Turnover Number
Turnover Number - Related Videos
14:27
Steady-state, Pre-steady-state, and Single-turnover Kinetic Measurement for DNA Glycosylase Activity
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Cited by 26 •
2013
Time courses for the glycosylase activity of 8-oxoguanine DNA glycosylase are biphasic exhibiting a burst of product formation and a linear steady-state phase. Utilizing quench-flow techniques, the burst and the steady-state rates can be measured, which correspond to excision of 8-oxoguanine and release of the glycosylase from the product DNA, respectively.
01:29
Analysis of Accounts Receivable Turnover
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2025
Accounts receivable turnover is critical for evaluating how effectively a company manages its credit sales and collections. High turnover typically signals that a company collects outstanding debts promptly. In contrast, a low turnover may point to issues in credit policy or customer payment behavior that can strain cash flow and working capital.Calculating the Turnover RatioThe accounts receivable turnover ratio is calculated as:Accounts Receivable Turnover = Net Credit Sales ÷ Average...
01:23
Analysis of Accounts Payable Turnover
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2025
Efficient payment practices are essential for maintaining healthy supplier relationships and managing short-term liabilities. Businesses monitor this through the accounts payable turnover ratio, which indicates how frequently a company pays off its suppliers within a given accounting period.The accounts payable turnover ratio is calculated by dividing the cost of goods sold (COGS) by the average accounts payable over the same period.A higher ratio typically signals that the firm is paying its...
01:19
Turnover Number and Catalytic Efficiency
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2023
The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second. Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion. The...
01:19
Activity Ratios: Stock Turnover Ratio
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2024
The stock turnover ratio, or the inventory turnover ratio, is a crucial metric for assessing how efficiently a company manages its inventory. It reflects how frequently a company's inventory is sold and restocked within a given period, typically a year. This ratio is critical for businesses to understand how well stock levels are managed to optimize the use of capital invested in inventory. The stock turnover ratio is calculated by dividing the cost of goods sold (COGS) by the average book...
FAQs
Regeneration allows the catalyst to return to an active state after product release, so it can participate in another catalytic cycle. Repeated binding, bond making or breaking, product release, and regeneration increase the number of completed conversions per catalyst amount. Efficient regeneration therefore supports both greater productivity and longer operational durability before activity is lost.
Catalyst deactivation sets a practical limit on Turnover Number because conversion stops increasing when the catalyst can no longer sustain the catalytic cycle. Measuring TON at or before this loss of activity connects the numerical result with catalyst durability. Two systems may therefore differ in TON because one remains active through more repeated cycles under the defined conditions.
The calculation, moles of product formed divided by moles of catalyst, normalizes product formation to the quantity of catalyst used. This helps indicate how many substrate conversions are supported per catalyst amount. Because the value depends on the measured product and catalyst quantities, researchers must interpret it together with the conditions and activity endpoint used.
Each successful stage contributes indirectly by enabling another complete cycle. Reactant binding and bond making or breaking must proceed through the catalytic pathway, while product release and catalyst regeneration must restore the active catalyst. If any stage prevents continued cycling, fewer substrate molecules reach product before deactivation, limiting the resulting Turnover Number.
Researchers determine the moles of product formed, determine the moles of catalyst present, and divide the first quantity by the second. The measurement should specify the reaction conditions and whether the endpoint is catalyst deactivation or an earlier point. Reporting these details makes the productivity and durability result meaningful for comparisons among catalytic systems.
A Turnover Number is defined under specified conditions, and the catalyst may remain active for different numbers of cycles depending on when activity is assessed. Recording the conditions and measurement point connects the numerical value to the actual catalytic performance observed. Without that context, comparisons of catalyst productivity or durability can be difficult to interpret.
Turnover Number supports catalyst evaluation in synthetic chemistry, industrial processes, and energy-related reactions. In these settings, it helps researchers compare how productively and durably different catalysts use a given catalyst amount. The measure can also guide catalyst design by identifying systems capable of repeated conversions before losing activity, supporting resource-efficiency goals.
A higher measured value indicates that the catalyst supported more substrate-to-product conversions per catalyst amount under the reported conditions. Researchers can use this information to assess whether changes to the catalytic system improve repeated cycling, productivity, or resistance to activity loss. The result therefore provides a practical performance target for developing more effective catalysts.