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A blue-pigmented hasleoid diatom, Haslea sp., from the Adriatic Sea

Palińska K. A., Surosz W.

Oceanological and Hydrobiological Studies

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2018

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Vol. 47, No. 1

60--66

EN

We present the first report and description of the pinnate diatom Haslea sp. from the northeastern Adriatic Sea, Croatia, producing a blue pigment. This organism is very similar to the well-known Haslea ostrearia, the first described “blue” diatom producing marennine, i.e. the pigment involved in the greening of oysters, and recently described H. provincialis. However, the Croatian diatom slightly differs from other Haslea species in its morphology and 18S rRNA sequence. The discovery of Haslea sp. from Croatia confirmed the possible existence of more species among the representatives of blue Haslea species, as previously assumed. The discovery of several genetically distinct populations of Haslea ostrearia, new species H. karadagensis, H. provincialis and Haslea sp. from Croatia, suggests that species richness in the group of “blue” diatoms is probably underestimated and still more new blue diatoms remain undiscovered. This also raises questions about previously published reports and observations of Haslea distribution in the Mediterranean Sea whether these organisms really belong to H. ostrearia.

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Production of transparent exopolymer particles (TEP) in the nitrogen fixing cyanobacterium Anabaena flos-aquae OL-K10

Surosz W., Palińska K.A., Rutkowska A.

Oceanologia

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2006

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No. 48 (3)

385-394

EN

The aim of the study was to measure the transparent exopolymer particles (TEP) concentration in cultures of Anabaena flos-aquae OL-K10 and to determine the relationship between the quantity of particles produced and the light intensity, the age of the culture and the presence of nitrogen in the culture medium. This is the first time TEP production has been investigated in the Nostocales, an order of nitrogen-fixing phytoplankton species. The results showed that TEP production depends on the presence of nitrogen in the culture medium. The longer the culture is grown, the higher the correlation between its TEP content and its chlorophyll a concentration.

3

Halotolerance phenomena in Synechocystis sp. from the North Sea

Mishra S., Krumbein W. E., Palińska K.A.

Oceanological Studies

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2001

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Vol. 30, No. 1-2

3-12

EN

Microorganisms modify their biochemical composition in response to environmental factors, including nutrient availability, light, temperature and salinity. This research was carried out in order to establish ways of modifying the biochemical composition of marine cyanobacteria through the optimization of environmental parameters e.g. light, temperature and salinity. The effect of salinity stress in combination with variable temperature and light intensity was studied on Synechocystis sp., strain Ol 86, isolated from the North Sea. In nature, all microorganisms are exposed to different factors. Hence, we considered all the essential factors together in different groupings. Experiments were conducted at three different temperatures, two different light intensities and four different salinities. The influence of these factors on the growth and physiology of cyanobacteria from a microbial mat of the North Sea is reported.

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Axenic cultures of cyanobacteria - obtaining methods and associated problems

Palińska K.A., Krumbein W. E.

Oceanological Studies

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1998

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Vol. 27, No. 1

69-78

EN

As a part of the study on the composition and development of microbial mats, it was attempted to develop new more effec-tive methods for the isolation and purification of cyanobacteria. The difficulty often encountered in the isolation and obtaining of axenic cultures is commonly known and well reflected by the great variety of purification methods used. Although numerous techniques have been described, most of them either failed or were not suitable for certain types of cultures. Differential gel electrophoresis and Percoll gradient centrifugation, applied by us, appear to be more effective than some other methods in reducing the number of heterotrophic bacterial 'contaminants' present in freshly isolated cultures of cyanobacteria from marine environment.