Metal accumulation by bryophytes in some zinc-rich blanket bogs, Selwyn Mountains, Yukon Territory

1984 ◽  
Vol 62 (4) ◽  
pp. 722-728 ◽  
Author(s):  
Julian Lee ◽  
Ian R. Jonasson ◽  
Wayne D. Goodfellow
Keyword(s):  
Metal Accumulation ◽  
Enrichment Factors ◽  
Yukon Territory ◽  
Zinc Silicate ◽  
Sulphide Deposit ◽  
Cell Replacement ◽  
Relative Enrichment ◽  
Humified Peat

Collections of Pohlia wahlenbergii, Leptobryum pyriforme, Philonotis fontana, and Drepanocladus aduncus were made at the XY Zn–Pb sulphide deposit, Howard's Pass, Y.T., Canada. Brilliant lime green growths of mosses flourish in hillside blanket bogs fed by Zn-, Pb-, and Cd-rich spring waters derived from faults which crosscut sulphide mineralizations. All species showed elevated levels of accumulation of these metals, but the concentration of Zn in the upper thalli was higher than Pb or Cd. However, the relative enrichments favour accumulation of Pb rather than Cd and Zn. The bryophyte D. aduncus is unusual in that it gathers cadmium in preference to Pb and Zn, according to calculated relative enrichment factors. The bog materials which provide the substrate for moss blankets are unusual in composition; more than 60% of the material comprises secondary Zn minerals, viz., zincic calcite ((Zn,Ca)CO3), smithsonite (ZnCO3), and wurtzite (ZnS), and the remainder is humified peat derived from buried moss strata. The end product of burial and replacement of decaying moss layers is the hydrated zinc silicate, hemimorphite (Zn4Si2O7(OH)2∙H2O), which results from the cell by cell replacement of moss fibre with complete preservation of the rhizoid structure.

scholarly journals Spatial Distribution and Relative Enrichment of Some Upper-Group Trace Elements in Rhizosphere of Highly Anthropized and Rapidly Developing Tropical Environment

2021 ◽  
Author(s):  
Andrew Tyopine ◽  
Sunday E. Obalum ◽  
Chukwuma Okoye ◽  
Charles Igwe
Keyword(s):  
Trace Elements ◽  
Inductively Coupled Plasma ◽  
Soil Layer ◽  
Enrichment Factors ◽  
Tropical Region ◽  
Similar Distribution ◽  
Agricultural Activities ◽  
Reference Element ◽  
Southeastern Nigeria ◽  
Relative Enrichment

Abstract Most upper-group (Groups 13-17) trace elements are toxic including those already confirmed as micronutrients considering the very thin margin between their adequacy and toxicity in the biosphere. The concentrations, distribution and relative enrichment were studied of some of these elements in 0-50-cm soil layer at Ikwo in southeastern Nigeria representing largely disturbed and rapidly evolving ecosystems of the humid tropical region. Samples was from the north (N), south (S), east (E) and west (W) zones with pronounced mining and agricultural activities, including a reference zone at the centre (F). The samples were taken from fallow lands in the dry season. The concentrations of the trace elements were determined using Inductively Coupled Plasma Atomic Emission Spectroscopy. Enrichment factor was calculated as the ratio of each element to that of Fe (as a reference element) in the soil. The elements had their highest concentrations in F-zone and lowest in N-zone, with top-bottom ranges as 21.00-10.75, 1.83-0.93, 10.90-5.58, 4.05-2.05, 4.97-2.54, 2.20-1.12, 17.75-9.09, 26.74-13.69, 4.41-2.26, and 1.89-0.96 mg kg–1 for Se, As, B, Al, Si, S, Sn, Sb, I and Br, respectively. Thus mining and agricultural activities, rather than leading to the build-up of these elements, tend to contribute towards reducing their levels in the rhizosphere. Enrichment factors indicated moderate-to-insignificant levels of the majority of the elements in the soils. Generally, the elements showed similar distribution and enrichment patterns across the five zones. These results suggest that, at their current modes and intensities in the humid tropics, mining and agricultural activities apparently may not pose any ecological hazards due to these trace elements.

scholarly journals Bioindication of Heavy Metals in a Waterfall Outflow Using a Bryophyte Community

2021 ◽  
Author(s):  
Narin Printarakul ◽  
Weeradej Meeinkuirt
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
National Park ◽  
Metal Accumulation ◽  
Anthropogenic Activities ◽  
Heavy Metal Stress ◽  
Enrichment Factors ◽  
Heavy Metal Accumulation ◽  
Natural Processes ◽  
Aquatic Bryophytes

