Midsummer productivity of Antarctic microalgae, commonly occurring in brown sea ice along the west coast of the Palmer Peninsula, averaged more than 900 milligrams of carbon per cubic meter per hour, with an assimilation number of about 2.6. The rate of photosynthesis increased with light intensity to a maximum of about 18,000 lux, above which some inhibition was observed. The floral composition, genesis, and physiological properties of these ice communities are different from the epontic under-ice diatoms previously studied by other investigators in McMurdo Sound.

We have developed a unified aspiration efficiency model for sampling with round inlets at 0-90°forward angles from horizontal aerosol flows. The aspiration efficiency is represented by a single equation as a function of the sampling angle, the ratio of wind to inlet velocity, and different inertial parameters for 0-60°and 45-90°sampling. The equation for 45-90°s ampling is an extension of the Laktionov equation for 90°. The new model fits the experimental data within experimental accuracy.

No abstract

The marine dinoflagellate, Glenoclinium foliaceum Stein, has been shown to contain fucoxanthin, instead of peridinin, as the major xanthophyll. In addition, 2 carotenes-β-carotene and a compound with spectral properties reminiscent of isomerized y-carotene-and 2 xanthophylls-diadinoxanthin and an unidentified compound-were also isolated. These results support an earlier work that indicated the possible presence of fucoxanthin in some members of the Pyrrophyta.