Research Keyword: soil contamination

The Importance of Humic Acids in Shaping the Resistance of Soil Microorganisms and the Tolerance of Zea mays to Excess Cadmium in Soil

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This research explores how humic acids, which are natural organic substances found in soil, can help protect plants and soil bacteria from cadmium, a toxic heavy metal. When cadmium contaminated soil, the application of humic acid preparation called Humus Active promoted the growth of specialized bacteria that can tolerate and break down cadmium. As a result, corn plants grew better and maize biomass increased significantly when the soil was treated with the humic preparation, suggesting this is a practical solution for farming on contaminated land.

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Cadmium and Lead Tolerance of Filamentous Fungi Isolated from Contaminated Mining Soils

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Researchers found several types of fungi thriving in extremely contaminated mining soils in Mexico. These fungi can survive in environments with toxic levels of lead and cadmium that would kill most organisms. The most promising fungus, Paecilomyces lilacinus, can tolerate both metals and could potentially be used to clean up heavily polluted mining sites by binding and immobilizing these dangerous metals in the soil.

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Fluorescence-Based Soil Survival Analysis of the Xenobiotic- and Metal-Detoxifying Streptomyces sp. MC1

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Scientists developed a way to track a soil bacterium called Streptomyces sp. MC1 that can clean up polluted soils by breaking down harmful chemicals and reducing toxic metals like chromium. They added a glowing green fluorescent protein to the bacteria so they could easily see where the bacteria were and how long they survived in contaminated soil. In tests with soil contaminated with two different pollutants, the tagged bacteria successfully removed over 96% of chromium and 65% of lindane over 28 days, demonstrating the approach works for monitoring bioremediation efforts.

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Cadmium and Lead Tolerance of Filamentous Fungi Isolated from Contaminated Mining Soils

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Researchers isolated six types of fungi from mining-contaminated soil in Mexico that can survive in extremely toxic environments with high levels of lead and cadmium. These fungi have developed special strategies to handle these dangerous metals, with one species, Paecilomyces lilacinus, showing exceptional ability to tolerate both metals simultaneously. These findings suggest these fungi could be used to clean up contaminated soils in mining regions, offering hope for environmental remediation efforts.

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