First Principles Study of the Photoelectric Properties of Alkaline Earth Metal (Be/Mg/Ca/Sr/Ba)-Doped Monolayers of MoS2.

The energy band structure, density of states, and optical properties of monolayers of MoS2 doped with alkaline earth metals (Be/Mg/Ca/Sr/Ba) are systematically studied based on first principles. The results indicate that all the doped systems have a great potential to be formed and structurally stable. In comparison to monolayer MoS2, doping alkaline earth metals results in lattice distortions in the doped system. Therefore, the recombination of photogenerated hole-electron pairs is suppressed effectively. Simultaneously, the introduction of dopants reduces the band gap of the systems while creating impurity levels. Hence, the likelihood of electron transfer from the valence to the conduction band is enhanced, which means a reduction in the energy required for such a transfer. Moreover, doping monolayer MoS2 with alkaline earth metals increases the static dielectric constant and enhances its polarizability. Notably, the Sr-MoS2 system exhibits the highest value of static permittivity, demonstrating the strongest polarization capability. The doped systems exhibit a red-shifted absorption spectrum in the low-energy region. Consequently, the Be/Mg/Ca-MoS2 systems demonstrate superior visible absorption properties and a favorable band gap, indicating their potential as photo-catalysts for water splitting.

[The efficacy of treatment of oral and maxillofacial venous malformations by pingyangmycin injection with different concentrations].

PURPOSE: To evaluate the clinical effect of using different concentrations of pingyangmycin to treat venous malformations in oral and maxillofacial region. METHODS: One hundred and ninety-four patients with venous malformations in oral and maxillofacial region were included and treated by pingyangmycin injection with different concentrations. For superficial cutaneous venous malformations, the concentration of pingyangmycin was 8mg/mL while 8mg/5mL for venous malformations limited to oral mucosa or submucosa. RESULTS: The efficient of cutaneous venous malformations was 94.9%,while 100% for oral mucosal and submucosa. CONCLUSIONS: Using different concentrations of pingyangmycin for venous malformations in different sites can get good results and reduce unnecessary complications.

[Intralesional pingyangmycin injection in the management of macrocystic lymphatic malformations in cervical region].

PURPOSE: To investigate the therapeutic effects of pingyangmycin injection as a primary therapy of macrocystic lymphatic malformations in cervical region. METHODS: Thirty-six patients with macrocystic lymphatic malformations in cervical region underwent the therapy of pingyangmycin injection between 2009 and 2012 at School of Stomatology, China Medical University. Among them, 16 patients had unilateral submandibular lesions, 20 patients had lesions in anterior cervical regions. The age of patients was from 6 months to 25 years old. The concentration of the drug was 1.6 mg /mL with an addition of lidocaine. The dose and cycle of treatment were dependent on the lesions' size and patients' age. The follow-up period was 12 months to 2 years after the last treatment. RESULTS: The total effective rate was 100%, and the curative rate was 94.4%. No serious complications were encountered. CONCLUSIONS: Intralesional Injection of pingyangmycin provides a safe and effective treatment for macrocystic lymphatic malformations in cervical region as a primary treatment.