A mail survey of 1,984 U.S. billfish tournament anglers was com­ pleted to examine their fishing activity, attitudes, trip expenditures, consumer's sur­ plus, catch levels, and manaf?ement prefer­ ences. A sample of 1,984 anglers was drawn from billfish tournamel1ls in the west­ ern Atlantic Ocean (from Maine to Texas, including Puerto Rico and the U.S. Virgin Islands) during 1989. A response r...

In the title compound, C(9)H(8)NO(+)·C(3)H(3)O(4) (-), the cation and anion are each essentially planar, with maximum deviations of 0.043 (1) and 0.060 (1) Å, respectively. The dihedral angle between these two planes is 2.20 (4)°. The conformation of the anion is stabilized by an intra-molecular O-H⋯O hydrogen bond, which forms an S(6) ring motif. The hy-droxy group of the oxine unit makes a hy...

In the title compound, C(17)H(16)O(4), the dihedral angle between the mean planes of the hy-droxy-phenyl and dimeth-oxy-phenyl rings is 5.9 (6)°. The mean plane of the prop-2-en-1-one group makes dihedral angles of 3.6 (0) and 2.6 (7)° with the hy-droxy-phenyl and dimeth-oxy-phenyl rings, respectively. An intra-molecular O-H⋯O hydrogen bond occurs. The crystal packing is stabilized by weak inte...

In the title mol-ecule, C(11)H(12)N(2)O(4), the dihedral angle between the benzene ring and imidazolidine ring is 7.1 (5)°. In the crystal structure, the hy-droxy groups are involved in the formation of inter-molecular O-H⋯O hydrogen bonds, which link the mol-ecules related by translation into C(2) chains along the b axis.

The non-H atoms of the title compound, C20H20N2O2, is located on a mirror plane except two methyl groups of the tert-butyl group. Intra-molecular N-H⋯O hydrogen bonds exist between the hy-droxy and diazenyl groups. In the crystal, mol-ecules are linked by weak C-H⋯O hydrogen bonds into supra-molecular chains running along the a-axis direction.

The electromagnetic decay processes of excited hyperon states are a very sensitive probe of the structure of hyperons. We will argue that the recent measurements of electromagnetic decay rates indicate that the wave functions of the hyperon ground states should contain sizeable components of excited quark states (configuration mixing). Flavor-SU (3) is a broken symmetry and it appears that the ...

In the title compound, C(14)H(13)NO, the two rings show significant deviation from coplanarity, with a dihedral angle between the two planes of 49.40 (5)°. The hy-droxy group is involved in an inter-molecular O-H⋯N hydrogen bond, forming an extended one-dimensional zigzag chain along (001).

In the title compound, C(27)H(26)O(4), each of the cyclo-hexenone rings adopts a half-chair conformation. The dihedral angle between the two phenyl rings is 89.53 (5)°. The hy-droxy and carbonyl O atoms face each other and are orientated to allow the formation of two intra-molecular O-H⋯O hydrogen bonds, which are typical of xanthene derivatives.

In the crystal structure of the title compound, C(21)H(24)F(2)N(2)O(2), the two N atoms of the imidazolidine moiety are linked to the hy-droxy groups by intra-molecular O-H⋯N hydrogen-bonding inter-actions. The crystal studied was a racemic mixture of RR and SS enatiomers. The cyclo-hexane ring adopts a chair conformation and the imidazolidine group to which it is fused has a twisted envelope c...

The title compound, C5H11N5O, crystallized with two independent mol-ecules in the asymmetric unit. The two mol-ecules differ in the orientation of the 2-methyl-propan-2-ol unit, with the hy-droxy H atoms pointing in opposite directions. In the crystal, mol-ecules are linked via O-H⋯O and N-H⋯O hydrogen bonds, forming ribbons propagating along [10-1]. The ribbons are linked via N-H⋯N hydrogen bo...