1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
svet-max [94.6K]
3 years ago
14

An early method of evaluating the effectiveness of an antimicrobial chemical is to compare it's effectiveness to that of

Biology
1 answer:
Nimfa-mama [501]3 years ago
7 0

Answer:

The effectiveness of chemical disinfectants has historically been compared to phenol.

Explanation:

The effectiveness of a disinfectant or antiseptic can be determined in a number of ways. Historically, a chemical agent’s effectiveness was often compared with that of phenol, the first chemical agent used by Joseph Lister. In 1903, British chemists Samuel Rideal (1863–1929) and J. T. Ainslie Walker (1868–1930) established a protocol to compare the effectiveness of a variety of chemicals with that of phenol, using as their test organisms Staphylococcus aureus (a gram-positive bacterium) and Salmonella enterica serovar Typhi (a gram-negative bacterium). They exposed the test bacteria to the antimicrobial chemical solutions diluted in water for 7.5 minutes. They then calculated a phenol coefficient for each chemical for each of the two bacteria tested. A phenol coefficient of 1.0 means that the chemical agent has about the same level of effectiveness as phenol. A chemical agent with a phenol coefficient of less than 1.0 is less effective than phenol. An example is formalin, with phenol coefficients of 0.3 (S. aureus) and 0.7 (S. enterica serovar Typhi). A chemical agent with a phenol coefficient greater than 1.0 is more effective than phenol, such as chloramine, with phenol coefficients of 133 and 100, respectively. Although the phenol coefficient was once a useful measure of effectiveness, it is no longer commonly used because the conditions and organisms used were arbitrarily chosen.

You might be interested in
What would happen if a chemical interfered with the ability of RNA polymerase to bind to a DNA molecule
Helga [31]
Transcription would not take place and the protein would not be produced.
3 0
3 years ago
Read 2 more answers
Somebody can help me
mestny [16]

Answer:

I believe nRNA

Explanation:

every other rna on the list exists excpet for nRNA

4 0
2 years ago
Read 2 more answers
another man joins each end if the rope Dose this affect the results of the tug of war if not why or why not
Readme [11.4K]
Yes it does because it depends on how strong the man is on either end of the rope
7 0
3 years ago
However, bed bugs have become resistant to even this chemical pesticide. What happened that allowed the bug population to increa
juin [17]
D is the answer i think sorry if wrong

4 0
3 years ago
Read 2 more answers
What is an example of both a renewable and non-renewable resource????
Kobotan [32]

Answer:

Nonrenewable energy resources, like coal, nuclear, oil, and natural gas, are available in limited supplies. ... Renewable resources are replenished naturally and over relatively short periods of time. The five major renewable energy resources are solar, wind, water (hydro), biomass, and geothermal.

Explanation:

5 0
3 years ago
Other questions:
  • The variable that you measure is the :
    10·1 answer
  • How do organisms use different types of carbon compounds?
    9·1 answer
  • Percy wants to add more vitamins to his diet. He should eat more _____.
    11·2 answers
  • Tsunami waves flood coastal and inland areas and affect coastal life. Which of these properties of tsunami waves most contribute
    12·1 answer
  • Which of the following pairs of protists and their ecological roles are correctly matched?
    7·1 answer
  • Explain what happens to the mass during photosynthesis and cellular respiration
    6·1 answer
  • Compare and contrast aspergillosis and mucormycosis.
    14·1 answer
  • Chemical hand warmers come wrapped in plastic.
    7·1 answer
  • 21. What does “opt out” mean with regards to Europe’s organ donation policy?
    7·2 answers
  • What is mRNA?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!