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| 1 | Error suppression techniques for energy-efficient high-resolution SAR ADCs显示文摘The successive approximation register(SAR)is one of the most energy-efficient analog-to-digital converter(ADC)architecture for medium-resolution applications.However,its high energy efficiency quickly diminishes when the target resolution increases.This is because a SAR ADC suffers from several major error source,including the sampling kT/C noise,the comparator noise,and the DAC mismatch.These errors are increasing hard to address in high-resolution SAR ADCs.This paper reviews recent advances on error suppression techniques for SAR ADCs,including the sampling kT/C noise reduction,the noise-shaping(NS)SAR,and the mismatch error shaping(MES).These techniques aim to boost the resolution of SAR ADCs while maintaining their superior energy efficiency. | Jiaxin Liu Xiyuan Tang Linxiao Shen Shaolan Li Zhelu Li Wenjuan Guo Nan Sun | 2020 | Journal of Semiconductors2020，41，11： | 2 |
| 2 | Co-culture of Schwann cells and endothelial cells for synergistically regulating dorsal root ganglion behavior on chitosan-based anisotropic topology for peripheral nerve regeneration显示文摘Background:Anisotropic topologies are known to regulate cell-oriented growth and induce cell differentiation,which is conducive to accelerating nerve regeneration,while co-culture of endothelial cells(ECs)and Schwann cells(SCs)can significantly promote the axon growth of dorsal root ganglion(DRG).However,the synergistic regulation of EC and SC co-culture of DRG behavior on anisotropic topologies is still rarely reported.The study aims to investigate the effect of anisotropic topology co-cultured with Schwann cells and endothelial cells on dorsal root ganglion behavior for promoting peripheral nerve regeneration.Methods:Chitosan/artemisia sphaerocephala(CS/AS)scaffolds with anisotropic topology were first prepared using micro-molding technology,and then the surface was modified with dopamine to facilitate cell adhesion and growth.The physical and chemical properties of the scaffolds were characterized through morphology,wettability,surface roughness and component variation.SCs and ECs were co-cultured with DRG cells on anisotropic topology scaffolds to evaluate the axon growth behavior.Results:Dopamine-modified topological CS/AS scaffolds had good hydrophilicity and provided an appropriate environment for cell growth.Cellular immunofluorescence showed that in contrast to DRG growth alone,co-culture of SCs and ECs could not only promote the growth of DRG axons,but also offered a stronger guidance for orientation growth of neurons,which could effectively prevent axons from tangling and knotting,and thus may significantly inhibit neurofibroma formation.Moreover,the co-culture of SCs and ECs could promote the release of nerve growth factor and vascular endothelial growth factor,and up-regulate genes relevant to cell proliferation,myelination and skeletal development via the PI3K-Akt,MAPK and cytokine and receptor chemokine pathways.Conclusions:The co-culture of SCs and ECs significantly improved the growth behavior of DRG on anisotropic topological scaffolds,which may provide an important basis for the development of nerve grafts in peripheral nerve regeneration. | Tiantian Zheng Linliang Wu Shaolan Sun Jiawei Xu Qi Han Yifan Liu Ronghua Wu Guicai Li | 2022 | Burns & Trauma2022，10，1： | 2 |
| 3 | Expression of expansin genes during postharvest lignification and softening of Luoyangqing and Baisha loquat fruit under different storage conditions显示文摘 | Yang Shaolan Sun Chongde Wang Ping | 2008 | Postharvest Biology and Technology2008，49，1： | 1 |
| 4 | Al-induced proteomics changes in tomato plants over-expressing a glyoxalase I gene显示文摘Glyoxalase I(Gly I)is the first enzyme in the glutathionine-dependent glyoxalase pathway for detoxification of methylglyoxal(MG)under stress conditions.Transgenic tomato‘Money Maker’plants overexpressing tomato SlGlyI gene(tomato unigene accession SGN-U582631/Solyc09g082120.3.1)were generated and homozygous lines were obtained after four generations of self-pollination.In this study,SlGlyI-overepxressing line(GlyI),wild type(WT,negative control)and plants transformed with empty vector(ECtr,positive control),were subjected to Al-treatment by growing in Magnavaca’s nutrient solution(pH 4.5)supplemented with 20μM Al3+ion activity.After 30 days of treatments,the fresh and dry weight of shoots and roots of plants from Al-treated conditions decreased significantly compared to the non-treated conditions for all the three lines.When compared across the three lines,root fresh and dry weight of GlyI was significant higher than WT and ECtr,whereas there was no difference in shoot tissues.The basal 5mm root-tips of GlyI plants expressed a significantly higher level of glyoxalase activity under both non-Al-treated and Al-treated conditions compared to the two control lines.Under Al-treated condition,there was a significant increase in MG content in ECtr and WT lines,but not in GlyI line.Quantitative proteomics analysis using tandem mass tags mass spectrometry identified 4080 quantifiable proteins and 201 Al-induced differentially expressed proteins(DEPs)in roottip tissues from GlyI,and 4273 proteins and 230 DEPs from ECtr.The Al-down-regulated DEPs were classified into molecular pathways of gene transcription,RNA splicing and protein biosynthesis in both GlyI and ECtr lines.The Alinduced DEPs in GlyI associated with tolerance to Al3+and MG toxicity are involved in callose degradation,cell wall components(xylan acetylation and pectin degradation),oxidative stress(antioxidants)and turnover of Al-damaged epidermal cells,repair of damaged DNA,epigenetics,gene transcription,and protein translation.A protein–protein association network was constructed to aid the selection of proteins in the same pathway but differentially regulated in GlyI or ECtr lines.Proteomics data are available via ProteomeXchange with identifiers PXD009456 under project title‘25Dec2017_Suping_XSexp2_ITAG3.2’for SlGlyI-overexpressing tomato plants and PXD009848 under project title‘25Dec2017_Suping_XSexp3_ITAG3.2’for positive control ECtr line transformed with empty vector. | Xudong Sun Hui Li Santosh Thapa Sasikiran Reddy Sangireddy Xiaobo Pei Wei Liu Yuping Jiang Shaolan Yang Dafeng Hui Sarabjit Bhatti Suping Zhou Yong Yang Tara Fish Theodore W.Thannhauser | 2020 | Horticulture Research2020，7，1： | 0 |
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