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排序方式: 共有62条查询结果,搜索用时 978 毫秒
21.
A model that preserves the known thermodynamic properties of double stranded DNA is introduced to study the formation of more complex DNA constructions, such as small origamis or Holliday junctions. We show that the thermodynamic behaviour of these complex DNA constructions is not only given by their sequence but also by their topology. 相似文献
22.
Simon A Cohen-Bouhacina T Porté MC Aimé JP Baquey C 《Journal of colloid and interface science》2002,251(2):278-283
In order to establish a 3-aminopropyltriethoxysilane (APTES) grafting procedure with limited number of APTESs noncovalently linked to the silica surface, two different methods of grafting (in acid-aqueous solution and in anhydrous solution) were compared. The grafted surface state was investigated by atomic force microscopy (AFM). The stability of the grafting was checked at different temperatures by AFM. Continuous and plane APTES grafted surfaces were successfully prepared using both grafting preparations. The grafting in an anhydrous solution behaves homogeneously and stably compared to the grafting in an acid-aqueous solution. Moreover, with anhydrous solution, results showed that a unique monolayer of APTES was grafted. 相似文献
23.
Liquid mechanical behavior of mixed monolayers of amino and alkyl silanes by atomic force microscopy
Martin P Marsaudon S Thomas L Desbat B Aimé JP Bennetau B 《Langmuir : the ACS journal of surfaces and colloids》2005,21(15):6934-6943
The adsorption of mixed terminally aminated organosilyl compounds with long-chain n-alkyltrichlorosilanes on silica substrates has been studied by FTIR and AFM to deposit and study DNA. By optimization of deposition conditions, the mixed monolayers were found to be well organized and homogeneous. The amino group was protected to obtain a reproducible grafting and then deprotected after the film formation. In addition, atomic force microscopy (AFM) studies in both dynamical modes, amplitude modulation and frequency modulation, reveal that the layer behaves as a fluid as measured by the tip-cantilever and has a smaller characteristic time than the tip-cantilever. For three amplitudes, the experimental frequency shifts have been modeled for a fluidlike layer crossed by the tip. Finally, we show that this new fluidlike monolayer is suitable for DNA deposition and AFM studies. 相似文献
24.
Squaric acid 1 reacts with equimolar amounts of tertiary amines 7 and tertiary phosphines 8 in acetic anhydride to afford the monocondensation-products 4 and 5 , respectively. 相似文献
25.
Modulating Cell‐Surface Receptor Signaling and Ion Channel Functions by In Situ Glycan Editing 下载免费PDF全文
Dr. Hao Jiang Dr. Aimé López‐Aguilar Dr. Lu Meng Dr. Zhongwei Gao Dr. Yani Liu Xiao Tian Prof. Guangli Yu Dr. Ben Ovryn Prof. Kelley W. Moremen Prof. Peng Wu 《Angewandte Chemie (International ed. in English)》2018,57(4):967-971
Glycans anchored on cell‐surface receptors are active modulators of receptor signaling. A strategy is presented that enforces transient changes to cell‐surface glycosylation patterns to tune receptor signaling. This approach, termed in situ glycan editing, exploits recombinant glycosyltransferases to incorporate monosaccharides with linkage specificity onto receptors in situ. α2,3‐linked sialic acid or α1,3‐linked fucose added in situ suppresses signaling through epidermal growth factor receptor and fibroblast growth factor receptor. We also applied the same strategy to regulate the electrical signaling of a potassium ion channel–human ether‐à‐go‐go‐related gene channel. Compared to gene editing, no long‐term perturbations are introduced to the treated cells. In situ glycan editing therefore offers a promising approach for studying the dynamic role of specific glycans in membrane receptor signaling and ion channel functions. 相似文献
26.
Journal of Solution Chemistry - 相似文献
27.
设2≤h≤3,l0,k≥0是整数,C_h(l,k)是由h-边连通简单图组成的集合,图G∈C_h(l,k)当且仅当对图G的任意一个二边割或三边割X,图G-X的每个分支都至少有︱V(G)-k︱/l个点.设e=u_1v_1和e'=u_2v_2是图G的两条边.若e≠e',G(e,e')是将图G中的边e=u_1v_1和e'=u_2v_2分别用路u_1v_ev_1和u_2v_e'v_2替换得到的图(其中,v_e,v_e'是不在V(G)中的两个新的点).若e=e',G(e,e')是将图G中的边e=u_1v_1用路u_1v_ev_1替换得到的图,也记作G(e).若对任意的e,e'∈E(G),G(e,e')都有支撑(v_e,v_e')迹,则称图G是强支撑可迹的.作者证明了,若图G∈C_2(4,k)且|V(G)|5k,则要么图G是强支撑可迹图,要么存在e,e'∈E(G),使得G(e,e')可以收缩成一个有限图类F中的图.当k=4时,F被完全确定了. 相似文献
28.
L. Nony R. Boisgard J.-P. Aimé 《The European Physical Journal B - Condensed Matter and Complex Systems》2001,24(2):221-229
This work is a theoretical investigation of the stability of the non-linear behavior of an oscillating tip-cantilever system
used in dynamic force microscopy. Stability criterions are derived that may help to a better understanding of the instabilities
that may appear in the dynamic modes, Tapping and NC-AFM, when the tip is close to a surface. A variational principle allows
to get the temporal dependence of the equations of motion of the oscillator as a function of the non-linear coupling term.
These equations are the basis for the analysis of the stability. One find that the branch associated to frequencies larger
than the resonance is always stable whereas the branch associated to frequencies smaller than the resonance exhibits two stable
domains and one unstable. This feature allows to re-interpret the instabilities appearing in Tapping mode and may help to
understand the reason why the NC-AFM mode is stable.
Received 12 April 2001 相似文献
29.
René Carmona François Delarue Aimé Lachapelle 《Mathematics and Financial Economics》2013,7(2):131-166
We discuss and compare two investigation methods for the asymptotic regime of stochastic differential games with a finite number of players as the number of players tends to the infinity. These two methods differ in the order in which optimization and passage to the limit are performed. When optimizing first, the asymptotic problem is usually referred to as a mean-field game. Otherwise, it reads as an optimization problem over controlled dynamics of McKean–Vlasov type. Both problems lead to the analysis of forward–backward stochastic differential equations, the coefficients of which depend on the marginal distributions of the solutions. We explain the difference between the nature and solutions to the two approaches by investigating the corresponding forward–backward systems. General results are stated and specific examples are treated, especially when cost functionals are of linear-quadratic type. 相似文献
30.
Aimé Lachal 《Journal of Theoretical Probability》2006,19(4):757-771
Let (B
t
)
t≥ 0 be standard Brownian motion starting at y and set X
t
= for , with V(y) = y
γ if y≥ 0, V(y) = −K(−y)γ if y≤ 0, where γ and K are some given positive constants. Set . In this paper, we provide some formulas for the probability distribution of the random variable as well as for the probability (or b)}. The formulas corresponding to the particular cases x = a or b are explicitly expressed by means of hypergeometric functions.
相似文献