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Topic: Chemosensor

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In the News (Thu 20 Jun 19)

  group research   (Site not responding. Last check: 2007-10-20)
A chemosensor is a molecule capable of transforming chemical information, such as the presence of a particular metal ion, into an analytically useful signal.
A metal-ion chemosensor comprises a metal recognition and a signal-transduction domain that is triggered upon ion binding.
Current projects are the extension of the coumarin family of chemosensors, the development of novel chromophore classes, and the further definition of the nature of the vesicles containing imageable zinc.
web.uconn.edu /chemistry/bruckner/seiten/researchchemo.html   (1130 words)

 Development of chemosensors for iron(III) and zinc(II)
A Chemosensor is a molecule which can translate the presence of a sample component into a measurable signal, here fluorescence.
It is shown that the mechanism of operation of this sensor is the Fe(III)-specific release of a fluorescent molecule from the non-fluorescent sensor.
Part B of this thesis describes the synthesis of a coumarin-based chemosensor suitable for the imaging of Zn(II) in live cells.
digitalcommons.uconn.edu /dissertations/AAI3138391   (238 words)

 [No title]
Chemosensor is a molecule that reacts reversibly with a chemical analyte and gives a measurable signal in responce.
The simplest fluorescent chemosensors are based on aromatic groups such as anthryl ones linked to amino groups.
Fluorescent chemosensors are high sensitive, and this properties allow the researchers to use small concentration of them.
www.immt.pwr.wroc.pl /sgm2001/Abstrcts/Kledzik.doc   (236 words)

 An overview of the sensory receptors regulating cough | Cough, Volume 1 - Mirror @ Uni Potsdam
Airway chemosensors are derived from both the nodose and jugular vagal ganglia, as well as from the dorsal root ganglia [13-15].
These conflicting observations have lead to suggestions that in conscious animals cough-evoked by chemosensor stimuli relies on cortical processing of the stimulus, in which the activation of a subset of airway chemosensors generate the conscious perception of airway irritation and promote the urge to cough [3].
Chemosensor-evoked potentiation of cough may reflect convergence of cough receptors and chemosensors onto common brainstem neurons responsible for generating cough [14,22], and shares many similarities with the interaction between cutaneous mechanosensors and chemosensors in the spinal cord, which is thought to underlie the manifestation of aberrant pain states [Reviewed in 22, 63].
bmc.ub.uni-potsdam.de /1745-9974-1-2/text.htm   (5005 words)

 [No title]   (Site not responding. Last check: 2007-10-20)
If the chemosensor is in solution, the method comprises: contacting a sample with the chemosensor to form a test solution, irradiating the test solution at a wavelength sufficient to excite the fluorophore, measuring the fluorescence emission of the test solution, and determining the concentration of metal in said sample based on said fluorescence emission.
The first embodiment of the chemosensor is described in detail below and demonstrates the feasibility of exploiting metal-dependent structure modulation as the basis for trace analyte detection.
A device comprising: the chemosensor of Claim 1 immobilized onto a solid support, a means for irradiating the chemosensor, and a means for detecting the fluorescence emission of said chemosensor.
www.wipo.int /cgi-pct/guest/getbykey5?KEY=97/35182.980716&ELEMENT_SET=DECL   (5030 words)

 Jimmy McCloskey 2003-2004   (Site not responding. Last check: 2007-10-20)
Cues from “distant” sources are sampled using olfaction chemosensors called aesthetascs on the antennules.
The arrangement and shape of these chemosensors affect how much odor-containing fluid is able to penetrate close to the antennules during odor sampling.
This study hypothesizes that olfactory chemosensor structure may change as a function of animal size and gender.
www.denison.edu /biology/majors/seniorresearch2004/JMcCloskey.html   (143 words)

