18 research outputs found
Structure elucidation and NMR assignments of an alkaloid from <i>Ixeris chinensis</i> Nakai
<p>A new alkaloid, 2-amino-1,6-dihydro-pyridine-5-carbaldehyde (<b>1</b>), together with four known compounds, namely 4-hydroxybenzaldehyde (<b>2</b>), 4-hydroxyacetophenone (<b>3</b>), acetophenone-4-O-<i>β</i>-d-glucoside (<b>4</b>), 2-hydroxyl-6-methoxyacetophenone-4-O-<i>β</i>-d-glucoside (<b>5</b>), were isolated from the CHCl<sub>3</sub> extract from <i>Ixeris chinensis</i> Nakai. The structures of <b>1</b> was elucidated by spectroscopic methods, including UV, IR, HR-ESI-MS and extensive 1D and 2D NMR techniques.</p
A new sesquiterpene from <i>Ixeris chinensis</i>
<div><p>The petroleum ether (PE) extract from <i>Ixeris chinensis</i> was submitted to chromatographic separation. A new sesquiterpene, namely 14-noreudesma-3-hydroxy-3-en-2,9-dione, was isolated from the PE extract. The structures of the sesquiterpene was elucidated by using spectroscopic methods, including UV, IR, HR-ESI-MS and extensive 1D and 2D NMR techniques.</p></div
Temporal relationships between dry matter loss of winter wheat in T1 and AF<sub>sto</sub>6 (a) and in T2 and AF<sub>sto</sub>6 (b).
<p>(“---”and“—” represent 95% confidence level and the overall mean confidence region, respectively).</p
The hourly variation of mean <i>f</i><sub><i>PAR</i></sub>, <i>f</i><sub><i>T</i></sub>, and <i>f</i><sub><i>VPD</i></sub> in each treatment.
<p>The hourly variation of mean <i>f</i><sub><i>PAR</i></sub>, <i>f</i><sub><i>T</i></sub>, and <i>f</i><sub><i>VPD</i></sub> in each treatment.</p
The experimental design of artificial shading and an open-top chamber.
<p>The experimental design of artificial shading and an open-top chamber.</p
The daily variation of mean <i>f</i><sub><i>phen</i></sub> and <i>f</i><sub><i>O3</i></sub> in each treatment.
<p>The daily variation of mean <i>f</i><sub><i>phen</i></sub> and <i>f</i><sub><i>O3</i></sub> in each treatment.</p
The diurnal variation of mean (x SD) PAR in each treatment (n = 68).
<p>The diurnal variation of mean (x SD) PAR in each treatment (n = 68).</p
The hourly simulated and observed mean ozone concentrations in Nanjing station from March to May of 2006.
<p>The hourly simulated and observed mean ozone concentrations in Nanjing station from March to May of 2006.</p
Simulated ozone concentrations plotted against observed ozone concentrations in Nanjing station from March to May of 2006.
<p>Simulated ozone concentrations plotted against observed ozone concentrations in Nanjing station from March to May of 2006.</p
Simulated stomatal conductance plotted against measured stomatal conductance in all treatments.
<p>(“---” and “—” represent 95% confidence level and the overall mean confidence region, respectively).</p