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Chemostats were used to construct nutrient (vitamin B 12 ) and energy budgets for the flagellate Monochrysis {Pavlova lutheri (Droop) Green) under varying conditions of nutrient and light limitation and luxury, the aim being to describe light limitation and luxury in terms analogous to those of the Cell Quota nutrient model. Measurements were made of steady-state dilution rate, biomass, cell quota, cell chlorophyll a, cell energy content, dark respiration and photosynthetic efficiency, under low irradiance (

The X-ray crystal structure analysis of the 1 : ' 1 title complex is reported. Crystals are monoclinic, space group P2,lc, with a = 6.172(5), b = 9.605(8), c = 20.33(2) A, p = 96.60(8)", and Z = 4. The structure has been solved from visually estimated data by the heavy-atom method, and refined by least-squares to R 10.2% for 1 865 non-zero observed reflections. Each silver atom is co-ordinated to three sulphadiazine molecules by a distorted tetrahedral configuration of three nitrogen atoms and one oxygen atom, with Ag-N 2.24, 2.24, and 2.44. and Ag-0 2.52 8. The molecules are also linked by sheets of NH 0 s hydrogen bonds as in related sulphonamide structures.fections in extensive burns' Compounds formed be-1 M.

Small pennate diatom 255 Prasinophyceae Platymonas chui (Butch.) 227 Parke P. subcordiformis (Wille) Hazen 228 P. subcordiformis (Wille) Hazen 229 P. tetrathele G. S. West 9 P. tetrathele G. S. West 230 P. tetrathele G. S. West 231 Tetraselmis carteriiformis 10

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