Authors:E. Nagy, I. Timár, Z. Hegyi, T. Spitkó, and L. Marton
The chemical composition of maize makes it suitable for a wide range of nonconventional uses, including utilisation as a new source of energy for the 21st century as a raw material for biofuel. The aim of the experiments was to amalgamate the application of genetic markers with conventional breeding methods to produce maize hybrids whose starch content and ecostability satisfied the demands of industrial use, while having yield potential and agronomic traits on a par with those of hybrids currently cultivated. The chemical quality of 220 lines was evaluated using the NIR spectrometric technique, and the five maize inbred lines with the lowest and highest starch contents were selected for genetic marker studies. The variety identification of the lines was carried out using the isoenzymes stipulated by UPOV. The following SSR (simple sequences repeat) markers were tested: phi 095, umc 1057, nc 004, phi 096, nc 007, umc 1564, phi 85, y1 SSR, umc 1178, nc 009, phi 070, umc 1066, umc 1741, umc 1069, phi 033, phi 061, wx, phi 032, phi 084 and phi 062. The analysis of the fragment patterns revealed three SSR markers that appeared to be correlated with the starch content of the maize lines. These were the primer pairs
y1 SSR, umc 1069
. These results are only of a preliminary nature, however, as the incorporation of starch is probably regulated by several genes, and the studies suggest it is also influenced by several environmental factors. It also appears likely that the bioethanol yield is determined not only by the starch content, but also by other parameters. Further research should thus be expanded to include investigations into the structural and fermentability traits of starch molecules, including the characterisation of these traits using genetic markers.
Authors:Z. Á. Nagy, J. J. Bakonyi, Virág Som, and T. Érsek
A total of 123 isolates of
Phytophthora infestans were recovered from 43 commercial fields and allotments
of potato and tomato in Hungary. Isolates were characterised for mating type,
response to metalaxyl, isozyme genotype at glucose-6-phosphate isomerase (Gpi)
and peptidase A (Pep) loci, nuclear DNA fingerprint with probe RG57 and
mitochondrial haplotype. Both mating types were detected in 8 potato and 3
tomato fields. The frequency of A1 and A2 were 47.5% and 52.5% on potato and
60.5% and 39.5% on tomato. More than sixty per cent of the whole population
were resistant (31.1%) or responded intermediately (30.2%) to the fungicide
metalaxyl in vitro. All isolates were monomorphic at the Gpi locus (100/100),
but four allele combinations 100/100 (33%), 96/100 (28%), 96/96 (31%) and 83/96
(8%) were found at the Pep locus. Genotype Pep 83/96 is rare in Europe and all
isolates with this allele combination were of A1 mating type and Ia
mitochondrial haplotype. As in other European populations, only two of the four
mitochondrial haplotypes (Ia, 32.5% and IIa, 67.5%) were detected. Diversity of
RG57 fingerprints was high. Of the 79 different fingerprints found 67 were not
Authors:P. Nagy, G. Bakonyi, E. Péli, I. Sonnemann, and Z. Tuba
Long-term effects of the elevated atmospheric CO
on biosphere have been in focus of research since the last few decades. In this experiment undisturbed soil monoliths of loess grassland were exposed to an elevated CO
environment (two-times the ambient CO
level) for a period of six years with the aid of the open top chamber method. Control without a chamber and CO
elevation was applied as well. Elevated CO
level had very little impact on soil food web. It did not influence either root and microbial biomass or microbial and nematode community structure. The only significant response was that density of the bacterial feeder genus
increased in the chamber with elevated CO
concentration. Application of the open top chambers initiated more changes on nematodes than the elevated CO
level. Open top chamber (OTC) method decreased nematode density (total and plant feeder as well) to less than half of the original level. Negative effect was found on the genus level in the case of fungal feeder
, plant feeder
. It is very likely that the significantly lower belowground root biomass and partly its decreased quality reflected by the increased C/N ratio are the main responsible factors for the lower density of the plant feeder nematodes in the plots of chambers. According to diversity profiles, MI and MI(2–5) parameters, nematode communities in the open top chambers (both on ambient and elevated CO
level) seem to be more structured than those under normal circumstances six years after start of the experiment.
Authors:Edina Wappler, A. Gál, J. Skopál, and Z. Nagy
Although much is known about the protective effect of acute estrogen therapy in cerebral ischemia, relatively little is known about the importance of apoptosis and cerebral plasticity in this mechanism. In this work 10 min global cerebral ischemia was produced by transient bilateral carotid occlusion in 4-month-old ovariectomized female gerbils. In every of our experimental group (sham for ischemia group, ischemia group and ischemia + a high, single dose 17β-estradiol pre-treatment group) apoptotic (bcl-Xl, bax) and cerebral plasticity (GAP-43, synapsin-I, nestin) hippocampal genes’ expression was measured four days after surgery. Expression of the anti-apoptotic bcl-Xl (p<0.01) and the cerebral plasticity marker synapsin-I and nestin (p<0.01) increased with acute estrogen pretreatment in ischemic animals. No change, however, in bax or GAP-43 expression was detected in estrogen treated animals compared to ischemic gerbils. These results suggest that acute estrogen therapy has anti-apoptotic effect and increases cerebral plasticity, which play an important role in cytoprotection or cerebroprotection.
Authors:Á. Nagy, Z. Kovács, D. Szöllösi, and A. Fekete
The potentiometric electronic tongue is a new and rapidly developing technique. However, the description of the exact working mechanism is still absent. An important part of this description is the effect of the sample temperature on the measurement results. The paper reported here gives a description of the effect of temperature on results obtained with an α-Astree potentiometric electronic tongue. The yielded model was used to perform a temperature correction as if the samples were measured at room temperature (25 °c).
