English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

A new, quantitatively significant intermediate formed during lignin degradation byStreptomyces viridosporus T7A was isolated and characterized. InStreptomyces -inoculated cultures, the intermediate, an acid-precipitable, polyphenolic, polymeric lignin (APPL), accumulated in the growth medium. The APPL was a water-soluble polymer probably consisting of a heterogeneous mixture of molecular weight components of ≥20,000. APPLs were precipitable from culture filtrates after they had been acidified to pH &lt;3 to 5. Noninoculated controls yielded little APPL, but supernatant solutions from inoculated cultures produced quantities of APPL that correlated with the biodegradability of the lignocellulose type. Maximal recovery of APPL was obtained from corn lignocellulose, reaching 30% of the initial lignin present in the substrate. APPLs contained small amounts of carbohydrate, organic nitrogen, and inorganic materials. The lignin origin of APPLs was confirmed by chemical analyses, which included acidolysis, permanganate oxidation, elemental analyses, functional group analyses, nuclear magnetic resonance spectroscopy, and14 C isotopic techniques. Analyses of APPLs from corn lignocelluloses showed thatS. viridosporus -degraded APPLs were lignin derived but significantly different in structure from APPLs derived from uninoculated controls or from a standard corn milled-wood lignin. Degraded APPLs were enriched in phenolic hydroxyl groups and, to a small extent, in carboxyl groups. Degradative changes appeared to be largely oxidative and were thought to involve substantial cleavage ofp -hydroxy ether linkages and methoxyl groups in the lignin.

Lignin Degradation by Streptomyces viridosporus : Isolation and Characterization of a New Polymeric Lignin Degradation Intermediate