华中农业大学微生物英文
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Size, Shape, and Arrangement of Bacterial Cells
Most bacteria fall within a range from 0.2 to 2.0 μm in diameter and from 2 to 8μm in length.
Cm = 10-2 meter mm = 10-3 meter μm = 10-6 meter nm = 10-9 meter
Arrangement of Spherical Bacterial Cells
diplococci
sarcinae
streptococci tetracocci
staphylococci
Spherical coccus
The Micrococcaceae
The family Micrococcaceae contains gram-positive cocci, 0.5-2.5 μm in diameter, that divide in more than one plane to form regular or irregular clusters of cells. All are aerobic or facultatively anaerobic. The peptidoglycan di-amino acid is L-lysine.
Sinபைடு நூலகம்le bacillus
Diplobacilli streptobacilli
Coccobacillus
Spore-forming rod shaped bacteria
Almost all Spore-forming bacteria are Gram+
Bacillus – Aerobic Bacillus subtilis, B. Mycoides B. Pastturii B. megaterium B. Thuringiensis B. Anthracis B. Botulinus B. cereus
They have a few basic shapes-spherical coccus (plural, cocci, meaning berries), rod-shaped bacillus (plural, bacilli, meaning little staffs), and spiral.
staphylococci
staphylococci
Streptococcus - facultatively anaerobic or microaerophilic, catalase negative, gram-positive, Cell arranges in pairs or chains, usually nonmotile,
Chaper 3 The Prokaryotes
Section 1 Section 2 Section 3 Section 4 Section 5
Bacteria Actinomycetes Cyanobacteria Archaeobacteria Other prokaryotes
Bacteria
Staphylococcus - facultatively anaerobic, grampositive, usually form irregular clusters, nonmotile, catalase positive but oxidase negative, ferment glucose anaerobically.
A few species are anaerobic rather than facultative.
Rod-shaped bacteria
Bacilli divide only across their short axis, so there are fewer groupings of bacilli than of cocci.
Clostridium – Anaerobic
Clostridium botulinus C. butyricum C. aceticum C. tetani C. putrificum
Nonspore - forming rod shaped bacteria
Most nonspore – forming rod shaped bacteria are Gram-
How to identify an unknown bacterial species ?
The thousands of species of bacteria are differentiated by many factors, including morphology (shape), chemical composition (often detected by staining reactions), nutritional requirements, biochemical activities, and source of energy (sunlight or chemicals).
The three most important genera are:
Micrococcus Staphylococcus Streptococcus
Micrococcus – aerobic, gram-positive, catalase positive, cell arranges mainly in pairs, tetrads, or irregular clusters, nonmotile. They are often yellow, orange or red in colour
Representatives: Escherchia coli Alcaligenes Proteus Flavobacteria Pseudomonas Rhizobium Azotobacter
Most bacteria fall within a range from 0.2 to 2.0 μm in diameter and from 2 to 8μm in length.
Cm = 10-2 meter mm = 10-3 meter μm = 10-6 meter nm = 10-9 meter
Arrangement of Spherical Bacterial Cells
diplococci
sarcinae
streptococci tetracocci
staphylococci
Spherical coccus
The Micrococcaceae
The family Micrococcaceae contains gram-positive cocci, 0.5-2.5 μm in diameter, that divide in more than one plane to form regular or irregular clusters of cells. All are aerobic or facultatively anaerobic. The peptidoglycan di-amino acid is L-lysine.
Sinபைடு நூலகம்le bacillus
Diplobacilli streptobacilli
Coccobacillus
Spore-forming rod shaped bacteria
Almost all Spore-forming bacteria are Gram+
Bacillus – Aerobic Bacillus subtilis, B. Mycoides B. Pastturii B. megaterium B. Thuringiensis B. Anthracis B. Botulinus B. cereus
They have a few basic shapes-spherical coccus (plural, cocci, meaning berries), rod-shaped bacillus (plural, bacilli, meaning little staffs), and spiral.
staphylococci
staphylococci
Streptococcus - facultatively anaerobic or microaerophilic, catalase negative, gram-positive, Cell arranges in pairs or chains, usually nonmotile,
Chaper 3 The Prokaryotes
Section 1 Section 2 Section 3 Section 4 Section 5
Bacteria Actinomycetes Cyanobacteria Archaeobacteria Other prokaryotes
Bacteria
Staphylococcus - facultatively anaerobic, grampositive, usually form irregular clusters, nonmotile, catalase positive but oxidase negative, ferment glucose anaerobically.
A few species are anaerobic rather than facultative.
Rod-shaped bacteria
Bacilli divide only across their short axis, so there are fewer groupings of bacilli than of cocci.
Clostridium – Anaerobic
Clostridium botulinus C. butyricum C. aceticum C. tetani C. putrificum
Nonspore - forming rod shaped bacteria
Most nonspore – forming rod shaped bacteria are Gram-
How to identify an unknown bacterial species ?
The thousands of species of bacteria are differentiated by many factors, including morphology (shape), chemical composition (often detected by staining reactions), nutritional requirements, biochemical activities, and source of energy (sunlight or chemicals).
The three most important genera are:
Micrococcus Staphylococcus Streptococcus
Micrococcus – aerobic, gram-positive, catalase positive, cell arranges mainly in pairs, tetrads, or irregular clusters, nonmotile. They are often yellow, orange or red in colour
Representatives: Escherchia coli Alcaligenes Proteus Flavobacteria Pseudomonas Rhizobium Azotobacter