Measurement Subtraction
Measurement Subtraction - 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...
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.
08:57
Improving Infrared Spectroscopy Characterization of Soil Organic Matter with Spectral Subtractions
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Cited by 19 •
2019
SOM underlies many soil functions and processes, but its characterization by FTIR spectroscopy is often challenged by mineral interferences. The described method can increase the utility of SOM analysis by FTIR spectroscopy by subtracting mineral interferences in soil spectra using empirically obtained mineral reference spectra.
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...
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
Compatible units are essential because subtraction compares like quantities. Before calculating, convert one measurement so both use the same unit, such as expressing both lengths in centimeters or both time values in seconds. After conversion, align the corresponding place values or fractional parts. This prevents a numerical result from combining unlike units and makes the difference interpretable.
Regrouping becomes necessary when a digit or unit cannot be subtracted directly from the corresponding part of the minuend. In time calculations, for example, one minute can be exchanged for 60 seconds before subtracting seconds. The same principle applies whenever a larger measurement unit contains smaller units. Regrouping preserves the total quantity while making each subtraction step possible.
Measurement subtraction can represent more than a remainder. It may quantify the separation between two lengths, the change in mass or volume, or the amount of time between events. The meaning depends on the situation and the order of the measurements. Subtracting the smaller value from the larger gives a nonnegative difference when the question asks how far apart quantities are.
A reliable workflow starts by identifying the measured attribute and the units, then converting to compatible units if needed. Write the quantities so corresponding units and place values line up, regroup when a smaller part is insufficient, and subtract. Finally, label the result with its unit and check whether its size is sensible for the original measurements.
To find elapsed time, place the starting and ending times in compatible units and subtract the earlier quantity from the later one. If the smaller time units cannot be subtracted directly, regroup a larger unit into its smaller equivalent, such as minutes into seconds. This approach reveals the duration between events rather than merely comparing clock readings.
In laboratory data analysis, measurement subtraction can show how much a measured quantity changed between observations. In planning or scale calculations, it can determine remaining material, distance, volume, or time after part of a quantity is accounted for. The result is useful only when the compared values describe the same attribute and are expressed in compatible units.