Research Knowledge Center

Research Glossary

Canonical scientific definitions for research peptides, analytical chemistry, laboratory practices, molecular biology, pharmacology, quality assurance, and Research Use Only terminology.

Glossary content is for laboratory and scientific education only. It does not provide medical advice, clinical recommendations, human-use guidance, veterinary guidance, or treatment protocols.

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Browse 82 foundational terms

A B C D E F G H IJKL MNOP Q R S TUVWXYZ

A

Affinity

Affinity describes the strength of interaction between a ligand and its binding target, such as a receptor or protein.

Receptor Biology

Agonist

An agonist is a ligand that binds to a receptor and activates receptor-associated signaling.

Laboratory Practices

Aliquot

An aliquot is a measured portion of a larger sample or prepared material.

Receptor Biology

Allosteric

Allosteric describes regulation that occurs when a molecule binds to a site distinct from the primary active or orthosteric binding site.

General Peptide Science

Amino Acid

An amino acid is an organic molecule containing amino and carboxyl functional groups that can serve as a building block of peptides and proteins.

General Peptide Science

Analog

An analog is a molecule that is structurally related to another molecule but contains one or more chemical differences.

Analytical Chemistry

Analyte

An analyte is the specific substance or chemical component being measured in an analytical test.

Research Methodology

Assay

An assay is a structured experimental procedure used to detect, measure, or characterize a biological, chemical, or analytical property.

B

Quality Assurance

Batch

A batch is a defined quantity of material produced, processed, or documented together under a shared identifier.

Receptor Biology

Beta-Arrestin

Beta-arrestins are intracellular proteins involved in receptor desensitization, internalization, and signaling pathway regulation.

Receptor Biology

Biased Agonism

Biased agonism occurs when a ligand preferentially activates some receptor signaling pathways over others.

Research Methodology

Bioactivity

Bioactivity is the measurable effect of a substance in a biological experimental system.

Molecular Biology

Biological Pathway

A biological pathway is an ordered set of molecular interactions that produces a cellular or biochemical response.

Research Methodology

Biomarker

A biomarker is a measurable biological feature used as an indicator of a process, state, or response in research.

C

Molecular Biology

cAMP

cAMP, or cyclic adenosine monophosphate, is a second messenger involved in many intracellular signaling pathways.

Quality Assurance

CAS Number

A CAS number is a unique registry identifier assigned by the Chemical Abstracts Service to a chemical substance.

Quality Assurance

Certificate of Analysis

A Certificate of Analysis, or COA, is a document reporting analytical test information for a specific material or lot.

Laboratory Practices

Chain of Custody

Chain of custody is the documented record of possession, transfer, handling, and storage of a material or sample.

Analytical Chemistry

Chromatogram

A chromatogram is a graphical output from chromatography showing detector response over time.

Analytical Chemistry

Chromatography

Chromatography is a separation technique that divides components of a mixture based on their interactions with stationary and mobile phases.

General Peptide Science

Compound

A compound is a chemical substance with a defined composition or identity.

Research Methodology

Control

A control is a reference condition used to compare or interpret results in an experiment.

Laboratory Practices

Cryogenic Storage

Cryogenic storage refers to maintaining materials at extremely low temperatures to preserve stability or biological integrity.

D

Quality Assurance

Documentation

Documentation is the recorded information used to describe, support, or verify a material, process, test, or decision.

Research Methodology

Dose-Response Relationship

A dose-response relationship describes how a measured experimental response changes as the amount or concentration of a test substance changes.

E

Efficacy

Efficacy is the maximum effect a ligand or compound can produce in a defined experimental system.

Molecular Biology

Endogenous

Endogenous describes a molecule, receptor, or process that originates within a biological system.

General Peptide Science

Excipient

An excipient is a non-active formulation component used to support material properties such as stability, structure, or handling.

Research Methodology

Experimental Endpoint

An experimental endpoint is the measured outcome used to evaluate a specific research question.

