characterization of the preformed polymers
Limitation
-cannot produce dense polymer brushes
-polymer thickness limit
Grafting from
‘‘Grafting-from’’ involves an in situ polymerization of an initiator functionalized surface with monomer.
Advantage
-can produce polymer brushes of high grafting density
-control over film thickness and composition
Limitation
-initiator
characterization of biological agents, being necessary to identify and detach the frequency shifts coming from the added mass and the stiffness changes.[10]
When working in the dynamic mode, the resolution of the system, Df, is determined by the quality factor, Q, following the expression △f=f/Q. The quality factor quantifies the energy dissipation and is defined as the ratio between the mec
In black, we hear a chain-gang chant, many voices together, spaced around the unison strike of picks against rock. A title burns in:
O muse!
Sing in me, and through me tell the story
Of that man skilled in all the ways of contending...
A wanderer, harried for years on end...
On the sound of an impact we cut to:
A PICK
splitting a rock.
As the chant continues, wider angles show the chain-gang at w
Enamel
√ Hard and white substance covering the teeth
√ The hardest and most highly mineralized
√ Protects the fragile underlying parts of the teeth
√ Covers the crown and supported by dentin
Component of enamel
√ 96% of enamel : mineral, water, organic material
√ contain two unique classes of proteins amelogenins and enamelins
√ The basic unit of enamel is called