[Enhancement of plantlet regenerative efficiency of watermelon in vitro].

The purpose of this study was to enhance shoot regenerative efficiency of watermelon by optimizing culture parameters. Cotyledons at 4-day seedlings were explanted and cultured on MS medium supplemented with different combinations of hormones. In "Yixuan" cultivar, the plantlet regenerative frequency and shoots produced by per explant was as low as 10% and 0.

[Continuous in situ monitoring of the dissolution rate of solid pharmaceutical preparations using a multiple channel fiber-optic chemical sensor].

Aim: To study the dissolution rate of solid pharmaceutical preparation on-line, a multiple channel fiber-optic chemical sensor based on fluorescence multiple quenching (FOCSMQ) without filtering and sampling was made.

Methods: Using the multiple channel FOCSMQ linked with computer, the dissolution rates of ofloxacin tablets, metronidazole tablets and nitrofurantoin tablets were monitored continuously on-line. The instrument can give the sample data, display the real time curve and calculate the T1/2 and td automatically.