Related Experiment Video
Updated: Jan 31, 2026

An Optimized Rhizobox Protocol to Visualize Root Growth and Responsiveness to Localized Nutrients
Published on: October 22, 2018
A new flavanol from the roots of Daphne genkwa
Rui Wang1, Ling Tong1, Cai-Yun Liu1
1Key Laboratory of Biochemistry and Molecular Biology in Universities of Shandong Province, Weifang University, Weifang 261061, China.
Abstract:
The phytochemical investigation of the roots of Daphne genkwa yielded six secondary metabolites, including a new flavanol derivative, (2R, 3S)-5,7,4'-trihydroxy-8-methoxycarbonylflavanol (1), and five known compounds (2-6). The molecular structures of the isolated constituents were elucidated on the basis of extensive spectroscopic analysis, including UV, IR, NMR, and MS, and comparison with literature data. Furthermore, the cytotoxic activity of 1 and 2 against A549, HL-60, SMMC-7721, MCF-7, and SW480 cell lines was also described.
More Related Videos
Related Concept Videos
Primary and Secondary Growth in Roots and Shoots
Root Mean Square
For example, consider the velocity of gas molecules in a container. The gas molecules are moving in different directions, which might impart positive and negative...
Properties of the Root Locus
To determine if a point lies on the root locus, the criterion involves the sum of angles contributed by all poles and zeros to that point. Specifically, this sum must be an odd multiple of 180 degrees. The gain at any point on...
Root-Locus Method
This system can be represented by a block...
Construction of Root Locus
For positive gain values, the root locus exists on the real axis to the left of an odd number of finite open-loop poles or zeros. The root locus starts at the open-loop poles and traces the paths of the closed-loop poles as the gain...
Plotting and Calibrating the Root Locus
The maximum gain occurs at the breakaway points between open-loop poles on the real axis, while the minimum gain is...

