The pH titration behavior of E . coli rRNA in the acid range has been analyzed by combining spectrophotometric and potentiometric titration data. The “simplest” model for the system, which considers as possible reactions the protonation of adenine (A), cytosine (C), and guanine (G) residues along with the opening of A-U and G . C base pairs, does not adequately account for the titration propert...

DNA double helices comprising two neighbouring artificial imidazole-Ag(I)-imidazole base pairs incorporate the Ag(I) ions in a cooperative fashion. Isothermal titration calorimetry data confirm the theoretically predicted binding stoichiometry and indicate that Ag(I) binds with association constants >10(6) M(-1) to the metal-free DNA duplex.

An AISI 304 stainless steel laminar electrode without oxidative treatment was investigated for the potentiometric titration of hydrochloric acid with sodium hydroxide. The proposed obtained from metalworking cuttings. Scanning electron microscopy, energy dispersive X-ray spectroscopy, fluorescence spectroscopy and diffraction were used to study surface morphology chemical composition electrode....

AquaEnv (Hofmann et al. 2010b) is an integrated development toolbox for aquatic chemical model generation focused on (ocean) acidification and CO2 air-water exchange. It contains ❼ All elements necessary to model the pH, the related CO2 air-water exchange, as well as aquatic acid-base chemistry in general for an arbitrary marine, estuarine or freshwater system. ❼ A suite of tools to visualize t...

The Boehm titration, originally developed to characterize carbon blacks and activated carbons, has earned growing attention as a method for characterization of acid and base properties of biochar (Boehm, 1994; Goertzen et al., 2010). The method is based on the principle that strong acids and bases will react with all bases and acids, respectively, whereas the conjugate bases of weak acids will ...

A direct potentiometric titration method was applied for determination of Ranitidine Hydrochloride. The method is based on the treatment of the primary data with nonlinear regression procedure using commercial software. A general formula valid for every type of acid base titration, derived before is used as a direct input. The acid-base constants of N, N dimethyl-5 [2-(1-methylamine-2-nitroviny...

Determining the surface protonation behavior of natural adsorbents is essential to understand how they interact with their environments. ProtoFit is a tool for analysis of acid–base titration data and optimization of surface protonation models. The program offers a number of useful features including: (1) enables visualization of adsorbent buffering behavior; (2) uses an optimization approach i...