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

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

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

High sensitivity refractive index sensing using zone plate metasurfaces with a conical phase profile

In this paper, we showed how a bulky Axicon lens can be transformed to a compact binary zone plate with conical phase profile. We built three zone plates made of three different materials and designed each zone plate to be used in high sensitivity refractive index sensing. This work is complementary to another work we have done before in which we showed mathematically how maximum sensitivity can be achieved in case of using an Axicon lens in sensing. The zone plates are designed to generate a Bessel–Gauss beam at the wavelength of 3.3 microns at which the absorption of methane gas is maximum leading to a maximum change in the refractive index. The generated intensity in the output is very sensitive to any slight change in the refractive index of the surrounding medium. Therefore, if an optical detector is positioned at the point of maximum change in the intensity with refractive index, we can easily measure the change in refractive index and hence the percentage of the gas with very high sensitivity

Differential Optical Spectrometer based on Critical Angle Dispersion

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