WordNet

first in order of importance; "the alpha male in the group of chimpanzees"; "the alpha star in a constellation is the brightest or main star"
the 1st letter of the Greek alphabet
the beginning of a series or sequence; "the Alpha and Omega, the first and the last, the beginning and the end"--Revelations
early testing stage of a software or hardware product; "alpha version"
relating to or involving or causing hemolysis; "hemolytic anemia" (同)haemolytic
any high mountain

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アルファ(ギリシア語アルファベットの第1字A,α;英語のA,aに相当) / アルファ星(星座の主星)
高山,高峰

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2014/12/07 18:50:35」(JST)

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Hemolyses of Streptococcus spp.
(left) α-hemolysis (S. mitis);
(middle) β-hemolysis (S. pyogenes);

(right) γ-hemolysis (= non-hemolytic, S. salivarius)

Hemolysis (or haemolysis in British English) is the breakdown of red blood cells. The ability of bacterial colonies to induce hemolysis when grown on blood agar is used to classify certain microorganisms. This is particularly useful in classifying streptococcal species. A substance that causes hemolysis is a hemolysin.

Types

Alpha

When alpha hemolysis (α-hemolysis) is present, the agar under the colony is dark and greenish. Streptococcus pneumoniae and a group of oral streptococci (Streptococcus viridans or viridans streptococci) display alpha hemolysis. This is sometimes called green hemolysis because of the color change in the agar. Other synonymous terms are incomplete hemolysis and partial hemolysis. Alpha hemolysis is caused by hydrogen peroxide produced by the bacterium, oxidizing hemoglobin to green methemoglobin.

Beta

Beta hemolysis (β-hemolysis), sometimes called complete hemolysis, is a complete lysis of red cells in the media around and under the colonies: the area appears lightened (yellow) and transparent. Streptolysin, an exotoxin, is the enzyme produced by the bacteria which causes the complete lysis of red blood cells. There are two types of streptolysin: Streptolysin O (SLO) and streptolysin S (SLS). Streptolysin O is an oxygen-sensitive cytotoxin, secreted by most Group A streptococcus (GAS), and interacts with cholesterol in the membrane of eukaryotic cells (mainly red and white blood cells, macrophages, and platelets), and usually results in β-hemolysis under the surface of blood agar. Streptolysin S is an oxygen-stable cytotoxin also produced by most GAS strains which results in clearing on the surface of blood agar. SLS affects immune cells, including polymorphonuclear leukocytes and lymphocytes, and is thought to prevent the host immune system from clearing infection. Streptococcus pyogenes, or Group A beta-hemolytic Strep (GAS), displays beta hemolysis.

Some weakly beta-hemolytic species cause intense beta hemolysis when grown together with a strain of Staphylococcus. This is called the CAMP test.^[1] Streptococcus agalactiae displays this property. Clostridium perfringens can be identified presumptively with this test. Listeria monocytogenes is also positive on sheep's blood agar.

Gamma

If an organism does not induce hemolysis, the agar under and around the colony is unchanged, and the organism is called non-hemolytic or said to display gamma hemolysis (γ-hemolysis). Enterococcus faecalis (formerly called "Group D Strep") displays gamma hemolysis.

Hemedigestion

This is the nonspecific killing of blood cells by metabolic by-products of bacteria. This can be seen on a blood agar plate, when the blood surrounding the confluent part of your streak turns green, but there is no change around single colonies. Hemedigestion is seen with Vibrio cholerae.

Notes

^ The CAMP test is so called from the initials of those who initially described it, R. Christie, N. E. Atkins, and E. Munch-Peterson. It distinguishes Streptococcus agalactiae from the others.

References

Ray, C. George; Ryan, Kenneth J.; Kenneth, Ryan (July 2004). Sherris Medical Microbiology: An Introduction to Infectious Diseases (4th ed.). McGraw Hill. p. 237. ISBN 978-0-8385-8529-0. LCCN 2003054180. OCLC 52358530.

UpToDate Contents

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English Journal

Microbial Flora and Antibiotic Resistance in Peritonsillar Abscesses in Upstate New York.

Plum AW1, Mortelliti AJ2, Walsh RE2.
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Telavancin as an Alternative Treatment for Gram-Positive Bloodstream Infections in Patients with Cancer: A Case Control Study.

Chaftari AM, Hachem R, Jordan M, Garoge K, Al Hamal Z, El Zakhem A, Viola GM, Granwehr B, Mulanovich V, Gagel A, Reitzel R, Yousif A, Jiang Y, Raad I1.
Antimicrobial agents and chemotherapy.Antimicrob Agents Chemother.2015 Oct 19. pii: AAC.00617-15. [Epub ahead of print]
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