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Dryopteris fragrans (L.) Schott is a deciduous perennial herb, which has been used traditionally for treatment of ringworm infections and others skin diseases in the north of China.
Two new alkaloid glycosides (1-2), two new amide alkaloids (3 and 6), and two new amine alkaloids (4 and 5), were isolated from Scindapsus officinalis (Roxb.) Schott., along with four known alkaloids (7-10). Structural elucidation of the isolated compounds was established by spectroscopic analysis, especially 2D NMR techniques and comparison with literatures. The absolute configurations of compounds 1 and 2 were determined by the electronic circular dichroism calculations. Compound 1 represent the first exa...
Dryopteris fragrans (L.) Schott is a fern growing on the surface of hot rocks and lava. It is exposed to sunlight directly and bears local hot environment. We sequenced the complete nucleotide sequence of its chloroplast (cp) genome. The cp genome was 151,978 bp in length, consisting of a large single-copy region (85,332 bp), a small single-copy region (31,947 bp) and a pair of inverted repeats (17,314 bp). The cp genome contained 112 genes and 345 RNA editing sites in protein-coding genes. Simple s...
Taro (Colocasia esculenta L. Schott) is an important staple food crop in tropical and developing countries, having high water requirements. The purpose of this study was to evaluate the feasibility of using carbon and nitrogen isotopic composition (δC and δN) as a physiological indicator of taro response to drought, and elucidation of the relationship between the water use efficiency (WUE) under drought conditions and carbon isotope discrimination (ΔC). As an alternative to WUE determination, obtained by...
Superadsorbent hydrogel was prepared from lignin and montmorillonite for Cu(II) ions removal, and the chemical structure and morphology of the hydrogel were characterized by FT-IR, XRD, SEM and XPS. The swelling kinetics of the prepared hydrogel was investigated, and the result showed that the swelling process fit the Schott second-order dynamic equation. The influences of pH, contact time, Na concentration, and initial Cu(II) ion concentration on adsorption were studied, and the maximum adsorption value wa...
A hybrid hydrogel based on acrylic acid monomer/wheat bran, supported by montmorillonite was synthesized using in-situ polymerization and utilized as an adsorbent to remove Cu (II) ions from an aqueous solution at batch condition. The structural and morphological microanalysis of adsorbents was carried out by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray powder diffraction techniques. The type of water diffusion into the adsorbents was Fickian and the swelling process has f...