4-(4-Chloro-phen-yl)-3-cyano-7-(4-meth-oxy-phen-yl)-5-oxo-5,6,7,8-tetra-hydro-4H-chromen-2-aminium methano-late.

In the cation of the title organic ion pair compound, C(23)H(20)ClN(2)O(3) (+)·CH(3)O(-), the cyclo-hexyl ring shows a half-boat conformation and the dihedral angles between two benzene rings and the pyran ring are 83.14 (7) and 73.18 (9)°.

(4R,7S)-2-Amino-4-(3,4-dimeth-oxy-phen-yl)-5-oxo-7-phenyl-5,6,7,8-tetra-hydro-4H-chromene-3-carbonitrile monohydrate.

The title compound, C(24)H(22)N(2)O(4)·H(2)O, was obtained by the reaction of 3,4-dimeth-oxy-benzaldehyde, malononitrile and 5-phenyl-cyclo-hexane-1,3-dione. The cyclo-hexyl and pyran rings show half-boat and V-shaped conformations, respectively. The dihedral angle between the phenyl and benzene ring planes is 30.

[Matched case-control study for risk factors of human Streptococcus suis infection in Sichuan Province, China].

Objective: To study the potential risk factors of human infecting with Streptococcus suis.

Methods: 1: M matched case-control study was conducted. 29 human cases of Streptococcus suis infection in the early phase were included in the case group, Patients' family members, neighbors and peoples who had worked together with patients to handle deceased or sick pigs in the last week were recruited as matched controls.

[Anlysis on features of dead cases with human Streptococcus suis infections].

Objective: To describe the clinical and epidemiological features of dead cases with human Streptococcus suis infections, and to find the target population for preventing death and the related indicators.

Methods: Epidemiological investigation on human Streptococcus suis infections was implemented used unified questionnaires. Analysis on dead cases and survival cases (as contrast) was done.

[Clinical study on two internal fixation methods Kaneda and Z-plate in the operation of anterior surgical approach after thoracolumbar fractures].

Objective: To study the difference between two internal fixation methods Kaneda and Z-plate in the operation of anterior surgical approach and decompression after thoracolumbar fractures.

Methods: The bio-mechanical structure of the internal fixture, install when operating, complications and time of the operation were compared in the cases by Kaneda and Z-plate.

Results: Z-plate method had the following characteristics: reasonable of the bio-mechanical structure; stability after internal fixture being installed; capability of completely propping up the injured centrum and keeping the height of middle-column; simple operation when installing internal fixture and shorter time of operation (1.