Marine Organic Chemistry: Evolution, Composition, by E.K. Duursma, R. Dawson

By E.K. Duursma, R. Dawson

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By E.K. Duursma, R. Dawson

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When in spring stratification develops, a plankton bloom occurs, exhausting the nutrients in the euphotic zone within a few weeks; this is followed by a period with a much lower primary productivity. When in autumn new mixing periods alternate with stable periods, a smaller secondary bloom OCCUTS. In winter there is low primary production due to a much lower level of insolation. In polar regions, at high latitudes, the Arctic Ocean has a very low production (less than 10 g C m-' yr-l) since this region is covered with pack-ice nearly the whole year.

Origins Life, 5: 57-67. L. , 1968. Ammonium ion concentration in the primitive ocean. Science, 159: 423-425. , 1954. Photosynthesis of amino acids from paraformaldehyde and potassium nitrite. Nature, 173: 1141. , Ranganayaki, S. , 1958. Photosynthesis of amino acids from paraformaldehyde involving the fixation of nitrogen in the presence of colloidal molybdenum oxide as catalyst. Nature, 182: 1668. , 1951. The Physical Basis of Life. Routledge and Kegan Paul, London, 8 0 pp. , 1959. On the mechanism of the Formose reaction.

Diurnal temperature cycling, such as has been postulated for the synthesis of nucleotides could therefore result in the synthesis of oligonucleotides by evaporation and heating during the day, while at night rehydration would take place, leading t o partial hydrolysis. If the night-time temperature was low enough to favor helix formation, a preferential hydrolysis of the 2’-5’ linkages would result. Preferential hydrolysis would, in any case, favor the 3’--5‘ linkage above the 2‘-5’, whether or not a helix was formed.

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