This research provides an atomistic picture of the role ions in modulating microstructural features oil-contaminated calcite surface. is crucial importance for rational design ion-engineered waterflooding, a promising technique enhancing oil recovery from carbonate reservoirs. Inspired by conventional lab-scale procedure, integrated series molecular dynamics (MD) simulations were carried out to...

Two new symmetrical bis-thiourea, 2,2'-[{(terephthaloylbis(azanediyl)bis(carbonothioyl) bis(azanediyl)}dipropanoic acid] (1A) and 3,3'-[{(terephthaloylbis(azanediyl)bis (carbonothioyl)bis(azanediyl)} dipropanoic acid] (1B) were synthesized by the reaction of terephthaloyl chloride with α- and β-alanine in good yields. Their binding properties were investigated with various metal cations using U...

Ramanathapuram is a drought-prone southern Indian district that was selected for conducting hydrogeochemical study. Groundwater samples from 40 locations were collected during January 2020 (pandemic interdiction according to COVID) and 2021. The properties of the groundwater evaluated compared with drinking water regulations assess their quality. order cation dominance as follows: Na+ > Ca2+...

Fluorimetric or spectrophotometric titrations with the appropriate cations gave Kd values of 2.9 +/- 0.2 nM and 89 +/- 5 microM respectively for the Ca2+ and Mg2+ complexes of quin 2 at pH 7.5. Mixtures of quin 2 and vitamin D-dependent Ca2+-binding protein from pig duodenum were titrated fluorimetrically with Ca2+ in the absence or presence of Mg2+. These measurements were used with the Kd val...

The bacterium Vibrio fischeri requires bacterial motility to initiate colonization of the Hawaiian squid Euprymna scolopes. Once colonized, however, the bacterial population becomes largely unflagellated. To understand environmental influences on V. fischeri motility, we investigated migration of this organism in tryptone-based soft agar media supplemented with different salts. We found that op...

We used cultivation-independent methods to investigate the prokaryotic biogeography of the water column in six salt lakes in Inner Mongolia, China, and a salt lake in Argentina. These lakes had different salt compositions and pH values and were at variable geographic distances, on both local and intercontinental scales, which allowed us to explore the microbial community composition within the ...

Huge waste generation by the rapidly growing Mamfe town is posing enormous environmental challenges. This work that aimed at examining implications of household on potable water sources, used mixed research design, combining descriptive and experimental approaches. Ground (Two wells, one borehole) surface (two streams) sources were sampled empirical data for physicochemical parameters (PH, EC, ...

In a previous paper [Gould, East, Froud, McWhirter, Stefanova & Lee (1986) Biochem. J. 237, 217-227] we presented a kinetic model for the activity of the Ca2+ + Mg2+-activated ATPase of sarcoplasmic reticulum. Here we extend the model to account for the effects on ATPase activity of Mg2+, cations and anions. We find that Mg2+ concentrations in the millimolar range inhibit ATPase activity, which...

The increasing population, erratic distribution of rainfall, and their rising demand for water in domestic irrigation are fulfilled by groundwater resources. Due to overexploitation, there is the deterioration quality, hence evaluate a study was undertaken understand suitability drinking as well purposes. For this study, five villages, namely Kumulur, Tachankurunchi, Pudurutamanur, Pandaravadai...