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Mechanical Behavior of Aligned Electrospun Polymer Nanofibers

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Mechanical Behavior of Aligned Electrospun Polymer Nanofiber...

Crosstalk between degradation and bioenergetics: how autophagy and endolysosomal processes regulate energy production

2009年全国高分子学术论文报告会

作者： shing-chung wong Avinash Baji John Najem Harika Surabhi Yiu-Wing Mai Department of Mechanical Engineering University of AkronAkron OH 44325-3903USA

＜正＞This paper reviews our efforts to understand the deformation mechanics of spatially confined polymers with electrospinning-enabled *** first evaluated the tensile behavior of electrospun polycaprolactone（PCL） as a function of nanofiber *** abrupt increase in tensile properties was observed at around 700 nm in *** then examined the molecular orientation of aligned fibers using X-ray diffraction *** further constrain polymer

关键词： electrospinning tensile behavior polycaprolactone X-ray diffraction

来源： cnki会议评论

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Neural Regeneration Research 2025年第3期20卷 671-681页

作者： Angelid Pabon Jagannatham Naidu Bhupana Ching-On wong Department of Biological Sciences Rutgers UniversityNewarkNJUSA

Cells undergo metabolic reprogramming to adapt to changes in nutrient availability, cellular activity, and transitions in cell states. The balance between glycolysis and mitochondrial respiration is crucial for energy production, and metabolic reprogramming stipulates a shift in such balance to optimize both bioenergetic efficiency and anabolic requirements. Failure in switching bioenergetic dependence can lead to maladaptation and pathogenesis. While cellular degradation is known to recycle precursor molecules for anabolism, its potential role in regulating energy production remains less explored. The bioenergetic switch between glycolysis and mitochondrial respiration involves transcription factors and organelle homeostasis, which are both regulated by the cellular degradation pathways. A growing body of studies has demonstrated that both stem cells and differentiated cells exhibit bioenergetic switch upon perturbations of autophagic activity or endolysosomal processes. Here, we highlighted the current understanding of the interplay between degradation processes, specifically autophagy and endolysosomes, transcription factors, endolysosomal signaling, and mitochondrial homeostasis in shaping cellular bioenergetics. This review aims to summarize the relationship between degradation processes and bioenergetics, providing a foundation for future research to unveil deeper mechanistic insights into bioenergetic regulation.

关键词： autophagy bioenergetics endolysosome energy production glycolysis metabolic reprogramming mitochondria

A Two-Stage Color Image Segmentation Method Based on Saturation-Value Total Variation

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Advances in Applied Mathematics and Mechanics 2023年第1期15卷 94-117页

作者： Tiange Wang Hok shing wong Department of Mathematics The Chinese University of Hong KongHong Kong

Color image segmentation is crucial in image processing and computer *** traditional segmentation methods simply regard an RGB color image as the direct combination of the three monochrome images and ignore the inherent color structures within channels,which contain some key feature information of the *** better describe the relationship of color channels,we introduce a quaternion-based regularization that can reflect the image characteristics more *** model combines the idea of the Mumford-Shah model-based two-stage segmentation method and the Saturation-Value Total Variation regularization for color image *** new strategy first extracts features from the color image and then subdivides the image in a new color feature space which achieves better performance than methods in RGB color ***,to accelerate the optimization process,we use a new primal-dual algorithm to solve our novel *** results demonstrate clearly that the performance of our proposed method is excellent.

关键词： Color space pure quaternion image segmentation total variation primal-dual algorithm

Synthesis and blue light-emitting properties of 4,4'-bis(diphenylamino)-quinque(p-phenyl)s

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Chinese Chemical Letters 2007年第7期18卷 823-826页

作者： Zhong Hui Li Mo Jun Xiong Man shing wong Department of Chemistry Sichuan College of Education Chengdu 610041 China West China School of Pharmacy Sichuan University Chengdu 610041 China Department of Chemistry Hong Kong Baptist University Hong Kong China

An excellent organic blue light-emitting diode based on 4,4＇-bis（diphenylamino）-quinque（p-phenylene）s （OPP（5）-NPh） with a maximum luminance of up to 5000 cd/m^2 and a luminanous efficiency of 1.3 cd/A was reported. This diode was made by using a wide band-gap hole-blocking layer, F-TBB instead of PBD in the OLED devices. We attribute the good performance to the one trade-off involved in the use of F-TBB to obtain higher luminance is the increased turn-on voltages and slightly decreased device efficiencies.

