Pigmentation Information and Courses from MediaLab, Inc.
These are the MediaLab courses that cover Pigmentation and links to relevant pages within the course.
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The heavy black pigmentation in the macrophages present in this image (see arrow) is hemosiderin - a storage form of recycled iron. This is a bronchioalveolar lavage(BAL) sample from a patient that had pneumonia-like symptoms with two episodes of unexplained drops in hemoglobin without obvious external bleeding.The large amount of hemosiderin is a reflection of the amount of intra-alvelolar bleeding that was causing both the drop in hemoglobin and the pneumonia symptoms.
|The colonies shown in the blood (BAP) agar (upper) and MacConkey (MAC) agar (lower) biplate are a 24 hour growth from an aerobic blood culture bottle that became positive at 12 hours after inoculation. The appearance of the colonies on MAC agar rules out the following two bacterial species:||View Page|
|Staph on Blood Agar|
The image of the surface of a 5% sheep blood agar illustrates the colonies that grew out of the foot drainage after 24 hours at 35C. They are entire, convex, smooth, and have a slight yellow pigmentation. Hemolysis is not observed. A Gram stain was prepared from one of the isolated colonies.
|Rhodotorula is a yeast that may be found in:||View Page|
|Match each hyaline mold from the drop-down list to its corresponding colony and microscopic description. The mold colonies are illustrated in the image on the right.||View Page|
|The dimorphic fungus that may produce black, yeast-like colonies after prolonged incubation at 37°C is:||View Page|
|The growth of the colonies shown in the upper image was obtained on blood agar from a sputum specimen after 8 days of incubation at 30°C. The lower image is a photomicrograph of a lactophenol blue mount made from a portion of the colony. The diagnosis is:||View Page|
|This image illustrates a lactophenol blue mount of a mold recovered after 7 days incubation of brain heart infusion broth. The large macroconidia suggests the mold form of Histoplasma capsulatum. However, there is the possibility that this mold represents its saprophytic counterpart, which is:||View Page|
|This image illustrates a lactophenol blue mount prepared from a mold recovered after 7 days incubation on brain heart infusion broth. The individual microconidia, each borne by a delicate conidiophore, suggests the mold form of Blastomyces dermatitidis. However, there is the possibility that this mold represents its saprophytic counterpart, which is called:||View Page|
|Match the names of each of the yeast species with its most likely colony morphology as seen in the images on the right.||View Page|
|The colonies shown in this photograph were grown on Guizotia abyssinica (bird seed) agar at 30°C for 72 hours. The most likely identification is:||View Page|
|The colony shown in the upper image was recovered from peritoneal fluid of a patient receiving continuous peritoneal dialysis. The lower image is a photomicrograph prepared from a small portion of the colony illustrating the microscopic morphology. Each of the following species of yeast can be eliminated except:||View Page|