Background We see objects because they reflect light into our eyes. ... Draw a pencil line across the width of each paper strip, about one centimeter from the bottom end.

A diagnostic test that relies on a strip of filter paper and some cunning origami can quickly distinguish between different variants of SARS-CoV-2 (Nat. Biomed. Eng. 2022, DOI: 10.1038/s41551-022 ...

Paper test strips detect a hormone called human chorionic gonadotropin, which is produced during pregnancy. The test strip is treated with a chemical that changes colour when the hormone is present.

Background A flower’s pigments help to attract possible pollinators, such as honeybees, ... In paper chromatography a solution is dabbed onto the bottom of a paper strip, ...

Researchers at McMaster University have developed a paper strip test that is cheap to produce, extremely portable, simple to use, and detects E. coli in water in 30 minutes.

A simple and inexpensive paper strip test could help diagnose a case of the flu, and even identify the influenza strain that caused it, a new study finds. Photo by Adobe Stock/HealthDay News.

In 1977, two mathematicians created a conjecture that proposed the minimum size a paper strip needed to be in order to form an embedded strip. Although they proposed an aspect ration of 1.73 (or ...