A research team from the Rural Development Administration (RDA) and Gyeongsang National University has announced the development of a microorganism capable of decomposing agricultural waste vinyl. This breakthrough has the potential to address the environmental issues caused by the disposal of these materials.   

Agricultural waste vinyl is primarily composed of low-density polyethylene (LDPE), a substance with a tough chemical structure that is difficult to break down naturally. The disposal of this vinyl, often by burying it in the soil, leads to soil contamination and other environmental problems.   

While previous research has explored the biodegradation of LDPE using microorganisms, the process has been slow, with the initial surface oxidation stage alone taking several months. This has highlighted the need for the development of more efficient microorganisms and decomposition processes.

The research team has successfully isolated a microorganism, Acinetobacter nosocomialis GNU001, that is capable of decomposing LDPE. They have also optimized the microorganism's culture conditions and developed a decomposition process that is 1.5 to 4.5 times faster than previously reported methods.   

This new process involves mass-culturing the microorganism in a nutrient-rich medium to increase its cell density, and then introducing it into a bioreactor containing LDPE film. The research team observed the formation of holes in the LDPE film after just 28 days using this technique.

Furthermore, the team has analyzed the genome of Acinetobacter nosocomialis GNU001 and identified key genes and enzymes involved in the decomposition of LDPE. This discovery has paved the way for the development of synthetic microorganisms with enhanced decomposition capabilities through enzyme modification and expression on the cell surface.

The RDA plans to utilize these research findings in future projects focused on reducing plastic waste and developing upcycling technologies. This breakthrough represents a significant step towards the environmentally friendly disposal of agricultural waste vinyl and holds promise for addressing the global plastic waste problem.

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