Biomaterial Database

[Behavioral changes in the rats following inhalation of mercury vapor (author's transl)]. 1978

R Kishi

The present study was designed to determine critical brain mercury concentrations associated with specific behavioral changes during exposure to mercury vapor. Rats exposed to 3 mg of Hg/m3 for 3 hours, 5 days per week, for 15-42 weeks, showed a decline in conditioned avoidance response. The latency of escape response also increased in pole climb shock escape. The time to the onset of effects varied from 12 to 39 weeks among 14 rats exposed to mercury. All rats recovered to preexposure baseline within 12 weeks after the termination of exposure. A significantly poor behavioral performance was noticed in rats with brain mercury concentration of approximately 20 microgram Hg/g. Behavioral recovery was seen when the mercury concentrations decreased to 10 microgram Hg/g brain tissue. These results suggest that the critical concentration of inorganic mercury in the brain associated with behavioral changes in the rat ranges about 10 ppm to 20 ppm. In spite of the high concentration of mercury, the nervous tissues of rats in this experiment with mercury vapor intoxication were normal.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008628	Mercury	A silver metallic element that exists as a liquid at room temperature. It has the atomic symbol Hg (from hydrargyrum, liquid silver), atomic number 80, and atomic weight 200.59. Mercury is used in many industrial applications and its salts have been employed therapeutically as purgatives, antisyphilitics, disinfectants, and astringents. It can be absorbed through the skin and mucous membranes which leads to MERCURY POISONING. Because of its toxicity, the clinical use of mercury and mercurials is diminishing.
D008630	Mercury Poisoning	Poisoning that results from chronic or acute ingestion, injection, inhalation, or skin absorption of MERCURY or MERCURY COMPOUNDS.	Poisoning, Mercury,Mercury Poisonings,Poisonings, Mercury
D001921	Brain	The part of CENTRAL NERVOUS SYSTEM that is contained within the skull (CRANIUM). Arising from the NEURAL TUBE, the embryonic brain is comprised of three major parts including PROSENCEPHALON (the forebrain); MESENCEPHALON (the midbrain); and RHOMBENCEPHALON (the hindbrain). The developed brain consists of CEREBRUM; CEREBELLUM; and other structures in the BRAIN STEM.	Encephalon
D001923	Brain Chemistry	Changes in the amounts of various chemicals (neurotransmitters, receptors, enzymes, and other metabolites) specific to the area of the central nervous system contained within the head. These are monitored over time, during sensory stimulation, or under different disease states.	Chemistry, Brain,Brain Chemistries,Chemistries, Brain
D003214	Conditioning, Classical	Learning that takes place when a conditioned stimulus is paired with an unconditioned stimulus.	Reflex, Conditioned,Classical Conditioning,Classical Conditionings,Conditioned Reflex,Conditionings, Classical
D004781	Environmental Exposure	The exposure to potentially harmful chemical, physical, or biological agents in the environment or to environmental factors that may include ionizing radiation, pathogenic organisms, or toxic chemicals.	Exposure, Environmental,Environmental Exposures,Exposures, Environmental
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D001362	Avoidance Learning	A response to a cue that is instrumental in avoiding a noxious experience.	Aversion Behavior,Aversion Learning,Aversive Behavior,Aversive Learning,Avoidance Behavior,Aversion Behaviors,Aversive Behaviors,Avoidance Behaviors,Behavior, Aversion,Behavior, Aversive,Behavior, Avoidance,Behaviors, Aversion,Behaviors, Aversive,Behaviors, Avoidance,Learning, Aversion,Learning, Aversive,Learning, Avoidance
D014835	Volatilization	A phase transition from liquid state to gas state, which is affected by Raoult's law. It can be accomplished by fractional distillation.	Vaporization,Volatility