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Think about a grass that grows back to mid- phase in 15 days and low phase III in 30 days after grazing down to the minimum height for efficient re-growth and plant survival. It takes your little herd of lactating dairy water buffalo 3 days to reduce one of your […]

Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by calcium ions. However, calcium is more beneficial to human health than sodium. Calcium is a necessary part […]

A 25-year-old graduate student presents to the university health center complaining of acute shortness of breath. The patient states that he returned home yesterday from a non-stop flight from Sydney, Australia. Chest x-ray show multiple infiltrates. EKG is significant for tachycardia. This patient is a high risk for? Which ancillary […]

Serial dilutions are not only for bacteria. They can be used for any reagent. Suppose that in an experiment it is necessary to add 0.01 micro grams of DNA to a tube. Suppose that the concentration of DNA you have is 1 mg/ml. Describe how you could add 0.01 micro […]