Fossil mollusk shell organic matrix components preserved for 80 million years

Paleobiology ◽  
1979 ◽  
Vol 5 (2) ◽  
pp. 144-150 ◽  
Author(s):  
S. Weiner ◽  
H. A. Lowenstam ◽  
B. Taborek ◽  
L. Hood
Keyword(s):  
Ion Exchange ◽  
Upper Cretaceous ◽  
Exchange Resin ◽  
Organic Matrix ◽  
Ion Exchange Resin ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Diagenetic Alteration ◽  
Matrix Components ◽  
Shell Organic Matrix

The organic matrix components of a fossil ammonoid shell from the Upper Cretaceous, can be separated into sub-fractions which are generally comparable to those found in extant Nautilus, using ion exchange chromatography. This suggests that at least portions of these components are sufficiently well preserved to interact characteristically with the ion exchange resin. Amino acid compositions of these sub-fractions, however, do not resemble Nautilus organic matrix sub-fractions, indicating that considerable diagenetic alteration of this material has taken place.

Improved Synthesis and Rapid Isolation of Millimole Quantities of Adenylylsulfate

1979 ◽  
Vol 34 (5-6) ◽  
pp. 346-349 ◽  
Author(s):  
Bryan P. Cooper ◽  
Hans G. Trüper
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Thiobacillus Denitrificans ◽  
Enzymatic Method ◽  
Rapid Isolation ◽  
Aps Reductase

Abstract An improved enzymatic method for the synthesis of adenylylsulfate (APS) from adenosine 5′-phosphate using APS-reductase from Thiobacillus denitrificans is described. Isolation of millimole quantitities of this sulfur nucleotide is achieved rapidly by means of ion exchange chromatography on a strongly basic ion exchange resin. A facile and reproducible desalting procedure is described.

REMOVAL OF HOST ANTIGENS FROM PLANT VIRUS PREPARATIONS BY ION EXCHANGE CHROMATOGRAPHY

1961 ◽  
Vol 39 (7) ◽  
pp. 1705-1709 ◽  
Author(s):  
J. H. Tremaine
Keyword(s):  
Ion Exchange ◽  
Plant Virus ◽  
Analytical Ultracentrifugation ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Plant Viruses ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Ultraviolet Spectrophotometry ◽  
Serological Tests

The separation of a carnation virus from smaller cowpea-host antigens was achieved by column chromatography on a strongly basic ion-exchange resin. The separation was demonstrated by infectivity and serological tests, analytical ultracentrifugation, and ultraviolet spectrophotometry. The method is proposed for the removal of similar host components from preparations of other spherical plant viruses.

scholarly journals A study of ion-exchange chromatography in an expanded bed for bovine albumin recovery

2009 ◽  
Vol 52 (2) ◽  
pp. 427-436 ◽  
Author(s):  
João Batista Severo Jr. ◽  
Roberto Rodrigues de Souza ◽  
José Carlos Curvelo Santana ◽  
Elias Basile Tambourgi
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Binding Capacity ◽  
Ion Exchange Resin ◽  
Exchange Chromatography ◽  
Expanded Bed Adsorption ◽  
Expanded Bed ◽  
Bed Height ◽  
Salt Addition ◽  
Bed Expansion

In the present work, the effect of bed expansion on BSA adsorption on Amberlite IRA 410 ion-exchange resin was studied. The hydrodynamic behavior of an expanded bed adsorption column on effects of the biomolecules and salt addition and temperature were studied to optimize the conditions for BSA recovery on ion-exchange resin. Residence time distribution showed that HEPT, axial dispersion and the Pecletl number increased with temperature and bed height, bed voidage and linear velocity. The binding capacity of the resin increased with bed height. The Amberlite IRA 410 ion-exchange showed an affinity for BSA with a recovery yield of 78.36 % of total protein.

False-negative results for urinary phenothiazines and imipramine in Forrest's qualitative assays.

1980 ◽  
Vol 26 (2) ◽  
pp. 345-347 ◽  
Author(s):  
G P James ◽  
M H DJang ◽  
H H Hamilton
Keyword(s):  
Ascorbic Acid ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
False Negative ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Negative Results ◽  
False Negative Results

Abstract When a series of patients' urine samples supplemented in vitro with chlorpromazine or imipramine was assayed with the Forrest qualitative assays, we observed an occasional false-negative result, which we found was attributable to interference by ascorbic acid. It interferes with the reagent, not with the analytes, in both assays. We easily eliminated this interference with the phenothiazine test by using an anion-exchange resin. Eliminating the interference with the assay for imipramine, however, is more difficult; false-negative results can be obtained even after ion-exchange chromatography if the imipramine concentration is less than 50 mg/L.