Research Methodology

Experimental Model

An experimental model is a defined system used to study a biological, chemical, or analytical question.

F

General Peptide Science

Formulation

A formulation is the composition and physical form of a material, including active and non-active components.

Laboratory Practices

Freeze-Thaw Cycle

A freeze-thaw cycle occurs when a material is frozen and later thawed, often repeatedly during storage or handling.

G

Receptor Biology

G Protein-Coupled Receptor

A G protein-coupled receptor, or GPCR, is a membrane receptor that transmits signals through associated G proteins and other intracellular pathways.

H

Half-Life

Half-life is the time required for a measured quantity of a substance or signal to decrease by one half under specified conditions.

Analytical Chemistry

High-Performance Liquid Chromatography

High-performance liquid chromatography, or HPLC, is an analytical separation method used to separate and measure components in a sample.

I

Analytical Chemistry

Identity Testing

Identity testing evaluates whether a tested material matches the expected chemical identity.

Analytical Chemistry

Impurity

An impurity is an unintended component detected in a material or sample.

Research Methodology

In Silico

In silico describes research conducted using computational models or simulations.

Research Methodology

In Vitro

In vitro describes experiments performed outside a living organism, often using cells, purified proteins, enzymes, or biochemical systems.

Research Methodology

In Vivo

In vivo describes research performed within a living organism.

L

Analytical Chemistry

LC-MS

LC-MS combines liquid chromatography with mass spectrometry to separate sample components and measure mass-related signals.

Receptor Biology

Ligand

A ligand is a molecule that binds to a target such as a receptor, enzyme, or binding protein.

Analytical Chemistry

Limit of Detection

Limit of detection is the lowest amount of an analyte that a method can reliably distinguish from background signal.

Analytical Chemistry

Limit of Quantitation

Limit of quantitation is the lowest amount of an analyte that a method can measure with acceptable precision and accuracy.

Quality Assurance

Lot Number

A lot number is an identifier assigned to a specific quantity of material for traceability and documentation.

Laboratory Practices

Lyophilization

Lyophilization is a freeze-drying process that removes water from a frozen material under reduced pressure.

M

Analytical Chemistry

Mass Spectrometry

Mass spectrometry is an analytical method that measures mass-to-charge signals from ionized molecules.

Mechanism of Action

Mechanism of action describes the molecular interactions and pathways through which a substance produces an observed experimental effect.

Research Methodology

Mechanistic Research

Mechanistic research investigates how and why a biological or chemical process occurs.

Analytical Chemistry

Method Suitability

Method suitability describes whether an analytical method is appropriate for the material, measurement, and purpose being evaluated.

General Peptide Science

Molecular Formula

A molecular formula lists the types and numbers of atoms in a molecule.

General Peptide Science

Molecular Weight

Molecular weight is the calculated mass of a molecule based on its atomic composition.

P

Analytical Chemistry

Peak Area

Peak area is the integrated area under a chromatographic peak.

General Peptide Science

Peptide

A peptide is a molecule composed of amino acids joined by peptide bonds.

General Peptide Science

Peptide Bond

A peptide bond is the covalent linkage between the carboxyl group of one amino acid and the amino group of another.

Pharmacodynamics

Pharmacodynamics describes the relationship between a compound and its biological effects in a defined experimental system.

Pharmacokinetics

Pharmacokinetics describes how a compound is absorbed, distributed, metabolized, and eliminated in a biological system.

Potency

Potency describes the amount or concentration of a substance required to produce a defined effect in a specific assay.

Research Methodology

Preclinical Research

Preclinical research is research conducted before or outside clinical evaluation, often using in vitro systems, animal models, or analytical studies.

Analytical Chemistry

Purity

Purity is the relative amount of the target substance compared with detectable non-target components under a specified analytical method.

Q

Quality Assurance

Quality Assurance

Quality assurance is the system of processes used to support consistency, documentation, and controlled review.

Quality Assurance

Quality Control

Quality control refers to testing and review activities used to evaluate whether a material or process meets defined criteria.

