Dammarane-type saponins (DTSs) exist in various medicinal plants, which are a class of active ingredients with effects on improving myocardial ischemia and immunomodulation. In this study, quantitative 1H NMR method total DTSs herbal medicines was developed based the analytical procedure lifecycle. first stage (analytical design), Ishikawa diagram failure mode criticality analysis were used to ...

inorganic polyphosphates (polyp) are linear polymers of few to several hundred orthophosphate residues, linked by energy-rich phosphoanhydride bonds. four isolates had been screened from soil sample. by maldi-tof analysis, they were identified as bacillius cereus, acinetobacter towneri, b. megaterium and b. cereus. the production of polyp in four isolates was studied in phosphate uptake medium ...

The discrete element method and simulation analysis of the interaction between granular materials implements provide a convenient effective for optimal design farming machinery. However, parameter differences different make impossible to carry out directly. It is necessary obtain specific material parameters contact through calibration object, so as results more reliable. Parameter mainly inclu...

AbstractInvestigation of alkaline protease production under different fermentation conditions using one factor at a time involving temperature, pH, incubation as well carbon and organic nitrogen sources .The results showed that the maximum activity (470U/ml) was obtained peptone 7.5 (g/L), glucose 5 pH 10, 24h 35oC. Further more, Two sequential statistical designs were used to optimize these ph...

A rapid and sensitive method has been proposed for the determination of chromium and cobalt in seafood samples by flame atomic absorption spectrometry combined with a dynamic ultrasound-assisted acid extraction and an on-line minicolumn preconcentration. The use of diluted nitric acid as extractant in a continuous mode at a flow rate of 3.5 mL min(-1) and room temperature was sufficient for qua...

In this article we investigate two-level split-plot designs where the sub-plots consist of only two mirror image trials. Assuming third and higher order interactions negligible, we show that these designs divide the estimated effects into two orthogonal sub-spaces, separating sub-plot main effects and sub-plot by whole-plot interactions from the rest. Further we show how to construct split-plot...