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Plasmonic bacteria on a nanoporous mirror via hydrodynamic trapping for rapid identification of waterborne pathogens

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Light(science & Applications) 2018年第1期7卷 359-367页

作者： Keumrai Whang Jong-Hwan Lee Yonghee Shin Wooju Lee Young Wan Kim Dongchoul Kim Luke P.Lee Taewook Kang Department of Chemical and Biomolecular Engineering Sogang UniversitySeoul 04107Korea Berkeley Sensor and Actuator Center Departments of BioengineeringElectrical Engineering and Computer ScienceBiophysics Graduate ProgramUniversity of CaliforniaBerkeleyBerkeleyCA 94720USA Department of Mechanical Engineering Sogang UniversitySeoul 04107Korea

A rapid,precise method for identifying waterborne pathogens is critically needed for effective disinfection and better ***,conventional methods,such as culture-based counting,generally suffer from slow detection times and low ***,we developed a rapid detection method for tracing waterborne pathogens by an innovative optofluidic platform,a plasmonic bacteria on a nanoporous mirror,that allows effective hydrodynamic cell trapping,enrichment of pathogens,and optical signal *** designed and simulated the integrated optofluidic platform to maximize the enrichment of the bacteria and to align bacteria on the nanopores and plasmonic mirror via hydrodynamic cell *** nanoparticles are self-assembled to form antenna arrays on the surface of bacteria,such as Escherichia coli and Pseudomonas aeruginosa,by replacing citrate with hydroxylamine hydrochloride in order to amplify the signal of the plasmonic optical *** to the synergistic contributions of focused light via the nanopore geometry,self-assembled nanoplasmonic optical antennas on the surface of bacteria,and plasmonic mirror,we obtain a sensitivity of detecting *** as low as 102 cells/ml via surface-enhanced Raman *** believe that our label-free strategy via an integrated optofluidic platform will pave the way for the rapid,precise identification of various pathogens.

关键词： mirror trapping precise

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Influence of Potassium Metal-Support Interactions on Dendrite Growth

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Angewandte Chemie 2023年第23期135卷

作者： Pengcheng Liu Dean Yen Bairav S. Vishnugopi Varun R. Kankanallu Doğa Gürsoy Mingyuan Ge John Watt Partha P. Mukherjee Yu-chen Karen Chen-Wiegart David Mitlin Materials Science and Engineering Program & Texas Materials Institute (TMI) The University of Texas at Austin Austin TX 78712-1591 USA Department of Materials Science and Chemical Engineering Stony Brook University Stony Brook NY 11794 USA School of Mechanical Engineering Purdue University West Lafayette IN 47907 USA Advanced Photon Source Argonne National Laboratory Lemont IL 60439 USA National Synchrotron Light Source II (NSLS-II) Brookhaven National Laboratory Upton NY 11973-5000 USA Center for Integrated Nanotechnologies Los Alamos National Laboratory Los Alamos NM 87545 USA

Combined synchrotron X-ray nanotomography imaging, cryogenic electron microscopy (cryo-EM) and modeling elucidate how potassium (K) metal-support energetics influence electrodeposit microstructure. Three model supports are employed: O-functionalized carbon cloth (potassiophilic, fully-wetted), non-functionalized cloth and Cu foil (potassiophobic, nonwetted). Nanotomography and focused ion beam (cryo-FIB) cross-sections yield complementary three-dimensional (3D) maps of cycled electrodeposits. Electrodeposit on potassiophobic support is a triphasic sponge, with fibrous dendrites covered by solid electrolyte interphase (SEI) and interspersed with nanopores (sub-10 nm to 100 nm scale). Lage cracks and voids are also a key feature. On potassiophilic support, the deposit is dense and pore-free, with uniform surface and SEI morphology. Mesoscale modeling captures the critical role of substrate-metal interaction on K metal film nucleation and growth, as well as the associated stress state.