关键词： 4,4'-Bis(diphenylamino)-quinque(p-phenylene)s Synthesis Organic light-emitting diode (OLED) Optical properties

The thylakoid membrane protein NTA1 is an assembly factor of the cytochrome b6f complex essential for chloroplast development in Arabidopsis

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Plant Communications 2023年第1期4卷 287-303页

作者： Na Li Wing shing wong Lei Feng Chunming Wang King shing wong Nianhui Zhang Wei Yang Yueming Jiang Liwen Jiang Jun-Xian He School of Life Sciences and State Key Laboratory of Agrobiotechnology The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Key Laboratory of Bio-Resources and Eco-Environment of Ministry of Education College of Life SciencesSichuan UniversityChengduSichuanChina Guangdong Provincial Key Laboratory of Applied Botany&Key Laboratory of South China Agricultural Plant Molecular Analysis and Genetic Improvement Core Botanical GardensSouth China Botanical GardenChinese Academy of SciencesGuangzhouChina

The cytochrome b_(6f)(Cyt b_(6f))complex is a multisubunit protein complex in chloroplast thylakoid membranes required for photosynthetic electron *** we report the isolation and characterization of the new tiny albino 1(nta1)mutant in Arabidopsis,which has severe defects in Cyt b_(6f) accumulation and chloroplast *** cloning revealed that the nta1 phenotype was caused by disruption of a single nuclear gene,NTA1,which encodes an integral thylakoid membrane protein conserved across green algae and *** of NTA1 completely rescued the nta1 phenotype,and knockout of NTA1 in wild-type plants recapitulated the mutant *** of NTA1 function severely impaired the accumulation of multiprotein complexes related to photosynthesis in thylakoid membranes,particularly the components of Cyt b_(6f).NTA1 was shown to directly interact with four subunits(Cyt b6/PetB,PetD,PetG,and PetN)of Cyt b_(6f) through the DUF1279 domain and C-terminal sequence to mediate their *** together,our results identify NTA1 as a new and key regulator of chloroplast development that plays essential roles in assembly of the Cyt b_(6f) complex by interacting with multiple Cyt b_(6f) subunits.

关键词： albino mutant chloroplast development cytochrome b6f complex assembly factor Arabidopsis thaliana

Selenium-induced Changes in Activities of Antioxidant Enzymes and Content of Photosynthetic Pigments in Spirulina platensis

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Journal of Integrative Plant Biology 2008年第1期50卷 40-48页

作者： Tian-Feng Chen Wen-Jie Zheng Yum-shing wong Fang Yang Department of Biology The Chinese University of Hong Kong Hong Kong SAR China Department of Chemistry Jinan University Guangzhou 510632 China

Spirulina platensis exposed to various selenium （Se） concentrations （0, 10, 20, 40, 80, 150, 175, 200, 250 mg/L） accumulated high amounts of Se in a dose- and time-dependent manner. Under low Se concentrations （〈150 mg/L）, Se induced increases in biomass concentration, content of photosynthetic pigments, and activities of glutathione peroxidase （GPX）, superoxide dismutase （SOD）, catalase （CAT） and Gua-dep peroxidases （POD）, which indicates that antioxidant enzymes play an important role in protecting cells from Se stress. Higher Se concentrations （≥175 mg/L） led to higher Se accumulation and increases in activities of GPX, SOD, CAT and POD, but also induced lipid peroxidation （LPO） coupled with potassium leakage and decreases in biomass concentration and contents of photosynthetic pigment. The results indicate that increases in activities of the antioxidant enzymes were not sufficient to protect cell membranes against Se stress. Time-dependent variations in the activities of antioxidant enzymes, contents of chlorophyll a and carotenoid and the LPO level were also investigated under representative Se concentrations of 40 and 200mg/L. Opposite variation trends between SOD-CAT activities, and GPX-POD-APX activities were observed during the growth cycles. The results showed that the prevention of damage to cell membranes of S. platensis cells could be achieved by cooperative effects of SOD-CAT and GPX-POD-APX enzymes. This study concludes that S. platensis possessed tolerance to Se and could protect itself from phytotoxicity induced by Se by altering various metabolic processes.

