Related Experiment Video
Updated: Aug 5, 2026

Scanning Electron Microscopy (SEM) Protocols for Problematic Plant, Oomycete, and Fungal Samples
Published on: February 3, 2017
Rare benzannulated spiroketal dimers from an endophytic Chaetomium sp
Jun-Jiang Li1, Yin-Yin Wang1, Hu Liu1
1School of Biological Science and Technology, University of Jinan, Jinan, China.
Abstract:
Three undescribed dimeric benzannulated spiroketals (1 - 3) were isolated from the fermented broth of Chaetomium sp. UJN-EF006, an endophytic fungal strain derived from Vaccinium bracteatum. Structures of these distinctive fungal products were elucidated by comprehensive spectroscopic analyses, and their absolute configurations were determined via electronic circular dichroism analyses. Of note, compounds 2 and 3 were unstable under normal storage condition, and three transformation products (3a - 3c) derived from 3 were further separated and structurally characterised. The inhibitory activities of available compounds against α-glucosidase, along with human MDA-MB-231 and A549 carcinoma cells, were also evaluated, with 3c exhibiting significant cytotoxicity.
Related Concept Videos
Bacterial Phylum Spirochaetes
Bacterial Phylum Tenericutes
Chirality at Nitrogen, Phosphorus, and Sulfur
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
Radicals: Electronic Structure and Geometry
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
Stereoisomerism of Cyclic Compounds
Fungal Phylum Microsporidia
![Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F60786.jpg&w=3840&q=50)
