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Proposal for valleytronic materials:Ferrovalley metal and valley gapless semiconductor

Frontiers of physics 2024年第2期19卷 131-139页

作者： San-Dong Guo Yu-ling Tao Guangzhao Wang Shaobo Chen Dong Huang yee Sin Ang School of Electronic Engineering Xi’an University of Posts and TelecommunicationsXi’an 710121China Key Laboratory of Extraordinary Bond Engineering and Advanced Materials Technology of Chongqing School of Electronic Information EngineeringYangtze Normal UniversityChongqing 408100China College of Electronic and Information Engineering Anshun UniversityAnshun 561000China Science Mathematics and Technology(SMT)Singapore University of Technology and Design(SUTD)8 Somapah RoadSingapore 487372Singapore

Valleytronic materials can provide new degrees of freedom to future electronic *** this work,the concepts of the ferrovalley metal(FVM)and valley gapless semiconductor(VGS)are proposed,which can be achieved in valleytronic bilayer systems by electric field *** valleytronic bilayer systems,the interaction between out-of-plane ferroelectricity and A-type antiferromagnetism can induce layer-polarized anomalous valley Hall(LP-AVH)*** K and−K valleys of FVM are both metallic,and electron and hole carriers simultaneously *** the extreme case,the FVM can become VGS by analogizing spin gapless semiconductor(SGS).Moreover,it is proposed that the valley splitting enhancement and valley polarization reversal can be achieved by electric field engineering in valleytronic bilayer *** the bilayer RuBr_(2)as an example,our proposal is confirmed by the first-principle *** FVM and VGS can be achieved in bilayer RuBr_(2)by applying electric *** appropriate electric field range,increasing electric field can enhance valley splitting,and the valley polarization can be reversed by flipping electric field *** effectively tune valley properties by electric field in bilayer systems,the parent monolayer should possess out-of-plane magnetization,and have large valley *** results shed light on the possible role of electric field in tuning valleytronic bilayer systems,and provide a way to design the ferrovalley-related material by electric field.

关键词： valleytronics electric field bilayer

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Phenol photocatalytic degradation over mesoporous TUD-1-supported chromium oxide-doped titania photocatalyst

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Chinese Journal of Catalysis 2016年第11期37卷 1871-1881页

作者： yee Khai Ooi Leny Yuliati Siew ling Lee 马来西亚工艺大学理学院化学系马来西亚新山81310 马来西亚工艺大学科学与工业研究所可持续纳米材料中心马来西亚新山81310

Mesoporous Technische Universiteit Delft（TUD-1）-supported chromium oxide-doped titania（Cr-TiO2） was developed as a promising photocatalyst for phenol photodegradation under visible light ***-angle X-ray diffraction and Fourier transform infrared spectroscopy results confirmed the amorphous and mesoporous silicate framework of TUD-1 in TUD-1-supported *** mesostructure of TUD-1 was further verified via N2 adsorption-desorption analysis,which showed a type-IV isotherm with a narrow average pore size distribution of 3.9 nm and high surface area of 490 m^2/*** electron microscopy analysis results indicated that TUD-1-supported Cr-TiO2 contained nanoparticles and porous *** increase in band gap energy was observed after loading Cr-TiO2 into *** with that of unsupported Cr-TiO2,TUD-1-supported Cr-TiO2 showed higher photocatalytic activity for phenol degradation under visible light *** TUD-1 supported Cr-TiO2 photocatalyst with a Si/Ti molar ratio of 30 exhibited the highest photodegradation of phenol（82%） of the prepared *** photodegradation of phenol by the supported catalyst followed the Langmuir adsorption isotherm with first-order kinetics.

关键词： Phenol TUD-1 Titania Photocatalyst Mesoporous

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Indoleamine 2,3-dioxygenase (IDO) is essential for dendritic cell activation and chemotactic responsiveness to chemokines

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Cell Research 2005年第3期15卷 167-175页

作者： Shih ling HWANG,Nancy Pei-yee CHUNG,Jacqueline Kwai-Yi CHAN,Chen-Lung Steve LIN Department of Surgery Kaohsiung Medical University Kaohsiung Taiwan China Department of Surgery The University of Hong Kong Medical Centre Queen Mary Hospital Pokfulam Road Hong KongSAR China Department of Surgery The University of Hong Kong Medical Centre Queen Mary Hospital Pokfulam Road Hong KongSAR China Department of Surgery The University of Hong Kong Medical Centre Queen Mary Hospital Pokfulam Road Hong KongSAR China

