The Experts below are selected from a list of 65733 Experts worldwide ranked by ideXlab platform
Ján Horák - One of the best experts on this subject based on the ideXlab platform.
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Laser Diffraction as An Innovative Alternative to Standard Pipette Method for Determination of Soil Texture Classes in Central Europe
Water, 2020Co-Authors: Dušan Igaz, Elena Aydin, Miroslava Šinkovičová, Vladimír Šimanský, Andrej Tall, Ján HorákAbstract:The paper presents the comparison of soil particle size distribution determined by standard pipette method and Laser Diffraction. Based on the obtained results (542 soil samples from 271 sites located in the Nitra, Vah and Hron River basins), regression models were calculated to convert the results of the particle size distribution by Laser Diffraction to pipette method. Considering one of the most common soil texture classification systems used in Slovakia (according to Novak), the emphasis was placed on the determination accuracy of particle size fraction
Richard L Lieber - One of the best experts on this subject based on the ideXlab platform.
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Polarization gating enables sarcomere length measurements by Laser Diffraction in fibrotic muscle
Journal of biomedical optics, 2014Co-Authors: Kevin W. Young, Sudarshan Dayanidhi, Richard L LieberAbstract:Sarcomere length is a key parameter commonly measured in muscle physiology since it dictates striated muscle active force. Laser Diffraction (LD)–based measurements of sarcomere length are time-efficient and sample a greater number of sarcomeres compared with traditional microscopy–based techniques. However, a limitation to LD techniques is that signal quality is severely degraded by scattering events as photons propagate through tissue. Consequently, sarcomere length measurements are unattainable when the number of scattering events is sufficiently large in muscle tissue with a high scattering probability. This occurs in fibrotic skeletal muscle seen in muscular dystrophies and secondary to tissue trauma, thus eliminating the use of LD to study these skeletal muscle ailments. Here, we utilize polarization gating to extract diffracted signals that are buried in noise created by scattering. Importantly, we demonstrate that polarization-gated Laser Diffraction (PGLD) enables sarcomere length measurements in muscles from chronically immobilized mice hind limbs; these muscles have a substantial increase of intramuscular connective tissue that scatter light and disable sarcomere length measurements by traditional LD. Further, we compare PGLD sarcomere lengths to those measured by bright field (BF) and confocal microscopy as positive controls and reveal a significant bias of BF but not of confocal microscopy.
Merrill Seymour Goldenberg - One of the best experts on this subject based on the ideXlab platform.
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Micrometer-scale particle sizing by Laser Diffraction: critical impact of the imaginary component of refractive index.
Pharmaceutical research, 2005Co-Authors: Beekman Alice C, Daxian Shan, Alana Ali, Weiguo Dai, Stephen Ward-smith, Merrill Seymour GoldenbergAbstract:Purpose. This study evaluated the effect of the imaginary component of the refractive index on Laser Diffraction particle size data for pharmaceutical samples.
S Chandra - One of the best experts on this subject based on the ideXlab platform.
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adequacy of Laser Diffraction for soil particle size analysis
PLOS ONE, 2017Co-Authors: Peter Fisher, Craig Aumann, Kohleth Chia, Nick Ohalloran, S ChandraAbstract:Sedimentation has been a standard methodology for particle size analysis since the early 1900s. In recent years Laser Diffraction is beginning to replace sedimentation as the prefered technique in some industries, such as marine sediment analysis. However, for the particle size analysis of soils, which have a diverse range of both particle size and shape, Laser Diffraction still requires evaluation of its reliability. In this study, the sedimentation based sieve plummet balance method and the Laser Diffraction method were used to measure the particle size distribution of 22 soil samples representing four contrasting Australian Soil Orders. Initially, a precise wet riffling methodology was developed capable of obtaining representative samples within the recommended obscuration range for Laser Diffraction. It was found that repeatable results were obtained even if measurements were made at the extreme ends of the manufacturer’s recommended obscuration range. Results from statistical analysis suggested that the use of sample pretreatment to remove soil organic carbon (and possible traces of calcium-carbonate content) made minor differences to the Laser Diffraction particle size distributions compared to no pretreatment. These differences were found to be marginally statistically significant in the Podosol topsoil and Vertosol subsoil. There are well known reasons why sedimentation methods may be considered to ‘overestimate’ plate-like clay particles, while Laser Diffraction will ‘underestimate’ the proportion of clay particles. In this study we used Lin’s concordance correlation coefficient to determine the equivalence of Laser Diffraction and sieve plummet balance results. The results suggested that the Laser Diffraction equivalent thresholds corresponding to the sieve plummet balance cumulative particle sizes of < 2 μm, < 20 μm, and < 200 μm, were < 9 μm, < 26 μm, < 275 μm respectively. The many advantages of Laser Diffraction for soil particle size analysis, and the empirical results of this study, suggest that deployment of Laser Diffraction as a standard test procedure can provide reliable results, provided consistent sample preparation is used.
Dušan Igaz - One of the best experts on this subject based on the ideXlab platform.
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Laser Diffraction as An Innovative Alternative to Standard Pipette Method for Determination of Soil Texture Classes in Central Europe
Water, 2020Co-Authors: Dušan Igaz, Elena Aydin, Miroslava Šinkovičová, Vladimír Šimanský, Andrej Tall, Ján HorákAbstract:The paper presents the comparison of soil particle size distribution determined by standard pipette method and Laser Diffraction. Based on the obtained results (542 soil samples from 271 sites located in the Nitra, Vah and Hron River basins), regression models were calculated to convert the results of the particle size distribution by Laser Diffraction to pipette method. Considering one of the most common soil texture classification systems used in Slovakia (according to Novak), the emphasis was placed on the determination accuracy of particle size fraction
