The Content of Pigments and Photosynthetic Activity of Chlorella vulgaris Beij. (Chlorophyta) When Exposed to Sodium Selenite, Zinc Sulphate, and Chromium Chloride

2019 ◽  
Vol 21 (4) ◽  
pp. 335-348
Author(s):  
O. I. Bodnar ◽  
A. I. Herts ◽  
N. V. Herts ◽  
V. V. Grubinko
Keyword(s):  
Chlorella Vulgaris ◽  
Sodium Selenite ◽  
Zinc Sulphate ◽  
Photosynthetic Activity ◽  
Chromium Chloride

Photosynthetic activity of spring wheat depending on the conditions of water supply

2020 ◽  
Author(s):  
I.I. Seregina ◽  
◽  
I.G. Makarskaya
Keyword(s):  
Water Supply ◽  
Spring Wheat ◽  
Sodium Selenite ◽  
Photosynthetic Activity ◽  
Wheat Variety ◽  
Sharp Decrease ◽  
Soil Culture ◽  
Growing Conditions ◽  
Spring Wheat Variety ◽  
Excessive Water

Abstract:In model experiments in soil culture, the effect of different methods of treatment with sodium selenite on the photosynthetic activity of spring wheat variety Zlata was studied under extreme growing conditions. Under drought conditions, the inhibition of the growth of the photosynthetic surface of spring wheat plants was revealed. Under conditions of excessive water supply, a sharp decrease in the area of the assimilating surface of wheat plants was observed. The positive effect of sodium selenite solution on the photosynthetic activity of spring wheat plants was established with insufficient and excessive water supply to wheat plants.

TOXICITY ASSESSMENT OF ENGINEERED NANOPARTICLES USING ALGAE CHLORELLA VULGARIS

2017 ◽  
pp. 50-54
Author(s):  
A. A. Asanova ◽  
V. I. Polonskiy ◽  
Y. S. Grigoriev
Keyword(s):  
Chlorella Vulgaris ◽  
Photosynthetic Activity ◽  
Photosynthetic Apparatus ◽  
Test Organism ◽  
Toxicity Assessment ◽  
Delayed Fluorescence ◽  
Engineered Nanoparticles ◽  
Environmental Objects ◽  
Test Culture ◽  
Potential Risks

The use of nanoparticles covers new spheres of production every year. Their release into the environment is possible at any stage of their lifespan: from the manufacturing process to the utilization in the final product; therefore potential risks they pose for various environmental objects should be evaluated. The purpose of this work was to assess the effect of technogenic nanoparticles on Chlorella vulgaris growth and photosynthetic activity. Toxic properties of three types of nanoparticles TiO2 with a size of 100 to 190 nm, SiO2 with dimensions of 10-15 nm and 100-120 nm have been studied. Chlorella vulgaris Beijer alga was used as test organism. The evaluation of nanoparticles toxicity was based on changes in the relative delayed fluorescence index (RDFI), which characterizes the photosynthetic activity of microalgae. The effect on the growth of the test culture was determined from the optical density (OD) of the algal suspension. It was found that the TiO2 nanoparticles slightly reduced the growth and activity of the cell photosynthetic apparatus. Large particles of SiO2 proved to be more toxic than smaller ones. For nanoparticles of 100-120 nm size , the EC50 value according to the OD index was 8 mg/dm3, while the particles measuring 10-15 nm did not show a significant effect on the growth of the culture. Large SiO2 particles also appeared more toxic than small particles, judging by RDFI parameter.

