%0 Journal Article %A Cobet, A. B. %A Wirsen, C. %A Jones, G. E. %T The Effect of Nickel on a Marine Bacterium, Arthrobacter marinus sp.nov. %D 1970 %J Microbiology, %V 62 %N 2 %P 159-169 %@ 1465-2080 %R https://doi.org/10.1099/00221287-62-2-159 %I Microbiology Society, %X SUMMARY: An unbalanced growth situation, resulting in large, plasmolysed sphero-plasts (megalomorphs) produced by the addition of nickel to the growth medium of a marine bacterium, Arthrobacter marinus sp.nov., is described.The effect of increasing nickel concentrations was gradual. Under the cultural conditions used, a slight effect was noted on size in 1 × 10−4 m-NiCl2, but in 4 × 10−4 m-NiCl2 the cells formed megalomorphs attaining a size of 10 to 15 μm. Cell division did not occur in 5 × 10−4 m-nickel. The lag phase of the culture increased from about 3 h. without added nickel to more than 70 h. at 4 × 10−4 m-nickel. Concurrently, the maximum population decreased as the nickel concentration was increased. The classification of the marine bacterium is described and the organism is designated as A. marinus sp.nov. %U https://www.microbiologyresearch.org/content/journal/micro/10.1099/00221287-62-2-159