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Search Results: 1 - 10 of 449837 matches for " Dyan J. C. Kwek "
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IL-1β, IL-6, and RANTES as Biomarkers of Chikungunya Severity
Lisa F. P. Ng, Angela Chow, Yong-Jiang Sun, Dyan J. C. Kwek, Poh-Lian Lim, Frederico Dimatatac, Lee-Ching Ng, Eng-Eong Ooi, Khar-Heng Choo, Zhisheng Her, Philippe Kourilsky, Yee-Sin Leo
PLOS ONE , 2009, DOI: 10.1371/journal.pone.0004261
Abstract: Background Little is known about the immunopathogenesis of Chikungunya virus. Circulating levels of immune mediators and growth factors were analyzed from patients infected during the first Singaporean Chikungunya fever outbreak in early 2008 to establish biomarkers associated with infection and/or disease severity. Methods and Findings Adult patients with laboratory-confirmed Chikungunya fever infection, who were referred to the Communicable Disease Centre/Tan Tock Seng Hospital during the period from January to February 2008, were included in this retrospective study. Plasma fractions were analyzed using a multiplex-microbead immunoassay. Among the patients, the most common clinical features were fever (100%), arthralgia (90%), rash (50%) and conjunctivitis (40%). Profiles of 30 cytokines, chemokines, and growth factors were able to discriminate the clinical forms of Chikungunya from healthy controls, with patients classified as non-severe and severe disease. Levels of 8 plasma cytokines and 4 growth factors were significantly elevated. Statistical analysis showed that an increase in IL-1β, IL-6 and a decrease in RANTES were associated with disease severity. Conclusions This is the first comprehensive report on the production of cytokines, chemokines, and growth factors during acute Chikungunya virus infection. Using these biomarkers, we were able to distinguish between mild disease and more severe forms of Chikungunya fever, thus enabling the identification of patients with poor prognosis and monitoring of the disease.
Going beyond GHZ paradox
Dagomir Kaszlikowski,Darwin Gosal,E. J. Ling,L. C. Kwek,Marek Zukowski,C. H. Oh
Physics , 2002,
Abstract: We present numerical data showing, that three qutrit correlations for a pure state, which is not maximally entangled, violate local realism more strongly than three-qubit correlations. The strength of violation is measured by the minimal amount of noise that must be admixed to the system so that the noisy correlations have a local and realistic model.
A Labelling Scheme for Higher Dimensional Simplex Equations
L. C. Kwek,C. H. Oh
Mathematics , 1995, DOI: 10.1088/0305-4470/28/21/002
Abstract: We present a succinct way of obtaining all possible higher dimensional generalization of Quantum Yang-Baxter Equation (QYBE). Using the scheme, we could generate the two popular three-simplex equations, namely: Zamolodchikov's tetrahedron equation (ZTE) and Frenkel and Moore equation (FME).
A General $q$-Oscillator Algebra
L. C. Kwek,C. H. Oh
Mathematics , 1998,
Abstract: It is well-known that the Macfarlane-Biedenharn $q$-oscillator and its generalization has no Hopf structure, whereas the Hong Yan $q$-oscillator can be endowed with a Hopf structure. In this letter, we demonstrate that it is possible to construct a general $q$-oscillator algebra which includes the Macfarlane-Biedenharn oscillator algebra and the Hong Yan oscillator algebra as special cases.
Some comments on $q$-deformed oscillators and $q$-deformed $su(2)$ algebras
L. C. Kwek,C. H. Oh
Mathematics , 1997, DOI: 10.1007/s100529800816
Abstract: The various relations between $q$-deformed oscillators algebras and the $q$-deformed $su(2)$ algebras are discussed. In particular, we exhibit the similarity of the $q$-deformed $su(2)$ algebra obtained from $q$-oscillators via Schwinger construction and those obtained from $q$-Holstein-Primakoff transformation and show how the relation between $su_{\sqrt{q}}(2)$ and Hong Yan $q$-oscillator can be regarded as an special case of In\"{o}u\"{e}- Wigner contraction. This latter observation and the imposition of positive norm requirement suggest that Hong-Yan $q$-oscillator algebra is different from the usual $su_{\sqrt{q}}(2)$ algebra, contrary to current belief in the literature.
