Ferring Pharmaceuticals Research Associate Interview Questions, Process, and Tips

There are three stability conditions: asymptotic stability, bounded-input bounded-output stability, and Lyapunov stability.

• Asymptotic stability: System returns to a stable equilibrium point over time.

• Bounded-input bounded-output stability: System output remains bounded for bounded input signals.

• Lyapunov stability: System satisfies Lyapunov's direct method or Lyapunov's indirect method.

There are three types of stability zones: Zone I, Zone II, and Zone III. We are currently in Zone III.

• Zone I: Most stable, low risk of failure, typically used for long-term storage of products.

• Zone II: Intermediate stability, moderate risk of failure, used for products with moderate shelf life.

• Zone III: Least stable, high risk of failure, used for products with short shelf life or requiring special storage conditions.

Zeta Sizer is a device used to measure the electrophoretic mobility of particles in a liquid medium.

• Basic principle involves measuring the velocity of particles in an electric field.

• Unit of measurement is usually in zeta potential (mV).

• Range of measurement typically varies depending on the specific model of the Zeta Sizer.

• Common uses include studying colloidal stability, particle size distribution, and surface charge o

Solution Clarity Test is a test to determine the transparency of a solution.

• Solution Clarity Test is used to assess how clear or transparent a solution is.

• It is commonly performed in industries such as pharmaceuticals, food and beverage, and cosmetics.

• One common method to determine solution clarity is visual inspection against a light source.

• Another method is to use a spectrophotometer to measure the absorbance of ligh...read more