Modified Gravity on the Brane and Dark Energy

We analyze the dynamics of an AdS5 braneworld with matter fields when gravity is allowed to deviate from the Einstein form on the brane. We consider exact 5-dimensional warped solutions which are associated with conformal bulk fields of weight -4 and describe on the brane the following three dynamics: those of inhomogeneous dust, of generalized dark radiation, and of homogeneous polytropic dark energy. We show that, with modified gravity on the brane, the existence of such dynamical geometries requires the presence of non-conformal matter fields confined to the brane.Comment: Revised version published in Gen. Rel. Grav. Typos corrected, updated reference and some remarks added for clarity. 11 pages, latex, no figure

Hemodialysis vascular access coordinator: Three‐level model for access management

Management of vascular access is a challenge for the dialysis team, particularly tokeep the arteriovenous access working. The vascular access coordinator can posi-tively contribute to increase the number of arteriovenous fistulas and reduce centralvenous catheters. In this article, we introduce a new approach to vascular accessmanagement centered on (the results of setting up) the role of vascular access coor-dinator. We described the three-level model (3Level_M) for vascular access manage-ment organized in three levels: vascular access nurse manager, vascular accesscoordinator, and vascular access consultant. We defined the instrumental skills andtraining required to be developed by each element and clarify the articulationbetween the model and all members of the dialysis team related to vascular access.1|INTRODUCTIONThe implementation and effectiveness of renal replacement therapy(RRT) depend directly on appropriate vascular access, such as arterio-venous fistula (AVF) (best choice), or alternatively a graft or a centralvenous catheter (CVC).1Nowadays, chronic kidney disease (CKD) patients are older, sufferfrom a larger number of comorbidities, and have more complex vascu-lar accesses. Therefore, the dialysis team and patients face new chal-lenges. The complications of the arteriovenous accesses are alreadydocumented and require supervision (monitoring and surveillance) inorder to decide the appropriate time to intervene.1,2Literature shows that the vascular access coordinator canhave an important contribution in the identification ofthese situations and in the implementation of a new approachleading to the best results in clinical care.3–8The vascularaccess coordinator's role can be crucial to improve the planning oftimely interventions free of thrombosis,7,6improve vascular accessoutcomes,3,7decrease the number of grafts and CVCs,5and applya quality policy with the vascular access.6The purpose of thisarticle is to analyze the vascular access coordinator's contribution(to) in the vascular access outcomes and introduce a newapproach on vascular access management, the three-level model(3Level_M).Received: 12 February 2023 Revised: 22 March 2023 Accepted: 26 March 2023DOI: 10.1111/sdi.13153Semin Dial.2023;1–6.wileyonlinelibrary.com/journal/sdi© 2023 Wiley Periodicals LLC.1info:eu-repo/semantics/publishedVersio

How to choose the appropriate cannulation technique for vascular access in hemodialysis patients

The cannulation technique is important for the survival of the arteriovenous access. Choosing the appropriate technique is a complex decision. Such choice must be customized to patients, considering their characteristics, the type of arteriovenous access and the experience of the hemodialysis team. We describe seven items that can help nurses to identify the appropriate cannulation technique: type of arteriovenous access; drainage vein; hygienic self-care profile; experience of the nursing staff in the cannulation technique and nurse-to-patient ratio; hemodialysis treatment method; patient's condition; and patient's decision. Such items can help nurses in decision-making on the "ideal" cannulation technique for each patient.info:eu-repo/semantics/publishedVersio

Characterisation of microbial attack on archaeological bone

As part of an EU funded project to investigate the factors influencing bone preservation in the archaeological record, more than 250 bones from 41 archaeological sites in five countries spanning four climatic regions were studied for diagenetic alteration. Sites were selected to cover a range of environmental conditions and archaeological contexts. Microscopic and physical (mercury intrusion porosimetry) analyses of these bones revealed that the majority (68%) had suffered microbial attack. Furthermore, significant differences were found between animal and human bone in both the state of preservation and the type of microbial attack present. These differences in preservation might result from differences in early taphonomy of the bones. © 2003 Elsevier Science Ltd. All rights reserved