Indoleamine 2, 3-dioxygenase (IDO) is a rate-limiting enzyme for the tryptophan catabolism. In human and murine cells, IDO inhibits antigen-specific T cell proliferation in vitro and suppresses T cell responses to fetal alloantigens during murine pregnancy. In mice, IDO expression is an inducible feature of specific subsets of dendritic cells (DCs), and is important for T cell regulatory properties. However, the effect of IDO and tryptophan deprivation on DC func- tions remains unknown. We report here that when tryptophan utilization was prevented by a pharmacological inhibitor of IDO, 1-methyl tryptophan (1MT), DC activation induced by pathogenic stimulus lipopolysaccharide (LPS) or inflam- matory cytokine TNF-α was inhibited both phenotypically and functionally. Such an effect was less remarkable when DC was stimulated by a physiological stimulus, CD40 ligand. Tryptophan deprivation during DC activation also regu- lated the expression of CCR5 and CXCR4, as well as DC responsiveness to chemokines. These results suggest that tryptophan usage in the microenvironment is essential for DC maturation, and may also play a role in the regulation of DC migratory behaviors.

关键词： Indoleamine 2 3-dioxygenase (IDO) dendritic cells activation T cell tryptophan chemokine.

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Deep Learning-Based Trees Disease Recognition and Classification Using Hyperspectral Data

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Computers, Materials & Continua 2023年第10期77卷 681-697页

作者： Uzair Aslam Bhatti Sibghat Ullah Bazai Shumaila Hussain Shariqa Fakhar Chin soon Ku Shah Marjan Por Lip yee Liu Jing College of Information and Communication Engineering Hainan UniversityHaikou570228China Department of Computer Engineering Balochistan University of Information TechnologyEngineeringand Management Sciences(BUITEMS)QuettaPakistan Department of Computer Science Sardar Bahadur Khan Women’s UniversityQuettaPakistan Department of Computer Science Universiti Tunku Abdul RahmanKampar31900Malaysia Department of Software Engineering Balochistan University of Information TechnologyEngineeringand Management Sciences(BUITEMS)QuettaPakistan Faculty of Computer Science and Information Technology University of MalayaKuala Lumpur50603Malaysia

Crop diseases have a significant impact on plant growth and can lead to reduced *** methods of disease detection rely on the expertise of plant protection experts,which can be subjective and dependent on individual experience and *** address this,the use of digital image recognition technology and deep learning algorithms has emerged as a promising approach for automating plant disease *** this paper,we propose a novel approach that utilizes a convolutional neural network(CNN)model in conjunction with Inception v3 to identify plant leaf *** research focuses on developing a mobile application that leverages this mechanism to identify diseases in plants and provide recommendations for overcoming specific *** models were trained using a dataset consisting of 80,848 images representing 21 different plant leaves categorized into 60 distinct *** rigorous training and evaluation,the proposed system achieved an impressive accuracy rate of 99%.This mobile application serves as a convenient and valuable advisory tool,providing early detection and guidance in real agricultural *** significance of this research lies in its potential to revolutionize plant disease detection and management *** automating the identification process through deep learning algorithms,the proposed system eliminates the subjective nature of expert-based diagnosis and reduces dependence on individual *** integration of mobile technology further enhances accessibility and enables farmers and agricultural practitioners to swiftly and accurately identify diseases in their crops.

关键词： Plant disease Inception v3 CNN crop diseases

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The characterization and dissolution performances of spray dried solid dispersion of ketoprofen in hydrophilic carriers

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Asian Journal of Pharmaceutical Sciences 2015年第5期10卷 372-385页

作者： Siok-yee Chan Yin-Ying Chung Xin-Zi Cheah Eryn Yen-ling Tan Joan Quah School of Pharmaceutical Sciences Universiti Sains Malaysia11800 Pulau PinangMalaysia

Solid dispersion is one of the most promising strategies to improve oral bioavailability of poorly soluble ***,there are inconsistent dissolution performances of solid dispersion reported which entails further *** this study,solid dispersions of ketoprofen in three hydrophilic carriers,*** K30,PVPVA 6:4 and PVA were prepared and *** characterization of the physical mixture of ketoprofen and carriers shows certain extent of amorphization of the *** result is coinciding to evaluation of drug-polymer interaction using ATR-FTIR whereby higher amorphization was seen in samples with higher drug-polymer *** scanning confirms that fully amorphous solid dispersion was obtained for SD KTP PVP K30 and PVPVA system whereas partially crystalline system was obtained for SD KTP ***,dissolution profiles of the solid dispersion had shown that degree of amorphization of KTP was not directly proportional to the dissolution rate enhancement of the solid dispersion ***,it is concluded that complete amorphization does not guarantee dissolution enhancement of an amorphous solid dispersion system.

