Landau-Zener-Stuckelberg interference in a multi-anticrossing system

We propose a universal analytical method to study the dynamics of a multi-anticrossing system subject to driving by one single large-amplitude triangle pulse, within its time scales smaller than the dephasing time. Our approach can explain the main features of the Landau-Zener-Stuckelberg interference patterns recently observed in a tripartite system [Nature Communications 1:51 (2010)]. In particular, we focus on the effects of the size of anticrossings on interference and compare the calculated interference patterns with numerical simulations. In addition, Fourier transform of the patterns can extract information on the energy level spectrum.Comment: 6 pages, 5 figure

[μ-4-Benzoyl-1-(1-oxido-2-naphthyl­carbon­yl)thio­semicarbazidato(4−)]bis­[pyridine­copper(II)]

In the title dinuclear complex, [Cu2(C19H11N3O3S)(C5H5N)2], the two CuII centers have different coordination environments, viz. N2OS and N2O2, each exhibiting a distorted square-planar geometry. π–π inter­actions between the aromatic rings of neighbouring complexes [centroid–centroid distance = 3.856 (5) Å] link pairs of mol­ecules into centrosymmetric dimers, which are further packed into stacks along the b axis with relatively short Cu⋯Cu separations of 3.482 (1) Å. Weak inter­molecular C—H⋯N hydrogen bonds help to consolidate the crystal packing

Bis[μ-N′-acetyl-1-oxidonaphthalene-2-carbohydrazidato(3−)]tetra­pyridine­tricopper(II)

There are two half-mol­ecules in the asymmetric unit of the title compound, [Cu3(C13H9N2O3)2(C5H5N)4], and crystallographic inversion symmetry completes each trinuclear mol­ecule. In both mol­ecules, the central Cu atom (site symmetry ) adopts a distorted trans-CuO2N4 octa­hedral geometry, arising from its coordination by two N,O-bidentate aroylhydrazine ligands and two pyridine mol­ecules. The peripheral Cu atoms adopt trans-CuN2O2 square-planar coordinations arising from an N,O,O-tri­dentate ligand (that also bonds to the central Cu atom) and a pyridine mol­ecule

A data analysis method for isochronous mass spectrometry using two time-of-flight detectors at CSRe

The concept of isochronous mass spectrometry (IMS) applying two time-of-flight (TOF) detectors originated many years ago at GSI. However, the corresponding method for data analysis has never been discussed in detail. Recently, two TOF detectors have been installed at CSRe and the new working mode of the ring is under test. In this paper, a data analysis method for this mode is introduced and tested with a series of simulations. The results show that the new IMS method can significantly improve mass resolving power via the additional velocity information of stored ions. This improvement is especially important for nuclides with Lorentz factor $\gamma$-value far away from the transition point $\gamma _t$ of the storage ring CSRe.Comment: published in Chinese Physics C Vol. 39, No. 10 (2015) 10620

Detection and identification of enterohemorrhagic Escherichia coli O157:H7 and Vibrio cholerae O139 using oligonucleotide microarray

<p>Abstract</p> <p>Background</p> <p>The rapid and accurate detection and identification of the new subtype of the pathogens is crucial for diagnosis, treatment and control of the contagious disease outbreak. Here, in this study, an approach to detect and identify <it>Escherichia coli </it>O157:H7 and <it>Vibrio cholerae </it>O139 was established using oligonucleotide microarray. We coupled multiplex PCR with oligonucleotide microarray to construct an assay suitable for simultaneous identification of two subtypes of the pathogens.</p> <p>Results</p> <p>The <it>stx</it>1, <it>stx</it>2 gene and <it>uid</it>A gene having the specific mutant spot were chosen as the targets for <it>Escherichia coli </it>O157:H7, and meanwhile the <it>ctx</it>A, <it>tcp</it>A, and <it>LPSgt </it>gene for <it>Vibrio cholerae </it>O139. The oligonucleotide microarray was composed of eight probes including negative control and positive control from 16S rDNA gene. The six primers were designed to amplify target fragments in two triplex PCR, and then hybridized with oligonucleotide microarray. An internal control would be to run a PCR reaction in parallel. Multiplex PCR did not produce any non-specific amplicons when 149 related species or genera of standard bacteria were tested (100% specificity). In addition, <it>Escherichia coli </it>O157:H7 and <it>Escherichia coli </it>O157:non-H7, <it>Vibrio cholerae </it>O139 and <it>Vibrio cholerae </it>O1 had been discriminated respectively. Using recombinant plasmid and target pathogens, we were able to detect positive hybridization signals with 10²copies/μL and 10³cfu/mL per reaction.</p> <p>Conclusion</p> <p>The DNA microarray assay reported here could detect and identify <it>Escherichia coli </it>O157:H7 and <it>Vibrio cholerae </it>O139, and furthermore the subtype was distinguished. This assay was a specific and sensitive tool for simultaneous detection and identification of the new subtype of two pathogens causing diarrhea in human.</p