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Differences between A and R strains of streptococcus pneumoniae?
Wiki User
∙ 14y ago
One type responds to antibiotics and the other does not. In other words type you can kill and the other type can kill you.
Wiki User
∙ 14y ago
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Why are encapsulated of Streptococcus pneumoniae much more likely to cause disease that strains that do not produce a capsule?
Capsules are quite difficult to penetrate. The capsule of Streptococcus pneumoniae prevents phagocytic white blood cells from engulfing and destroying this bacterial pathogen. Thus, our immune system has a struggle to eradicate it.
Why are encapsulated strains of streptococcus pneumonia much more likely to cause disease than strains that do not produce a capsule?
Capsules are quite difficult to penetrate. The capsule of Streptococcus pneumoniae prevents phagocytic white blood cells from engulfing and destroying this bacterial pathogen. Thus, our immune system has a struggle to eradicate it.
What is the importance of Capsule forming bacteria?
Certain bacteria that cause pneumonia, notably Klebsiella pneumoniae and Streptococcus pneumoniae, exist as both an encapsulated and unencapsulated form. The encapsulated form of these bacteria are protected by a polysaccharide (short chain carbohydrate) capsule, which shields the bacteria from the host's immunilogical response, and confers virulence, or the ability to cause disease, to the encapsulated strains of these bacteria.
What is Falcon Polymyxin B Sulfate and Trimethoprim Ophthalmic solution?
Polymyxin B Sulfate and Trimethoprim Ophthalmic Solution is indicated in the treatment of surface ocular bacterial infections, including acute bacterial conjunctivitis, and blepharo conjunctivitis, caused by susceptible strains of the following microorganisms: Staphylococcus aureus, Staphylococcus epidermidis, Streptococcus pneumoniae, Streptococcus viridans, Haemophilus influenzae and Pseudomonas aeruginosa.
What did Avery's theory provide evidence for?
Ostwald T. Avery's experiment was an extension of the works of Griffith's. Griffith's experiment using virulent and avirulent Streptococcus pneumoniae (which had different colony characteristics) proved that it was possible for the heat killed virulent Streptococcus pneumoniae to pass on the genetic information for formation of smooth colonies to avirulent strains. Avery, Mc Leod and Mc Carty conclusively found out that the genetic material responsible for transfer of characteristics between the strains was DNA. This was achieved by incubating the cell lysate of virulent Streptococcus with proteases, RNAses and DNAses separately before mixing it with avirulent strains. It was found that only when the lysate was incubated with DNAses did the transfer of smooth colony formation characteristic from the virulent strain to the avirulent strain fail to occur.
Who was the scientist who demonstrated genetic tranformation by injected mice with two different strains of Streptococcus pneumoniae bacteria?
The scientist was Frederick Griffith, in 1928. Although he believed proteins were involved, it was actually the transfer of DNA. The harmless pneumonia bacteria acquired the DNA from the killed viruses, and became equally lethal.
How does streptococcus test for gelatinase?
The gelatin hydrolysis test is used to test if a microbe produces gelitinase. If the gelatin turns liquid that means gelatinase is present. Streptococcus is one of many strains that can be tested this way.
What was the importance of Griffith's work with strains of the bacterium Streptococcus penuemoniae?
Bacteria exposed to DNA can incorporate the DNA and change phenotype.
What has the author Sharon Cross written?
Sharon Cross has written: 'The surface structures and adhesive properties of Streptococcus Milleri group strains'
Is cellulitis caused by a virus?
No, it is caused by normal skin bacteria bacteria entering a wound. It is usually one of the milder strains of Streptococcus or Staphylococcus.
What is the differences between the Petite and Grande strains of Saccharomyces cerevisiae?
petite strain lacks a mitochondria so it is unable to yield energy from aerobic metabolism
Why are encapsulated strains much more likely to cause disease than strains that do not produce a capsule?
Some bacterial cells are surrounded by an extracellular slime layer called a capsule or glycocalyx. This structure can play a protective role for certain pathogenic bacteria such as streptococcus pneunoniae. The capsule prevents phagocytic white blood cells from engulfing and destroying this bacterial pathogen, enabling the organism to invade the lungs and cause pneumonia. The capsule is also a means for many bacteria to attach to solid surfaces in the environment.
