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Santa Marta, Colombia

The University of Magdalena , is a public, departmental, coeducational, research university based in the city of Santa Marta, Magdalena, Colombia. Wikipedia.

Fuentes-Reines J.M.,University of Magdalena | de Roa E.Z.,Central University of Colombia
Check List | Year: 2013

Nine species of cladocerans are newly recorded from the Ciénaga Grande de Santa Marta Magdalena Department and of these, five of them are new to Colombia (Dunhevedia crassa, Simocephalus vetuloides, Ilyocriptus paranaensis paranaensis, Nicsmirnovius fitzpatricki and Coronatella monacantha). The known number of Cladocera (45 species) in Ciénaga Grande de Santa Marta represents about the half of reported species in Colombia. Brief descriptions and illustrations of species, including distribution, are given. © 2013 Check List and Authors.

Arango-Argoty G.A.,University of Magdalena
Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Conference | Year: 2011

Predict the function of unknown proteins is one of the principal goals in computational biology. The subcellular localization of a protein allows further understanding its structure and molecular function. Numerous prediction techniques have been developed, usually focusing on global information of the protein. But, predictions can be done through the identification of functional sub-sequence patterns known as motifs. For motifs discovery problem, many methods requires a predefined fixed window size in advance and aligned sequences. To confront these problems we proposed a method based on variable length motifs characterization and detection using the continuous wavelet transform (CWT) and a dissimilarity space representation. For analyzing the motifs results generated by our approach, we divide the entire dataset into training (60%) and validation (40%). A Support Vector Machine (SVM) classifier is used as predictor for validation set. The highest Sn = 82.58% and Sp = 92.86%, across 10-fold cross validation, is obtained for endosome proteins. Average results Sn = 74% and Sp = 75.58% are comparable to current state of the art. For data sets whose identity is low (< 40%), the motifs characterization and localization based on CWT shows a good performance and the interpretability of the subsequences in each subcellular localization.

Alvarez A.E.,University of Magdalena | Martin A.E.,Texas A&M University | Estakhri C.,Texas A&M University
Construction and Building Materials | Year: 2011

Permeable friction course (PFC) mixtures constitute one of the best options for surface paving, since they offer advantages (as compared to dense-graded hot mix asphalt) in terms of safety, economy, and environment. However, mix design and evaluation of PFC mixtures still require improvement and standardization to further promote the reliable use of these mixtures. This paper summarizes an extensive literature review focused on the basic aspects integrated in the mix design and evaluation of PFC mixtures. Although substantial advances related to these topics were reported since implementation of PFC mixtures in the 1990's, there is still a need for integration of several of these advances in an improved mix design procedure. The paper also identifies areas that require additional research, including the optimization of the balance between mixture functionality and durability and replacement of the indirect assessment of these important aspects. © 2010 Elsevier Ltd. All rights reserved.

Barba-Ortega J.,National University of Colombia | Gonzalez J.D.,University of Magdalena | Sardella E.,Sao Paulo State University
Journal of Low Temperature Physics | Year: 2014

We study the influence of a pentagonal (hexagonal) trench or barrier on the superconducting properties of a perforated disk. Effects associated to the pinning (anti-pinning) force of the central hole and the trench (barrier) and the interplay between the boundary conditions and the shape of the inner defects on the vortex configuration are studied for a thin disk. Also, we considered two cases for the value of the order parameter at the surface. The first one is ψs ≠0; this is the usual supercondutor/vacuum interface, for which the deGennes parameter is b→∞. The second one is ψs =0, which is the surface of the sample in a complete normal state, simulated by b=0. The vorticity, Gibbs free energy, magnetic induction, supercurrent density, magnetization and Cooper pairs density as a function of the external magnetic field are calculated. We show that in our sample new phenomena are possible due to the competing interactions of the boundary and the geometry of the sample and the added geometry of the nanoengineered trench and barrier. © 2013 Springer Science+Business Media New York.

Fuentes-Reines J.M.,University of Magdalena | Suarez-Morales E.,Colegio de Mexico
Crustaceana | Year: 2014

The harpacticoid copepod fauna of the Laguna Navío Quebrado, La Guajira, a protected area of the northern Colombian coast, was studied from plankton samples obtained at littoral areas covered by vegetation (macrophytes and mangroves), and at limnetic habitats close to an oyster bank. A total of 14 species of harpacticoid copepods are reported from the surveyed area. Nine of these species are new to the Colombian copepod fauna: Schizopera knabeni Lang, 1965, Cletocamptus helobius Fleeger, 1980, Quinquelaophonte quinquespinosa (Sewell, 1924), Sarsamphiascus hirtus (Gurney, 1927), Parategastes herteli Jacobi, 1953, Enhydrosoma lacunae Jakubisiak, 1933, Metis holothuriae (Edwards, 1891), Robertsonia propinqua (T. Scott, 1894) and Nitokra taylori Gómez, Carrasco & Morales-Serna, 2012. The first two species have not been hitherto recorded from South America and the last one is reported for the Americas for the first time. Nine of these species are also new records for the Caribbean Sea. This is the first report on the marine benthic harpacticoid Copepoda from northern Colombia. A complete species list plus brief diagnostic descriptions of the new records for the Colombian harpacticoid copepod fauna are provided together with morphologic remarks, notes on the variability of some species and their distribution. © Koninklijke Brill NV, Leiden, 2014.

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