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Low oxygen triggers moth molt

A new explanation for one of nature's most mysterious processes, the transformation of caterpillars into moths or butterflies, might best be described as breathless.

Biology / Plants & Animals

created Aug 22, 2011 | popularity 5 / 5 (2) | comments 0 | with audio podcast

First physical evidence of tobacco in a Mayan container

A scientist at Rensselaer Polytechnic Institute and an anthropologist from the University at Albany teamed up to use ultra-modern chemical analysis technology at Rensselaer to analyze ancient Mayan pottery ...

Other Sciences / Archaeology & Fossils

created Jan 11, 2012 | popularity 4.8 / 5 (5) | comments 0 | with audio podcast

Plant researchers locate transporter used for nicotine metabolism

The next time you take aspirin for a headache, thank a willow tree. Salicylic acid, a compound chemically similar to aspirin, is found in willow tree bark and is made by the plant as a chemical defense against pathogens. ...

Biology / Biotechnology

created Nov 01, 2011 | popularity 5 / 5 (1) | comments 0 | with audio podcast

When viruses infect bacteria

(PhysOrg.com) -- Viruses are the most abundant parasites on Earth. Well known viruses, such as the flu virus, attack human hosts, while viruses such as the tobacco mosaic virus infect plant hosts.

Biology / Cell & Microbiology

created Jun 30, 2011 | popularity 5 / 5 (3) | comments 0 | with audio podcast

Smoke-related chemical discovered in the atmosphere could have health implications

Cigarette smoking, forest fires and woodburning can release a chemical that may be at least partly responsible for human health problems related to smoke exposure, according to a new study by NOAA researchers ...

Space & Earth / Environment

created May 16, 2011 | popularity 5 / 5 (3) | comments 0 | with audio podcast

Titanate cigarette filter could be safer

(PhysOrg.com) -- While current cigarettes are made with a filter created from cellulose acetate which absorbs things like nicotine, tar, and polycyclic aromatic hydrocarbons, Chinese researchers have discovered ...

Nanotechnology / Nanomaterials

created May 04, 2011 | popularity 1.5 / 5 (4) | comments 17 | with audio podcast report

Lollipops with side effects: Plant's sugary offering betrays caterpillars to predatory ants

Trichomes, hair-like projections on leaves, are part of a plant's defense against herbivores: they can be obstacles, traps, or reservoirs for toxic substances. The hairs of wild tobacco Nicotiana attenuata ...

Biology / Plants & Animals

created Apr 25, 2011 | popularity 5 / 5 (1) | comments 0 | with audio podcast

Study finds oral tongue cancer increasing in young, white females

A UNC study released this week in the Journal of Clinical Oncology finds an increasing incidence of squamous cell carcinoma of the oral tongue in young white females in the United States over the last three decades.

Medicine & Health / Cancer

created Mar 08, 2011 | popularity 3 / 5 (5) | comments 7 | with audio podcast

Oral sex linked to cancer risk

US scientists said Sunday there is strong evidence linking oral sex to cancer, and urged more study of how human papillomaviruses may be to blame for a rise in oral cancer among white men.

Medicine & Health / Cancer

created Feb 20, 2011 | popularity 4.4 / 5 (24) | comments 14

Deterring signals: Tobacco plants advertise their defensive readiness to attacking leafhoppers

Following herbivory, plants produce jasmonic acid, a hormone which activates several plant defense reactions. Scientists found that leafhoppers can evaluate whether tobacco plants are ready for defense when attacked. If jasmonate-signaling ...

Biology / Biotechnology

created May 23, 2012 | popularity 5 / 5 (1) | comments 0

Science under fire from 'merchants of doubt': US historian

Scientists are facing an uphill battle to warn the public about pressing issues due to dissenters in their ranks who intentionally sow uncertainty, says a US historian.

Other Sciences / Other

created Mar 29, 2012 | popularity 3.8 / 5 (33) | comments 118

Fill 'er up with tobacco? Berkeley lab-led team explores new path to biofuels

(PhysOrg.com) -- Mention biofuels and most people think of corn ethanol. Some may think of advanced biofuels from switchgrass or miscanthus. But tobacco? Not likely.

Biology / Biotechnology

created Feb 24, 2012 | popularity 5 / 5 (3) | comments 1

Philippines pushes tobacco - for fish farming

The Philippines has launched a new campaign promoting tobacco -- not for smoking but for fish farming, a government tobacco agency official said Thursday.

Biology / Ecology

created Jan 19, 2012 | popularity 4 / 5 (2) | comments 0

Tests underway for new HIV drug farmed from GM tobacco plants

A clinical trial of a potential Human Immunodeficiency Virus (HIV) drug farmed from genetically modified (GM) tobacco plants has at long last got underway in the United Kingdom. The beginning of the trial ...

Biology / Biotechnology

created Aug 25, 2011 | popularity not rated yet | comments 0

Study of phytoremediation benefits of 86 indoor plants published

Formaldehyde is a major contaminant of indoor air, originating from particle board, carpet, window coverings, paper products, tobacco smoke, and other sources. Indoor volatile organic compounds (VOCs) such as formaldehyde ...

Biology / Plants & Animals

created Jun 23, 2011 | popularity 5 / 5 (1) | comments 0

Tobacco

Tobacco is an agricultural product processed from the fresh leaves of plants in the genus Nicotiana. It can be consumed, used as an organic pesticide, and in the form of nicotine tartrate it is used in some medicines. In consumption it most commonly appears in the forms of smoking, chewing, snuffing, or dipping tobacco, or snus. Tobacco has long been in use as an entheogen in the Americas. However, upon the arrival of Europeans in North America, it quickly became popularized as a trade item and as a recreational drug. This popularization led to the development of the southern economy of the United States until it gave way to cotton. Following the American Civil War, a change in demand and a change in labor force allowed for the development of the cigarette. This new product quickly led to the growth of tobacco companies until the scientific controversy of the mid-1900s.

There are many species of tobacco, which are all encompassed by the plant genus Nicotiana. The word nicotiana (as well as nicotine) was named in honor of Jean Nicot, French ambassador to Portugal, who in 1559 sent it as a medicine to the court of Catherine de Medici.

Because of the addictive properties of nicotine, tolerance and dependence develop. Absorption quantity, frequency, and speed of tobacco consumption are believed to be directly related to biological strength of nicotine dependence, addiction, and tolerance. The usage of tobacco is an activity that is practiced by some 1.1 billion people, and up to 1/3 of the adult population. The World Health Organization reports it to be the leading preventable cause of death worldwide and estimates that it currently causes 5.4 million deaths per year. Rates of smoking have leveled off or declined in developed countries, however they continue to rise in developing countries.

Tobacco is cultivated similar to other agricultural products. Seeds are sown in cold frames or hotbeds to prevent attacks from insects, and then transplanted into the fields. Tobacco is an annual crop, which is usually harvested in a large single-piece farm equipment. After harvest, tobacco is stored to allow for curing, which allow for the slow oxidation and degradation of carotenoids. This allows for the agricultural product to take on properties that are usually attributed to the "smoothness" of the smoke. Following this, tobacco is packed into its various forms of consumption which include smoking, chewing, sniffing, and so on.

For more information about Tobacco, read the full article at Wikipedia.
This text uses material from Wikipedia and is available under the GNU Free Documentation License.