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Mole

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mus (mouse)

Definition

mus is the RTECS abbreviation for mouse. On some MSDS's, the abbreviation m may also be used.

mus is not a standard abbreviation "muscle" or "muscular". RTECS uses ims for "intramuscular".

Additional Info

mus appears on MSDS's in the context of a lethal or toxic dose concentration. Examples of such concentrations include LD50 and LC50 values as well as related terms such as TDLo (toxic dose, low), LDLo (lethal dose, low), and LCLo (lethal concentration, low). In the following examples from actual MSDS's, "mg/kg" refers to the specified quantity (in mg) of the test chemical per kilogram (kg) of animal body weight: Orl-mus LD50 >40 g/kg IPR-mus 7,548 mg/kg (inhalation, mus) ORL-MUS 4 mg kg-1 LD50:(IMS,MUS) 1190 MG In the examples above, ORL-MUS above refers to an oral exposure route in mice and (IMS,MUS) refers to intramuscular injection in mice.

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It is sometimes difficult to assess the relative risks of chemicals when one LD₅₀ is given for inhalation and another is given for injection. One has to consider the plausible routes of entry. For example, exposure to a vapor is much more likely through inhalation than through ingestion or injection.

MSDS Relevance

Animal test results do not always accurately assess the risks to humans, but even so, they are quite valuable for assessing the relative risks of chemicals in your workplace. The lower the LD₅₀ or related value, the more toxic the material.

Always read your MSDS to assess the hazards of a substance and to determine what engineering controls or personal protective equipment may be necessary to protect you from workplace exposure.

Further Reading

• Guide for the Care and Use of Laboratory Animals at National Academies Press.
• The Humane Society of the United States, strives to ensure that all animals are treated humanely.
• The Johns Hopkins Center For Alternatives To Animal Testing.
• How Much Does Animal Testing Tell Us? at Time magazine.

See also: molality, myalgia, subcutaneous.

Additional definitions from Google and OneLook.

Disclaimer: The information contained herein is believed to be true and accurate, however ILPI makes no guarantees concerning the veracity of any statement. Use of any information on this page is at the reader's own risk. ILPI strongly encourages the reader to consult the appropriate local, state and federal agencies concerning the matters discussed herein.