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

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  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...

Two new species of Thrixopelma Schmidt, 1994 from Peru (Araneae: Theraphosidae)

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Two new species of Thrixopelma Schmidt, 1994 from Peru (Araneae: Theraphosidae)

Abstract
Two new species of Thrixopelma Schmidt, 1994 are described from Peru based on historic male specimens: Thrixopelma christineae sp. nov. and Thrixopelma eliseanneae sp. nov., both deposited in the Muséum national d'histoire naturelle, Paris. This work increases the diversity of this genus to ten, and the total number of congeners known from Peru to nine.

I would like to thank Danni Sherwood for forwarding this paper via ResearchGate.