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| Electrode | The pole or plate of an electrolytic cell by which the current enters or leaves the cell. |
| Electrolysis | Electrolysis is the process of the passage of an electric current through a solution with simultaneous chemical changes either in the electrodes or in the solutions in contact with the electrodes, or both. |
| Electron | The most elementary negatively charged particle which is the constituent of all matter. It is the electrical opposite of the proton. Its mass is approximately 1/1845 of that of the proton. Electrons constitute cathode rays and beta rays, and are emitted by hot bodies. |
| Embryo | A young organism in the early stages of development used also to describe the part of the cereal grain from which plant and root originate. |
| Empirical | Depending on experience or observation alone. |
| Emulsion | The product of the dispersion of one liquid in another liquid, the dispersed phase particles being larger than colloidal size. |
| Endonuclease | An enzyme that breaks nucleic acids at specific interior bonding sites, thus producing nucleic acid fragments of various lengths. Cf. Exonuclease. |
| Endosperm | The nutritive tissue formed within the embryo sac in seed plant. |
| Enzyme | A catalyst made by a living cell. The brewer often supplements the natural enzymes of malt and grist with industrial enzymes which are extracted from plants or prepared by letting selected organisms "ferment" specially formulated media. |
| Enzyme | A protein catalyst that facilitates specific chemical or metabolic reactions necessary for cell growth and reproduction. |
| Escherichia coli (E. coli) | A bacterium that inhabits the intestinal tract of most vertebrates. Much of the work using recombinant DNA techniques has been carried out with this organism because it has been genetically well characterized. |
| Essential | Any one of a class of odoriferous, volatile liquids, Oil insoluble in water, which are obtained from plants to which they impart odors and other characteristic properties. |
| Ester | Product of a reaction between an acid and alcohol. |
| Eukaryote | A cell or organism containing a true nucleus, with a well-defined membrane surrounding the nucleus. All organisms except bacteria, viruses, and blue-green algae are eukaryotic. Cf Prokaryote. |
| Evaporation | The loss of water or volatile substances from liquids or solids. |
| Exon | In eukaryotic cells, the part of the gene that is transcribed into messenger RNA and encodes a protein. See also intron, splicing. |
| Exonuclease | An enzyme that breaks down nucleic acids only at the ends of polynucleotide chains, thus releasing one nucleotide at a time, in sequential order. Cf. Endonuclease |
| Expression | In genetics, manifestation of a characteristic that is specified by a gene. With hereditary diseases, for example, a person can carry the gene for the disease but not actually have the disease. In this case, the gene is present but not expressed. In industrial biotechnology, the term is often used to mean the production of a protein by a gene that has been inserted into a new host organism. |
| Extract | The total solids contained in a liquid, (e.g., wort). |
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© 2008
Siebel Institute of Technology - America's Oldest Brewing School