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| datura_wrightii_regel [2015/06/13 09:38] – Externe Bearbeitung 127.0.0.1 | datura_wrightii_regel [2016/05/07 08:42] (aktuell) – andreas |
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| "Although the floral scent of D. wrightii comprises at least 60 compounds, only nine of those elicited robust neural responses. Behavioral experiments confirmed that these nine odorants mediate flower-foraging behaviors, but only as a mixture. Moreover, the mixture evoked equivalent foraging behaviors over a 1000-fold range in dilution, suggesting a singular percept across this concentration range. Furthermore, neural-ensemble recordings in the moth's antennal lobe revealed that reliable encoding of the floral mixture is organized through synchronized activity distributed across a population of glomerular coding units, and this timing mechanism may bind the features of a complex stimulus into a coherent odor percept... The D. wrightii flower produces a chemically diverse fragrant scent containing: monoterpenoids (MO) such as trans-β-ocimene and geraniol; aromatics (AR) like benzyl alcohol and benzaldehyde; sesquiterpenoids (SE) including E-caryophyllene and α-farnesene; aliphatics (AP) such as cis-3-hexen-1-ol and 2-hexanone... An analysis of population-level responses demonstrated strong ensemble selectivity for a group of nine odorants. To examine odorant-evoked responses between preparations (n = 16), we calculated the percentage of excited units (response index [RI] ≥ 2.0) in each ensemble for each odorant (Figure 1D). This analysis confirmed that many units were activated by one or more members of this same group of nine odorants: benzaldehyde (bea), benzyl alcohol (bol), linalool (lin), nerol (ner), β-myrcene (myr), methyl salicylate (mal), geraniol (ger), E-caryophyllene (car), and α-farnesene (far) (odorants 23–31, respectively). The remaining odorants evoked little or no activity in most units." \\ | "Although the floral scent of D. wrightii comprises at least 60 compounds, only nine of those elicited robust neural responses. Behavioral experiments confirmed that these nine odorants mediate flower-foraging behaviors, but only as a mixture. Moreover, the mixture evoked equivalent foraging behaviors over a 1000-fold range in dilution, suggesting a singular percept across this concentration range. Furthermore, neural-ensemble recordings in the moth's antennal lobe revealed that reliable encoding of the floral mixture is organized through synchronized activity distributed across a population of glomerular coding units, and this timing mechanism may bind the features of a complex stimulus into a coherent odor percept... The D. wrightii flower produces a chemically diverse fragrant scent containing: monoterpenoids (MO) such as trans-β-ocimene and geraniol; aromatics (AR) like benzyl alcohol and benzaldehyde; sesquiterpenoids (SE) including E-caryophyllene and α-farnesene; aliphatics (AP) such as cis-3-hexen-1-ol and 2-hexanone... An analysis of population-level responses demonstrated strong ensemble selectivity for a group of nine odorants. To examine odorant-evoked responses between preparations (n = 16), we calculated the percentage of excited units (response index [RI] ≥ 2.0) in each ensemble for each odorant (Figure 1D). This analysis confirmed that many units were activated by one or more members of this same group of nine odorants: benzaldehyde (bea), benzyl alcohol (bol), linalool (lin), nerol (ner), β-myrcene (myr), methyl salicylate (mal), geraniol (ger), E-caryophyllene (car), and α-farnesene (far) (odorants 23–31, respectively). The remaining odorants evoked little or no activity in most units." \\ |
| [Riffell, J. A., Lei, H., Christensen, T. A., Hildebrand, J. G., Characterization and coding of behaviorally significant odor mixtures. Current Biology, Vol.19(4), 2009, 335-340] [[http://www.sciencedirect.com/science/article/pii/S0960982209006137]] | [Riffell, J. A., Lei, H., Christensen, T. A., Hildebrand, J. G., Characterization and coding of behaviorally significant odor mixtures. Current Biology, Vol.19(4), 2009, 335-340] [[http://www.sciencedirect.com/science/article/pii/S0960982209006137]] |
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| | {{:datura_wrightii.jpg|}} \\ |
| | Datura wrightii [[https://commons.wikimedia.org/wiki/File:CACH-Sacred_Datura_4bd6a3dda41e413abf6a86f91c73dd18.jpg?uselang=de|Wikimedia Commons]] (copyright = public domain) |
