Studying ascalaphid materials from
Thailand, Laos and Pakistan the authors determined specimens which belonged to
the genus of Nousera. In this paper the
redescription of the genus of Nousera and its type species, Nousera gibba Navás, 1923 can be found. Besides Nousera herczigi, a new
species from Pakistan is also described. With altogether 23 figures. In the end
the species of Nousera were revised and found that Nousera furcifer (Van der
Weele, 1909) does not belong to the genus of Nousera. As its original generic
name of Pseudoptynx Van der Weele, 1909 is a homonym, a new name (nomen novum)
has to be given replaced such as Ascapseudoptynx furcifer (Van der Weele,
Using laboratory experiments, the
daily activity patterns of 16 Neuroptera species (6 Chrysopidae, 2
Coniopterygidae, 3 Hemerobiidae, 3 Myrmeleontidae, 1 Mantispidae, 1
Ascalaphidae) were studied by the authors. The results of the experiments were
described by activity diagrams and were categorized into Duelli-type flight
activity pattern. During the study, 14 species showed carnea type of nocturnal
activity. Mantispa styriaca proved to belong to hypochrysodes type which is
active at daytime. The daily activity pattern of Libelloides macaronius differs
from the hypochrysodes type due to its strong preference of UV radiation;
therefore it is described as a separate libelloides type.
The present study gives a description of two new genus belonging to Ascalaphini tribus according to the classification of Ascalaphinae Lefébvre, 1842 [=Schizophthalminae Weele (1908)]: the Horischema gen. n. and Perissoschema gen. n. It also describes some of their species, Horischema ronkayorum sp. n. and Perissoschema evae sp. n. from the area of the Himalayas, Pakistan, and Nepal. Key for all genera of the tribus is given. With 8 photos.
In this study the Ptyngidricerus Van der Weele, 1908 genus has been revised and in the course of this 2 new genera and 4 new species are described. The description of the new genus was made possible apart from the male samples, the females (P. albardanus) which were recorded and supplement of the description based on damaged specimens (P. iranensis) earlier enabling the evaluation of their taxonomic status. The following species belonging to Ptyngidricerus genus: Ptyngidricerus albardanus albardanus (McLachlan, 1891), Ptyngidricerus albardanus pterostigmatus Alexandrov Martynov, 1926, Ptyngidricerus pseudoalbardanus sp. n. Ptyngidricerus persepolisensis sp. n. and Ptyngidricerus sendanensis sp. n. from Iran and Ptyngidricerus pakistanensis sp. n. from Pakistan. Apart from describing the new species the authors present a description of the female Ptyngidricerus albardanus albardanus (McLachlan, 1891) which has so far not been known according to the literature on this species. The earlier described species were combinated on the basis of their genitalia and external morphological characteristics in new genus: Iranoidricerus iranensis (Kimmins, 1938) and Omanoidricerus venustus (Tjeder and Waterston, 1977). The illustration of the female and male genitalia of Iranoidricerus iranensis Kimmins, 1938 is also presented. On account of sexual dimorphism a key is given for identification of the female and male specimens with 25 figures.
Shell eggs have been irradiated with increasing radiation doses in the 0.5-3.0 kGy dose range and various non-microbiological changes, important from the point of view of consumer quality, have been estimated. Dose-dependent changes in the flow behaviour of egg white and brittleness of the yolk membrane in broken eggs, sensorial parameters of the raw and soft-boiled eggs, whippability and foam stability of the egg white were observed. Considering that a minimal dose of 1.5 kGy would be required for radiation inactivation of salmonellae and other, non-pathogenic bacteria, the quality of irradiated eggs upon such gamma radiation dose would not be equal in all parameters to those of the fresh shell eggs, however, changes in sensorial and functional properties at this dose level may be still acceptable, mainly for risk population and some industrial use.
