The gold sorption from thiosulphate solutions on carbon sorbents and on anion exchangers was studied. It was shown that the anion exchangers AV-17-10P and AP-100 are the most effective and selective at pH=5-8. These a...The gold sorption from thiosulphate solutions on carbon sorbents and on anion exchangers was studied. It was shown that the anion exchangers AV-17-10P and AP-100 are the most effective and selective at pH=5-8. These anion exchangers can be recommended for the gold recovery from the industrial solutions.展开更多
Among the numerous products so far promoted as effective urease and/or nitrification inhibitors, it is possible to detect a renewed interest in environmentally friendly tools, such as ammonium thiosulphate (ATS, (NH4)...Among the numerous products so far promoted as effective urease and/or nitrification inhibitors, it is possible to detect a renewed interest in environmentally friendly tools, such as ammonium thiosulphate (ATS, (NH4)2S2O3) which is currently used as fertilizer for N and S nutrition. Among contradictory results accounted in the current literature, there is reported that ammonium thiosulphate (ATS) exerts inhibitory activity at large but unlikely agronomic rates of 2500 - 5000 mg·kg-1 soil. We carried out a novel experiment aimed to: a) verify the inhibitory action of ATS, even when applied in soil at low rates (25 and 100 mg·kg-1 soil as S-ATS), towards urease activity and nitrification in urea treated and not treated soils;b) investigate on the influence of ATS on the soil microbial biomass as it is generally assumed that soil microorganisms are the main agents of urea hydrolysis. For these purposes we selected an arable sandy soil and a grassland sandy-loam soil which are treated with urea or/and ATS. Results obtained from this novel investigation showed that a) ATS significantly decreased urease activity in both soil types and that the exerted inhibitory effect was moderate and short-term;b) ATS retarded the hydrolysis of urea and lowered nitrate production in the urea treated soils;c) the available fraction of iron and manganese in the used soils might be involved in the mechanism of inhibition;d) ATS did not affect the size of soil microbial biomass pool;e) the efficiency of ATS as urease and nitrification inhibitor was more evident in the sandy soil. Because of its properties, ATS may be applicable on many crops without being harmful on the soil microbial pool.展开更多
The effect of bavistin and the ethylene inhibitor (silver thiosulphate) on shoot regeneration using nodal explants of Asclepias curassavica (L). has been investigated. Among the different concentrations studied, highe...The effect of bavistin and the ethylene inhibitor (silver thiosulphate) on shoot regeneration using nodal explants of Asclepias curassavica (L). has been investigated. Among the different concentrations studied, highest number of shoots was obtained on MS media with 200 mg/L bavistin. Among the varying concentrations (10-100 μM/L) of silver thio-sulphate tested, highest number of shoots was obtained on MS medium amended with 60 μM/L silver thiosulphate without growth regulators. This study also establishes the stronger cytokinin like activity of bavistin. Effect of different growth additives like coconut milk, ascorbic acid and casein hydrolysate were tested on direct shoot regeneration. Among the different growth additives tested casein hydrolysate showed better and reproducible result at 0.025% in combination with 3 mg/l KN + 0.5 mg/l NAA. Antioxidants, activated charcoals and polyvinyl pyrrolidone were used to remove phenolics. Activated charcoal removed the phenolic exudates completely at 0.025% and prevented the browning of media and thus enhanced the frequency of regeneration (85%). The microshoots developed through in vitro regeneration were transferred to rooting media containing IBA alone and in combination with KN and the highest number of roots was observed on MS medium with IBA 1 mg/L + 0.2 mg/L KN.展开更多
The effects of bavistin, cefotoxime and kanamycin along with the ethylene inhibitor silver thiosulphate on in vitro regeneration using the axillary buds of Solanum viarum (D.) have been investigated. Axillary bud expl...The effects of bavistin, cefotoxime and kanamycin along with the ethylene inhibitor silver thiosulphate on in vitro regeneration using the axillary buds of Solanum viarum (D.) have been investigated. Axillary bud explants when cultured on MS medium supplemented with bavistin (100 mg/l) maximum number of shoots (4.21 ± 0.83) were observed. In a separate experiment, bavistin along with growth regulators such as BAP and TDZ was added to MS medium containing sucrose (3%). Maximum number of shoots was obtained (5.55 ± 0.28) in MS medium supplemented with bavistin (100 mg/l) and BAP (2.0 mg/l). Cefotoxime and kanamycin (10-150 μM/L) were added to MS medium supplemented with BAP (2.0 mg/l) with sucrose (3%) having shown the maximum shoot regeneration (4.38 ± 0.45 and 3.4 ± 0.48) at 80 μM/L and 50 μM/L respectively. Similarly the regeneration medium was supplemented with (5.0-100 μM/L) of STS. Maximum number of shoots (4.75 ± 0.43) was seen with 40 μM/L. These plantlets were further maintained for root emergence on a rooting medium supplemented with growth regulators such as (0.5-2.0 mg/l) IAA, IBA and NAA. In MS medium supplemented with IBA (1.0 mg/l), maximum number of roots (24.3 ± 0.31) was seen with 100% regeneration. The rooted plants were acclimatized and transferred to field plots with (95%) of plant surviving in the field.展开更多
In the present work, we report the studies concerning liquid-liquid-solid equilibria for the ternary system sodium thiosulphate （Na2S203）＋t-butanol＋water at ambient pressure and at room temperature （303±2 K...In the present work, we report the studies concerning liquid-liquid-solid equilibria for the ternary system sodium thiosulphate （Na2S203）＋t-butanol＋water at ambient pressure and at room temperature （303±2 K）. The solubility data of Na2S203 are reported for solutions in water, t-butanol and solutions of varying concentrations of t-butanol in water. The phase diagram for the said system is developed, described and compared with similar systems studied such as Na2S2O3＋ethanol＋water, K2CO3＋methanol＋water, etc. These results have been explained in terms of structural properties of aqueous t-butanol solutions and further discussed in terms of the effect of ions to cause phase separation.展开更多
文摘The gold sorption from thiosulphate solutions on carbon sorbents and on anion exchangers was studied. It was shown that the anion exchangers AV-17-10P and AP-100 are the most effective and selective at pH=5-8. These anion exchangers can be recommended for the gold recovery from the industrial solutions.
