Media
Create a DJ-style, pitch-preserving speed ramp between two BPM values.
audio-bpm-transition-builderMedia
Transpose a song by key or semitones while preserving its duration and speed.
audio-key-change-for-singersEducation
Specific growth rate µ from a doubling time or two counts, with per-hour/day/minute rates and E. coli benchmarks. Educational use only.
growth-rate-constantEducation
10-fold series design: step count from a target, per-tube concentration table, and the 1:9 transfer recipe. Educational use only.
serial-dilution-plannerEducation
Per-residue counts and mol%, group tallies, Kyte–Doolittle GRAVY score, and ProtParam MW from a sequence. Educational use only.
amino-acid-compositionEducation
Least-squares BSA curve, back-calculated unknowns with dilution factor, extrapolation flags, and protein-specific dye-response caveats. Educational use only.
bradford-assay-calculatorDevelopment
Pixel-accurate Google SERP preview for desktop and mobile, light and dark: current truncation budgets, 2025+ URL line formats, review stars and product rich results, byline dates, meters and diagnostics.
serp-preview-simulatorEducation
Specific activity = U ÷ mg protein (or U/mL ÷ mg/mL): the purity metric of every purification table, with nkat/mg conversion and the kcat/MW purity ceiling. Educational use only.
specific-activity-calculatorMedia
Detect loop transients and pull them toward a beat grid, swing template, or a reference audio groove.
audio-groove-quantizeEducation
Exact or averaged restriction-fragment sizes: circular substrates give n fragments from n cuts (wrapping the origin), linear DNA n+1, from cut positions or a site count. Includes 4/6-base recognizer frequencies (256/4096 bp) and agarose resolution advice. Sambrook & Russell / REBASE derived. Educational use only.
restriction-fragment-lengthEducation
PCR Ta by the simple rule (lower primer Tm − 5°C) or the Rychlik 1990 formula (0.3·Tm_primer + 0.7·Tm_product − 14.9), with a ±3°C gradient window and primer-Tm mismatch warning. Derived from Rychlik 1990, Innis & Gelfand 1990, Lorenz 2012. Lab-planning use only.
annealing-temperature-calculatorFormat Conversion
Convert equations between AsciiMath, LaTeX and MathML: auto-detect the input format, produce canonical LaTeX, presentation MathML with an embedded TeX annotation, a best-effort AsciiMath back-translation, a screen-reader aria-label snippet (role=math), and a KaTeX HTML preview.
asciimath-latex-mathml-equation-converter