 CSM Research: Photonic Sensing Materials (IRG1)
We have succeeded in coupling the disparate methods of supramolecular chemosensing and microfluidics to create a novel supramolecular microfluidic optical chemosensor (µFOC).
A micromolded serpentine channel has been patterned with sol-gel or polymer films that incorporate a lanthanide-modified cyclodextrin supramolecule.
These results demonstrate that the most intricate signal transduction mechanisms of supramolecular optical chemosensors are preserved in µF environments, pointing the way to a new avenue of exploration for the development of optical chemosensing devices.
www.pa.msu.edu /csm/research/nocera/nocera_chemosensor.html   (131 words)

 AMOTH   (Site not responding. Last check: 2007-10-20)
Apart of serving the onboard sensor, the board has a connector with 2 additional analog inputs that allow for the integration of additional sensors, e.g.
The two chemosensor boards mounted on the indoor UAV.
The chemosensors are connected to the UAV's main board which transmits the data wireless to a laptop ground station.
www.amoth.le.ac.uk /amoth/about_uav.htm   (235 words)

 AMOTH   (Site not responding. Last check: 2007-10-20)
Contrast this to the main olfactory system and EN systems which deploy broadly tuned chemosensors across a large population.
That is not to say that the biological solution we see is here the only strategy to solving the specific odour coding problem, but that it is likely to be an effective one.
There, action potentials are triggered that travel down the ORN axon into the AL the primary olfactory centre of the moth brain.
www.amoth.le.ac.uk /amoth/about_chemo.htm   (822 words)

 [No title]
A fluorescent chemosensor based on a small molecule that complexes a metal ion reversibly but selectively, with concomitant fluoresence signal transduction is therefore desirable and worthwhile.
PROJECT DESCRIPTION Title: Peptide Based Macrocycles as Chemosensors for Metal Ions C1: Specific Aims The long term goal of this project is to design chemosensing molecules that bind metal ions and signal specific metal ion binding.
C2: Background and Significance Chemosensors are small molecules of abiotic origin that signal the presence of analytes [1].
media.wiley.com /assets/165/98/jb_blackburn_nsf_rui.doc   (3811 words)

 International Union of Pure and Applied Chemistry
For fluorescence chemosensors, fluorescence energy transport between polymers as well as through a polymer backbone must be optimized to realize high sensitivity.
Besides the sensitivity studies, the effect of receptor design on the selectivity of a potassium chemosensor was investigated.
By analyzing the effect of the side group bulk on every other repeating unit to the sensitivity, we have shown that the detection mechanism is co-facial interpolymer aggregation induced by potassium binding.
www.iupac.org /news/prize/2002/kim.html   (1166 words)

 Neurophysiological studies on central chemosensor in medullary ventrolateral areas -- Pokorski 230 (5): 1288 -- AJP - ...
Neurophysiological studies on central chemosensor in medullary ventrolateral areas -- Pokorski 230 (5): 1288 -- AJP - Legacy
Neurophysiological studies on central chemosensor in medullary ventrolateral areas
It is possible that the chemosensitive cells found may be part of the central chemosensor.
ajplegacy.physiology.org /cgi/content/abstract/230/5/1288   (192 words)

 ABSTRACT   (Site not responding. Last check: 2007-10-20)
Chemosensor Array for Detecting the Proliferation of Weapons of Mass Destruction--Intelligent Optical Systems, Inc., 2520 W. 237th St., Torrance, CA 90505-5217; 310-530-7130
The system will be designed to achieve unmatched detection speed, reversibility, accuracy, and sensitivity for detecting the chemical signatures of terrorist weapons.
It will integrate four breakthrough technologies: (1) fiber optic long period grating; (2) chemical indicators having affinity for nerve agents, explosives and their precursors; (3) an array of chemosensors; and (4) a proprietary signal processor.
www.er.doe.gov /sbir/awards_abstracts/sbir/cycle17/phase1/193.htm   (217 words)

 87   (Site not responding. Last check: 2007-10-20)
Chemosensor Array for Detecting the Proliferation of Weapons of Mass Destruction--Intelligent Optical Systems, Inc., 2520 West 237th Street, Torrance, CA 90505-5217; 310-530-7130
Optical evanescent wave chemical sensors are being considered by NN for detecting and characterizing signature molecules related to weapons of mass destruction.
This project will develop innovative chemosensor arrays and utilize neural net signal processing algorithms to substantially improve the performance of these sensors.
www.er.doe.gov /sbir/awards_abstracts/sbir/cycle17/phase2/87.htm   (202 words)

