Seasonal Changes in Osmotic Pressure of Flounder Sera

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Science  21 Jul 1961:
Vol. 134, Issue 3473, pp. 193-194
DOI: 10.1126/science.134.3473.193


The freezing point depression of sera collected from flounder during the winter averaged 1.15°C, whereas it averaged 0.63°C for sera collected during the summer. Elevated concentration of sodium and chloride ions were found for the winter samples of sera, but NaCl explained only a fraction of the seasonal increase in osmolarity.