Introduction Quadratic integral equations provide an important tool for modeling the numerous problems in engineering and science. These equations appear in the modeling of radiative transfer, kinetic theory of gases, traffic theory, neutron transport and in many other phenomena [2-7]. So, it is clear that solving this class of integral equations can be used to describe many events in the real ...

The mol-ecule of the title Schiff base compound, C(28)H(32)N(2)O(2), has a twisted geometry, the dihedral angles between the central benzene ring and the other two benzene rings being 29.12 (14) and 26.01 (14)°. Four intra-molecular C-H⋯O hydrogen bonds and two intra-molecular O-H⋯N hydrogen bonds stabilize the mol-ecular structure. In the crystal packing, mol-ecules are stacked along the a axi...

The title compound, C(12)H(13)ClN(2)O(2), crystallizes with two independent but very similar mol-ecules (A and B) in the asymmetric unit. The pyrazole ring in each mol-ecule has an envelope conformation. The dihedral angle between the pyrazole ring mean plane and the benzene ring is 86.07 (14)° in A and 85.99 (14)° in B. In the crystal, the A and B mol-ecules are linked via a pair of O-H⋯O hydr...

The title compound, C(14)H(14)N(4)S(2), was obtained from a condensation reaction of benzyl dithio-carbazate and acetyl-pyrazine. The asymmetric unit contains two independent mol-ecules, in each of which the pyrazine ring and dithio-carbazate unit are approximately co-planar, the r.m.s. deviations being 0.0304 and 0.0418 Å. The mean plane is oriented with respect to the benzene ring at 49.22 (4...

In the mol-ecule of the title compound, C(14)H(14)ClNO(2)S, the N-H bond is in a syn position with respect to the meta-Cl atom in the aniline ring. The mol-ecule is twisted about the N-S bond with a C-SO(2)-NH-C torsion angle of 44.55 (17)°. The two aromatic rings are inclined relative to each other by 66.2 (1)°. In the crystal, N-H⋯O hydrogen bonds link the mol-ecules into infinite chains para...

Correspondence Qualitative differences in faecal alpha-1-antitrypsin in patients with Crohn's disease SIR,-The use of faecal alpha-1-antitrypsin (A-1-AT) in the assessment of Crohn's disease (CD) activity remains controversial. In a recent study Fischbach et al found no correlation of faecal A-1-AT with ESR, serum albumin, orosomucoid, activity index of Van Hees, or CDAI.' Conversely, faecal A-...

The asymmetric unit of the title compound, [Sn(CH(3))(2)Cl(2)(C(14)H(14)N(2))], contains two crystallographically independent mol-ecules. In each mol-ecule, the Sn(IV) atom is six-coordinated in a distorted octa-hedral geometry by one bidentate 2,4-di-methyl-N-(pyridin-2-yl-methyl-idene)aniline ligand, two methyl groups and two Cl atoms. In the crystal, inter-molecular C-H⋯Cl hydrogen bonds lin...

The asymmetric unit of the title compound, C(17)H(10)ClF(2)N(3)O, contains three independent mol-ecules. In each mol-ecule, the C=C bond has a cis conformation with respect to the triazole and chloro-phenyl groups. The dihedral angles formed by the triazole ring with the diflurophenyl and chloro-phenyl benzene rings, respectively, are 20.10 (14) and 73.22 (15), 25.31 (15) and 84.44 (15), and 16...

The asymmetric unit of the title compound, C(14)H(14)F(4)N(2)O(4)·H(2)O, contains two crystallographically independent organic mol-ecules and two water mol-ecules. The two 1,3-diazinane rings adopt a half-chair conformation and the dihedral angles between their mean planes and those of the benzene rings are 75.65 (4)° and 49.41 (3)° in the two mol-ecules. The crystal structure is stabilized by ...

Background & Aim: Ocimum basilicum L. is belong to the Lamiaceae family which is cultivated as a culinary, industrial and medicinal plants in some countries from thousands years ago. The seed of this plant is rich in poly un-saturated fatty acids (PUFA) and produced a large amount of mucilage. Experimental: The oil of seed was extracted separately and converted to fatty acids...