Photonic Multiqubit States from a Single Atom
Ying Li,Leandro Aolita,L. C. Kwek
Physics , 2010, DOI: 10.1103/PhysRevA.83.032313
Abstract: We propose a protocol for the creation of photonic Greenberger-Horne-Zeilinger and linear cluster states emitted from a single atom---or ion---coupled to an optical cavity field. The method is based on laser pulses with different polarizations and exploits the atomic transition amplitudes to state-selectively achieve the desired transitions. The scheme lies within reach of current technology.
Superstrings, Gauge Fields and Black Holes
B. E. Baaquie,L. C. Kwek
Physics , 2000, DOI: 10.1142/S0217751X01004268
Abstract: There has been spectacular progress in the development of string and superstring theories since its inception thirty years ago. Development in this area has never been impeded by the lack of experimental confirmation. Indeed, numerous bold and imaginative strides have been taken and the sheer elegance and logical consistency of the arguments have served as a primary motivation for string theorists to push their formulations ahead. In fact the development in this area has been so rapid that new ideas quickly become obsolete. On the other hand, this rapid development has proved to be the greatest hindrance for novices interested in this area. These notes serve as a gentle introduction to this topic. In these elementary notes, we briefly review the RNS formulation of superstring theory, GSO projection, $D$-branes, bosonic strings, dualities, dynamics of $D$-branes and the microscopic description of Bekenstein entropy of a black hole.
Inventory of orchids in Mount Tinombala Natural Reserve, Tolitoli Regency, Central Sulawesi
Biodiversitas , 2006,
Abstract: The aims of the research were to inventory the flora of Sulawesi, especially orchids in the Mount Tinombala Natural Reserve and to collect the plant materials for planting as a collection plants in Bali Botanical Garden. The method used in this research was explorative method at the place with altitude more than 700 m above sea level. The result of the research was 50 collection number of orchids which was consist of 72 specimens, 19 families and 24 species found in the Mount Tinombala Natural Reserve, Tolitoli Regency, Central Sulawesi. Two numbers of them that unidentified yet called as a genus dubious. Dendrobium and Eria were the genus that dominant in the natural reserve and one species that predicted as a new collection for the Bali Botanic Garden was Macodes petola Lindl.
The effect of modified medium on the growth of Begonia imperialis and Begonia ‘Bethlehem Star’
Biodiversitas , 2006,
Abstract: The aim of the research was to know the effect of modified medium on the growth of Begonia imperialis and Begonia ‘Bethlehem Star’. The design of the research used was Experimental by Factorial Cluster Random Sampling, by using types of media (I=soil (control); II=soil:sand:compost; III=soil:sand:’kompenit’; IV=soil:sand:humus; V=soil:sand:manure) and the material (B. imperialis and B. ‘Bethlehem Star’). Sampling time (three replicated) was chosen in-groups. Observed parameters were plants tall, root, the numbers of shoots and the environmental factors (temperature and humidity). Analysist of variant showed that ‘kompenit’ is the best medium to support on the propagation of B. imperialis and B. ‘Bethlehem Star’.
Quantum nonlocality of four-qubit entangled states
Chunfeng Wu,Ye Yeo,L. C. Kwek,C. H. Oh
Physics , 2006, DOI: 10.1103/PhysRevA.75.032332
Abstract: Quantum nonlocality of several four-qubit states is investigated by constructing a new Bell inequality. These include the Greenberger-Zeilinger-Horne (GHZ) state, W state, cluster state, and the state $|\chi>$ that has been recently proposed in [PRL, {\bf 96}, 060502 (2006)]. The Bell inequality is optimally violated by $|\chi>$ but not violated by the GHZ state. The cluster state also violates the Bell inequality though not optimally. The state $|\chi>$ can thus be discriminated from the cluster state by using the inequality. Different aspects of four-partite entanglement are also studied by considering the usefulness of a family of four-qubit mixed states as resources for two-qubit teleportation. Our results generalize those in [PRL, {\bf 72}, 797 (1994)].
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