The sulfur bacteria use sulfur or sulfur compounds as electron acceptors in their metabolism. influenzae is a cause of meningitis in children, while P. The genera Pasteurella, Haemophilus, and Actinobacillus are among the important members of the group. They are distinguished from vibrios and enterobacteria by their small size and inability to move. The pasteurellas belong to the family Pasteurellaceae. This production of light is known as bioluminescence. Species of Photobacterium are marine organisms known for their ability to produce light as a result of chemical actions stimulated by the enzyme luciferase. Members of the genus Aeromonas and Plesiomonas are involved in human intestinal disease. One species, Vibrio cholerae, is the cause of cholera in humans. Vibrios are curved, Gram‐negative, facultatively anaerobic rods. All enterobacteria have peritrichous flagella. The well‐known organism Escherichia coli is also a member of this group. Among the medically important enterobacteria are Salmonella species that cause intestinal disease known as salmonellosis Yersinia pestis, the cause of plague Klebsiella species, the causes of pneumonia, intestinal disease, and other infections and species of Serratia and Proteus. Over 25 genera of enterobacteria are recognized, many with pathogenic importance. Members of the enterobacteria group are members of the family Enterobacteriacae classified in section 5 of Bergey's Manual. Enterobacteria are facultatively anaerobic, Gram‐negative rods that inhabit the human intestine. Members of the genus Azotobacter form a resting cell called a cyst, which withstands drying and environmental stresses.Įnterobacteria. The plants then use the nitrogen compounds for the synthesis of amino acids and proteins, which serve as an extremely valuable food source for animals and humans. These Gram‐negative rods live free in the soil (Azotobacter) or on the roots of legume plants (Rhizobium) and use their enzymes to convert atmospheric nitrogen into organic molecules useful to the plant. Species of Azotobacter and Rhizobium are extremely important for their ability to fix nitrogen in the environment. aeruginosa, causes urinary tract infections and infections of burned tissue.Īzotobacter and Rhizobium. Over 30 species are found in the group, and Pseudomonas fluorescens is a well‐known producer of a yellow‐green pigment. Pseudomonads are aerobic, Gram‐negative rods that are motile with polar flagella. The comma‐shaped Bdellovibrio bacteriovorus is the most thoroughly studied species of the group. The host bacterium is killed in the process. It then takes biochemical control of the host cell and grows in the space between the cell wall and plasma membrane. The organism attaches to the surface of a bacterium, rotates, and bores a hole through the host cell wall. Bdellovibrios are aerobic Gram‐negative, curved rods that prey on other bacteria. Viral Diseases of the Reproductive Systemīdellovibrios.Bacterial Diseases of the Reproductive System.Fungal and Protozoal Diseases of the Reproductive System.Bacterial Diseases of the Digestive System.Parasitic Diseases of the Digestive System.Protozoal Diseases of the Digestive System.Viral Diseases of the Respiratory System.Bacterial Diseases of the Respiratory System.
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