For studying the morphology of bacteria in fixed smears, Knaysi (J. Bact., 49, 375) demonstrated the value of staining by a method showing the cell wall. Knaysi (J. Bact., 41, 141) developed a tannin alum fuchsin method which stains differentially the cytoplasm, cell wall, and capsule. It is the purpose of this note to report another cell wall stain in which the cell wall is positively charged ...

The hydro-chloride salt of isonicotinamide, C6H7N2O(+)·Cl(-), has been synthesized from a dilute solution of hydro-chloric acid in aceto-nitrile. The compound displays monoclinic symmetry (space group C2/c) at 150 K, similar to the related hydro-chloride salt of nicotinamide. The asymmetric unit contains one protonated isonicotinamide mol-ecule and a chloride anion. An array of hydrogen-bonding...

In the course of studies on hybrid antibacterials incorporating 2-aryl-5-nitro-1H-indole moieties as potential bacterial NorA efflux pump inhibitors, the compound 1-[2-(5-nitro-1H-indol-2-yl)phenyl]methylpyridinium chloride (2) was synthesized and structurally characterized. This pyridinium chloride salt crystallized in the monoclinic space group P2(1)/c with the following unit cell dimensions:...

Simultaneous spectrophotometric determination of Mn, Zn and Co was studied by two methods, classical partial least-squares (PLS) and kernel partial least-squares (KPLS), with 2-(5-bromo-2- pyridylazo)-5-diethylaminephenol (5-Br-PADAP) and cetyl pyridinium bromide (CPB). Two programs, SPGRPLS and SPGRKPLS, were designed to perform the calculations. Eight error functions were calculated for deduc...

Abstract Mesoporous silica was prepared using sodium silicate as a precursor and Cetyl Trimethylammonium Bromide (CTAB) templating agent. The adsorption ability of enhanced by DMA (dimethylamine) modifier glycidoxypropyltrimethoxysilane (GPTMS) linking compound. process carried out incorporating the chloride solution into DMA-modified mesoporous silica, followed desorption flowing acid solution...

In the cation of the title compound, C(12)H(10)F(2)N(3)O(+)·Cl(-), the dihedral angle between the pyridine and benzene rings is 16.1 (1)°. In the crystal structure, mol-ecules linked into two-dimensional sheets parallel to the bc plane by inter-molecular N-H⋯Cl, C-H⋯Cl and C-H⋯F hydrogen bonds.

In the cation of the title compound, C(6)H(6)N(5) (+)·Cl(-), the tetra-zole and pyridine rings are nearly coplanar, making a dihedral angle of 5.58 (11)°. The organic cations are linked to the chloride anions via N-H⋯Cl hydrogen bonds, forming chains along [110].

In the title compound, (C(5)H(6)N)(3)[MoCl(4)O(2)]Cl, the pyridinium cations are N-H⋯Cl hydrogen bonded to the anionic [MoCl(4)O(2)](2-) complexes and to the two crystallographically independent chloride anions (located on C2 axes). The Mo(6+) centre adopts a highly distorted octa-hedral geometry, being surrounded by four chloride and two terminal oxide groups. The oxide ligands are mutually cis.

The cation of the title compound, C(6)H(8)NO(2) (+)·Cl(-), is essentially planar (r.m.s. deviation = 0.0104 Å). Intermolecular O-H⋯Cl and N-H⋯Cl hydrogen bonds, as well as C-H⋯O contacts, connect the mol-ecules in the crystal structure. A short C⋯C distance of only 3.3930 (19) Å between C atoms of neighbouring rings is indicative of π-stacking. The corresponding centroid-centroid distance betwe...