FutureStarr

0 Calculator

# 0 Calculator

It’s easy enough to track your spending, put that data into a spreadsheet, and figure out how much you need to save to pay off a chunk of your outstanding debt. But what if you only have an hour or two to knock out the magic number?

### Calculator

The p-value can be used to detect very strange, or unlikely, results in the limiting dilution assay. For instance, if several large wells are negative but several small wells are positive, the resulting p-value will be very low, indicating that there may have been cross-contamination, improper labeling of wells, insufficiently mixed cells, or another failure of the assay. (Frequent users of this calculator should note: Every 100 assays that you run, you should expect to see a p-value below 0.01, just by chance!) This calculator features three ways to input data. The "Custom Well Sizes" pane allows you to input data with maximum flexibility. The "Constant Limiting Dilution" pane, on the other hand, will automatically compute your well sizes given the starting well size and a dilution factor. While these are both useful, regular users may prefer the convenience of pasting data in bulk or uploading it from a text file. To use this feature, format your text such that each row has three numbers: the well size (# cells), the number of replicates for this size, and the number of positive outcomes for this size. The upload/paste feature also allows you input data for multiple patients. In this mode, the app will produce a graph showing the infection frequencies (IUPM) across the set of patients.

The Threshold Calculator is a flexible risk assessment tool for metals in soil and it can be used in various parts of the world to derive soil type-specific ecotoxicological thresholds for different protection goals. This tool calculates ecotoxicological threshold concentrations for the metals Cd, Co, Cu, Pb, Mo, Ni and Zn based on chronic toxicity data for their direct effects to soil dwelling organisms (plants, invertebrates and microbial processes) and, where relevant, for secondary poisoning to mammals and birds through bioaccumulation in the food chain. All threshold values are expressed as (pseudo-)total (i.e. aqua-regia extractable) metal concentrations in soil (mg/kg dry weight). The goal of this tool is to make maximal use of available toxicity data and bioavailability models for the derivation of soil quality standards for specific protection goals, jurisdictions, regions or sites. (Source: www.arche-consulting.be)

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