Peroxisome nucleoid

Be able to describe the structures and general functions of cell walls, plasma membranes, nucleus and nucleoid region, mitochondria, lysosomes, peroxisomes, endoplasmic reticulum, cytoskeleton, and extracellular matrix. 

Fig. 320. Hepatocellular (block 668) peroxisome containing eccentrically placed nucleoid material. Unmedicated male 200 g rat. Under pentobarbital anaesthesia (30 mg/kg), the animal was perfused from the abdominal aorta with 2.5 % glutaraldehyde in 0.1 M sodium cacodylate buffer (pH 7.4). Postfixation with 1 % osmium tetroxide in sodium cacodylate buffer. Embedded in Epon 812 and sectioned at 50 nm. Lead citrate and uranyl acetate. Plate 3158...

One characteristic of many, but not all peroxisomes, is the presence of a nucleoid and, therefore, three different types of microbodies have been distinguished those with one crystalloid nucleoid, those with several smaller nucleoids (subcrystalloids), and those without nucleoid. The physiological meaning of the presence or absence of nucleoid is not clear except for the fact that the nucleoid contains urate oxidase. Apparently those microbodies which do not contain urate oxidase are also devoid of nucleoid. 

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See also in sourсe #XX -- [ ]

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