 Sensors for Medicine and Science, Inc. - Oxygen Sensors and Glucose Sensors
Important Note: These are the articles that use the phrase "fluorescent chemosensor" in the title or abstract.
There are many articles dealing with this subject that are not included in this list, simply because they do not include the phrase "fluorescent chemosensor" and therefore do not appear under this search.
If the reader has citations they would like to have listed in this bibliography, please format them in the same way shown below and send the file to admin@s4ms.com.
www.s4ms.com /chem_chemosensor.htm   (121 words)

 Optical Chemosensors   (Site not responding. Last check: 2007-10-20)
For physical sensing the analyte is not in equilibrium; it is trapped in the recognition site — thus the light signal is always on [8,9].
While this makes for a dreadful chemosensor, it is wonderful physical sensor of phenomena that occur on very large length scales.
The intricate requirements for “3R” chemosensing are preserved on the patterned µF device, thus allowing us to construct the first microfluidic optical chemosensor (µFOC) [10].
web.mit.edu /chemistry/dgn/www/research/chemosensors.html   (1839 words)

 Microscopic Metal Detection
Bradshaw holds a beaker of clear methanol solution that contains the team's chemosensor for cadmium but no cadmium ions, then blasts the solution with fl light.
But when a drop of cadmium is added, it glows bright blue and swirls in the clear solution as the chemosensors bind to the ions and the reporters fluoresce.
The designer chemosensors, one for each metal the team is studying, fluoresce a specific color if the corresponding metal ions are present in the solution.
magazine.byu.edu /g/viewarticle.php?a=785   (1078 words)

 A Supramolecular Microfluidic Optical Chemosensor   (Site not responding. Last check: 2007-10-20)
Bright emission from the Tb ion is observed upon exposure of the
The signal transduction mechanism was elucidated by undertaking steady-state and time-resolved spectroscopic measurements directly on the optical chemosensor patterned within the microfluidic network.
These results demonstrate that the intricate signal transduction mechanisms of supramolecular optical chemosensors are successfully preserved in microfluidic environments.
pubs.acs.org /cgi-bin/abstract.cgi/jacsat/2002/124/i08/abs/ja010176g.html   (139 words)

 Publications — Department of Chemistry and Biochemistry
Efficient immobilization of a cadmium chemosensor in a thin film: generation of a cadmium sensor prototype.
Characterization of bis-8-hydroxyquinoline-armed diazatrithia-16-crown-5 and diazadibenzo-18-crown-6 ligands as fluorescent chemosensor for zinc.
Characterization of 5-methoxyquinoline appended diaza-18-crown-6 as a chemosensor for cadmium.
www.chem.byu.edu /Plone/people/pbsavage/publications.html   (2334 words)

 Inter Research » MEPS » v261 » p217-231
Cephalic chemosensor deafferentation decreased search success, reduced walking speed and increased the duration of stationary periods.
All these deficiencies are manifestations of the inability of crabs to sustain upstream progress.
The differing functional roles of these 2 sets of appendages may be associated with different signal characteristics impinging on their chemosensor populations.
www.int-res.com /abstracts/meps/v261/p217-231   (377 words)

 Weill Cornell Research
In contrast, sAC is directly regulated by bicarbonate ions suggesting it functions as the physiological carbon dioxide chemosensor.
Additionally, as the only identified bicarbonate/carbon dioxide chemosensor in mammals, sAC may also be involved in fluid reabsorption in the kidney, fluid secretion in the ciliary bodies and choroid plexus, and metabolic regulation in response to nutritional signals.
We are currently testing these hypothesized physiological functions by making inducible, tissue-specific knockouts of the sAC gene in mice.
www.med.cornell.edu /research/jbuck   (337 words)

