Absorbance Subtraction
Absorbance Subtraction - Related Videos
07:51
Gas Absorber
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Gas absorbers are used to remove contaminants from gas streams. Multiple designs are used to accomplish this objective1. A packed bed column uses gas and liquid streams running counter to each other in a column packed with loose packing materials, such as ceramics, metals, and plastics, or structured packing1. The packed bed uses surface area created by the packing to...
13:44
Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Cited by 6 •
2012
This protocol outlines the simulation, fabrication and characterization of THz metamaterial absorbers. Such absorbers, when coupled with an appropriate sensor, have applications in THz imaging and spectroscopy.
01:22
Detection of Internal Carotid Artery Narrowing Using Digital Subtraction Angiography
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2025
Position a human patient with internal carotid stenosis, a condition characterized by narrowing of the internal carotid artery, on the imaging table for digital subtraction angiography (DSA). Insert an angiocatheter into the common carotid artery at the fourth cervical vertebra level. Capture a pre-contrast X-ray image to record background structures like bones and soft tissues using X-ray irradiation. Administer an iodine-based contrast medium into the carotid artery. The contrast medium...
09:43
Measuring Reaction Time and Donders' Method of Subtraction
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University The ambition of experimental psychology is to characterize the mental events that support the human ability to solve problems, perceive the world, and turn thoughts into words and sentences. But people cannot see or feel those mental events; they cannot be weighed, combined in test tubes, or grown in a dish. Wanting to study mental life, nonetheless, Franciscus Donders, a Dutch ophthalmologist in the early 1800s, came up with a...
13:37
Template Directed Synthesis of Plasmonic Gold Nanotubes with Tunable IR Absorbance
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Cited by 1 •
2013
Solution-suspendable gold nanotubes with controlled dimensions can be synthesized by electrochemical deposition in porous anodic aluminum oxide (AAO) membranes using a hydrophobic polymer core. Gold nanotubes and nanotube arrays hold promise for applications in plasmonic biosensing, surface-enhanced Raman spectroscopy, photo-thermal heating, ionic and molecular transport, microfluidics, catalysis and electrochemical sensing.
FAQs
Matching conditions helps ensure that the blank, control, or untreated reference contains the same background contributions as the experimental sample. Solvents, media, plates, and other components can contribute absorbance that varies with measurement conditions. Using a comparable reference allows subtraction to target these shared contributions more effectively, leaving a reading that better represents the substance or response of interest.
Absorbance can differ across wavelengths, so the background value must correspond to the wavelength used for the experimental reading. Subtracting the reference absorbance at that specific wavelength reduces the influence of non-target components in the measured signal. This supports more meaningful interpretation when the assay signal is linked to cell activity, biomolecular content, or treatment response.
The correction can reduce contributions from solvents, culture media, plates, and other components present during measurement. These materials may add to the recorded absorbance even when they are not the biological signal being investigated. Including an appropriate blank, control, or untreated reference helps distinguish those background contributions from changes associated with cancer samples or experimental treatments.
First, measure a blank, control, or untreated reference at the wavelength used for the experiment. Next, measure the corresponding experimental sample under the same conditions. Subtract the reference absorbance from the experimental absorbance, then use the corrected value for comparison. This workflow reduces background contributions before interpreting differences among samples or treatment groups.
It is useful when cancer experiments rely on colorimetric or fluorescence-linked assays whose readings may include contributions from the surrounding measurement system. Correcting those readings can support analysis of cell activity, biomolecular content, and treatment responses. The approach is particularly relevant when researchers need to compare cancer samples with controls while reducing absorbance unrelated to the biological measurement.
Subtracting the reference value reduces shared background contributions before sample comparisons are made. The resulting corrected measurements can provide a clearer basis for evaluating differences between cancer samples, untreated controls, or treatment conditions. In this way, absorbance subtraction strengthens interpretation of whether observed changes are associated with cellular activity, biomolecular content, or treatment response rather than measurement components.