Research glossary / 41 terms

A little less jargon.
A little more clarity.

Short definitions for the names, laboratory methods and study language you will meet across this library. Each term includes a note on how to read it in context.

01 / 11

Names & structures

Begin with what the source says the material is.

Read the identity guide
01.01↗

Amino acid

A building block that can be joined to other amino acids in a peptide chain.

In context

The identity of each amino acid and its position in the chain matter when comparing sequences.

01.02↗

Amino acid sequence

The ordered list of amino acids in a peptide, conventionally read from the amino end to the carboxyl end.

In context

Two materials with a similar name can still describe different sequences.

01.03↗

Calculated property

A value derived from a represented chemical structure, such as a formula or molecular weight, rather than measured on a particular sample.

In context

A calculated database value is a comparison target, not proof about the contents of a vial.

01.04↗

Compound name

The name a paper, database, supplier or laboratory uses for a chemical substance.

In context

Copy the exact name used by the source, then check the structure or sequence behind it.

01.05↗

Molecular formula

A count of the kinds and numbers of atoms in a represented molecule.

In context

A formula helps compare descriptions, but it does not by itself establish the material in a submitted sample.

01.06↗

Molecular weight

A value calculated from the atoms represented in a molecule and their atomic weights.

In context

Check the form being described, including salts or modifications, before comparing values.

01.07↗

Peptide

A molecule formed when amino acids are linked through peptide bonds.

In context

The word names a broad class. A specific sequence and chemical form provide the useful identity detail.

01.08↗

Peptide bond

The chemical link joining one amino acid residue to the next in a peptide chain.

In context

The presence of this link alone does not identify a particular peptide.

01.09↗

Stereochemistry

The three-dimensional arrangement of atoms in a molecule, including distinctions such as L and D amino acids.

In context

Matching a name or formula does not always mean two structures have the same stereochemistry.

01.10↗

Synonym

An alternative name recorded for a substance or structure.

In context

A shared or similar synonym is a lead for checking identity, not a substitute for that check.

01.11↗

Terminal modification

A chemical change at one end of a peptide chain, such as amidation or acetylation.

In context

A source may describe a modified form even when a short label omits that detail.

02 / 19

Laboratory reports

Read the sample, method, result and stated limits together.

Read a COA, field by field
02.01↗

Analytical method

The procedure used to examine a sample or measure a property.

In context

An identity result, a purity figure and an amount can answer different questions even when they appear on one report.

02.02↗

Certificate of Analysis (COA)

A document reporting specified analyses and results for an identified submitted sample.

In context

Read the laboratory ID, method, units and scope statement before extending a result to a product or batch.

02.03↗

Chromatogram

A display of detector response or another measured signal across a chromatographic separation.

In context

A plotted trace needs its axes, method and report context; the picture alone is not a complete identification.

02.04↗

Chromatographic peak

A feature in a chromatogram associated with material reaching the detector over a period of time.

In context

One peak is not automatically one fully identified compound; overlapping components can be unresolved.

02.05↗

Chromatographic purity

A purity-related figure derived from the signals reported for a chromatographic method.

In context

Keep the report’s exact definition attached. Peak-area percentage is not automatically absolute mass purity.

02.06↗

Co-elution

Two or more components passing through a chromatographic separation together closely enough that they may not appear as distinct peaks.

In context

A visually simple trace cannot, by itself, rule out every undetected or overlapping component.

02.07↗

Detection limit

The lowest amount or concentration at which a procedure can reliably detect an analyte under stated conditions.

In context

A result below this limit is not an unqualified statement that the analyte is absent.

02.08↗

High-performance liquid chromatography (HPLC)

A liquid chromatography technique that separates components as they move through a column.

In context

HPLC describes a method family. The detector, calibration and procedure details determine what a reported result means.

02.09↗

Identity result

The laboratory’s conclusion about whether a sample matches the identity reference used by its method.

