User:Jonathan Cline/Notebook/Sensors/20130430

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Microbiology Sensors (2013)

Jonathan Cline

jcline@ieee.org

© 2013

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Engineered Biology - Microbiology Sensors

LED Emitter-Detector Sensors

  • Ocean Optics Oxygen Sensing Technologies

Product Spotlight - NeoFox Sport Oxygen Sensor


Engineered Biology - Microbiology Sensors

LED Emitter-Detector Sensors

  • Ocean Optics Oxygen Sensing Technologies

Optical Non-Intrusive Measurement of Dissolved Oxygen and pH in Wine Processing



Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat Manual

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Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat Manual

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Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat Manual

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Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat Manual

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Engineered Biology - Microbiology Sensors

Quick Visual on Peristaltic Pumps

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Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat Manual

 
Masterflex L/S precision variable speed drive
EW-07520-50
each, $850
 
Masterflex Standard pump head for L/S 13 tubing
EW-07013-20
each, $112
 
Masterflex PharMed BPT Tubing, L/S #13
EW-06508-13
25'', $67

Does that come with a built-in television?



Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat 'Ministat' Manual

http://dunham.gs.washington.edu/DunhamLabMinistats.pdf?

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Engineered Biology - Microbiology Sensors

Dunham Lab Chemostat 'Ministat' Video

Aaron W. Miller, Corrie Befort, Emily O. Kerr, Maitreya J. Dunham Department of Genome Sciences, University of Washington

"design and operation of a relatively simple, low cost array of miniature chemostats .. in determination of physiology and in evolution experiments with yeast"

JOVE (VIDEO): Design and Use of Multiplexed Chemostat Arrays

Miller, A. W., Befort, C., Kerr, E. O., Dunham, M. J. Design and Use of Multiplexed Chemostat Arrays. J. Vis. Exp. (72), e50262, doi:10.3791/50262 (2013).



Engineered Biology - Microbiology Sensors

Portable LED-array VIS–NIR spectrophotometer/nephelometer

  • 7 DEC 1998

"A portable instrument with a high-speed multiple-wavelength LED array source, and simultaneous detectors for absorbance and 90° nephelometry, was tested from 420 to 950 nm. Absorbance values and simultaneous 90°-scatter intensities at six different wavelengths can be determined and stored every 0.02 s. An advantage of this LED instrument is that its sensitivity is equal to or better than many research-grade spectrophotometers. Also, unlike diode array spectrometers, which emit white light through samples, the LED instrument emits monochromatic light through samples, enabling us to obtain turbidity, turbidity ratio, and particle size information in addition to the absorption spectrum. Field applications can range from simple turbidity and multiple-wavelength absorbance measurements to kinetic experiments with temporal acquisition of multiple-wavelength absorbance and simultaneous turbidity data. Rugged, laptop compatible, portable, and inexpensive, the LED instrument is useful for discrete or on-line VIS–NIR absorption analysis and turbidity, or turbidity ratio, analysis. © 1998 John Wiley & Sons, Inc. Field Analyt Chem Technol 2: 21–28, 1998"



Engineered Biology - Microbiology Sensors

[http://www.mdpi.com/1424-8220/8/4/2453/pdf? Absorbance Based Light Emitting Diode Optical Sensors and Sensing Devices] October 2007, Sensors 2008, 8, 2453-2479

"Hauser et al. [71] employed a fiber optic coupler to guide the light from up to 7 LEDs into a single measuring cell. This photometer could be configured to detect Al, Cu, NH3, Cu, Ca, chromium, phosphate and nitrite using colorimetric methods. Acoupler was used to merge the light from one of the 7 input channels into 2 output fibers. "

"LED as both light source and detector for analytical applications has been developed by Lau et al. The emitter LED is forward biased while the detector LED is reverse biased. ... Additional advantages .. is the size, low power consumption (can operate in microwatts range), can detect low absolute light levels, responds to a broad spectral range (247 to >900 nm) and can achieve good S/N ratio. "



Engineered Biology - Microbiology Sensors

[http://www.mdpi.com/1424-8220/8/4/2453/pdf? Absorbance Based Light Emitting Diode Optical Sensors and Sensing Devices] October 2007, Sensors 2008, 8, 2453-2479

"Due to outbreaks such as foot and mouth disease, chicken flu virus and bovine spongiform encephalopathy (BSE) food safety assurance is of utmost importance. LED based chemical sensors have also been applied to the monitoring of food products [97, 121, 122]."

"Pacquit et al.employed an LED based detector to monitor fish spoilage [97, 123]. The on package sensor contains the pH sensitive bromocresol green,which responds through visible change to basic volatile spoilage compounds such as trimethylamine (TMA), ammonia (NH3) and dimethylamine (DMA) collectively referred to as Total Volatile Basic Nitrogen (TVB-N). "

"Teshima et al.employed an LED based liquid core waveguide (LCW) absorbance detector for the measurement of gaseous acetone in human breath. Monitoring breath acetone can be useful to follow patients on a prescribed diet regimen as well as tomonitor diabetic patients. The detection chemistry was based on the reaction of acetone with alkaline salicylaldehyde to form a coloured product, which absorbs in the blue and can be monitored with GaN based LEDs (? max465 nm) [126]. "


Engineered Biology - Microbiology Sensors

Mercury

WHO Guidance for Identifying Populations at Risk from Mercury Exposure August 2008


"Mercury is also relatively volatile and, therefore, easily lost during sample preparation and analysis. ... Most of the methods available to determine mercury levels in blood, urine, tissues, and hair use atomic absorption spectrometry (AAS), atomic emission spectrometry (AES), atomic fluorescence spectrometry (AFS), neutron activation analysis (NAA), mass spectrometry (MS), or anodic stripping voltametry (ASV). Cold vapour AAS (or CVAAS) is the most widely used."




Engineered Biology - Microbiology Sensors

Mercury

A simple, low cost, multielement atomic absorption spectrometer with a tungsten coil atomizer

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"This instrument uses an inexpensive tungsten coil atomizer that is extracted from a standard 150 W projector bulb. The temperature of the coil is computer-controlled by changing the voltage across the coil. A low voltage is first used to dry the sample then a higher voltage is used to atomize the sample. Simultaneous detection of the analyte absorption signals is accomplished using a charge-coupled device. The elements of interest in this study were Cd, Pb, and Cu."



Engineered Biology - Microbiology Sensors

Jonathan Cline

jcline@ieee.org

© 2013

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