Monthly Archives: May 2018

Many dairy operations keep cow s milk for sale and use

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Many dairy operations keep cow’s milk for sale and use formula and feed to raise any calves. One farmer noticed that calves raised on the formula and feed needed to be treated for diarrhea more frequently than calves left with their mothers to nurse. He had some tests run on the diets and discovered no differences in the calories or nutritional content. The farmer called a veterinarian and asked him to explain the observations. What was the vet’s response?

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A filter capable of preventing bacteria from passing is placed

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A filter capable of preventing bacteria from passing is placed at the bottom of a U tube to separate the two sides. Streptomycin-resistant cells of a bacterial strain are placed on one side of the filter and streptomycin-sensitive cells are placed on the other side. After incubation, the side of the tube that originally contained only streptomycin-sensitive cells now contains some streptomycin-resistant cells. Give three possible reasons for this observation. What further experiments would you do to determine the correct explanation? Three possible reasons: 1. The streptomycin sensitive cells mutated to resistance. 2. The streptomycin sensitive cells were transformed to streptomycin resistance by DNA- mediated transformation 3. The streptomycin sensitive cells were transduced to streptomycin resistance by transduction

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Queueing models :A manufacturing process always has 8 parts in process.A part must successfully complete two steps (step 1 and step 2) to be completed.

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A manufacturing process always has 8 parts in process.A part must successfully complete two steps (step 1 and step 2) to be completed. A single machine performs step 1 and can process an average of 8 parts per minute. A single machine performs step 2 and can process 11 parts per minute. Unfortunately, step 2 is not totally reliable. (Step 1 is totally reliable, however.) Each time a part is sent through step 2, there is a 10% chance that step 2 must be repeated.
a) Find the steady-state distribution of parts at each machine.
b) Find the average number of parts at each machine.
c) Find the probability that each machine is busy.
d) Find the number of parts per minute successfully completing service at each machine.

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