Ponle Bashirat Ayomide, Zoology - Bayero University, Kano, 2025

The study was conducted at the Department of Biological Science Bayero University Kano laboratory which was aimed at studying the effect of Citrus sinensis peel extract on larvae and adult of Culex quinquefasciatu. Citrus sinensis peel was collected from Rijiyar lemo in Kano state and was later processed using standard procedure. The peel was extracted using maceration method. Mosquito larvae was collected from the gutter at female hostel Bayero University Kano and was reared at the laboratory using standard procedure. The adult mosquito was identified using a proper taxonomic guild. Bioassay for the larvae and adult were conducted using procedure. The result of the study indicated that Citrus sinensis peel extracted at 6%w/v concentration recorded the highest mortality of the larvae (44.44%) followed by 4%w/v which also recorded (29.63%) mortality. In conclusion Citrus sinensis peel extract at 6%w/v concentration was most effective in killing mosquito larvae and adult respectively. It is recommended that, encouraging public the benefit of Citrus sinensis peel extract will promote waste recycling and sustainability and as well increasing public awareness and implementation on natural mosquito control methods to reduce mosquito population.

Abdulwaris Abdulrasheed, Human Anatomy - Bayero University, Kano, 2025

Lead (Pb) is a pervasive environmental pollutant known to induce nephrotoxicity through oxidative stress and inflammation. This study investigated the protective effects of Terminalia catappa bark extract on lead-induced kidney damage in Wistar rats. Twelve rats were divided into four groups: control (distilled water), lead-exposed (90 mg/kg lead acetate), lead + T. catappa (500 mg/kg extract), and T. catappa only. After 21 days, kidney tissues were analyzed histologically. The lead-exposed group exhibited severe tubular necrosis, glomerular atrophy, and interstitial inflammation, while the T. catappa-treated group showed significant preservation of renal architecture, with reduced necrosis and inflammation. These findings suggest that T. catappa bark extract mitigates lead-induced nephrotoxicity, likely due to its antioxidant and anti-inflammatory properties. This study supports the potential of T. catappa as a natural therapeutic agent against heavy metal-induced kidney damage, warranting further mechanistic and clinical research.