1070 E. Biological Oceanography OLR (1987) 34 (12)

magnitude) to account for the activity. The nitrifica- tion observed would result in average oxygen consumption amounting to 71% of observed oxygen depletion. Winter nitrification can be an important factor in promoting oxygen depletion and possibly winter-kill of fish. Dept. of Microbiol., Macdonald Coll. of McGill Univ., 21 I l l Lakeshore Rd., Ste Anne de Bellevue, PQ H9X 1C0, Canada.

87:6997 Lee, Sanghoon and J.A. Fuhrman, 1987. Relation-

ships between binvolume and biomass of naturally derived marine bactedoplankton. Appl. environ. Microbiol., 53(6): 1298-1303.

In six cultures of filtered and diluted natural bacterioplankton assemblages with average per-cell biovolumes ranging from 0.036--0.073 /tm 3, the average per-cell C biomass was relatively constant. The biovolume-to-biomass conversion factor aver- aged about three times higher than previously estimated from Escherichia coil, and decreased with increasing volume. It is concluded that natural marine bacterial biomass and production may be higher than previously thought and variations in bacterial size may not reflect variations in biomass per cell. Fuhrman: Mar. Sci. Res. Center, SUNY, Stony Brook, NY 11794, USA.

87:6998 Martinussen, Ingrid and T.F. Thingstad, 1987.

Utilization of N, P and organic C by heterotrophic bacteria. II. Comparison of experiments and a mathematical model. Mar. Ecol.-Prog. Ser., 37(2-3):285-293.

The consumption of ammonia as N-source, ortho- phosphate as P-source, and glucose as C-source was investigated in batch and chemostat cultures of Pseudomonas putida NCMB 1960. Consumption of nutrients and growth in cell numbers were compared to a general 'Droop' type mathematical model. Important characteristics of the growth patterns in batch cultures could be explained by the model. The 3 nutrients were depleted from the cultures in various combinations dependent upon C:N:P-com- position of the medium and the observed patterns of nutrient depletion could be explained within the context of the proposed mathematical model. Three other bacterial strains of marine heterotrophic bacteria gave a similar qualitative pattern of sub- strate consumption in batch cultures, but different sets of numerical values were required in order to fit the model to each strain. The proposed model may also be fitted to published experimental results describing the consumption of glucose and phos- phate following the addition of phosphate to P- starved cultures of Vibrio natriegens. Dept. of

Microbiol. and Plant Physiol., Univ. of Bergen, Allegt. 70, N-5000 Bergen, Norway.

87:6999 Nissen, Hilde, 1987. Long term starvation of a marine

bacterium, Alteromonas denitrtlicans, Isolated from a Norwegian fjord. FEMS Microbiol. Ecol., 45(3): 173-183.

The starvation response of A. denitrificans, an organism adapted to 'feast and famine' conditions and able to survive in unsupplemented seawater for up to seven years, was studied in artificial seawater with nutrients (ammonium plus phosphate) or with an energy source (glucose or arginine). Inhibition of DNA synthesis, increase in colony forming units (cfu) and decrease in cell volume were observed upon starvation, except for cells starved in the presence of glucose, which had reduced numbers of cfu and increased cell volume, as well as lowered viability. Low uptake affinities for arginine and glucose and a gradual adaptation process were observed. Dept. of Microbiol. and Plant Physiol., Univ. of Bergen, AUegt. 70, N-5007 Bergen, Norway. (gsb)

87:7000 Oren, Aharon, 1987. On the use of tetrazolinm salts

for the measurement of microbial activity in soUments. FEMS Microbiol. Ecol., 45(3):127- 133.

Examination of the effects of tetrazolium salt addition on various metabolic groups of anaerobic bacteria showed that tetrazolium salt reduction reflects hydrogen-generating fermentation as well as electron transport activity and that some bacteria do not reduce the salt to a significant extent. Also, the addition inhibited H 2 evolution, which in turn would affect the metabolism of other bacteria such as sulfate reducers. Div. of Microbial and Molecular Ecol., Inst. of Life Sci., Hebrew Univ. of Jerusalem, 91904 Jerusalem, Israel. (gsb)

87:7001 Powell, J.C., P.E. Dabinett and J.A. Gow, 1987. An

annual cycle of almndnaee and activity of het- erotrophic bacteria and al~mdnaee of hydro- carbonodasti¢ Imcterla in Newfouldland coastal water. Can. J. MierobioL, 33(5):377-382. Gow: Dept. of Biol., Memorial Univ., St. John's, NF, A1B 3X9, Canada.

87:7002 Roser, D.J., H.J. Bavor and S.A. McKersie, 1987.

Application of most-pmbalb41e-number statistic to