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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

MICROBIOLOGY

LECTURE:CYANOBACTERIA

1 general characteristics
1. GENERAL CHARACTERISTICS

-THOUSANDS OF SPECIES

-600 MILLION YRS. OLD, FOSSIL EVIDENCE

-FORMERLY CALLED “BLUE-GREEN ALGAE

a prokaryote
A. PROKARYOTE

-NO INTERNAL STRUCTURES

-SMALL COMPARED TO EUKARYOTES

-CELL FUNCTIONS OCCUR IN CYTOPLASM RESPIRATION MOSTLY NEAR CELL MEMBRANE

-

slide5
.

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

b nutrition
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

c morphology
C. MORPHOLOGY

-UNICELLULAR & IN FILAMENTS

-SOME HAVE GELATINOUS SHEATH (TOXIC?)

-NO FLAGELLA, BUT SOME CAN GLIDE

-COLOR PIGMENTS: CAROTENE, ERYTHRIN

slide8
.

-OIL BUBBLES: FOOD STORAGE & FLOTATION

-HETEROCYSTS: LOOK EMPTY BUT NITROGEN “FIXING”

d habitat
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

e reproduction
E. REPRODUCTION

-ASEXUAL ONLY – BINARY FISSION

f examples
F. EXAMPLES

-POLYCYSTIS, GLEOCAPSA, OSCILLATORIA, NOSTOC, ANABENA & LYNGBYA

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