文摘Among the numerous products so far promoted as effective urease and/or nitrification inhibitors, it is possible to detect a renewed interest in environmentally friendly tools, such as ammonium thiosulphate (ATS, (NH4)2S2O3) which is currently used as fertilizer for N and S nutrition. Among contradictory results accounted in the current literature, there is reported that ammonium thiosulphate (ATS) exerts inhibitory activity at large but unlikely agronomic rates of 2500 - 5000 mg·kg-1 soil. We carried out a novel experiment aimed to: a) verify the inhibitory action of ATS, even when applied in soil at low rates (25 and 100 mg·kg-1 soil as S-ATS), towards urease activity and nitrification in urea treated and not treated soils;b) investigate on the influence of ATS on the soil microbial biomass as it is generally assumed that soil microorganisms are the main agents of urea hydrolysis. For these purposes we selected an arable sandy soil and a grassland sandy-loam soil which are treated with urea or/and ATS. Results obtained from this novel investigation showed that a) ATS significantly decreased urease activity in both soil types and that the exerted inhibitory effect was moderate and short-term;b) ATS retarded the hydrolysis of urea and lowered nitrate production in the urea treated soils;c) the available fraction of iron and manganese in the used soils might be involved in the mechanism of inhibition;d) ATS did not affect the size of soil microbial biomass pool;e) the efficiency of ATS as urease and nitrification inhibitor was more evident in the sandy soil. Because of its properties, ATS may be applicable on many crops without being harmful on the soil microbial pool.
文摘The effect of bavistin and the ethylene inhibitor (silver thiosulphate) on shoot regeneration using nodal explants of Asclepias curassavica (L). has been investigated. Among the different concentrations studied, highest number of shoots was obtained on MS media with 200 mg/L bavistin. Among the varying concentrations (10-100 μM/L) of silver thio-sulphate tested, highest number of shoots was obtained on MS medium amended with 60 μM/L silver thiosulphate without growth regulators. This study also establishes the stronger cytokinin like activity of bavistin. Effect of different growth additives like coconut milk, ascorbic acid and casein hydrolysate were tested on direct shoot regeneration. Among the different growth additives tested casein hydrolysate showed better and reproducible result at 0.025% in combination with 3 mg/l KN + 0.5 mg/l NAA. Antioxidants, activated charcoals and polyvinyl pyrrolidone were used to remove phenolics. Activated charcoal removed the phenolic exudates completely at 0.025% and prevented the browning of media and thus enhanced the frequency of regeneration (85%). The microshoots developed through in vitro regeneration were transferred to rooting media containing IBA alone and in combination with KN and the highest number of roots was observed on MS medium with IBA 1 mg/L + 0.2 mg/L KN.
文摘The effects of bavistin, cefotoxime and kanamycin along with the ethylene inhibitor silver thiosulphate on in vitro regeneration using the axillary buds of Solanum viarum (D.) have been investigated. Axillary bud explants when cultured on MS medium supplemented with bavistin (100 mg/l) maximum number of shoots (4.21 ± 0.83) were observed. In a separate experiment, bavistin along with growth regulators such as BAP and TDZ was added to MS medium containing sucrose (3%). Maximum number of shoots was obtained (5.55 ± 0.28) in MS medium supplemented with bavistin (100 mg/l) and BAP (2.0 mg/l). Cefotoxime and kanamycin (10-150 μM/L) were added to MS medium supplemented with BAP (2.0 mg/l) with sucrose (3%) having shown the maximum shoot regeneration (4.38 ± 0.45 and 3.4 ± 0.48) at 80 μM/L and 50 μM/L respectively. Similarly the regeneration medium was supplemented with (5.0-100 μM/L) of STS. Maximum number of shoots (4.75 ± 0.43) was seen with 40 μM/L. These plantlets were further maintained for root emergence on a rooting medium supplemented with growth regulators such as (0.5-2.0 mg/l) IAA, IBA and NAA. In MS medium supplemented with IBA (1.0 mg/l), maximum number of roots (24.3 ± 0.31) was seen with 100% regeneration. The rooted plants were acclimatized and transferred to field plots with (95%) of plant surviving in the field.
文摘In the present work, we report the studies concerning liquid-liquid-solid equilibria for the ternary system sodium thiosulphate （Na2S203）＋t-butanol＋water at ambient pressure and at room temperature （303±2 K）. The solubility data of Na2S203 are reported for solutions in water, t-butanol and solutions of varying concentrations of t-butanol in water. The phase diagram for the said system is developed, described and compared with similar systems studied such as Na2S2O3＋ethanol＋water, K2CO3＋methanol＋water, etc. These results have been explained in terms of structural properties of aqueous t-butanol solutions and further discussed in terms of the effect of ions to cause phase separation.
