What restorative materials are used on the following teeth?

Based on clinical and radiographic findings for this patient, and according to CAMBRA guidelines, the caries risk noted for this patient is incorrect.

MULTIPLE ANSWER: Select X1 and X3 Assume we want to detect the “path delay fault” for the given path that is shown with small arrows. Assume X2 signal is switching from logic 0 to logic 1. What should be the value of X1 and X3 during this switching to allow delay testing of given path? PATH-DELAY2.jpg

The Potomac River contains an average concentration of 55 ng/L of polychlorinated biphenyls (PCBs). Fish in the Potomac River are found to contain PCBs that they accumulate from water. Considering a bioconcentration factor (BCF) for PCBs of 1,500 L/kg in fish tissues relative to water, estimate the concentration of PCB in fish (in ng/kg) in the Potomac River. Considering a Maximum Daily Intake (TDI) of 20 ng/kg/day, estimate the maximum amount of fish (in g) that a 70-kg person can consume per week. Indicate the major steps of your calculations, so I can give you some credit even if your final answer is not correct.

What is type of pollutant transport is most likely to be significant in a fast running stream?

We discussed in class the case of the recent sewage spill in the Potomac River. Based on this discussion and the course material, answer the following questions: a. Give 3 contaminants that are likely to be found in sewage and be a thread for the environment. b. For each of the contaminant, indicate which is the mechanism by which it constitute an environmental thread. c. For one of these contaminant and a potential target organism, indicate what are the likely route(s) of exposure and sites of action, metabolism, and excretion (you may not know for sure, but you can make a guess).

Which of the following pollutants has been used as fuel additive for cars?

Which of the following toxicity endpoint is used to determine the reference dose?

What is the major type of interaction likely happening when dimethyl ether is mixed with water? 

Which of the following molecule is expected to have the highest Kow (octanol-water partition coefficient)?