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Honey Bee Stingers Use Double-Piston Mechanism to Pump Venom
· Confirmed
In Short: Researchers from Macquarie University and the University of New South Wales have published a study in the Proceedings of the National Academy of Sciences detailing the intricate venom-pumping mechanism of honey bee stingers.
Researchers from Macquarie University and the University of New South Wales have published a study in the Proceedings of the National Academy of Sciences detailing the intricate venom-pumping mechanism of honey bee stingers.
The study reveals that the stinger's unique geometry, with collapsible valves acting as pistons, allows for continuous venom delivery.
The stinger consists of three main interlocking elements: a stylet that widens to form the main pumping chamber and two sharp-tipped lancets that slide back and forth.
These lancets, when inserted into a target, act like miniature pistons, pumping venom into the tissue.
The process, known as autotomy, is fatal to the bee but ensures venom delivery continues long after the bee has flown away.
The researchers filmed the stinger as it penetrated a transparent gel designed to mimic human skin, revealing the complete pumping cycle.
The footage showed the lancets ratcheting deeper and venom flowing into the gel even without the bee attached.
Dr. Fiorella Ramirez-Esquivel, a co-author of the study, explained, “The unique geometry of the valves is the key; they act as collapsible pistons and—by pumping in opposite directions—they’re able to deliver a continuous flow of venom.”
The study adds to the understanding of venom delivery mechanisms in the natural world, highlighting the sophistication of the honey bee's stinger.
While scorpions and spiders use muscles surrounding their venom glands to eject venom, bees use a more complex double-piston design.
The research underscores the importance of removing a bee stinger quickly, as the venom sac can continue pumping venom for up to a minute.
This mechanism ensures that the venom delivery continues even after the bee has flown away, potentially causing more harm to the victim.
What this adds
The study provides new insights into the biomechanics of honey bee stingers, revealing the intricate double-piston mechanism that allows for continuous venom delivery.
The high-speed videography and micro-computed tomography scans captured the complete pumping cycle of the stinger, providing a detailed view of the venom delivery process.
The research highlights the unique design of the honey bee stinger, which is different from the venom delivery systems used by other venomous creatures like spiders and scorpions.
What's confirmed
- “The unique geometry of the valves is the key; they act as collapsible pistons and—by pumping in opposite directions—they’re able to deliver a continuous flow of venom,” said co-author Fiorella Ramirez-Esquivel of Macquarie University.
What's still developing
- Then they partially inserted those stingers into blocks of artificial gel and captured the pumping action using stereomicroscopy and high-speed color videography.
- The authors of this latest paper sought to capture the venom-pumping kinematics of honey bee stingers in order to identify the underlying biomechanics.
- Bees, wasps, and ants deliver venom via their stingers, either by contracting muscles around the venom reservoir or through stiff elements called lancets working together to pump venom.
- Honey Bee Stinger Revealed as Tiny Autonomous Double-Piston Venom Pump The honey bee sting is one of the most familiar minor injuries in the natural world, and yet the mechanism behind it has remained surprisingly mysterious for more than a century.
- The recordings, captured at 300 frames per second, revealed for the first time the complete pumping cycle of a structure barely two millimetres long, exposing a level of mechanical sophistication that the researchers describe as remarkable for such a tiny organ.
- Now a team of Australian researchers has captured the process in extraordinary detail, showing that the bee’s stinger is not a passive needle but a self-contained, self-powered micropump that keeps working even after it has been torn from the bee’s own body.
- When a worker honey bee stings a target with sufficiently elastic skin, she thrusts the stinger in and then flies away, leaving the entire stinging apparatus behind.
- It continues to work its way deeper into the tissue and keeps injecting venom under its own power, driven by the muscles, nerves and mechanical components packed into the tiny structure.
- Scientists have known since the early twentieth century that venom flows from a sac into a chamber equipped with small pumping elements, but the precise way those elements generate pressure has never been fully explained.
- New high-speed video shows the tiny barbed organ, left behind in the skin, continuing to drive itself deeper and pump venom on its own, powered by a pair of valves that behave like miniature pistons.
- The stinger of a worker honeybee, Apis mellifera, is about 2 millimeters (0.08 inch) long, according to a Macquarie University release on Scimex that includes the study's video clips.
- Scientists have known since at least 1910 that the venom sac empties into that chamber, which contains valves.