In the article we presented the results of HBA toxicity on honey bees tests in different concentrations and whether they have any influence on the grooming behavior of worker bees. For the purpose of the study toxicological tests were made on caged bees. HBA of different concentrations were tested per os and topically, application of 0.5 µl of each di-rectly on the thorax of a bee. The allogrooming danc¬es were video-documented before, in-between, and after the insertion of cellulose carrier containing HBA, and mite fall during the experiments was count¬ed in parallel. Our results suggest that the mechanism of HBA action may not be through the haemolimph ingested by a mite but may be either contact-toxic to Varroa or may stimulate bees into performing allogrooming which is one of the successful mechanisms of Varroa mite resistance in bee colonies.
COBISS.SI-ID: 5582952
In this study, we focused on the content of beta-acids in various hop genotypes from the SIHRB breeding program, with the aim to identify potentially interesting cultivars for producing beta-acids which are recently showing potential use for varroa suppression on bees. We selected 31 hop genotypes during the technological maturity and determined alpha- and beta-acids, as well as the content of essential oil. Among the genotypes we found five breeding lines where beta-acids content was over 6%. The alpha-acids content of these genotypes did not reach high values and therefore the alpha/beta ratio was relatively low.
COBISS.SI-ID: 760204
In this paper, we present hop natural compounds and an overview of methods for their isolation, chemical analysis and for the determination of their antioxidant, antimicrobial and antigenotoxic potentials. This paper provides an overview of extraction and fractionation techniques of the most important hop compounds, which are known for their health-promoting properties. Although hops are still the main ingredient to ensure the taste, stability and antimicrobial protection of beer, they have also found use in the pharmaceutical and other food industries. This review focuses on a number of health effects of hops, ranging from antioxidant, sedative and anti-inflammatory potentials, through anticancer properties to estrogenic and repellent action.
COBISS.SI-ID: 22103062