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Search Results: 1 - 10 of 178041 matches for " B Zhou "
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Environmental, genetic and cellular toxicity of tenuazonic acid isolated from Alternaira alternata
B Zhou, S Qiang
African Journal of Biotechnology , 2008,
Abstract: Alternaria alternata, an important pathogen of many plants, produces tenuazonic acid (TeA) with bioactivity to microbes, plants and animals. TeA is one of the main mycotoxin to humans and other organisms. Using Chlamydomonas reinhardtii, Vicia faba root tip and three mammalian normal cell lines as target materials, environmental toxicity, genetic toxicity and cytotoxicity of TeA were examined. The growth and chlorophyll concentration of C. reinhardtii were inhibited at above 100 g/ml concentration, with EC50(G) of 310.36 g/ml and EC50(Chl) of 294.27 g/ml. The micronuleus test results indicated that MCN‰ was >15‰ only at higher concentrations. TeA inhibited the proliferation and total protein contents of 3T3 mouse fibroblasts (3T3 cells), Chinese hamster lung cells (CHL cells) and human hepatocytes (L-O2 cells) at concentrations ranging from 12.5 - 400 g/ml. Of the three cell lines, 3T3 cells were the most sensitive to the toxin (EC50(24h) = 41.64 g/ml), followed by CHL cells (EC50(24h) = 59.33 g/ml), and L-O2 cells (EC50(24h) = 85.98 g/ml) had the lowest sensitivity.
Resistance of superconductor-normal metal-superconductor junctions
F. Zhou,B. Spivak
Physics , 1996,
Abstract: It is shown that the conductance of a superconductor-normal metal-superconductor junction can exhibit a significant dependence on the phase of the superconducting order parameter in the situation when the size of the normal region of the junction is much larger than the normal metal coherence length and the critical current of the junction is already exponentially small. The period of the conductance oscillations as a function of the phase can be equal to $\pi$ or $2\pi$ depending on parameters of the system.
Hall effect in NS and SNS junctions
F. Zhou,B. Spivak
Physics , 1997,
Abstract: Hall effect in SN and SNS junctions is considered. It is shown that at small temperature the Hall voltage is significantly suppressed as compared to its normal metal value. The time dependence of the Hall voltage in SNS junctions has a form of narrow pulses with the Josephson frequency.
Negative superfluid densities in superconducting films in a parallel magnetic field
F. Zhou,B. Spivak
Physics , 1998,
Abstract: In this paper we develop a theory of mesoscopic fluctuations in disordered thin superconducting films in a parallel magnetic field. At zero temperature and sufficiently strong magnetic field the system undergoes a phase transition into a state characterized by a superfluid density, which is random in sign. Consequently, in this region, random supercurrents are spontaneously created in the ground state of the system, and it belongs to the same universality class as the two dimensional XY spin glass with a random sign of the exchange interaction.
Signless laplacian characteristic polynomials of regular graph transformations
Jianping Li,B. Zhou
Mathematics , 2013,
Abstract: Let $G$ be a simple $r$-regular graph with $n$ vertices and $m$ vertices. We give the signless Laplacian characteristic polynomials of $xyz$-transformations $G^{xyz}$ of $G$ in terms of $n$, $m$, $r$ and the signless Laplacian spectrum of $G$.
Multilocus Sequence Typing of the Guangdong Isolates of Riemerella anatipestifer from Ducks in China  [PDF]
B. F. Zhu, Mike Chao, X. F. Yang, D. Zhou
Open Journal of Animal Sciences (OJAS) , 2015, DOI: 10.4236/ojas.2015.53037
Abstract: It is a very important significance to explore the bacterial typing methods rapidly, accurately and understand the genetic relation between isolates for controlling effectively the disease and preventing the dissemination and diffusion of the pathogen. The changes in the genetic material nucleotide sequences result in variation and evolution of bacteria, the development of molecular biology and genomics make typing of bacteria from phenotype to molecular typing. Riemerella anatipestifer is the causative agent of polyserositis of ducks and geese. We studied 54 isolates of Riemerella anatipestifer from Guangdong in China by multicolor sequence typing (MLST). The result showed that 54 isolates of Riemerella anatipestifer were divided into 14 STs, and among E3, b12xiao and Cb1 three isolates have with independent of type STs. It was found that there was high homology of RA and low genetic variability in the same area. The synonymous mutation and non synonymous mutation rate: dN/dS in seven housekeeping genes was lower than 0.25. Cluster analysis showed that the 54 isolates were clustered into 5 groups. eBRUST analysis showed that all isolates were clustered into one Group. It also proved that the genetic relationship was very closed in duck plague pathogen in this area; the source may be the same ancestors.
