Early civilizations always formed near rivers/river deltas. Rivers provide water, silt (fertile soil) which is good for farming, and transportation, as well as natural barriers (such as the cataracts-rapids-in the Nile) which protected the Egyptians from invasions/attacks. The Nile is also predictable in it's seasonal flooding (compared to other early civilizations' rivers), which was good for the Egyptians.
(All of those factors influenced the development of the Egyptian civilization.)
Answer:
2. Bacteria that have a zone of inhibition are considered susceptible to the tested drug.
3. Bacteria that lack a zone of inhibition are resistant to the tested drug.
4. This test determines if a bacterium is resistant to a specific antibacterial drug.
Explanation:
The Kirby-Bauer test is a technique used in laboratories to assess the sensitivity of bacteria to antibiotics. This is one of the most reliable sensitivity tests in the world and is used in several areas such as health, agriculture, zoology, among others.
The test is done by applying antibiotic discs to a petri dish containing culture medium and a growing bacterium. When the bacterium grows inside the plate, it is observed whether the antibiotic discs were able to cause zones of inhibition of this growth.
Bacteria that do not have zones of inhibition are considered resistant to antibiotics, whereas bacteria that have zones of inhibition are considered susceptible.
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