关键词： Metal Dendrite Potassium Ion Battery Potassium Metal Battery Potassium Sulfur Battery

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Natural remedies for post-inflammatory hyperpigmentation: Antibacterial and anti-melanogenesis properties of Thai herbs

Pharmacological Research - Natural Products

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Pharmacological Research - Natural Products 2025年 8卷

作者： Soontari Komkonekaew Wichuta Kamphuan Phattaraporn Paobthong Warinporn Anukoonrajchathon Pacharaporn Putthangkul Sarocha Sapcharoen Chanikan Sonklin Wiwat Klankaew Kanyanat Khongrin Kiattawee Choowongkomon Saranya Sedthananan Lueacha Tabtimmai Department of Biotechnology Faculty of Appiled Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand Department of Industrial Chemistry Faculty of Appiled Science King Mongkut’s University of Technology North Bangkok Bangkok Thailand Interdisciplinary Program in genetic Engineering and Bioinformatics Graduate School Kasetsart University Bangkok Thailand Department of Biochemistry Faculty of Science Kasesart University Bangkok Thailand Center for Advanced Studies in Nanotechnology for Chemical Food and Agricultural Industries KU Institute for Advanced Studies Kasetsart University Bangkok Thailand Food and Agro-Industrial Research Center King Mongkut’s University of Technology North Bangkok Bangkok Thailand

Post-inflammatory hyperpigmentation (PIH) occurs when excess melanin is produced in response to skin irritation or injury, resulting in uneven pigmentation. This study evaluates the cosmeceutical potential of ethanolic extracts from eight Thai herbs— Curcuma xanthorrhiza (CX), Quercus infectoria (QI), Calophyllum inophyllum (CI), Caesalpinia sappan (CS), Garcinia hanburyi (GH), Punica granatum (PG), Cotylelobium lanceolatum (CL), and Strychnos nux-vomica (SN)—to treat PIH through antioxidant, anti-inflammatory, antibacterial, and anti-melanogenesis properties. Phytochemical analysis revealed that CX and QI contained high levels of phenolics and flavonoids, correlating with their strong antioxidant activity. CX also protected against hydrogen peroxide (H₂O₂)-induced oxidative stress in a yeast-based model and prevented DNA damage in vitro, helping to mitigate cellular injury that can lead to melanin overproduction. Anti-inflammatory assays showed that both CX and QI significantly reduced nitric oxide and interleukin-6 (IL-6) levels without causing cytotoxicity, supporting their role in treating inflammation-related PIH. The extracts also demonstrated selective antibacterial activity against Staphylococcus aureus (MSSA and MRSA) and Cutibacterium acnes , while sparing Staphylococcus epidermidis , an important member of the skin microbiome. CI and CX significantly inhibited C. acnes , a key contributor to acne-induced PIH. Finally, anti-melanogenesis assays revealed that QI and SN effectively inhibited α-MSH-induced melanin production. These findings suggest that CX, QI, and CI are promising natural cosmeceutical agents for addressing PIH by modulating oxidative stress, inflammation, microbial imbalance, and melanin overproduction, while maintaining skin microbiota integrity.

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Decoding Transition between Kinematics Stages for Brain-Machine Interface*

Decoding Transition between Kinematics Stages for Brain-Mach...

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IEEE International Conference on Systems, Man and Cybernetics

作者： Shuhang Chen Xiang Zhang Xiang Shen Yifan Huang Yiwen Wang Program of Bioengineering Hong Kong University of Science and Technology department of Electronic and Computer Engineering Hong Kong University of Science and Technology department of Chemical and Biological Engineering Hong Kong University of Science and Technology

ISBN: (纸本)9781728145709

Brain-machine interfaces (BMIs) translate the neural activity into digital command to control external devices in accomplishing movement task, which could involve multiple stages of behaviors in sequence. Previous work generally discriminates the stage labels using a classifier and uses a combination of sub-decoders designed respectively for each stage. Without considering the time dynamics of neural activity, the classifier often introduces noisy estimation in stage prediction. Brain-controlling neuro-prosthesis requires the decoder to continuously output the kinematics interpretation on brain state for each time instance, including when to start or end each stage within the task smoothly and accurately. We propose to decode the kinematic states within stages and during stage transition in one paradigm. The kinematics state vector is extended, and the time dynamics is modelled in the state-observation framework. We validate our approach on a brain-controlled lever discrimination task. The rats need to adjust the neural activity to press the correct virtual lever and drives the brain state to trigger the start of the next trial. Compared with the existing method whose mean square error is 0.8038, our results show smoother transition prediction and better decoding accuracy with less mean square error which is 0.7922. And the correction rate of holding lever and rest is above 90%. These results help the subjects do the task with even less response time (2.81s) and shorter inter-trial duration (4.5s).

