Plant Biology Bis1c

Plant Biology Bis1c - Lecture 20 - Protista T h e P r o t...

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Lecture 20 - Protista The Protista - paraphyletic Generalized life cycles Algal groups Dinophyta, Bacillariophyta, Rhodophyta, Phaeophyta, Chlorophyta The transition to land
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Phycology Examination of algae, the photosynthetic group of protists
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Why are Algae important? 1- Food Brown and red algae eaten regularly as vegetable. Brown alga (kelp) used as vegetable in China and Japan Red alga (porphyra) eaten as sushi 3- Fertilizer 4- Production of alginates A group of substances used as thickening agent & colloid stabilizer in: food, cosmetics, pharmaceutical and paper industries 2- Protection Shelter for fish and invertebrates
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Why are Algae important? 5- Agar Mucilaginous material derived form red algae cell walls & used in: Culture media for bacteria and microorganisms Gel electrophoresis Capsule that contain vitamin and drugs Dental impressions material Cosmetics Anti-drying agent in bakeries; Jellies and desserts Temporary preservative of meat and fish Carrageenan derived from red alga used for stabilization of emulsion of paints and cosmetics& dairy products Diatomaceous earth
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Colonial (Volvox ) Giant Kelp ( Macrocystis pyrifera ) An array of unicellular diatoms under the light microscope
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The Dinophyta The Dinoflagellates (Dinophyta) – Related to Paramecium (protozoan) - ingest food! – Fresh water and marine – Their nuclear membranes do not disintegrate during cell division – Their chromosomes are always condensed and have no histones – Have two flagella - one in groove around cell and another vertical, they spin as the flagella beat – They have cellulose plates in vesicles inside the outer cell membrane – They cause red tides and toxic blooms in water. Gymnodinium breve is the cause. Large bodies of water can turn reddish brown. Toxins cause neurologic damage – Have chl a, c and carotenoids, chloroplasts have 4 membranes – They can occur as symbionts in coral reefs – Bioluminescent forms! – They can form resting cysts under low nutrient conditions – Haploid cells - make haploid swimming gametes that fuse to make dipoid zygote. After a resting period the zygote undergoes meiosis
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Dinophyta Two flagella - movement like a spinning top Plasmamembrane Cellulose plates inside vesicles
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Dinophyta
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Peridinium , a salt-water dinoflagellate,. SEM X460. Credit: © Dr. Dennis Kunkel/Visuals Unlimited Dinoflagellate Flagella in perpendicular grooves
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A bioluminescent dinoflagellate ( Pyrodinium bahamense ). SEM X2600.
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Plant Biology Bis1c - Lecture 20 - Protista T h e P r o t...

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