Material scientists at the Nano/Bio Interface Center of the University of Pennsylvania have demonstrated the transduction of optical radiation to electrical current in a molecular circuit. The system, an array of nano-sized ...
Nanophysics
Feb 12, 2010
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0
Cells are very good at protecting their precious contents—and as a result, it's very difficult to penetrate their membrane walls to deliver drugs, nutrients or biosensors without damaging or destroying the cell. One effective ...
Bio & Medicine
Aug 22, 2013
1
1
Transparent biosensors embedded into contact lenses could soon allow doctors and patients to monitor blood glucose levels and a host of other telltale signs of disease without invasive tests. Scientists say the bio-sensing ...
Analytical Chemistry
Apr 4, 2017
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706
Diabetes is a metabolic disease defined by high blood sugar levels, and can affect organs such as the heart, eyes and kidneys. According to the World Health Organization, over 420 million people suffer from this condition ...
Analytical Chemistry
May 2, 2017
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24
(PhysOrg.com) -- Surgical removal of a tissue sample is now the standard for diagnosing cancer. Such procedures, known as biopsies, are accurate but offer only a snapshot of the tumor at a single moment in time.
Bio & Medicine
Jul 21, 2009
1
0
New research shows that genetically modified cells can be made to communicate with each other as if they were electronic circuits. The study is a groundbreaking step toward building complex systems where the body's own cells ...
Cell & Microbiology
Mar 7, 2011
1
0
Tumor markers are biological substances, usually proteins, that provide early indication of cancerous or benign tumors in the body.Â
Bio & Medicine
Sep 22, 2015
0
65
The discovery of a fundamental, previously unknown property of microbial nanowires in the bacterium Geobacter sulfurreducens that allows electron transport across long distances could revolutionize nanotechnology and bioelectronics, ...
Nanophysics
Aug 7, 2011
4
0
Just months after setting a record for detecting the smallest single virus in solution, researchers at the Polytechnic Institute of New York University (NYU-Poly) have announced a new breakthrough: They used a nano-enhanced ...
Bio & Medicine
Jul 24, 2013
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1
A team of chemists led by Vincent M. Rotello of the University of Massachusetts Amherst has developed a fast, simple and low-cost field test for detecting bacteria in low concentrations in drinking water using a biosensor ...
Analytical Chemistry
Jun 28, 2011
0
1
A biosensor is a device for the detection of an analyte that combines a biological component with a physicochemical detector component.
It consists of 3 parts:
The most widespread example of a commercial biosensor is the blood glucose biosensor, which uses the enzyme glucose oxidase to break blood glucose down. In doing so it first oxidizes glucose and uses two electrons to reduce the FAD (a component of the enzyme) to FADH2. This in turn is oxidized by the electrode (accepting two electrons from the electrode) in a number of steps. The resulting current is a measure of the concentration of glucose. In this case, the electrode is the transducer and the enzyme is the biologically active component.
Recently, arrays of many different detector molecules have been applied in so called electronic nose devices, where the pattern of response from the detectors is used to fingerprint a substance. Current commercial electronic noses, however, do not use biological elements.
A canary in a cage, as used by miners to warn of gas could be considered a biosensor. Many of today's biosensor applications are similar, in that they use organisms which respond to toxic substances at a much lower level than us to warn us of their presence. Such devices can be used in environmental monitoring, trace gas detection and in water treatment facilities.
This text uses material from Wikipedia, licensed under CC BY-SA
