introduction: the purpose of this study was to investigate root surface ph changes over a period of 4 weeks following treatment with calcium-hydroxide dressing of intact and resorbed roots. materials & methods: the canals of 30 single-rooted teeth were instrumented with protaper rotary files and randomly divided into 2 experimental groups of 14 each, and one control group with two samples. to s...

-The hydroxyl deformation modes of kaolins have been studied by Fourier transform (FT) Raman spectroscopy. Kaolinites showed well-resolved bands at 959, 938 and 915 cm 1 and an additional band at 923 cm ~. For dickites, well-resolved bands were observed at 955, 936.5, 915 and 903 cm I. Halloysites showed less-resolved Raman bands at 950, 938, 923, 913 and 895 cm 1. The first 3 bands were assign...

The reaction between hydrogen peroxide and ferrous EDTA generates an oxidizing intermediate (I1) which is not the hydroxyl radical. It oxidizes ferrocytochrome c and also reacts with hydrogen peroxide (k5 = 3.2 X 10(3) M-1 S-1) to form a second oxidizing transient (I2). I1 is not scavenged by t-butyl alcohol whereas I2 is. I1 is found to be significantly less reactive than the hydroxyl radical ...

Current lithium batteries operate on inorganic insertion compounds to power a diverse range of applications, but recently there is a surging demand to develop environmentally friendly green electrode materials. To develop sustainable and eco-friendly lithium ion batteries, we report reversible lithium ion storage properties of a naturally occurring and abundant organic compound purpurin, which ...

The secondary hydroxyl ion (alkoxide) ion for cyclodextrin (CD) may affect the decomposition of allyl isothiocyanate (AITC) in alkaline solutions. The equilibrium and kinetic parameters involved in the reaction processes were measured. It was found that the interaction between the alkoxide ion for CD and the included AITC occurred more than pKa 12.7. From the identified kinetic parameters and d...