| tobacco | 1. <botany> An American plant (Nicotiana Tabacum) of the Nightshade family, much used for smoking and chewing, and as snuff. As a medicine, it is narcotic, emetic, and cathartic. Tobacco has a strong, peculiar smell, and an acrid taste. The name is extended to other species of the genus, and to some unrelated plants, as Indian tobacco (Nicotiana rustica, and also Lobelia inflata), mountain tobacco (Arnica montana), and Shiraz tobacco (Nicotiana Persica). 2. The leaves of the plant prepared for smoking, chewing, etc, by being dried, cured, and manufactured in various ways. <chemistry> Tobacco box See Nicotianine. Tobacco man, a tobacconist. Tobacco pipe. A pipe used for smoking, made of baked clay, wood, or other material. <botany> The larva of a large hawk moth (Sphinx, or Phlegethontius, Carolina). It is dark green, with seven oblique white stripes bordered above with dark brown on each side of the body. It feeds upon the leaves of tobacco and tomato plants, and is often very injurious to the tobacco crop. Origin: Sp. Tabaco, fr. The Indian tabaco the tube or pipe in which the Indians or Caribbees smoked this plant. Some derive the word from Tabaco, a province of Yucatan, where it was said to be first found by the Spaniards; others from the island of Tobago, one of the Caribbees. But these derivations are very doubtful. Source: Websters Dictionary (01 Mar 1998) |
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| tobacco anionic peroxidase | <enzyme> Has been shown to oxidise a number of significant plant secondary cpds in vitro; from nicotiana tabacum; expressed in highest level in lignifying and epidermal tissue; aa sequence known; genbank l02124 Registry number: EC 1.11.1.- (26 Jun 1999) |
| tobacco heart | Cardiac irritability marked by irregular action, palpitation, and sometimes pain, believed to occur as a result of the excessive use of tobacco. (05 Mar 2000) |
| tobacco industry | The aggregate business enterprise of agriculture, manufacture, and distribution related to tobacco and tobacco-derived products. (12 Dec 1998) |
| 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) |
| 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 smoke pollution | Contamination of the air by tobacco smoke. (12 Dec 1998) |
| tobacco use disorder | Tobacco used to the detriment of a person's health or social functioning. Tobacco dependence is included. (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) |
| tobamovirus | A genus of plant viruses in which the virion is a rigid filament. Transmission is by mechanical inoculation or seed. The type species is tobacco mosaic virus. (12 Dec 1998) |
| Tobia fever | <infectious disease> An acute febrile (feverish) disease initially recognised in the Rocky Mountain states, caused by Rickettsia rickettsii transmitted by hard-shelled (ixodid) ticks. Occurs only in the Western Hemisphere. The disease is characterised by sudden onset of headache, chills and fever which can persist for 2-3 weeks, muscle pain. A characteristic rash appears on the extremities and trunk about the 4th day of illness. The rickettsiae grow within damaged cells lining blood vessels which may become blocked by clots. Blood vessel inflammation (vasculitis) is widespread Early recognition of the condition and prompt antibiotic treatment is important in reducing mortality. Synonym: spotted fever, tick fever, and tick typhus. (25 Jun 1999) |
| tobias fish | <zoology> The lant, or sand eel. See: the Note under Asmodeus, in the Dictionary of Noted Names in Fiction. Source: Websters Dictionary (01 Mar 1998) |
| tobramycin | <chemical> O-3-amino-3-deoxy-alpha-d-glucopyranosyl-(1-4)-o-(2,6- diamino-2,3,6-trideoxy-alpha-d-ribohexopyranosyl-(1-4))-2- deoxy-d-streptamine. An aminoglycoside, broad-spectrum antibiotic produced by streptomyces tenebrarius. It is effective against gram-negative bacteria, especially the pseudomonas species. It is a 10% component of the antibiotic complex, nebramycin, produced by the same species. Pharmacological action: antibiotics, aminoglycoside. Chemical name: D-Streptamine, O-3-amino-3-deoxy-alpha-D-glucopyranosyl-(1-6)-O-(2,6-diamino-2,3,6-trideoxy-alpha-D-ribo-hexopyranosyl-(1-4))-2-deoxy- (12 Dec 1998) |
| tobramycin adenylyltransferase | <enzyme> Substrate aminoglycosides may be replaced by specific antibiotic Registry number: EC 2.7.7.- Synonym: aminoglycoside 4'-adenylyltransferase, aminocyclitol adenylyltransferase, aminoglycoside 4,4"-adenylyltransferase, 4,4''-aminoglycoside nucleotidyltransferase (26 Jun 1999) |