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Papers
20 resultsShowing papers similar to Simultaneously Acquiring Optical and Acoustic Properties of Individual Microalgae Cells Suspended in Water
ClearSimultaneous Measurement of Polarization and Excitation-Emission Spectrum of Suspended Particles in Water
Researchers developed an optical method capable of simultaneously measuring multi-wavelength polarized light scattering (Stokes parameters) and fluorescence excitation-emission matrix spectra of suspended single particles in water within 125 ns. Testing on microalgae, microplastics, and sediments demonstrated that the multi-wavelength approach outperforms single-wavelength classification for identifying harmful microalgae and other aquatic particulates.
Probing Individual Particles in Aquatic Suspensions by Simultaneously Measuring Polarized Light Scattering and Fluorescence
Researchers developed a portable optical sensor that simultaneously measures polarized light scattering and fluorescence from individual particles in water, enabling classification of microplastics versus microalgae in situ. This dual-measurement approach improves particle identification accuracy compared to single-measurement methods.
Pulse Feature-Enhanced Classification of Microalgae and Cyanobacteria Using Polarized Light Scattering and Fluorescence Signals
Researchers used polarization-sensitive flow cytometry with enhanced pulse feature analysis to classify microalgae and cyanobacteria in mixed samples, training classifiers on optical signatures that distinguish cell types without staining. The method achieved high classification accuracy and offers potential for rapid, label-free phytoplankton monitoring in environmental water samples.
Identification of microplastics in the aquatic environment, or in the presence of algae Chlorella sp., by comparison of biophotonic methods
Researchers compared multiple light-based (biophotonic) methods — including FTIR, Raman spectroscopy, and fluorescence microscopy — for identifying microplastics in water samples containing algae, which can make detection much harder. They found that combining multiple methods improves accuracy and allows for real-world monitoring of microplastics in complex aquatic environments where other organic material is present.
Opportunities in optical and electrical single-cell technologies to study microbial ecosystems
This paper is not about microplastics; it reviews advanced optical (flow cytometry, Raman spectroscopy) and electrical single-cell analysis technologies used to study microbial communities and ecology.
Spectroscopies infrarouge et Raman de microalgues : étude des interactions avec des micro et nanoparticules
Researchers used Raman and infrared spectroscopy to study how freshwater microalgae interact with micro- and nanoparticles including plastics, without requiring extensive sample preparation. These rapid vibrational spectroscopy techniques can detect early cellular effects of particle exposure in organisms at the base of the food chain.
Monitoring Bioindication of Plankton through the Analysis of the Fourier Spectra of the Underwater Digital Holographic Sensor Data
Researchers developed a method to monitor plankton biodiversity using Fourier spectral analysis of plankton images, demonstrating that spectral features of plankton assemblages correlate with species composition and ecosystem health indicators. The approach offers a computationally efficient route to continuous bioindication in marine and freshwater monitoring programs.
Multimodal optical detection and toxicity testing of microplastics in the environment
Researchers combined multiple optical methods — fluorescence, Raman spectroscopy, and biological toxicity assays — into a single integrated platform for detecting microplastics in environmental samples and assessing their biological harm. The multimodal approach enables faster and more comprehensive microplastic characterization than single-method techniques.
Spectroscopic aspects of underwater digital holography of plankton
Researchers demonstrated that underwater digital holography — a technique that captures 3D images of plankton in real time without disturbing them — can monitor the rhythms of plankton populations and detect early signs of ecosystem stress, similar to how spectroscopy reveals the structure of atoms. Shifts in the natural timing patterns of plankton communities can serve as early warning signals of pollution or ecological disruption.
Photonic Microfluidic Technologies for Phytoplankton Research
This review covers photonic microfluidic technologies for studying phytoplankton — microscopic algae that produce half of Earth's oxygen — highlighting how miniaturized optical tools enable single-cell analysis of these ecologically critical organisms.
Microfluidic Impedance Cytometry for Single‐Cell Particulate Inorganic Carbon:Particulate Organic Carbon Measurements of Calcifying Algae
Researchers developed a microfluidic impedance cytometry method to measure the ratio of inorganic to organic carbon in individual calcifying algae cells, enabling single-cell analysis of organisms important for the ocean carbon cycle.
Optimized Classification of Suspended Particles in Seawater by Dense Sampling of Polarized Light Pulses
Researchers developed an optical method using polarized light pulses to classify suspended particles in seawater, aiming to distinguish microplastics from natural particles like algae in situ. A reliable in-water optical sensor for microplastics would greatly improve environmental monitoring capability.
Remote 3D Imaging and Classification of Pelagic Microorganisms with A Short‐Range Multispectral Confocal LiDAR
Researchers developed a new underwater laser-based imaging system capable of identifying and classifying tiny marine organisms in three dimensions from a distance. The device uses multiple light wavelengths to capture detailed images of plankton as small as fractions of a millimeter without requiring physical sample collection. This technology could enable continuous, non-invasive monitoring of plankton communities, which are critical indicators of ocean health.
In-situ Detection Method for Microplastics in Water by Polarized Light Scattering
Researchers developed an in-situ detection method for microplastics in water using polarized light scattering at 120 degrees, enabling real-time measurement of individual particles without sample collection or laboratory processing.
Study the impact of microplastic pollutants on marine algae by novel dielectric spectroscopy method
Researchers developed a PCB coaxial probe-based dielectric spectroscopy method to assess the impact of microplastic pollutants on marine algae at varying concentrations. By measuring changes in the dielectric constant of algae exposed to microplastics, the study demonstrated that this non-destructive technique can rapidly detect and quantify the effects of microplastics on marine algal physiology.
Towards a novel class of photoacoustics-based water contamination sensors
Researchers evaluated photoacoustic spectroscopy (PA) and diffuse reflectance (DR) methods as novel water contamination sensors, testing them on chemical contaminants, microplastic suspensions, and algae cultures in Baltic Sea water. They found that PA offered higher spectral resolution while DR provided better contrast between microplastics and natural biota, suggesting that combining both modalities could yield a powerful class of water pollution sensors.
In Situ Determination of Chlorella Concentration Using Single Entity Electrochemistry
Researchers developed an electrochemical method for detecting individual algal cells in real time using an ultramicroelectrode and single-particle collision technique. The approach could distinguish individual Chlorella cells and relate collision frequency to algal concentration, offering potential for early detection of harmful algal blooms. While not directly focused on microplastics, the method provides a platform for monitoring water quality impacts related to microplastic-linked eutrophication.
Rapidly Measuring Scattered Polarization Parameters of the Individual Suspended Particle with Continuously Large Angular Range
A method was developed to rapidly measure light scattering parameters of individual suspended particles across a wide angular range in a single measurement. The technique was validated using silica microspheres and demonstrated high measurement speed. Rapid characterization of particle optical properties has applications in monitoring suspended sediment, plankton, and microplastics in aquatic environments.
A prototype of a portable optical sensor for the detection of transparent and translucent microplastics in freshwater
Researchers developed a portable prototype optical sensor capable of detecting transparent and translucent microplastics in freshwater by simultaneously measuring specular laser light reflection and transmission, offering a feasibility pathway for field-deployable microplastic monitoring.
Smart polarization and spectroscopic holography for real-time microplastics identification
Researchers developed a new optical imaging system called SPLASH that simultaneously captures polarization, holographic, and texture data from tiny particles — without needing a traditional spectrometer — and used machine learning to identify different types of microplastics with high accuracy. This approach could enable faster, more practical real-time monitoring of microplastic pollution in water.