Oferta de servicios de salud y accesibilidad geográfica.

Olivet M, Aloy J, Prat E, Pons X (2008) Oferta de servicios de salud y accesibilidad geográfica. Medicina Clínica 13: 16-22.

Health services provision and geographic accessibility [Oferta de servicios de salud y accesibilidad geográfica]

Olivet M., Aloy J., Prat E., Pons X. (2008) Health services provision and geographic accessibility [Oferta de servicios de salud y accesibilidad geográfica]. Medicina Clinica. 131: 16-22.
Enllaç
Doi: 10.1016/S0025-7753(08)76470-4

Resum:

This study describes the health services available in Catalonia, Spain as part of the situation analysis of the healthcare map, setting a starting point for the process of adapting services to the needs of the population. It also includes an analysis of the geographic accessibility to healthcare centres in the public health system, through the use of a geographic information system (GIS), with geo-referencing variables and calculations of travel times and distances. The principal results show,on one hand, the adaptation of the Catalan healthcare network to the distribution of the population, with a high level of geographic proximity of the services to the population, and a high degree of capillarity, principally in primary healthcare; and on the other hand, the importance that GIS tools and procedures may acquire in healthcareplanning is highlighted. © 2008 Elsevier España S.L.

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Xylem hydraulic properties of roots and stems of nine Mediterranean woody species

Martínez-Vilalta J., Prat E., Oliveras I., Piñol J. (2002) Xylem hydraulic properties of roots and stems of nine Mediterranean woody species. Oecologia. 133: 19-29.
Enllaç
Doi: 10.1007/s00442-002-1009-2

Resum:

We studied the hydraulic architecture and water relations of nine co-occurring woody species in a Spanish evergreen oak forest over the course of a dry season. Our main objectives were to: (1) test the existence of a trade-off between hydraulic conductivity and security in the xylem, and (2) establish the safety margins at which the species operated in relation to hydraulic failure, and compare these safety margins between species and tissues (roots vs. stems). Our results showed that the relationship between specific hydraulic conductivity (Ks) and resistance to cavitation followed a power function with exponent ≈-2, consistent with the existence of a trade-off between conductivity and security in the xylem, and also consistent with a linear relationship between vessel diameter and the size of inter-vessel pores. The diameter of xylem conduits, Ks and vulnerability to xylem embolism were always higher in roots than in stems of the same species. Safety margins from hydraulic failure were narrower in roots than in stems. Among species, the water potential (Ψ) at which 50% of conductivity was lost due to embolism ranged between -0.9 and <-8 MPa for roots and between -2.0 and <-8 MPa for stems. Vulnerability to xylem embolism followed a pattern of: Quercus ilex=Acer monspessulanum=Arbutus unedo=Sorbus torminalis=Cistus laurifolius>Cistus albidus=Ilex aquifolium>Phillyrea latifolia>Juniperus oxycedrus. Gas exchange and seasonal Ψ minima were in general correlated with resistance to xylem embolism. Hydraulic safety margins differed markedly among species, with some of them (J. oxycedrus, I. aquifolium, P. latifolia) showing a xylem overly resistant to cavitation. We hypothesize that this overly resistant xylem may be related to the shape of the relationship between Ks and security we have found.

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