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Search Results: 1 - 10 of 19388 matches for " Phan Ke Long "
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Diversity of Xenorhabdus and Photorhabdus spp. and Their Symbiotic Entomopathogenic Nematodes from Thailand
Aunchalee Thanwisai,Sarunporn Tandhavanant,Natnaree Saiprom,Nick R. Waterfield,Phan Ke Long,Helge B. Bode,Sharon J. Peacock,Narisara Chantratita
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0043835
Abstract: Xenorhabdus and Photorhabdus spp. are bacterial symbionts of entomopathogenic nematodes (EPNs). In this study, we isolated and characterized Xenorhabdus and Photorhabdus spp. from across Thailand together with their associated nematode symbionts, and characterized their phylogenetic diversity. EPNs were isolated from soil samples using a Galleria-baiting technique. Bacteria from EPNs were cultured and genotyped based on recA sequence. The nematodes were identified based on sequences of 28S rDNA and internal transcribed spacer regions. A total of 795 soil samples were collected from 159 sites in 13 provinces across Thailand. A total of 126 EPNs isolated from samples taken from 10 provinces were positive for Xenorhabdus (n = 69) or Photorhabdus spp. (n = 57). Phylogenetic analysis separated the 69 Xenorhabdus isolates into 4 groups. Groups 1, 2 and 3 consisting of 52, 13 and 1 isolates related to X. stockiae, and group 4 consisting of 3 isolates related to X. miraniensis. The EPN host for isolates related to X. stockiae was S. websteri, and for X. miraniensis was S. khoisanae. The Photorhabdus species were identified as P. luminescens (n = 56) and P. asymbiotica (n = 1). Phylogenenic analysis divided P. luminescens into five groups. Groups 1 and 2 consisted of 45 and 8 isolates defined as subspecies hainanensis and akhurstii, respectively. One isolate was related to hainanensis and akhurstii, two isolates were related to laumondii, and one isolate was the pathogenic species P. asymbiotica subsp. australis. H. indica was the major EPN host for Photorhabdus. This study reveals the genetic diversity of Xenorhabdus and Photorhabdus spp. and describes new associations between EPNs and their bacterial symbionts in Thailand.
Casimir interactions in strained graphene systems
Anh D. Phan,The-Long Phan
Physics , 2014, DOI: 10.1002/pssr.201409421
Abstract: We theoretically study the strain effect on the Casimir interactions in graphene based systems. We found that the interactions between two strained graphene sheets are strongly dependent on the direction of stretching. The influence of the strain on the dispersion interactions is still strong in the presence of dielectric substrates but is relatively weak when the substrate is metallic. Our studies would suggest new ways to design next generation devices.
van der Waals interactions between graphitic nanowiggles
Anh D. Phan,Lilia M. Woods,The-Long Phan
Physics , 2013, DOI: 10.1063/1.4816446
Abstract: The van der Waals interactions between two parallel graphitic nanowiggles (GNWs) are calculated using the coupled dipole method (CDM). The CDM is an efficient and accurate approach to determine such interactions explicitly by taking into account the discrete atomic structure. Our findings show that the van der Waals forces vary from attraction to repulsion as nanoribbons move along their lengths with respect to each other. This feature leads to a number of stable and unstable positions of the system during the movement process. These positions can be tuned by changing the length of GNW. Moreover, the influence of the thermal effect on the van der Waals interactions is also extensively investigated. This work would give good direction for both future theoretical and experimental studies.
Near-field heat transfer between gold nanoparticle arrays
Anh D. Phan,The-Long Phan,Lilia M. Woods
Physics , 2013, DOI: 10.1063/1.4838875
Abstract: The radiative heat transfer between gold nanoparticle layers is presented using the coupled dipole method. Gold nanoparticles are modelled as effective electric and magnetic dipoles interacting via electromagnetic fluctuations. The effect of higher-order multipoles is implemented in the expression of electric polarizability to calculate the interactions at short distances. Our findings show that the near-field radiation reduces as the radius of the nanoparticles is increased. Also, the magnetic dipole contribution to the heat exchange becomes more important for larger particles. When one layer is displayed in parallel with respect to the other layer, the near-field heat transfer exhibits oscillatory-like features due to the influence of the individual nanostructures. Further details about the effect of the nanoparticles size are also discussed.