Abstract Huay Pah Lahd stream in Doi Suthep-Pui National Park, Thailand, is potentially vulnerable to nearby anthropogenic activities. In this study, we determined heavy metal accumulation in bryophyte tissue and their growth substrates. Enrichment factors (EFs) of heavy metals were employed to monitor concentrations in bryophyte tissue. Of eight bryophyte taxa investigated, Scopelophila cataractae showed the highest capacity to accumulate metals in tissue, particularly Fe, Zn, Cd and Cu in protonemata (8,026.7, 1,187.2, 16.9 and 530.1 mg kg-1, respectively). Furthermore, the endangered and rare bryophyte taxa S. cataractae and Porella acutifolia were found intermingled with other urban and common aquatic bryophytes. These taxa might be considered sensitive warning organisms for heavy metal stress in stream ecosystems induced by environmental pollution. Because EFs of all heavy metals were < 2, this suggests that natural processes are the key source of heavy metals; furthermore, the environment of this National Park was identified as being heathy, and an important ecosystem buffer and biodiversity haven.

scholarly journals Conjugated enrichments in arsenic and antimony in marine deposits used as paleoenvironmental proxies: preliminary results

2021 ◽  
Vol 192 ◽  
pp. 39
Author(s):  
Nicolas Tribovillard
Keyword(s):  
Marine Sediments ◽  
Enrichment Factors ◽  
Shuttle Effect ◽  
Preliminary Results ◽  
Marine Deposits ◽  
Relative Enrichment ◽  
Wide Range ◽  
Geological Formations ◽  
As If

Two redox-sensitive metalloids, arsenic (As) and antimony (Sb), are examined here to determine what can be their help in the deciphering of past depositional conditions. The enrichment factors of the two elements are compared for a set of geological formations and marine deposits covering a relatively wide range of paleoenvironmental settings, from oxic to euxinic conditions. This work confirms that As and Sb are not robust paleoredox proxies but examining their relative enrichment may be useful. These preliminary results indicate that a co-enrichment of both elements with Sb being more enriched than As could be the mark of the so-called particulate shuttle effect. Notably, Sb would be more sensitive to Mn-shuttling than As. If confirmed, this trend could be used to further identify the cause of As-enrichment in marine sediments impacted by cold seepage fluids.

EFFECT OF SEWAGE SLUDGE APPLICATION ON WHEAT CROP PRODUCTIVITY AND HEAVY METAL ACCUMULATION IN SOIL AND WHEAT GRAIN

2017 ◽  
Vol 16 (5) ◽  
pp. 1093-1100 ◽  
Author(s):  
Diana Mariana Cocarta ◽  
Viorica Ruxandu Subtirelu ◽  
Adrian Badea
Keyword(s):  
Heavy Metal ◽  
Sewage Sludge ◽  
Metal Accumulation ◽  
Crop Productivity ◽  
Heavy Metal Accumulation ◽  
Wheat Crop ◽  
Wheat Grain ◽  
Sludge Application

Drug Design of Inhibitors of Alzheimer’s Disease (AD): POM and DFT Analyses of Cholinesterase Inhibitory Activity of β-amino di-Carbonyl Derivatives

2019 ◽  
Vol 19 (8) ◽  
pp. 688-705
Author(s):  
Taibi Ben Hadda ◽  
Abdur Rauf ◽  
Hsaine Zgou ◽  
Fatma Sezer Senol ◽  
Ilkay Erdogan Orhan ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Cholinesterase Inhibitors ◽  
Metal Accumulation ◽  
Microtiter Plate ◽  
Metal Chelation ◽  
Carbonyl Derivatives ◽  
Cholinesterase Inhibitory Activity ◽  
Inhibitory Potential

Background:Since deficit of acetylcholine has been evidenced in the Alzheimer’s disease (AD) patients, cholinesterase inhibitors are currently the most specified drug category for the remediation of AD.Method:In the present study, 16 compounds (1-16) with dicarbonyl skeletons have been synthesized and tested for their inhibitory potential in vitro against AChE and BChE using ELISA microtiter plate assays at 100 μg/mL. Since metal accumulation is related to AD, the compounds were also tested for their metal-chelation capacity.Results and Conclusion:All the investigated dicarbonyl compounds exerted none or lower than 30% inhibition against both cholinesterases, whereas compounds 2, 8 and 11 showed 37, 42, 41% of inhibition towards BChE, being the most active. The highest metal-chelation capacity was observed with compound 8 (53.58 ± 2.06%). POM and DFT analyses are in good harmonization with experimental data.

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