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Olfaction, the sense of odor (smell), is the detection of chemicals dissolved in air (or in water, by animals that live under water). In vertebrates smells are sensed by the olfactory epithelium located in the nasal cavity and first processed by the olfactory bulb in the olfactory system. In insects smells are sensed by sensilla located on the antenna and first processed by the antennal lobe.
How olfaction works
Receptors
As discovered by Linda B. Buck and Richard Axel (who were awarded the Nobel Prize in 2004), mammals generally have about 1000 genes for odor receptors. Of these genes, only a portion code for functional odor receptors. Humans have 347 functional odor receptor genes; the other genes have nonsense mutations. This number was determined by analyzing the genome in the Human Genome Project; the number may vary among ethnic groups, and does vary among individuals. For example, not all people can smell androstenone, a component of male sweat.Each olfactory receptor neuron in the nose expresses only one functional odor receptor. Odor receptor nerve cells may function like a key-lock system: if the odor molecules can fit into the lock the nerve cell will respond. According to shape theory, each receptor detects a feature of the odor molecule. Weak-shape theory, known as odotope theory, suggests that different receptors detect only small pieces of molecules, and these minimal inputs are combined to create a larger olfactory perception (similar to the way visual perception is built up of smaller, information-poor sensations, combined and refined to create a detailed overall perception). An alternative theory, the vibration theory proposed by Luca Turin (1996, 2002), posits that odor receptors detect the frequencies of vibrations of odor molecules in the infrared range by electron tunnelling. However, the behavioral predictions of this theory have been found lacking (Keller and Vosshall, 2004).
More on [ Olfaction ]
Deer Hunting: Deer Lures and Scents: Hunting and Fishing Sponsors. Latest Outdoors Headlines. Deer Hunting: Deer Lu... http://bit.ly/6LhNea
justgofishin (JustGoFishin.com) Wed, 16 Dec 2009 22:58:06 -0000
Deer Hunting: Deer Lures and Scents: Hunting and Fishing Sponsors. Latest Outdoors Headlines. Deer Hunting: Deer Lu... http://bit.ly/6LhNea
Feed - Offering a assortment of lures, knives, and accessories.
Meta Description: [ Whitetail Supply & Feed, for quality parts service & supply, stop by and give us a try. We are your #1 source for quality game camera accessories, Leading Game camera sales, Deer Feed, Food Plots, Minerals, Archery, Equipment, Offering a huge selection of custom IR fabrications with the hunter i... ]
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Buck Bait - Offering a hunting lure for deer, moose, elk bear. Easy to use. Offers a toll free number and printable order form.
Meta Description: [ Buck Bait has the best big-game sucker/deer attractant on the market. ]
Buck Magic - Offering deer attractants that have a patent. Also provides testimonials and Facts and Questions.
Buck Stop Lure Co. - Offering the Buck Stop hunting lures and attractants for hunting deer. Also offers on-line ordering.
Meta Description: [ Buck Stop Scents and Lures : Attractants and Accessories for Hunting ]
Bucks N Does - Human scent eliminators and information on these products. Also offers testimonials.
Meta Description: [ The ultimate advantage human scent elimination products for hunters and wildlife photographers. Designed for hunters and wildlife photographers. ]
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Buckstuds - Offering the latest innovation in the attractant industry for applying deer scents. Also offers online ordering.
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Deer Quest - Offering deer scents for hunting environments.
Docs Deer Scents - Offering deer scents and lure's for big game hunters. Also has printable orderform.
Meta Description: [ Doc's Deer Scents introduces not only by far the largest Urine Scent Collection/Manufacturing Facility in the world today, but also more importantly the most technologically advanced state of the art urine production facility ever constructed. ]
Foggy Mountain Lures and Scents - Scents and lures in 8-ounce bottles. Also offers testimonials.
Harmon Deer Scents - Deer scents and lures.
Meta Description: [ Harmon Deer Scent has over 33 Premium Deer Scents and lures to attract that Big Buck - also Deer Feeders, Grunt Calls, Cover scents, and Rattling Bags. Serving hunters since 1985. ]
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Hawgs Limited - Offering scent eliminating sprays, urine and gland deer formula synthetic scents. Also offers hunting tips and stories from fellow hunters.
Head Hunter Scents - Hunting scent and masking products for the discriminating hunter.
Meta Description: [ Head Hunter Scents ]
Hunters Edge - Offers a scent controlling, moisture adsorbing formula for hunters.
Kishel's - Offers hunting scents, animal urine and trapping lures, and bait.
Meta Description: [ We offer Result Proven Deer Scents, Hunting Lure and Trapping Lures for Big Game Hunters, Trappers, Predator Callers and Photographers.
We have scents for Hunting Deer, Elk, Moose, Bear, Wild Boar, and Black Tail ]
KISScents Deer Scents - Sales of scents and information on when and why to use them. Has articles on scent use and common mistakes.
Meta Description: [ KISScents - Keep It Simple Scents. We show you how, when and why to use scents. Site has articles on scent use and common mistakes, rut reference guides with rut dates for each state, KISScents hunting calendars, Flash Cans reflective scent containers. Special online offers include free video... ]
Lowe's Whitetail - Offering deer scents and lures.
Meta Description: [ Lowe's Whitetail Deer, maker of deer scents and deer lures. ]
Nature's Essence, Inc. - Offering cover scent and scent eliminators.
Nature's Own Shop - Natural buck scented candle brings the deer to you.
Meta Description: [ This is a web site for Hunting and Fishing. It offers Buck Lure Candle and a Photo Album that you can keep track of where you got that Big Buck or Big Fish or what ever game you go after.
Please keep this a family site!! No Bad words or grapics PLEASE ]
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The Buck Magnet - Offering a programmable deer scent dispenser.
Whitetail Products - Offering deer scents and lures for the hunter.
Meta Description: [ Whitetail.Com : - Hunting Fishing Other ecommerce, open source, shop, online shopping ]
Wildlife Buffet - Offering a diverse line of wildlife management products.
Meta Description: [ Deer food plots and more! Trophy whitetails require critical whitetail nutrition, whitetail genetics and maturity.
Wildlife Buffet focuses on developing food plots and nutritional supplements for whitetails to
help produce healthy and trophy deer. Trohphy Bucks are not accidents! ]
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