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Come in, you'll be sniffed here

05.04.2001

Employees of the University of Pennsylvania (USA) propose to install at airports and train stations a device they have developed - a cabin in which each passenger will be sniffed by an electronic nose.

Its sensitivity, higher than that of a dog's nose, makes it possible to confidently detect traces of drugs and explosives on the clothes and skin of a person entering the cabin in a few seconds. In the future, it is planned to adapt this device for use in security checkpoints: the individual smells of employees who are allowed access will be entered into the device’s memory.

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Schematic diagrams for kombucha 05.03.2023

Cheap, lightweight, flexible yet durable PCBs are essential for wearable electronics. Her future may be based on flexible schedules based on bacterial cultures known as kombucha, or kombucha.

SCOBY (a symbiotic culture of bacteria and yeast) creates a dense, gel-like mass that is held together by the cellulose fibers of the bacteria. In addition to being a popular drink, kombucha cultures promise to be a useful biomaterial.

A team of scientists from the University of the West of England at Bristol used commercial cultures of kombucha to grow bacterial mats and then dried the resulting products, applied to plastic or paper, at room temperature outdoors. The rugs do not tear or collapse even when immersed in water for several days. One of the tested mats withstood oven temperatures up to 200°C, although the material does ignite on contact with an open flame.

The researchers were able to print conductive polymer circuits on dried kombucha mats using an aerosol inkjet printer, and also successfully tested an alternative method of 3D printing a circuit from a conductive polyester-copper blend. They were able to attach small LEDs to electrical circuits using silver-filled epoxy. The circuits functioned even after they were repeatedly bent and stretched.

Unlike the live kombucha mats he has worked with in the past, the dried SCOBY mats do not conduct electricity, limiting its flow to a printed circuit. Rugs are lighter, cheaper and more flexible than their ceramic or plastic counterparts. Their potential applications include, for example, the creation of wearable sensors and other devices.

Experiments last year by researchers at Montana Technological University (MTU) and Arizona State University (ASU) showed that membranes grown from kombucha cultures were superior to commercially available membranes at preventing biofilm formation, a serious problem in water filtration.

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