5 research outputs found

    Clustering Algorithms: Their Application to Gene Expression Data

    Get PDF
    Gene expression data hide vital information required to understand the biological process that takes place in a particular organism in relation to its environment. Deciphering the hidden patterns in gene expression data proffers a prodigious preference to strengthen the understanding of functional genomics. The complexity of biological networks and the volume of genes present increase the challenges of comprehending and interpretation of the resulting mass of data, which consists of millions of measurements; these data also inhibit vagueness, imprecision, and noise. Therefore, the use of clustering techniques is a first step toward addressing these challenges, which is essential in the data mining process to reveal natural structures and iden-tify interesting patterns in the underlying data. The clustering of gene expression data has been proven to be useful in making known the natural structure inherent in gene expression data, understanding gene functions, cellular processes, and subtypes of cells, mining useful information from noisy data, and understanding gene regulation. The other benefit of clustering gene expression data is the identification of homology, which is very important in vaccine design. This review examines the various clustering algorithms applicable to the gene expression data in order to discover and provide useful knowledge of the appropriate clustering technique that will guarantee stability and high degree of accuracy in its analysis procedure

    Raman And Infrared Spectroscopy Of Sr2b′uo6 (b′ = Ni; Co) Double Perovskites

    No full text
    Temperature dependent normal modes and lattice thermal expansion of Sr 2B′UO6 (B′ = Ni, Co) double perovskites were investigated by Raman/infrared spectroscopies and synchrotron X-ray diffraction, respectively. Monoclinic crystal structures with space group P21/n were confirmed for both compounds, with no clear structural phase transition between 10 and 400 K. As predicted for this structure, the first-order Raman and infrared spectra show a plethora of active modes. In addition, the Raman spectra reveal an enhancement of the integrated area of an oxygen stretching mode, which is also observed in higher-order Raman modes, and an anomalous softening of ∼1 cm-1 upon cooling below T* ∼ 300 K. In contrast, the infrared spectra show conventional temperature dependence. The band profile phonon anomalies are possibly related to an unspecified electronic property of Sr2B′UO6 (B′ = Ni, Co). © 2010 Elsevier B.V. All rights reserved.542142147Serrate, D., Serrate, D., De Teresa, J.M., Ibarra, M.R., (2007) J. Phys.: Condens. Matter, 19, p. 023201Kobayashi, K.-I., Kimura, T., Sawada, H., Terakura, K., Tokura, Y., (1998) Nature (London), 395, p. 677Kobayashi, K.I., Kimura, T., Tomioka, Y., Sawada, H., Terakura, K., (1999) Phys. Rev. B, 59, p. 11159Prellier, W., Smolyaninova, V., Biswas, A., Galley, C., Greene, R.L., Ramesha, K., Gopalakrishnan, J., (2000) J. Phys. C, 12, p. 965Gopalakrishnan, J., Chattopadhyay, A., Ogale, S.B., Venkatesan, T., Greene, R.L., Millis, A.J., Ramesha, K., Marest, G., (2000) Phys. Rev. B, 62, p. 9538Maignan, A., Raveau, B., Martin, C., Hervieu, M., (1999) J. Solid State Chem., 144, p. 224Dai, J.M., Song, W.H., Wang, S.G., Ye, S.L., Wang, K.Y., Du, J.J., Sun, Y.P., Gao, B.J., (2001) Mat. Sci. Eng. B, 83, p. 217Granado, E., Hung, Q., Lynn, J.W., Gopalakrishnan, J., Greene, R.L., Ramesha, K., (2002) Phys. Rev. B, 66, p. 064409Azimonte, C., Cezar, J.C., Granado, E., Huang, Q., Lynn, J.W., Campoy, J.C.P., Gopalakrishnan, J., Ramesha, K., (2007) Phys. Rev. Lett., 98, p. 017204Azimonte, C., Granado, E., Cezar, J.C., Gopalakrishnan, J., Ramesha, K., (2007) J. Appl. Phys., 101, pp. 09H115Serrate, D., De Teresa, J.M., Algarabel, P.A., Galibert, J., Ritter, C., Blasco, J., Ibarra, M.R., (2007) Phys. Rev. B, 75, p. 165109Sikora, M., Mathon, O., Van Der Linden, P., Michalik, J.M., De Teresa, J.M., Kapusta, C., Pascarelli, S., (2009) Phys. Rev. B, 79, p. 220402Pinacca, R.M., Viola, M.C., Pedregosa, J.C., Muñoz, A., Alonso, J.A., Martínez-Lope, M.J., Carbonio, R.E., (2005) Dalton Trans., p. 447Pinacca, R.M., Viola, M.C., Pedregosa, J.C., Martínez-Lope, M.J., Carbonio, R.E., Alonso, J.A., (2007) J. Solid State Chem., 180, p. 1582Ferreira, F.F., Granado, E., Carvalho Jr., W., Kycia, S.W., Bruno, D., Droppa Jr., R., (2006) J. Synchrotron Rad., 13, p. 46Larson, A.C., Von Dreele, R.B., (2000) Los Alamos National Laboratory Report LAUR 86-748Toby, B.H., (2001) J. Appl. Cryst., 34, pp. 210-213Prosandeev, S.A., Waghmare, U., Levin, I., Maslar, J., (2005) Phys. Rev. B, 71, p. 214307Iliev, M.N., Abrashev, M.V., Litvinchuk, A.P., Hadjiev, V.G., Guo, H., Gupta, A., (2007) Phys. Rev. B, 75, p. 104118Balkanski, M., Wallis, R.F., Haro, E., (1983) Phys. Rev. B, 28, p. 1928Andreasson, J., Holmlund, J., Knee, C.S., Käll, M., Börjesson, L., Naler, S., Bäckström, J., Eriksson, S.-G., (2007) Phys. Rev. B, 75, p. 104302Fujioka, Y., Frantti, J., Kakihana, M., (2004) J. Phys. Chem. B, 108, p. 17012Fujioka, Y., Frantti, J., Kakihana, M., (2006) J. Phys. Chem. B, 110, p. 777Kurosawa, T., (1961) J. Phys. Soc. Jpn., 16, p. 1208Siny, I.G., Katiyar, R.S., Bhalla, A.S., (2000) Ferroelectr. Rev., 2, p. 51Granado, E., García, A., Sanjurjo, J.A., Rettori, C., Torriani, I., Prado, F., Sánchez, R.D., Oseroff, S.B., (1999) Phys. Rev. B, 60, p. 11879Iliev, M.N., Guo, H., Gupta, A., (2007) Appl. Phys. Lett., 90, p. 15191
    corecore