from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more atoms; a group of like or different atoms held together by chemical forces.
- n. A small particle; a tiny bit.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds.
- n. A tiny amount.
from the GNU version of the Collaborative International Dictionary of English
- n. One of the very small invisible particles of which all ordinary matter is supposed to consist.
- n. The smallest part of any substance which possesses the characteristic properties and qualities of that substance, and which can exist alone in a free state.
- n. A group of atoms so united and combined by chemical affinity that they form a complete, integrated whole, being the smallest portion of any particular compound that can exist in a free state. Cf. Atom.
from The Century Dictionary and Cyclopedia
- n. The smallest mass of any substance which is capable of existing in a separate form — that is, the smallest part into which the substance can be divided without destroying its chemical character (identity).
- n. A very small particle or bit of something; a particle; an atom.
- n. In ornithology, the tread or cicatricula of a fecundated ovum.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. (nontechnical usage) a tiny piece of anything
- n. (physics and chemistry) the simplest structural unit of an element or compound
Each protein molecule is made up of several thousand atoms.
The labeled protein molecule is transported to a type of waste disposer inside the cell called the proteasome, which recognizes the label rather like a key fitting into a lock.
The ubiquitin molecule is transferred to a different enzyme,
In severe forms, the hemoglobin molecule is so deformed that it can't bind with oxygen, rendering the red blood cell useless.
The toxin molecule is composed of several parts, one of which
If now the protein molecule is broken down, this usually comes about with the introduction of the elements of water.
Thus the protein molecule is made up from such building blocks.
The haemoglobin molecule is four times as large, and its structure is known less thoroughly.
It was chosen for the initial attempt, partly because it could develop good crystals, and partly because the haemoglobin molecule is quite small for a protein molecule.
Its source makes no difference to the fact that the molecule is the same.