Authors:G. Kemény, K. Penksza, Nagy Z., and et al.
A neighbourding -quadrate transect study was conducted in order to examine the possibile relationship between small scale topography and coenotaxa occurrence and cover in subassociations of Festucetum vaginataeRapaics ex Soó 1929 sandy grassland plant community near Fülöpháza. These investigations served as a starting point in later soil seed bank studies. Cover of species was recorded in three transects of different exposition starting on the top of different dunes and ending in the depressions. Subassociations and facies forming species of the community occurred in all investigated transects. Parts of the transects could not have been classified unambiguously into any of the coenotaxa mentioned in the literature. In these zones the charactersitic species of the different subbasociations and facies were occurding together. These patches are propbably also the ones where changes in dominance relations and simultaneous spread of a species can relatively easily happen, as it is the case with Cleistogenes serotina. Annual vegetation of the open sandy grassland, ond the other hand, has occured only in the transition zones, between the subassociations or facies. In these transects moss-lichen synusia were peresent usually in the subassociation Festucetum vaginatae pennatae Kerner 1863.
Authors:Krisztina Nagy, S. Tóth, Z. Pálfia, and G. Réz
Growth regulation is a crucial event in tumour progression. Surprisingly, relatively few papers have dealt with the catabolic side of regulation, and there are practically no data regarding the autophagic process during tumour development. We approach this problem by morphometrical investigation into the possi- ble changes of autophagic activity during the progression of rat pancreatic adenocarcinoma induced by azaserine. In the present study, autophagic capacity of the azaserine-induced premalignant and malignant cells were characterised and compared to the respective host tissue cells of the rat pancreas and to the acinar cells in other stages of tumour development. Using vinblastine (VBL) as an enhancer, and cyclo- heximide (CHI) as an inhibitor of autophagic segregation we observed that autophagic capacity of pre- malignant cells (month 6 and 10 after initiation) is much higher than in the host tissue cells. We found a sharp decrease in self-digesting capacity in adenocarcinoma cells (month 20) where VBL induced a min- imal accumulation of autophagic vacuoles which was, surprisingly, not inhibited by CHI, i.e. the CHI- sensitive regulatory step was lost. The changes in autophagic capacity are probably associated to specif- ic steps of tumour progression in our system.
Authors:Sz. Szanyi, I. Szarukán, A. Nagy, J. Jósvai, Z. Imrei, Z. Varga, and M. Tóth
The performance of a semisynthetic bisexual lure (SBL, containing isoamyl alcohol, acetic acid and red wine) previously found attractive for a number of noctuids was compared with that of the respective synthetic sex attractants of Orthosia cerasi (=stabilis), O. cruda, O. gothica, O. incerta, Anorthoa munda and Conistra vaccini. The respective sex attractants performed significantly better in the Orthosia spp. than the SBL lure, which, although regularly catching low numbers of both females and males, did not differ significantly from zero catch in unbaited control traps. On the other hand, the SBL lure performed as well as the sex attractant in C. vaccini. Sizeable catches of C. rubiginea, C. rubiginosa and C. erythrocephala were also recorded in traps with the SBL lure. The SBL lure can prove to be a useful tool in ecological and faunistical studies of Conistra and related hibernating Xylenini species.
Authors:A. Gyenes, G.L. Sándor, B. Csákány, Zs. Récsán, G. Rudas, Z.Z. Nagy, and E. Maka
A case of a 13-year-old girl after being injured on the left eyeball by a stick from a cage, is presented. Along vitreous haemorrhage, retinal oedema and ischaemia, the disc was replaced by a cavity. Multimodal imaging was performed, which confirmed the optic nerve damage. The eye had no light perception anymore. Our case is a demonstration for complete avulsion of the optic nerve after blunt injury.
Authors:G. Tóth, N. Szentmáry, G.L. Sándor, B. Csákány, Z. Antus, M.T. Pluzsik, O. Lukáts, and Z.Z. Nagy
Our aims were to evaluate the primary and clinical evisceration indications and to analyse orbital implant related complications.
We included in our retrospective review all eviscerations between 2006 and 2016 at the Department of Ophthalmology of Semmelweis University, Budapest, Hungary. Primary evisceration indications were classified into six groups: trauma, surgical diseases, infections or inflammations, systemic diseases, tumours and unclassifiable diseases. Clinical immediate evisceration indications were also classified into six groups: painful blind eye due to glaucoma, atrophia/phthisis bulbi, endophthalmitis, cosmetic reasons, acute trauma and expulsive bleeding.
Evisceration was performed in 46 eyes of 46 patients (54.3% males, age 43.0 ± 18.6 years). The most common primary evisceration indications were trauma (37%), surgical diseases (34.8%), infection or inflammation (10.9%), systemic diseases (6.5%), tumours (8.7%) and unclassifiable diseases (2.2%). Painful blind eye due to glaucoma (34.8%) was the most common clinical indication for evisceration, followed by atrophia/phthisis bulbi (26.1%), endophthalmitis (17.4%), cosmetic reasons (13.0%), acute trauma (6.5%) and expulsive bleeding (2.2%). After evisceration, 91.3% of the patients received orbital implant and during 26.8±28.9 months follow-up implant related complications were found in 14.3% of the cases, including implant extrusion (4.8%), partial wound dehiscence (4.8%), implant exposure (2.4%) and orbital inflammation (2.4%).
Painful blind eye and atrophia/phthisis bulbi due to ocular trauma and surgical diseases represent the most common indications for ocular evisceration. If malignant intraocular tumours can be excluded, evisceration surgery combined with a silicon-based orbital implant is a safe and effective procedure.