Contribution of N.N. Shevlyuk to the Development of Domestic Histology (On the 75th Anniversary of His Birth)

December 2025 marks the 75th anniversary of the famous Russian histologist, teacher, Doctor of Biological Sciences, Professor of the Department of Histology, Cytology and Embryology at Orenburg State Medical University, Honored Worker of the Higher School of the Russian Federation Nikolai Nikolaevich Shevlyuk. He was born on December 10, 1950 in the village of Linovitsk in the Martuk district of the Aktobe region of Kazakhstan in a family of employees of the Shevchenko MTS. N.N. Shevlyuk graduated from the Orenburg Pedagogical Institute (Faculty of Natural Geography, Department of Biology and Chemistry) in 1972. In 1972-1975 — he is a postgraduate student at the Department of Histology at the Orenburg Medical Institute. Since 1975 he has been working at the same department (since 1975 — assistant, since 1990 — associate professor, since 1998 — professor of the department). At the same time, in 1998-2006, he was a senior and then a leading researcher at the Laboratory of Functional Cell Morphology at the Institute of Cellular and Intracellular Symbiosis of the Ural Branch of the Russian Academy of Sciences. In 2000-2017, he worked concurrently as a professor at the Department of Zoology and Ecology of Orenburg State Pedagogical University. The degree of Candidate of Biological Sciences was awarded in 1978, Doctor of Biological Sciences — in 1998. The academic title of associate professor was awarded to N. N. Shevlyuk in 1991, professor — in 2000. His scientific research is devoted to the priority areas of modern biology and medicine – comparative and evolutionary histology, cell biology, history of natural sciences, and issues of teaching methods of histology. He is the author of more than 600 scientific and educational works, including 19 monographs. He described for the first time the ultrastructure of the Leydig cells of the testes of a number of vertebrates and identified the main directions of adaptive rearrangements of testicular endocrinocytes under the influence of various stressful influences. As a result of many years of intensive research on the problems of reproduction under the guidance of N.N. A new ecological and morphological scientific field has been founded and is successfully developing at the Department of Histology of the Orenburg Medical University, the object of which is the organs of the reproductive system of vertebrates living in anthropogenically transformed and natural ecosystems of the steppe zone of the Southern Urals.