Serology

The proteins and polysaccharides that make up a bacterium are sometimes characteristic enough to be considered identifying markers. The most useful of these are the molecules that make up surface structures including the cell wall, glycocalyx, flagella, and pili. For example, some species of Streptococcus contain a unique carbohydrate molecule as part of their cell wall that can be used to distinguish them from other species. These carbohydrates, as well as any distinct proteins or polysaccha-

Nester-Anderson-Roberts: I II. The Microbial World I 10. Identification and I I © The McGraw-Hill

Microbiology, A Human Classification of Companies, 2003

Perspective, Fourth Edition Prokaryotes

Gram stain

Positive

Negative

Good Carb Diet

Good Carb Diet

WHAT IT IS A three-phase plan that has been likened to the low-carbohydrate Atkins program because during the first two weeks, South Beach eliminates most carbs, including bread, pasta, potatoes, fruit and most dairy products. In PHASE 2, healthy carbs, including most fruits, whole grains and dairy products are gradually reintroduced, but processed carbs such as bagels, cookies, cornflakes, regular pasta and rice cakes remain on the list of foods to avoid or eat rarely.

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