Detection of Escherichia coli in potable water using indirect impedance technology

Preparation and bactericidal effect of composites based on crosslinked copolymers containing silver nanoparticles

“…The NH 4 OH presence had an important role on the formation of smaller silver particles due to a possible silver complex formation during the reduction reaction. The bactericide effect is related to the interaction between silver and E. coli.…”

“…It can be explained by a possibly stronger reaction control through the formation of an [Ag(NH 3 ) 2 ] + complex by the NH 4 OH while the NaOH solution favors the formation of silver clusters in the polymer surface [16] . The Figure 2 shows two possible nanosilver formations.…”

“…The resin was added to one of these solutions and in the other 3 g of hydroxylamine chloride was added. The pH was controlled by adding drops of a 2 mol.L -1 solution of NaOH or NH 4 OH to keep the pH at approximately 12. The hydroxylamine chloride solution was added to the resin solution during 20 minutes.…”

“…Typical untreated domestic wastewater usually contains from 10 6 to 10 9 total coliforms per 100 mL, according to the wastewater pollution level [3] . This bacterium has been detected in food and drinking water [4] . To avoid levels harmful to human health and well-being, efficient water purification is necessary.…”

Geometric parameters optimization of planar interdigitated electrodes for bioimpedance spectroscopy

“…Another potential benefit is the ability to integrate electrodes with instrumentation to develop autonomous, lab-on-chip measurement systems. Typically they have been used for the detection of capacitance, dielectric constant, and bulk conductivity in biological mediums [8][9]. We have been motivated to consider this type of geometry for biomedical applications generally and, more particularly, to measure the dielectric properties (such as conductivity and permittivity) of human blood from a droplet.…”