The Heterotrophic Connection in a Photoautotrophic Chlorella Vulgaris Dominant in Wastewater Oxidation Ponds

1993 ◽  
Vol 27 (7-8) ◽  
pp. 151-155 ◽  
Author(s):  
Iris Cohen ◽  
Anton F. Post
Keyword(s):  
Chlorella Vulgaris ◽  
Photosynthetic Activity ◽  
Algal Growth ◽  
Oxygen Demand ◽  
Utilization Efficiency ◽  
Direct Result ◽  
Cellular Division ◽  
Pigment Contents ◽  
Photosynthetic Potential ◽  
Oxidation Ponds

Chlorella vulgaris strain C1 was grown in laboratory under autotrophic and mixotrophic conditions. Cellular division rates increased in cultures supplied with either acetate or glucose. As a direct result respiratory activity was enhanced in those cells, most pronounced in the presence of acetate. Glucose and acetate had opposed effects on the photosynthetic activity of the cells. Cells grown in the presence of acetate had a 3-fold decrease in pigment contents. Since this was mostly expressed in decreased light utilization efficiency of the cells, we conclude that fewer light harvesting antennae were synthesised. Cells grown with glucose retain high pigment contents and photosynthetic activity of the cells was strongly enhanced. It was observed that even though organic matter may support algal growth in oxidation ponds, at the same time one may expect a much stronger oxygen demand accompanied by a reduced photosynthetic potential. This must be considered a burden on the wastewater treatment operation requiring countermeasures to be taken.

scholarly journals Regulation of biosynthesis of lipids in Chlorella vulgaris by compounds of zinc, chromium and selenium

2018 ◽  
Vol 9 (2) ◽  
pp. 267-274
Author(s):  
O. I. Bodnar ◽  
H. B. Kovalska ◽  
V. V. Grubinko
Keyword(s):  
Fatty Acids ◽  
Chlorella Vulgaris ◽  
Sodium Selenite ◽  
Total Content ◽  
Biologically Active ◽  
Control Group ◽  
General Tendency ◽  
Zinc Ions ◽  
Regulation Of Biosynthesis ◽  
Trace Elemental

We studied molecular and metabolic mechanisms of regulated lipid biosynthesis in Chlorella vulgaris aquaculture. after addition of sodium selenite (10 mg/dm3) when added separately and in combination with Zn2+ (5 mg/dm3) and Cr3+ (5 mg/dm3) during 7 days of their action in order to obtain biotechnologically useful lipid products, enriched with microelements. Experiments were carried out in accordance with generally accepted hydrological and biochemical methods. It was established that micronutrients that were added into the medium result in an increase in the total content of lipids in the range of 10%. The redeployment of lipid classes in chlorella cells occurs due to the action of sodium selenite in favour of phospholipids by reducing the proportion of diacylglycerols, while the amount of triacylglycerols and nonetherified fatty acids does not change. Combined action of sodium selenite and zinc ions leads to the significant increase of the relative content of diacylglycerols, and partial increase of nonetherified fatty acids, at the same time in the cells we can observe a slight decrease in the proportion of triacylglycerols and phospholipids. Inclusion of 14C-bicarbonate in carbohydrates, proteins and lipids of Ch. vulgaris is significantly different both from the control group and from the group to which we added the investigated factors. However, the predominance of inclusion in lipids is 2–3 times higher than its inclusion into carbohydrates and 9–12 times higher in proteins. The increase of labeled bicarbonate inclusion intensity into carbohydrates occurs only in the case of joint action of sodium selenite and zinc ions, in proteins and lipids – in all cases of trace elemental activity. It was revealed that the general tendency is the reduction of the inclusion of bicarbonate in Ch. vulgaris triacylglycerols and its increase in phospholipids and nonetherified fatty acids, except for chromium ions, that modified the inclusion of the label into diacylglycerols, which may be due to the specific toxicity of the metal ions. The activation of lipogenesis after addition of selenium, zinc and chromium compounds was confirmed by an increase in the inclusion intensity of 14C-oleate in various classes of lipids that are present in chlorella and increased activity of glycerol-3-phosphatacyltransferase. Direction and regulation of lipid metabolism in Ch. vulgaris in the direction of increasing the amount and accumulation of lipids and their separate classes using sodium selenite in combination with Zn2+ and Cr3+ with the purpose of forming selenium-metal-lipid complexes can be used to obtain biologically active lipidous preparations enriched with essential microelements.

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