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- 2015
- Xanthomonas oryzae
- multispectral and multimodal microscopy
- spectroscopic imaging
- plant cell diseases
- classification
- rice
- Applied Physics
- University of Sciences, Technique and Technology Bamako
- Institut National Polytechnique Felix Houphou?t-Boigny Yamoussoukro
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Novel Ca2GdTaO6:Mn4+,M (M = Li+, Na+, K+, and Mg2+) red phosphors for plant cultivation light-emitting diodes: Synthesis and luminescence properties
摘要： Recently, Mn4+-activated red phosphors are becoming potential color converters for application in indoor plant cultivation light-emitting diodes, owing to their satisfactory luminescence properties as well as low cost. Herein, novel Mn4+-activated double perovskite-type Ca2GdTaO6 phosphors have been synthesized by a high-temperature solid-state reaction method in air, which exhibited a broad excitation band with two peaks locating at 355 nm and 496 nm in range of 250-600 nm and had an intense red emission peaking at 676 nm due to Mn4+:2Eg→4A2g spin-forbidden transition ranging from 650 to 750 nm under 355 nm excitation. Concentration-dependent luminescence properties were studied. The optimal Mn4+ doping concentration in Ca2GdTaO6 host was 0.004, and the concentration quenching mechanism was determined to be a dipole-dipole interaction among Mn4+ ions. Furthermore, the Ca2GdTaO6:0.004Mn4+ phosphor possessed the internal quantum efficiency up to 33% when excited at 355 nm. Besides, the decay lifetimes of Ca2GdTaO6:Mn4+ presented a reasonable downward trend with increasing Mn4+ concentration. In addition, the effect of charge compensation (co-doping of Li+, Na+, K+, and Mg2+ ions) on the luminescent properties of Ca2GdTaO6:Mn4+ phosphors was also investigated.
关键词： Indoor plant cultivation,Ca2GdTaO6,Mn4+,Double perovskite,Luminescence properties,Red phosphor
更新于2025-11-20 15:33:11
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Proof of concept of plasmonic thermal destruction of surface cancers by gold nanoparticles obtained by green chemistry
摘要： A greener approach for the design of surface plasmon resonant gold nanoparticles has been obtained with a hydrosoluble fraction of an endemic asteraceae medicinal plant. This medicinal plant is originated from Indian Ocean and demonstrates its bioreducing activity in the design of stable green nanomedicine in aqueous media. This article describes the preclinical assessment of the efficacy of these novel nanocandidates on murine model by intratumoral and intravenous injections. It definitely demonstrates two key points in the treatment of cancer: 1) optimization of the tumor microenvironment targeting by specific ligands for a limited damage on healthy tissue, 2) the need to screen the specific irradiation dose (time, power) taking into account the type of tumor.
关键词： Medicinal plant,Hyperthermia,Green nanomedicine,Plasmonic photothermal therapy,Gold nanoparticle
更新于2025-11-14 15:25:21
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SENSITIVITY ANALYSIS OF LIGHT INTERCEPTION TO GEOMETRICAL TRAITS OF APPLE TREES: AN IN SILICO STUDY BASED ON MAPPLET MODEL
摘要： The efficiency of light interception is a driving factor for plant transpiration and photosynthesis, and contributes greatly to plant growth. For a fruit tree, the efficiency of light interception is also a key factor to improve yield quality. Such efficiency is highly dependent on the tree geometrical and topological organisation which may vary between genotypes, or as a result of agronomic practices such as pruning. The purpose of this study was to use a functional-structural plant model, in order to find out the major geometrical traits that influence the efficiency of light interception in apple trees. MAppleT, an architectural model of apple tree, and VPlants, a software library that includes functionalities to simulate light environment, provided the basis for this work. The STAR, namely the silhouette to total area ratio of leaves, was used to evaluate the light interception efficiency. The general methodology contained three steps: (1) manipulation of a set of geometrical parameters in MAppleT, such as those related to internode elongation, leaf area expansion, and branching angle; (2) integration of the resulting tree architecture within the simulated light environment for calculation of STAR values at the whole tree scale; (3) analysis of the influence of the variation of each geometrical trait on the variance of STAR outputs. As expected, leaf area manipulation had the highest impact on STAR values. Interactions between input parameters were also found, and are illustrated in the case of leaf area versus internode length. This suggests that optimal combination(s) of the corresponding traits could be found, setting a target for genetic improvement, as well as physiological studies on real apple trees.
