Agar Block Angling

Agar block angling is a tissue-preparation technique that uses a shaped or tilted agar support to orient neural specimens for consistent handling, sectioning, or imaging. The agar block stabilizes the sample while its angle aligns the tissue with the desired anatomical plane, helping researchers obtain reproducible sections and expose specific regions of the nervous system. In neuroscience, this approach supports microscopy, histological analysis, and circuit-level studies by improving specimen positioning and reducing movement during processing. Careful control of the block’s geometry and orientation can enhance image quality, preserve anatomical relationships, and improve comparisons across experimental samples.

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Research

JoVE EoE - Neuropathology

Assessing Muscle Contraction with Neuromuscular Blocker Treatment

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2025

This video demonstrates assessing the muscle using cultured motor neurons, Schwann cells, and myotubes, followed by treatment with a neuromuscular blocker to inhibit contraction. Color-coded time-motion graphics show a color-coded time-motion graphic. Red indicates the fastest movement, and blue indicates the slowest.

Assay for Adhesion and Agar Invasion in S. cerevisiae

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Cited by 17 •

2006

We describe a qualitative assay for yeast adhesion and agar invasion as a measure of invasive and pseudohyphal differentiation. This simple assay can be used to assess the invasive phenotype of various mutants as well as the effects environmental cues and signaling pathways on yeast differentiation.

Intravenous Delivery of Receptor Blockers to Reduce Brain Edema in a Mouse Model

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2025

Source: Zeynalov, E. et. al., Continuous IV Infusion is the Choice Treatment Route for Arginine-vasopressin Receptor Blocker Conivaptan in Mice to Study Stroke-evoked Brain Edema. J. Vis. Exp. (2016)This video demonstrates the intravenous delivery of an arginine-vasopressin (AVP) receptor antagonist in a mouse model. Transient middle cerebral artery occlusion induces brain edema. An AVP receptor antagonist is administered through a catheter in the left jugular vein, alleviating edema.

Subculturing Sulfite-Reducing Anaerobic Bacteria from an Agar Culture

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2025

Source: Anwar, Z., et al. Enrichment and Detection of Clostridium perfringens Toxinotypes in Retail Food Samples. J. Vis. Exp. (2019).In this video, sulfite-reducing bacteria are cultured in a sulfite-containing agar medium, where they grow anaerobically and reduce sulfite to hydrogen sulfide, forming black precipitates with iron ions. Black colonies are isolated from the agar depth using aseptic techniques and transferred to fresh medium for continued anaerobic incubation.

Education

JoVE Core - Pharmacology

Depolarizing Blockers: Pharmocokinetics

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2023

Depolarizing blockers are administered through intravenous injection. Succinylcholine is the most common choice of depolarizing blockers in emergency clinical practices. Although they have a rapid onset, they readily diffuse away from the motor end plate into the extracellular fluid. They are metabolized by enzymes such as liver butyrylcholinesterase and plasma pseudocholinesterases. This produces a short duration of action, typically 5-10 minutes long, unlike nondepolarizing blockers, which...

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