Formalinization Techniques
Formalinization Techniques - Related Videos
02:42
Formal Charges
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2020
In some cases, there are seemingly more than one valid Lewis structures for molecules and polyatomic ions. The concept of formal charges can be used to help predict the most appropriate Lewis structure when more than one reasonable structure exists. Calculating Formal Charge The formal charge of an atom in a molecule is the hypothetical charge the atom would have if the electrons in the bonds are evenly distributed between the atoms. Alternatively, formal charge results when from the number...
02:19
Lewis Structures and Formal Charges
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2025
Lewis symbols can be used to indicate the formation of covalent bonds, which are shown in Lewis structures—drawings that describe the bonding in molecules and polyatomic ions. The periodic table can be used to predict the number of valence electrons in an atom and the number of bonds that will be formed to reach an octet. Group 18 elements, such as argon and helium, have filled electron configurations and thus rarely participate in chemical bonding. However, atoms from group 17, such as bromine...
11:04
Quantification of Global Diastolic Function by Kinematic Modeling-based Analysis of Transmitral Flow via the Parametrized Diastolic Filling Formalism
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Cited by 8 •
2014
Accurate, causality-based quantification of global diastolic function has been achieved by kinematic modeling-based analysis of transmitral flow via the Parametrized Diastolic Filling (PDF) formalism. PDF generates unique stiffness, relaxation, and load parameters and elucidates 'new' physiology while providing sensitive and specific indexes of dysfunction.
04:14
Lab Techniques - Concepts
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2020
Measurement Accuracy The ability to repeat an experiment and get the same results, or reproducibility, is essential in scientific research. However, it’s impossible to repeat an experiment if you don’t know how you did it. Thus, scientists keep detailed records of their experiments in lab notebooks. These records include important information like the amount of each material used and descriptions of each step of the procedure. Equipment, like balances and volumetric or graduated glassware, is...
08:12
Zebrafish Microinjection Techniques
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2023
One of the major advantages to working with zebrafish (Danio rerio) is that their genetics can be easily manipulated by microinjection of early stage embryos. Using this technique, solutions containing genetic material or knockdown constructs are delivered into the blastomeres: the embryonic cells sitting atop the yolk of the newly fertilized egg. Delivery into the cytoplasm is achieved either through direct injection into the blastomere, or via natural cytoplasmic movements that occur after a...
FAQs
Formaldehyde preserves tissue by reacting with proteins and creating cross-links that stabilize cellular structures. This chemical stabilization reduces autolysis, the breakdown of tissue by its own processes, and slows decomposition. As a result, the specimen retains an architecture that can be processed and examined rather than rapidly losing its organization.
Fixation time, formalin concentration, and tissue thickness are central control variables. Their proper adjustment helps preserve tissue architecture while also retaining molecular targets needed for immunohistochemistry and related diagnostic analyses. Poor control can create an imbalance between structural preservation and molecular detectability, reducing the specimen’s usefulness for later examination.
The fixation approach must account for downstream molecular testing because diagnostic work may require both recognizable architecture and retained molecular targets. Immunohistochemistry depends on those targets, whereas microscopic assessment depends on preserved structure. Controlling fixation conditions therefore supports complementary analyses rather than prioritizing one type of information at the expense of the other.
Once a biopsy or surgical specimen has been adequately fixed, it can proceed to paraffin embedding, followed by sectioning and microscopic evaluation. This sequence converts stabilized tissue into sections suitable for histopathology. The resulting preparation allows examiners to assess maintained cellular architecture and identify disease-related changes in a diagnostic or research workflow.
Biopsy and surgical specimens are key medical materials for this approach because their tissue architecture may need evaluation after collection. Following fixation, they can be embedded in paraffin, sectioned, and examined microscopically. This workflow supports histopathology, where preserved structural features help investigators or diagnosticians assess changes associated with disease.
The central materials and stages are formalin for initial fixation, paraffin for embedding, and sectioning before microscopy. Formalin stabilizes the specimen, paraffin provides a subsequent embedding step, and sectioning prepares the preserved tissue for evaluation. Together, these stages connect chemical preservation with practical histopathology and research examination.
Formalinized specimens support both histopathological assessment and research because they retain tissue architecture for microscopic study and can preserve molecular targets for immunohistochemistry. This combination allows disease-related structural changes to be examined alongside targeted diagnostic analyses. The value is greatest when fixation variables are controlled to suit the intended downstream examination.