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Ribonucleic acid (RNA) design offers unique opportunities for engineering genetic networks and nanostructures that self-assemble within living cells. Recent years have seen the creation of increasingly complex RNA devices, including proof-of-concept applications for in vivo three-dimensional scaffolding, imaging, computing, and control of biological behaviors. Expert intuition and simple design rules-the stability of double helices, the modularity of noncanonical RNA motifs, and geometric closure-have enabled these successful applications. Going beyond heuristics, emerging algorithms may enable automated design of RNAs with nucleotide-level accuracy but, as illustrated on a recent RNA square design, are not yet fully predictive. Looking ahead, technological advances in RNA synthesis and interrogation are poised to radically accelerate the discovery and stringent testing of design methods. 相似文献
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Chemical modification and protein engineering especially are now the useful tools for thermo-stabilizing proteins, and also for elucidating the mechanism of protein stability. The information on the mechanism so far accumulated indicate that a single or few amino acid replacement(s) in a protein is/are sufficient to enhance protein thermostability. Salt bridges inside protein molecule or decrease of internal or external hydrophobicity, respectively, may contribute to increased thermostability. However, generalized molecular reasons for protein thermostability and generalized methods for protein stabilization have not yet been proposed. Some of typical examples of the application of protein engineering to stabilize proteins are presented. They are based on information concerning the tertiary structure of the proteins or their related proteins. Even if such structural information is unavailable, one can replace amino acid(s) in a protein by mutagenesis of the gene coding for the protein via the application of chemicals to the gene (or the plasmid harbouring the gene) or organism. A promising strategy involving transfer of the identified gene into a thermophile and subsequent growth at higher temperatures (thermal adaptation) is described. 相似文献
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J P Saunders 《BMJ (Clinical research ed.)》1985,290(6474):1078-1079
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Sabrina Valetti Simona Mura Barbara Stella Patrick Couvreur 《Journal of nanobiotechnology》2013,11(Z1):S6
Nanomedicines have gained more and more attention in cancer therapy thanks to their ability to enhance the tumour accumulation and the intracellular uptake of drugs while reducing their inactivation and toxicity. In parallel, nanocarriers have been successfully employed as diagnostic tools increasing imaging resolution holding great promises both in preclinical research and in clinical settings. Lipid-based nanocarriers are a class of biocompatible and biodegradable vehicles that provide advanced delivery of therapeutic and imaging agents, improving pharmacokinetic profile and safety. One of most promising engineering challenges is the design of innovative and versatile multifunctional targeted nanotechnologies for cancer treatment and diagnosis. This review aims to highlight rational approaches to design multifunctional non liposomal lipid-based nanocarriers providing an update of literature in this field. 相似文献
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R. Quentin Grafton 《Reviews in Fish Biology and Fisheries》1996,6(1):5-20
The paper examines the theory and practice of individual transferable quotas (ITQs) in fisheries. Using the experience of several countries, a number of ITQ programmes are examined with respect to fisher compliance and their effect upon economic efficiency, employment, the harvesting shares of fishers, cost recovery and rent capture.
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种子萌发对策:理论与实验 总被引:7,自引:2,他引:7
植物种子的萌发/休眠现象有复杂的原因和机制,综述了理论生态学家的研究结果。应用的理论基础是最优化理论和进化稳定对策(Ess)理论。当环境条件随机波动,种群受非密度依赖因素调节时,采用最优化理论的两头下注对策预测休眠一定会得到进化且萌发率与环境条件直接相关。环境条件稳定时采用进化稳定对策理论可得到在亲属竞争,种子扩散,基因冲突等等因素影响下的进化稳定休眠/萌发率,预测了休眠/萌发与它们之间的相互关系。以上各种环境条件影响种子萌发行为的方式可以表述为若种子立即萌发会遭遇到不良环境使适合度下降,那么就会推迟萌发,出现休眠,形成土壤种子库。萌发率应使种群适合度最优或具有进化稳定性。一些实验也部分验证了理论预测。 相似文献
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J K Aronson 《BMJ (Clinical research ed.)》1985,290(6467):487-488
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在论述蛋白工程基本概念和定义的基础之上,介绍了蛋白质工程的主要内容,着重介绍了基因重组和分子生物学等贩新技术在蛋白工程的应用,最后还介绍了蛋白质工程在生物制药方面的应用情况。 相似文献
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