1,753 research outputs found
Paul Bunyan
"[The book] is a scholarly and artistic production in which any westerner at all concerned in the recording of western culture may well take a peculiar and commendable local pride. Not because the book is the work of a western woman, or a study of a western folk-hero, or a by-product of a course of training in a western university, or the offering of a western publishing firm, though it is all of these things, but because it is a piece of decidedly excellent craftsmanship.
Identification of novel elements of the Drosophila blisterome sheds light on potential pathological mechanisms of several human diseases.
Main developmental programs are highly conserved among species of the animal kingdom. Improper execution of these programs often leads to progression of various diseases and disorders. Here we focused on Drosophila wing tissue morphogenesis, a fairly complex developmental program, one of the steps of which - apposition of the dorsal and ventral wing sheets during metamorphosis - is mediated by integrins. Disruption of this apposition leads to wing blistering which serves as an easily screenable phenotype for components regulating this process. By means of RNAi-silencing technique and the blister phenotype as readout, we identify numerous novel proteins potentially involved in wing sheet adhesion. Remarkably, our results reveal not only participants of the integrin-mediated machinery, but also components of other cellular processes, e.g. cell cycle, RNA splicing, and vesicular trafficking. With the use of bioinformatics tools, these data are assembled into a large blisterome network. Analysis of human orthologues of the Drosophila blisterome components shows that many disease-related genes may contribute to cell adhesion implementation, providing hints on possible mechanisms of these human pathologies
Superhard Phases of Simple Substances and Binary Compounds of the B-C-N-O System: from Diamond to the Latest Results (a Review)
The basic known and hypothetic one- and two-element phases of the B-C-N-O
system (both superhard phases having diamond and boron structures and
precursors to synthesize them) are described. The attention has been given to
the structure, basic mechanical properties, and methods to identify and
characterize the materials. For some phases that have been recently described
in the literature the synthesis conditions at high pressures and temperatures
are indicated.Comment: Review on superhard B-C-N-O phase
On the crystal lattice parameters of graphite-like phases of the B-C system
The structure of graphite-like BCx phases (x = 1, 1.5, 3, 4, 32) has been
studied using conventional X-ray diffraction. The results have been obtained,
which unambiguously point to turbostratic (one- dimensionally disordered)
structure of all phases under study. The crystal lattice parameters, sizes of
coherent scattering domains, and microstrain values have been defined, which
have allowed us to find a correlation between the structure and stoichiometry
of the phases synthesized at the same temperature
On the Hardness of a New Boron Phase, Orthorhombic {\gamma}-B28
Measurements of the hardness of a new high-pressure boron phase, orthorhombic
{\gamma}-B28, are reported. According to the data obtained, {\gamma}-B28 has
the highest hardness (~50 GPa) of all known crystalline modifications of boron
Paul Bunyan
"[The book] is a scholarly and artistic production in which any westerner at all concerned in the recording of western culture may well take a peculiar and commendable local pride. Not because the book is the work of a western woman, or a study of a western folk-hero, or a by-product of a course of training in a western university, or the offering of a western publishing firm, though it is all of these things, but because it is a piece of decidedly excellent craftsmanship.
Effect of nanostructuration on compressibility of cubic BN
Compressibility of high-purity nanostructured cBN has been studied under
quasi-hydrostatic conditions at 300 K up to 35 GPa using diamond anvil cell and
angle-dispersive synchrotron X-ray powder diffraction. A data fit to the Vinet
equation of state yields the values of the bulk modulus B0 of 375(4) GPa with
its first pressure derivative B0' of 2.3(3). The nanometer grain size (\sim20
nm) results in decrease of the bulk modulus by ~9%
Extraction of the pion distribution amplitude from polarized muon pair production
We consider the production of muon pairs from the scattering of pions on
longitudinally polarized protons. We calculate the cross section and the single
spin asymmetry for this process, taking into account pion bound state effects.
We work in the kinematic region where the photon has a large longitudinal
momentum fraction, which allows us to treat the bound state problem
perturbatively. Our predictions are directly proportional to the pion
distribution amplitude. A measurement of the polarized Drell-Yan cross section
thus allows the determination of the shape of the pion distribution amplitude.Comment: 13 pages, using revtex, two figures added separately as one uuencoded
Z-compressed fil
Acoustoelectric pumping through a ballistic point contact in the presence of magnetic fields
The acoustoelectric current, J, induced in a ballistic point contact (PC) by
a surface acoustic wave is calculated in the presence of a perpendicular
magnetic field, B. It is found that the dependence of the current on the Fermi
energy in the terminals is strongly correlated with that of the PC conductance:
J is small at the conductance plateaus, and is large at the steps. Like the
conductance, the acoustoelectric current has the same functional behavior as in
the absence of the field, but with renormalized energy scales, which depend on
the strength of the magnetic field, | B|.Comment: 7 page
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