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04/09/2026

Biuret Reaction: Measuring Serum Proteins

The Biuret reaction is a classic laboratory method for measuring serum protein concentration. In an alkaline environment, copper (II) ions form a red‑purple complex with the nitrogen atoms of peptide bonds. The deeper the purple color, the higher the protein concentration — because the intensity is directly proportional to the number of peptide bonds present.

However, certain conditions can interfere with accuracy:

• Lipaemic serum (milky appearance)
• Hemolysis (ruptured red cells)
• Hyperbilirubinemia (excess bilirubin)
• Hyperammonemia (ammonia competing with copper ions)

When these occur, alternative methods such as turbidimetric reactions or dye binding assays (e.g., Coomassie blue, pyrogallol red‑molybdate) are used.

04/09/2026

How Caffeine Hijacks Your Brain

03/09/2026

🩸 Sepsis Part 2: Why Blood Pressure Falls

In sepsis, inflammatory signals cause blood vessels to dilate and become leaky. This lowers vascular resistance and lets plasma escape into tissues, reducing effective circulating volume and venous return—ultimately causing blood pressure to fall.

03/09/2026

Sepsis Part 1: When Infection Goes Systemic 🦠

Sepsis begins with an infection that triggers an abnormal immune response. Immune cells release inflammatory mediators, and when this response becomes dysregulated and systemic, it can disrupt circulation and organ function.

02/09/2026

Understanding Anaphylaxis Part 5: Distributive Shock to PEA Arrest

Vasodilation and capillary leak deplete circulating volume, dropping venous return and cardiac output. As profound hypotension starves the brain and coronaries, mechanical pumping ceases—progressing to pulseless electrical activity and cardiac arrest.

02/09/2026

Understanding Anaphylaxis Part 4: When Airways Close & Shock Begins

Histamine and leukotrienes trigger bronchospasm, while airway edema and mucus obstruct airflow. At the same time, systemic vasodilation and fluid leakage reduce circulation—leading to hypoxemia and distributive shock.

01/09/2026

Heart Unlocked 🫀

Explore the heart in 3D and follow blood’s journey: body → right heart → lungs → left heart → body. See deoxygenated blood travel through pulmonary arteries and oxygenated blood return through pulmonary veins before leaving through the aorta.

31/08/2026

Anaphylaxis Part 3: Vascular Changes

Histamine dilates blood vessels and increases permeability. Fluid leaks into tissues, causing swelling. These changes set the stage for airway constriction… watch for Part 4.

31/08/2026

Part 2: Mediator Release & Chemical Cascade | 3D Micro-Cellular Medical Animation

When IgE antibodies trigger mast cells and basophils, the reaction is explosive! ⚡ Watch how pre-formed mediators like histamine and serotonin are released via compound exocytosis, followed by newly synthesized leukotrienes attacking the vascular lining.

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30/08/2026

When an allergen breaches the bloodstream, the immune system engages. Cyan IgE antibodies bind to its epitopes, docking onto high-affinity mast cell receptors. As multivalent allergens cross-link adjacent IgE, histamine granules destabilize—igniting the countdown to acute allergic response.

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