Effects of heavy metals ions on primary photosynthetic processes in Antarctic filamentous alga Zygnema sp. ( Short Communication )

2016 ◽  
Vol 6 (2) ◽  
pp. 180-185 ◽  
Author(s):  
Higinio Pablo Varela Hernandez
Keyword(s):  
Heavy Metals ◽  
Short Communication ◽  
Filamentous Alga ◽  
Similar Extent ◽  
Ps Ii ◽  
Chlorophyll Fluorescence Parameters ◽  
Zn Addition ◽  
James Ross Island ◽  
Heavy Metals Ions ◽  
Two Parameters

Algae show different extent of resistance to heavy metals. In this study, the resistance of green filamentous alga Zygnema sp. (strain EEL201, originally collected at James Ross Island, Antarctica) was tested by chlorophyll fluorescence parameters. The alga was taken from the stock culture cultivated on agar, innoculated to liquid medium and allowed to develop biomass large enough for exposition experiments. Heavy metal treatments consisted of addition of Cd and Zn so that effective concentration was 66 mM. Response of primary photosynthetic processes to Cd, Zn addition was assessed by the exposition time-dependent decrease in potential quantum yield (FV/FM) photosystem II (PS II) and relative fluorescence decline ratio (RFd). Cd- and Zn-treated Zygnema sp. exhibited similar extent of decline of the two parameters associated with inhibition of primary processes of photosynthesis. Negative changes to PS II, however, did not bring full inhibition of PS II functioning since FV/FM was about 0.450 after 120 min. exposition. The results might indicate a potential of Antarctic Zygnema in the studies focused on resistance to heavy metals and phytoremediation technologies.

scholarly journals Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. II. Analysis of non-photochemical quenching mechanisms activated by low to medium light doses

2014 ◽  
Vol 4 (1) ◽  
pp. 90-99 ◽  
Author(s):  
Petra Očenášová ◽  
Miloš Barták ◽  
Josef Hájek
Keyword(s):  
High Light ◽  
Photochemical Quenching ◽  
Ps Ii ◽  
Chlorophyll Fluorescence Parameters ◽  
Main Emphasis ◽  
James Ross Island ◽  
Quenching Mechanisms ◽  
Non Photochemical Quenching ◽  
Short Time ◽  
Energy Dependent

The paper focus sensitivity of an Antarctic lichen Usnea antarctica to photoinhibition studied under controlled laboratory conditions. Main emphasis was given to the analysis of quenching mechanisms, i.e. deexcitation pathways of absorbed light energy exploited in non-photochemical processes. Thalli of U. antarctica were collected at the James Ross Island, Antarctica (57°52´57´´ W, 63°48´02´´ S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to medium light intensities (300, 600 and 1000 mmol m-2 s-1 of photosynthetically active radiation) for 6 h. Before and during photoinhibitory treatments, chlorophyll fluorescence parameters, photoinhibitory (qI), state 1-2 transition (qT), and energy-dependent quenching (qE) in particular were measured to evaluate dose- and time-dependent changes in these parameters. The results showed that among the components forming non-photochemical quenching (qN), qI contributes to the largest extent to qN, while qE and qT contribute less. This finding differs from our earlier studies made in a short term-, and high light-treated U. antarctica that found qE together with qI is the most important part of non-photochemical quenching. Possible explanation is that photoinhibition in PS II in U. ant-arctica, when induced by low to medium light, activates qE to only limited extend and for a relatively short time (tens of minutes). With prolonged high light treatment lasting several hours, qE tends to be reduced to the values close to zero and qI then forms a major part of qN.

Parameters Affecting Dye Adsorption - Using Graphene Coated Sand (GSC)

2018 ◽  
Vol 4 (02) ◽  
Author(s):  
Seroor Atalah Khaleefa Alia ◽  
Dr. Mohammed Ibrahimb ◽  
Hussein Ali Hussein
Keyword(s):  
Heavy Metals ◽  
Contact Time ◽  
Organic Dyes ◽  
Low Cost ◽  
Dye Adsorption ◽  
Contaminated Water ◽  
Maximum Adsorption Capacity ◽  
Engineering Designs ◽  
Heavy Metals Ions ◽  
Coated Sand

Adsorption is most commonly applied process for the removal of pollutants such as dyes and heavy metals ions from wastewater. The present work talks about preparing graphenic material attached sand grains called graphene sand composite (GSC) by using ordinary sugar as a carbon source. Physical morphology and chemical composition of GSC was examined by using (FTIR, SEM, EDAX and XRD). Efficiency of GSC in the adsorption of organic dyes from water was investigated using reactive green dye with different parameters such as (ph, temperature, contact time and dose). Adsorption isotherm was also studied and the results showed that the maximum adsorption capacity of dye is 28.98 mg/g. This fast, low-cost process can be used to manufacture commercial filters to treat contaminated water using appropriate engineering designs.

Possibilities of microscopic detection of heavy metals ions in plant tissues

2010 ◽  
Vol 196 ◽  
pp. S294
Author(s):  
R. Kizek ◽  
O. Krystofova ◽  
P. Babula ◽  
M. Beklova ◽  
L. Havel ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Plant Tissues ◽  
Microscopic Detection ◽  
Heavy Metals Ions

Sequential removal of heavy metals ions and organic pollutants using an algal-bacterial consortium

Chemosphere ◽  
2006 ◽  
Vol 63 (6) ◽  
pp. 903-911 ◽  
Author(s):  
Raul Muñoz ◽  
Maria Teresa Alvarez ◽  
Adriana Muñoz ◽  
Enrique Terrazas ◽  
Benoit Guieysse ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Organic Pollutants ◽  
Bacterial Consortium ◽  
Removal Of Heavy Metals ◽  
Heavy Metals Ions

scholarly journals Synthesis of Fe3O4@PVBC–TMT nanoparticles for the efficient removal of heavy metals ions

RSC Advances ◽  
2019 ◽  
Vol 9 (69) ◽  
pp. 40546-40552 ◽  
Author(s):  
Zhiming Chen ◽  
Jiaojiao Song ◽  
Qingpeng Zhu ◽  
Zhiguo Li ◽  
Renchun Yang
Keyword(s):  
Heavy Metals ◽  
Core Shell ◽  
Magnetic Adsorbent ◽  
Efficient Removal ◽  
Removal Of Heavy Metals ◽  
Heavy Metals Ions

Core–shell Fe3O4@PVBC–TMT nanoparticles were fabricated and served as a valid magnetic adsorbent for the removal of heavy metals ions.

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