865 research outputs found
Implant strategies for finishing calves
Two hundred-sixteen Angus and Angus-cross
steer calves (690 lb) were used in a 129-
day finishing study to evaluate different implant
strategies, including an experimental new
implant for feedlot cattle that contains 28 mg of
estradiol benzoate and 200 mg of trenbolone
acetate (EBTBA). Treatments were 1)
nonimplanted control, 2) implanted and
reimplanted with Synovex-Sfi, 3) single initial
implant with EBTBA, 4) single initial implant
with Revalor-Sfi, 5) implanted with Synovex-S
and reimplanted with EBTBA, and 6) implanted
and reimplanted with EBTBA. Initial implants
and reimplants were administered on day 0 and
63, respectively. All implant treatments
increased feed intake, slaughter and carcass
weights, and rate and efficiency of gain.
Compared with other implant treatments, the
use of EBTBA as a reimplant treatment (trts 5
and 6) resulted in improved (P<.08) rate and
efficiency of gain and heavier carcass weights
(P<.07). However, only 58.3% of cattle in trts
5 and 6 graded Choice vs. 86.1% for controls
and 80.6% for steers implanted twice with
Synovex-S (P<.07). Carcasses were more
masculine (P<.07) for steers in trts 5 and 6 than
for nonimplanted controls, steers implanted with
Revalor-S, and steers implanted twice with
Synovex-S. Performance of steers implanted
once with EBTBA did not differ from that of
steers implanted once with Revalor-S or twice
with Synovex-S, but carcasses were more
masculine (P<.07) for EBTBA vs. Revalor-S
steers. Implant treatment
did not affect meat tenderness, as
measured by Warner-Bratzler shear force
determinations. Single EBTBA or Revalor-S
implants resulted in performance and carcass
traits similar to those resulting from implanting
twice with Synovex-S
Oxygen defect in YBa\u3csub\u3e2\u3c/sub\u3eCu\u3csub\u3e3\u3c/sub\u3eO\u3csub\u3ex\u3c/sub\u3e: An x-ray photoemission approach
A combined x-ray photoemission and diamagnetic-susceptibility study of YBa2Cu3Ox with xâ6 and 7 has been performed, with emphasis on the oxygen defect and the effect of heating in vacuum. By comparing spectra taken at these two oxygen contents, the core levels observed in the O 1s and Ba 4d spectral range are identified. Peak-intensity analysis indicates (1) that the oxygen released during the in situ heating is derived from or near the Cu-O-Cu-O chains of YBa2Cu3O7 and (2) that there is a random distribution of oxygen defects in or near these chains leading to two chemically dissimilar barium atoms even in single-orthorhombic-phase samples
Parent concerns for child development following admission to neonatal intensive or special care: From birth to adolescence
First published: 04 June 2022Aim: To describe the presence and nature of parent concerns regarding the development of their children admitted to Australian neonatal units(NNUs), comprising neonatal intensive care or special care. Methods: In a cross-sectional survey, mothers and fathers provided information regarding concerns for their childâs development. The self-administered survey was completed by two separate cohorts; (i) parents of child graduates from Australian NNUs (n=381); (ii) parents of infantâsinpatient in two South Australian NNUs (n=209). Data were analysed using thematic analysis and descriptive statistics. Results: Information was provided for 730 children. Developmental concern was reported for 39% of NNU graduates and 35% of inpatients. Chil-dren born very preterm (< 32 weeksâgestation) elicited greater parent concern than those born more mature (Cohort 1: 41% vs 36%; Cohort 2:49% vs 22%), including in multiple developmental domains (Cohort 1: 17% vs 15%; Cohort 2: 28% vs 4%). Parents with inpatient infants were predominantly concerned about general development-milestones (19.1%) and the potential impact of medical or CNS issues (13.7%). Graduate parents commonly focused on specific domains, such as their childâs speech-language (13.7%) and motor (12.9%) development.Conclusion: Neurodevelopment is a substantial source of concern for mothers and fathers during NNU admission and childhood, particularly for children born very preterm. However, in the first year of life, developmental concerns are poorly defined. This highlights the need for clinical education resources detailing infant developmental expectations and supportive strategies for parents of these high-risk infantsMegan L Bater, Michael J Stark, Jacqueline F Gould, Peter J Anderson, and Carmel T Collin
Disordered Hubbard Model with Attraction: Coupling Energy of Cooper Pairs in Small Clusters
We generalize the Cooper problem to the case of many interacting particles in
the vicinity of the Fermi level in the presence of disorder. On the basis of
this approach we study numerically the variation of the pair coupling energy in
small clusters as a function of disorder. We show that the Cooper pair energy
is strongly enhanced by disorder, which at the same time leads to the
localization of pairs.Comment: revtex, 5 pages, 6 figure
Understorey plant community and light availability in conifer plantations and natural hardwood forests in Taiwan
Questions: What are the effects of replacing mixed species natural forests with Cryptomeria japonica plantations on understorey plant functional and species diversity? What is the role of the understorey light environment in determining understorey diversity and community in the two types of forest?
Location: Subtropical northeast Taiwan.
