Attacked by Radicals
نویسندگان
چکیده
منابع مشابه
Pectic polysaccharides are attacked by hydroxyl radicals in ripening fruit: evidence from a fluorescent fingerprinting method
BACKGROUND AND AIMS Many fruits soften during ripening, which is important commercially and in rendering the fruit attractive to seed-dispersing animals. Cell-wall polysaccharide hydrolases may contribute to softening, but sometimes appear to be absent. An alternative hypothesis is that hydroxyl radicals ((•)OH) non-enzymically cleave wall polysaccharides. We evaluated this hypothesis by using ...
متن کاملFingerprinting of polysaccharides attacked by hydroxyl radicals in vitro and in the cell walls of ripening pear fruit.
Hydroxyl radicals (*OH) may cause non-enzymic scission of polysaccharides in vivo, e.g. in plant cell walls and mammalian connective tissues. To provide a method for detecting the action of endogenous *OH in vivo, we investigated the products formed when polysaccharides were treated with *OH (generated in situ by ascorbate-H(2)O(2)-Cu(2+) mixtures) followed by NaB(3)H(4). Treatment with *OH inc...
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متن کاملDenesting by Bounded Degree Radicals
Given a nested radical involving only d-th roots we show how to compute an optimal or near optimal depth denesting of this nested radical by a nested radical that involves only D-th roots, where D is an arbitrary multiple of d. As a special case the algorithm can be used to compute denestings as in previous papers by S. Landau and Horng/Huang. The running times of the algorithms are polynomial ...
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ژورنال
عنوان ژورنال: Science
سال: 2013
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.340.6133.662-c