Human Health: Medical Scientific Principles to Increase IT

To solve the present health scientific problems, requires a synthesis of the theoretical results of the analytic and reductive research made by the laboratory, clinical and public health, medical sciences. The reach of the potential maturity and efficiency of a unified medical science demands the integration by induction of those theories and a better understanding of their meanings. Thus, essential principles could be obtained within a general theory, to guide deductively a part of the present factual reseach to increase more the human health. This research should be placed within an integral framework of advanced ideas and models of the life and health of the human being in his environment. It must be made through the coordinating precepts of the clinical sciences. Much information from publications and meetings interchangeable by Internet, should be handled with a new integrative and interpretative, theoretical approach. International cross-disciplinary teams and a program with a theory-based network are necessary

Magnetism and magnetic structures of PrMn2Ge2-xSix

The structural and magnetic properties of seven PrMn2Ge2-xSix compounds with Si concentrations in the range x = 0.0-2.0 have been investigated by x-ray diffraction, magnetic (5-350 K), differential scanning calorimetry (300-500 K) and neutron diffraction (3-480 K) measurements. Replacement of Ge by Si leads to a contraction of the unit cell and significant modifications to the magnetic states-a crossover from ferromagnetism at room temperature for Ge-rich compounds to antiferromagnetism for Si-rich compounds. The compositional dependence of the room temperature lattice parameters exhibits non-linear behaviour around x = 1.2, reflecting the presence of magnetovolume effects. Re-entrant ferromagnetism has been observed in both PrMn2Ge1.0Si1.0 and PrMn2Ge0.8Si1.2 compounds with co-existence of canted ferromagnetism and canted antiferromagnetism detected, with both compounds exhibiting a larger unit cell volume in the canted Fmc state than in the canted AFmc. Combined with earlier studies of this system, the magnetic phase diagram has been constructed over the full range of PrMn2Ge2-xSix compositions (x = 0.0-2.0) and over the temperature range of interest (T = 3-480 K). In common with other systems in the RMn2X2 series, the overall magnetic behaviour of PrMn2Ge2-xSix compounds is governed by the strong dependence of the magnetic couplings on the Mn-Mn spacing within the ab-plane. Both total manganese moment mu(Mn)(tot) and in-plane manganese moment mu(Mn)(ab) at 5 K are found to decrease with increasing Si content, which can be ascribed to the reduction of Mn-Mn separation distance and stronger Si-Mn hybridization compared with Ge-Mn hybridization. Pr site ferromagnetic ordering occurs for x < 1.6 below T-C(Pr). © 2013, IOP Publishing LTD