Search Results
You are looking at 1 - 5 of 5 items for
- Author or Editor: Gábor Szőcs x
- Refine by Access: All Content x
Dr. Barnabás Nagy
(1921–2020), a naturalist, orthopterologist, agrozoologist and forward-looking ecologist covered a rich scientific career. In commemoration of his significant contribution to entomology, we attempt to shed some light on a selection of his achievements. While devoted to his chosen insect order, Orthoptera, he was sensitive also to problems coming from everyday’s practice in controlling pests in agriculture. Consequently, he dealt with various pest species, belonging to a variety of insect taxa (Coleoptera, Lepidoptera, Hymenoptera). He always put the actual problem in ecological context. This may have helped him to recognize the need for an ecological approach in plant protection and to develop the pioneering concept of biological / ecological pest management, published in Hungarian, as early as in 1957. When arguing for his concept, he criticized the surplus usages of toxic pesticides and provided guidelines for facilitating the beneficial activity of the natural enemies of pests. This way he prepared the way for integrated pest management (IPM), preceding the international mainstream of his age. He held an active part in the International Organization for Biological Control (IOBC), as a founder of the International Working Group of Ostrinia (IWGO), and was the Head of the Department of Zoology of the Plant Protection Institute, Budapest, Hungary. He held several positions in the Hungarian Entomological Society (President, vice-President, Secretary, committee member), to that society he was engaged for 80 years. Here we cite only some of his most important, original entomological papers. He regularly published also in journals for popular science and gave lectures for the young generations of entomologists.
Curriculum vitae in a nutshell
Abstract
Varroa mite, Varroa destructor is the most important ectoparasite of the honey bee, Apis mellifera worldwide, contributing to colony collapse. The development of alternative non-toxic methods against this pest is needed, as most of the wide-used acaricides in apiculture are banned in the European Union, which increase the risk of developing resistant mite populations against the remaining few products. In order to reveal biological basis of a new, semiochemical-based method, the aim of this study was to search for olfactory stimuli, used by female Varroa mites in orienting to drone brood for egglaying. Volatiles of uncapped drone brood were collected in situ, inside bee-hives, using either charcoal, or HayeSep® Q filters. Collections were analyzed by gas chromatograph linked to an electrotarsogram detector (GC-ETD), using the foreleg of female mite. Results showed that most components were present in collections trapped by any of these filters. However, some components appreared only in charcoal-, while others only in HayeSep® collections, respectively. Out of the large number of components, a few elicited electrophysiological responses. Structure elucidation of these active components are underways. Futher behavioral studies should reveal, which components play role in attraction of Varroa mites.
A szerzők előző közleményükben karbon/karbon állcsontimplantátumokkal kapcsolatos hosszú távú tapasztalataikról számoltak be. A jó funkcionális és esztétikai eredmények értékelése után a szervezet hatását vizsgálták az implantátum struktúrájára és morfológiájára nézve modern felületanalitikai módszerekkel. Nyolc év után eltávolított és be nem ültetett (referencia-) implantátumokat hasonlítottak össze. Mind a referencia-, mind a szervezetből eltávolított implantátum két fő komponense a szén és az oxigén, azonban a szervezet hatására az oxigén mennyisége három-négyszeresére nőtt, és nyomelemmennyiségben foszfort, ként, kalciumot és vasat mutattak ki. Az implantátumokat alkotó szénszálak vastagsága (5–7 μm) a szervezet hatására nem változott meg. A szervezetből eltávolított implantátum felületét – a referenciaimplantátum felületén nem található – 15–17 μm vastag réteg fedte, amelynek összetétele megegyezett a szénszálak összetételével. (A csontszövetre jellemző nagy mennyiségű kalciumot nem detektáltak.) Mindezek alapján megállapítható, hogy a karbon/karbon implantátumokat a szervezet agresszív hatása jelentős mértékben nem változtatja meg sem funkcionálisan, sem szerkezetileg. Orv. Hetil., 2012, 153, 744–750.
