2023年8月7日 · Acid-fast bacteria, also known as acid-fast bacilli or simply AFB, are a group of bacteria sharing the characteristic of acid fastness. Acid fastness is a physical property that gives a bacterium the ability to resist decolorization by acids during staining procedures.

Acid-fastness is a physical property of certain bacterial and eukaryotic cells, as well as some sub-cellular structures, specifically their resistance to decolorization by acids during laboratory staining procedures. [1][2] Once stained as part of a sample, these organisms can resist the acid and/or ethanol-based decolorization procedures common...

Acid-fast bacillus (AFB) is a type of bacteria that causes tuberculosis and other types of mycobacterial infections, such as leprosy (Hansen's disease). AFB tests are usually ordered for people with symptoms of active tuberculosis, commonly known as TB.

原理：细菌经 龙胆紫 初染和碘液媒染后，在细胞壁内形成了不溶于水的龙胆紫与碘的复合物，革兰氏阳性菌 (G+)由于其细胞壁较厚、肽聚糖网层次较多且交联致密，故遇乙醇脱色处理时，因失水反而使网孔缩小，再加上它不含类脂，故乙醇处理不会出现缝隙，因此，能把复合物牢牢留在壁内，使其仍呈蓝紫色；而革兰氏阴性菌 (G-)因其细胞壁薄、外膜层类脂含量高、肽聚糖层薄且交联度差，在遇 脱色剂 后，以类脂为主的外膜迅速溶解，薄而松散的肽聚糖网不能阻挡复合物的溶 …

2023年8月7日 · Acid-fast bacteria, also known as acid-fast bacilli or simply AFB, are a group of bacteria sharing the characteristic of acid fastness. Acid fastness is a physical property that gives a bacterium the ability to resist decolorization by acids during staining procedures.

2024年12月7日 · These examples of Acid-fast bacteria (AFB) comprise a unique group of microorganisms characterized by their ability to resist decolorization by acid-alcohol during staining processes. This property is due to mycolic acids—long-chain fatty acids in their cell walls that give these bacteria distinct structural and functional characteristics.

The acid fast bacterial cell envelope is a specialized derivation of the gram-positive cell envelope that has an extremely high lipid content. Acid-fast bacteria include the Mycobacteria and some of the Nocardia. The acid-fast staining property results from the presence of membrane glycolipids and very long chain 2-alkyl-3-hydroxy fatty acids ...

2023年5月28日 · What Is an AFB Stain? Your doctor may use an acid-fast bacteria (AFB) stain test to see if you have a lung disease like tuberculosis (TB). In addition to showing tuberculosis, an AFB stain can...

Acid-fast bacteria belong to a distinctive suprageneric actinomycete taxon, which includes mycobacteria, corynebacteria, nocardia, rhodococci, and other closely related genera. All of these bacteria share the property of having an unusual cell …

2020年6月1日 · Acid-fast bacteria (also known as acid-fast bacilli or AFB) are microorganisms resistant to acids and/or ethanol-based decolorization procedures common in many staining protocols, hence, the term acid-fast.