Patrick R. Murray Basic Medical Microbiology Ebook PDF download

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Patrick R. Murray Basic Medical Microbiology Ebook PDF download

Patrick R. Murray Basic Medical Microbiology Ebook PDF download

Patrick R. Murray Basic Medical Microbiology Ebook PDF download Bacteria are a bit more complex, with both RNA and DNA, metabolic machinery for self-replication, and a complex cell wall structure.

Bacteriaare prokaryotic organisms; that is, simple unicellular organisms with no
nuclear membrane, mitochondria, Golgi bodies, or endoplasmic
reticulum and they reproduce by asexual division. The key feature that is
used to separate most bacteria is their staining property, with the Gram
stain and acid-fast stain the most important. Most bacteria are either
gram-positive (retain the blue dye) or gram-negative (lose the blue stain
and stain with the red dye). These bacteria are then subdivided by their
shape (either spherical [cocci] or rod-shaped), whether they grow aerobically or anaerobically (many bacteria grow in both atmospheres and are called facultative anaerobes), and whether they form resilientspores or not (only gram-positive rods are spore-formers). The other important bacterial stain is the acid-fast stain that is retained only by a
few bacteria that have a characteristic lipid-rich cell wall. This group is further subdivided by how difficult it is to remove the acid-fast stain (the stain is named because an acid solution removes the stain from most other bacteria).

Finally, there are groups of organisms that do not stain with these procedures so they are separated by other features, such as shape (spiral-shaped bacteria) or their need to grow inside a host cell
(e.g., leukocyte) or cell cultures in the laboratory.

Patrick R. Murray Basic Medical Microbiology Ebook PDF download

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