1. Experiments were undertakn on strips of human atrial and ventricular muscle, on right ventricular rabbit papillary muscles and on the rabbit interventricular septum. 2. In all preparations an increase of developed tension after 30 min exposure to ouabain was apparent only at or above a concentration of 10(-7) mol/l (73 micrograms/l). 3. In the rabbit septum there was a net loss of potassium ...

The asymmetric unit of the title compound, C(23)H(28)N(3)OP, contains two independent mol-ecules with significant conformational differences. For example, the torsion angles N-C-C-C involving the N-benzyl moieties are 57.3 (7) and 11.6 (8)° in one mol-ecule and 76.5 (7) and 97.4 (7)° in the other. In each mol-ecule, the P atom exhibits a distorted tetra-hedral conformation [the bond angles at P...

The asymmetric unit of the title compound, K(I) (4)[Mo(III)(CN)(7)]·2H(2)O, consists of one [Mo(CN)(7)](4-) anion, four K(+) cations, and two water mol-ecules. The [Mo(III)(CN)(7)](4-) anion has a seven-coordinated capped-trigonal-prismatic coordination geometry. The site-occupancy factors of the disordered water mol-ecules were set at 0.90, 0.60 and 0.50. The H-atom positions could not be dete...

The asymmetric unit of the title compound, C(9)H(4)S(7), contains two independent mol-ecules, in one of which the central five-membered ring is disordered over two orientations in a 0.924 (3):0.076 (3) ratio. The mol-ecular skeleton is almost planar: the average distance of the atoms from their mean plane is 0.128 (7) Å in the ordered mol-ecule, and 0.088 (5) and 0.123 (2) Å in the major and mi...

The asymmetric unit of the title compound, C(14)H(6)Cl(6)N(2), contains two crystallographically independent mol-ecules, each of which is slightly twisted from planarity. The dihedral angles between the central ring and the two outer rings are 3.81 (7) and 4.30 (7)° in one mol-ecule, and 4.13 (8) and 4.10 (7)° in the other. In the crystal structure, mol-ecules are inter-linked by C-Cl⋯Cl inter-...

A new optical fiber sensor for tetracycline is fabricated with an anthracene-containing copolymer prepared from 9-anthrylmethyl methacrylate, methyl methacrylate and n-butyl acrylate (PAMB). The sensing relies on the fact that the fluorescence of the sensor membrane fabricated with PAMB can be strongly quenched by the tetracycline antibiotics extracted from the sample. The proposed sensor respo...

OBJECTIVES Cefixime (Cfx), is a semi-synthetic third-generation oral cephalosporin antibiotic that is prescribed for the treatment of susceptible infections. There are some procedures for the determination of Cfx in pharmaceutical formulations and biological samples. Herein a spectrofluorimetric method was proposed for Cfx determination based on the fluorescence quenching of terbium-danofloxaci...