EFFECT OF SALT CONCENTRATION ON THE SYNTHESIS OF SULFATED MACROMOLECULES IN THE BRINE SHRIMP (ARTEMIA-FRANCISCANA) - CHANGES OF SULFATION RATE DURING DEVELOPMENT
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Date
1993
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Abstract
1. The effect of sodium chloride and sulphate concentrations on the rate of sulphation was evaluated in four developmental stages of the brine shrimp Artemia franciscana, a crustacean inhabiting extreme hypersaline environments.
2. An increase of 4-5-fold in the sulphation rate of macromolecules was observed at 0.6-0.8 M NaCl compared to 0.4 or 1.0 M NaCl.
3. Increase of sulphate concentration in the artificial sea water produced an increment in total sulphation of at least 30-fold.
4. The rate of sulphation decreased during development of the brine shrimp. It is higher at early nauplii stage compared with pre- or adult organisms.
5. Several sulphated macromolecules were observed after fractionation of sulphated material obtained from organisms under different stages of development. The predominant form correspond to a proteoglycan (PG) of 270-400 kDa.
2. An increase of 4-5-fold in the sulphation rate of macromolecules was observed at 0.6-0.8 M NaCl compared to 0.4 or 1.0 M NaCl.
3. Increase of sulphate concentration in the artificial sea water produced an increment in total sulphation of at least 30-fold.
4. The rate of sulphation decreased during development of the brine shrimp. It is higher at early nauplii stage compared with pre- or adult organisms.
5. Several sulphated macromolecules were observed after fractionation of sulphated material obtained from organisms under different stages of development. The predominant form correspond to a proteoglycan (PG) of 270-400 kDa.