Related Experiment Video

Updated: Jul 15, 2026

Affinity Purification of a Fibrinolytic Enzyme from Sipunculus nudus
06:45

Affinity Purification of a Fibrinolytic Enzyme from Sipunculus nudus

Published on: June 2, 2023

[Plasminogen activator from Agkistrodon halys halys venom]

V L Karbovs'kyĭ, M Iu Levkiv, O M Savchuk

    Ukrains'Kyi Biokhimichnyi Zhurnal (1999 )
    |May 15, 2007
    PubMed

    More Related Videos

    The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well08:01

    The Nijmegen Hemostasis Assay: Simultaneous Fluorogenic Measurement of Thrombin and Plasmin Generation in a Single Well

    Published on: February 27, 2026

    Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects09:45

    Harvesting Venom Toxins from Assassin Bugs and Other Heteropteran Insects

    Published on: April 21, 2018

    Related Concept Videos

    Anticoagulant Drugs: Low-Molecular-Weight Heparins01:30

    Anticoagulant Drugs: Low-Molecular-Weight Heparins

    Hemostasis is a crucial process that prevents excessive blood loss from damaged blood vessels. It involves various mechanisms such as vasoconstriction, platelet adhesion and activation, and fibrin formation. The importance of each mechanism depends on the type of vessel injury. In contrast, thrombosis is the abnormal formation of a blood clot within the blood vessels, leading to potential complications if the clot obstructs blood flow. Thrombosis can be caused by increased coagulability of the...
    Formation of the Platelet Plug01:22

    Formation of the Platelet Plug

    The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
    As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
    Clot Retraction and Fibrinolysis01:16

    Clot Retraction and Fibrinolysis

    After a fibrin clot is formed, the next step is clot retraction, a vital process facilitated by platelet contractile proteins, such as actin and myosin. These proteins pull the fibrin strands closer together and condense the clot. This action reduces the size of the clot, creating a smaller, denser structure that effectively seals off the damaged vessel. Clot retraction consolidates the clot and helps with wound healing by bringing the edges of the damaged blood vessel closer together.
    Introduction to Hemostasis01:05

    Introduction to Hemostasis

    Hemostasis is a complex physiological process that prevents excessive bleeding when a blood vessel is injured. It's crucial for maintaining the integrity of the circulatory system, as it ensures that our blood remains fluid while still within the vascular network and yet clots to prevent blood loss upon vessel injury.
    The three phases of hemostasis involve many clotting factors present in plasma and several substances released by platelets and injured tissue cells. It is a fast, localized, and...
    Vascular Spasm01:16

    Vascular Spasm

    The vascular phase, also known as vasospasm, is the initial stage of hemostasis, crucial for preventing excessive bleeding when a blood vessel is injured. After a vessel is cut, nerves in the damaged area trigger pain and other sensory impulses. Simultaneously, the smooth muscles in the vessel wall contract, resulting in a vascular spasm. This contraction reduces the vessel's diameter at the injury site, slowing or stopping blood loss through the vessel wall. Vascular spasms typically last for...
    Anticholinesterase Agents: Poisoning and Treatment01:26

    Anticholinesterase Agents: Poisoning and Treatment

    Anticholinesterases, also known as cholinesterase inhibitors, work by blocking the breakdown of acetylcholine, leading to its accumulation in the synaptic cleft. This accumulation indirectly enhances both muscarinic and nicotinic actions. These agents are classified as reversible or irreversible based on their mechanism of action.     
    Irreversible agents form a strong bond with the cholinesterase enzyme, making it inactive. The breakdown of the phosphorylated enzyme is slower than the...