Angel Kanchev University of Ruse

Effect of Ethanol Extract of Propolis on Paper Packaging Material

Propolis is a natural, accessible, and valuable bee product belonging to the group of so-called bioproducts. Its composition varies significantly depending on a number of factors, resulting in a wide range of data. The aim of this work is to investigate the antimicrobial effect o...

Existence Results for Singular Nabla Fractional Perturbed Problems

The aim of the present work is to study a class of singular perturbed nabla fractional problems coupled with Dirichlet conditions. Under sufficient conditions we show that the related Green’s function that can be expressed as an infinite series, is positive, which improves signif...

Study of Yield Components and Assessment of Their Stability in Local Field Pea Varieties Grown in Northeastern and Central Southern Bulgaria

Field pea (Pisum sativum L.) is an important legume crop whose productivity is strongly influenced by environmental conditions, making the evaluation of genotype performance and stability essential for breeding and sustainable cultivation. The aim of the present study was to eval...