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Monofunctionalized polyamide-based dendrimers containing either a terminal azide or alkyne moiety have been designed and synthesized via a convergent synthetic approach. The monofunctionalization allows for the single attachment of a functional moiety in quantitative yields by using 1,3-dipolar cycloadditions, thereby opening the possibility for targeted dendrimer functionalization. 相似文献
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A straightforward methodology for the synthesis of multifunctionalized dendrimers that is based on an orthogonal functionalization strategy has been developed. Polyamide-based dendrimers that possess both a single aldehyde and a single azide moiety on their periphery have been synthesized by using a convergent synthetic strategy. These dendrimers can be functionalized quantitatively with small organic and biological molecules that contain hydrazide and/or alkyne groups in which each functional moiety is completely specific for its complementary motif. This orthogonal functionalization strategy has the potential to be used to synthesize multifunctional dendrimers for a variety of applications, which range from targeted biological delivery vehicles to optical materials. 相似文献
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This article includes a proof of well posedness of an initial-boundary value problem involving a system of non-local parabolic partial differential equation (PDE), which naturally arises in the study of derivative pricing in a generalized market model, which is known as a semi-Markov modulated geometric Brownian motion (GBM) model We study the well posedness of the problem via a Volterra integral equation of second kind. A probabilistic approach, in particular the method of conditioning on stopping times is used for showing the uniqueness. 相似文献
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The authors present a simple channel model for diffuse infra-red indoor data communication systems. Based on the model, important trade-offs between the transmitted optical power, the bit-rate, and the receiver parameters are presented for the first time. 相似文献
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Dharker PN Gaikwad SM Suresh CG Dhuna V Khan MI Singh J Kamboj SS 《Journal of fluorescence》2009,19(2):239-248
Transitions in the tryptophan microenvironment and secondary structure of two monocot lectins from Sauromatum guttatum and Arisaema tortuosum under different denaturing conditions were studied by steady state and time resolved fluorescence and CD spectroscopy. The
lectins exist as tetramers with a single tryptophan residue estimated per monomer, present in a polar environment. Quenching
with ionic quenchers showed predominantly electropositive environment for tryptophan residues. Acrylamide had maximum quenching
effect. A decrease in KI quenching due to lectin denaturation indicated redistribution of charges as a result of possible
conformational change. The two values for lifetimes of tryptophanyl population (1.2–1.4 and 6.3–6.4 ns) reduced substantially
on quenching or denaturation. Similarly, both the lectins showed a drastic loss of secondary structure in 5 M Gdn-HCl or 6 M
Urea or at pH 2.0 and below. For the first time araceous lectins, like legume lectins are shown to bind adenine. The presence
of a compact structure at alkaline pH 10.0–12.0 was observed in CD spectra. 相似文献
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