Improvement of operational control of internal precision of fire assay results for geological samples of gold-bearing ores

An algorithm of operational control of internal precision of fire assay results is proposed for geological samples of gold-bearing ores of the first group. The algorithm allows the labor inputs and the cost of this type of control activities to be reduced.     

Patterns of cell functioning in starvation (exemplified by isolated roots)

Comparison is made over physiology of the cells of isolated roots with those of animals under long-term starvation conditions. General mechanisms of functioning of such cells are exposed. It is shown that cut-off roots could be used as proper model for the studying physiology of the cell starvation.     

The functional organization of the posterior lateral nucleus of the rat hypothalamus

It has been demonstrated that the posterior lateral thalamic nucleus of the rat receives information from the visual, somatic and auditory systems. Some of the neurons (63%) have a convergent input from these systems, although these neurons exhibit functional specificity with respect to the predominant inhibitory influence of the background activity of one of the sensory systems investigated. The other part of the neurons (37%) receives information only from the visual or somatic system, these neurons exhibiting excitatory phasic reaction to sensory stimuli.     

Solving the Problems of High-Temperature Sulfur Corrosion in Primary Oil Refineries

Chemistry and Technology of Fuels and Oils - This article examines the effect of natural sulfur-containing oil compounds on the corrosion state of plant. It states that the main reason for the...     

Residual stresses in the graded interlayer between W and CuCrZr alloy

Journal of Materials Science - One of the big challenges for realizing future nuclear fusion reactors is the development of materials able to withstand the high thermal loads and particle fluxes...     

New data on determination of rare and trace elements in geological standards using inductively coupled plasma mass spectrometry

Average grades of 39 elements are determined for ten Russian (Vinogradov Institute of Geochemistry) geological standards (GSs) with different compositions; some of the standards were not certified or had only recommended status. In addition, the grades of a number of certified elements (Ba, Sr, Ni, Eu, etc.) in early GSs (SG-1A, ST-1A and SGD-1A) are determined more exactly. The analysis is performed using the highly efficient inductively coupled plasma mass spectrometry (ICP-MS) method. The ICP-MS method is described, including sample preparation procedures and other analysis conditions. The required metrological characteristics (detection limits and repeatability and correctness of assay results) are assessed. The grades of elements determined in the GSs can be helpful in analytical practice for calibration and assessment of the correctness of the assay results.