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496 results on '"Li, Zi‐Chen"'

19. Security flaw of counterfactual quantum cryptography in practical setting

Author

Li, Yan-Bing, Wen, Qiao-Yan, and Li, Zi-Chen

Subjects
Quantum Physics
Abstract

Recently, counterfactual quantum cryptography proposed by T. G. Noh [Phys. Rev. Lett. 103, 230501 (2009)] becomes an interesting direction in quantum cryptography, and has been realized by some researchers (such as Y. Liu et al's [Phys. Rev. Lett. 109, 030501 (2012)]). However, we find out that it is insecure in practical high lossy channel setting. We analyze the secret key rates in lossy channel under a polarization-splitting-measurement attack. Analysis indicates that the protocol is insecure when the loss rate of the one-way channel exceeds $50%$., Comment: In this version, we changed some description

Published
2013

22. Synthesis and antibacterial properties of fluorinated biodegradable cationic polyesters.

Author

Li, Zhao-Yue, Zhang, Xiaoying, Qian, Yi-Lin, Du, Fu-Sheng, and Li, Zi-Chen

Abstract

Antimicrobial peptide-mimicking antibacterial polymers represent a practical strategy to conquer the ever-growing threat of antimicrobial resistance. Herein, we report the syntheses and antibacterial performance of degradable amphiphilic cationic polyesters containing pendent quaternary ammonium motifs and hydrophobic alkyl or fluoroalkyl groups. These polyesters were conveniently prepared from poly(3-methylene-1,5-dioxepan-2-one) via highly efficient one-pot successive thiol-Michael addition reactions. The antibacterial activity of these polyesters against S. aureus and E. coli and their hemolytic activity toward red blood cells were evaluated; some of them showed moderate antibacterial activity and selectivity against Gram-positive S. aureus. The membrane disruption mechanism of these cationic polyesters was briefly explored by monitoring the bacteria killing kinetics and SEM observations. Moreover, the effects of cationic/hydrophobic ratio and the incorporation of fluoroalkyl groups on the antibacterial activity and selectivity of the polyesters were demonstrated. [ABSTRACT FROM AUTHOR]

Published
2024
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32. Exerkine fibronectin type-III domain-containing protein 5/irisin-enriched extracellular vesicles delay vascular ageing by increasing SIRT6 stability

Author

Chi, Chen, primary, Fu, Hui, additional, Li, Yong-Hua, additional, Zhang, Guo-Yan, additional, Zeng, Fei-Yan, additional, Ji, Qing-Xin, additional, Shen, Qi-Rui, additional, Wang, Xu-Jie, additional, Li, Zi-Chen, additional, Zhou, Can-Can, additional, Sun, Di-Yang, additional, Fu, Jiang-Tao, additional, Wu, Wen-Bin, additional, Zhang, Ping-Ping, additional, Zhang, Jia-Bao, additional, Liu, Jian, additional, Shen, Fu-Ming, additional, Li, Dong-Jie, additional, and Wang, Pei, additional

Published
2022
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37. Fully Bio‐based Poly(ketal‐ester)s by Ring‐opening Polymerization of a Bicylcic Lactone from Glycerol and Levulinic Acid.

Author

Zhou, Tong, Meng, Xian‐Bin, Du, Fu‐Sheng, and Li, Zi‐Chen

Subjects
RING-opening polymerization, BENZYL alcohol, RANDOM copolymers, SMALL molecules, GLASS transition temperature, POLYESTERS, COPOLYMERS
Abstract

A fully renewable bio‐based bicyclic lactone containing a five‐membered cyclic ketal moiety, 7‐methyl‐3,8,10‐trioxabicyclo[5.2.1]decan‐4‐one (TOD), was synthesized through a two‐step acid‐catalyzed process from glycerol and levulinic acid. The ring‐opening polymerization (ROP) of TOD at 30°C with benzyl alcohol (BnOH) as the initiator and 1,5,7‐triazabicyclo[4.4.0]dec‐5‐ene (TBD) as the catalyst can afford high molar mass PTOD with a cis‐2.4‐disubstitued 2‐methyl 1,3‐dioxolane moiety in its repeating unit. PTOD is an amorphous polymer with a glass transition temperature (Tg) of 13°C. It can be hydrolyzed into structurally defined small molecules under acidic or basic conditions by the selective cleavage of either the cyclic ketal or the ester linkage respectively. The TBD‐catalyzed copolymerization of L‐lactide (L–LA) and TOD at −20°C was investigated. It was confirmed that L–LA polymerized quickly with racemization to form PLA, followed by a slow incorporation of TOD into the formed PLA chains via transesterification. By varying the feed ratios of L–LA to TOD, a series of random copolymers (PLA‐co‐PTOD) with different TOD incorporation ratios and tunable Tgs were obtained. Under acidic conditions, PLA‐co‐PTOD degrades much faster than PLA via the selective cleavage of the cyclic ketal linkages. This work provides insights for the development of more sustainable and acid‐accelerated degradable alternatives to aliphatic polyesters. [ABSTRACT FROM AUTHOR]

Published
2023
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