The phase transition of active pharmaceutical ingredients should be taken into account during manufacturing, processing- and storage, because different crystal forms lead to different physical properties of formulations. The phase transition of clarithromycin (CAM) metastable form I to stable form II was investigated on heating with additives such as fatty acids or fatty acid esters. Differenti...

A laboratory experiment was performed to examine the remobilization of indicator polychlorinated biphenyls (iPCBs) from sediments and its results were applied to the real-world data for explaining the transport of PCBs in river. Seven PCB concentrations were determined in three series of model water-sediment systems (3 g of river sediment, three different volumes of distilled water (0.5, 0.25, ...

Oxygen minimum zones (OMZs) that impinge on continental margins favor the release of phosphorus (P) from the sediments to the water column, enhancing primary productivity and the maintenance or expansion of low-oxygen waters. A comprehensive field program in the Peruvian OMZ was undertaken to identify the sources of benthic P at six stations, including the analysis of particles from the water c...

The wide use of metal-based nanomaterials such as zinc oxide (ZnO) nanoparticles (NPs) has generated concerns regarding their environmental and health risks. For ZnO NPs, their toxicity in aquatic systems often depends on the release of dissolved zinc species, and the rate of dissolution is influenced by water chemistry, including the presence of zinc-chelating ligands. A challenge, however, re...

A two-stage sintering practice was applied to W­3.99Ni­1.71Fe (mass%) to control its microstructural evolution and, accordingly, mechanical properties under high strain rates. Unlike the traditional one-stage liquid phase sintering, the alloy was first solid-state-sintered to close to full densification, and then liquid-phase-sintered by induction heating where the cooling rate was fast. With t...

A number of methods of measuring equilibria between solids and compressed gases have recently been described 1 and the results have been discussed in terms of molecular interactions in the gas phase.2 In the present paper, the experimental method used to investigate the system p-chloro.iodobenzene + ethylene will be described and the results will be given in detail. The measurements consisted i...

In this research an ultra-fine grained composite structure consisting of an intermetallic matrix together with dispersed nano-sized Al2O3 obtained via mechanical activation of TiO2 and Al in a high energy ball mill and sintering of consolidated samples. Phase composition and morphology of the milled and sintered samples were evaluated by XRD and SEM techniques Thermal behavior of the powder sa...

A framework for kinetic modelling and evaluation of the reaction intensification O 2 -dependent enzyme catalyzed reactions is built from measurements consumption rates initially dissolved in homogeneous liquid phase.

We discuss the problem of rototranslational diffusion of a rigid biaxial molecule dissolved in a uniaxial smectic liquid crystal phase. We examine distorted rod and disk like molecules and show how biaxiality and rototranslational coupling can produce significant effects on some of the correlation functions and spectral densities most useful in analyzing experimental observables.

Dissolved total saccharides (DTS) and dissolved free monosaccharides (DFMS) in streamwater were determined by high-performance liquid chromatography with pulsed amperometric detection (HPLC-PAD). HPLC identification was verified with gas chromatography/mass spectrometry measurements. The method for DTS was improved by using a column with an anion exchange capacity of 4,500 Fq and a mobile phase...