Performance of RSMA-Based UOWC Systems Over Oceanic Turbulence Channel With Pointing Errors

Underwater optical wireless communication (UOWC) systems face significant challenges due to oceanic turbulence and pointing errors (PE), which can degrade system performance. Moreover, interference is another challenge in UOWC, considering the consistent increase in underwater optical devices. In this study, the performance of rate splitting multiple access (RSMA)-based UOWC systems is investigated over an exponential-generalized gamma (EGG)-distributed oceanic turbulence channel with generalized PE. The RSMA scheme is employed to facilitate communication between a source and multiple users in the UOWC system while accounting for the combined effects of oceanic turbulence and generalized PE. The statistical characterization of the UOWC system is analyzed, including the probability density function (PDF) of the signal-to-noise ratio (SNR), outage probability, throughput, and sum ergodic capacity. Additionally, closed-form expressions for the outage probability and throughput are derived, and asymptotic expressions for the outage probability in the high SNR regime are provided. Moreover, the diversity order of the system is evaluated, and the impact of different parameters on the system performance is discussed. Our results demonstrate the effectiveness of the RSMA-based UOWC system in mitigating the adverse effects of oceanic turbulence and PE while achieving improved performance in terms of capacity and outage probability. The findings of this study provide valuable insights for the design and optimization of UOWC systems in challenging underwater environments

La tumeur épithéliale odontogénique calcifiée : à propos d'un cas

Les tumeurs odontogéniques à composante minéralisée sont multiples. Parmi ces tumeurs, on trouve la tumeur épithéliale odontogénique calcifiée ou tumeur de Pindborg. Cette tumeur est rare. Son diagnostic est orienté par la radiologie, mais est difficile avant l'apparition des calcifications. A ce stade, le diagnostic différentiel se pose surtout avec le kyste épidermoïde ou l'améloblastome. Après l'apparition des calcifications, le diagnostic devient plus aisé, surtout si on a recours à la tomodensitométrie qui permet une excellente étude des différentes densités de la matrice tumorale. (Med Buccale Chir Buccale 2002; 8: 87-90)

First insights into the microbiome of Tunisian Hyalomma ticks gained through next-generation sequencing with a special focus on H. scupense.

Ticks are one of the most important vectors of several pathogens affecting humans and animals. In addition to pathogens, ticks carry diverse microbiota of symbiotic and commensal microorganisms. In this study, we have investigated the first Tunisian insight into the microbial composition of the most dominant Hyalomma species infesting Tunisian cattle and explored the relative contribution of tick sex, life stage, and species to the diversity, richness and bacterial species of tick microbiome. In this regard, next generation sequencing for the 16S rRNA (V3-V4 region) of tick bacterial microbiota and metagenomic analysis were established. The analysis of the bacterial diversity reveals that H. marginatum and H. excavatum have greater diversity than H. scupense. Furthermore, microbial diversity and composition vary according to the tick's life stage and sex in the specific case of H. scupense. The endosymbionts Francisella, Midichloria mitochondrii, and Rickettsia were shown to be the most prevalent in Hyalomma spp. Rickettsia, Francisella, Ehrlichia, and Erwinia are the most common zoonotic bacteria found in Hyalomma ticks. Accordingly, Hyalomma ticks could represent potential vectors for these zoonotic bacterial agents

Pre-emptive treatment of Hepatitis B infection by lamivudine in two tunisian renal transplant recipients

Infection with hepatitis B virus has a major implication for transplant recipients due to the risk of reactivation under immunosuppression, progression to chronic liver disease, development of liver cirrhosis and hepatocellular carcinoma. We report two cases of renal transplantation patients who were hepatitis B surface antigen positive before transplantation and were treated by Lamivudine

Differentiation of Fanconi anemia and aplastic anemia using mitomycin C test in Tunisia

International audienceFanconi anemia (FA) is a recessive chromosomal instability syndrome that is clinically characterized by multiple symptoms. Chromosome breakage hypersensitivity to alkylating agents is the gold standard test for FA diagnosis. In this study, we provide a detailed laboratory protocol for accurate assessment of FA diagnosis based on mitomycin C (MMC) test. Induced chromosomal breakage study was successful in 171 out of 205 aplastic anemia (AA) patients. According to the sensitivity of MMC at 50 ng/ml, 38 patients (22.22%) were diagnosed as affected and 132 patients (77.17%) as unaffected. Somatic mosaicism was suspected in an 11-year-old patient with a FA phenotype. Twenty-six siblings of FA patients were also evaluated and five of them (19.23%) were diagnosed as FA. From this study, a standard protocol for diagnosis of FA was developed. It is routinely used as a diagnostic test of FA in Tunisia