Chapter 16, Problem 2MC

Biopharmaceutics and Pharmacokinetics:Two-Compartment Model Instant Absorption Questions Calculate these : a) B1,   b) B2,   c) hybrid rate constant (1) d) hybrid rate constant (2) e) t1/2,dist f) t1/2,elim   g) k10 h) k12 i) k21 j) initial concentration (C0)   k) central compartment volume (V1) l) steady-state volume (Vss)   m) clearance (CL)  AUC (0→10 min) using trapezoidal rule n)  AUC (20→30 min) using trapezoidal rule o) AUCtail (AUC360→∞)   p) total AUC (using short cut method) q) volume from AUC (VAUC)

Use the Henderson-Hasselbalch equation for a propanoic acid solution (CH₂CH₂CO₂H, pK₁ = 4.874) to calculate the quotient [A-]/[HA] at three different pH values. pH = 4.479 [A-] [HA] [A-] pH = 4.874 [HA] = pH = 5.220 [A-] = [HA]

In order to establish the expiration date of perishable food, growth curve data must be collected. Once the microbial load is so high that it poses a hazard to human health, the food item is no longer considered safe (expired). Generally a load of x50,000 bacteria/gram is considered unsafe. Your task is to determine the microbial growth curves for MicroYo, a new brand of yogurt. The growth is determined by sampling the yogurt and growing the bacterial isolates in broth culture which is then serially diluted by a total of x10,000 and inoculated onto standard petri plates of nutrient agar. The following colony counts are measured: Time (days) MicroYo colony count# 1 1 4 1 12 2 16 20 4 7 What day should you recommend expiring the yogurt (the last possible date before the microbial load is unsafe). 12 4 20 16