Anomaly Detection of Store Cash Register Data Based on Improved LOF Algorithm  [PDF]
Ke Long, Yuhang Wu, Yufeng Gui
Applied Mathematics (AM) , 2018, DOI: 10.4236/am.2018.96049
As the cash register system gradually prevailed in shopping malls, detecting the abnormal status of the cash register system has gradually become a hotspot issue. This paper analyzes the transaction data of a shopping mall. When calculating the degree of data difference, the coefficient of variation is used as the attribute weight; the weighted Euclidean distance is used to calculate the degree of difference; and k-means clustering is used to classify different time periods. It applies the LOF algorithm to detect the outlier degree of transaction data at each time period, sets the initial threshold to detect outliers, deletes the outliers, and then performs SAX detection on the data set. If it does not pass the test, then it will gradually expand the outlying domain and repeat the above process to optimize the outlier threshold to improve the sensitivity of detection algorithm and reduce false positives.
The Expression of Soluble and Active Recombinant Haemophilus influenzae IgA1 Protease in E. coli
Shinong Long,Elaine Phan,Michel C. Vellard
Journal of Biomedicine and Biotechnology , 2010, DOI: 10.1155/2010/253983
Abstract: Immunoglobulin A1 (IgA1) proteases from Haemophilus influenzae are extracellular proteases that specifically cleave the hinge region of human IgA1, the predominant class of immunoglobulin present on mucosal membranes. The IgA1 proteases may have the potential to cleave IgA1 complexes in the kidney and be a therapeutic agent for IgA1 nephropathy (IgAN), a disease characterized by deposition of the IgA1 antibody in the glomerulus. We have screened for the expression of recombinant H. influenzae IgA1 protease by combining various expression plasmids, IgA1 protease constructs, and E. coli strains under multiple conditions. Using the method we have developed, approximately 20–40 mg/L of soluble and active H. influenzae IgA1 protease can be produced from E. coli strain C41(DE3), a significant increase in yield compared to the yield upon expression in H. influenzae or other related bacteria.
Repulsive interactions of a lipid membrane with graphene in composite materials
Anh D. Phan,Trinh X. Hoang,The-Long Phan,Lilia M. Woods
Physics , 2013, DOI: 10.1063/1.4828939
Abstract: The van der Waals interaction between a lipid membrane and a substrate covered by a graphene sheet is investigated using the Lifshitz theory. The reflection coefficients are obtained for a layered planar system submerged in water. The dielectric response properties of the involved materials are also specified and discussed. Our calculations show that a graphene covered substrate can repel the biological membrane in water. This is attributed to the significant changes in the response properties of the system due to the monolayer graphene. It is also found that the van der Waals interaction is mostly dominated by the presence of graphene, while the role of the particular substrate is secondary.
Study on Current Public Opinion in Vietnam Based on Universally Value System and Core Values Approach  [PDF]
Phan Tan
Open Journal of Social Sciences (JSS) , 2015, DOI: 10.4236/jss.2015.32015
Abstract: The history of Vietnam Country’s formation and defense through thousands of years has been summarized in the modern society’s objective value systems that are: independence, freedom, happiness, prosperous people and strong country, democracy, justice, and civilization. The value of democracy is regarded a core value and it has been realistic by applying the mechanism of the fact that the people know, people discuss, people do, and people supervise. The author looks forward to clarify this mechanism, and, above all, in a certain degree of clarification it matches with manner forming public opinion, the roles and functions of the public opinion.
Electric potential profile of a spherical soft particle with a charged core
Anh D. Phan,Dustin A. Tracy,T. L. Hoai Nguyen,N. A. Viet,The-Long Phan,Thanh H. Nguyen
Physics , 2013, DOI: 10.1063/1.4851196
Abstract: The electrostatic potential profile of a spherical soft particle is derived by solving the Poisson-Boltzmann equations on a spherical system both numerically and analytically. The soft particle is assumed to consist of an ion-permeable charged outer layer and a non-permeable charged core with constant charged density. The contribution of the core to the potential profile is calculated for different charges and dielectric constants. Our results show that the charged core heavily influences the local potential within the soft particle. In contrast, the potential distribution outside the particle in the salt solution is found to be weakly dependent on the core features. These findings are consistent with previous experiments showing the minor impact of the core of the MS2 virus on its overall electrical properties. Our studies also indicate that while a change in temperature from 290 K to 310 K only slightly varies the potential, the ionic strength in the range of 1-600 mM has a significant effect on the potential profile. Our studies would provide good understanding for experimental research in the field of biophysics and nanomedicine.
Electrochemical fabrication of sandwich nanostructures based on anodic alumina
Li, Zhao Jian;Huang, Ke Long;
Journal of the Brazilian Chemical Society , 2007, DOI: 10.1590/S0103-50532007000200024
Abstract: a sandwich porous anodic alumina (paa/al2o3/paa) film was successfully designed and fabricated using the customary two-step anodization approach on both sides of an aluminum foil. the structure of the film was determined with field emission scanning electron microscopy (sem). the sem shows the paa membranes has a well-defined nanostructure. all nanoholes stand symmetrically on both sides of the barrier layer. the average pore diameter reaches 40 nm.
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