Chemical constituents from shoots of Phyllostachys edulis (I) / 中草药

Objective: To investigate the chemical constituents from the shoots of Phyllostachys edulis. Methods: Compounds were isolated by using a combination of various chromatographic techniques including silica gel, ODS, Sephadex LH-20, reversed-phase HPLC, and others. And the structures were elucidated by the nuclear magnetic resonance (NMR), mass spectrometry, and other modern spectroscopy. Results: Eighteen compounds were isolated from the shoots of P. edulis and identified as thymidine (1), uracil (2), 5-ethyluracil (3), 4-hydroxy-3-methoxybenzoic acid (4), p-hydroxy-benzaldehyde (5), adenosine (6), uridine (7), 2'-O-methyluridine (8), ethyl-p-hydroxybenzoate (9), cyclo (L-Val-L-Ala) (10), cyclo (L-Phe-L-Leu) (11), flazine (12), ethyl 4-(sulfooxy) benzoate (13), 1H-indole-3-carboxylic acid, methyl ester (14), cis-p-hydroxyl ethyl cinnamate (15), trans-p-hydroxyl ethyl cinnamate (16), 4-hydroxy-2-methoxy-benzaldehyde (17), and methyl p-hydroxy benzeneacetate (18). Conclusion: All the compounds are isolated from the shoots of P. edulis for the first time, and compounds 6-18 are firstly obtained from the plants of Phyllostachys Sieb. et Zucc.

Experimental investigation of shear bond strength on orthodontic bonding on dental fluorosis after air abrading surface preparation technique / 华西口腔医学杂志

<p><b>OBJECTIVE</b>To find a way to having higher bond strength on mottled enamel.</p><p><b>METHODS</b>Sixty mottled enamel first bicuspid teeth extracted from fifteen patients needing orthodontic force were prepared and divided into four groups. Group A was routine acid etched, group B was air abraded, group C was etched by clearfil liner self-etching primer, group D was air abraded and then etched by clearfil liner self-etching primer. Next the bond and resin were used. The shear bond strength was observed and compared. The data were analysed by SPSS 11.5 statistical package.</p><p><b>RESULTS</b>The shear bonding strength of group A was (2.247 +/- 0.261) MPa, group B was (5.374 +/- 0.469) MPa, group C was (4.345 +/- 0.401) MPa, group D was (5.791 +/- 0.636) MPa. The strengths of four groups were significantly different (P < 0.01). The adhesive remnant index (ARI) scores of the four groups had no significant difference.</p><p><b>CONCLUSION</b>In clinic, using air abrasion surface preparation technique is an acceptable way to enhancing the shear bond strength before sticking the orthodontic bonding on dental fluorosis.</p>