| 词汇 | amylopectin |
| 释义 | BETA Examples of amylopectinamylopectin isn’t in the Cambridge Dictionary yet. You can help! The smaller amylopectin granules have a more irregular surface and particulate internal content. Undoubtedly there will be an element of contrast matching between the disaccharide trehalose and amylopectin, which explains the indistinct edge of amylopectin granules. Although no carbohydrate-specific staining has been utilized, amylopectin granules have been found to bind the conventional heavy metal stains used for thin section electron microscopy. The changes were characteristic of those produced by increasing hydration of amylopectin/starch granules. Exactly why the apicomplexan parasites utilize amylopectin rather than glycogen as their storage carbohydrate is unclear. The amylopectin granules have irregular oval shape, but they all exhibit a smooth surface and there is a narrow size range (approx. 0.1- 0.3 mm). Negative staining of isolated amylopectin granules revealed some ultrastructural features not readily visible in sectioned material. Within the membrane-enclosed oocyst residuum large amylopectin granules (0.1-0.3 mm) can be found besides a characteristic large lipid body and a crystalline protein inclusion. The substructure of the amylopectin granules has been investigated by negative staining and their stability in the presence of glycohydrolases and following brief heat treatment assessed. Amylopectin is used for carbohydrate storage in different life-stages of a number of apicomplexan parasites. Cryoelectron microscopy of fully hydrated unstained and negatively stained amylopectin granules provided supportive data that conforms well with that from air-dry negative staining. Amylopectin granules sedimented to the bottom of the tube. The membrane-enclosed residual body contains a characteristic large lipid body, numerous amylopectin granules and a crystalline protein inclusion, along with more finely dispersed material (ribosomes) and cytomembranes. Amylopectin (starch) granules are known to become progressively hydrated with increasing temperature and ultimately they form a gel. Whereas the rapidly replicating tachyzoite stage normally lacks polysaccharide granules, the dormant bradyzoite (in tissue cysts) and the sporozoite (in the oocyst) possess numerous amylopectin granules. Digestion of the amylopectin granules with enzymes known to cleave complex branched polysaccharide chains is likely to yield useful structural information as to the granule composition. High amylopectin starches will have a stable gel, but will be softer than high amylose gels. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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