Multiple presentations reduce the behavioral impact of protected predator exposure in rats.

Exposure of rats to a predator species, such as a cat, or stimuli associated with a predator species has been used to model the effects of traumatic stress. We further investigated this procedure to determine if the behavioral effects from such exposure could be increased by multiple exposures. In rats (n=8 for each treatment group), we evaluated single (1×) and multiple (1×/day for 3 consecutive days [3×] and 2×/day for 3 consecutive days [6×]) exposures using cats and soiled cat litter.

Safety of administration of human butyrylcholinesterase and its conjugates with soman or VX in rats.

We evaluated the effects of conjugated enzyme-nerve agent product resulting from the inhibition of bioscavenger human serum butyrylcholinesterase (Hu BChE) by nerve agents soman or VX. Rats were trained on a multiple Fixed-Ratio 32, Extinction 30 sec. (FR32, Ext30) schedule of food reinforcement and then injected (i.

Assessment of low level whole-body soman vapor exposure in rats.

We evaluated biochemical and behavioral effects of single, low-level exposures to the chemical warfare nerve agent soman (GD). Male Sprague-Dawley rats were trained on a variable-interval, 56-sec schedule of food reinforcement (VI56). The schedule specifies that a single lever press, following an average interval of 56 s, produces food reinforcement (i.