Effect of Cadmium on Cellular Viability in Two Species of Microalgae (Scenedesmus sp. and Dunaliella viridis) |
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Authors: | Letty Beatriz C Marcano Ingrid M Carruyo Xiomara M Montiel Carolina B Morales Patricia Moreno de Soto |
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Institution: | (1) Facultad Experimental de Ciencias, Departamento de Biología, Universidad Del Zulia, Maracaibo, Zulia, Venezuela;(2) Facultad de Medicina, Universidad Del Zulia, Maracaibo, Zulia, Venezuela;(3) Urbanización Monte Bello AV 11a con calle Q N° 12–21, Maracaibo, Zulia, 4001, Venezuela |
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Abstract: | We determined the effect of several concentrations of cadmium (0, 5, 10, and 20 μg/l) on cellular viability in the microalgae
Scenedesmus sp. and Dunaliella viridis, by measuring growth at 0, 24, 48, 72, and 96 h and pigment production at 10 days. Algae were obtained from the Nonvascular
Plant Laboratory collection, in the Facultad Experimental de Ciencias, Universidad del Zulia, Venezuela. Growth was measured
by cellular counting, while pigment content was evaluated using conventional spectrophotometric techniques. Growth of both
species decreased in the exposed cultures comparing with the control, but its behavior was similar, because in both control
and exposed cultures, its was observed an adaptive phase in the first hours, as well as a growth phase after 72 h. Cadmium
concentrations above 10 μg/l produced an adverse effect on pigment production, depending on the concentration and/or exhibition
time. However, even though cadmium inhibited growth and pigment production, levels of both parameters indicated cellular viability,
demonstrating the adaptability of the algae cultures when they were exposed to the metal. |
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Keywords: | Cadmium Scenedesmus sp Dunaliella viridis Growth Pigment production |
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