The asymmetric unit of the title compound, C(5)H(7)N(5) (2+)·2C(7)H(7)O(3)S(-)·H(2)O, consists of one diprotonated adeninium cation, two p-toluene-sulfonic acid anions and one water mol-ecule. In the crystal, the cations and anions are connected through N-H⋯O hydrogen bonds forming R(2) (2)(8) and R(2) (2)(9) graph-set motifs. The solvent water mol-ecule links cations and anions through O-H⋯O a...

The reaction of silver nitrate with 5-chloro-2-hy-droxy-benzene-sulfonic acid in the presence of ammonia yielded the title salt, (NH(4))[Ag(NH(3))(2)](C(6)H(4)ClO(4)S)(2)·3H(2)O. The Ag(I) ion shows linear coordination [N-Ag-N = 175.2 (1) °]. The ammonium and diamminesilver cations, the benzene-sulfonate anion and the lattice water mol-ecules inter-act through an intricate network of N-H⋯O and ...

A simple, rapid and inexpensive monoparameter flow-through sensor has been developed for the determination of saccharin in low calorie and dietary products. The method is based on the transient adsorption of the sweetener on Sephadex G-25 solid phase packed to a height of 20 mm in the flow cell. The optimal transient retention of the synthetic sweetener, in terms of sensitivity and sampling fre...

Background Intimate partner violence (IPV) violates women's human rights and is a serious public health concern. Historically strategies to prevent IPV have focussed on individuals and their relationships without addressing the context under which IPV occurs. Primary prevention of IPV is a relatively new focus of international efforts and what SASA!, a phased community mobilisation intervention...

The commensal bacteria Lactobacillus are widely used as probiotic organisms conferring a heath benefit on the host. They have been implicated in promoting gut health via the stimulation of host immunity and anti-inflammatory responses, as well as protecting the intestinalmucosa against pathogen invasion. Lactobacilli grow by fermenting sugars and starches and produce lactic acid as their primar...

a simple and rapid spectrophotometric method for the determination of nitrite in water and soil preparation samples has been developed. determination of nitrite is based on diazotization of p-nitro aniline with nitrite and subsequent coupling with 4-amino-3-hydroxynaphthalene-1-sulfonic acid in hydrochloric acid. the factors affecting the reaction i.e. concentration of p-nitro aniline, concentr...

Continuum electrostatics methods have become increasingly popular due to their ability to provide approximate descriptions of solvation energies and forces without expensive sampling required by explicit solvent models. In particular, the Poisson-Boltzmann equation (PBE) provides electrostatic potentials, solvation energies, and forces by modeling the solvent as a featureless, dielectric materi...

The structure of 8-amino-2-naphthalene-sulfonic acid monohydrate (1,7-Cleve's acid hydrate), C(10)H(9)NO(3)S·H(2)O, shows the presence of a sulfonate-aminium group zwitterion, both groups and the water mol-ecule of solvation giving cyclic R(3) (3)(8) O-H⋯O and N-H⋯O inter-molecular hydrogen-bonding inter-actions, forming chains which extend down the a axis of the unit cell. Additional periphera...

In the title mol-ecular salt, C12H12N2 (2+)·2C7H5O5S(-), the complete dication is generated by crystallographic inversion symmetry. In the anion, the sulfonic acid group is deprotonated and the dihedral angle between the planes of the carb-oxy-lic acid group and the benzene ring is 12.41 (11)°. In the crystal, the anions are linked into inversion dimers by pairs of O-H⋯O hydrogen bonds, which g...