Biological Specimen
Biological Specimen - Related Videos
09:16
Manual Blot-and-Plunge Freezing of Biological Specimens for Single-Particle Cryogenic Electron Microscopy
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Cited by 11 •
2022
This manuscript outlines the blot-and-plunge method to manually freeze biological specimens for single-particle cryogenic electron microscopy.
08:12
Brain Banking: Making the Most of your Research Specimens
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Cited by 21 •
2009
Brain banking and systematic sampling of biological material provides the basis for unbiased stereology and maximizes the potential data obtained from each specimen.
09:03
Rapid Freezing using Sandwich Freezing Device for Good Ultrastructural Preservation of Biological Specimens in Electron Microscopy
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Cited by 5 •
2021
Here we show how to use the sandwich freezing device for rapid freezing of biological specimens, including bacteria, yeast, cultured cells, isolated cells, animal and human tissues, and viruses. We also show how to prepare specimens for ultrathin sectioning after rapid freezing.
09:02
SEM Imaging of Biological Samples
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2023
Source: Peiman Shahbeigi-Roodposhti and Sina Shahbazmohamadi, Biomedical Engineering Department, University of Connecticut, Storrs, Connecticut A scanning electron microscope (SEM) is an instrument that uses an electron beam to nondestructively image and characterize conductive materials in a vacuum. As an analogy, an electron beam is to the SEM as light is to the optical microscope. The difference is that the electron microscope yields images of much higher resolution and magnification. The...
08:28
In situ TEM of Biological Assemblies in Liquid
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Cited by 8 •
2013
Here we describe a procedure to image viral complexes in liquid at nanometer resolution using a transmission electron microscope.
FAQs
Representative collection determines whether observations reflect the organism or situation being studied rather than an unbalanced portion of it. Sampling that captures the relevant biological material supports meaningful comparisons and reduces misleading conclusions. This principle matters in classification, disease investigation, and ecological research, where differences between specimens may influence how biological structure or function is interpreted.
Accurate labeling preserves the connection between a sample and the biological evidence it represents. It allows investigators to distinguish specimens during observation, analysis, and later comparison, reducing the risk that results become associated with the wrong material. For collections used in teaching or future studies, clear identification also strengthens the specimen's value as a reliable scientific record.
Preservation protects the features investigators intend to examine by limiting degradation and changes caused by environmental conditions. If a specimen changes after collection, observed structure or measured biological material may no longer reflect its original state. Appropriate preservation therefore supports dependable microscopy and molecular analysis, while poor control can weaken comparisons and reduce confidence in experimental results.
Contamination and degradation threaten specimen quality in different ways. Contamination introduces unwanted biological material, whereas degradation changes or damages the collected material over time. Both can interfere with observations and analyses, but recognizing the distinction helps researchers evaluate why results may be unreliable. Careful handling and preservation address these risks before they compromise interpretation.
Preparation begins with representative collection, followed by accurate labeling and handling suited to the material. Preservation then helps limit contamination, degradation, and environmentally caused changes before observation or analysis. This sequence creates a traceable connection between the collected evidence and results from microscopy, molecular analysis, classification, disease investigation, or ecological research.
A well-prepared specimen links direct biological evidence with experimental results and creates a record that can support comparison over time. When collection, labeling, handling, and preservation are reliable, other investigators can interpret findings against better-defined material. This role is important in biology because specimens may support teaching, classification, disease investigation, ecological research, and future studies.