The Experts below are selected from a list of 3150 Experts worldwide ranked by ideXlab platform
Norris A Wong - One of the best experts on this subject based on the ideXlab platform.
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speciation of arsenic compounds using high performance liquid chromatography at elevated temperature and selective hydride generation atomic fluorescence detection
Analytical Chemistry, 1996Co-Authors: Norris A WongAbstract:Understanding arsenic toxicity and metabolism requires quantitation of individual arsenic species. However, it has been difficult to separate many biochemically and environmentally important arsenic species on a single chromatography column. We have studied the separation of 11 arsenic compounds by using ion pair chromatography at 30, 50, and 70 °C column temperatures. The use of elevated column temperature improved separation efficiency and dramatically reduced chromatographic retention time for arsenobetaine, arsenocholine, tetramethylarsonium, and arsenosugars. On-line microwave derivatization combined with hydride generation and atomic fluorescence spectrometry (HGAFS) was used for detection, which was able to differentiate more toxic from less toxic arsenic species. The speciation technique was successfully applied to a study of metabolism of arseno sugars present in commercial Seaweed Products. Two uncharacterized arsenic-containing metabolites were detected in urine samples collected 20−33 h after ...
Mauricio Seguel - One of the best experts on this subject based on the ideXlab platform.
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An overview of Seaweed resources in Chile
Journal of Applied Phycology, 1993Co-Authors: M. Avila, Mauricio SeguelAbstract:The Seaweed harvest in Chile has doubled during the past decade, and export values have increased by 300% because of diversification and increase in the volume of Products with greater value added. The export value of Seaweed Products increased from US $18 million in 1980 to $52 million in 1991. During the past decade, the successful cultivation of Gracilaria was implemented, and this has compensated for the large decrease in yields from natural beds. In the short term, it will be necessary to develop techniques for the cultivation of other resources such as Iridaea, Gigartina, Lessonia and Gelidium . Alternative biotechnological methods must also be developed, such as the use of Gracilaria strains with increased quality and production for growth in cultivation centers.
Haruhiko Ito - One of the best experts on this subject based on the ideXlab platform.
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Characterization of a Seaweed-Water Mixture in a Seaweed Processing Plant by Means of a Multiple Light Emitting Diode System
IEEJ Transactions on Electronics Information and Systems, 2009Co-Authors: Fukutaro Nagai, Yuichi Noro, Haruhiko Ito, Takashi TakeoAbstract:An optical system having a set of light emitting diodes with different wavelengths has been applied to the characteristic parameter extraction from a Seaweed-water mixture or slurry in a Seaweed processing plant. The system or extraction method is based on the assumption that the optical transmissions of the mixture at particular wavelengths could be related to Seaweed-product nature or quality. Using this system, we have made optical transmission measurements in a plant and conducted analyses for the parameter extraction, including pigment content estimation and principal component analysis, on the data. The results imply that the principal components or pigment relative content derived from the optical transmission data of the mixture could be useful in characterizing the nature of the final Seaweed Products. One could utilize the obtained information when providing feedback control of the process for improving product quality.
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Optical Evaluation System for a Seaweed-Water Mixture in a Seaweed Processing Plant
2007 IEEE International Symposium on Industrial Electronics, 2007Co-Authors: K. Matsuo, Yuichi Noro, Takashi Takeo, Haruhiko ItoAbstract:An in-process optical measurement system has been proposed for a Seaweed-water mixture in a Seaweed processing plant with the aim of quality evaluation of final Products. The system or method is based on the assumption that the optical transmissions of the mixture at particular wavelengths could be related to Seaweed-product quality. In order to ascertain the above expectation, we have made measurements in a plant and done some analysis, including principal component analysis, on the measurement data. The results imply that the optical transmission data of the mixture can be used to estimate the quality of the final Seaweed Products. The information obtained could also be useful in making a feedback control of the process for producing better Products.
M. Avila - One of the best experts on this subject based on the ideXlab platform.
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An overview of Seaweed resources in Chile
Journal of Applied Phycology, 1993Co-Authors: M. Avila, Mauricio SeguelAbstract:The Seaweed harvest in Chile has doubled during the past decade, and export values have increased by 300% because of diversification and increase in the volume of Products with greater value added. The export value of Seaweed Products increased from US $18 million in 1980 to $52 million in 1991. During the past decade, the successful cultivation of Gracilaria was implemented, and this has compensated for the large decrease in yields from natural beds. In the short term, it will be necessary to develop techniques for the cultivation of other resources such as Iridaea, Gigartina, Lessonia and Gelidium . Alternative biotechnological methods must also be developed, such as the use of Gracilaria strains with increased quality and production for growth in cultivation centers.
Wim M. L. Wesemael - One of the best experts on this subject based on the ideXlab platform.
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Seaweed-based Products from Ecklonia maxima and Ascophyllum nodosum as control agents for the root-knot nematodes Meloidogyne chitwoodi and Meloidogyne hapla on tomato plants
Journal of Applied Phycology, 2016Co-Authors: Bruno Massa Ngala, Yirina Valdes, Giovanni Dos Santos, Roland N. Perry, Wim M. L. WesemaelAbstract:Two commercially available Seaweed Products, derived from Ascophyllum nodosum (An) and Ecklonia maxima (Em), were evaluated for their potential as control agents for the root-knot nematodes, Meloidogyne chitwoodi and Meloidogyne hapla . The effects of both Products on hatching, host location and penetration by second-stage juveniles (J2) were examined. Continuous exposure of M. chitwoodi egg masses to 50 and 100 % An significantly reduced the final percentage hatch, but this result could not be confirmed. In a bioassay with pluronic gel, more J2 of M. chitwoodi and M. hapla were found within the 0.5-cm vicinity of a tomato root tip after 24- and 6-h pre-exposures to Em, respectively. On agar plates, J2 of M. chitwoodi pre-exposed to An or Em showed less attraction to tomato root diffusate compared with distilled water (DW). Moreover, J2 pre-exposed to An lost the ability to differentiate repellent and attractant solutions on agar plates, unlike J2 pre-exposed to Em or DW. A 24-h pre-exposure to An reduced the infectivity of M. chitwoodi and M. hapla , whereas pre-exposure to Em enhanced the infectivity of M. chitwoodi . In a glasshouse pot experiment, treatments with Em reduced M. hapla multiplication on tomato. For M. chitwoodi , no effect on the number of nematodes per gram root was seen. The root biomass significantly reduced for untreated plants infested with M. chitwoodi compared to Em- and An-treated plants. The results indicate that these Seaweed Products adversely affect hatching and sensory perception in in vitro assays, but assumptions about in vivo effects may be unwise as dilutions of the Products when applied as soil drenches may compromise activity.