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| Le Gland, Guillaume; Aumont, Olivier; Memery, Laurent. |
| Thorium-234 (Th-234), an insoluble radioisotope scavenged by marine particles, can be used as a proxy of the biological carbon pump. Thorium-234 observations can constrain biogeochemical models, but a necessary first step is to estimate the poorly known partition coefficients between particulate and dissolved phases. In this study, the Th-234 partition coefficients for five particle types, differing in size and chemical composition, are estimated by fitting a global 3-D Th-234 model based on the coupled ocean general circulation-biogeochemistry model NEMO-PISCES (at a resolution of 2 degrees) to a global Th-234 data set (including GEOTRACES data). Surface partition coefficients are estimated between 0.79 and 16.7x10(6). Biogenic silica has the smallest... |
| Tipo: Text |
Palavras-chave: Thorium 234; Inverse modeling; Partition coefficient; Biological carbon pump. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00605/71666/70108.pdf |
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| Silva,Daniel Pereira da; Pontes,Marcela Zanella Ribeiro; Souza,Maria Aparecida de; Vitolo,Michele; Silva,João Batista de Almeida e; Pessoa-Junior,Adalberto. |
| Glucose-6-phosphate dehydrogenase (G6PDH) and hexokinase (HK) are important enzymes used in biochemical and medical studies and in several analytical methods. Aqueous two-phase system (ATPS) formed by a polymer solution and an electrolyte solution provides a method for the separation and purification of enzymes with several advantages, including biocompatibility and easy scale up of the process. In this work, the effects of different pH values on the storage stability and partitioning behavior (K, partition coefficient) of the enzymes G6PDH and HK from baker's yeast extract were investigated in ATPS. The results, obtained from the 17.5% PEG 400 : 15.0% phosphate system, showed that when the pH was increased from 5.0 to 8.8, the K HK increased 26-fold and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Aqueous two-phase systems; Partition coefficient; Protein purification; Hexokinase; Glucose 6-phosphate dehydrogenase. |
| Ano: 2002 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822002000300002 |
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