关键词： Solid dispersion Amorphous Polymer PVP PVPVA ketoprofen

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Comparative analysis of current diagnostic PCR assays in detecting pathogenic Leptospira isolates from environmental samples

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Asian Pacific Journal of Tropical Medicine 2019年第10期12卷 472-478页

作者： May-ling Yap Zamberi Sekawi Hui-yee Chee Han Kiat Alan Ong Vasantha Kumari Neela Department of Medical Microbiology and Parasitology Faculty of Medicine and Health SciencesUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Department of Pre-Clinical Sciences Faculty of Medicine and Health SciencesUniversiti Tunku Abdul RahmanBandar Sungai Long43000 KajangSelangorMalaysia

Objective:To compare the efficiency of routine diagnostic PCR assays in detecting pathogenic Leptospira isolated from water and ***:Seven routine assays targeting six genes(lip L32,fla B,gyr B,lfb1,sec Y and lig B)were evaluated and compared on the cultures of two groups of pathogenic Leptospira from different *** group included 19 described reference strains recovered from infected human or animals,and another group included 22 environmental isolates from recreational and residential sites in *** latter have been confirmed for presence of pathogenic Leptospira *** positivity or detection sensitivity of each assay was determined and compared between the two ***:Validation on reference strains showed 100.0%PCR sensitivity for all assays except lig B-PCR(95.0%)that failed to amplify Leptospira interrogans serovar *** marked contrast,there was a notable decline in sensitivity in the environmental isolates(lip L32-PCR,95.5%;fla B-PCR,90.9%;gyr B-PCR,77.3%;lfb1-PCR,59.1%;sec Y-PCRs,40.9%G1/G2-PCR,36.4%;lig B-PCR,13.6%),implying a large genetic distance between the two groups,as well as nucleotide polymorphism among environmental ***:High proportion of false-negative PCR results suggests a need of prudent selection of primers in detecting environmental pathogenic *** findings offer valuable insights on the extensive biodiversity of genus Leptospira and its impact on the efficacy and development of molecular detection tool.

关键词： Leptospira Pathogenic species Environmental samples PCR Sensitivity

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Sonication and grinding pre-treatments on Gelidium amansii seaweed for the extraction and characterization of Agarose

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Frontiers of Environmental Science & Engineering 2018年第4期12卷 17-23页

作者： Kit Wayne Chew Pau Loke Show yee Jiun Yap Joon Ching Juan Siew Moi Phang Tau Chuan ling Jo-Shu Chang Department of Chemical and Environmental Engineering Faculty of Engineering University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia Bioseparation Research Group Faculty of Engineering University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia Department of Applied Mathematics Faculty of Engineering University of Nottingham Malaysia Campus Jalan Broga 43500 Semenyih Selangor Darul Ehsan Malaysia Nanotechnology & Catalysis Research Centre (NANOCAT) Institute of Postgraduate Studies University of Malaya 50603 Kuala Lumpur Malaysia Institute of Ocean and Earth Sciences University of Malaya 50603 Kuala Lumpur Malaysia Institute of Biological Sciences University of Malaya 50603 Kuala Lumpur Malaysia Department of Chemical Engineering National Cheng Kung University Tainan 701 Taiwan China

Various prctreatments methods including sonication and grinding were perfonned on red seaweed Gelidium amansii for the subsequent extraction ofagarose. The agarose products are usually extracted from agar powder products from seaweeds. In this study, the agarose was extracted using a direct polyethylene glycol （PEG） method without the need to first process the agar from seaweed. The agar extract was frozen then thawed and mixed directly with PEG solution to precipitate the agarose. The quality of agarose obtained was evaluated through physico-chemical properties analysis which includes spectral technique （FTIR）, melting and boiling point, gel strength and sulfate content. These properties were compared with a non-pretreated sample and it was found that the addition of pretreatment steps improved the quality of agarosc but gave a slightly lower yield. The gel strength of pretreated samples was much higher and the sulfate content was lower compared to non-pretreated samples. The best pretreatment method was sonication which gave gel strength of 742 gcm - and sulfate content of 0.63%. The extraction of agarose can be further improved with the use of different neutralizing agents. Pretreating the seaweed shows potential in improving the quality of agarosc from seaweed and can be applied for thture extraction of the agarose.

