Phosphonium bis-zwitterions based on bis-2-cyanoacrylates are weak reversible inhibitors of choline esterases with a diverse anticholine esterase effect. This can find use in additional classification of choline esterases.

The design and construction of a 90' electrostatic prism is described. The device is used to deflect hypervelocity dust particles produced in a horizontal van der Graaff accelerator to simulate micrometeroid impacts on dusty lunar and asteroidal surfaces where vertical incidence must be provided.

Anticholine Esterase Activity of Phosphonium Bis-zwitterions Based on 2-Cyanoacrylates. -Phosphonium bis-betaines (III) based on 2-cyanoacrylates are synthesized and evaluated as inhibitors of choline esterase. The compounds (III) show a weak inhibition effect on choline esterases from various sources. -(ZHUKOVSKII, YU. G.; KUZNETSOVA, L. P.; SOCHILINA, E. E.; BYKOVSKAYA, E. YU.; KRYLOVA, T. O.; KOLOMNIKOVA, G. D.; GOLOLOBOV, YU. G.; Russ.

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The ability of the localizing system of the dolphin Tursiops truncatus to discriminate the dynamic characteristics of an object being located (a radially moving target) was studied. Measurements were made of the thresholds of the animals' sensitivity to the target speed (2.6 cm/sec) and acceleration (0.6 cm/sec(2)). For location of a target moving at constant speed, dolphins were found to use probe signals consisting of two impulses, while accelerating targets were located using probe signals consisting of three impulses. These characteristics were used to propose new and highly effective technical methods for hydrolocation and radiolocation.