akinete


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akinete

  1. a specialized CELL found in certain CYANOBACTERIA that resists desiccation and cold and provides an overwinter PROPAGULE.
  2. a non-motile resting CELL.
  3. a non-motile SPORE.
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The morphological analysis was performed based on the measurement of vegetative cells (n = 400), heterocysts (n = 100 to 200) and akinetes (n = 60 to 150), determined using a binocular microscope (Nikon E200, Melville, NY, USA) with an ocular measurement coupled to the system.
Measurement and standard deviation of length and width pattern of vegative cells, heterocytes and akinetes, were calculated using a Microsoft Excel program (Microsoft Office 2007) in four conditions tested and graphs produced using the Bioestat 5.
Production of akinetes only occurred under some conditions.
Variations in cell morphometry and the absence of akinetes in both strains were related to the lower temperature condition (21[degrees]C);
Akinetes are long or short cylindrical with rounded ends or elliptical, adjacent to heterocytes or distant.
Heterocystscylindric, intercalary, 5-7 [micro]m in diameter and 7-20 [micro]m long, akinetes elongate, cylindric, solitary formed near the middle of the trichome but not adjacent to the heterocyst, 6-8 [micro]m in diameter and 20-60 [micro]m long (Fig.
It is represented by free floating trichomes with heterocysts intercalated and akinetes (Van Geel et al.
1994: Fossil akinetes of Aphanizomenon and Anabaena, as indicators for medieval phosphate-eutrophication of Lake Gosciaz (Central Poland).
Mature trichomes also contain spores called akinetes.
The originally undifferentiated filaments become entrapped in a cup-shaped indusium which triggers their differentiation into akinetes.
Each megaspore contains a small colony of Anabaena azollae filaments bearing akinetes.
Approximately 10 Anabaena species were identified in the fresh material; however, establishing the dominant species when counting was difficult, as frequently only pieces of filaments without akinetes and heterocysts were found in the counting chamber.