关键词： Decoding Kinematics Pressing Neural activity Task analysis Rats Human factors

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Reverse electrodialysis membrane for harvesting salinity gradient energy with and without spacer under natural wetland water

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AIP Conference Proceedings 2023年第1期2932卷

作者： Muthia Elma Dwi Resa Lamandau Siti Fatimah Satria Anugerah Suhendra Aulia Rahma Department of Chemical Engineering Faculty of Engineering Lambung Mangkurat University Jl. A. Yani KM 36 Banjarbaru 70714 Indonesia Materials and Membranes Research Group (M2ReG) Lambung Mangkurat University Jl. A. Yani KM 36 Banjarbaru 70714 Indonesia Environmental Science Doctoral and Postgraduate Program Lambung Mangkurat University Jl. Brigjen H. Hasan Basry Banjarmasin 70123 Indonesia

Salinity gradient energy (SGE) allows two solutions with different salt concentration to mixing and directly into electrical energy by reverse electrodialysis (RED) membrane. High power outputs are forecasted theoretically, but in real practice is still relatively low RED power efficiency. In this work, the spacer shadow effects on both membrane and solution compartment resistances are investigated by employing nylon spacer and without spacer. In addition, this experiment also proposes the power density performance of RED membrane under natural wetland water as low saline solution and variation of high saline solution i.e., artificial brackish water (0.3 wt% NaCl) and artificial seawater (3.5 wt% NaCl). The results indicate that the spacer shadow effect on RED membrane has a correlation with energy output generated. The used of spacer led to an increase in stack resistance and decrease in power density compared to without nylon spacer. This result increases the impact of RED renewable power source and brings it closer to practical implementation, especially for the potential natural wetland water as low saline solution. The power output was computed, obtaining a maximum power density of 0.19 W/m2 with variations without spacers, and 0.14 W/m2 with spacers. Results show that of the cell components directly influences the physicochemical principles governing the RED process and is closely related to the cell output parameters. In turn, it is possible to increase the performance of a RED cell by optimizing operation without spacers to avoid the shadow effect.

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Cover Picture: Influence of Potassium Metal-Support Interactions on Dendrite Growth (Angew. Chem. Int. Ed. 23/2023)

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Angewandte Chemie International Edition 2023年第23期62卷

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Titelbild: Influence of Potassium Metal-Support Interactions on Dendrite Growth (Angew. Chem. 23/2023)

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Angewandte Chemie 2023年第23期135卷

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A hypoxia-activated copper ion nanoexchanger for cancer immunotherapy by in situ precise production of immunogenic cell death inducer

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Chinese chemical Letters 2025年

作者： Xinlu Zhang Yongxin Liu Huan Li Shutong Chen Guocheng Wang Xu Zhang Chen Cao Xiaoyuan Chen Sheng Wang School of Life Sciences Faculty of Medicine Tianjin University Tianjin 300072 China Department of Diagnostic Radiology Yong Loo Lin School of Medicine National University of Singapore Singapore 119074 Singapore Department of Chemical and Biomolecular Engineering College of Design and Engineering National University of Singapore Singapore 117575 Singapore Department of Biomedical Engineering College of Design and Engineering National University of Singapore Singapore 117575 Singapore Department of Pharmacy and Pharmaceutical Sciences Faculty of Science National University of Singapore Singapore 117544 Singapore Clinical Imaging Research Centre Centre for Translational Medicine Yong Loo Lin School of Medicine National University of Singapore Singapore 117599 Singapore Nanomedicine Translational Research Program Yong Loo Lin School of Medicine National University of Singapore Singapore 117597 Singapore Theranostics Center of Excellence (TCE) Yong Loo Lin School of Medicine National University of Singapore Singapore 138667 Singapore Institute of Molecular and Cell Biology Agency for Science Technology and Research (A*STAR) Singapore 138673 Singapore

In situ therapeutic agent production strategy is promising to overcome the drawbacks of direct drug delivery. Hypoxia provides a great target for precise treatment of tumor. Here we report a copper ion competition-based nanoparticle (NP) for hypoxia-activated formation of diethyldithiocarbamate (DTC)-copper complex, an immunogenic cell death (ICD) inducer. The NP is composed of an amphiphilic hypoxia-responsive DTC precursor and a fluorescence quenched copper ion-chelated squaric acid. In hypoxic tumor cells, the azobenzene linker in DTC precursor can be cleaved through bioreduction, leading to DTC release and subsequent copper ion exchange between DTC and squaric acid. Simultaneous formation of toxic DTC-copper complexes and fluorescence recovery will allow for visualization of in situ therapeutic agents production. Furthermore, the DTC-copper complexes can induce ICD and promote cytotoxic T lymphocyte infiltration for cancer immunotherapy. This study not only provides a promising hypoxia-activated nanomedicine for precision cancer therapy, but also a visualization strategy for evaluating the treatment process.

