| tobacco mosaic virus | <virology> Plant RNA virus, the first to be isolated. Consists of a single central strand of RNA (a helix of 6500 nucleotides) enclosed within a coat consisting of 2130 identical capsomeres that, in the absence of the RNA, will self assemble into a cylinder similar to the normal virus but of indeterminate length. Causes mottling of the leaves of the tobacco plant. (18 Nov 1997) |
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| tobacco mosaic virus replicase | <enzyme> Involved in resistance of plants to tmv; transgenic plants expressing additional insertion (an is10-like transposable element) in the tmv replicase gene are resistant to tmv Registry number: EC 2.7.7.- Synonym: tmv 183 kD replicase (26 Jun 1999) |
| tobacco mosaic virus satellite | A spherical RNA satellite virus which requires an obligatory rod-shaped helper tobacco mosaic virus for replication. (12 Dec 1998) |
| tobacco, smokeless | The powdered leaves of nicotiana tabacum which are either inhaled through the nose, chewed, or stored in cheek pouches. It includes any product of tobacco that is not smoked. (12 Dec 1998) |
| tobacco smoke pollution | Contamination of the air by tobacco smoke. (12 Dec 1998) |
| environmental tobacco smoke | A complex mixture of chemical constituents and particulates released into the atmosphere from the burning tip of a cigarette, pipe or cigar or from smoke exhaled by the smoker. (09 Oct 1997) |