Can every physical system simulate any Turing machine? This is a classical problem that is intimately connected with the undecidability of certain physical phenomena. Concerning fluid flows, Moore [C. Moore, 4, 199 (1991)] asked if hydrodynamics is capable of performing computations.
View Article and Find Full Text PDFGiven the importance of carbon allocation for plant performance and fitness, it is expected that competition and abiotic stress influence respiratory costs associated with stem wood biomass production and maintenance. In this study, stem respiration (R) was measured together with stem diameter increment in adult trees of eight co-occurring species in a sub-Mediterranean forest stand for 2 years. We estimated growth R (Rg), maintenance R (Rm) and the growth respiration coefficient (GRC) using two gas exchange methods: (i) estimating Rg as the product of growth and GRC (then Rm as R minus Rg) and (ii) estimating Rm from temperature-dependent kinetics of basal Rm at the dormant season (then Rg as R minus Rm).
View Article and Find Full Text PDFPhilos Trans A Math Phys Eng Sci
September 2018
The paper surveys open problems and questions related to different aspects of integrable systems with finitely many degrees of freedom. Many of the open problems were suggested by the participants of the conference 'Finite-dimensional Integrable Systems, FDIS 2017' held at CRM, Barcelona in July 2017.This article is part of the theme issue 'Finite dimensional integrable systems: new trends and methods'.
View Article and Find Full Text PDFPhilos Trans A Math Phys Eng Sci
September 2018
We prove a convexity theorem for the image of the moment map of a Hamiltonian torus action on a -symplectic manifold.This article is part of the theme issue 'Finite dimensional integrable systems: new trends and methods'.
View Article and Find Full Text PDFBackground: This study aimed to identify predictors of early (7-day) mortality in patients with septic acute kidney injury (AKI) who required continuous renal replacement therapy (CRRT).
Methods: Prospective cohort of 186 septic AKI patients undergoing CRRT at a tertiary hospital, from October 2005 to November 2010.
Results: After multivariate adjustment, five variables were associated to early mortality: norepinephrine utilization, liver failure, medical condition, lactate level, and pre-dialysis creatinine level.
The aim of the study was to assess the clinical utility of lactate measured at different time points to predict mortality at 48 hours and 28 days in septic patients with acute kidney injury (AKI) requiring continuous renal replacement therapy (CRRT).Consecutive critically ill patients with septic AKI requiring CRRT were prospectively studied. Variables were collected at initiation of CRRT and 24 hours later.
View Article and Find Full Text PDFObjective: To determine provider compliance with protocols for the prevention of postpartum hemorrhage and provider characteristics associated with adherence and non-adherence.
Methods: A multicenter descriptive study was conducted involving 78 direct observations of provider-implemented protocols and 52 interviews with Peruvian maternal healthcare providers at 4 Peruvian clinical sites representing the local, regional, and national levels of care. Parturient participants planning a normal vaginal delivery were 17-49 years of age and 34-42 weeks pregnant.
Ganciclovir (GCV) is the first therapeutic choice for prevention and treatment of active cytomegalovirus (CMV) infection in solid organ transplant recipients in Bahia state, Brazil. Prolonged and repeated GCV therapy may result in drug-resistant virus, associated with progressive and disseminated disease. We present a case report of a young male kidney recipient, who was CMV-seronegative with a CMV-seropositive donor (D(+)/R(-)), and who developed clinical GCV resistance, confirmed by mutation in viral UL97 phosphotransferase responsible for GCV activation.
View Article and Find Full Text PDFIn the year 2003, in the Faculty of Medicine of the Universidad Nacional Mayor de San Marcos, the Permanent Program of Training for the Integral Attention of the Victims of Violence was created, has been training human resources for the comprehensive health care to victims of violence. In this sense, we was considered necessary to develop a methodology for health professionals, identifying their training needs and the conditions under how they work. It is in this context, that the year 2004, a base line study was delineated in the Microrred de Salud Huaycán, in the east of Lima city; that included diverse stages with a multisectorial approach with the aim to identify the training needs of the health professionals, as well as the evaluation of the logistic and administrative support for the development of training activities to diverse levels.
View Article and Find Full Text PDFObjective: To compare men and women on chronic hemodialysis in relation to their scores in health-related quality of life (HRQOL) and evaluate the potential influence of age and comorbidities on the comparison.
Methods: Cross-section of the baseline data of 254 women and 349 men, participants of the PROHEMO Study that has been developed in dialysis units of Salvador. By using the version of the Kidney Disease Quality of Life Short Form KDQOL-SF, validated for the Brazilian population, the following scores were determined: physical component summary (PCS), mental component summary [MCS] and the scale for symptoms/problems related to renal disease.
Background And Objectives: Apolipoprotein D (Apo D) is a protein component of the human plasma lipid transport system, and an androgen-regulated protein in both breast and prostate cancer cell lines. Our goal was to evaluate the expression of Apo D in malignant cutaneous melanomas, as well as to assess its possible relationship to clinical and pathological parameters.
Methods: Apo D expression was analyzed in 32 paraffin-embedded tissues from patients with invasive cutaneous malignant melanomas, in 8 samples from in situ melanoma, and in 10 samples from 10 benign lesions (4 dermal melanocytic nevi, 4 compound melanocytic nevi, and 2 dysplastic melanocytic nevi), using immunohistochemical techniques.