Dichotomus key gram postive bacteria coccus Lab Report

Dichotomus key gram postive bacteria coccus - Lab Report Example However, so is the gram-(+) Streptococcus and Enterococcus. In fact, they are collectively known as the gram-(+) cocci. Thus, to differentiate them, we use the catalase test, which determines whether an organism is able to convert the toxic hydrogen peroxide into water and oxygen. Of the four main gram-(+) cocci genera, only Staphylococcus and Micrococcus are catalase-(+). We then try to grow it on Mannitol Salt Agar. The genus of Micrococcus is unable to use mannitol for food, and thus will not grow on MSA medium. On the other hand, Staphylococcus is able to grow on MSA because they can oxidize mannitol. Finally, we try to determine whether the unknown is S. aureus or S. epidermidis by growing it on blood agar. Since it did not cause hemolysis, then the organism is S. epidermidis, because S. aureus is a known alpha-hemolytic organism. http://www.mesacc.edu/~aleid84161/personalhomepage/Flow%20Charts.pdf, n.

Photo essay Example | Topics and Well Written Essays - 250 words - 1

Photo - Essay Example clean, sparkling waters that perfectly magnify and reflect the images that are visually seen: the large brightly lit observation wheel, the skyscrapers equally lighted, and the distant array of high-rise buildings that brighten the deep blue skies. As one views these waterfronts, one could just marvel at the serenity of the waters amidst the busy commercial sector that is displayed beyond it. Visitors are enticed by the cleanliness and serenity of the waters, both in Tokyo and in Singapore, despite being located beside highly industrialized cities. One could also note that there were no evident traces of smog or air pollution from the photos, reflecting the ability of the cities to maintain the pristine condition of their surroundings, and their abilities to preserve and conserve the natural resources. At the time these photos were taken, it is evident that the time frame could be potentially similar – nearly approaching nighttime but the blue skies proved that it is night has not appropriately arrived. The greater numbers of bright lights from the photo of the waterfronts of Singapore prove that this was taken at a closer time frame to nighttime than that of the Tokyo