In context

A reported match should stay tied to that sample and method; it does not establish every other quality attribute.

02.10↗

Laboratory ID

The identifier a laboratory assigns to a submitted sample, analysis or report.

In context

Use it to distinguish one certificate from another, even when the compound names are similar.

02.11↗

Lot entry

The batch or lot wording recorded on a document.

In context

Preserve the entry exactly as written; do not fill a missing or descriptive field with an invented batch code.

02.12↗

Mass spectrometry (MS)

An analytical method that measures ions by their mass-to-charge ratio.

In context

The signal can support identity work, but its meaning depends on the instrument method and the question asked.

02.13↗

Measurement uncertainty

A way to describe the remaining spread of values reasonably attributable to a measured quantity.

In context

A precise-looking number does not, on its own, tell you how certain the measurement is.

02.14↗

Quantitation limit

The lowest amount or concentration a procedure can measure quantitatively with suitable performance under stated conditions.

In context

Detection and reliable measurement are separate thresholds.

02.15↗

Quantity result

The amount the laboratory reports for a named material or component.

In context

Keep a measured amount separate from a nominal amount printed in a report header or product name.

02.16↗

Reference standard

A specified comparison material or reference used by an analytical procedure.

In context

A statement that a sample matches a standard is meaningful only with the method and reference context.

02.17↗

Representative sample

A sample selected so its result can appropriately describe a larger lot or population.

In context

A laboratory’s result for the submitted portion does not prove how that portion was selected.

02.18↗

Submitted sample

The material actually received and analyzed by a laboratory.

In context

Start every report interpretation with this scope; results do not automatically apply to other units or later lots.

02.19↗

UV/VIS detection

Detection based on how a substance absorbs ultraviolet or visible light.

In context

The detector records a signal. Interpreting it as identity or quantity still depends on the full analytical procedure.

03 / 08

Reading studies

Keep the experimental setting beside the finding.

Read a research paper
03.01↗

Control group

A comparison group used to help interpret what changed under the conditions being studied.

In context

Check what the group actually received and whether it differs in other important ways.

03.02↗

Endpoint

A defined outcome or measurement a study uses to answer a research question.

In context

Name the exact endpoint rather than turning it into a broader health or product claim.

03.03↗

In vitro

Research performed outside a living organism, for example in cells or an isolated biological system.

In context

A result in that setting is not automatically a result in an animal or person.

03.04↗

In vivo

Research performed in a living organism.

In context

Identify the organism and study design before applying the finding to another setting.

03.05↗

Model

The experimental setting used to investigate a question, such as a cell system, animal model or participant group.

In context

Keep the model visible when summarizing what a study found.

03.06↗

Replication

Repeating an experiment or analysis to examine whether a result can be observed again.

In context

One repeated measurement within a study is different from an independent study reaching a similar result.

03.07↗

Sample size

The number of units included in a study or analysis, such as cultures, animals or participants.

In context

Check what was counted; a count of measurements need not equal a count of independent units.

03.08↗

Study limitation

A feature of a study that constrains how confidently or broadly its findings can be interpreted.

In context

Look for limits in the methods and setting as well as the authors’ discussion.

04 / 03

Sources & scope

Know what a statement points back to, and how far it reaches.

See our editorial approach
04.01↗

Primary source

The original study, laboratory document or record that directly reports the work or result being discussed.

In context

Use a summary to find the source, then check the source itself before repeating a precise claim.

04.02↗

Research use only

CaliLean’s stated restriction to in-vitro research and laboratory use; materials are not for human or animal consumption.

In context

This statement is a use restriction, not a finding about safety, efficacy or approval.

04.03↗

Source

The paper, record, database entry or document used to support a statement.

In context

A useful citation lets a reader see which specific claim the source supports.

Source notes

Go back
to the source.

These are reading aids, not a substitute for a paper, method or laboratory report. For the underlying terminology, start with these reference works, official guidance and the linked CaliLean guides.

CaliLean / original records

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