Elemental mercury (Hg(o)) for gold amalgamation is the main process applied by artisanal gold miners in South America, leading to important discharges into freshwater ecosystems. Through a 28-day experimental approach based on indoor microcosms, we simulated the chemical fate and bioavailability of Hg(o) droplets in the presence or absence of sediment collected from a typical forest creek that ...

The high availability and safety requirements for automotive electronics are currently almost exclusively addressed by application-specific engineering solutions to fault tolerance rather than by systematic approaches. Currently, syst e m i c approaches are ruled out because of cost. The reason for this is that a systemic approach to fault tolerance requires ( I ) replication of components and ...

With an increase in the availability of implant restorative components, the selection of an appropriate implant abutment for a given clinical situation has become more challenging. This article describes a classification system that will help the practitioner understand the different implant abutments available and therefore be able to understand the selection of abutments for single and multip...

Background: The peptic perforation is one of the commonest abdominal surgical emergencies. Common causes are H.pylori, increased inadvertent use of NSAIDS, smoking and stress of modern life. During last few years there has been great revolution in availability of the newer broad spectrum antibiotics, better understanding of disease, effective resuscitation, prompt surgery under modern anaesthes...

We describe a multi-faceted effort to demonstrate the practical implementation of stochastic unit commitment at RTO scale. The inputs for the scheduling engine consist of multiple hourly trajectories of load and variable generation availability together with probabilities that accurately describe their likelihood of occurrence given information available on the day ahead. Preliminary computatio...

conclusions considering the personal and background characteristics of personnel and understanding their association with stress and stressful situations encompasses the ability to persevere and adapt to contextual stressors. patients and methods in this cross-sectional study, 3643 anonymous questionnaires were disseminated among nurses in different hospitals in tehran, iran, by utilizing multi...

medication errors account for about 78% of serious medical errors in intensive care unit (icu). so far no study has been performed in iran to evaluate all type of possible medication errors in icu. therefore the objective of this study was to reveal the frequency, type and consequences of all type of errors in an icu of a large teaching hospital. the prospective observational study was conducte...

During high-intensity submaximal exercise, muscle fatigue and decreased efficiency are intertwined closely, and each contributes to exercise intolerance. Fatigue and muscle inefficiency share common mechanisms, for example, decreased "metabolic stability," muscle metabolite accumulation, decreased free energy of adenosine triphosphate breakdown, limited O2 or substrate availability, increased g...

The diversity of reproductive strategies in nature is shaped by a plethora of factors including energy availability. For example, both low temperatures and limited food availability could increase larval exposure to predation by slowing development, selecting against pelagic and/or feeding larvae. The frequency of hermaphroditism could increase under low food availability as population density ...