research sourcing
What a quotation can and cannot promise
Check a quotation for the scope, documents, and acceptance test it writes down, and treat an unstated date, performance, or result as not yet agreed.
8 October 2026 · 9 min read
Knowledge centre
Methods a laboratory can check.
Guides, method explainers and sourcing notes for research laboratories. Written by the EVRINTH Editorial Team from published methods, with catalogue links for enquiry rather than stock claims.
All topicsBuffers and laboratory water26Cell culture26Chromatography26Cold chain and sample storage26Cytometry and microscopy26DNA sequencing26Gels and blotting26Gene expression26Genome editing26Immunoassays26Laboratory labware26Laboratory safety26Liquid handling26Microbiology26Molecular cloning26Nucleic acid purification26PCR and amplification26Protein biochemistry26Proteomics26Research sourcing and study design26
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520 articles
laboratory safety
What an autoclave indicator does not prove
Tape, a chemical integrator, and a biological indicator answer different questions. Choose the class that matches the claim you need about a cycle.
8 October 2026 · 10 min read
protein biochemistry
What an extinction coefficient assumes
A composition-based extinction coefficient is a conversion with conditions attached. Tags, cofactors and nucleic acid change the number you may report.
8 October 2026 · 6 min read
microbiology
What blue and white colonies can and cannot mean
Blue and white colonies report alpha-complementation, which is a screen. A white colony still needs a digest or a sequence before anyone calls the insert correct.
8 October 2026 · 9 min read
pcr amplification
What dNTPs magnesium and polymerase each do
Change dNTPs, magnesium, or polymerase one variable at a time, and treat proofreading fidelity as a cloning choice rather than a brighter band.
8 October 2026 · 8 min read
genome editing
What sequence data to request after an edit
After an edit, request coordinates, the genome build, FASTQ files, an allele table, coverage and controls. A PDF of the on-target site is not the dataset.
8 October 2026 · 8 min read
dna sequencing
What to check before a sequencing run
What to confirm before a sequencing run: sample identity, amount, fragment size, indexes, and which failed check should stop the instrument.
8 October 2026 · 8 min read
dna sequencing
What to put in a sequencing statement of work
The lines a sequencing statement of work needs: organism, geometry, depth, reference build, files, retention and the rule for a failed sample.
8 October 2026 · 7 min read
molecular cloning
What to send for a gene synthesis enquiry
See which missing field blocks a gene-synthesis quotation: sequence, vector, host, sites, expression limits, and the biosafety of the DNA.
8 October 2026 · 7 min read
research sourcing
When a manufacturer name is a compatibility note
Treat a manufacturer name as a rotor, plate, or fitting the consumable must meet, and write an equivalent the laboratory can test.
8 October 2026 · 10 min read
nucleic acid purification
When to repeat an extraction
Compare repeating the extraction, diluting and retrying the assay, and cleaning the same eluate. Use blanks, labels, yield and debris to choose.
8 October 2026 · 7 min read
labware
When to use plastic tubes tips and plates
When polypropylene tubes, pipette tips and polystyrene plates are the right vessel, and when solvent or volume still belongs in glass.
8 October 2026 · 8 min read