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[en] Full text: Results of thermoanalytical studies of stability and chemical activity in respect of metals (iron,copper) have been obtained in terms of derivatograph of acetoxy and benzoyloxymethyl ethers of isopropylxantogenik, diethyldithiocarbamic and diizopropylditiophosphoric acids as loadcarrying additivies to lubricating oils. It showed that stability of studied compounds against thermal influences are at the range of 135-215 degree C. It revealed that the reaction ability of analyzed ethers to iron are correlated with their loadcarrying effectiviness
[en] Effect of organic acid on the preparation of indium-oxalate salt from indium scraps generated from ITO glass manufacturing process was studied. Effects of parameters, such as type and concentration of organic acids, pH of reactant, temperature, reaction time on indium-oxalate salt preparation were examined. The impurity removal efficiency was similar for both oxalic acid and citric acid, but citric acid did not make organic acid salt with indium. The optimum conditions were 1.5 M oxalic acid, pH 7, 80 .deg. C, and 6 hours. On the other hand, the recoveries increased with pH, but the purity decreased. The indium-oxalate salt purity prepared by two cycles was 99.995% (4N5). The indium-oxalate salt could be converted to indium oxide and indium metal by substitution reaction and calcination
[en] In soybean previous studies enabled the identification of MAPK3 and 6 whose activity is enhanced within the signaling pathway leading to defense reactions. In this study the effects of different compounds related to hemeoxygenase (HO-1) biosynthesis on mitogen-activated protein kinase (MAPK’s) genes expression in soybean seeds were tested. To this end, 20μM hemine, 22μM ZnPPIX, 0.5mM furidine or 100μM 8-bromoguanosine 3',5'-cyclic monophosphate (8Br) were added to pre-hydrated seeds for 5 days. MAPK’s genes expression was enhanced in seeds treated with hemine. This result indicates that heme catabolism could be involved in the signaling mediated by this cascade pathway. To confirm this hypothesis experiments were carried out in the precsence of ZnPPIX, a potent irreversible HO-1 inhibitor. In this case, no gene induction was observed. On the other hand, 8Br, a cGMP analog, induced HO-1 gene expression but did not modulate MAPK’s, indicating that this effect could not be mediated by cGMP. When the action of furidine, an abscisic acid inhibitor, was tested a diminution of HO-1 gene expression was observed. In this regard, MAPK’s showed a different response, being MAPK6 the only transcript that showed a diminished respect to controls, while MAPK3 mRNA as well as MAPKK1 was enhanced. These results were confirmed by western blotting and activity determinations. (authors)
[en] We determinated different forms of iron and aluminium sesquioxyde in the soil samples from Kimwenza. Their behaviour in the profile have been evaluated according with organic matter and clay influence in the migration processes. The evolution sequences from those sesquioxydes have allowed permitted the determination of the level alteration material. This latler is situated at one intermediate alteration phase coresponding to the Ferrisol formation.
[en] The optimal conditions of acid decomposition of solid residuum from waterprocessing of cake might consider: the temperature of aciddecomposition-98-100digC; concentration of HCl-18-20%; dosage ofHCl-105-120%; process duration-80-90 minutes