Freshwater Algae-البرنامج التدريبي كيميائي مياه الدرجة الثانيه

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Introduction to Freshwater Algae
General introduction
 Algae are widely present in freshwater environments, such as lakes and rivers.
 They are typically present as micro-organisms visible only with the aid of a light microscope.
 They have a major importance in the freshwater environment, both in terms of fundamental ecology and in relation to human use of natural resources.
 The word ‘algae’ originates from the Latin word for seaweed and is now applied to a broad assemblage of organisms that can be defined both in terms of morphology and general physiology.
 They are simple organisms, without differentiation into roots, stems and leaves and their sexual organs are not enclosed within protective coverings.
 In terms of physiology, they are fundamentally autotrophic (obtaining all their materials from inorganic sources) and photosynthetic generating complex carbon compounds from carbon dioxide and light energy.
 These organisms include both prokaryotes (cells lacking a membrane bound nucleus) and eukaryotes (cells with a nucleus plus typical membrane-bound organelles).


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