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Biomedical subjects

K Lívanský

Publications and source records attributed to K Lívanský.

10 recordsLinked to original sources
PubMed1982

Buffering capacity of the chief components of nutritive media for algae.

The buffering capacity of solutions of KH2PO4 and NaHCO3 increases with their concentration, the behaviour being describable by mathematical expressions. Solutions of KH2PO4 prepared from tap water exhibit a buffering capacity higher by an order of magnitude than those prepared from distilled water. However, there is no difference between the buffering capacities of solutions of NaHCO3 prepared from tap and distilled water. Urea and NH4NO3 have almost no effect on the buffering capacities of solutions.

Bicarbonates↗
PubMed1982

Effect of temperature and pH on absorption of carbon dioxide by a free level of mixed solutions of some buffers.

The rate of absorption of carbon dioxide by solutions of NaHCO3, KH2PO4, hydrogencarbonate, phosphate and borate buffers at 20, 30 and 40 degrees C was determined manometrically. The absorption rate increases for all buffers tested with increasing pH. The CO2 absorption rate by KH2PO4 and by the phosphate buffer at low pH is lower than that of water. For other buffers tested it is equal to or higher than that of water, especially at higher temperatures.

Absorption↗
PubMed1981

Effect of dilution rate, pH and temperature on the growth of Chlorella kessleri in a continuous autotrophic culture.

In a culture of Chlorella kessleri illuminated with a sodium vapour lamp at 33 degrees C and pH 6.5 the maximum rate of biomass production was 4.5 g L-1 d-1. Of the total volume of 3.6 L or the suspension 2.5 L were placed between two glass concentric cylinders surrounding the tube. Examples of the course of specific growth rate mu in the transient state following jump changes in the dilution rate, pH and temperature are presented. After a jump change of pH or temperature of the suspension maximal and minimal values, respectively, of mu are observed.

Chlorella↗
PubMed1981

Removal of biogenic elements, polychlorinated diphenyls and heavy metals during the biological final treatment of waste-waters.

Algae were cultivated in the effluents from a treatment plant processing communal sewage and waste-water from a large-scale hoggery. The content of nitrogen. phosphorus and also COD and BOD were estimated in the effluent before and after cultivation of algae. It was found that the removal of nitrogen and phosphorus by Chlamydomonas geitleri from the effluent was optimal at highest at the high effluent concentrations while the purification efficiency in relation to PCD content depends on algae used.

Chlorophyta↗
PubMed1980

Optimization of costs per unit of microbial biomass produced in a batch culture.

The time course of costs per unit mass of produced biomass is calculated under the assumption that the production costs during the cultivation of microorganisms are proportional to the cultivation period. The costs are shown to attain a minimum during the cultivation. The cultivation period corresponding to this minimum is calculated in the case when the time dependence of microbial concentration in a culture can be expressed explicitly.

Bacteria↗
PubMed1979

Effect of the nonilluminated part of suspension on biomass production in an algal reactor.

The production of algal biomass in the illuminated and nonilluminated part of the suspension in an algal reactor was analyzed with regard to the biological inertia of the algae. The calculations indicate a considerable effect of nonilluminated part of the reactor on algal biomass production. The intensity of suspension stirring affects biomass production only slightly.

Adaptation, Physiological↗
PubMed1978

Fatty acids in green algae cultivated on a pilot-plant scale.

Fatty acids from Chlorella vulgaris, Scenedesmus obliquus var. acutus and from a mixed culture of the two strains, Melnik, were converted to methyl esters, separated by gas chromatography, and identified by means of standards. The spectrum of fatty acids included both saturated and unsaturated acids (with odd and even numbers of carbon atoms) from C12 to C22. Fatty acids C16:0, C18:0 and C20:3 were the major components in all cultures. Pure strains differed from the mixed culture in the production of C18:1, C12:0 and C19:2 acids; the first of these was present in higher amounts in pure cultures only, the latter two being found in the mixed culture. The level of lipids was lower as compared to the literature data and their extractability was affected by the manner of preparation of algae and extraction conditions.

Chlorella↗