Separation and quantification of 90Sr from ion-exchange resin radioactive waste: methods and techniques of analysis

2020 ◽  
Vol 108 (8) ◽  
pp. 627-640
Author(s):  
Aurelia Magdalena Dianu ◽  
Relu Ion Dobrin
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Extraction Process ◽  
Ion Exchange Resin ◽  
Exchange Chromatography ◽  
Chemical Recovery ◽  
Convincing Argument ◽  
Sample Decomposition ◽  
Pre Treatment ◽  
Chromatographic Extraction

AbstractFour methods for 90Sr separation from spent ion-exchange resin samples were carried out, offering a useful methodology to achieve interferences free 90Sr fractions. The four methods consist in resin sample decomposition, pre-treatment and selective separation of 90Sr by using: (a) a single chromatographic extraction process, (b) double chromatographic extraction, (c) a single chromatographic extraction process followed in sequence by two precipitations, and (d) ion-exchange chromatography, followed by extraction chromatography and precipitation. Mineralization by microwave acid digestion and the four 90Sr separation methods thoroughly presented are available. Data processing methods (adjustable modified efficiency tracing – a new improved approach for the efficiency tracing LSC technique, non-linear regression and α-β discrimination) to obtain the activities values of α, β-γ, pure β emitters and the evaluation of chemical recovery yield of strontium were presented. A discussion about activity assessment in 90Sr purified fractions, providing a convincing argument to support the accuracy of the 90Sr separation methods, is also offered.

False-negative results for urinary phenothiazines and imipramine in Forrest's qualitative assays.

1980 ◽  
Vol 26 (2) ◽  
pp. 345-347
Author(s):  
G P James ◽  
M H DJang ◽  
H H Hamilton
Keyword(s):  
Ascorbic Acid ◽  
Ion Exchange ◽  
Exchange Resin ◽  
Anion Exchange Resin ◽  
False Negative ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Negative Results ◽  
False Negative Results

Abstract When a series of patients' urine samples supplemented in vitro with chlorpromazine or imipramine was assayed with the Forrest qualitative assays, we observed an occasional false-negative result, which we found was attributable to interference by ascorbic acid. It interferes with the reagent, not with the analytes, in both assays. We easily eliminated this interference with the phenothiazine test by using an anion-exchange resin. Eliminating the interference with the assay for imipramine, however, is more difficult; false-negative results can be obtained even after ion-exchange chromatography if the imipramine concentration is less than 50 mg/L.

THE PARTIAL SEPARATION OF Na22 FROM Na24 BY ION EXCHANGE CHROMATOGRAPHY

1956 ◽  
Vol 34 (1) ◽  
pp. 65-74 ◽  
Author(s):  
R. H. Betts ◽  
W. E. Harris ◽  
Margaret D. Stevenson
Keyword(s):  
Hydrochloric Acid ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Isotope Effects ◽  
Cation Exchange Resin ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Partial Separation ◽  
Chloride Salts

Mixtures of the radionuclides Na22 and Na24, as the chloride salts, have been partially separated by chromatographic methods. A column 102 cm. in length containing the cation exchange resin Dowex 50 was used. The eluant was 0.7 M hydrochloric acid. Na22 is held more strongly by the resin than is Na24. The most effective separations were obtained at 25 °C and 5.5 °C.; experiments at 48 °C and 68 °C showed much smaller isotope effects.

The non-protein nitrogen composition of grass silages: I. The estimation of the basic amino acids and non-volatile amines by chromatography on a weak cation exchange resin

1969 ◽  
Vol 72 (3) ◽  
pp. 459-466 ◽  
Author(s):  
A. D. Hughes
Keyword(s):  
Amino Acids ◽  
Ion Exchange ◽  
Cation Exchange ◽  
Exchange Resin ◽  
Cation Exchange Resin ◽  
Ion Exchange Chromatography ◽  
Exchange Chromatography ◽  
Protein Nitrogen ◽  
Weak Cation Exchange

SUMMARYInvestigations into the non-protein nitrogen composition of grass silages using the 50 cm strong cation-exchange column of Spackman, Stein & Moore (1958) to determine the basic amino acids led to difficulties in the determination of ethanolamine in the presence of high concentrations of ammonia, and of histidine in the presence of δ amino-n-valeric acid. An alternative technique for the ion exchange chromatography and estimation of histidine, lysine, ornithine, ethanolamine, arginine and ammonia on a weak cation-exchange resin has been developed. This method enables small amounts of ethanolamine to be determined in the presence of large amounts of ammonia and values for the ethanolamine content of a number of silage samples are presented. When used in conjunction with the technique of Spackman et al. (1958) the δ-amino-n-valeric acid content of grass silages could also be determined in the presence of histidine.The estimation of amines produced by the microbial decomposition of herbage proteins during ensiling has previously involved their initial separation from the amino acids followed by quantitative partition chromatography. An alternative method for the estimation of these amines by ion-exchange chromatography on a weak cation-exchange resin is described. This method permits the colorimetric determination of β-phenylethylamine, tyramine, tryptamine, 5-hydroxytryptamine, putrescine, cadaverine and histamine without interference from the amino acids. The efficiency of this technique has been investigated using standard solutions of the naturally occurring amines and samples of good quality and of high pH spoilt silages.

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