NanoDays in Mayagüez Mall

NSF-sponsored outreach activity “Nanodays” was carried out on April 14th, 2012 in Mayagüez Mall at Mayagüez, Puerto Rico. The main objective of this event was to show to the local community, especially K-12 students, some important features of nanotechnology. Several research groups from the University of Puerto Rico at Mayagüez of different backgrounds presented simple and…

Workshop: Viscous Flows & Brownian Motion

Last Saturday, we participated in a workshop for local science and math teachers sponsored by Science on Wheels and NSF. Our goal was to explain in very simple terms the physics of viscous flows and Brownian motion. Teachers will then use this information to prepare classes on these subjects. Attached is a video of the…

Self Propulsion and Collective Behavior in Microorganisms

Microorganisms like bacteria, are one of the simplest systems in the living world. It is because of this that many studies have focused on the importance of colony formation, orientation, self-propulsion and collective behavior. Many researchers have been motivated by these natural systems to model the behaviors in artificially manufactured self- propelled catalytic particles using…

Brownian Dynamics Simulations (BDS)

Brownian dynamics simulations also known as BDS, is a computer-based simulation technique were a pre-design system is allowed to respond to any given configuration (in this case to an applied external forces/torque) to study the interaction inside the system. These interactions allowed the system to respond instantaneously to the given configuration, which causes the system…

Dynamic Light Scattering(DLS) diffusivity calculations

Dynamic light scattering, also known as quasi elastic light scattering (Quels) and photon correlation spectroscopy (PCS), measures the laser light that is scattered from dissolved macromolecules or suspended particles. Due to the Brownian motion of the molecules and particles in solution fluctuations of the scattering intensity can be observed. According to the semiclassical light scattering…

Nanotechnology for use in water treatment

About one billion people in the world don’t have access to clean water  since most of the water sources are contaminated. As world population increases, so does industrialization and urbanization. These socioeconomic developments generate an escalating demand for water, which causes all kinds of environmental and social dilemmas such as contamination of water resources with…

Janus particles and cancer treatment

A Janus particle is composed of two fused parts, two-faced, like the Roman god Janus of doorways who is usually depicted with his faces looking in opposite directions. These asymmetric particles have two distinctly different sides, i.e. each face made from a different surface chemistry, or substance, than the other one. This janus particle, named…

Video Particle Tracking (VPT)

Today, one of the must powerful tools to the study of a object movement behavior is the “Video Tracking”. In general, video tracking is the process of locating a moving object or multiple objects in a specific boundary over time using a camera. In other words,  it associate target object in consecutive videos frames. Exist…

Biofilters

Also known as biological filters are devices that remove a wide range of polluting compounds from a stream of fluid (air or water) through a biological process. How do Biofilters work? The air is drawn near the center of emanation and usually led to a conditioning chamber.  In the chamber the air is saturated with moisture and then guided to a fixed bed of biomass.  The pollutants are absorbed to the biofilm of biomass formed over the fill and subsequently are digested by microorganisms.  In our research group of bacteria motility we are…

More About E. Faecalis: The Main Character Of Our Research Project

Enterococcus faecalis (before 1984, E. faecalis was known asStreptococcus faecalis) is a gram-positive commensal bacteria that inhabits the gastrointestinal tract of humans and other mamals.  Like other species of the genusEnterococcus, E. faecalis can cause risky  infections in humans, especially in hospital setting.  The presence of Enterococci is enhanced because he had the ability to acquire resistance…