The Experts below are selected from a list of 252 Experts worldwide ranked by ideXlab platform
Scott E Lukas - One of the best experts on this subject based on the ideXlab platform.
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improved low cost mr compatible Olfactometer to deliver tobacco smoke odor
Behavior Research Methods, 2017Co-Authors: Steven B Lowen, Stacey L Farmer, Scott E LukasAbstract:We describe a low-cost, MRI-compatible Olfactometer that delivers fresh cigarette smoke odor, a challenging odorant to present, as well as other odorants. This new Olfactometer retains all of the advantages of an earlier design that was capable of only delivering volatile odors (Lowen & Lukas, Behavior Research Methods, 38, 307–313, 2006). The new system incorporates a novel switching mechanism that allows it to deliver fresh smoke generated from a burning cigarette during a stimulus presentation paradigm that might be employed in a cue-reactivity experiment. An evaluation study established that the Olfactometer reliably delivered smoke to the participants and that tobacco smoke was discriminated from other odorants; there were no adverse reactions to the device.
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a low cost mr compatible Olfactometer
Behavior Research Methods, 2006Co-Authors: Steven B Lowen, Scott E LukasAbstract:We present a design for an Olfactometer, suitable for fMRI experiments, that can be constructed at extremely low cost. The Olfactometer presents odors directly to the nose via a nasal cannula at unobtrusively low flow velocities, with no large assemblies required on or near the subject’s face. The Olfactometer can be controlled manually, or by computer via a serial interface. A validation study verified that the Olfactometer reliably presents odors to test subjects. Errors and response latency times decreased with increased flow rate in an orderly manner, as expected.
M P Parrella - One of the best experts on this subject based on the ideXlab platform.
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quantitative assessment of insect Olfactometer performance by experimental flow analysis
Biological Control, 1996Co-Authors: D K Giles, Kevin M Heinz, M P ParrellaAbstract:Abstract Biocontrol organisms respond to olfactory cues with behavior which can affect their efficacy as pest control agents. Investigations into olfactory stimuli and responses often use four-armed Olfactometers for laboratory experiments. Performance evaluations of the Olfactometers have generally been qualitative and based on visual assessment. A quantitative technique for characterizing the air flow and gas mixing in a four-armed Olfactometer was developed. Ethylene gas was injected into the flow stream for each channel of the Olfactometer. Samples of air at various locations in the Olfactometer chamber were drawn through hypodermic probes and the concentration of ethylene in the samples were determined by gas chromatography. Flow boundaries between adjacent channels were not distinct and mixing between channels was observed, although concentration spatial gradients were high in the boundary regions. Mixing increased as flow neared a central outlet. Gross assessments of organism behavior in Olfactometers appear valid in spite of flow mixing.
Steven B Lowen - One of the best experts on this subject based on the ideXlab platform.
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improved low cost mr compatible Olfactometer to deliver tobacco smoke odor
Behavior Research Methods, 2017Co-Authors: Steven B Lowen, Stacey L Farmer, Scott E LukasAbstract:We describe a low-cost, MRI-compatible Olfactometer that delivers fresh cigarette smoke odor, a challenging odorant to present, as well as other odorants. This new Olfactometer retains all of the advantages of an earlier design that was capable of only delivering volatile odors (Lowen & Lukas, Behavior Research Methods, 38, 307–313, 2006). The new system incorporates a novel switching mechanism that allows it to deliver fresh smoke generated from a burning cigarette during a stimulus presentation paradigm that might be employed in a cue-reactivity experiment. An evaluation study established that the Olfactometer reliably delivered smoke to the participants and that tobacco smoke was discriminated from other odorants; there were no adverse reactions to the device.
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a low cost mr compatible Olfactometer
Behavior Research Methods, 2006Co-Authors: Steven B Lowen, Scott E LukasAbstract:We present a design for an Olfactometer, suitable for fMRI experiments, that can be constructed at extremely low cost. The Olfactometer presents odors directly to the nose via a nasal cannula at unobtrusively low flow velocities, with no large assemblies required on or near the subject’s face. The Olfactometer can be controlled manually, or by computer via a serial interface. A validation study verified that the Olfactometer reliably presents odors to test subjects. Errors and response latency times decreased with increased flow rate in an orderly manner, as expected.
Terry E. Acree - One of the best experts on this subject based on the ideXlab platform.
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a gas chromatograph pedestal Olfactometer gc po for the study of odor mixtures
Chemosensory Perception, 2009Co-Authors: Robert C. Williams, Fanny Parisot, Emeline Sartre, Anne J. Kurtz, Terry E. AcreeAbstract:Gas chromatography – Olfactometry (GC-O) purifies odorants and delivers them as 1 to 2 second doses to an Olfactometer where their odor properties (quale and intensity) can be studied independent of other odors. Adding an odor to the Olfactometer air before combining it with the GC effluent creates an odor pedestal upon which an odorant eluting from the GC can be studied to provide insight into mixture perception. This paper describes the development and testing of a gas chromatography - pedestal Olfactometer (GC-PO) that produces a Gaussian shaped distribution of one odorant in a background of constant odor composition (the pedestal).
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A gas chromatograph-pedestal Olfactometer (GC-PO) for the study of odor mixtures
Chemosensory Perception, 2009Co-Authors: Robert C. Williams, Fanny Parisot, Emeline Sartre, Anne J. Kurtz, Terry E. AcreeAbstract:Gas chromatography - Olfactometry (GC-O) purifies odorants and delivers them as 1 to 2 second doses to an Olfactometer where their odor properties (quale and intensity) can be studied independent of other odors. Adding an odor to the Olfactometer air before combining it with the GC effluent creates an odor pedestal upon which an odorant eluting from the GC can be studied to provide insight into mixture perception. This paper describes the development and testing of a gas chromatography - pedestal Olfactometer (GC-PO) that produces a Gaussian shaped distribution of one odorant in a background of constant odor composition (the pedestal). A constant pedestal composition was generated by a dynamic headspace released from poly(ethylene) glycol (PEG) solutions into the humidified air of a gas chromatograph-Olfactometer (GCO). A magnetic stirrer kept the solvent at the interface in equilibrium with the remainder of the solution producing a constant (+ 10%) pedestal concentration. The resulting pedestal was then combined with a GC effluent and sent to the sniff port of the GC-O. Hexanal, octanal and decanal were analyzed by gas chromatography-mass spectrometry to test the performance and stability of the pedestal. Volatile concentrations of compounds released in the pedestal of GC-PO were linear, constant and could be turned on and off without any detectable background or residual odor.
D K Giles - One of the best experts on this subject based on the ideXlab platform.
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quantitative assessment of insect Olfactometer performance by experimental flow analysis
Biological Control, 1996Co-Authors: D K Giles, Kevin M Heinz, M P ParrellaAbstract:Abstract Biocontrol organisms respond to olfactory cues with behavior which can affect their efficacy as pest control agents. Investigations into olfactory stimuli and responses often use four-armed Olfactometers for laboratory experiments. Performance evaluations of the Olfactometers have generally been qualitative and based on visual assessment. A quantitative technique for characterizing the air flow and gas mixing in a four-armed Olfactometer was developed. Ethylene gas was injected into the flow stream for each channel of the Olfactometer. Samples of air at various locations in the Olfactometer chamber were drawn through hypodermic probes and the concentration of ethylene in the samples were determined by gas chromatography. Flow boundaries between adjacent channels were not distinct and mixing between channels was observed, although concentration spatial gradients were high in the boundary regions. Mixing increased as flow neared a central outlet. Gross assessments of organism behavior in Olfactometers appear valid in spite of flow mixing.
