2、革兰氏染色 ⚫ Gram Stain - developed Christian Gram in 1884 ⚫ The gram stain is the most widely used staining procedure in bacteriology. It is called a differential stain since it differentiates between gram-positive and gram-negative bacteria. Bacteria which stain purple with the gram staining procedure are termed gram-positive; those which stain pink are said to be gram￾negative. ⚫ Gram-positive and gram-negative bacteria stain differently because of fundamental differences in the structure of their cell walls.2、革兰氏染色 ⚫ Gram Stain - developed Christian Gram in 1884 ⚫ The gram stain is the most widely used staining procedure in bacteriology. It is called a differential stain since it differentiates between gram-positive and gram-negative bacteria. Bacteria which stain purple with the gram staining procedure are termed gram-positive; those which stain pink are said to be gram￾negative. ⚫ Gram-positive and gram-negative bacteria stain differently because of fundamental differences in the structure of their cell walls