Synthesis, In vitro Antifungal and Antitumour Activity of Some Triorganotin(IV) N,C,N-Chelates

The in vitro antifungal activity of compounds 1-3 ( { [ ( CH 3 ) 2 NCH 2 ] 2 C 6 H 3 } R 2 SnX ; (where X=Cl, R=n-Bu for 1, X=Br, R=n-Bu for 2 and x= PF 6 , R=n=Bu for 3)) was estimated with the help of a modified microdilution format of the M27-A guidelines and was compared with in vitro activity of their diphenyltin(IV) analogues 4 and 5 (where X=Br, R=Ph for 4 and X= PF 6 , R=Ph for 5), and of drugs currently in clinical use (ketoconazole, fluconazole and amphotericin B). It was found that in coordinating solvents the more soluble derivative 2 is less active than the phenyl one (4), and compounds 1 and 3 are even inactive

Analysis of the results of audits of quality management system-sales service of cars

The Author analyses his over years experiences and results with audits in brand car ´s service and sale areas. He acted on behalf of TÜV SÜD Automotive GmbH Munich - Germany. He hits of audit ´s consecution in compliance with ISO 9001 and above standard requirement car ´s producers. He withal adverts to effects implementation the Quality management systems at these services

Tin in Human Bones

TIN IN HUMAN BONES. The tin content in the bones of 149 skeletons from the 1st - 5th centuries A.D., and of 11 individuals of the recent population was determined. The bone samples were carbonized and analyzed through emission spectroscopy with a.c. excitation. The tin content in bones of recent populations not exposed to extra tin supply is about one order of magnitude higher than is the case with the bones od some populations that lived at the beginning of our era. The distribution of tin in long bones, dependent on age, as well as the sources and role of tin in environmental contamination are discussed

Diet reconstruction of the Sarmatians at Madaras

117 samples from the proximal femora were taken from 50 skeletons excavated from the Sarmatian cemetery at Madaras, situated on the southern part of the Hungarian Plain between the Danube and Tisza rivers. These skeletons date from the 3rd to the 5th century A.D. A trace element analysis was used in order to reconstruct their basic diet. The primary part of the Sarmatians' diet was vegetable as Sr, levels were high whereas the Zn levels were low. Low Pb concentrations in the. Sarmatians' bones, as compared to those of surrounding populations, testify to the low Pb of those surrounding populations, testify to the low Pb contamination in their diet

Qualitative Aspects of Machined Surfaces of High Strength Steels

AbstractThe aim of this paper was to assess the impact of cutting speed in grinding quality of the surface layer test samples of heat-and chemically processed steel. To fulfill these objectives have been used experimental and computational methods, including statistical evaluation. Technology grinding was performed without cooling recess manner. The following were used grinding wheels-porous A9980K9V and A9980K13V. As machined materials were selected tool steel 19436.4, cemented and hardened steel 14109.4 and steel 16420.4. The hardness of steel is in the range of HRC=61÷62. The work follows the qualitative indicators to assess the integrity of the most common surface finish. These characteristics create conditions affecting the fatigue strength against wear, corrosion stability, quality and fits under

Reconstruction of diet of population from Roman period (1st-4th c. A.D.) on Pruszcz Gdański cemetery material

The cemeteries of the Wielbark culture in Pruszcz Gdański date back to the beginning of our era. Their location near the Baltic Sea suggests some connection with Germanic tribes. In an attempt to reconstruct the diet of the buried there, 182 bone samples were taken from 48 skeletons there and subjected to analysis for chemical elements. The data show the bone samples had a zinc-dominant microelement composition that has been also observed at Germanic burial places situated along the frontier of the Roman Empire. Our supposition is that the diet of the population was dictated by their customs rather than by the natural environment conditions there

Experimental Investigation into Wear and Tool Life of Milling Cutter PVD Coated Carbide Inserts While Armox 500 Steel Hard Milling

The goal of the submitted paper is to evaluate the dependence of tool life T = f(vc) in hard rough face milling process of the Armox 500 steel through the PVD coated cemented carbide cutting material with SNHF 1204EN-SR-M1 tool insert geometry. Practical tests of choice material were performed in the milling machine tool with vertical axis. The effect of applied cutting conditions on the surface finish, tool life, wear of cutting tool, such as flank wear and surface structure of applied cutting inserts, was investigated during the performed experiments. The goal of this article is to research the impact of various cutting speeds values during the process of hard face rough milling. Experiments are carried out with an aim to study tool life, surface finish and flank wear prediction on the PVD coated cemented carbide cutting material in hard milling processes. This has been observed through the REM and mathematical method of least squares for this characterization. The presented approach and acquired results will prove themselves helpful in understanding the machinability of Armox 500 steel during the hard milling process