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The diatomite was used as the main material, diatomite-based porous ceramics were prepared. On the surface of diatomite-based porous ceramics, through dipping glaze composed by diatomite, tourmaline and sintering additives, tourmaline modification diatomite-based interior wall material was prepared. The formaldehyde removal effect was discussed. The results indicated that the main crystalline phases of tourmaline modification diatomite-based interior wall material were quartz and corresponding tourmaline phase. The material had larger specific surface area and abundant pores. The environmental performance of tourmaline in the glaze was preserved. The concentration of formaldehyde droped from 0. 312 mg/m³ to 0. 089 mg/m³ in 1 m³ environmental chamber in 360 min, and the formaldehyde removal rate was 71. 4%, indicating that the material had good adsorption and removal effects on formaldehyde in indoor air. [ABSTRACT FROM AUTHOR]

Objective: To explore the best time of intratympanic dexamethasone injection to treat sudden sensorineural hearing loss (SSNHL) as salvage therapy so that to improve the curative efficacy on sudden deafness at the utmost., Method: A total of 192 patients with SSNHL were included in this study, among whom 63 cases received the systemic steroid therapy throughout the study, while the other ones were treated with systemic steroid as initial treatment and were given intratympanic steroid administration as salvage treatment starting at different time point. The salvage treatment started on the 3rd day after the beginning of the initial treatment for 29 cases, on the 7th day for 38 cases, on the 14th day for 43 cases, and 1 month later for 19 cases. All the patients were followed up for 2 months., Result: The recovery rates and total effective rates showed no statistically significant difference between the patients received only systemic steroid therapy and the ones received intratympanic steroid administration on the 3rd, 7th day and 1 month later after the initial treatment. The recovery rate and total effective rate exhibited statistically significant difference between the patients received intratympanic steroid administration since the 14th day after the initial treatment and the ones received only systemic steroid therapy, with the numerical value of P 0. 037 and 0. 034, respectively., Conclusion: (1) As an initial management plan, the curative effects. between the intratympanic steroid administration and the systemic steroid therapy were not significantly different. (2) As a salvage treatment, intratympanic steroid was a better choice for patients who have not completely recover from ISSNHL after failure of initial management with systemic steroid only. (3) The best time point of salvage treatment with intratympanic steroid was about 2 weeks after initial management with systemic steroid.