Analysis and Manipulation of the Structure of Odor Plumes from a Piezo-Electric Release System and Measurements of Upwind Flight of Male Almond Moths, Cadra cautella, to Pheromone Plumes

2007 ◽  
Vol 33 (10) ◽  
pp. 1927-1945 ◽  
Author(s):  
Robbie D. Girling ◽  
Ring T. Cardé
Keyword(s):  
Upwind Flight ◽  
Release System ◽  
Cadra Cautella ◽  
Odor Plumes ◽  
Pheromone Plumes ◽  
Piezo Electric

scholarly journals Flight behaviour of Cadra cautella males in rapidly pulsed pheromone plumes

2002 ◽  
Vol 27 (1) ◽  
pp. 58-66 ◽  
Author(s):  
Kristine A. Justus ◽  
Steven W. Schofield ◽  
John Murlis ◽  
Ring T. Carde
Keyword(s):  
Flight Behaviour ◽  
Cadra Cautella ◽  
Pheromone Plumes

Dynamic Properties of Antennal Responses to Pheromone in Two Moth Species

2005 ◽  
Vol 93 (4) ◽  
pp. 2233-2239 ◽  
Author(s):  
Kristine A. Justus ◽  
Ring T. Cardé ◽  
Andrew S. French
Keyword(s):  
Early Stage ◽  
Dynamic Properties ◽  
Dynamic Responses ◽  
Filter Model ◽  
Cadra Cautella ◽  
Concentration Changes ◽  
Dynamic Concentration ◽  
Moth Species ◽  
Pheromone Plumes ◽  
Antennal Responses

Dynamic properties of pheromone plumes are behaviorally important in some moths for inducing upwind flight, but little is known about the time-dependent properties of odor transduction or the mechanisms that limit receptor dynamic sensitivity. We stimulated male antennae of two moth species, Cadra cautella and Spodoptera exigua, with pheromone plumes in a wind tunnel while recording electroantennograms (EAG) and concentration of a surrogate plume (propylene, which mimics a pheromone plume) using a photoionization detector (PID). Turbulent plumes were produced by mechanical baffles, creating broad frequency range dynamic concentration changes at the antennae. Frequency response functions and coherence functions between PID and EAG signals were used to measure the dynamic responses of the two species to pheromone blends and individual components. A single time constant filter fitted the responses of both species, but S. exigua was about three times faster than C. cautella. Responses to individual pheromone components were significantly different in S. exigua but not in C. cautella. We also fitted the data with a simple block-structured nonlinear cascade. This supported the simple filter model but also suggested that the response saturates at an early stage of chemotransduction.

A Device for Magnification Measurement

1972 ◽  
Vol 30 ◽  
pp. 622-623
Author(s):  
J.A. Eades ◽  
A. van Dun
Keyword(s):  
Electron Microscope ◽  
Small Displacement ◽  
Private Communication ◽  
Piezoelectric Crystal ◽  
Double Exposure ◽  
Standard Methods ◽  
Elegant Method ◽  
The Right ◽  
Piezo Electric

The measurement of magnification in the electron microscope is always troublesome especially when a goniometer stage is in use, since there can be wide variations from calibrated values. One elegant method (L.M.Brown, private communication) of avoiding the difficulties of standard methods would be to fit a device which displaces the specimen a small but known distance and recording the displacement by a double exposure. Such a device would obviate the need for changing the specimen and guarantee that the magnification was measured under precisely the conditions used.Such a small displacement could be produced by any suitable transducer mounted in one of the specimen translation mechanisms. In the present case a piezoelectric crystal was used. Modern synthetic piezo electric ceramics readily give reproducible displacements in the right range for quite modest voltages (for example: Joyce and Wilson, 1969).

Subnose-1. electrochemical tracking of odor plumes at 900 m beneath the ocean surface

1991 ◽  
Vol 75 ◽  
pp. 303-306
Author(s):  
J Atema ◽  
PA Moore ◽  
LP Madin ◽  
GA Gerhardt
Keyword(s):  
Ocean Surface ◽  
Odor Plumes

Resonant-type MEMS Magnetic Sensor with FePd Magneto-strictive and PZT Piezo-electric Films

2019 ◽  
Vol 139 (11) ◽  
pp. 383-384
Author(s):  
Naoki Okada ◽  
Koudai Suzuki ◽  
Takashi Mineta
Keyword(s):  
Magnetic Sensor ◽  
Piezo Electric

Reducing the Risk in Controlled Drug Release by Using Tannic Acid in Liposomal Formulations

2018 ◽  
Vol 68 (12) ◽  
pp. 2925-2918
Author(s):  
Gabriela Cioca ◽  
Maricel Agop ◽  
Marcel Popa ◽  
Simona Bungau ◽  
Irina Butuc
Keyword(s):  
Drug Release ◽  
Tannic Acid ◽  
Release Rate ◽  
Controlled Drug Release ◽  
Toxicity Threshold ◽  
Release System ◽  
Liposomal Formulations ◽  
Cross Linker ◽  
Natural Cross

One of the main challenges in designing a release system is the possibility to control the release rate in order to maintain it at a constant value below a defined limit, to avoid exceeding the toxicity threshold. We propose a method of overcoming this difficulty by introducing the drug into liposomes, prior to its inclusion in the hydrogel. Furthermore, a natural cross linker (as is tannic acid) is used, instead of the toxic cross linkers commonly used, thus reducing the toxicity of the release system as a whole.

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