جستجوی مقالات مرتبط با کلیدواژه « bio-degradation » در نشریات گروه « پزشکی »

This research investigated the effects of various iron fertilizers and the introduction of Piriformospora indica (P. indica) fungus on the biodegradation of diesel oil in soil experiencing water deficiency.  

The treatments included applying pure Fe at rates of 0, 60, and 90 kg/ha, derived from Fe sulfate (FeSO4) and Fe slag (containing 58.2 % Fe2O3), in a diesel oil-contaminated soil with concentrations of 0 % and 8 % (W/W). These treatments were implemented in a corn plant cultivation system, where the plants were inoculated with P.indica fungus under conditions of drought stress. After 90 days, the plant and soil Fe concentration was determined by atomic absorption spectroscopy (AAS). Furthermore, the extent of diesel oil bio-degradation in the soil was assessed.

Applying 90 kg/ha pure Fe from Fe sulfate and Fe slag significantly enhanced the bio-degradation of diesel oil in the soil by 13.2 and 16.1 %, respectively. However, the efficiency of this process was lower under drought-stress conditions. In addition, Plant inoculation with P.indica significantly enhanced the diesel oil bio-degradation of the soil contaminated with 8 % (W/W) diesel oil under drought stress by 15.7 %. Moreover, the soil microbial activity was significantly increased by 14.1 %.  

The combined use of P.indica, along with iron slag and iron sulfate, markedly enhances the biodegradation process of diesel oil within the soil.

This study was conducted to investigate the effects of salicylic acid and rice husk ash on Pb and Cd concentration in pinto bean plants grown in soil that was contaminated with both diesel oil and heavy metals.

The treatments in this study included the application of rice husk ash to soil at concentrations of 0 %, 4 %, and 8 % (W/W) as well as the foliar application of salicylic acid to pinto bean plants grown in soil contaminated with diesel oil, Cd, and Pb at concentrations of 0 %, 4 % and 8 % (W/W). After a growth period of 90 days, the pinto bean plant was harvested and the concentration of Pb and Cd in the plants was measured using Atomic absorption spectroscopy. In addition, the extent of diesel oil bio-degradation in the soil was determined.

The results indicate a significant reduction in the concentration of Cd and Pb in pinto bean plants (by 11.7 and 15.4 %, respectively) due to the application of rice husk ash (8 % (W/W)) in the soil. Furthermore, the bio-degradation of diesel oil in the soil was found to be significantly enhanced, while the activity of plant enzymes APX and POX was observed to be decreased.

The interaction between rice husk ash and salicylic acid The reduction in Pb and Cd concentration was significantly influenced by, while the bio-degradation of diesel oil in the soil increased.

Today, soil pollution with heavy metals and petroleum compounds is one of the main environmental problems. This research was done to investigate the effect of drought stress, soil salinity, piriformospora indica (P.indica) and MWCNs on bio-degradation of diesel oil in the soil that contaminated with Pb and Cd under cultivation of triticale plant. Treatments consisted of applying MWCNs (2% (W/W)) in the Pb and Cd polluted soil that was simultaneously polluted with diesel oil (0, 5 and 10 % (W/W)) and the plants used in this study was inoculated with P.indica. After 70 days, plants were harvested and plant and soil Cd were measured using AAS. In addition, the degradation percentage of diesel oil in soil was determined. Soil application of MWCNs at the rate of 2 % (W/W) significantly increased the bio-degradation of diesel oil in the soil in the drought and salinity (6 dS/m) stress by 11.3 and 15.6%, respectively. In addition plant inoculation with P.indica significantly increased the bio-degradation of diesel oil in the soil by 12.3%. For salinity (6 dS/m) and drought stress, it was increased by 8.3 and 9.4%, respectively. In addition, the Pb and Cd concentration was decreased by 14.3 and 12.8, respectively, when the MWCNs was added to the soil (2 % (W/W)). Soil application of MWCNs (2 % (W/W)) and plant inoculation with P.indica not only increased the bio-degradation of diesel oil, but also decreased the plant Pb and Cd concentration that is a positive point in the environmental studies.