关键词： accumulation antioxidant enzymes photosynthetic pigments selenium Spirulina platensis.

Advances in Graphene‑Based Electrode for Triboelectric Nanogenerator

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Nano-Micro Letters 2025年第1期17卷 378-403页

作者： Bin Xie Yuanhui Guo Yun Chen Hao Zhang Jiawei Xiao Maoxiang Hou Huilong Liu Li Ma Xin Chen Chingping wong State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006People’s Republic of China School of Materials Science and Engineering Georgia Institute of TechnologyAtlantaGA 30332USA

With the continuous development of wearable electronics,wireless sensor networks and other micro-electronic devices,there is an increasingly urgent need for miniature,flexible and efficient nanopower generation *** nanogenerator(TENG)technology can convert small mechanical energy into electricity,which is expected to address this *** the core component of TENG,the choice of electrode materials significantly affects its *** metal electrode materials often suffer from problems such as durability,which limits the further application of ***,as a novel electrode material,shows excellent prospects for application in TENG owing to its unique structure and excellent electrical *** review systematically summarizes the recent research progress and application prospects of TENGs based on graphene *** precision processing methods of graphene electrodes are introduced,and the applications of graphene electrode-based TENGs in various scenarios as well as the enhancement of graphene electrodes for TENG performance are *** addition,the future development of graphene electrode-based TENGs is also prospectively discussed,aiming to promote the continuous advancement of graphene electrode-based TENGs.

关键词： Triboelectric nanogenerator Precision processing Graphene electrode Self-powered sensor

Housing price dispersion in the presale market

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Economic and Political Studies 2020年第1期8卷 65-81页

作者： Siu Kei wong Ka shing Cheung Department of Real Estate and Construction University of Hong Kongthe Hong Kong SARChina The Ronald Coase Centre for Property Rights Research University of Hong Kongthe Hong Kong SARChina Department of Property The University of Auckland Business SchoolAucklandNew Zealand

Sale before completion(***)is a common practice that real estate developers use to sell residential *** presale buyers are unable to inspect uncompleted units,developers may take advantage of asymmetric information and release information about quality to the market *** search theory also suggests that incomplete pricing information,especially for new products,will induce a less competitive market that is characterised by dispersed presale *** price dispersion be reduced if developers were required to provide more quality and pricing information?In this study,we argue that this is not necessarily the *** conduct a natural experiment using a new information disclosure ordinance governing first-hand residential sales in the Hong Kong SAR,*** find that the ordinance reduced the price dispersion of presale units with asymmetric information about property quality,but increased their price dispersion when limited pricing information(*** trading volume)was available in the *** a critical test,we further show that the ordinance increased price dispersion even more after the units were *** suggests that the ordinance has indeed made presale pricing more difficult because developers are no longer allowed to use different strategies to test market demand.

关键词： Price dispersion presale housing market pricing information quality information natural experiment

Design, Synthesis, Photophysical Studies and Electrochemistry of Carbazole-, Oxadiazole-, and Oxadiazole-Triarylamine-Containing Rhenium(Ⅰ) Diimine Alkynyl Complexes

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Chinese Journal of Chemistry 2014年第10期32卷 1015-1021页

作者： Wai-Kin chung Keith Man-chung wong Vivian Wing-Wah Yam and Department of ChemistryThe University of Hong KongPokfulam RoadHong KongChina

A series of rhenium(I)diimine alkynyl complexes with various electron-and hole-transporting moieties has been synthesized and *** electronic absorption,emission and electrochemical properties have also been studied.

关键词： electrochemistry luminescence metal alkynyl rhenium(Ⅰ)diimine,UV/Vis spectroscopy