}, where B_{so} is the
characteristic field associated with spin precession, D'yakonov-Perel'
mechanism leads to spin relaxation, while for B >> B_{so} spin relaxation is
suppressed and the resulting spin precession contributes a Berry phase-like
spin phase to the magnetoconductivity. The relative simplicity of the formula
greatly facilitates data fitting, allowing for the strength of the spin-orbit
coupling to be easily extracted
Strong eigenfunction correlations near the Anderson localization transition
We study overlap of two different eigenfunctions as compared with
self-overlap in the framework of an infinite-dimensional version of the
disordered tight-binding model. Despite a very sparse structure of the
eigenstates in the vicinity of Anderson transition their mutual overlap is
still found to be of the same order as self-overlap as long as energy
separation is smaller than a critical value. The latter fact explains
robustness of the Wigner-Dyson level statistics everywhere in the phase of
extended states. The same picture is expected to hold for usual d-dimensional
conductors, ensuring the form of the level repulsion at critical
point.Comment: 4 pages, RevTe
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