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Any synthetic or semisynthetic organic chemical compound that resembles opium in its pharmacological action to reduce pain. An opioid is an organic chemical compound, created synthetically or semisynthetically, that duplicates the analgesic…

In physical chemistry, the various situations in which two or more phases (or states of aggregation) can coexist in thermodynamic equilibrium with each other, with the nature of the transitions between phases, and with the effects of temperature and…

A theory expressing the idea that life on Earth passed through an era when biological processes were carried out predominantly by ribonucleic acids, without the involvement of deoxyribonucleic acids or proteins. The RNA World theory (or hypothesis)…