关键词： fruit trees,plant architecture,STAR,functional-structural plant modeling,virtual plants
更新于2025-09-23 15:23:52
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Image based leaf segmentation and counting in rosette plants
摘要： This paper proposes an efficient method to extract the leaf region and count the number of leaves in digital plant images. The plant image analysis plays a significant role in viable and productive agriculture. It is used to record the plant growth, plant yield, chlorophyll fluorescence, plant width and tallness, leaf area, etc. frequently and accurately. Plant growth is a major character to be analyzed among these plant characters and it directly depends on the number of leaves in the plants. In this paper, a new method is presented for leaf region extraction from plant images and counting the number of leaves. The proposed method has three steps. The first step involves a new statistical based technique for image enhancement. The second step involves in the extraction of leaf region in plant image using a graph based method. The third step involves in counting the number of leaves in the plant image by applying Circular Hough Transform (CHT). The proposed work has been experimented on benchmark datasets of Leaf Segmentation Challenge (LSC). The proposed method achieves the segmentation accuracy of 95.4% and it also achieves the counting accuracy of (cid:1)0.7 (DiC) and 2.3 (|DiC|) for datasets (A1, A2 and A3), which are better than the state-of-the-art methods.
关键词： Leaf count,Plant image analysis,Plant phenotyping,Leaf region extraction
更新于2025-09-23 15:23:52
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Highly efficient and thermally stable of a novel red phosphor Sr3NaSbO6:Mn4+ for indoor plant growth
摘要： Far red-emitting Mn4+-activated oxide phosphor based on the substitution of Mn4+ for Sb5+ in the lattice of Sr3NaSbO6 (SNSO) was prepared via solid state reaction process. The crystal structure of the host was carefully discussed and studied. The resultant phosphors were characterized by X-ray powder diffraction, fluorescence spectra, ultraviolet-visible diffuse reflectance spectra, temperature-dependent emission spectra (298–548 K), luminescence decay curves and electroluminescence spectra. Excitation and emission spectra indicated that the sample had a wide excitation band in UV(250–400 nm) and exhibited the strong emission band centered at 695 nm. The band structure for SNSO was calculated based on the density functional theory, and the bandgap value of SNSO host is ～2.92 eV. In addition, the mechanism of quenching concentration and energy-transfer of SNSO:Mn4+ were explored and analyzed in detail through calculation. The UV–Vis diffusion reflectance spectra demonstrated that samples had strong absorption (200–550 nm) in the ultraviolet(UV) and near-ultraviolet (NUV) region. The thermal stability of SNSO:Mn4+ was excellent (I423K/I273K = 39.84%). The internal quantum efficiency is 56.2%. In brief, the prepared phosphors had potential application in indoor plant growth as a LED lamp.
关键词： Sr3NaSbO6:Mn4+,Far red-emitting LED,Photoluminescence,Optical properties,Plant growth
更新于2025-09-23 15:23:52
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Enhanced electrocatalytic production of H2O2 at Co-based air-diffusion cathodes for the photoelectro-Fenton treatment of bronopol
摘要： (Co, S, P)-decorated multiwalled carbon nanotubes (MWCNTs) have been synthesized following a hydrothermal route as electrocatalysts to manufacture large surface area air-diffusion cathodes with carbon cloth as substrate. The enhanced electrocatalytic H2O2 production as compared with Co-free MWCNTs cathodes was demonstrated in a 2.5-L pre-pilot plant with either a RuO2-based or boron-doped diamond (BDD) anode, accumulating between 2- and 3-fold greater H2O2 contents with the catalyzed cathode. The good stability of this new material was ensured from the low Co leaching, with less than 9% Co released to solutions upon repeated usage. Aqueous solutions of the brominated organic preservative bronopol with 0.050 M Na2SO4 at pH 3.0 were comparatively treated by electro-oxidation (EO-H2O2), electro-Fenton (EF), UVA-assisted photoelectro-Fenton (PEF) and solar PEF (SPEF) at constant current density. SPEF with BDD anode and the catalyzed cathode showed the best performance, with total bronopol removal at 210 min and 94% mineralization after 360 min at 40 mA cm-2, thanks to the action of ?OH, BDD(?OH) and sunlight. Formic acid was identified as main reaction by-product, whereas Br and N atoms were mainly converted to Br-, BrO3- and NO3-. Some unidentified organic by-product containing Br and N was formed as well.
关键词： Photoelectro-Fenton process,Bronopol,H2O2 electrogeneration,Wastewater treatment,Pre-pilot plant
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 2nd Colombian Conference on Robotics and Automation (CCRA) - Barranquilla, Colombia (2018.11.1-2018.11.3)] 2018 IEEE 2nd Colombian Conference on Robotics and Automation (CCRA) - Modeling and Simulation of a Grid-Tied 21.0 kWp Real Solar Power Plant as Case Study, Using the VHDL-AMS Language
摘要： This paper presents the utilization of hardware description language VHDL-AMS (Very High-Speed Integrated Circuit plus Hardware Description Language that includes analog and mixed-signal extensions) for modeling and simulation a grid-tied 21.0 kWp real solar power plant, admitted as case study. The case study used in this research consists of a photovoltaic power system with the following features: 1) It has 90 panels of 255 Wp and 3 SMA On Grid inverters, 2) It operates without batteries, and 3) It has a dynamic power controller, called Circuitor (CDP-0), to guarantee zero injection into the grid. The main contribution of this work is modeling and simulation of a grid-tied real solar power plant, using the VHDL-AMS language (with the support of software SystemVision?), in order to develop a simulating tool capable to find the real electrical energy generation in a photovoltaic system, considering the monthly averaged direct normal radiation and the solar panel characteristics. This paper aims to present the first major developments for the future construction of a bigger VHDL-AMS tool that will allow the simulation of photovoltaic power systems, operating in a synergic way with hydroelectric power plants previously built, with the aim of optimize the coordinated operation between hydropower and solar energy, for periods of rain and hydrological drought.
