Subtraction Factor
Subtraction Factor - Related Videos
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...
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...
09:40
Novel Sequence Discovery by Subtractive Genomics
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Cited by 7 •
2019
The purpose of this protocol is to use a combination of computational and bench research to find novel sequences that cannot be easily separated from a co-purifying sequence, which may be only partially known.
04:01
Factors Affecting Solubility
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2020
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide: This solubility equilibrium may be shifted left by the addition of either silver or iodide ions, resulting in...
12:19
Rapid Subtractive Patterning of Live Cell Layers with a Microfluidic Probe
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Cited by 2 •
2016
We present a protocol to perform subtractive patterning of live cell monolayers on a surface. This is achieved by local and selective lysis of adherent cells using a microfluidic probe (MFP). The cell lysate retrieved from local regions can be used for downstream analysis, enabling molecular profiling studies.
FAQs
The calculation first adjusts the reference contribution, then subtracts that adjusted value from the observation. This sequence keeps the baseline correction tied to the specified factor rather than removing an unadjusted background term. In environmental monitoring, preserving that order helps distinguish the target signal from pre-existing conditions, measurement effects, or natural variability.
The reference should represent the baseline or background contribution that the analysis intends to remove. Its suitability depends on the environmental measurement and the condition being assessed, such as a pre-existing level, natural variation, or measurement-related effect. A poorly matched reference can change the corrected result and weaken comparisons among observations.
Documentation records which adjustment was used and provides context for the resulting value. Because the factor influences the corrected measurement, its record supports transparent comparisons across sites or time periods. It also helps readers judge the reliability of an environmental assessment rather than treating corrected values as independent of the assumptions used to produce them.
An uncorrected observation includes the measured value together with the contribution selected for removal, while a corrected value reflects the remaining signal after the adjusted reference is subtracted. Examining both can clarify how strongly the baseline affects interpretation. This distinction matters when assessing pollutant concentrations, emissions, resource use, or monitoring results.
First identify the measured observation and the reference contribution to be removed. Next specify the numerical factor and apply it to that reference term. Subtract the resulting adjusted reference from the observation, then record the inputs and correction used. This workflow makes the calculation traceable and supports later comparisons across measurements, locations, or periods.
The approach can support analyses of pollutant concentrations, emissions, resource use, and environmental monitoring data. In each case, the adjustment helps separate a target signal from a documented baseline, background contribution, or other specified component. Its value depends on choosing a suitable reference and recognizing how the factor affects comparisons and assessment reliability.