Janus emulsions stabilized by carbohydrate surfactants agglutinate in the presence of proteins or bacteria. Optical changes can be detected by a smart phone qualitatively and can also be processed to quantify the amount of analyte.
To demonstrate how these droplets could be used for sensing, the researchers placed them into a Petri dish atop a QR code that can be scanned with a smartphone. When E. coli are present, the droplets clump together and the QR code can’t be read.
The study found that the more time children between the ages of six months and two years spent using handheld screens such as smartphones, tablets and electronic games, the more likely they were to experience speech delays.
カナダ・オンタリオ州トロントの「Hospital for Sick Children（病気の子供のための病院）」の小児科医キャサリン・バーケン博士が行なった研究によれば、生後6か月から2歳までの子供によるスマホやタブレット、携帯ゲーム機などで遊ぶ時間が長いほど、言語の発達が遅れる可能性が高くなることが分かったそうです。
Twenty percent of the children spent an average of 28 minutes a day using screens, the study found.Every 30-minute increase in daily screen time was linked to a 49% increased risk of what the researchers call expressive speech delay, which is using sounds and words.
