Considerable difficulty has been experienced in interpreting the results of toxicity tests on certain antibiotics employing aqueous solutionsas recommendedby various Pharmacopoeias. The strain of mice as a possible factor influencing the results has been emphasised. Ionic concentration of the solutions and the rate of injection are other factor~ considered responsible for the immediate mortalit...

ECO Update is a Bulletin series on ecological risk assessment of Superfund sites. These Bulletins serve as supplements to Risk Assessment Guidance for Superfund, Volume II: Environmental Evaluation Manual (EPA/540-1-89/001). The information presented is intended to provide technical information to EPA and other government employees. It does not constitute rulemaking by the Agency, and may not b...