a stream of molecules freed from a substance, usually a salt, by evaporation and then passed through a narrow slit for focusing, for investigating the properties of nuclei, atoms, and molecules.
(physics) a parallel beam of molecules that are at low pressure and suffer no interatomic or intermolecular collisions
noun 1. the branch of biology that deals with the nature of biological phenomena at the molecular level through the study of DNA and RNA, proteins, and other macromolecules involved in genetic information and cell function, characteristically making use of advanced tools and techniques of separation, manipulation, imaging, and analysis. noun 1. the study of […]
noun 1. the changes in the amino acid sequences of proteins that take place during evolution and speciation, and from which the dates of branchings of taxonomic groups can be deduced. noun the rate at which nucleotide (amino acid) substitutions occur in a given DNA (protein) sequence
- Molecular cloud
noun 1. a cool dense interstellar region composed of a wide variety of molecules, mainly hydrogen, plus some dust, in which stars are forming noun a large and dense cloud of cold gas and dust in interstellar space from which new stars are formed Examples It is believed that the creation of newborn stars occurs […]
- Molecular disease
molecular disease n. A disease in which there is an abnormality in or a deficiency of a particular molecule, such as hemoglobin in sickle cell anemia.