 Poster Abstracts   (Site not responding. Last check: 2007-10-20)
Two types of films were compared: one using a small-molecule crystalline donor/acceptor pair and the other using a donor-graft polymer/small-molecule acceptor pair.
Potential applications of this chemosensor are also discussed.
Silver nanoparticles are of great current research interests because of their unique catalytic, electronic and photonic properties.
www.chem.rochester.edu /~rocacs/section/symposium2003/poster_a.htm   (4685 words)

 Second Messenger Cascades
Most second-messenger systems that have been explored to date are initiated by ligands binding to receptors, such as an odorant binding to a
-adrenergic receptor in a chemosensor or a photon ``binding" to and isomerizing a rhodopsin molecule in the photoreceptor [Lamb and Pugh Jr.
Here, the rate of G-protein activation will be directly proportional to the amount of bound ligand.
www.klab.caltech.edu /~stemmler/s4node4.html   (528 words)

 From the Cover: A tautomeric zinc sensor for ratiometric fluorescence imaging: Application to nitric oxide-induced ...
Fluorescent chemosensors are well suited to meet the need for
chemosensor 7 as a pale red powder (49 mg, 55% yield).
The quantum yield for apo ZNP1 is 0.02.
www.pnas.org /cgi/content/full/101/5/1129   (3878 words)

 [No title]
We are at the beginning stage of this study.
A fluoride-selective PCT chemosensor based on formation of a static pyrene excimer, Org.
A new fluoride selective fluorescent and chromogenic chemosensor containing naphthalene urea derivative, J. Am.
chem.skku.ac.kr /main/JyLee?action=raw   (675 words)

 Department of Chemistry - Anthony W. Czarnik
Czarnik, A. W.; Yoon, J. “Chemosensors: Synthetic Receptors in Analytical Sensing Applications”, Perspect.
Czarnik, A. “Fluorescent Chemosensors for Cations, Anions, and Neutral Analytes”, in Topics in Fluorescence Spectroscopy, Vol.
Czarnik, A. “Fluorescent Chemosensors of Ion and Molecule Recognition.
www.chem.unr.edu /faculty/awc   (2633 words)

 [No title]
A number of cyclodextrin chemosensors have been synthesized and characterized.
I am interested in creating better chemosensors through the rational design of fluorophores that are more responsive to the molecule recognition process.
In the following project details the proposed synthesis of a cyclodextrin chemosensor that is based on the TICT process.
www.resnet.wm.edu /~cjabel/320-02.doc   (747 words)

 Amy Bruestle 2002-2003   (Site not responding. Last check: 2007-10-20)
Because flow environment affects the structure of odor plumes, I hypothesized that species from different flow environments would have different numbers and arrangements of chemosensors along their antennule filaments.
I hypothesized that those structures might vary as a function of position along the antennule filament.
I found that some parameters (aesthetasc size and arrangement) varied as a function of flow environment, and that some parameters (aesthetasc distribution and arrangement) varied as a function of position.
www.denison.edu /biology/majors/SeniorResearch2003/ABruestle.html   (143 words)

 Goddard Engineering Colloquium Schedule   (Site not responding. Last check: 2007-10-20)
By implanting a microfluorimeter outfitted with both novel indicator chemistry and telemetry, we can monitor glucose levels in the interstitial fluid of rabbits from outside of the rabbit.
As the platform engineering reaches perfection, the list of new applications will be limited only by chemists' ability to discover new chemosensor molecules..
His current research interests include fluorescent chemosensors of ion and molecule recognition, combinatorial chemistry as a tool for drug discovery, and nucleic acids as targets for small molecule intervention.
ecolloq.gsfc.nasa.gov /archive/2001-Fall/announce.czarnik.html   (496 words)

 New molecule detects lead
Using this technology for lead, says chemosensor pioneer Anthony Czarnic of Sensors for Medicine and Science, Inc. is "quite remarkable." Lead, a heavy metal, is renowned for stopping fluorescent molecules from working.
The new compound glows 40-times brighter in the presence of lead ions.
Chen, C-T and Huang, W-P.A highly selective fluorescent chemosensor for lead ions.
www.vaccinationnews.com /DailyNews/June2002/NewMoleculeDetects17.htm   (450 words)

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