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The Hefty OneZip sliding tab sealable bag, formerly known as the "rolling-action zipper profile and slipper", was created by Eric A. St. Phillips and F. John Harrington Jr. at Mobil in the early 1990s at a cost of $25 to $50 million, after having developed and evaluated various different zipper designs, and finally deciding to roll out the "boxcar-shaped version", which slides over dual ...
The new water-soluble blocks improve the cleaning of the pipes which helps to reduce odor. Some recent formulations also include bacterial spores which, coupled with the surfactant cleaning power, can more completely get rid of odors and blockages caused by the buildup of solids in the traps and pipes.
The Lady and the Unicorn, a Flemish tapestry depicting the sense of smell, 1484–1500. Musée national du Moyen Âge, Paris.. Early scientific study of the sense of smell includes the extensive doctoral dissertation of Eleanor Gamble, published in 1898, which compared olfactory to other stimulus modalities, and implied that smell had a lower intensity discrimination.
Once the odorant has bound to the odor receptor, the receptor undergoes structural changes and it binds and activates the olfactory-type G protein on the inside of the olfactory receptor neuron. The G protein ( G olf and/or G s ) [ 10 ] in turn activates the lyase - adenylate cyclase - which converts ATP into cyclic AMP (cAMP).
In all industries, odor assessment is usually performed by human sensory analysis, by chemosensors, or by gas chromatography.The latter technique gives information about volatile organic compounds but the correlation between analytical results and mean odor perception is not direct due to potential interactions between several odorous components.
The odor detection threshold is the lowest concentration of a certain odor compound that is perceivable by the human sense of smell. The threshold of a chemical compound is determined in part by its shape, polarity, partial charges, and molecular mass. The olfactory mechanisms responsible for a compound's different detection threshold is not ...