493 research outputs found
Lower Bound of Concurrence Based on Positive Maps
We study the concurrence of arbitrary dimensional bipartite quantum systems.
An explicit analytical lower bound of concurrence is obtained, which detects
entanglement for some quantum states better than some well-known separability
criteria, and improves the lower bounds such as from the PPT, realignment
criteria and the Breuer's entanglement witness.Comment: 8 pages, 1 figur
Matrix Tensor Product Approach to the Equivalence of Multipartite States under Local Unitary Transformations
The equivalence of multipartite quantum mixed states under local unitary
transformations is studied. A criterion for the equivalence of non-degenerate
mixed multipartite quantum states under local unitary transformations is
presented.Comment: 7 page
Lower Bounds of Concurrence for Tripartite Quantum Systems
We derive an analytical lower bound for the concurrence of tripartite quantum
mixed states. A functional relation is established relating concurrence and the
generalized partial transpositions.Comment: 10 page
IQMNMR: Open source software using time-domain NMR data for automated identification and quantification of metabolites in batches
<p>Abstract</p> <p>Background</p> <p>One of the most promising aspects of metabolomics is metabolic modeling and simulation. Central to such applications is automated high-throughput identification and quantification of metabolites. NMR spectroscopy is a reproducible, nondestructive, and nonselective method that has served as the foundation of metabolomics studies. However, the automated high-throughput identification and quantification of metabolites in NMR spectroscopy is limited by severe spectral overlap. Although numerous software programs have been developed for resolving overlapping resonances, as well as for identifying and quantifying metabolites, most of these programs are frequency-domain methods, considerably influenced by phase shifts and baseline distortions, and effective only in small-scale studies. Almost all these programs require multiple spectra for each application, and do not automatically identify and quantify metabolites in batches.</p> <p>Results</p> <p>We created IQMNMR, an R package that integrates a relaxation algorithm, digital filter, and similarity search algorithm. It differs from existing software in that it is a time-domain method; it uses not only frequency to resolve overlapping resonances but also relaxation time constants; it requires only one NMR spectrum per application; is uninfluenced by phase shifts and baseline distortions; and most important, yields a batch of quantified metabolites.</p> <p>Conclusions</p> <p>IQMNMR provides a solution that can automatically identify and quantify metabolites by one-dimensional proton NMR spectroscopy. Its time-domain nature, stability against phase shifts and baseline distortions, requirement for only one NMR spectrum, and capability to output a batch of quantified metabolites are of considerable significance to metabolic modeling and simulation.</p> <p>IQMNMR is available at <url>http://cran.r-project.org/web/packages/IQMNMR/</url>.</p
Separability of rank two quantum states on multiple quantum spaces
Explicit sufficient and necessary conditions for separability of
-dimensional rank two multiparty quantum mixed states are presented. A
nonseparability inequality is also given, for the case where one of the
eigenvectors corresponding to nonzero eigenvalues of the density matrix is
maximally entangled.Comment: 10 pages, Late
Isolation, identification, and complete genome sequence of a bovine adenovirus type 3 from cattle in China
<p>Abstract</p> <p>Background</p> <p>Bovine adenovirus type 3 (BAV-3) belongs to the <it>Mastadenovirus </it>genus of the family <it>Adenoviridae </it>and is involved in respiratory and enteric infections of calves. The isolation of BAV-3 has not been reported prior to this study in China. In 2009, there were many cases in cattle showing similar clinical signs to BAV-3 infection and a virus strain, showing cytopathic effect in Madin-Darby bovine kidney cells, was isolated from a bovine nasal swab collected from feedlot cattle in Heilongjiang Province, China. The isolate was confirmed as a bovine adenovirus type 3 by PCR and immunofluorescence assay, and named as HLJ0955. So far only the complete genome sequence of prototype of BAV-3 WBR-1 strain has been reported. In order to further characterize the Chinese isolate HLJ0955, the complete genome sequence of HLJ0955 was determined.</p> <p>Results</p> <p>The size of the genome of the Chinese isolate HLJ0955 is 34,132 nucleotides in length with a G+C content of 53.6%. The coding sequences for gene regions of HLJ0955 isolate were similar to the prototype of BAV-3 WBR-1 strain, with 80.0-98.6% nucleotide and 87.5-98.8% amino acid identities. The genome of HLJ0955 strain contains 16 regions and four deletions in inverted terminal repeats, E1B region and E4 region, respectively. The complete genome and DNA binding protein gene based phylogenetic analysis with other adenoviruses were performed and the results showed that HLJ0955 isolate belonged to BAV-3 and clustered within the <it>Mastadenovirus </it>genus of the family <it>Adenoviridae</it>.</p> <p>Conclusions</p> <p>This is the first study to report the isolation and molecular characterization of BAV-3 from cattle in China. The phylogenetic analysis performed in this study supported the use of the DNA binding protein gene of adenovirus as an appropriate subgenomic target for the classification of different genuses of the family <it>Adenoviridae </it>on the molecular basis. Meanwhile, a large-scale pathogen and serological epidemiological investigations for BVA-3 infection might be carried out in cattle in China. This report will be a good beginning for further studies on BAV-3 in China.</p
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