To a human, microplastics are very small at less than 5 millimeters (mm) wide. But to an insect, microplastics might be the same size as the food they usually eat. Researchers reporting in ACS’ Environmental Science & Technology have shown that crickets can and will consume polyethylene microplastics if their mouth is larger than the plastic particle. The study suggests that crickets — and likely many other insects — cannot distinguish plastic from food.

Whether you’re a home gardener or an industrial farmer, you might be familiar with mulching films — plastic sheets laid over the soil to protect seedlings and promote crop growth. But like many other plastic materials, these films can release damaging microplastics and don’t have any insect-repelling power. So, a team reporting in ACS Agricultural Science & Technology has developed an alternative biodegradable mulching film that also naturally repels pests using citronella oil.

Move over, colonoscopies — researchers report in ACS Sensors that they’ve developed a sensor made of tiny microspheres packed with blood-sensing bacteria that detect markers of gastrointestinal disease. Taken orally, the miniature “pills” also contain magnetic particles that make them easy to collect from stool. Once excreted from mouse models with colitis, the bacterial sensor detected gastrointestinal bleeding within minutes. The researchers say the bacteria in the sensor could be adapted to detect other gut diseases.