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The microalga Haematococcus pluvialis Flotow has been the subject of a number of studies concerned with maximizing astaxanthin production for use in animal feeds and for human consumption. Several of these studies have specifically attempted to ascertain the optimal temperature and irradiance combination for growth of H. pluvialis, but there has been a great deal of disagreement between laboratories. Ideal levels of temperature and irradiance have been reported to range from 14 to 28�C and 30 to 200 ?mol photons m?2 s?1. The objective of the present study was to simultaneously explore temperature and irradiance effects for a single strain of H. pluvialis (UTEX 2505) across an experimental region that encompassed...
This study describes the toxic effects of different prominent aquatic pollutants?heavy metals (Cd & Pb), pesticides (alphamethrin and deltamethrin) and salt (NaCl)?on the intracellular proline content in the cyanobacterium, Westiellopsis prolifica?Janet strain?NCCU331. Despite a reduction in growth (measured as chlorophyll a content), the intracellular proline content increased in the presence of heavy metals, pesticides and high salt concentration. The intracellular cyanobacterial proline accumulation was more pronounced under salt stress than in the presence of pesticides and heavy metals. We have also compared whether or not anionic components influence heavy metal toxicity. It was found that the chlorides of...