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Now showing items 49 - 64 of 446

Vegetation and climate evolution during the Last Glaciation at Tengchong in Yunnan Province, Southwest China

Zhang, Jixiao Xu, Hai Gosling, William D. Lan, Jianghu Dodson, John Lu, Fengyan Yu, Keke Sheng, Enguo Liu, Bin

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Nanoribbons self-assembled from short peptides demonstrate the formation of polar zippers between β-sheets

Wang, Meng Wang, Jiqian Zhou, Peng Deng, Jing Zhao, Yurong Sun, Yawei Yang, Wei Wang, Dong Li, Zongyi Hu, Xuzhi King, Stephen M. Rogers, Sarah E. Cox, Henry Waigh, Thomas A. Yang, Jun Lu, Jian Ren Xu, Hai

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NANOSCALE CHARACTERIZATION BY SCANNING TUNNELING MICROSCOPY

XU, HAI XIE, XIAN NING ZILANI, M. A. K. CHEN, WEI WEE, ANDREW THYE SHEN

Nanoscale characterization is a key field in nanoscience and technology as it provides fundamental understanding of the properties and functionalities of materials down to the atomic and molecular scale. In this article, we review the development and application of scanning tunneling microscope (STM) techniques in nanoscale characterization. We will discuss the working principle, experimental setup, operational modes, and tip preparation methods of scanning tunneling microscope. Selected examples are provided to illustrate the application of STM in the nanocharacterization of semiconductors. In addition, new developments in STM techniques including spin-polarized STM (SP-STM) and multi-probe STM (MP-STM) are discussed in comparison with conventional non-magnetic and single tip STM methods.

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Research of the Surface Treatment Process of Bonded NdFeB Magnet with Composite Powder Electrostatic Spraying

Xiao, Kai Ye Xu, Hai Guo, Zhi Wei Zheng, Wen

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Hydrophobic-Region-Induced Transitions in Self-Assembled Peptide Nanostructures\r ^?

Xu, Hai Wang, Jing Han, Shuyi Wang, Jiqian Yu, Daoyong Zhang, Hongyu Xia, Daohong Zhao, Xiubo Waigh, Thomas A. Lu, Jian R.

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The diversity of glycosylation of cellobiohydrolase I from Trichoderma reesei determined with mass spectrometry

Wang, Mingyu Ma, Yanan Li, Ling Wang, Bianfang Wei, Xin Zhang, Mengge Wang, Juan Cui, Qingyu Li, Zhiqiang Xu, Hai

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Relationship between the Structural Conformation of Monoclonal Antibody Layers and Antigen Binding Capacity

Xu, Hai Zhao, Xiubo Lu, Jian R. Williams, David E.

Neutron reflection has been used to determine the pH-dependent structural conformation of monoclonal antibody layers adsorbed at the hydrophilic silicon oxide/solution interface, within the pH range 4-8, over which the silicon oxide surface carried weak negative charges and the net charge on the antibody reversed. The depth resolution achieved, by use of D(2)O as solvent to enhance the neutron contrast of the adsorbed antibody layer, was around 2-3 A. The results have been correlated with the ellipsometric measurement of antigen binding capacity (AgBC). The antibody was a mouse monoclonal anti-hCG (human chorionic gonadotropin) directed against the beta subunit of hCG, with molecular weight of 150 000 and isoelectric point around pH 6.0. At pH 4, the adsorbed antibody could be described as a single layer 40 angstrom thick, consistent with an almost perfect flat-on orientation with all three fragments (Fc, Fab) lying flat on the surface. With increasing pH, the antibody layer swelled (65 A at pH 6, 75 A at pH 8) and could be described as three sublayers of different protein density, consistent with some twisting of molecules so that some fragments became more loosely attached to the surface. At pH 8, the repulsive interaction between protein and surface was reflected in a significantly decreased total adsorbed amount. The dominant effect acting to increase AgBC was decreased surface packing density. The effect of the conformational changes revealed at different pH was less important. The results have shown that within the flat-on orientation adopted by the adsorbed antibody, steric hindrance is the main constraint on binding, restricting the access of the antigen to active sites within the antibody layer.

