The observations on the anomalous behavior of urea and the comparison between urea and thiourea in aqueous solutions have been examined by volumetric and ultrasonic sound velocity techniques at different temperature (298.15, 303.15, 308.15, 313.15, 318.15 and 323.15 K) , atmospheric pressure by using a high accuracy vibrating U-tube digital density and ultrasonic sound velocity analyzer. The apparent molar volume (ϕv) & apparent molar adiabatic compressibility (ϕk) have been calculated from experimental density and ultrasonic sound velocity data respectively and limiting apparent molar volume (ϕv0), limiting apparent molar adiabatic compressibility (ϕk0) have been evaluated from apparent molar volume vs. molality plot as intercept. Apparent molar expansibility (ϕE) was determined from apparent molar volume and hydration number (nH) from adiabatic compressibility. The results show very interesting information about strong solute-solvent & solute-solute interactions, and also elaborate the structure making or breaking behavior in the solution mixtures.

The volumetric studies on the binary aqueous solutions of sodium dodecyl sulphate (SDS) and ternary SDS-amino acid-water systems have been carried out as a function of concentration and at 15, 20 , 25 , 30 , 35 , 40 , 45 and 50 °C . In this study the variation of apparent molar volume (φ ν ) of SDS was observed in the low concentration region. The limiting apparent molar volume (φ 0 ν ) values of SDS in aqueous amino acid solutions are greater than those in water and increase with the concentration at all the studied temperatures. The greater φ 0 ν value in amino acid solution has been demonstrated strong ion-ion interactions in the ternary system. Apparent molar expansions (Φ E ) in aqueous solution and ternary SDS-amino acid-water systems are very sensitive to hydrophobic and hydrophilic solute-solute interactions. Expansibility, α and apparent molar expansion, Φ E reflect from the same structural alteration in the solutions. In our investigation, critical micelle concentration (c.m.c) of SDS at various SDS-amino acid-water systems also determined by apparent molar volume (φ ν ). Among various physical parameters, apparent molar volume, limiting apparent molar volume, Apparent molar expansion has been recognized as a quantity that is sensitive to structural changes occurring in solutions.

Indoor air quality is a major concern in recent years as people spend more of their time in indoors. The quality of indoor air can be deteriorated by a variety of pollutants such as microbial contaminants, volatile and semi volatile organics that can affect the comfort level of air and induce public health problem that threatens virtually all workers in offices and buildings. In most of the urban areas, source control is often ungovernable and unavoidable [1,2]. These pollutants are emitted from different sources such as vehicular exhaust from nearby traffic, biological contaminants, tobacco smoke, indoor activities such as cooking, household products, cooling and heating systems [3,4]. The quality of indoor air has a direct impact on human health in terms of lengthened exposure to pollutants by breathing. Subsequent to the oil crisis in 1970s, buildings were designed to be more energy efficient with better insulation [5,6]. This means that a lower air exchange rate is used and the pollutant concentration accumulated are often higher than the outdoor environment. The health effects of organic chemicals at low or moderate concentrations in the air can cause breathing problems, trigger asthma and reduce lung function. This phenomenon is

New natural compounds, Polygonolic acid (1), Polygonumate (2) and Hydropiperoic acid (3) along with some known compounds were isolated from aerial part of medicinal plant Polygonum hydropiper. The compounds were isolated upon repeat column chromatography, HPTLC, RP-18 reverse phase column of dichloromethane fraction of the crude methyl extract. Their structures were identified by using spectroscopic technique. Structure of Hydropiperoic acid (3) was identified by single crystal X-ray diffraction study. Microbiological activities of these compounds against some of phytopathogenic fungi and bacteria have been investigated in this study. Asian Australas. J. Biosci. Biotechnol. 2017, 2 (3), 204-213

Molecular interactions and aggregation behavior of cloxacillin sodium (CloNa) in water and aqueous NaCl solutions was studied through volumetric and ultrasonic sound velocity method at 298.15 K and atmospheric pressure. Density, ρ, and ultrasonic sound velocity, u, of cloxacillin sodium in water and aqueous NaCl solutions were measured with a digital density and ultrasonic sound velocity analyzer (DSA 5000, Anton Paar, Austria). And from the investigational data, apparent molar volume, ϕn, adiabatic compressibility, ϕS, apparent molar adiabatic compressibility, ϕk, limiting apparent molar volume, ϕn0, limiting apparent molar adiabatic compressibility, ϕk0, and aggregation concentration, CMC of cloxacillin sodium was calculated. The outcomes indication exhibits very significant evidence about the interactions among solute-solvent-co-solute (solute-solute, solute-solvent) and aggregation behavior in the aqueous environment and this result would be useful for the drug action in human body with pharmacological applications.