Procedure for emergetic assessment in urban river de-pollution.

Using emergetic indicators to evaluate complex processes such as the de-pollution of urban rivers aims to contribute to better use and preservation of the resources, besides the valuation of ecosystem services provided by the water body. Within this context, we conducted a bibliometric and systematic review that shows the lack of emergetic indicators in urban river de-pollution. Thus, this work aims to propose an emergetic assessment procedure to evaluate the de-pollution process of urban rivers that allows technicians, academics, and revitalization process managers of urban rivers to improve the monitoring and decision-making directly related to the process, concluding that an emergetic assessment procedure contributes to theory to create new scientific analyses applied to urban revitalization and nature preservation processes.

Wearable Devices to Diagnose and Monitor the Progression of COVID-19 Through Heart Rate Variability Measurement: Systematic Review and Meta-Analysis.

Background: Recent studies have linked low heart rate variability (HRV) with COVID-19, indicating that this parameter can be a marker of the onset of the disease and its severity and a predictor of mortality in infected people. Given the large number of wearable devices that capture physiological signals of the human body easily and noninvasively, several studies have used this equipment to measure the HRV of individuals and related these measures to COVID-19.

Objective: The objective of this study was to assess the utility of HRV measurements obtained from wearable devices as predictive indicators of COVID-19, as well as the onset and worsening of symptoms in affected individuals.

Relationship between analysis of laser speckle image and Knoop hardness on softening enamel.

Background: In this study is presented the correlation between laser speckle images and enamel hardness loss.

Methods: In order to shift the enamel hardness, a dental demineralization model was applied to 32 samples of vestibular bovine teeth. After they were cleaned, cut and polished, the samples were divided into 4 groups and immersed in 30ml of a cola-based soft drink for 10, 20, 30 and 40min twice a day for 7 consecutive days with half the surface protected by two layers of nail polish.