Abstract The cement behind casings is an important barrier element in wells that should provide zonal isolation along the well. hardened does not always isolate permeable formations, either due to placement issues or loads over time compromise integrity of barrier. modern method used characterize annular material ultrasonic logging which provides essential information concerning type casing, bu...

Current sustainability assessment (SA) tools to help deal with contaminated groundwater sites are inherently subjective and hardly applied. One reason may be lack of proper for addressing contaminant spread which basically objective. To fill this gap, there is a need transport models that provide site managers needed room applying their judgments considerations about the efficiency each remedia...

The removal of groundwater contamination is a complex process due to the hydro-geochemical characteristics specific site, related maintenance and possible presence several types pollutants, both organic inorganic. In recent decades, there has been an increasing drive towards more sustainable treatment for contaminated as opposed intensive treatments, i.e. with high requirements onsite infrastru...

Epithelial tight junctions (TJs) are the key structures regulating paracellular trafficking of macromolecules. The TJ is multi-protein complex that forms a selective permeable seal between adjacent epithelial cells and demarcates the boundary between apical and basolateral membrane domains. Disruption of the intestinal TJ barrier, followed by permeation of luminal noxious molecules, induces a p...

IT is well established that certain chemical or mechanical injuries to the blood-aqueous barrier are frequently followed by the formation of a proteinrich aqueous humour and an increase in intra-ocular pressure (I.O.P.). It seems likely that in both cases the rate of aqueous formation is increased and that the capillaries of the anterior uvea and the ciliary epithelium become more permeable to ...

Mucosal barriers separate self from non-self and are essential for life. These barriers, which are the first line of defense against external pathogens, are formed by epithelial cells and the substances they secrete. Rather than an absolute barrier, epithelia at mucosal surfaces must allow selective paracellular flux that discriminates between solutes and water while preventing the passage of b...

The ability of mucus to function as a protective barrier at mucosal surfaces rests on its viscous and elastic properties, which are not well understood at length scales relevant to pathogens and ultrafine environmental particles. Here we report that fresh, undiluted human cervicovaginal mucus (CVM) transitions from an impermeable elastic barrier to non-adhesive objects sized 1 microm and larger...

Tight junction proteins are important for intestinal homeostasis. They prevent paracellular transport of large molecules and maintain cell polarity. Impaired tight junction function leads to a more permeable intestinal epithelial barrier and therefore potentially increases disease risk. Limited information is available concerning the effects of food components on the intestinal barrier, particu...

Abstract Purpose of Review This paper reviews various low-cost treatment techniques such as adsorption, permeable reactive barrier, and biological for the simultaneous removal chemical microbial contaminants from groundwater discusses mechanisms different techniques. also challenges treatment, how to choose appropriate technique, cost analysis treatment. Recent Findings Various technologies hav...