In tropical regions, soil acidity and low soil fertility are the most important yield-limiting factors for sustainable crop production. Using legume cover crops as mulch is an important strategy not only to protect the soil loss from erosion but also to ameliorate soil fertility. Information is limited regarding tolerances of tropical legume cover crops to acid soils. A greenhouse experiment wa...

The 351.1 nm photoelectron spectra of the N-methyl-5-pyrazolide anion and the N-methyl-5-imidazolide anion are reported. The photoelectron spectra of both isomers display extended vibrational progressions in the X2A' ground states of the corresponding radicals that are well reproduced by Franck-Condon simulations, based on the results of B3LYP/6-311++G(d,p) calculations. The electron affinities...

For an N-protic acid–base system, the set of nonlinear equations (i.e., mass action and balance laws) provides a simple analytical solution/formula for any integer N ? 1. The approach is applicable general case zwitterionic acids HNA+Z (e.g., amino acids, NTA, EDTA), which includes (i) “ordinary acids” as special (Z = 0) (ii) surface complexation. Examples are presented 1 to 6. high-N perspecti...

the acidity constants (pka) of thirty four (34) ;-substituted carboxylic acids in aqueous solution havebeen calculated using conductor-like polarizable continuum (c-pcm) solvation model. the gasphaseenergies at the density functional theory (dft-mpw1pw91) and solvation energies athartree fock (hf) are combined to estimate the pka values which are very close to the experimentalvalues where, and ...

We build a Markov partition of the Feigenbaum dynamical plane, and a system of “external rays”, which are invariant under rescaling. Applications to geometry of the Feigenbaum map are given.

Influence of the acidity iodous acid (HOIO) solution system on kinetics disproportionation reaction is examined in aqueous sulfuric (0.125 moldm-3 ). The rate constants were determined at 285, 291, 298 and 303 K based data obtained under stationary conditions. calculated increase with increasing temperature for different values iodate concentrations. average activation energy 46 kJmol-1 was cho...

Several years ago experiments by one of us pointed to a lack of correspondence between blood acidity and pulmonary ventilation, which seemed to contradict the generally accepted view that the acidity of the arterial blood controlled respiration. These experiments (1) led to the statement that “The conception that the hydrogen ion concentration of the arterial blood regulates respiration is anal...