18.1 Nonsporulating Firmicutes Sarcina八叠球菌 Obligate anaerobes Extremely acid tolerant Can inhabit and grow in stomachs of monogastric animals分布于单胃动物的胃中 (a) (b) 2012 Pearson Education,Ine
Chen Feng, Microbiology, SJTU • Sarcina 八叠球菌 – Obligate anaerobes – Extremely acid tolerant – Can inhabit and grow in stomachs of monogastric animals 分布于单胃动物的胃中 18.1 Nonsporulating Firmicutes
18.1 Nonsporulating Firmicutes Lactic Acid Bacteria乳酸菌 Streptococcus链球菌 ·Homofermentative同型发酵 Play important roles in production of buttermilk,silage, and other products Some species are pathogenic Lactococcus:genera of dairy significance乳球菌属 Enterococcus:genera of fecal origin肠球菌属 (a) (b) 2012 Pearson Education,Inc
Chen Feng, Microbiology, SJTU – Streptococcus 链球菌 • Homofermentative 同型发酵 • Play important roles in production of buttermilk, silage, and other products • Some species are pathogenic – Lactococcus: genera of dairy significance 乳球菌属 – Enterococcus: genera of fecal origin 肠球菌属 Lactic Acid Bacteria 乳酸菌 18.1 Nonsporulating Firmicutes
Table 18.2 Differentiation of the principal genera of lactic acid bacteriaa Cell form and arrangement Genus Cocci in chains or tetrads Homofermentative Streptococcus Enterococcus Lactococcus Pediococcus Heterofermentative Leuconostoc Rods,typically in chains Homofermentative Lactobacillus Heterofermentative Lactobacillus aThe physiology of homofermentative and heterofermentative lactic acid bacteria is cov- ered in Section 14.2. 2012 Pearson Education.Inc
Lactobacillus乳杆菌属 业aupn Rod-shaped -Common in dairy (a) products Resistant to acidic conditions ·Grow in pH as low as4 (b) (c) 2012 Pearson Education,Ine
Chen Feng, Microbiology, SJTU • Lactobacillus 乳杆菌属 – Rod-shaped – Common in dairy products – Resistant to acidic conditions • Grow in pH as low as 4 18.1 Nonsporulating Firmicutes
18.1 Nonsporulating Firmicutes Listeria李斯特菌属 Gram-positive coccobacilli Form chains 3-5 cells long -Require full oxic or microoxic conditions for growth CHEN FENG,MICROBIOLOGY,SJTU
Chen Feng, Microbiology, SJTU • Listeria 李斯特菌属 – Gram-positive coccobacilli – Form chains 3–5 cells long – Require full oxic or microoxic conditions for growth 18.1 Nonsporulating Firmicutes