During the course of an investigation into the excretion of “detoxication products” in the chicken (1) the need arose for a reasonably simple and reliable method for the estimation of “ethereal sulfate” in quantities of 0.1 to 1 mg. of SOa in volumes of some ml. of chicken urine. As none of the methods tried seemed satisfactory in the form described, a modification was developed. It appears tha...

The promise of coupling between magnetization and electric polarization and the potential to manipulate one through the other has become in recent years a driving force for many experimental works on multiferroic materials. The ultimate goal of these studies would be a single-phase material exhibiting a strong coupling between inherent ferromagnetic and ferroelectric ordering at room temperatur...

Crystallisation of barium carbonate from alkaline silica solutions results in the formation of extraordinary micron-scale architectures exhibiting non-crystallographic curved shapes, such as helical filaments and worm-like braids. These so-called ‘‘silica biomorphs’’ consist of a textured assembly of uniform elongated witherite nanocrystallites, which is occasionally sheathed by a skin of amorp...

Cyanobacteria have affected major geochemical cycles (carbon, nitrogen, and oxygen) on Earth for billions of years. In particular, they have played a major role in the formation of calcium carbonates (i.e., calcification), which has been considered to be an extracellular process. We identified a cyanobacterium in modern microbialites in Lake Alchichica (Mexico) that forms intracellular amorphou...

The emergence of complex nano- and microstructures is of fundamental interest, and the ability to program their form has practical ramifications in fields such as optics, catalysis, and electronics. We developed carbonate-silica microstructures in a dynamic reaction-diffusion system that allow us to rationally devise schemes for precisely sculpting a great variety of elementary shapes by diffus...

Objectives. Triple barium–strontium–calcium carbonates of various grades are widely used for depositing oxide coatings on cathodes electrovacuum devices. Of all types in devices, among the most common, due to combining efficiency, durability, operation at relatively low temperatures, and a cost. The aims this work were to: create technology synthesis triple with nonequilibrium phase composition...

The International Programme on Chemical Safety (IPCS), established in 1980, is a joint venture of the United Nations Environment Programme (UNEP), the International Labour Organization (ILO), and the World Health Organization (WHO). The overall objectives of the IPCS are to establish the scientific basis for assessment of the risk to human health and the environment from exposure to chemicals, ...

A clinically useful spectrophotometric method for the determination of 3-methoxy-4hydroxyphenyiglycol (MHPC) is presented. After treatment with barium chloride, the urine is hydrolyzed with Glusulase ($-glucuronidase and sulfatase).f The hydrolysate is passed through a column of Amberlite CG-4Bt to remove any 3methoxy-4-hydroxymandelic acid (MHMA) and the pH is adjusted to neutral. The MHPG is ...

The stability of barium carbonate (BaCO3) suspensions in the presence of the dispersants, xanthan gum, sodium carboxymethylcellulose and carrageenan, has been studied using a phase separation technique. These materials have been found to stabilise the BaCO3 suspensions by increasing the viscosity of the medium. Of the three polymer dispersants, xanthan gum is the most effective in stabilising a...

Presently, the ferrites industry consumes large amounts of iron osides obtained by spray roasting of steel pickling liquors. The aim of this paper is to propose the synthesis of optimal iron osidcs by oxyprecipitation of steel pickling liquors in order to obtain Bahexafenite wit11 high magnetic properties using the ceramic process. As a raw material. i t was used sulphuric liqoors with iron con...