The solvothermal synthesis and characterization of quaternary arsenic chalcogenides CsTMAsQ (TM = Hg, Cd; Q = S, Se) using Cs as a structure directing agent: from 1D anionic chains to 2D anionic layers.

Four new quaternary transition metal arsenic chalcogenide Cs-TM-As-Q compounds (TM = Hg, Cd; Q = S, Se) were synthesized using different mixed solvents. A 1,4-diaminobutane(1,4-dab)/water mixed solvent system was used to solvothermally synthesize the selenoarsenates CsTMAsSe (TM = Hg (1), Cd (2)). In 1, the eight-membered ring anion chain consists of trigonal-planar [HgSe] and trigonal-pyramid [AsSe].

A case-control study on children with Guillain-Barre syndrome in North China.

Objective: To explore the risk factors for Guillain-Barre syndrome.

Methods: Case-control study design was used in 51 cases of Guillain-Barre syndrome, and 51 matched controls. All of the 51 cases in this study had been examined by electrophysiology.