Zh. Dimitrov Department of Animal husbandry – non-ruminant animals and special branches, Faculty of Agriculture, Trakia university, Student’s campus, 6000, Stara Zagora, Bulgaria (Manuscript received 22 October 2025; accepted for publication 30 January 2026) *e-mail: zivkod@abv.bg Abs

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S. Georgieva*, M. Stancheva Department of Chemistry, Medical University, Marin Drinov 55, 9002 Varna, Bulgaria (Manuscript received 25 April 2016; accepted for publication 30 May 2016) Abstract. Polychlorinated biphenyls (PCBs) are characterized by high lipophilicity and persistence i

The Tabanids (Diptera: Tabanidae) from the Belassitsa Mountain, Bulgaria D. Ganeva