“金属风暴”与“毒蜘蛛”

“金属风暴”是一种一经击发,子弹便能够在一min内从36个枪管内发射100万发子弹的电子枪。这种“金属风暴”技术从本质上已经完全脱离了传统的弹道——发射技术,其基本操作系统百分之百由电路所控制,完全不受机械部分的束缚。 “金属风暴”武器系统的核心特征是在单个枪管内串联放置多个弹头,通过电子击发连续不断地将弹丸从枪管内“推”出来。

Isolation and characterization of Hainantoxin-II, a new neurotoxic peptide from the Chinese bird spider (Haplopelma hainanum)

Hainantoxin-II （HnTx-II）, a novel neurotoxin, was isolated from the venom of the Chinese bird spider （Haplopelma hainanum） by cation exchange chromatography and reverse-phase HPLC. The toxin was a single chain polypeptide with calculated molecular weight of 4 253.135 obtained by mass spectrometry. The complete amino acid sequence of HnTx-II was determined by Edman degradation and found to contain 37 residues with three disulfide bonds. Results showed HnTx-II can reversibly paralyze cockroaches for several hours after intra-abdominal injection with ED50 of 16 μg/g and kill the insects immediately at a dose of 60 μg/g. It was also shown to kill mice at a LD50 value of 1.41μg/g after intracerebroventricular injection. Hainantoxin-II shares 91% sequence homology with Huwentoxin-II （HwTx-II）, an insecticidal peptide from another bird spider （Haplopelma schmidti） with a unique scaffold. While HnTx-II and HwTx-II both exhibit toxic activities in insects and mammals, HnTx-II shows higher insecticidal activity and lower lethiferous activity of mammals than HwTx-II. These results help clarify structural-functional relationships of the polypeptide toxin.

引进[毒蜘蛛]级导弹艇对我海军影响重大

最近一段时间,国内外媒体大量报道了我国将从俄罗斯引进30艘“毒蜘蛛”级Ⅲ型导弹艇的消息。本文并不是证实这则消息是否属实,只是向读者介绍一下“毒蜘蛛”级导弹艇到底有哪些过人之处,以及如果引进它可能对我国海军产生哪些影响。“毒蜘蛛”级导弹艇是前苏联/俄罗斯在20世纪70年代末研制的一种大型近海导弹艇。作为除美国外唯一的全球性海军,前苏联在研制各型大中型水面舰艇的同时,也十分重视导弹艇这种小型舰艇的研制发展,并认为是海军整体作战力量中不可缺少的组成部分。因此,早在上世纪50年代就开始研制了多种型号、性能各异的数百艘导弹艇装备使用,除在本国大量装备外,还向世界其它国家出口了近百艘。“毒蜘蛛”级导弹艇目前俄海军应有30多艘在役,出口也达20多艘,成为接替“黄蜂”级导弹艇出口的主要艇型。