Differential Sensitivity of Two Green Algae, Scenedesmus obliqnus and Chlorella pyrenoidosa, to 12 Pesticides

2002 ◽  
Vol 52 (1) ◽  
pp. 57-61 ◽  
Author(s):  
Jianyi Ma ◽  
Rongquan Zheng ◽  
Ligen Xu ◽  
Shufeng Wang
Keyword(s):  
Green Algae ◽  
Chlorella Pyrenoidosa ◽  
Differential Sensitivity

scholarly journals Biosynthesis of phytoquinones. Homogentisic acid: a precursor of plastoquinones, tocopherols and α-tocopherolquinone in higher plants, green algae and blue–green algae

1970 ◽  
Vol 117 (3) ◽  
pp. 593-600 ◽  
Author(s):  
G. R. Whistance ◽  
D. R. Threlfall
Keyword(s):  
Green Algae ◽  
Phenylacetic Acid ◽  
Higher Plants ◽  
Chlorella Pyrenoidosa ◽  
Homogentisic Acid ◽  
Side Chain ◽  
Methyl Groups ◽  
Blue Green Algae ◽  
Hydroxyphenylacetic Acid ◽  
Tracer Experiments

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.

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

2014 ◽  
Vol 54 (1) ◽  
pp. 65-76 ◽  
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.

scholarly journals Influence of Speciation of Thorium on Toxic Effects to Green Algae Chlorella pyrenoidosa

2017 ◽  
Vol 18 (4) ◽  
pp. 795 ◽  
Author(s):  
Can Peng ◽  
Yuhui Ma ◽  
Yayun Ding ◽  
Xiao He ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Green Algae ◽  
Chlorella Pyrenoidosa ◽  
Toxic Effects

scholarly journals Ultrasonic selectivity on depressing photosynthesis of cyanobacteria and green algae probed by chlorophyll-a fluorescence transient

2017 ◽  
Vol 76 (8) ◽  
pp. 2085-2094 ◽  
Author(s):  
Zhipeng Duan ◽  
Xiao Tan ◽  
Niegui Li
Keyword(s):  
Chlorophyll A ◽  
Green Algae ◽  
Electron Acceptor ◽  
Cell Concentration ◽  
Electron Flow ◽  
Chlorella Pyrenoidosa ◽  
Cyanobacterial Blooms ◽  
Cell Structures ◽  
Toxic Cyanobacteria ◽  
New Strategy

Ultrasound can inhibit cyanobacterial growth through rupturing cells, but this pathway frequently has the risk to release intercellular toxin (e.g., microcystin). Depressing photosynthesis without cell disruption may provide a new strategy to control cyanobacterial blooms using ultrasound, especially Microcystis blooms. In this work, Microcystis aeruginosa (toxic cyanobacteria) and Chlorella pyrenoidosa (typical green algae) were chosen as model microalgae to verify this hypothesis. Results showed that ultrasound has the ability to inhibit cyanobacterial photosynthesis significantly and selectively. Specifically, sonication damaged QA, a tightly bound one-electron acceptor, and blocked electron flow at QB, a two-electron acceptor, in the photosystem II (PSII) of M. aeruginosa when it was exposed for 60 s (35 kHz, 0.043 W/cm3). Moreover, 44.8% of the reaction centers (RCs) in the PSII of M. aeruginosa were transferred into inactive ones (RCsis), and the cell concentration decreased by 32.5% after sonication for 300 s. By contrast, only 7.9% of RCsi occurred in C. pyrenoidosa, and cell concentration and chlorophyll-a content reduced by 18.7% and 9.3%, respectively. Differences in both species (i.e., cell structures) might be responsible for the varying levels to sonication. This research suggests that cyanobacteria, especially Microcystis, could be controlled by ultrasound via damaging their PSIIs.

The effects of three sulfonylurea herbicides and their degradation products on the green algae Chlorella pyrenoidosa

Chemosphere ◽  
1998 ◽  
Vol 37 (4) ◽  
pp. 747-751 ◽  
Author(s):  
Liping Wei ◽  
Hongxia Yu ◽  
Yue Sun ◽  
Jianfang Fen ◽  
Liansheng Wang
Keyword(s):  
Green Algae ◽  
Degradation Products ◽  
Chlorella Pyrenoidosa ◽  
Sulfonylurea Herbicides
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