Toxic response of the freshwater green algae Chlorella pyrenoidosa to combined effect of flotation reagent butyl xanthate and nickel

1. By means of 14C tracer experiments and isotope competition experiments the roles of d-tyrosine, p-hydroxyphenylpyruvic acid, p-hydroxyphenylacetic acid, phenylacetic acid, homogentisic acid and homoarbutin (2-methylquinol 4-β-d-glucoside) in the biosynthesis of plastoquinones, tocopherols and α-tocopherolquinone by maize shoots was investigated. It was established that d-tyrosine, p-hydroxyphenylpyruvic acid and homogentisic acid can all be utilized for this purpose, whereas p-hydroxyphenylacetic acid, phenylacetic acid and homoarbutin cannot. Studies on the mode of incorporation of d-tyrosine, p-hydroxyphenylpyruvic acid and homogentisic acid showed that their nuclear carbon atoms and the side-chain carbon atom adjacent to the nucleus give rise (as a C6-C1 unit) to the p-benzoquinone rings and nuclear methyl groups (one in each case) of plastoquinone-9 and α-tocopherolquinone and the aromatic nuclei and nuclear methyl groups (one in each case) of γ-tocopherol and α-tocopherol. 2. By using [14C]-homogentisic acid it has been shown that homogentisic acid is also a precursor of plastoquinone, tocopherols and α-tocopherolquinone in the higher plants Lactuca sativa and Rumex sanguineus, the green algae Chlorella pyrenoidosa and Euglena gracilis and the blue–green alga Anacystis nidulans.

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Genetic diversity analysis with ISSR PCR on green algae Chlorella vulgaris and Chlorella pyrenoidosa

Chinese Journal of Oceanology and Limnology ◽

10.1007/s00343-008-0380-1 ◽

2008 ◽

Vol 26 (4) ◽

pp. 380-384 ◽

Cited By ~ 9

Author(s):

Songdong Shen

Keyword(s):

Genetic Diversity ◽

Green Algae ◽

Chlorella Vulgaris ◽

Chlorella Pyrenoidosa ◽

Diversity Analysis ◽

Genetic Diversity Analysis ◽

Issr Pcr

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Increase in the biomass of some green algae species in nitrate and ammonium mediums depending on auto-, mixo- or heterotrophic conditions

Acta Societatis Botanicorum Poloniae ◽

10.5586/asbp.1985.006 ◽

2014 ◽

Vol 54 (1) ◽

pp. 65-76 ◽

Cited By ~ 1

Author(s):

Stefan Gumiński ◽

Krystyna Jurajda ◽

Ewa Tatkowska

Keyword(s):

Protein Content ◽

Green Algae ◽

Chlorella Pyrenoidosa ◽

Dry Mass ◽

Scenedesmus Quadricauda ◽

Individual Species ◽

Content Increase ◽

Nitrate Medium ◽

The Individual ◽

Mixotrophic Conditions

The increase in total dry mass and protein in cultures of <em>Chlorella pyrenoidosa, Scenedesmus quadricauda</em> and <em>Ankistrodesmus acicularis</em> was studied. Under autotrophic conditions, increases in dry mass were, as a rule, larger in the nitrate medium than in the ammonium one, under mixotrophic conditions the situation was reversed and in the case of heterotrophy, the individual species reacted differently. The dependence ot the protein content increase on the nitrate or ammonium form of the medium was not clear. Changes in time of the pH and rH of the mediums were followed and the interdependence of these changes with the production of biomass is discussed.

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On the possibility of flotation processing of technogenic gold-containing waste from enrichment plants

10.31643/2021.06 ◽

2021 ◽

Author(s):

L.V. Semushkina ◽

◽

S.M. Narbekova ◽

Keyword(s):

Chemical Analysis ◽

Main Part ◽

Gold Recovery ◽

Butyl Xanthate ◽

Flotation Reagent ◽

Rational Analysis ◽

Gold Extraction ◽

Foaming Agent ◽

Flotation Tailings ◽

Fine Grained

The aim of the work is the flotation processing of gold-containing tailings using composite flotation (CF) agents. According to the results of chemical analysis, the studied tailings sample contains 0.39 g/t gold. The main part of the initial tailings sample is represented by rock-forming minerals such as quartz, clinochlore, microcline, tremolite, albite, calcite, and muscovite. According to the results of the rational analysis, 39.50% of gold is in the hard-to-recover form with quartz; 28.87% is in the form of fine-grained gold; 31.63% is in intergrowths with sulfides and rocks. The optimum reagent scheme of flotation processing of tailings was chosen: degree of regrinding of 95% of grade -0,074 mm, consumption of sodium butyl xanthate of 100 g/t, consumption of foaming agent T-92 of 30 g/t. Under the chosen reagent scheme the gold-containing concentrate containing 6,4 g/t gold at the recovery of 49,68% was obtained. Preliminary regrinding of tailings allows to increase the gold recovery in the blanks concentrates by 27.96%. The reagent scheme of flotation of gold-containing tailings with the application of composite flotation (CF) agent was tested. A composition of sodium butyl xanthate and reaeflot was used as a composite flotation reagent for the improvement of gold extraction from flotation tailings. Application of composite flotation (CF) agent pre-treated on the dispersant increases gold recovery into gold-containing concentrate by 4.65%, in comparison with the basic collector sodium butyl xanthogenate. Consumption of flotation agent CF is reduced by 20%.

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