Radium is a silvery white metal that does not occur free in nature.
One of Lawrence's cyclotrons produced technetium, the first element that does not occur in nature to be made artificially.
Furthermore, P. falciparum GDH possesses a unique N-terminal extension that does not occur in any other GDH sequence so far studied.
That raises a problem that does not occur with an insentient beast like the Japanese supercomputer -- persuading it that your problem is worth fooling with.
Dr. Borst found that beryllium 7, an isotope of beryllium that does not occur naturally on earth, is formed in supernovae by the fusion of two helium nuclei.
Hydrogenation causes the formation of titanium hydrides and lattice distortions of α Zr at the low bias voltage that does not occur at higher bias voltages.
This means that if one applies electricity with a certain voltage to a chemical system, one can initiate a chemical reaction that does not occur naturally.
Unfortunately, the Court ruled that the product of any modification to a plant's genome "in a way that does not occur naturally" should be considered a GMO.
GMOs, or genetically modified organisms, are organisms in which the genetic material (DNA) has been altered in a way that does not occur naturally.
This notification requirement shall not apply to any petition submitted pertaining to a species that does not occur within the United States.
Third, a synthesis may be carried out to obtain a compound of specific structure that does not occur naturally and has not previously been made.
