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Introduction to eubacteria

History

1. They were first observed in rainy water and later in teeth scum by Leeuwenhoek (1675) and called them “Animalcule”.

This discovery was published in his book “The Secrets of Nature Discovered by Leeuwenhoek”.

2. F. J. Cohn and Ehrenberg first of all coined the name “Bacteria”.

3. Bergey placed bacteria in “Prosophyta group” and wrote a book “Manual of Determinative Microbiology”. This book is known as “Bible of

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Structure of Eubacteria

Bacterial cell have a chemically complex cell envelope. The cell envelope consists of a tightly bound three layered structure.

  1. Outermost glycocalyx (may be capsule or slime layer)

  2. Cell wall

  3. Cell membrane

Although each layer of the envelope performs distinct function they act together as a single protective unit.

1. Capsule or Glycocalyx or Slime layer -

  • When bacteria are surrounded by capsule, called as capsulated bacteria. Formation of capsule is
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