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MICROBIOLOGY

MICROBIOLOGY. LECTURE:CYANOBACTERIA. 1. GENERAL CHARACTERISTICS. -THOUSANDS OF SPECIES -600 MILLION YRS. OLD, FOSSIL EVIDENCE -FORMERLY CALLED “BLUE-GREEN ALGAE. A. PROKARYOTE. -NO INTERNAL STRUCTURES -SMALL COMPARED TO EUKARYOTES

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MICROBIOLOGY

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  1. MICROBIOLOGY LECTURE:CYANOBACTERIA

  2. 1. GENERAL CHARACTERISTICS -THOUSANDS OF SPECIES -600 MILLION YRS. OLD, FOSSIL EVIDENCE -FORMERLY CALLED “BLUE-GREEN ALGAE

  3. A. PROKARYOTE -NO INTERNAL STRUCTURES -SMALL COMPARED TO EUKARYOTES -CELL FUNCTIONS OCCUR IN CYTOPLASM RESPIRATION MOSTLY NEAR CELL MEMBRANE -

  4. . -CHEMICAL ANALYSIS: IDENTICAL TO PHOTO-SYNTHETIC BACTERIA, COMPLETELY DIFFERENT FROM EUKARYOTIC ALGAE

  5. B. NUTRITION -AUTOTROPHIC: CHLOROPHYLL CAN BE MANY COLORS, MOST COMMON SPECIES HAVE BLUE GREEN CHLOR. CONTAINING CYANIDE “FIX” NITROGEN: NO2 CONVERTED TO NH3 NATURAL SOURCE OF “NITROGEN” FOR PROTEINS

  6. C. MORPHOLOGY -UNICELLULAR & IN FILAMENTS -SOME HAVE GELATINOUS SHEATH (TOXIC?) -NO FLAGELLA, BUT SOME CAN GLIDE -COLOR PIGMENTS: CAROTENE, ERYTHRIN

  7. . -OIL BUBBLES: FOOD STORAGE & FLOTATION -HETEROCYSTS: LOOK EMPTY BUT NITROGEN “FIXING”

  8. ENDOSPORES: SURVIVAL TECHNIQUE

  9. D. HABITAT -ANYPLACE WITH WATER AND LIGHT -SPECIES ADAPTED TO ALL ENVIRONMENTS -UNIQUELY RESISTANT TO EXTREMES OF pH, TEMPERATURE, CHEMICALS -PRODUCE OIL WHICH FOULS LAKES, PONDS(PETROLEUM?), SMELLS VERY BAD -SOME PRODUCE POISONS HARMING FISH & ANIMALS

  10. E. REPRODUCTION -ASEXUAL ONLY – BINARY FISSION

  11. F. EXAMPLES -POLYCYSTIS, GLEOCAPSA, OSCILLATORIA, NOSTOC, ANABENA & LYNGBYA

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