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6 rezultati
A study of tobacco carcinogenesis. LI. Relative potencies of tobacco-specific N-nitrosamines as inducers of lung tumours in A/J mice.
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Tobacco-specific N-nitrosamines (TSNA) are formed from nicotine and the minor Nicotiana tabacum alkaloids during tobacco processing and tobacco smoking. The TSNA are the most abundant strong carcinogens in smokeless tobacco and in smoke. In this comparative study six TSNA and two major volatile
Expression of a constitutively active nitrate reductase variant in tobacco reduces tobacco-specific nitrosamine accumulation in cured leaves and cigarette smoke.
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Burley tobaccos (Nicotiana tabacum) display a nitrogen-use-deficiency phenotype that is associated with the accumulation of high levels of nitrate within the leaf, a trait correlated with production of a class of compounds referred to as tobacco-specific nitrosamines (TSNAs). Two TSNA species,
RNAi-mediated silencing of the HD-Zip gene HD20 in Nicotiana attenuata affects benzyl acetone emission from corollas via ABA levels and the expression of metabolic genes.
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BACKGROUND
The N. attenuata HD20 gene belongs to the homeodomain-leucine zipper (HD-Zip) type I family of transcription factors and it has been previously associated with the regulation of ABA accumulation in leaves and the emission of benzyl acetone (BA; 4-phenyl-2-butanone) from night flowers. In
A key enzyme for flavin synthesis is required for nitric oxide and reactive oxygen species production in disease resistance.
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Nitric oxide (NO) and reactive oxygen species (ROS) play key roles in plant immunity. However, the regulatory mechanisms of the production of these radicals are not fully understood. Hypersensitive response (HR) cell death requires the simultaneous and balanced production of NO and ROS. In this
The chemistry of defense and apparency in the corollas ofNicotiana attenuata.
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The morphological and chemical characteristics of flowers which attract pollinators present a dilemma for plants; advertising may increase the "apparency" of plants to their predators and some pollinators are also predators. We explore how a self-compatible disturbance species,Nicotiana attenuata,
The Swedish snus and the Sudanese toombak: are they different?
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In Sweden, snuff (locally known as snus), was introduced since the year 1637. Presently, Sweden has the highest per capita consumption and sale figures of snuff in the world, and the habit is becoming increasingly popular. Snus is manufactured into a dry form used in the nasal cavity and a moist
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