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18 juin 2024 · Lancefield groups: Lancefield groups are a classification system for streptococci based on the carbohydrate composition of their cell wall antigens. Developed by Rebecca Lancefield, these groups help in identifying and differentiating pathogenic streptococci.
Il y a 6 jours · Rebecca Lancefield describes a method of producing streptococcal antigens and sera for use in precipitin tests and suggests that this approach can be used epidemiologically to identify the probable origin of a given strain. References: 1. Rebecca Craighill Lancefield, Pioneer Microbiologist, ASM News. 41,1975. p.805.
- Karen Yee
- 2018
13 juin 2024 · The Lancefield system for classifying a particular category of bacteria was created by a microbiologist named Rebecca Lancefield (1891 to 1985). The bacteria that she studied belonged to the family Streptococcaceae and were Gram-positive and catalase-negative.
19 juin 2024 · Join us as we celebrate five of these exceptional women: Fanny Hesse, Ruth Ella Moore, Jessie Isabelle Price, Rebecca Lancefield, and Abigail Salyers. Read More Page
7 juin 2024 · Among the lactic species, S. lactis and S. cremoris are used in commercial starters for the production of butter, cultured buttermilk, and certain cheeses. Streptococci generally are classified by the type of carbohydrate contained in the cell wall, a system called the Lancefield classification.
- The Editors of Encyclopaedia Britannica
15 juin 2024 · 1933: Rebecca Lancefield, an American bacteriologist, developed the Lancefield grouping system, classifying streptococci based on their carbohydrate antigens, leading to the identification of Group A and Group B Streptococcus among others.
Rebecca Lancefield differentiated streptococci on the basis of differences in their: patterns of hemolysis on blood agar. cell wall carbohydrates in a serological test. All of the choices are correct. ability to produce catalase. gram stain appearance.
