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Ultraviolet-sensitive bead. Ultraviolet-sensitive beads (UV beads) are beads that are colorful in the presence of ultraviolet radiation. Ultraviolet rays are present in sunlight and light from various artificial sources and can cause sunburn or skin cancer. [1] The color change in the beads alerts the wearer to the presence of the radiation.
Microbead (research) Microbeads, also called Ugelstad particles [1] [2] [3] after the Norwegian chemist, professor John Ugelstad, who invented them in 1977 and patented the method in 1978, [4] are uniform polymer particles, typically 0.5 to 500 microns in diameter. Bio-reactive molecules can be absorbed or coupled to their surface, and used to ...
A common laboratory-scale mechanical method for cell disruption uses glass, ceramic, or steel beads, 0.1–2 mm (0.004–0.08 in) in diameter, mixed with a sample suspended in an aqueous solution. First developed by Tim Hopkins in the late 1970s, the sample and bead mix is subjected to high level agitation by stirring or shaking.
The CPSC recorded nearly 7,000 water bead-related ingestion injuries in emergency rooms between 2018 and 2022. The agency issued warnings this week about two products with toxicity risk, urging ...
The ultraviolet catastrophe, also called the Rayleigh–Jeans catastrophe, was the prediction of late 19th century to early 20th century classical physics that an ideal black body at thermal equilibrium would emit an unbounded quantity of energy as wavelength decreased into the ultraviolet range. [ 1]: 6–7 The term "ultraviolet catastrophe ...
Orbeez water beads, before and after being added to water. Expandable water toys (also grow-in-water toys or grow monsters) are novelty items made from a superabsorbent polymer. They are toys that expand after putting them into water for anything from a few hours up to several days, depending on size. They shrink in saltwater or when exposed to ...
Chain fountain. The chain fountain phenomenon, also known as the self-siphoning beads, Mould effect, or Newton beads is a physical phenomenon observed with a chain placed inside a jar. One end of the chain is pulled from the jar and is allowed to fall under the influence of gravity. This process establishes a self-sustaining flow of the chain ...
Sticky bead argument. In general relativity, the sticky bead argument is a simple thought experiment designed to show that gravitational radiation is indeed predicted by general relativity, and can have physical effects. These claims were not widely accepted prior to about 1955, but after the introduction of the bead argument, any remaining ...
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