合成并表征了核苷官能化的多壁碳纳米管(N-MWCNT)。然后使用利用氢键相互作用的自组织过程来制造不含稳定剂,聚合物或表面活性剂的自组装N-MWCNTs膜。膜是使用简单的基于水分散的真空过滤方法生产的。氢键识别通过红外光谱和TEM图像分析得到确认。通过在氩气气氛下热处理除去有机部分,从而得到d-N-MWCNT,从而恢复N-MWCNTs膜中的电子传导性能。。电导率和热重分析(TGA)测量证实了退火工艺的效率。最后,使用辣根过氧化物酶(HRP)和低浓度的H 2 O 2对N-MWCNTs和d-N-MWCNTs膜进行氧化生物降解。我们的结果证实,官能团在HRP对CNT的生物降解中起着重要作用:N-MWCNTs膜被完全生物降解,而d-N-MWCNTs 膜未观察到降解,表明原始CNT经历了最小的酶催化氧化。这种新颖的方法为构建导电和可生物降解的碳纳米管膜提供了一种直接的超分子策略。
chemistry fromhydrogenabstraction to radical addition in the reaction of the radical SAM enzyme NosL. This change was achieved by using a substrate analogue containing an olefin moiety. We also showed that two SAM analogues containing different nucleoside functionalities initiate the radical‐based reactions with high efficiencies. The radical adduct with the olefin produced in the reaction was found
been proposed that arsenosugar biosynthesis involves a key intermediate 5′‐deoxy‐5′‐dimethylarsinoyl‐adenosine (DDMAA), but how DDMAA is produced remains elusive. Now, we report characterization of ArsS as a DDMAA synthase, which catalyzes a radical S‐adenosylmethionine (SAM)‐mediated alkylation (adenosylation) of dimethylarsenite (DMAsIII) to produce DDMAA. This radical‐mediated reaction is redox neutral
9-(4-Methoxyphenyl)xanthen-9-thiol: A useful reagent for the preparation of thiols
作者:Jonathan H. Marriott、Mina Mottahedeh、Colin B. Reese
DOI:10.1016/s0040-4039(00)88523-8
日期:1990.1
Treatment of 5' -chloro-5' -deoxynucleosides (5) with the conjugate base of 9-(4-methoxyphenyl)xanthen-9-thiol (3b), followed by acid-promoted removal of the 5'-s-[9-(4-methoxyphenyl)xanthen-9-yl] group in the presence of pyrrole gives the corresponding 5'-deoxy-5'-mercaptonucleosides (7) in good yields.
Reactions of 2-acyloxyisobutyryl halides with nucleosides. V. Reactions with cytidine and its derivatives
作者:Alan F. Russell、Miroslav Prystasz、Ernest K. Hamamura、Julien P. H. Verheyden、John G. Moffatt