12,595 research outputs found
Effect of Inclusion Rate of Silage With or Without the Presence of Alpha-Amylase on Feedlot Performance, Carcass Characteristics, and Efficiency Measures
The experimental objective was to determine the interactions of silage variety and inclusion level in cattle finishing diets on cattle performance and agronomic returns to cropland when fed to beef cattle
Warm-Dense Molecular Gas in the ISM of Starbursts, LIRGs and ULIRGs
The role of star formation in luminous and ultraluminous infrared galaxies is
a hotly debated issue: while it is clear that starbursts play a large role in
powering the IR luminosity in these galaxies, the relative importance of
possible enshrouded AGNs is unknown. It is therefore important to better
understand the role of star forming gas in contributing to the infrared
luminosity in IR-bright galaxies. The J=3 level of 12CO lies 33K above ground
and has a critical density of ~1.5 X 10^4 cm^-3. The 12CO(J=3-2) line serves as
an effective tracer for warm-dense molecular gas heated by active star
formation. Here we report on 12CO (J=3-2) observations of 17 starburst spirals,
LIRGs and ULIRGs which we obtained with the Heinrich Hertz Submillimeter
Telescope on Mt. Graham, Arizona.
Our main results are the following: 1. We find a nearly linear relation
between the infrared luminosity and warm-dense molecular gas such that the
infrared luminosity increases as the warm-dense molecular gas to the power
0.92; We interpret this to be roughly consistent with the recent results of Gao
& Solomon (2004a,b). 2. We find L_IR/M_H2 ratios ranging from ~10 to ~128
L_sun/M_sun using a standard CO-H2 conversion factor of 3 X 10^20 cm^-2 (K km
s^-1)^-1. If this conversion factor is ~an order of magnitude less, as
suggested in a recent statistical survey (Yao et al. 2003), then 2-3 of our
objects may have significant contributions to the L_IR by dust-enshrouded AGNs.Comment: 15 Pages, 2 figures, Accepted for Publication in Ap
Collapse of the Mott gap and emergence of a nodal liquid in lightly doped SrIrO
Superconductivity in underdoped cuprates emerges from an unusual electronic
state characterised by nodal quasiparticles and an antinodal pseudogap. The
relation between this state and superconductivity is intensely studied but
remains controversial. The discrimination between competing theoretical models
is hindered by a lack of electronic structure data from related doped Mott
insulators. Here we report the doping evolution of the Heisenberg
antiferromagnet SrIrO, a close analogue to underdoped cuprates. We
demonstrate that metallicity emerges from a rapid collapse of the Mott gap with
doping, resulting in lens-like Fermi contours rather than disconnected Fermi
arcs as observed in cuprates. Intriguingly though, the emerging electron liquid
shows nodal quasiparticles with an antinodal pseudogap and thus bares strong
similarities with underdoped cuprates. We conclude that anisotropic pseudogaps
are a generic property of two-dimensional doped Mott insulators rather than a
unique hallmark of cuprate high-temperature superconductivity
Electronic states on a twin boundary of a d-wave superconductor
We show that an induced -wave harmonic in the superconducting gap of an
orthorhombic superconductor strongly affects the excitation
spectrum near a twinning plane. In particular, it yields bound states of zero
energy with areal density proportional to the relative weight of the -wave
component. An unusual scattering process responsible for the thermal
conductivity across the twin boundary at low temperatures is also identified.Comment: 4 pages, ReVTEX, 2 PS-figure
The N-terminal intrinsically disordered domain of mgm101p is localized to the mitochondrial nucleoid.
The mitochondrial genome maintenance gene, MGM101, is essential for yeasts that depend on mitochondrial DNA replication. Previously, in Saccharomyces cerevisiae, it has been found that the carboxy-terminal two-thirds of Mgm101p has a functional core. Furthermore, there is a high level of amino acid sequence conservation in this region from widely diverse species. By contrast, the amino-terminal region, that is also essential for function, does not have recognizable conservation. Using a bioinformatic approach we find that the functional core from yeast and a corresponding region of Mgm101p from the coral Acropora millepora have an ordered structure, while the N-terminal domains of sequences from yeast and coral are predicted to be disordered. To examine whether ordered and disordered domains of Mgm101p have specific or general functions we made chimeric proteins from yeast and coral by swapping the two regions. We find, by an in vivo assay in S.cerevisiae, that the ordered domain of A.millepora can functionally replace the yeast core region but the disordered domain of the coral protein cannot substitute for its yeast counterpart. Mgm101p is found in the mitochondrial nucleoid along with enzymes and proteins involved in mtDNA replication. By attaching green fluorescent protein to the N-terminal disordered domain of yeast Mgm101p we find that GFP is still directed to the mitochondrial nucleoid where full-length Mgm101p-GFP is targeted
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