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264 results on '"Dai, Luru"'

4. Water-immersion supercritical metalens

Author

Zhou, Junzheng, Zhou, Yi, Dong, Fengliang, Zhang, Kun, Xu, Lihua, Song, Zhiwei, Shang, Zhengguo, Liang, Gaofeng, Zhang, Zhihai, Wen, Zhongquan, Dai, Luru, Chu, Weiguo, and Chen, Gang

Published
2023
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7. Super-Resolution Microscopy as a Versatile Tool in Probing Molecular Assembly.

Author

Sun, Nan, Bai, Shiwei, Dai, Luru, and Jia, Yi

Subjects
MOLECULAR probes, MOLECULAR structure, MOLECULAR dynamics, MOLECULAR interactions, NANOTECHNOLOGY
Abstract

Molecular assembly is promising in the construction of advanced materials, obtaining structures with specific functions. In-depth investigation of the relationships between the formation, dynamics, structure, and functionality of the specific molecular assemblies is one of the greatest challenges in nanotechnology and chemistry, which is essential in the rational design and development of functional materials for a variety of applications. Super-resolution microscopy (SRM) has been used as a versatile tool for investigating and elucidating the structures of individual molecular assemblies with its nanometric resolution, multicolor ability, and minimal invasiveness, which are also complementary to conventional optical or electronic techniques that provide the direct observation. In this review, we will provide an overview of the representative studies that utilize SRM to probe molecular assemblies, mainly focusing on the imaging of biomolecular assemblies (lipid-based, peptide-based, protein-based, and DNA-based), organic–inorganic hybrid assemblies, and polymer assemblies. This review will provide guidelines for the evaluation of the dynamics of molecular assemblies, assembly and disassembly processes with distinct dynamic behaviors, and multicomponent assembly through the application of these advanced imaging techniques. We believe that this review will inspire new ideas and propel the development of structural analyses of molecular assemblies to promote the exploitation of new-generation functional materials. [ABSTRACT FROM AUTHOR]

Published
2024
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10. A constant extension ensembles model of double-stranded chain molecules

Author

Liu, Fei, Dai, Luru, Xu, Tao, and Ou-Yang, Zhong-can

Subjects
Condensed Matter - Soft Condensed Matter, Condensed Matter - Disordered Systems and Neural Networks, Quantitative Biology
Abstract

Because the constant extension ensemble of single chain molecule is not always equivalent with constant force ensemble, a model of double-stranded conformations, as in RNA molecules and $\beta$-sheets in proteins, with fixed extension constraint is built in this paper. Based on polymer-graph theory and the self-avoiding walks, sequence dependence and excluded-volume interactions are explicitly taken into account. Using the model, we investigate force-extension curves, contact distributions and force-temperature curves at given extensions. We find that, for the same homogeneous chains, the force-extension curves are almost consistent with the extension-force curves in the conjugated force ensembles. Especially, the consistence depends on chain lengths. But the curves of the two ensembles are completely different from each other if sequences are considered. In addition, contact distributions of homogeneous sequence show that the double-stranded regions in hairpin conformations tend to locate at two sides of the chain. We contribute the unexpected phenomena to the nonuniformity of excluded-volume interactions of the region and two tails with different lengths. This tendency will disappear if the interactions are canceled. Finally, in constant extension ensemble, the force-flipping transitions conjugated with re-entering phenomena in constant force ensemble are observed in hairpin conformations, while they do not present in secondary structure conformations., Comment: 15 pages, 24 figures

Published
2002

11. Maximum-entropy calculation of end-to-end distance distribution of force stretching chains

Author

Dai, Luru, Liu, Fei, and Ou-Yang, Zhong-can

Subjects
Condensed Matter - Soft Condensed Matter
Abstract

Using the maximum-entropy method, we calculate the end-to-end distance distribution of the force stretched chain from the moments of the distribution, which can be obtained from the extension-force curves recorded in single-molecule experiments. If one knows force expansion of the extension through the $(n-1)$th power of force, it is enough information to calculate the $n$ moments of the distribution. We examine the method with three force stretching chain models, Gaussian chain, free-joined chain and excluded-volume chain on two-dimension lattice. The method reconstructs all distributions precisely. We also apply the method to force stretching complex chain molecules: the hairpin and secondary structure conformations. We find that the distributions of homogeneous chains of two conformations are very different: there are two independent peaks in hairpin distribution; while only one peak is observed in the distribution of secondary structure conformations. Our discussion also shows that the end-to-end distance distribution may discover more critical physical information than the simpler extension-force curves can give., Comment: 13 pages, 14 figures

Published
2002
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12. A model for the force stretching double-stranded chain molecules

Author

Liu, Fei, Dai, Luru, and Ou-Yang, Zhong-can

Subjects
Condensed Matter - Soft Condensed Matter, Quantitative Biology
Abstract

We modify and extend the recently developed statistical mechanical model for predicting the thermodynamic properties of chain molecules having noncovalent double-stranded conformations, as in RNA or ssDNA, and $\beta-$sheets in protein, by including the constant force stretching at one end of molecules as in a typical single-molecule experiment. The conformations of double-stranded regions of the chain are calculated based on polymer graph-theoretic approach [S-J. Chen and K. A. Dill, J. Chem. Phys. {\bf109}, 4602(1998)], while the unpaired single-stranded regions are treated as self-avoiding walks. Sequence dependence and excluded volume interaction are taken into account explicitly. Two classes of conformations, hairpin and RNA secondary structure are explored. For the hairpin conformations, all possible end-to-end distances corresponding to the different types of double-stranded regions are enumerated exactly. For the RNA secondary structure conformations, a new recursive formula incorporating the secondary structure and end-to-end distribution has been derived. Using the model, we investigate the extension-force curves, contact and population distributions and re-entering phenomena, respectively. we find that the force stretching homogeneous chains of hairpin and secondary structure conformations are very different: the unfolding of hairpins is two-state, while unfolding the latter is one-state. In addition, re-entering transitions only present in hairpin conformations, but are not observed in secondary structure conformations., Comment: 19 pages, 28 figures