关键词： Solar Power Plant,Hardware description languages,VHDL-AMS Language,Photovoltaic systems
更新于2025-09-23 15:23:52
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[IEEE 2018 IEEE 38th Central America and Panama Convention (CONCAPAN XXXVIII) - San Salvador, El Salvador (2018.11.7-2018.11.9)] 2018 IEEE 38th Central America and Panama Convention (CONCAPAN XXXVIII) - Sombreamiento de terrenos compartidos: plantas solares fotovoltaicas y cultivos Shared Fields Shading: Solar Power Plants and Crops
摘要： There is a global increasing trend to install fixed photovoltaic (PV) power plants on the ground. Its environmental impact compels us to think about other options on how to handle the soil use. This research examines a combination of a power plant and a secondary product, like a crop that actually requires shading to grow or improve its output. This kind of mix (PV&crops) is already under research, but no research initiative under the same focus was found in Latin America. This article reviews the traditional systems applied in agriculture to provide shading to crops (shade net and agroforestry), they are compared with a solar photovoltaic plant installed over the crop, and possible benefits are analyzed. Also, regional crops were studied where shading of a photovoltaic plant could provide benefits, a study of the final radiation distribution of a test plant was done. This research is part of an effort to establish value on new sustainable techniques in order to reduce the environmental impact of a photovoltaic power plant.
关键词： crops,shared use,soil use,photovoltaic energy,solar plant
更新于2025-09-23 15:23:52
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A Continuous Synthesis of Polymethylmethacrylate Using a Microreactor Plant
摘要： We applied a microreactor to the synthesis of polymethylmethacrylate (PMMA) using a laboratory microreactor system with a production volume of 2–3 t per year, which enabled pseudo-continuous feeding by syringe pumps. When using a tube made of stainless steel, the values of the yield, number average molecular weight (Mn), and polydispersity index (PDI) reached 75.2%, 9.4×103, and 1.88, respectively. These results were in good accordance with the reported ones and a product with comparable properties was obtained. Then, we performed a continuous synthesis of PMMA for 8 h using a medium scale microreactor plant with a production volume of 100 t per year, which provided continuous feeding by triple cam driven pumps. When using a tube made of polytetrafluoroethylene (PTFE), it was confirmed that a product was continuously obtained for 8 h, whose yield, Mn, and PDI were on average 66.2%, 8.8×103, and 1.95, respectively. The variation in the yield, Mn, and PDI was within 5.7%, 4.5%, and 1.0%, respectively. For comparison, when using the laboratory microreactor system under the same reaction condition with a tube made of PTFE, the corresponding values of the yield, Mn, and PDI were 66.5%, 8.4×103, and 2.04, respectively. The difference in the results between the above two microreactor systems was 4.8% at a maximum (in Mn). Therefore, the synthesis of PMMA was continuously performed using the medium scale microreactor plant and the comparability of the reaction performance between the above two microreactor systems was ensured.
关键词： Microreactor Plant,Microreactor,Polymethylmethacrylate,Polymerization Reaction
更新于2025-09-23 15:23:52
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Native mass spectrometry reveals the conformational diversity of the UVR8 photoreceptor
摘要： UVR8 is a plant photoreceptor protein that regulates photomorphogenic and protective responses to UV light. The inactive, homodimeric state absorbs UV-B light, resulting in dissociation into monomers, which are considered to be the active state and comprise a β-propeller core domain and intrinsically disordered N- and C-terminal tails. The C terminus is required for functional binding to signaling partner COP1. To date, however, structural studies have only been conducted with the core domain where the terminal tails have been truncated. Here, we report structural investigations of full-length UVR8 using native ion mobility mass spectrometry adapted for photoactivation. We show that, while truncated UVR8 photoconverts from a single conformation of dimers to a single monomer conformation, the full-length protein exists in numerous conformational families. The full-length dimer adopts both a compact state and an extended state where the C terminus is primed for activation. In the monomer the extended C terminus destabilizes the core domain to produce highly extended yet stable conformations, which we propose are the fully active states that bind COP1. Our results reveal the conformational diversity of full-length UVR8. We also demonstrate the potential power of native mass spectrometry to probe functionally important structural dynamics of photoreceptor proteins throughout nature.
关键词： intrinsically disordered proteins,plant photoreception,UVR8,native mass spectrometry,ion mobility
更新于2025-09-23 15:23:52