Formulation and Characterization of Thymoquinone Bioadhesive Gel for Treatment of Chronic Gum Inflammation

The aim of study is to formulate Thymoquinone gel and investigate its effect in chronic periodontitis in terms of clinical periodontal parameters, anti-oxidant capacity and the levels of IL-1β in gingival crevicular fluid. different gelling agents (carbopol, hydroxyl propyl methyl cellulose and chitosan) were used for the development of TQ gel. The optimized gel formulation was used for the clinical study. The study was conducted on 68 subjects (25-58 years old). 48 patients were clinically diagnosed with moderate to severe chronic periodontitis. Patients were divided into three groups; Group I (24 patients): received non-surgical periodontal therapy and Thymoquinone-chitosan gel (0.1 % w/w), Group II (24 patients): received only non-surgical periodontal therapy and Group III: 20 healthy subjects (control group). All patients were evaluated for clinical parameters including plaque index (PI), gingival index (GI), probing depth (PD) and clinical attachment level (CAL).  The levels of IL-1β and total anti-oxidant capacity were recorded in gingival crevicular fluid at baseline (prior to treatment) and at weeks 4 and 12 after treatment. The results showed that combination of non-surgical periodontal therapy and Thmoquinone gel (group I)  exhibited statistically significant improvement in biochemical parameters compared to non-surgical periodontal therapy alone (group II). In conclusion we can say that the adjunctive use of thymoquinone gel with non-surgical periodontal therapy improves the biochemical parameters accompanied with chronic periodontitits significantly after 4 weeks only

An electrooptic switching structure on III-V semiconductors using the coherent coupling of radiation modes

In this paper we propose a new structure for electrooptic switching using the coherent coupling of radiation modes. The proposed structure is studied using both the non-modal Beam Propagation Method (BPM) and a modal technique based on the analysis of the radiation mode spectrum generated at each optical discontinuity in the structure. The analysis shows that the proposed structure may have a distinction ratio of 12 dB with radiation losses in the order of 3.5 dB in the ON state.Dans cet article nous proposons une nouvelle structure pour la commutation électrooptique utilisant le couplage cohérent des modes rayonnés. La structure proposée est étudiée en utilisant à la fois l'analyse non modale BPM (Beam Propagation Method) et une technique modale basée sur l'analyse du spectre des modes rayonnés générés à chaque discontinuité optique. Cette analyse montre que la structure proposée a un taux de distinction de 12 dB et des pertes de l'ordre de 3,5 dB dans l'état ON

Multilevel asymmetric coupler MAC polarization beam splitter for Si photonics technology

In this work, we present a new design of an integrated optical polarization beam splitter using the Multilevel Asymmetric Coupler MAC structure. The proposed structure is using CMOS compatible Si/SiO2 technology. The structure is tested using the Finite Difference Time Domain FDTD technique and showed a very good performance. The compromise between the structure footprint on Si and its performance is also investigated. The structure can offer an Extinction Ratio ER greater than 40 dB with a length of 5 µm. It can also be designed with a smaller length of only 2 µm but in this case its ER will be only 20 dB. It has a bandwidth of about 60 nm in which the insertion loss is less than 0.003 dB for the TE wave and less than 0.2 dB for the TM wave

Refractive index change in porous silicon after detaching from the substrate

[abstract not available

Fabrication of optical filters using multilayered porous silicon

[abstract not available

Fabrication of optical filters using multilayered porous silicon

[abstract not available

In-Plane Optical Beam Collimation Using a Three-Dimensional Curved MEMS Mirror

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High sensitivity refractive index sensing using an axicon lens structure

[abstract not available