Methods: We examined light environments using hemispherical photography, and diversity and composition of understorey plants of a 35âyr C. japonica plantation and an adjacent natural hardwood forest.
Results: Understorey plant species richness was similar in the two forests, but the communities were different; only 18 of the 91 recorded understorey plant species occurred in both forests. Relative abundance of plants among different functional groups differed between the two forests. Relative numbers of shadeâtolerant and shadeâintolerant seedling individuals were also different between the two forest types with only one shadeâintolerant seedling in the plantation compared to 23 seedlings belonging to two species in the natural forest. In the natural forest 11 species of tree seedling were found, while in the plantation only five were found, and the seedling density was only one third of that in the natural forest. Across plots in both forests, understorey plant richness and diversity were negatively correlated with direct sunlight but not indirect sunlight, possibly because direct light plays a more important role in understorey plant growth.
Conclusions: We report lower species and functional diversity and higher light availability in a natural hardwood forest than an adjacent 30âyr C. japonica plantation, possibly due to the increased dominance of shadeâintolerant species associated with higher light availability. To maintain plant diversity, management efforts must be made to prevent localized losses of shadeâadapted understorey plants
Hubbard model versus t-J model: The one-particle spectrum
The origin of the apparent discrepancies between the one-particle spectra of
the Hubbard and t-J models is revealed: Wavefunction corrections, in addition
to the three-site terms, should supplement the bare t-J. In this way a
quantitative agreement between the two models is obtained, even for the
intermediate- values appropriate for the high-Tc cuprate superconductors.
Numerical results for clusters of up to 20 sites are presented. The momentum
dependence of the observed intensities in the photoemission spectra of
Sr2CuO2Cl2 are well described by this complete strong-coupling approach.Comment: 4 two-column RevTeX pages, including 4 Postscript figures. Uses epsf.
Accepted for publication in Physical Review B, Rapid Communicatio
Spitzer and Herschel Multiwavelength Characterization of the Dust Content of Evolved H II Regions
We have analyzed a uniform sample of 16 evolved H II regions located in a 2° Ă 2° Galactic field centered at (l,b) = (30°, 0°) and observed as part of the Herschel Hi-GAL survey. The evolutionary stage of these H II regions was established using ancillary radio-continuum data. By combining Hi-GAL PACS (70 ÎŒm, 160 ÎŒm) and SPIRE (250 ÎŒm, 350 ÎŒm, and 500 ÎŒm) measurements with MIPSGAL 24 ÎŒm data, we built spectral energy distributions of the sources and showed that a two-component gray-body model is a good representation of the data. In particular, wavelengths >70 ÎŒm appear to trace a cold dust component, for which we estimated an equilibrium temperature of the big grains (BGs) in the range 20-30 K, while for λ < 70 ÎŒm, the data indicate the presence of a warm dust component at temperatures of the order of 50-90 K. This analysis also revealed that dust is present in the interior of H II regions, although likely not in a large amount. In addition, the data seem to corroborate the hypothesis that the main mechanism responsible for the (partial) depletion of dust in H II regions is radiation-pressure-driven drift. In this framework, we speculated that the 24 ÎŒm emission that spatially correlates with ionized gas might be associated with either very small grain or BG replenishment, as recently proposed for the case of wind-blown bubbles. Finally, we found that evolved H II regions are characterized by distinctive far-IR and submillimeter colors, which can be used as diagnostics for their identification in unresolved Galactic and extragalactic regions
Josephson Plasma in RuSr2GdCu2O8
Josephson plasma in RuSrGdCuO,
RuSrGdCuO (x = 0.3), and
RuSrEuCeCuO (x = 0.5) compounds is
investigated by the sphere resonance method. The Josephson plasma is observed
in a low-frequency region (around 8.5 cm at T ) for
ferromagnetic RuSrGdCuO, while it increases to 35 cm
for non-ferromagnetic RuSrGdCuO (x = 0.3), which
represents a large reduction in the Josephson coupling at ferromagnetic
RuO block layers. The temperature dependence of the plasma does not shift
to zero frequency ({\it i.e.} = 0) at low temperatures, indicating that
there is no transition from the 0-phase to the -phase in these compounds.
The temperature dependence and the oscillator strength of the peak are
different from those of other non-magnetic cuprates, and the origins of these
anomalies are discussed.Comment: to appear in Phys. Rev.B Rapid Com
Transport equations for the inflationary trispectrum
We use transport techniques to calculate the trispectrum produced in
multiple-field inflationary models with canonical kinetic terms. Our method
allows the time evolution of the local trispectrum parameters, tauNL and gNL,
to be tracked throughout the inflationary phase. We illustrate our approach
using examples. We give a simplified method to calculate the superhorizon part
of the relation between field fluctuations on spatially flat hypersurfaces and
the curvature perturbation on uniform density slices, and obtain its
third-order part for the first time. We clarify how the 'backwards' formalism
of Yokoyama et al. relates to our analysis and other recent work. We supply
explicit formulae which enable each inflationary observable to be computed in
any canonical model of interest, using a suitable first-order ODE solver.Comment: 24 pages, plus references and appendix. v2: matches version published
in JCAP; typo fixed in Eq. (54
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