microbiology

Selective media can be used to  inhibit unwanted bacterial and thereby differentiate bacterial types. Media for isolating intestinal pathogens (MacConkey agar, Hektoen enteric (HE) agar) contain bile salts as a selective…

Motility Test: The motility test uses a semisolid medium. Agar is typically 1.5% to 0.4% which is just enough to maintain its form while allowing movement of motile bacteria. A tetrazolium…

Generally Enterobacteriaceae are the largest group of medically important bacteria which comprise a family of Gram negative rods that mostly inhabit the intestinal tract. The port of entry into the human…

Bacteria are classified according to 1) morphology 2) gram stain as well as 3) growth requirements. (1) Morphology See right hand column (2) Gram stain: is the most important tool for…

Medically Important Gram +  Genus--species Shape Metabolism Diagnosis Symptoms Virulence factors location transmission Therapy Staphylococci cocci clusters facultative anaerobes         beta lactams --S. aureus     alpha…

Morphology (Shell Shape) and Arrangement Bacterial cells are much smaller than eukaryotic cells and come in a variety of morphologies (shapes) and arrangements. Determining cell morphology is an important first…

Bacteria have contributed significantly to the rise in infectious diase. Bacteria as a class include a huge number of organisms, generally classified by biochemical characteristics (i.e., Gram stain characteristics) or morphological…