Sentences with phrase «scratched by a needle»

When Oudhoff applied human saliva to skin - cell cultures scratched by a needle, however, he found that the concentrations of growth factors were too low to have any therapeutic effect.

Common skin - prick tests, in which a person is scratched by a needle coated with proteins from a suspect food, produce signs of irritation 50 to 60 percent of the time even when the person is not actually allergic.

Not exact matches

GERBER: Our sole idea in developing AFM was to image nonconductive surfaces, such as ceramics or biological materials, at atomic resolution by scratching a very fine needle on a long arm, or cantilever, over that surface.

He then began making sounds with records on turntables, sampling various tracks and emphasizing the noises made by scratching a needle on the record's surface.

Jamie draws on large smooth plates of wet clay, by reacting to draw lines and create forms using both his hands, fingers, and a large needle to mark shapes as he etches incisions, scratches, or stipples, which he then quickly scrapes or smooths out, in order to start again.