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Abstract: a- }% A: [" m$ C/ \
Aligned microcontact printing for patterning the sample in areas of homogeneous RF-field on the highly sensitive surface of planar& j3 o5 a: C( f# c$ W* e
NMR microprobes is presented. We experimentally demonstrate that sample patterning allows drastic improvement of the spin excitation
3 ?% w# {* Z" p* Buniformity. The NMR microprobes are designed for cell analysis and characterized using lipid vesicles as cell substitutes. Lipid vesicles
( ~& s' p/ _/ j4 Yare advantageous as composition and concentration of the confined solution are precisely controlled and because of their similarity
3 i( D: ?* R8 V/ H( O& uto living cells. Using aligned microcontact printing, a monolayer of lipid vesicles is immobilized on the surface of the planar NMR microprobe& s* H& s% z+ y+ |, L/ K
in a patterned way. 1H NMR spectra and CPMG spin echoes of sucrose solution confined within the lipid vesicles are successfully# h7 s6 W Z& U/ {" g: z
recorded. Nutation curves of the sample structured in different patterns demonstrate the impact of patterning on the spin excitation uniformity.; L: b m! l5 b. N9 [6 J9 N4 o# X4 l
The total detection volumes are between 1 and 2 nL and derived with help of a theoretic model based on 3D finite element simulation.7 E) \' C q7 d- `2 _* F! @
This model predicts the signal-to-noise ratio and the progression of the nutation curves.3 D: i: ?( w4 }
2005 Elsevier Inc. All rights reserved.9 ?" W! b$ i* _
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# j, F8 t' g4 s4 ^0 p% u[ 本帖最後由 mt7344 於 2007-6-7 10:38 PM 編輯 ] |
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