El Estado nutricional de la población prehistórica de Gran Canaria: estudio de las líneas de Harris

Se analizó la prevalencia de Líneas de Harris en 194 tibias derechas de la población prehispánica de Gran Canaria, correspondiendo todas ellas a individuos adultos: 52 mujeres y 123 hombres. No se detectaron Líneas de Harris en 45 (23%) de los individuos, 13 mujeres (25%) y 26 hombres (21%), diferencias éstas que no muestran ninguna significación estadísitca. Las tibias femeninas muestran un número ligeramente menor de Líneas de Harris en su extremo distal que las correspondientes a los hombres (1.692+-1.681 en las mujeres vs 1.91 +-1.825 en los hombres). Las edades de formación de las Líneas de Harris muestran dos picos, uno mayor a la edad de un año, y otra entre los 15 y 16 años en los hombres y entre los 11-12 y los 14-15 para las mujeres. Las líneas de Harris se observaron con una mayor frecuencia en el distal que en el proximal del hueso. El relativamente bajo número de líneas detectadas en la población sometida a estudio cuando se compara con la elevada prevalencia de osteoporosis en la población adulta de esta isla, se muestra como un dato de gran interés.Harris lines were assesed in 194 right tibiae of prehispanic inhabitants of Gran Canaria, belonging to 52 adult females and 123 adult males. No Harris lines were detected in 45 (23%) of the adult individuals, 13 females (25%) and 26 males (21%), these differences being not statistically significant. Female tibiae showed a slightly lower mean number of Harris lines at the distal end than males ones (1.692+-1.681 in females vs 1,91+-1.825 in males). Ages at wich Harris lines were formed showed two peaks, a major one at the age of 1 year, and another between 15 and 16 years in males and between 11-12 and 14- 15 years in females. Harris lines were more frequently at the distal than at the proximal end of the bone . The relative low number of lines detected in our population when compared with the high prevalence of osteoporosis among the adult population of this island is striking

Marked eburnation among prehispanic individuals from La Gomera (Canary Islands)

Marked eburnation among prehispanic individuals from La Gomera (Canary Islands) Eburnation of the articular surfaces is an advanced feature of osteoarthritis. We here report some striking cases of such a condition in the proximal epiphysis of tibiae of prehispanic inhabitants of La Gomera, in the Canary Archipelago

Constraints on the χ_(c1) versus χ_(c2) polarizations in proton-proton collisions at √s = 8 TeV

The polarizations of promptly produced χ_(c1) and χ_(c2) mesons are studied using data collected by the CMS experiment at the LHC, in proton-proton collisions at √s=8  TeV. The χ_c states are reconstructed via their radiative decays χ_c → J/ψγ, with the photons being measured through conversions to e⁺e⁻, which allows the two states to be well resolved. The polarizations are measured in the helicity frame, through the analysis of the χ_(c2) to χ_(c1) yield ratio as a function of the polar or azimuthal angle of the positive muon emitted in the J/ψ → μ⁺μ⁻ decay, in three bins of J/ψ transverse momentum. While no differences are seen between the two states in terms of azimuthal decay angle distributions, they are observed to have significantly different polar anisotropies. The measurement favors a scenario where at least one of the two states is strongly polarized along the helicity quantization axis, in agreement with nonrelativistic quantum chromodynamics predictions. This is the first measurement of significantly polarized quarkonia produced at high transverse momentum

Quantum instability of magnetized stellar objects

The equations of state for degenerate electron and neutron gases are studied in the presence of magnetic fields. After including quantum effects to study the structural properties of these systems, it is found that some hypermagnetized stars can be unstable based on the criterium of stability of pressures. Highly magnetized white dwarfs should collapse producing a supernova type Ia, whilst superstrongly magnetized neutron stars cannot stand their own magnetic field and must implode, too. A comparison of our results with a set of the available observational data of some compact stars is also presented, and the agreement between this theory and observations is verified.Comment: 14 pages, 2 figures, uses ChJAA LaTeX macro; final version to appear in ChJA