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1

Plankton photosynthesis, extracellular relase and bacterial utilization of relased dissolved organic carbon (RDOC) in lakes of different trophy

100%
Chrost R. J.
Acta Microbiologica Polonica
|
1983
|
tom 32
|
nr 3
2

Some thoughts about the role of bacteria in phytoplankton succession in lakes?

100%
Chrost R. J.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
1991
|
tom 46
3

The estimation of extracellular release by phytoplankton and heterotrophic activity of aquatic bacteria

100%
Chrost R. J.
Acta Microbiologica Polonica
|
1978
|
tom 27
|
nr 2
4

Extracellular release in Chlorella vulgaris culture and the role of bacteria accompanying - algae in this process

100%
Chrost R. J.
Acta Microbiologica Polonica
|
1978
|
tom 27
|
nr 1
5

Can bacteria affect the phytoplankton succession in lacustrine environments?

100%
Chrost R. J.
Seria Biologiczna. Uniwersytet im. Adama Mickiewicza w Poznaniu
|
1990
|
tom 43
6

Phosphorus and microplankton development in an europhic lake

100%
Chrost R. J.
Acta Microbiologica Polonica
|
1988
|
tom 37
|
nr 2
7

Application of the isotope dilution principle to the determination of [14C]glucose incorporation by aquatic bacteria

63%
Chrost R. J., Overbeck J.
Acta Microbiologica Polonica
|
1989
|
tom 38
|
nr 1
8

Some factors affecting the heterotrophic activity of becateria in lake

63%
Chrost R. J., Siuda W.
Acta Microbiologica Polonica
|
1978
|
tom 27
|
nr 2
9

Primary production and extracellular release by phytoplankton in some lakes of the Masurian Lake District, Poland

63%
Chrost R. J., Wazyk M.
Acta Microbiologica Polonica
|
1978
|
tom 27
|
nr 1
10

Konsumpcja bakterii przez pierwotniaki w ekosystemach wodnych

63%
Koton-Czarnecka M., Chrost R. J.
Postępy Mikrobiologii
|
2001
|
tom 40
|
nr 2
219-240
11

Molecular weight fractionation of dissolved organic matter (DOM) released by phytoplankton

63%
Chrost R. J., Faust M. A.
Acta Microbiologica Polonica
|
1980
|
tom 29
|
nr 2
12

Microbial enzymatic decomposition of beta-linked glycosidic biopolimers in four lakes of the Mazurian Lake District, Poland

63%
Gajewski A. J., Chrost R. J.
Polskie Archiwum Hydrobiologii
|
1994
|
tom 41
|
nr 4
405-414
13

Extracellular relase of organic products and growth of bacteria in Anabaena cylindrica (Blue-green alga) culture

63%
Chrost R. J., Brzeska D.
Acta Microbiologica Polonica
|
1978
|
tom 27
|
nr 3
14

The relationship between alkaline phosphatase (APA) activity and phosphate availability for phytoplankton and bacteria in eutrophic lakes

63%
Siuda W., Chrost R. J.
Acta Microbiologica Polonica
|
1987
|
tom 36
|
nr 3
15

Wplyw jonow kadmu [Cd2plus] i olowiu [Pb2plus] na mikrobiologiczna degradacje biopolimerow organicznych w jeziorze eutroficznym

63%
Gajewski A. J., Chrost R. J.
Biotechnologia
|
1994
|
nr 3
71-81
16

Microbial enzyme activities and phytoplankton and bacterial production in the pelagial of the Great Mazurian Lakes [North-Eastern Poland] during summer stratification

63%
Gajewski A. J., Chrost R. J.
Ekologia Polska
|
1995
|
tom 43
|
nr 3-4
245-265
17

Selected enzymatic properties of bacterioplankton in lakes of various degrees of eutrophication

63%
Wcislo R., Chrost R. J.
Acta Microbiologica Polonica
|
1997
|
tom 46
|
nr 2
18

Decomposition and utilization of particulate organic matter by bacteria in lakes of different trophic status

63%
Siuda W., Chrost R. J.
Polish Journal of Environmental Studies
|
2002
|
tom 11
|
nr 1
Enzymatic decomposition and bacterial utilization of various types of particulate and dissolved substrates was studied during spring-summer period in four lakes of Mazurian Lake District (Northern Poland). We found that seston particles, similarly as dissolved organic matter (DOM), undergo intensive decomposition processes in lake water, but only after their previous colonization by bacteria. In lakes of low or moderate trophic status free-living microorganisms predominated. They preferentially utilized low molecular weight, dissolved organic compounds. Increases in particulate organic matter (POM) content in these environments caused rapid change of substrate exploitation strategy and adaptation of these bacteria to live in particle-attached forms. In lakes of POM and colloidal DOM (CDOM) abundant particle-attached microheterotrophs, although less metabolically active than free-living bacteria, were mainly responsible for secondary production and POM mineralization A mechanisms that permit effective POM exploitation by seston-attached bacteria was overproduction of relatively low active (high Km) enzymes (e.g. aminopeptidase) and/or synthesis of the enzymes (e.g. β-glucosidase or glucosaminidase) that were optimally adapted (low Km) to the environment.
19

Measurement of protozoan grazing on bacteria by means of [3H-thymidine]-labeled natural assemblages of lake bacteria

63%
Koton-Czarnecka M., Chrost R. J.
Polish Journal of Environmental Studies
|
2002
|
tom 11
|
nr 4
Protozoan grazing on bacteria transfers significant amounts of organic carbon to higher trophic levels in aquatic ecosystems. Therefore, the determination of protozoan grazing rates on bacteria is necessary for estimating the efficiency of microbial loops in organic matter utilization and transformation. Currently, a variety of methods are available to measure protozoan grazing on bacteria but most of them result in serious physical perturbations of the examined samples. We describe an assay for protozoan grazing on bacteria by means of [3H-methyl]thymidine-labelled natural bacterial assemblages as a food tracer for protozoans. Using this method we determined the protozoan grazing rates on bacteria in ten Mazurian lakes in April and July, 2000. We compared the grazing rates with bacterial biomass production and the trophic state index of studied lakes.
20

Survival of Escherichia coli in freshwater

63%
Wcislo R., Chrost R. J.
Polish Journal of Environmental Studies
|
2000
|
tom 09
|
nr 3
Experiments on the survival of Escherichia coli were conducted in the water of man-made Zegrzynski Reservoir. The aim of this study was to evaluate how selected biocenotic factors (predation, coliphage infection, presence of autochthonic microflora and nutrient conditions) affect this process. We observed residual living cells of E. coli up to about thirty days of the investigation. We found that the major factor that was responsible for mortality of E. coli was microflagellate grazing and exposure to an aquatic environment. Size-selective preferences of microflagellates toward E. coli cells were observed. No visible effect of bacteriophages on the survival of E. coli was detected. Better nutritional condition and the presence of native heterotrophic microflora significantly prolonged the survival time of E. coli in the studied environment.
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