Treatment of Non Melanoma Skin Cancers: An Intra-Comparison Study of CuradermBEC5 and Various Established Modalities  [PDF]
K. Cham, A. Cham, T. Chase, V. Zhou, B. Cham
Journal of Cancer Therapy (JCT) , 2015, DOI: 10.4236/jct.2015.612114
Abstract: Dermatologists, surgeons, oncologists and radiotherapists usually jointly manage skin cancers. The strengths and limitations of the established procedures are known. A new naturally derived topical cream, CuradermBEC5, for the treatment of non melanoma skin cancers has previously been described. In this communication, intra-comparison treatments of skin cancer between CuradermBEC5 therapy and the established treatments, surgery, radiation therapy, laser therapy, photodynamic therapy, imiquimod cream and cryosurgery are presented. Non melanoma skin cancer cases that had previously been treated unsuccessfully with the established procedures were subsequently treated successfully with CuradermBEC5. These observations are interesting because the identical lesions were treated by various modalities. In addition to the superior efficacious outcome of CuradermBEC5 therapy versus the established treatments, the cosmetic end results with CuradermBEC5 treatment are remarkable.
Nonsteady dynamic properties of a domain wall for the creep state under an alternating driving field
N. J. Zhou,B. Zheng
Physics , 2014, DOI: 10.1103/PhysRevE.90.012104
Abstract: With Monte Carlo simulations, the nonsteady dynamics properties of a domain wall have been systematically investigated for the thermally activated creep state under an alternating driving field. Taking the driven random-field Ising model in two dimensions as an example, two distinct growth stages of the domain interface are identified with both the correlation length and roughness function. One stage belongs to the universality class of the random depositions, and the other to that of the quenched Edwards-Wilkinson equation. In the latter case, due to the dynamic effect of overhangs, the domain interface may exhibit an intrinsic anomalous scaling behavior, different from that of the quenched Edwards-Wilkinson equation.
Isochronal synchrony and bidirectional communication with delay-coupled nonlinear oscillators
Brian B. Zhou,Rajarshi Roy
Physics , 2006, DOI: 10.1103/PhysRevE.75.026205
Abstract: We propose a basic mechanism for isochronal synchrony and communication with mutually delay-coupled chaotic systems. We show that two Ikeda ring oscillators (IROs), mutually coupled with a propagation delay, synchronize isochronally when both are symmetrically driven by a third Ikeda oscillator. This synchronous operation, unstable in the two delay-coupled oscillators alone, facilitates simultaneous, bidirectional communication of messages with chaotic carrier waveforms. This approach to combine both bidirectional and unidirectional coupling represents an application of generalized synchronization using a mediating drive signal for a spatially distributed and internally synchronized multi-component system.
Dynamic effect of overhangs and islands at the depinning transition in two-dimensional magnets
N. J. Zhou,B. Zheng
Physics , 2012, DOI: 10.1103/PhysRevE.82.031139
Abstract: With the Monte Carlo methods, we systematically investigate the short-time dynamics of domain-wall motion in the two-dimensional random-field Ising model with a driving field ?DRFIM?. We accurately determine the depinning transition field and critical exponents. Through two different definitions of the domain interface, we examine the dynamics of overhangs and islands. At the depinning transition, the dynamic effect of overhangs and islands reaches maximum. We argue that this should be an important mechanism leading the DRFIM model to a different universality class from the Edwards-Wilkinson equation with quenched disorder
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