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Abraham, Jeeva Susan
- Assessment of Heavy Metal Toxicity in Four Species of Freshwater Ciliates (Spirotrichea:Ciliophora) from Delhi, India
Abstract Views :333 |
PDF Views:96
Authors
Jeeva Susan Abraham
1,
S. Sripoorna
1,
Ashish Choudhary
1,
Ravi Toteja
1,
Renu Gupta
2,
Seema Makhija
1,
Alan Warren
3
Affiliations
1 Acharya Narendra Dev College, University of Delhi, Delhi 110 019, IN
2 Maitreyi College, University of Delhi, Delhi 110 021, IN
3 Department of Life Sciences, Natural History Museum, London, SW7 5BD, GB
1 Acharya Narendra Dev College, University of Delhi, Delhi 110 019, IN
2 Maitreyi College, University of Delhi, Delhi 110 021, IN
3 Department of Life Sciences, Natural History Museum, London, SW7 5BD, GB
Source
Current Science, Vol 113, No 11 (2017), Pagination: 2141-2150Abstract
In vitro laboratory experiments were conducted to determine the toxicity (per cent survival and LC50) of essential and non-essential heavy metals (cadmium, copper, nickel, lead and zinc) in four spirotrich ciliates: Euplotes sp., Notohymena sp., Pseudourostyla sp. and Tetmemena sp. isolated from three different freshwater ecosystems in the Delhi region, India. The toxicity of the heavy metals was found to vary among the different ciliates. Copper was most toxic (24 h-LC50 value ranged between 0.125 and 0.74 mg/l) and zinc was least toxic (24 h LC50 value ranged between 46.98 and 144.32 mg/l) to each of the ciliates. Of the four ciliates, Notohymena sp. had the highest tolerance limit to three heavy metals (Cu, Cd and Pb) out of the five tested. This study shows the high potentiality of using freshwater ciliates for monitoring the intensity and potency of ecological damage caused by heavy metals in aquatic ecosystems.Keywords
Ciliates, Freshwater, Heavy Metals, Toxicity.Full Text
References
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- Cellular and Molecular Basis of Heavy Metal-Induced Stress in Ciliates
Abstract Views :368 |
PDF Views:110
Authors
Sripoorna Somasundaram
1,
Jeeva Susan Abraham
1,
Swati Maurya
1,
Seema Makhija
1,
Renu Gupta
2,
Ravi Toteja
1
Affiliations
1 Ciliate Biology Laboratory, Acharya Narendra Dev College, University of Delhi, Kalkaji, New Delhi 110 019, IN
2 Maitreyi College, University of Delhi, Bapudham Complex, Chanakyapuri, New Delhi 110 021, IN
1 Ciliate Biology Laboratory, Acharya Narendra Dev College, University of Delhi, Kalkaji, New Delhi 110 019, IN
2 Maitreyi College, University of Delhi, Bapudham Complex, Chanakyapuri, New Delhi 110 021, IN
Source
Current Science, Vol 114, No 09 (2018), Pagination: 1858-1865Abstract
Globally, heavy metals are the major pollutants present in both terrestrial and aquatic ecosystems. Increase in their concentration due to various anthropogenic activities is a matter of concern. Higher concentration of these metals is known to be toxic due to their non-biodegradable nature. Eukaryotic microorganisms, ciliates can be used as cellular tools to assess and study the various mechanisms to overcome heavy metal toxicity. Here we discuss, at cellular level, the effect of heavy metal toxicity on growth rate, behavioural and morphological changes of ciliates. At the molecular level, changes in stress genes like hsp70, metallothionein and expression of various antioxidant enzymes (superoxide dismutase, glutathione peroxidase) adopted by ciliates have also been deliberated. It is also being argued that ciliates can be used as biosensor/cellular tools for detecting heavy metal pollution.Keywords
Ciliates, Heat Shock Protein, Heavy Metal Stress, Metallothionein, Superoxide Dismutase.Full Text
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