Two new arthropod toxins purified from the venom of the Mexican scorpion Centruroides nigrescens

Posted by
  Two new arthropod toxins purified from the venom of the Mexican scorpion Centruroides nigrescens Abstract The venom of the slender black scorpion Centruroides nigrescens , from the State of Guerrero México, was fractionated by Sephadex G–50 gel filtration, followed by carboxymethyl cellulose ion separation and high–performance liquid chromatography, permitting to obtain two new peptides toxic to arthropods. The estimate LD 50 of the soluble venom for the insect Acheta domesticus was 11.1 μg/g body weight, and for the arthropod Armadillidium vulgare was 61.1 μg body weight . The amino acid sequence of toxin Cnige1 (toxic to A. domesticus and A. vulgare ) contains 65 amino acids, with a molecular mass of 7273.37 mass units, whereas toxin Cnige2, toxic to A. domesticus , contains 68 amino acids, with a molecular mass of 7548.81 units. Both peptides are well packed, containing 8 cysteines, which in the native venoms are forming 4 disulfide bridges each. The amino acid sequences f...

Obituary: Rich Ayrey

Posted by

 


Obituary: Rich Ayrey

Below is additional information as posted on Jan Ove Reins' "The Scorpion Files Newsblog"

"Yesterday I got the sad news from multiple postings on Facebook that Rich Ayrey is no longer among us. Most, if not all of us in the scorpion community knew Rich. Either by personal communication or from his many important contributions in the taxonomy of the family Vaejovidae from Arizona and California.

Around 2011 I had the first contact with Rich when he generously shared some pictures of rare Vaejovis species for me to use in The Scorpion Files. Later he was very helpful by sending me new articles that he had published. And he always added some nice and supportive comments in his emails which I appreciated very much.

Rich will be missed by the scorpion comunity. 

My thoughts are with Rich's family and friends.

RIP

Jan Ove Rein
Editor of The Scorpion Files"