Published
2002
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13. Generating a Superoscillation Three-Dimensional Hollow Spot by Polarization Manipulation

Author

Wang, Jinlong, primary, Dong, Fengliang, additional, Zhang, Kun, additional, Zhou, Yi, additional, Song, Zhiwei, additional, Hu, Haifeng, additional, Xu, Lihua, additional, Jiang, Hai, additional, Liang, Gaofeng, additional, Zhang, Zhihai, additional, Wen, Zhong-quan, additional, Liu, Yufei, additional, Shang, Zhengguo, additional, Dai, Luru, additional, Chu, Weiguo, additional, and Chen, Gang, additional

Published
2023
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14. Generating Ultralong-Superoscillation Nondiffracting Beams with Full Control of the Intensity Profile

Author

Zhang, Kun, primary, Jiang, Hai, additional, Dong, Fengliang, additional, Hu, Haifeng, additional, Song, Zhiwei, additional, Xu, Lihua, additional, Shang, Zhengguo, additional, Liang, Gaofeng, additional, Zhang, Zhihai, additional, Wen, Zhongquan, additional, Zhou, Yi, additional, Dai, Luru, additional, Chu, Weiguo, additional, and Chen, Gang, additional

Published
2023
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19. Flat-field superoscillation metalens

Author

Liao, Dingpeng, primary, Dong, Fengliang, additional, Zhang, Kun, additional, Zhou, Yi, additional, Liang, Gaofeng, additional, Zhang, Zhihai, additional, Wen, Zhongquan, additional, Shang, Zhengguo, additional, Chen, Gang, additional, Dai, Luru, additional, and Chu, Weiguo, additional

Published
2022
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20. Water-Immersion Superoscillation Metalens

Author

Zhou, Junzheng, primary, Zhou, Yi, additional, Dong, Fengliang, additional, Zhang, Kun, additional, Xu, Lihua, additional, Song, Zhiwei, additional, Shang, Zhengguo, additional, Liang, Gaofeng, additional, Zhang, Zhihai, additional, Wen, Zhongquan, additional, Dai, Luru, additional, Chu, Weiguo, additional, and Chen, Gang, additional

Published
2022
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24. Holographic Super-Resolution Metalens for Achromatic Sub-Wavelength Focusing

Author

Dai, Xuemei, primary, Dong, Fengliang, additional, Zhang, Kun, additional, Liao, Dingpeng, additional, Li, Sheng, additional, Shang, Zhengguo, additional, Zhou, Yi, additional, Liang, Gaofeng, additional, Zhang, Zhihai, additional, Wen, Zhongquan, additional, Chen, Gang, additional, Dai, Luru, additional, and Chu, Weiguo, additional

Published
2021
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33. An extravascular fluid transport system based on structural framework of fibrous connective tissues in human body

Author

Li, Hongyi, primary, Yang, Chongqing, additional, Yin, Yajun, additional, Wang, Fang, additional, Chen, Min, additional, Xu, Liang, additional, Wang, Naili, additional, Zhang, Di, additional, Wang, Xiaoxia, additional, Kong, Yiya, additional, Li, Qing, additional, Su, Si, additional, Cao, Yupeng, additional, Liu, Wentao, additional, Ao, Zhuo, additional, Dai, Luru, additional, Ma, Chao, additional, Shang, Lijun, additional, Han, Dong, additional, Ji, Fusui, additional, and Li, Hua, additional

Published
2019
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45. Caged progesterone: a new tool for studying rapid nongenomic actions of progesterone

Author

Kilic, Funda, Kashikar, Nachiket D., Schmidt, Reinhard, Alvarez, Luis, Dai, Luru, Weyand, Ingo, Wiesner, Burkhard, Goodwin, Normann, Hagen, Volker, and Kaupp, U. Benjamin

Subjects
Coumarins -- Structure, Coumarins -- Chemical properties, Progesterone -- Chemical properties, Progesterone -- Structure, Ultraviolet radiation -- Usage, Chemistry
Abstract

Ketalization of the biomolecule progesterone with (6-bromo-7-hydroxycoumarin-4-yl)ethane-1,2-diol has given the photolabile progesterone derivatives and has displayed reduced bioactivity and release progesterone upon irradiation with ultraviolet/visible or infrared light. The utility of the derivative is shown by measurement of changes in swimming behavior of single human sperm caused by progesterone-induced [Ca.sup.2+]-influx in the sperm flagellum.

Published
2009

48. Self-Assembly of Ultralong Aligned Dipeptide Single Crystals

Author

Sun, Bingbing, primary, Li, Qi, additional, Riegler, Hans, additional, Eickelmann, Stephan, additional, Dai, Luru, additional, Yang, Yang, additional, Perez-Garcia, Rodrigo, additional, Jia, Yi, additional, Chen, Guoxiang, additional, Fei, Jinbo, additional, Holmberg, Krister, additional, and Li, Junbai, additional

Published
2017
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