Miro M.,University of the Balearic Islands
TrAC - Trends in Analytical Chemistry | Year: 2014
On-chip integration of sample-processing procedures other than electrophoretic-based approaches is still deemed challenging in the microfluidic arena. This review outlines progress towards accommodating sorptive microextraction methods that exploit advanced flow methodology. Based upon software-controlled, pressure-driven programmable flow, mesofluidic lab-on-valve platforms have proved suitable for on-chip microsolid-phase extraction methods using renewable sorptive entities. However, a number of stringent requirements were reported in the literature for repeatable handling of sorptive particles in mesofluidic platforms. Demonstrated with examples in the environmental and bioanalytical fields, this article gives tips for reliable in-line manipulation of sorbent materials in a disposable format, regardless of the dimensions, the morphology and the density of beads, and for amelioration of column efficiency in separating and/or preconcentrating target species in troublesome samples. © 2014 Elsevier B.V.
Bibiloni M.M.,University of the Balearic Islands
BMC public health | Year: 2012
Many different factors influenced food habits and physical activity patterns of adolescents in a complex interactive way. The aim of this study was to assess association between sedentary behaviour and socioeconomic factors, diet and lifestyle among the Balearic Islands adolescents. A cross-sectional survey (n = 1961; 12-17 years old) was carried out. Physical activity was assessed using the International Physical Activity Questionnaire for adolescents (IPAQ-A). Sedentary behaviour was defined as <300 min/week of moderate and vigorous physical activity. Anthropometric measurements, body image, socio-economic and lifestyle determinants, food consumption, and adherence to the Mediterranean diet were assessed. The prevalence of sedentary behaviour was 37.1% (22.0% boys, 50.8% girls). Active boys consumed frequently breakfast cereals and fresh fruit; active girls yogurt, cheese, breakfast cereals, and fresh fruit; and sedentary girls high fat foods and soft drinks. Sedentary behaviour of girls was directly associated to age, and time spent on media screen and homework, and inversely related to adherence to Mediterranean diet, and body composition. Sedentary behaviour of boys was inversely related to adherence to the Mediterranean diet, and the desire to remain the same weight. The prevalence of sedentary behaviour among Balearic Islands adolescents is high, mainly among girls. Age, sex, parental educational and profession levels, body size dissatisfaction, and poor quality diet are important factors of physical activity practice among adolescents.
Giorgi G.L.,University of the Balearic Islands
Physical Review A - Atomic, Molecular, and Optical Physics | Year: 2011
In contrast with entanglement, as measured by concurrence, in general, quantum discord does not possess the property of monogamy; that is, there is no tradeoff between the quantum discord shared by a pair of subsystems and the quantum discord that both of them can share with a third party. Here, we show that, as far as monogamy is considered, quantum discord of pure states is equivalent to the entanglement of formation. This result allows one to analytically prove that none of the pure three-qubit states belonging to the subclass of W states is monogamous. A suitable physical interpretation of the meaning of the correlation information as a quantifier of monogamy for the total information is also given. Finally, we prove that, for rank 2 two-qubit states, discord and classical correlations are bounded from above by single-qubit von Neumann entropies. © 2011 American Physical Society.
Frontera A.,University of the Balearic Islands
Coordination Chemistry Reviews | Year: 2013
Supramolecular chemistry of anions is a topic of continuous interest due to vital role of anions in many key chemical and biological processes. The dominant functional groups for constructing anion binding receptors are amides and amines/ammonium cations, where the key interaction to bind the anion is the hydrogen bond. This review covers systems where the binding of the anion with the receptor is through anion-π interactions, i.e., the non-covalent forces between electron-deficient aromatic systems and anions. Moreover, this review is focused to those receptors where coordination metals play a prominent role thanks to two very important characteristics: first, they are crucial for the synthesis and assembly of the receptor and, secondly, they strongly change the π-binding ability of the aromatic ligands, increasing significantly their π-acidity and, consequently, enhancing the ability of the ring to interact favorably with anions. © 2013 Elsevier B.V.
Bauza-Ribot M.M.,University of the Balearic Islands
BMC evolutionary biology | Year: 2011
Metacrangonyctidae (Amphipoda, Crustacea) is an enigmatic continental subterranean water family of marine origin (thalassoid). One of the species in the genus, Metacrangonyx longipes, is endemic to the Balearic islands of Mallorca and Menorca (W Mediterranean). It has been suggested that the origin and distribution of thalassoid crustaceans could be explained by one of two alternative hypotheses: (1) active colonization of inland freshwater aquifers by a marine ancestor, followed by an adaptative shift; or (2) passive colonization by stranding of ancestral marine populations in coastal aquifers during marine regressions. A comparison of phylogenies, phylogeographic patterns and age estimations of clades should discriminate in favour of one of these two proposals. Phylogenetic relationships within M. longipes based on three mitochondrial DNA (mtDNA) and one nuclear marker revealed five genetically divergent and geographically structured clades. Analyses of cytochrome oxidase subunit 1 (cox1) mtDNA data showed the occurrence of a high geographic population subdivision in both islands, with current gene flow occurring exclusively between sites located in close proximity. Molecular-clock estimations dated the origin of M. longipes previous to about 6 Ma, whereas major cladogenetic events within the species took place between 4.2 and 2.0 Ma. M. longipes displayed a surprisingly old and highly fragmented population structure, with major episodes of cladogenesis within the species roughly correlating with some of the major marine transgression-regression episodes that affected the region during the last 6 Ma. Eustatic changes (vicariant events) -not active range expansion of marine littoral ancestors colonizing desalinated habitats-explain the phylogeographic pattern observed in M. longipes.