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Effect of micronutrients on algae in different regions of Taihu, a large, spatially diverse, hypereutrophic lake

Zhang, Xiaokai Li, Boling Xu, Hai Wells, Mona Tefsen, Boris Qin, Boqiang

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Controllable Synthesis of 2D and 1D MoS\r ₂\r Nanostructures on Au Surface

Xu, Hai Ding, Zijing Nai, Chang Tai Bao, Yang Cheng, Fang Tan, Sherman J. R. Loh, Kian Ping

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DNA Helicase RepA:? Cooperative ATPase Activity and Binding of Nucleotides\r ^?

Xu, Hai Frank, Joachim Niedenzu, Timo Saenger, Wolfram

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PUSH-TO-TALK MOBILE TERMINAL

A push-to-talk mobile terminal is disclosed, which includes a push-to-talk mobile terminal body. The mobile terminal also includes: a multifunctional interface socket and peripheral devices, wherein one end of the multifunctional interface socket is connected to the mobile terminal body and the other end is connected to the peripheral devices; the mobile terminal body includes a switch interface, by which the mobile terminal body is connected to the multifunctional interface socket; the peripheral devices include an external push-to-talk PTT keyboard for controlling the conversation of the push-to-talk mobile terminal. Thus, the provided push-to-talk mobile terminal facilitates using for users, guarantees the traffic safety, also can improve the conversation effect and is easy to carry.

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Oxygen vacancy enriched hollow cobaltosic oxide frames with ultrathin walls for efficient energy storage and biosensing

Hua, Li Hui, Zengyu Sun, Yue Zhao, Xi Xu, Hai Gong, Yujiao Chen, Ruyi Yu, Chenyang Zhou, Jinyuan Sun, Gengzhi Huang, Wei

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The Vibration Characteristic Research of the Transmission System of the Rolling Mill Based on Absolute Node Coordinates

Xu, Hai Shang, De Guang Li, Sheng Yong Gao, Li Xin

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Mitigating a global expansion of toxic cyanobacterial blooms: confounding effects and challenges posed by climate change

Paerl, Hans W. Havens, Karl. E. Hall, Nathan. S Otten, Timothy G. Zhu, Mengyuan Xu, Hai Zhu, Guangwei Qin, Boqiang

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A study of nonlinear coupling dynamic characteristics of the cold rolling mill system under different rolling parameters

Xu, Hai Cui, Ling-Li Shang, De-Guang

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The application of a halotolerant metalloprotease from marine bacterium Vibrio sp. LA-05 in liquid detergent formulations

Zhang, Hong Li, Hui Liu, Haoran Lang, Dietmar A. Xu, Hai Zhu, Hu

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Vegetation and climate evolution during the Last Glaciation at Tengchong in Yunnan Province, Southwest China

Nanoribbons self-assembled from short peptides demonstrate the formation of polar zippers between β-sheets

NANOSCALE CHARACTERIZATION BY SCANNING TUNNELING MICROSCOPY

Research of the Surface Treatment Process of Bonded NdFeB Magnet with Composite Powder Electrostatic Spraying

Hydrophobic-Region-Induced Transitions in Self-Assembled Peptide Nanostructures\r ^?

The diversity of glycosylation of cellobiohydrolase I from Trichoderma reesei determined with mass spectrometry

Relationship between the Structural Conformation of Monoclonal Antibody Layers and Antigen Binding Capacity

Effect of micronutrients on algae in different regions of Taihu, a large, spatially diverse, hypereutrophic lake

Controllable Synthesis of 2D and 1D MoS\r ₂\r Nanostructures on Au Surface

DNA Helicase RepA:? Cooperative ATPase Activity and Binding of Nucleotides\r ^?

PUSH-TO-TALK MOBILE TERMINAL

Oxygen vacancy enriched hollow cobaltosic oxide frames with ultrathin walls for efficient energy storage and biosensing

The Vibration Characteristic Research of the Transmission System of the Rolling Mill Based on Absolute Node Coordinates

Mitigating a global expansion of toxic cyanobacterial blooms: confounding effects and challenges posed by climate change

A study of nonlinear coupling dynamic characteristics of the cold rolling mill system under different rolling parameters

The application of a halotolerant metalloprotease from marine bacterium Vibrio sp. LA-05 in liquid detergent formulations

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