R

Receptor Biology

Receptor

A receptor is a biological molecule, often a protein, that binds specific ligands and participates in cellular signaling.

Receptor Biology

Receptor Internalization

Receptor internalization is the movement of receptors from the cell surface into intracellular compartments.

Laboratory Practices

Reconstitution

Reconstitution is the process of returning a dried or lyophilized material to solution using an appropriate laboratory solvent or buffer.

Analytical Chemistry

Reference Standard

A reference standard is a well-characterized material used as a comparison point in analytical testing.

Quality Assurance

Research Use Only

Research Use Only, or RUO, indicates that a material or resource is intended solely for laboratory and scientific research purposes.

Analytical Chemistry

Resolution

Resolution describes how well two analytical signals, such as chromatographic peaks, are separated.

Analytical Chemistry

Retention Time

Retention time is the time it takes for a component to pass through a chromatographic system and reach the detector.

S

Molecular Biology

Second Messenger

A second messenger is an intracellular signaling molecule generated or regulated after receptor activation.

Selectivity

Selectivity describes preference for one target, pathway, or measured component over another.

General Peptide Science

Sequence

Sequence is the ordered arrangement of amino acids or other residues in a peptide or protein.

Molecular Biology

Signal Transduction

Signal transduction is the process by which cells convert molecular interactions into intracellular responses.

General Peptide Science

Solubility

Solubility is the ability of a substance to dissolve in a solvent under specified conditions.

Specificity

Specificity describes the degree to which a molecule, assay, or method preferentially interacts with or measures a defined target.

Laboratory Practices

Stability

Stability describes the ability of a material to maintain its chemical or physical properties under specified conditions over time.

Laboratory Practices

Storage Condition

A storage condition is the defined environment under which a material is maintained, including temperature, light, moisture, and container controls.

Structure-Activity Relationship

Structure-activity relationship, or SAR, describes how molecular structure relates to measured activity in an experimental system.

Analytical Chemistry

System Suitability

System suitability is a set of checks used to confirm that an analytical system is performing appropriately before or during testing.

T

Quality Assurance

Traceability

Traceability is the ability to connect a material, measurement, or record to its source, process history, or reference documentation.

V

Quality Assurance

Validation

Validation is the documented evaluation that a method, process, or system is suitable for its intended analytical or operational purpose.

Research Methodology

Vehicle

A vehicle is a carrier, solvent, or medium used to deliver or prepare a test substance within an experimental system.

Browse by Category

General Peptide Science

11 terms

Amino Acid Analog Compound Excipient Formulation Molecular Formula Molecular Weight Peptide Peptide Bond Sequence Solubility

Analytical Chemistry

17 terms

Analyte Chromatogram Chromatography High-Performance Liquid Chromatography Identity Testing Impurity LC-MS Limit of Detection Limit of Quantitation Mass Spectrometry Method Suitability Peak Area Purity Reference Standard Resolution Retention Time System Suitability

Laboratory Practices

8 terms

Aliquot Chain of Custody Cryogenic Storage Freeze-Thaw Cycle Lyophilization Reconstitution Stability Storage Condition

Molecular Biology

5 terms

Biological Pathway cAMP Endogenous Second Messenger Signal Transduction

Pharmacology

10 terms

Affinity Efficacy Half-Life Mechanism of Action Pharmacodynamics Pharmacokinetics Potency Selectivity Specificity Structure-Activity Relationship

Research Methodology

13 terms

Assay Bioactivity Biomarker Control Dose-Response Relationship Experimental Endpoint Experimental Model In Silico In Vitro In Vivo Mechanistic Research Preclinical Research Vehicle

Receptor Biology

8 terms

Agonist Allosteric Beta-Arrestin Biased Agonism G Protein-Coupled Receptor Ligand Receptor Receptor Internalization

Quality Assurance

10 terms

Batch CAS Number Certificate of Analysis Documentation Lot Number Quality Assurance Quality Control Research Use Only Traceability Validation