After the bees receive a small jolt, they release some venom but retain their stingers.
Another series of laboratory-based experiments, carried out at Newcastle University, examined the behaviour of the bees.
In October, Hackenberg and his son trucked the bees down to Florida for the winter.
To help control mites in the bees, he uses a natural product based on thyme oil.
The Bees boss has also been impressed with the attitude his players have shown this season.
BBC: SPORT | Football | My Club | Brentford | Pratley enjoying Bees' good run
Hudson, 24, joined the Bees in the summer from Aldershot, but has made just four substitute appearances.
He agreed to help, and soon was sent some of the bees that van Engelsdorp had collected.
Substitute Ben May nearly doubled the Bees' lead seconds after coming on but screwed his shot wide.
Mark Hughes rewarded the Bees for their dominant play by putting them ahead on the half hour.
Meanwhile, the Bees have signed Australian youngster Todd Kurtz to take the number eight position in their squad.
Flower rich habitats are reducing and therefore nectar - essential to the bees survival is becoming more scarce.
To get the powder on to the bees, Exosect has produced traps that fit into the entrance of hives.
BBC: NEWS | Science/Nature | Sticky bees combat insect pests
The bees have minuscule claws on each of their feet that allow them to grab on to the cells.
Dr Papachristoforou recovered wax moth larvae that had been ejected from a hive, assuming the bees had killed them.
Jermaine Beckford and Phil Jagielka both missed their spot-kicks for the Toffees to give the Bees a famous win.
They were filled with young larvae, or brood, meaning that the bees, usually fiercely maternal, had abandoned their young.
The frames had all tumbled out, and the bees were buzzing around wildly.
The 18-year-old, who rides for Newport at both Premier and National League levels, will be the Bees' first-choice stand-by rider.
He suggested that the bees are delivering a complex set of instructions about how to find a rich nectar source.
BBC: NEWS | Science/Nature | Waggle dance leads bees to nectar
When the bees walk through the trap they pick up some of the powder which is then spread around the hive.
BBC: NEWS | Science/Nature | Sticky bees combat insect pests
It sounds as if when her parents told her about the birds and the bees, they never got to the mammals.
The home fans spilled on to the Griffin Park pitch moments after the Bees beat the Premier League side on penalties.
Nobody doubts IAPV is playing some role in the collapsing beehives, but that doesn't mean that IAPV is what's killing the bees.
Even the honey comes from the bees in the garden, with five or six beehives on the estate producing honey this year.
But by my reckoning, it's the stress that neither the bees nor the beekeepers have control over that is a major issue.
The bees were there because of me, and why I was there was a question I found myself unable to answer precisely.
It could get to the point where the bees are not sustainable.
Charlie MacDonald had a penalty saved for the home side in normal time but the Bees still managed to go on to win.
And beyond that, trying to keep a connection with the rest of life, too -- the birds, the bees, the rocks, things like that.
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