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Microplastics found in plant leaves

19.09.2022

In the studied samples of plant leaves, scientists for the first time found traces of microplastics. The discovery was made at the University of Presov in Slovakia.

Plants of the genus Dipsacus have characteristic paired leaves. They form a kind of receptacles that collect water and attract insects to it. Fragments and fibers of multi-colored microplastics up to 2,4 mm long were found there.

No extraneous sources of pollution around the area were recorded, so the plastic got into the flowers from the polluted atmosphere, the scientists concluded.

The appearance of plastic in plants is an indicator of possible current and environmental pollution by microplastics. However, as noted, further research is needed to obtain accurate information and test the methodology for a possible assessment of the local load of microplastics on the environment.

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Low frequency sound is better distributed and heard from a distance. In the roar of the Amur tiger, the main energy falls on low sounds with a frequency of about 300 hertz with components lying in the infrasound region below 20 hertz. These frequencies pass better through the dense undergrowth that is common in tiger habitats. The researchers even measured the response of the tiger's brain to sounds of different frequencies by inserting electrodes into the brains of sedated Amur, Sumatran and Bengal tigers.

It turned out that the hearing of the tiger is most sensitive to sounds with a frequency of about 500 hertz (in humans - about 1000 hertz). The tiger uses low frequency sounds to drive competitors away from its hunting ground and to attract mates.

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