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In genetic engineering, a gene gun or biolistic particle delivery system is a device used to deliver exogenous DNA , RNA, or protein to cells. By coating particles of a heavy metal with a gene of interest and firing these micro-projectiles into cells using mechanical force, an integration of desired genetic information can be introduced into ...
An Affixing Machine is a machine that affixes postage stamps to an envelope, postcard or wrapper. [1] Affixing machines first appeared in the 1850s [2] but were not widely used until the early 20th century. [3] Stamp affixing machines were brought about by the need to mechanically affix stamps for bulk processing of mail. [4]
20 mm caliber is a specific size of popular autocannon ammunition. The dividing line between smaller-caliber weapons, commonly called "guns", from larger-caliber "cannons" (e.g. machine gun vs. autocannon), is conventionally taken to be the 20 mm round, the smallest caliber of autocannon.
However, the ZB-30 had some design differences, making it similar to the later ZGB-33, which was an early prototype of the Bren gun. [6] Like the ZB-26, the Wehrmacht adopted the ZB-30 after the occupation of Czechoslovakia, renaming it the MG30(t) ; it was used in the same role as the MG34 , as a light machine gun.
A particle-beam weapon uses a high-energy beam of atomic or subatomic particles to damage the target by disrupting its atomic and/or molecular structure. A particle-beam weapon is a type of space-based directed-energy weapon, which directs focused energy toward a target using atomic scale particles.
Researchers in Arizona say they have discovered the oldest gun in the U.S., a cannon used during the first European expedition across the Southwest. Blast from the past: Researchers discover ...
Later, the U.S. Army developed a higher-velocity 40 mm round using their high-low propulsion system for use by heavier machine gun-type grenade launchers found on vehicles and helicopters. Today, besides the U.S. military, the 40 mm grenade family is extremely popular and in use by armies worldwide and variants of it are in production by ...
As on the MG 42 family of machine guns, the belt is expelled to the right and spent cases are ejected downwards, although sideways ejection to the right is an option. The MG4 has a hammer-forged quick-change barrel that can be safely exchanged when hot without the need for protective gloves; the carrying handle serves as the barrel change grip.