Genes May Help Reset Circadian Clock

Stroh, M.

doi:10.2307/3976606

Science News

1992

DOI: 10.2307/3976606

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Genes May Help Reset Circadian Clock

M. Stroh¹

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1998

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“…At present, inductively coupled plasma mass spectrometry (ICPMS) provides a unique, powerful, alternative for the determination of REEs in natural samples. , Nevertheless, its application to the determination of REEs at ultratrace concentration level in seawater is limited because highly saline samples can cause both spectral interferences and matrix effects . Therefore, a separation of the matrix components and preconcentration of the analytes are prerequisites.…”

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Preconcentration of Rare Earth Elements in Seawater with Poly(acrylaminophosphonic dithiocarbamate) Chelating Fiber Prior to Determination by Inductively Coupled Plasma Mass Spectrometry

et al. 1998

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A new ion-exchange chelating fiber with aminophosphonic and dithiocarbamate groups based on polyacrylonitrile was developed for the preconcentration of rare earth elements (REEs) in seawater prior to their determination by inductively coupled plasma mass spectrometry. REEs can be easily separated from the high-saline matrix using the fiber. The optimum experimental parameters such as pH, flow rate, sample volume, and effect of matrix ions for preconcentration of REEs were investigated. All REEs in water can be quantitatively retained in the acidity range of pH 3-6 by the fiber and then eluted quantitatively with 0.01 mol L -1 ammonium citrate. The fiber has been applied to the concentration of REEs in seawater. The relative standard deviations for the determination of REEs in seawater at nanogram per liter levels were found to be less than 5%. A reasonably good agreement is obtained with the data reported in the literature.

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confidence: 99%

Preconcentration of Rare Earth Elements in Seawater with Poly(acrylaminophosphonic dithiocarbamate) Chelating Fiber Prior to Determination by Inductively Coupled Plasma Mass Spectrometry

et al. 1998

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Genes May Help Reset Circadian Clock

Cited by 1 publication

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Preconcentration of Rare Earth Elements in Seawater with Poly(acrylaminophosphonic dithiocarbamate) Chelating Fiber Prior to Determination by Inductively Coupled Plasma Mass Spectrometry

Preconcentration of Rare Earth Elements in Seawater with Poly(acrylaminophosphonic dithiocarbamate) Chelating Fiber Prior to Determination by Inductively Coupled Plasma Mass Spectrometry

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