The answer is B. Continental Drift (Confidently)
Answer:
1) 0.391 mg 2) By resizing the semi-permeable membrane and reducing the saturated drug concentration from 100% to 60% (i.e. from to ).
Explanation:
1) The total amount of released drug at time 't' is:
Where:
H is the length of the device = 1 cm,
D is the diffusion coefficient of the drug
K is the partition coefficient = 10
is the saturated drug concentration in the polymer matrix
is the radius of the device = 250 μm
is the radius of the cylindrical space = 100 μm
t is the released time = 48*3600 s = 172800 s
Therefore:
2) For a membrane-controlled device, the released rate can be controlled (i.e. decrease or increase) by resizing the semi-permeable membrane. In addition, the saturated drug concentration should be reduced from 100% to 60% (i.e. from to )
Answer:
You didn't provide any options but from this, choose the answer in your options.
DNA has a double helix structure. It creates an extremely thin spiral that can not be seen to the naked human eye. It contains sugar and phosphate molecules. The spiral contains colored nitrogenous bases.
Answer:
A
Explanation:
They are all found in the reactants side
Answer:
Sublimation and evaporation are similar in that they are both phase changes where a substance changes to a gas...but that's where the similarity ends. Sublimation comes from a solid changing to a gas, and evaporation is liquid changing to a gas.
Explanation: