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Propolis nanoemulsion extract from celebes stingless bee (Tetragonula biroi) phytochemistry and antibacterial analysis to periodontopathogen bacteria

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Journal of Oral Biology and Craniofacial Research 2025年第3期15卷 576-584页

作者： Amalia, Nadya Rafika Budhy, Theresia Indah Ridwan, Rini Devijanti Rianti, Devi Bramantoro, Taufan Luthfi, Muhammad Ramadhani, Nastiti Faradilla Pramusita, Adya Putranti, Nurul Aisyah Rizki Nugraha, Albertus Putera Situmorang, Putri Cahaya Shariff, Khairul Anuar Nugraha, Alexander Patera Dental Health Science Study Program Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Department of Oral and Maxillofacial Pathology Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Department of Oral Biology Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Department of Dental Material Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Department of Dental Public Health Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Department of Dentomaxillofacial Radiology Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Department of Orthodontic Faculty of Dental Medicine Universitas Airlangga Surabaya Indonesia Faculty of Medicine Universitas Airlangga Surabaya Indonesia Biology Study Program Faculty of Mathematics and Natural Sciences Universitas Sumatera Utara Medan Indonesia School of Materials and Mineral Resources Engineering Engineering Campus Universiti Sains Malaysia Penang Nibong Tebal 14300 Malaysia

Background: Propolis from Sulawesi's stingless bees (Tetragonula biroi) contains antioxidants, more flavonoids than propolis from Apis bees, and the antibacterial ability. Objective: to examine the antibacterial properties of Propolis Nanoemulsion Extract (PNE), which is extracted from the Celebes Stingless Bee (T. biroi), in relation to the periodontopathogen bacteria such as Fusobacterium nucleatum (Fn), Porphyromonas gingivalis (Pg), Aggregatibacter actinomycetemcomitans (Aa), and Provotella intermedia (Pi). This investigation also examines PNE's phytochemistry, particle size analysis (PSA), and zeta potential. Methods: The maceration process with 96 % ethanol was used to create PNE from Celebes stingless bee (T. biroi), which was then subjected to zeta potential measurement and PSA. Phytochemical analysis was used to identify phytochemical constituents in the PNE (T. biroi). Diffusion zone, minimum bactericidal concentration (MBC), and minimum inhibitory concentration (MIC) were used to assess antibacterial efficacy against Aa, Pg, Pi, and Fn. Furthermore, the statistical analysis was used to extract the data. Results: Phenols, alkaloids, and flavonoids were identified;however, triterpenoids and saponins were not. Between 151.28 and 182.2 diameter nanometers (***) was the range of the PNE's diameter. At 1.56 % propolis (T. biroi) concentration, the MIC, MBC, and diffusion zone analysis performed better than at 0.76 %, with a significant difference (p:0.01;p < 0.05) to Aa, Pg, Pi, and Fn. Conclusions: The highest antibacterial activity against Aa, Pg, Pi, and Fn as periodontopathogen bacteria is demonstrated by alkaloids, flavonoids, and phenols in PNE from Celebes (T. biroi) at a concentration of 1.56 %. © 2025 The Authors

关键词： Antibacterial Communicable disease Infectious disease Medicine Periodontal disease

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GPU Implementation of a Gas-Phase Chemistry Solver in the CMAQ Chemical Transport Model

ACS ES&T air

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ACS ES&T air 2025年第2期2卷 226-235页

作者： Duncan Quevedo Khanh Do George Delic José Rodríguez-Borbón Bryan M Wong Cesunica E Ivey Department of Civil and Environmental Engineering University of California Berkeley California 94720 United States. Department of Chemical and Environmental Engineering University of California Riverside California 92557 United States. Center for Environmental Research and Technology Riverside California 92507 United States. Hiperism Consulting LLC Chapel Hill North Carolina 27514 United States. Department of Chemistry Department of Physics & Astronomy and Material Science & Engineering Program University of California Riverside California 92557 United States.

The Community Multiscale Air Quality (CMAQ) model simulates atmospheric phenomena, including advection, diffusion, gas-phase chemistry, aerosol physics and chemistry, and cloud processes. Gas-phase chemistry is often a major computational bottleneck due to its representation as large systems of coupled nonlinear stiff differential equations. We leverage the parallel computational performance of graphics processing unit (GPU) hardware to accelerate the numerical integration of these systems in CMAQ's CHEM module. Our implementation, dubbed CMAQ-CUDA, in reference to its use in the Compute Unified Device Architecture (CUDA) general purpose GPU (GPGPU) computing solution, migrates CMAQ's Rosenbrock solver from Fortran to CUDA Fortran. CMAQ-CUDA accelerates the Rosenbrock solver such that simulations using the chemical mechanisms RACM2, CB6R5, and SAPRC07 require only 51%, 50%, or 35% as much time, respectively, as CMAQv5.4 to complete a chemistry time step. Our results demonstrate that CMAQ is amenable to GPU acceleration and highlight a novel Rosenbrock solver implementation for reducing the computational burden imposed by the CHEM module.

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INVERSE DELTA-DOPING FOR IMPROVEMENT OF SOLAR-CELLS

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JOURNAL OF APPLIED PHYSICS 1994年第10期75卷 5095-5101页

作者： BOER, KW PIPREK, J Material Science Program College of Engineering University of Delaware Newark Delaware 19716

Delta doping with deep-level centers results in a marked, decrease of open-circuit voltage and fill factor of photodiodes and solar cells when the doped layer is located near the crossover of electron and hole densities. The omission of recombination centers in a thin layer (inverse delta doping) at this position consequently causes an increase of the open-circuit voltage. The difficulty of improving the open-circuit voltage in actual high-efficient solar cells may have its origin in the inadvertent creation of donor-acceptor pairs caused by cross doping and consequent compensation. Such pairs are known to act as efficient recombination centers. The insertion of a thin, undoped interlayer is proposed to separate donors and acceptors and thereby reduce the density of close pairs.

关键词： SOLAR CELLS DOPED materialS OPEN?CIRCUIT VOLTAGE PHOTODIODES FILL FACTOR RECOMBINATION LAYERS

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Heteroatom co-doped green pea peel-derived biochar for high-performance energy storage applications

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RSC Advances 2025年第20期15卷 15819-15831页

作者： Wasiu Olakunle Makinde Mohsen A. Hassan Wael M. Semida Ying Pan Guoqing Guan Nieves López-Salas Ahmed S. G. Khalil Materials Science and Engineering Program Egypt-Japan University of Science and Technology (E-JUST) New Borg El-Arab City Alexandria Egypt Horticulture Department Faculty of Agriculture Fayoum University Fayoum Egypt Sustainable Material Chemistry Chemistry Department Paderborn University Warburger Str. 100 Germany Energy Conversion Engineering Laboratory Institute of Regional Innovation (IRI) Hirosaki University 3-Bunkyocho Hirosaki 036-8561 Japan Environmental and Smart Technology Group Faculty of Science Fayoum University Fayoum Egypt EvoSmarTec GmbH Alfredstr. 81 45130 Essen Germany

Green pea peel (GPP) is a waste, and it is abundant and available to be used for biochar synthesis. GPP-derived biochar (GP) is used vastly in wastewater treatment. Moreover, heteroatom co-doping of GP could be better than its single-doped and undoped in enhancement of active sites and conductivity, and in developing electrodes for supercapacitor applications. However, uncontrolled heteroatom co-doping clogs the pores in the biochar and stops the electrolyte from penetrating the porous structure, which results in reduced capacitance and higher resistance in the biochar. This study presented the controlled synthesis of GP, nitrogen (N)-doped biochar (NGP), and N and sulfur (S) ex situ co-doped GP (NSGP) through carbonization and chemical activation. As revealed by the characterization techniques, the synthesized GP, NGP, and NSGP are nanosheets with amorphous structures and defective structures. The specific capacitance of the NSGP-based electrode material, as determined by electrochemical characterizations, is 257.01 F g⁻¹, more than the 230.22 F g⁻¹ and 208.78 F g⁻¹ of NGP and GP at 1 A g⁻¹, respectively. The assembled NSGP//NSGP supercapacitor device has an 80.25 F g⁻¹ specific capacitance at 1 A g⁻¹, an energy density of 13.87 W h kg⁻¹, and a 500 W kg⁻¹ power density with a 99.46% capacity retention after 5000 cycles at 5 A g⁻¹. It demonstrates that NSGP has better electrochemical performance than NGP and GP because of the improved active sites and conductivity.

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Porous silicon on paper sensors: Factors affecting biosensing performance

Porous silicon on paper sensors: Factors affecting biosensin...

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Frontiers in Biological Detection: From Nanosensors to Systems XVII 2025

作者： An, Huijin Laibinis, Paul E. Locke, Andrea K. Weiss, Sharon M. Interdisciplinary Material Science Program Vanderbilt University NashvilleTN37235 United States Department of Electrical and Computer Engineering Vanderbilt University NashvilleTN37235 United States Department of Chemical and Biomolecular Engineering Vanderbilt University NashvilleTN37235 United States Department of Chemistry Vanderbilt University NashvilleTN37235 United States Department of Biomedical Engineering Vanderbilt University NashvilleTN37235 United States

ISBN: (纸本)9781510684249

A paper-based biosensor integrating a functionalized porous silicon (PSi) membrane as the active sensing element for quantifiable protein detection has been developed. For similar short-time exposures to an analyte, improved molecular transport in PSi membranes when on paper leads to larger signal changes compared to traditional PSi films that remain on a silicon substrate. In this work, we discuss controlling the incubation time of the analyte and the overall testing time of the sensor by incorporating different combinations of wicking and absorbent paper beneath the PSi membrane. With this control, the PSi-on-paper sensor platform has the potential to serve as an effective low-cost rapid diagnostic test with highly sensitive, quantitative readout for a wide range of analytes. © 2025 SPIE.

关键词： Porous silicon

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Dual-compressed photoacoustic single-pixel imaging

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National science Review 2023年第1期10卷 187-195页

作者： Yuning Guo Baowen Li Xiaobo Yin Department of Mechanical Engineering University of Colorado Department of Material Science and Engineering Department of Physics Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Materials Science and Engineering Program University of Colorado

Photoacoustic imaging,an acoustic imaging modality with potentially optical resolution in an optical turbid medium,has attracted great ***,the convergence of wavefront optimization and raster scanning in computational photoacoustic imaging leads to the challenge of fast mapping,especially for a spatial resolution approaching the acoustic deep-subwavelength *** a sparse sampling paradigm,compressive sensing has been applied in numerous fields to accelerate data acquisition without significant quality *** this work,we propose a dual-compressed approach for photoacoustic surface tomography that enables high-efficiency imaging with 3D spatial resolution unlimited by the acoustics in a turbid *** dual-compressed photoacoustic imaging with single-pixel detection,enabled by spatially optical modulation with synchronized temporally photoacoustic coding,allows decoding of the fine optical information from the modulated acoustic signal even when the variance of original photoacoustic signals is *** perform a proof-of-principle numerical demonstration of dual-compressed photoacoustic imaging, that resolves acoustic sub-acoustic-wavelength details with a significantly reduced number of measurements,revealing the potential for dynamic *** dual-compressed concept,which transforms unobtrusive spatial difference into spatio-temporal detectable information,can be generalized to other imaging modalities to re alize efficient,high-spatial-resolution imaging.

关键词： photoacoustic imaging compressive sensing single-pixel imaging surface tomography

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IMPRESSION CREEP OF A THIN-FILM BY VACANCY DIFFUSION .2. CYLINDRICAL PUNCH

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JOURNAL OF APPLIED PHYSICS 1993年第7期74卷 4390-4397页

作者： YANG, FQ LI, JCM Material Science Program Department of Mechanical Engineering University of Rochester Rochester New York 14627

The diffusion problem in the impression creep of a thin film by a cylindrical punch is analyzed. It is found that at low stresses the impression velocity is proportional to the punching stress. For the same punching stress and the same punch radius the impression velocity decreases for a rigid substrate, and increases without the substrate as the thickness of film decreases. Two limiting cases for the rigid substrate agree with the previous work, namely, the impression velocity is inversely proportional to the punch radius for impression creep of a half-space, and inversely proportional to the square of the punch radius for impression creep of a thin film. Without the substrate the impression velocity for impression creep of a thin film is inversely proportional to the thickness of the film and independent of the punch radius.

关键词： THIN FILMS CREEP VACANCIES DIFFUSION STRESSES THICKNESS

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IMPRESSION AND DIFFUSIONAL CREEP OF ANISOTROPIC MEDIA

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JOURNAL OF APPLIED PHYSICS 1995年第1期77卷 110-117页

作者： YANG, FQ LI, JCM Material Science Program Department of Mechanical Engineering University of Rochester Rochester New York 14627

Some diffusion problems in the impression and diffusional creep of aniostropic materials are analyzed. It is found that at the limit of low stress, both the diffusional creep rate and impression velocity are proportional to the applied stress. For a parallelepiped crystal under simple tension or compression in teh Z direction, the diffusional creep rate depends on all three principal diffusivities, D//X, D//Y, and D//Z. Two limiting cases depend on the quantity √D//XD//Y/D//X. When this quantity is large the creep rate is proportional to √D//Z but when it is small the creep rat eis independent of D//Z. For a cylindrical crystal under tension or compression in the axial Z direction, the creep rate depends on D//r/D//Z. When the ratio is large, the creep rate is the same as the isotroic case except that the effective diffusivity is √C//rD//Z. When the ratio is small, the creep rate is proportional to D//r and independent of D//Z. For the impression creep of a half-space the punch velocity is proportional to the geometric mean of the principal diffusivities parallel and perpendicular to the loading direction, nd inversely proportional to the punch dimension. For impression creep of a thin film deposited on an impermeable substrate under the same punching stress the impression velocity is dependent only on the diffusivity parallel to the thin film, and inversely proportional to the square of the punch dimension. Without the substrate, the impression velocity is dependent only on the diffusivity p

关键词： DIFFUSION ANISOTROPY CREEP (materials)

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IMPRESSION TEST OF 63SN-37PB EUTECTIC ALLOY

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materialS science AND engineering A-STRUCTURAL materialS PROPERTIES MICROSTRUCTURE AND PROCESSING 1995年第1-2期201卷 40-49页

作者： YANG, FG LI, JCM YANG, FQ Material Science Program Department of Mechanical Engineering University of Rochester Rochester NY 14627 USA

Impression creep and stress relaxation experiments on the Sn-Pb eutectic alloy were carried out in the RSA II instrument modified to use a 0.5 mm diameter cylindrical punch under 1.5-47 MPa punching stress and within a temperature range of 25 degrees C to 110 degrees C. Based on a power law between the impression velocity and stress or between the stress rate and stress, the exponent increased with stress from 1 to 3.5 within the temperature range 80-110 degrees C and 2.5 to 6 within the range 25-65 degrees C. These exponents were generally comparable to those reported in the literature. Because of the change of stress exponent, several mechanisms have been proposed. However, the stress dependence was found to obey a hyperbolic sine function of stress for all the stresses and temperatures studied. Similarly before using the hyperbolic sine function, the activation energy was found to increase with stress, an abnormal behaviour. Fortunately, after using the hyperbolic sine function, a single activation energy, 55 kJ mol(-1) was obtained. Based on the present data, a single mechanism of interfacial viscous shearing between the two eutectic phases is proposed for both creep and stress relaxation. In addition to the effect of stress and temperature, the impression velocity based on this model should be directly proportional to the punch radius and inversely proportional to the nth (n = 1-3) power of the size of phase particles. These predictions are consistent with available information in the literature.

关键词： IMPRESSION CREEP STRESS RELAXATION SN-PB EUTECTIC ALLOY

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IMPRESSION CREEP BY AN ANNULAR PUNCH

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MECHANICS OF materialS 1995年第1期21卷 89-97页

作者： YANG, FQ LI, JCM Material Science Program Department of Mechanical Engineering University of Rochester Rochester NY 14627 USA

The diffusion problem of impression creep of a half-space by an annular punch is analyzed. The results indicate that, at low stresses, the impression velocity is proportional to the punching stress. For the same punching stress the impression velocity increases without limit as the annular thickness approaches zero. The limiting case for a solid punch agrees with previous results, namely, (1) the impression velocity for interface diffusion is inversely proportional to the square of the punch radius, and (2) that for bulk diffusion the impression velocity is inversely proportional to the punch radius. For a thin annular punch, the impression velocity reduces to that of impression creep by a straight punch, i.e., the impression velocity for interface diffusion is inversely proportional to the square of the thickness of the annular punch, and that for bulk diffusion it is inversely proportional to the thickness of the annular punch. In fact, the straight punch is a good approximation (larger by less than 5%) if the inner radius/outer radius ratio is larger than 0.1 for interface diffusion and 0.2 for bulk diffusion.

关键词： CREEP DIFFUSION ANNULAR PUNCH IMPRESSION INDENTATION

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