Collective motion of energy depot active disks.

In the present work we have studied collectives of active disks with an energy depot, moving in the two-dimensional plane and interacting an excluded volume. The energy depot accounts for the extraction of energy taking place at the level of each particle in order to perform self-propulsion, included in an underdamped Langevin dynamics. We show that this model undergoes a flocking transition, exhibiting some of the key features of the Vicsek model, namely, band formation and giant number fluctuations.

Self-Organized States from Solutions of Active Ring Polymers in Bulk and under Confinement.

In the present work, we study, by means of numerical simulations, the structural and dynamical behavior of a suspension of active ring polymers in bulk and under lateral confinement. At high activity, when changing the distance between the confining planes and the polymers' density, we identify the emergence of a self-organized dynamical state, characterized by the coexistence of slowly diffusing clusters of rotating disks and faster rings moving in between them. We further assess that self-organization is robust in a range of polymer sizes, and we identify a critical value of the activity, necessary to trigger cluster formation.

Saturated constructed wetland-microbial fuel cell system and effect on dissolved oxygen gradient, electricity generation and ammonium removal.

The aim of this work was to assess effect of saturated constructed wetland-Microbial fuel cell system on dissolved oxygen gradient, electricity generation and ammonium removal. Two laboratory-scale systems, one planted with (SCW1-MFC) and other without plant (SCW2-MFC), were fed discontinuously with synthetic wastewater over 90 days. Both systems were operated at different organic loading rate (12 and 28 g COD/md) and ammonium loading rate (1.

Perioperative chemotherapy in locally advanced gastric cancer in Chile: from evidence to daily practice.

Gastric cancer (GC) is a leading cause of cancer death in Chile. Although recommended in international guidelines since 2006, perioperative chemotherapy was not available to patients in the public health system in Chile until 2016. We conducted an observational study to assess the feasibility of this strategy in public hospitals in Chile (Observational Study of Perioperative Chemotherapy in Locally Advanced Gastric Cancer - PRECISO).

[Helicobacter pylori infection detected during upper gastrointestinal endoscopy].

Background: Helicobacter pylori (HP) is the most widespread chronic human infection worldwide and the most important pathogenic factor of gastric cancer. The calculated prevalence at the Clinical Hospital of the University of Chile from 2002 to 2005 was 44.9%.

Survey of chronic pain in Chile - prevalence and treatment, impact on mood, daily activities and quality of life.

Background and aims The prevalence of chronic non-cancer pain has not been specifically reported in Chile. Methods In order to assess its prevalence and impact, we designed a tool based on previously published survey studies. We analyzed a sample of 784 subjects to determine the prevalence of chronic non-cancer pain, with a maximum variability of 50%, a confidence interval (CI) of 95%, and an estimation error of 3.

[Mortality of acute pancreatitis in a 20 years period].

Background: Mortality for acute pancreatitis (AP) in Chile has fluctuated between 7 ana 10% in last years.

Aim: To evaluate AP mortality over a period of 20 years in a clinical hospital in Santiago, Chile.

Material And Methods: Review of the database of hospital discharges with the diagnosis of acute pancreatitis, between 1990 and 2010 and the medical records of those patients.

[Bedside index for severity in acute pancreatitis (BISAP) score as predictor of clinical outcome in acute pancreatitis: retrospective review of 128 patients].

Background: Identification of patients at risk for severe disease early in the course of acute pancreatitis (AP) is essential to optimize management and to improve outcomes.

Aim: To assess BISAP score as a predictor of severity of AP.

Patients And Methods: Retrospective review of AP patients between January 2009 and December 2010.