关键词： AgaroseGe lidium Pretreatment Seaweed Sonication

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Root exclusion methods for partitioning of soil respiration:Review and methodological considerations

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Pedosphere 2023年第5期33卷 683-699页

作者： Mei-yee CHIN Sharon Yu ling LAU Frazer MIDOT Mui Sie JEE Mei Lieng LO Faustina E.SANGOK Lulie MELling Sarawak Tropical Peat Research Institute Lot 6035Kuching-Kota Samarahan ExpresswayKota SamarahanSarawak 94300Malaysia

Soil respiration is a vital process in all terrestrial ecosystems,through which the soil releases carbon dioxide(CO_(2))into the atmosphere at an estimated annual rate of 68–101 Pg carbon,making it the second highest terrestrial contributor to carbon *** soil respiration consists of autotrophic and heterotrophic constituents,methods for accurately determining the contribution of each constituent to the total soil respiration are critical for understanding their differential responses to environmental factors and aiding the reduction of CO_(2)*** to its low cost and simplicity,the root exclusion(RE)technique,combined with manual chamber measurements,is frequently used in field studies of soil respiration ***,RE treatments alter the soil environment,leading to potential bias in respiration *** review aims to elucidate the current understanding of RE,i.e.,trenching(Tr)and deep collar(DC)insertion techniques,by examining soil respiration partitioning studies performed in several ***,we discuss methodological considerations when using RE and the combinations of RE with stable isotopic and modeling ***,future research directions for improving the Tr and DC insertion methods in RE are suggested.

关键词： autotrophic respiration deep collar insertion heterotrophic respiration microbial respiration root trenching soil microbial community soil respirationcomponent

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Adenosine monophosphate enhances callus regeneration competence for de novo plant organogenesis

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Molecular Plant 2023年第12期16卷 1867-1870页

作者： Hong Gil Lee Seo Young Jang Eun yee Jie Seung Hee Choi Ok-Sun Park soon Hyung Bae Hyun-soon Kim Suk Weon Kim Geum-Sook Hwang Pil Joon Seo Department of Chemistry Seoul National UniversitySeoul 08826Korea Plant Genomics and Breeding Institute Seoul National UniversitySeoul 08826Korea Integrated Metabolomics Research Group Western Seoul CenterKorea Basic Science InstituteSeoul 03759Korea Biological Resource Center Korea Research Institute of Bioscience and BiotechnologyJeongeup56212Korea Plant Systems Engineering Research Center Korea Research Institute of Bioscience and BiotechnologyDaejeon 34141Korea College of Pharmacy Chung-Ang UniversitySeoul 06974Korea

Dear Editor,Plant tissue culture involves callus formation and de novo shoot ***,explants from differentiated tissues are used to generate a pluripotent cell mass,called callus,on auxin-rich callus-inducing medium(CIM),followed by shoot regeneration on cytokinin-rich shoot-inducing medium(SiM).Callus results from division of pericycle-like cells(Atta et al.,2009;Sugimoto et al.,2010);its cellular identity resembles that of lateral root primordia(Atta et al.,2009;Sugimoto et al.,2010).Callus acquires cellular pluripotency by forming root stem cell niches on CIM(Sugimoto et al.,2010)。

关键词： Adenosine callus

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Evolution-guided Bayesian optimization for constrained multi-objective optimization in self-driving labs

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npj Computational Materials 2024年第1期10卷 2171-2181页

作者： Andre K.Y.Low Flore Mekki-Berrada Abhishek Gupta Aleksandr Ostudin Jiaxun Xie Eleonore Vissol-Gaudin yee-Fun Lim Qianxiao Li Yew soon Ong Saif A.Khan Kedar Hippalgaonkar School of Materials Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore Institute of Materials Research and Engineering(IMRE) Agency for ScienceTechnology and Research(A*STAR)2 Fusionopolis WayInnovis#08-03Singapore 138634Republic of Singapore Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore School of Mechanical Sciences Indian Institute of Technology GoaGoa 403401India Institute of Sustainability for Chemicals Energy and Environment(ISCE2)Agency for ScienceTechnology and Research(A*STAR)1 Pesek RoadSingapore 627833Republic of Singapore Department of Mathematics National University of SingaporeSingapore 119077Singapore Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore School of Computer Science and Engineering Nanyang Technological UniversitySingapore 639798Singapore

The development of automated high-throughput experimental platforms has enabled fast sampling of high-dimensional decision *** reach target properties efficiently,these platforms are increasingly paired with intelligent experimental ***,current optimizers show limitations in maintaining sufficient exploration/exploitation balance for problems dealing with multiple conflicting objectives and complex ***,we devise an Evolution-Guided Bayesian Optimization(EGBO)algorithm that integrates selection pressure in parallel with a q-Noisy Expected Hypervolume Improvement(qNEHVI)optimizer;this not only solves for the Pareto Front(PF)efficiently but also achieves better coverage of the PF while limiting sampling in the infeasible space.

关键词： optimization driving constrained

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