1,321 research outputs found
Effect of EAZI-BREED CIDR on reproductive efficiency in seasonally anestrous mated ewes (Year 3)
To demonstrate the use of the EAZI-BREED CIDR in ewe reproductive management 6 d, 9 d, or 12 d insertion of the EAZI-BREED CIDR on seasonally anestrous ewes in the Upper Midwest
Effect of EAZI-BREED CIDR on reproductive efficiency in seasonally anestrous mated ewes (Year 3)
To demonstrate the use of the EAZI-BREED CIDR in ewe reproductive management 6 d, 9 d, or 12 d insertion of the EAZI-BREED CIDR on seasonally anestrous ewes in the Upper Midwest
Effect of EAZI-BREED CIDR on reproductive efficiency in seasonally anestrous mated ewes (Year 3)
To demonstrate the use of the EAZI-BREED CIDR in ewe reproductive management 6 d, 9 d, or 12 d insertion of the EAZI-BREED CIDR on seasonally anestrous ewes in the Upper Midwest
Effect of EAZI-BREED CIDR on reproductive efficiency in seasonally anestrous mated ewes (Year 3)
To demonstrate the use of the EAZI-BREED CIDR in ewe reproductive management 6 d, 9 d, or 12 d insertion of the EAZI-BREED CIDR on seasonally anestrous ewes in the Upper Midwest
Effect of sorting and feeding management practices on finished lamb shrink loss
To determine the effect of common pre-marketing sorting and feeding management practices on finished lamb shrink loss
Dry matter intake, feed efficiency and animal growth response to treated corn stover inclusion in lamb finishing diets
To evaluate the effect of varying levels of treated corn stover on the dry matter intake and growth performance of growing lambs
Effect of EAZI-BREED CIDR on reproductive efficiency in seasonally anestrous mated ewes (Year 1)
To demonstrate the use of the EAZI-BREED CIDR in ewe reproductive management, and evaluate the effect of EAZI-BREED CIDR insertion period of 6 or 12 d on reproductive efficiency in seasonally anestrous ewes in the Upper Midwest
Oxide formation at the surface of late 4d transition metals: Insights from first-principles atomistic thermodynamics
Using density-functional theory we assess the stability of bulk and surface
oxides of the late 4d transition metals in a ``constrained equilibrium'' with a
gas phase formed of O2 and CO. While the stability range of the most stable
bulk oxide extends for ruthenium well into gas phase conditions representative
of technological CO oxidation catalysis, this is progressively less so for the
4d metals to its right in the periodic system. Surface oxides could
nevertheless still be stable under such conditions. These thermodynamic
considerations are discussed in the light of recent experiments, emphasizing
the role of (surface) oxides as the active phase of model catalysts formed from
these metals.Comment: 7 pages including 3 figures, Related publications can be found at
http://www.fhi-berlin.mpg.de/th/paper.htm
Titrimetric determination of zirconium
A brief literature survey on the present gravimetric, colorimetric, spectrographic, and volumetric methods for the determination of zirconium has been presented
AxPcoords & parallel AxParafit: statistical co-phylogenetic analyses on thousands of taxa
Background
Current tools for Co-phylogenetic analyses are not able to cope with the continuous accumulation of phylogenetic data. The sophisticated statistical test for host-parasite co-phylogenetic analyses implemented in Parafit does not allow it to handle large datasets in reasonable times. The Parafit and DistPCoA programs are the by far most compute-intensive components of the Parafit analysis pipeline. We present AxParafit and AxPcoords (Ax stands for Accelerated) which are highly optimized versions of Parafit and DistPCoA respectively.
Results
Both programs have been entirely re-written in C. Via optimization of the algorithm and the C code as well as integration of highly tuned BLAS and LAPACK methods AxParafit runs 5–61 times faster than Parafit with a lower memory footprint (up to 35% reduction) while the performance benefit increases with growing dataset size. The MPI-based parallel implementation of AxParafit shows good scalability on up to 128 processors, even on medium-sized datasets. The parallel analysis with AxParafit on 128 CPUs for a medium-sized dataset with an 512 by 512 association matrix is more than 1,200/128 times faster per processor than the sequential Parafit run. AxPcoords is 8–26 times faster than DistPCoA and numerically stable on large datasets. We outline the substantial benefits of using parallel AxParafit by example of a large-scale empirical study on smut fungi and their host plants. To the best of our knowledge, this study represents the largest co-phylogenetic analysis to date.
Conclusion
The highly efficient AxPcoords and AxParafit programs allow for large-scale co-phylogenetic analyses on several thousands of taxa for the first time. In addition, AxParafit and AxPcoords have been integrated into the easy-to-use CopyCat tool
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