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Groups of Syrian golden hamsters were exposed by inhalation to benzo[a]pyrene (BP) in concentrations of 2.2, 9.5, and 45.6 mg/m3 air. Although 45.6 mg BP/m3 air was carcinogenic and toxic, 2.2 mg BP/m3 air led to no neoplastic response. The highest tumor incidence was seen in the group exposed to 9.5 mg BP/m3 air. Average survival times were similar in the(More)
Sulprofos, disulfoton, azinphos-methyl, methamidophos, trichlorfon, and tebupirimphos were screened for neurotoxic potential, in accordance with U.S. EPA (FIFRA) requirements. Each organophosphate was administered through the diet for 13 weeks to separate groups of Fischer 344 rats at four dose levels, including a vehicle control. For each study, 12(More)
In an inhalation study, two groups of male Syrian golden hamsters were exposed to 9.8 and 44.8 mg BP/m3 air respectively for 16 weeks. No significant histological or pathological alterations were seen, and no tumours were found which could be related to BP exposure.
KBR 3023, 1-(1-methyl-propoxycarbonyl)-2-(2-hydroxyethyl)piperidine, a prospective insect repellent being developed by Bayer Corporation, was evaluated for developmental toxicity in the Sprague-Dawley rat and Himalayan rabbit. As the intended human usage of the test compound is topical, the test systems were exposed to the compound via the dermal route.(More)
A comparison between human and porcine insulins with regard to their adsorption to administration sets was performed. A 125I-mono(A14)-iodinated insulin was used to follow the adsorption phenomenon over time and the adsorption was quantified with radioimmunoassays of unlabelled insulin. The obtained data were similar for both methods. No relevant difference(More)
The purpose of this study was to assess the embryotoxic, fetotoxic, and teratogenic potential of METASYSTOX-R (MSR) in the rat. Furthermore, the study was designed to determine if maternally toxic doses of MSR altered fetal brain acetylcholinesterase (AChE), compromised neonatal survival, growth, and development, or affected neurobehavioral development.(More)
N-(4-Fluorophenyl)-N-(1-methylethyl)-2-[[5-(trifluoromethyl)-1,3, 4-thiadiazol-2-yl]oxy]acetamide (FOE 5043) is a new acetanilide-type herbicide undergoing regulatory testing. Previous work in this laboratory suggested that FOE 5043-induced reductions in serum thyroxine (T4) levels were mediated via an extrathyroidal site of action. The possibility that the(More)
This study concerns the effect of spontaneous acquisition of alcohol drinking in rhesus monkeys on plasma levels of beta-endorphin, ACTH, prolactin, cortisol and testosterone. Twelve monkeys had free-choice access to water and two ethanol/water solutions (1%, 2%, v/v) for 4 weeks. During the first 2 weeks, six monkeys were injected (i.m.) twice daily with(More)
Male and female Sprague-Dawley rats were exposed to freshly generated polyurethane foam dusts, in concentrations averaging 8.65 mg/m3 air, for 6 hours daily 5 days a week over a period of 12 weeks. For comparison the same numbers of rats were exposed to titanium dioxide (TiO2) (15.95 mg/m3 air), which is a known inert dust, and to air alone, as controls for(More)