Search Results

You are looking at 1 - 10 of 69 items for

  • Author or Editor: T. Nagy x
  • Refine by Access: All Content x
Clear All Modify Search

Abstract  

This paper analyses the publication process of journal papers using a comparative methodology based on two indicators: the publishing delay of the manuscripts and the nationality of authors publishing in the journals under study. Using these indicators Hungarian foreign language journals are compared with some national journals of other countries

Restricted access

Ultrastructural characteristics of muscle fibers and neuromuscular contacts were investigated during two stages of embryogenesis of the pulmonate snail Lymnaea stagnalis. The first muscle cells appear as early as during metamorphosis (50–55% of embryonic development), whereas previously, in the trochophore/veliger stages (25–45%), muscular elements cannot be detected at all. The first muscle fibers contain large amounts of free numbers, a well-developed rER system and only a few irregularly arranged contractile elements. The nucleus is densely packed with heterochromatine material. At 75% adult-like postmetamorphic stage, the frequency of muscle fibers increases significantly, but, bundles of muscle fibers cannot yet be observed. Furthermore the muscle cells are characterized by large numbers of free ribosomes and numerous rER elements. Fine axon bundles and single axon processes, both accompanied by glial elements, can already be found at this time. Axon varicosities with different vesicle and/or granule contents form membrane contacts with muscle fibers, but without revealing membrane specialization on the pre- or postsynaptic side. The late development of the muscle system and neuromuscular contacts during Lymnaea embryogenesis correlates well with the maturation of different forms of behavior of adult, free-living life, and also with the peripheral appearance of chemically identified components of the embryonic nervous system of central origin.

Restricted access

Chronic kidney diseases (CKDs) are the most common forms of kidney disease all around the world. The incidence of CKD is rising, which is mainly driven by population aging as well as by a global rise in hypertension, metabolic syndrome, and metabolic risk factors, particularly obesity and type-2 diabetes. The high mortality, morbidity of CKD, and the health care costs of the renal replacement therapy have led investigators to seek recent and potentially modifiable risk factors such as non-alcoholic fatty liver disease (NAFLD). NAFLD is the hepatic manifestation of metabolic syndrome and the most common cause of chronic liver disease. It incorporates a spectrum of liver diseases ranging from simple steatosis to steatohepatitis, liver cirrhosis, and hepatocellular carcinoma. On the basis of recent publications, the prevalence of CKD is significantly increased among patients with NAFLD, and the prevalence of NAFLD is also higher in CKD patients than in patients without NAFLD. These findings suggest that patients with NAFLD should be screened for CKD and patients with CKD and metabolic syndrome should be screened for NAFLD. Patients with NAFLD and CKD should be treated and followed up by a multidisciplinary team that involves specialists in hepatology, nephrology, diabetes, and cardiology.

Open access

OIE Terrestrial Animal Health Code. 13th and 14th editions (2004 and 2005) from the World Organization for Animal Health, Paris, France. 14th edition, 2005. ISBN 92-9044-635-8. Ref.: A 135; Jacques Euzéby, Gilles Bourdoiseau, Claude-Marie Chauve: Dictionnaire de parasitologie médicale et vétérinaire (Dictionary of Medical and Veterinary Parasitology). Éditions Tec & Doc - EM Inter - Lavoisier. Cachan, France, 2005. 492 pages. ISBN 2-7430-0705-2;

Restricted access

In this study we (1) examined the applicability of the widely available CORINE land cover map of Europe in predicting several components of the richness of forest breeding bird community, and (2) analysed how different ecologically meaningful species groups respond to the differences in landscape composition and how these differences are reflected in the relationships between total species richness and richness of these species groups at the 2.5 × 2.5 km2 scale. We found that landscape composition had only moderate success in predicting the richness components of the forest bird community. The predictive power of the applied general linear models differed very much: roughly 60% of the observed variance was explained when the dependent variables (species richness and abundance) were calculated using data of all the 21 studied forest bird species or that of common forest birds. However, species richness and abundance of groups of more vulnerable species were predicted with much less success (30% variance explained), suggesting that CORINE is not an adequate tool in predicting the conservation status of these sensitive forest birds. Forest cover explicated 90 to 100% of the explained variance in the models suggesting that forest bird community was much less sensitive to the type of land cover occuring in the surroundings. We showed that richness and abundance of selected species groups had different non-linear relationships with total species richness, suggesting that — if used alone —, total species richness is a weak predictor of other richness components of the forest bird community.

Restricted access

Summary  

The geodesic graph of Riemannian spaces all geodesics of which are orbits of 1-parameter isometry groups was constructed by J. Szenthe in 1976 and it became a basic tool for studying such spaces, called g.o.\ spaces. This infinitesimal structure corresponds to the reductive complement \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{upgreek} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \pagestyle{empty} \DeclareMathSizes{10}{9}{7}{6} \begin{document} $\mathfrak m$ \end{document} in the case of naturally reductive spaces. The systematic study of Riemannian g.o. spaces was started by O. Kowalski and L.~Vanhecke in 1991, when they introduced the most important definitions, classified the low-dimensional examples and described the basic constructions of this theory. The aim of this paper is to investigate a connection theoretical analogue of the concept of the geodesic graph.

Restricted access

Although porcine adenoviruses (PAdV) are present in the swine populations worldwide, they usually do not cause any disease, or the infection is only manifested in a mild diarrhoea or respiratory signs. The importance of adenoviruses, however, is constantly growing as there is a possibility of developing them into viral vector vaccines against more significant swine pathogens. A short summary of the well-established facts of porcine adenoviruses is given and recent developments of the genetic analysis of these viruses are discussed in detail. The possibilities of vector development and examples of vector vaccines already reported in the literature are mentioned.

Restricted access

Thermal properties of ammonium nitrate

I. Study of the reproducibility of DTA curves in relation to modification transformation

Journal of Thermal Analysis and Calorimetry
Authors:
E. Jóna
,
T. Šramko
, and
D. Nagy
Restricted access

Phytophthora alni is a species hybrid that causes a destructive root and collar rot disease of alders throughout Europe. Its subspecies, P. alni subsp. alni (Paa), P. alni subsp. uniformis (Pau) and P. alni subsp. multiformis (Pam) can be distinguished on the basis of phenotypic and genotypic traits. In this study, we report evidence of an unusual genomic combination of two subspecies occurring in two P. alni isolates from Hungary. These isolates, which had previously been identified as Paa using hybrid-specific PCR primers and morphological traits, exhibited a mitochondrial DNA restriction pattern identical to that of Pau. However, RAPD patterns and isozyme profiles of nuclear genes encoding glucose-phosphate isomerase (Gpi) and malate dehydrogenase (Mdh) of the two atypical isolates were identical to those found in all Paa isolates. Isozyme analysis also revealed a novel allele at the putative Mdh-1 locus in Paa and Pam isolates. The atypical Paa isolates have likely emerged as a result of hybridization events in the P. alni population between Paa and Pau .

Restricted access