The effect of silicon on the planarian Polycelis felina (Daly.) in laboratory conditions

Jelenković, David (2012) The effect of silicon on the planarian Polycelis felina (Daly.) in laboratory conditions. Diploma thesis, Faculty of Science > Department of Biology.

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Abstract

Silicon is one of the most frequent element in Earth Crust. It is an essential element at lower live forms. Its biological function in higher forms of live is not known. Silicon effect on Polycelis felina (Daly.), which is convenient test organism in such studies, has not been analyzed in laboratory yet. Planarian were treated with 6 different concentrations: 0,17 g/dm3, 0,20 g/dm3, 0,23 g/dm3, 0,25 g/dm3, 0,27 g/dm3 and 0,30 g/dm3 of sodium metasilicate and monitored in period of 14 days. Followed changes were mortality rate, morphological, behavioral and histological-cytological changes. Results where compared with one negative and two positive control group. With this experiment it has been established that sodium metasilicate, depending of dosage of applied concentration, causes: mortality, depigmentation, behavioral changes, disorientated movement, intensive contraction and decefalization. On histological slides there is visible damage of mucus layer and basal membrane as all cellular structures. With tissue analysis a great amount of silicone was found in the body of planarian.

Item Type: Thesis (Diploma thesis)
Keywords: sodium metasilicate, depigmentation, contractions, decephalization, regeneration
Supervisor: Kalafatić, Mirjana
Date: 2012
Number of Pages: 52
Subjects: NATURAL SCIENCES > Biology
Divisions: Faculty of Science > Department of Biology
Depositing User: Grozdana Sirotic
Date Deposited: 25 Feb 2014 13:07
Last Modified: 02 May 2017 08:27
URI: http://digre.pmf.unizg.hr/id/eprint/499

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