Archives-August 2025

Water is an essential resource for humans, animal and plant species, and an essential solvent for economic activities. To this end, a study was conducted in the Nyamukau stream in the urban area of Bunia in Ituri Province (Democratic Republic of Congo) between February and March 2024. The aim was to assess the water quality of this stream using physicochemical parameters (temperature, pH, dissolved oxygen, turbidity, salinity, and conductivity) collected in situ at various stations, including the source, the environment, and the mouth. The physicochemical characterization of these waters revealed that the temperature was 24.16±0.84 °C, the slightly alkaline pH was 7.29±0.09, the dissolved oxygen content was 8.04±0.60 mg/L, the turbidity was 13.16±0.30 NTU, the salinity was 21.14±1.55 mg/L and the conductivity was 95.38±2.88 µS/cm. The measured temperature, pH and dissolved oxygen values provide an ideal environment for the multiplication of microorganisms. Overall, the recorded physicochemical parameter values reveal that the Nyamukau waters are of poor quality compared to the standards of Rodier et al. (2009) and WHO (2000)

This study concerned the study of the diatomic flora of the Djubudjubu stream in the urban region of Kisangani (Tshopo/ DRC). Samples were taken at the source, in the middle and at the outfall of the stream. The results obtained revealed a great diversity of 119 species, 38 genera distributed in 24 families. The source contained many species (51 species) than the other stations. The Shannon and Weaver biodiversity indices revealed a great diversity. The Evenness index showed an equipartition of species. The species Pinnularia sp8 and Nitzschia palea are the most abundant (13.68 and 10.25% respectively). The specific relative abundance is very high at the source (42.69%) than at the other stations. The different groupings of species and samples depend on their environment having similar ecological conditions at the different stations.

The present work carries out a study of resistance to deformation in materials from the point of view of anisotropy, for which a stress-strain analysis in tension and compression is presented, with the purpose of determining the corresponding elastic and plastic zones. The pure copper material called High Copper C1840 is used. Likewise, the relation of the anisotropic mathematical modeling of the deformation phenomena found is presented, obtaining the constants of Hooke's law, the characterization and analysis of the stress-strain curves, elasticity limit. A Mathematical Modeling is also proposed and the values of the mathematical model for the compression and tension process are contrasted with the reality of the experimentation obtained in the laboratory.

Mycetomas are chronic, inflammatory, and often multi-fistulized pseudotumors of the skin, caused by exogenous fungi (eumycetomas) or aerobic bacteria (actinomycetes), and characterized by the production of grains. These are severe lesions, mostly seen in tropical and subtropical regions. Their management is challenging and can sometimes require radical treatment.We report the case of a 23-year-old male farmer with no known medical history, residing in Adré, a town located 1060 km from N'Djamena, the capital of Chad. He presented to the outpatient clinic with a painless swelling of the left knee evolving over four years. The patient reported a history of trauma from an acacia thorn prick. Clinical examination revealed a large, inflamed, polyfistulized knee with a “watering can” appearance. Upon pressure, multiple blackish grains of various sizes were visible to the naked eye. A diagnosis of left knee mycetoma with bone involvement was made. The patient underwent arthrotomy with sample collection and joint lavage, combined with antifungal treatment. The course was marked by recurrence, which required radical surgical intervention.This localization is particularly severe due to the near-systematic bone involvement.

Otoacoustic emissions (OAEs) are an important, non-invasive method for early hearing screening that objectively assesses cochlea characteristics. Their usage, specifically brief-evoked OAEs (TEOAEs), enables the accurate diagnosis of hearing abnormalities in infants and early children, frequently before behavioral indications appear. OAEs are fast, cost-effective, and appropriate for a variety of screening settings, including neonatal intensive care units and school programs. Introducing OAEs into infant hearing screening procedures contributes to faster prediction and management, eventually improving the developmental prospects to kids with hearing loss.

This study, entitled "Influence of Breed and Feeding on the Zoo technical Performance of Piglets (Sus domesticus erxleben, 1777) and Their Commercial Profitability," was conducted in the city of Kindu and its surrounding areas, Maniema Province, DRC. This research aimed to analyze pig farming practices in Kindu, focusing on the effects of feeding practices, piglet breed management, and their commercial profitability. This study aimed to test the hypothesis that piglets, when fed balanced rations adapted to their nutritional needs, achieve significant weight gains and growth. Those types of feed (local, balanced local, and balanced) containing 6.6% CP, 17.01% CP, and 17.09% CP, respectively, were formulated and rationed to the three pig breeds used as study material. The 46-day-old piglets were divided into three sub-groups: local breed piglets, crossbred piglets, and Large White piglets. These three groups of piglets were each rationed with the three types of feed for 9 weeks. After a week of pre-rationing followed by the actual rationing, the results show that the piglets benefit from balanced rations and gave better zoo technical performances in general except at the 2nd and 8th week (p < 0.05). The difference between the weight averages was not significant. However, feed consumption was (0.63%) and the average weekly weight gain was (0.222 g/week). In second place, the balanced local diet provided average performance. The piglets performed better on the balanced diet, with (p < 0.05) significant differences in live weight gain at weeks 5 and 8 (the difference was not significant in other weeks), feed consumption (0.71%), and average weekly weight gain (0.216 g/week).The study found that the utilization rate of balanced ration distribution was significant (p < 0.05) for different breeds of piglets that allowed for normal growth rates and rapid weight gain, followed by the balanced local ration. This study demonstrated the need to distribute feed in farms practicing late weaning at 45 days. Indeed, their judicious use in pig production can represent a significant economic benefit. However, data analysis reveals that, despite this income, financial profitability is negative for all the sires monitored during this period, indicating that the expenses incurred for the maintenance of the sires exceed the income generated. Expenses related to piglet rearing over a nine-week period. This profit is equivalent to approximately $ 21.53 per piglet. In contrast to the negative profitability of the sires, the financial profitability observed for the three piglet breeds is positive, indicating more efficient management of production costs for this category of animals. Finally, this practice supports the prospects for improving zoo technical performance in pig farming in the City of Kindu and its surrounding areas.