Laboratory Testing
Laboratory Testing - Related Videos
06:00
Experimental Protocol for Using Drosophila As an Invertebrate Model System for Toxicity Testing in the Laboratory
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Cited by 10 •
2018
In this paper, we provide a detailed protocol for exposing species in the genus Drosophila to pollutants with the goal of studying the impact of exposure on a range of phenotypic outputs at different developmental stages and for more than one generation.
10:22
Enrichment of Pachytene Spermatocytes and Spermatids from Mouse Testes Using Standard Laboratory Equipment
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Cited by 29 •
2019
Presented here is a protocol for enriching pachytene spermatocytes, round spermatids, and elongating spermatids from adult mouse testes using a discontinuous bovine serum albumin density gradient with standard laboratory equipment.
06:19
Decontamination for Laboratory Biosafety
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2023
Robert M. Rioux and Zhifeng Chen, Pennsylvania State University, University Park, PA Decontamination is essential for laboratory biosafety, as the accumulation of microbial contamination in the laboratory can lead to the transmission of disease. The degree of decontamination can be classified as either disinfection or sterilization. Disinfection aims to eliminate all pathogenic microorganisms, with the exception of bacterial spores on lab surfaces or equipment. Sterilization, on the other hand,...
08:00
Measuring Mass in the Laboratory
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2023
The analytical balance is the common piece of equipment in the scientific laboratory. These highly precise instruments can measure down to ten thousandths or even hundred thousandths of a gram. The triple beam balance is a type of scale that uses counterweights on a three rider beams to counterbalance the sample in the pan. On the other hand, modern analytical balances use a complex system of electronic sensors to accurately mass a substance. The analytical balance is so sensitive that it...
07:27
Making Solutions in the Laboratory
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2023
The ability to successfully make solutions is a basic laboratory skill performed in virtually all biological and chemical experiments. A solution is a homogenous mixture of solute dissolved in bulk liquid known as the solvent. Solutions can be described by their solute concentration, a measure of how much solute is present per unit of solution. In this video, a step-by-step procedure for how to make a water-based, or aqueous, solution for biological applications is presented. The video...
FAQs
Calibration connects an instrument’s readings to an established measurement reference, while controlled conditions reduce the influence of unintended variables. Together, they make results more consistent and suitable for comparison with specifications, models, or acceptance criteria. In engineering, this control is especially important when small differences in measured performance could affect design verification, safety decisions, or quality judgments.
Standardized procedures specify how a test is conducted so that measurements follow a consistent approach. This improves comparability between results and helps engineers judge whether a material, component, system, or process meets defined requirements. Applying the same procedure also supports quality control and makes test evidence more useful during product development, compliance evaluation, and failure analysis.
These test categories examine different responses or operating influences. Mechanical testing evaluates behavior under applied loads, while electrical, thermal, chemical, and environmental testing addresses performance under their respective conditions. Selecting among them depends on the design question and the requirements being assessed. Combining categories can provide a broader view of how a product or system may perform.
A typical workflow begins by identifying the requirement or performance question, then selecting an appropriate test type, procedure, instrument, and controlled condition. Engineers collect quantitative measurements and compare them with specifications, models, or acceptance criteria. The resulting evidence can support a decision about design performance, product quality, compliance, or the need for further investigation.
Engineers interpret measurements by comparing them with defined specifications, model predictions, or acceptance criteria. A result may demonstrate that a design meets its intended requirement, indicate a performance limitation, or reveal a discrepancy requiring investigation. Because the comparison is tied to a stated requirement, the test provides evidence for decisions rather than serving only as an isolated measurement.
During design verification, testing checks whether a proposed design performs as required before implementation. Quality-control testing examines whether materials, components, or products conform to defined expectations. In failure analysis, measurements help reveal defects or characterize behavior associated with an unsuccessful outcome. These uses allow engineers to refine designs, evaluate reliability, and make evidence-based decisions.