Khalid Siddiq

Serum Ferritin Concentration in Haematologic, Infectious and Metabolic Disorders: A Critical Appraisal of Interpretive Thresholds, Mechanistic Assumptions and Clinical Utility

Ashraf Soliman, Mohamed Yassin, Ahmed Khalil, Mohamed Alkalaf, Khalid Siddiq & Mohamed Qusad · Asian Journal of Research in Biochemistry · 2026

Serum ferritin is among the most frequently requested laboratory investigations in general medicine, yet its interpretation rests on assumptions that the accumulated evidence supports only in part. The analyte is used simultaneously as a surrogate for body iron stores, as an acut...

Open access Research Article 10.9734/ajrb/2026/v16i5513

CYP11A1-derived Non-canonical Secosteroids and Circadian–Endocrine Regulation: A Scoping Review

Ashraf Soliman, Fawzia Alyafei, Nada Alaaraj, Noor Hamed, Ahmed Elawwa, Shayma Mohamed, Noora Alhumaidy, Khalid Siddiq & Mohamed Elkalaf · Asian Journal of Pediatric Research · 2026

Background: Vitamin D is traditionally characterized as a nutrient essential for calcium homeostasis. However, emerging evidence suggests that the cutaneous CYP11A1-driven secosteroid pathway serves as a "chemical proxy" for sunlight, linking environmental UV radiation to the syn...

Open access Research Article 10.9734/ajpr/2026/v16i2522