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Proton/Electron Donors Enhancing Electrocatalytic Activity of Supported Conjugated Microporous Polymers for CO2Reduction

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Angewandte Chemie 2021年第5期134卷

作者： Dr. Rong Wang Xinyue Wang Weijun Weng Ying Yao Dr. Pinit Kidkhunthod Prof. Dr. Changchun Wang Prof. Dr. Yang Hou Prof. Dr. Jia Guo State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular Science Fudan University Shanghai 200438 China Key Laboratory of Biomass Chemical Engineering of Ministry of Education College of Chemical and Biological Engineering Zhejiang University Hangzhou 310027 China Synchrotron Light Research Institute (Public Organization) 111 University Avenue Muang District Nakhon Ratchasima 30000 Thailand

Metal phthalocyanines (MePc) hold great promise in electrochemical reduction of CO 2 to value-added chemicals, whereas the catalytic activity of MePc-containing polymers often suffers from a limited molecular modulation strategy. Herein, we synthesize an ultrathin conjugated microporous polymer sheath around carbon nanotubes by an ionothermal copolymerization of CoPc and H 2 Pc via the Scholl reaction. Given the H 2 Pc-mediated regulation in the synthesis, Co II metal is well preserved in the form of single atoms on the polymer sheath of the carbon nanotubes. With the synergistic effect of H 2 Pc moieties as proton/electron donors, the composites can selectively reduce CO 2 to CO with a high Faradaic efficiency (max. 97 % at −0.9 V) in broad potential windows, exceptional turnover frequency (97 592 h −1 at −0.65 V) and large current density (>200 mA cm −2 ). It is thus desirable to develop a family of heterogeneous polymerized MePc with molecularly regulating electrocatalytic activity.

关键词： Conjugated microporous polymers CO2 reduction Electrocatalysis Ionothermal Phthalocyanine

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High temperature nanocomposites with photonic group velocity suppression of thermal emission

arXiv

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arXiv 2022年

作者： Mariño-López, Andrea Ameneiro-Prieto, Oscar Vecchio, Drew Xiao, Xiaofei Sousa-Castillo, Ana Pazos-Perez, Nicolas Maier, Stefan A. Giannini, Vincenzo Kotov, Nicholas A. Correa-Duarte, Miguel A. Alvarez-Puebla, Ramon A. Department of Physical Chemistry Universidade de Vigo Vigo36310 Spain CINBIO Universidade de Vigo Vigo36310 Spain Department of Chemical Engineering University of Michigan Ann ArborMI48109 United States Biointerfaces Institute University of Michigan Ann ArborMI48109 United States Department of Physics Imperial College London LondonSW7 2AZ United Kingdom Hybrid Nanosystems Nanoinstitute Munich Faculty of Physics Ludwig-Maximilians Universität München Königinstrasse 10 München80539 Germany Department of Physical and Inorganic Chemistry Universitat Rovira i Virgili Tarragona43007 Spain School of Physics and Astronomy Monash University ClaytonVIC3800 Australia Serrano 121 Madrid28006 Spain Technology Innovation Institute Abu Dhabi Masdar City9639 United Arab Emirates Centre of Excellence ENSEMBLE3 sp. z o.o. Wolczynska 133 Warsaw01-919 Poland Department of Materials Science University of Michigan Ann ArborMI48109 United States Department of Macromolecular Science and Engineering University of Michigan Ann ArborMI48109 United States YpsilantiMI48198 United States ICREA Passeig Lluis Companys 23 Barcelona08010 Spain

Quenching of thermal emission above 0 K is an unusual material property, essential for future energy, transportation, and space technologies. Despite the great effort invested, nearly complete quenching of thermal radiation rather than some reduction of its flux has only been achieved at low temperatures (below 373 K) and in narrow spectral windows using complex techniques suitable only for small scale objects. In this work, we present a light and flexible composite material that can suppress propagating photonic modes and, in this way, quench thermal radiation while preserving heat transfer (by thermal conduction) at a room and higher temperature below 600 K. This has been achieved by altering the local photonic density of states and consequentially the thermal properties of carbon nanotubes forming a percolating nanofiber network with a thermostable polymeric matrix. © 2022, CC BY.

关键词： Quenching

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