A permeable reactive barrier, or “PRB,” is a wall constructed below ground to clean up contaminated groundwater. The wall is “permeable,” which means that contaminated groundwater can flow ...

Bangalore-based researchers have developed a permeable reactive barrier (PRB) toilet which uses a mixture of sand and bentonite clay. While thousands of toilets prop up across the country, there has ...

The blood-brain barrier is selectively permeable and blocks unwanted molecules from entering ... releasing toxic molecules and reactive oxidants and producing damage. In contrast, only a few ...