The utility model discloses a novel powerful crusher comprising a stander, a rotor, a sieve plate and a material feeding inlet. The rotor comprises a main shaft, a plurality of strip-shaped hammer plates are sleeved on the main shaft, hammerhead shaft holes are formed at the symmetrical two ends of each strip-shaped hammer plate, a hammerhead shaft for mounting a hammerhead is sleeved in each hammerhead shaft hole;
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A self cleaving ribozyme was comprised of a hammerhead ribozyme and its target sequence located the downstream of the hammerhead ribozyme.
在锤头型核酶下游增加一段核酶作用的靶序列，使之成为自切割的核酶。
The scalloped hammerhead is under threat due to fishing pressures and in particular is a victim of shark finning.
由于捕食压力，特别是作为取鱼翅的牺牲品，锤头双髻鲨的生存受到威胁。
Shark Numbers can become depleted very quickly because they take a long time to mature - 16 years in the case of a scalloped hammerhead.
由于鲨鱼的成熟期很长，比如一头双髻鲨就需要16年，因此它们的总数很容易枯竭。
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