Authors:L.A. Castillo A., L. Mészáros, and F. Kiss
The microbiological spoilage of foods depends on the initial microbiological contamination and some factors which influence the growth of microorganisms. Therefore, reducing the initial cell count is necessary for both extending shelf-life and improving food safety. Physical, chemical and combined treatments serve this purpose. In these experiments, the effect of trisodium phosphate dipping (0-15% solutions) was studied. Chicken wings were used, which after dipping (1 min) in the solution were packed in PE-PA-PE pouches and stored at 4 °C. Aerobic mesophilic (Nutrient Agar, Merck), pseudomonad (Pseudomonas Selective Agar, Oxoid), and Enterobacteriaceae counts (VRBD Agar, Merck) were determined by Spiral Plate Technique at 30 °C incubation temperature. Effect of 3.8, 5.7, 7.6% trisodium phosphate dipping solutions was studied as a function of storage time. Immediately after treatment, total colony count was reduced by maximum 1.5 log cycles. Pseudomonads were the most sensitive. One day after treatment with these low concentration solutions, the colony count was reduced by 2 log cycles. Na3PO4concentration higherthan 7.6% practically did not result in higher effectivity. The growth rate and maximum cell count of surviving fraction were estimated as a function of trisodium phosphate concentration. It can be concluded from fitted survival curves that immediately after treatment the initial viable cell count was reduced and the critical spoilage level (107g-1) has been reached 2-3 days later than in case of the untreated samples, i.e. the shelf-life was extended.
Authors:L.A. Castillo A., L. Mészáros, and I.F. Kiss
The effect of high hydrostatic pressure (HHP) and nisin was studied on micro-organisms in minced chicken and beef meat. Pressure in the range of 0-800 MPa and nisin (670 IU g-1) were applied for vacuum packed minced meat. In chicken meat the total viable cell count decreased by 3 log cycles as an effect of HHP at 300 MPa and by 5 log cycles in combination with nisin. The D value is 35-39 MPa for pseudomonads in minced chicken meat. In case of inoculation with L. monocytogenes, the cell count in beef meat was reduced only by pressure higher than 200 MPa (“shoulder”) with a characteristic value of D=37-38 MPa. B. cereus spores, both dormant and heat activated, were very resistant (D=800 MPa) in beef. However, the survival of pressurised spores after chilled storage (for two weeks at 4 °C) was smaller for non-heat activated spores than for heat activated spores. Efficiency of HHP combined with nisin needs further research work.
Authors:J. Farkas, Éva Andrássy, L. Mészáros, and Anna Simon
Suspensions of a bioluminescent (luxAB) transformant of Listeria monocytogenes in pH 7.0 phosphate buffer were pressurised and the effect of the pressure treatment was monitored by plate counting. When the bacteria were suspended in NaCl- and nisin-free buffer the number of colony forming units (CFU) decreased by 3 and 6 log cycles after 300 MPA for 10 and 30 min, respectively. Supplementing the plating medium with 5% NaCl did not influence the colony forming capacity of non-pressurised cells, however, CFU of residual populations after respective treatments of 300 MPa for 10 and 30 min were reduced by a further 2 and 3.5 log cycles in case of salt containing plates. Nisin-addition to the plating medium caused less than one log unit decrease in the CFU of the non-pressurised population. However, the CFU of 10 min-pressurised sample was 4 log cycles less in the nisin-containing plates than in the nisin-free ones, whereas no colonies were formed in the nisin-containing plates even when 1 ml was inoculated from the originally 1010 CFU/ml population after 300 MPa for 30 min. The luciferase activities (bioluminescence intensities) decreased concomitant with the reduction of the viable cell counts, however, they were approx. 0.6-0.8 log units less in the presence of 5% NaCl in the pressurised suspension than those expected from the previously established linear correlation between the logarithmic light outputs and the logarithmic viable cell counts.
Authors:I. Karsai, K. Mészáros, L. Láng, and Z. Bedő
Tillering ability is a complex trait, the development of which is influenced by both environmental factors and complex genetic regulation. In the present experiments this complex regulation was dissected into its various components in an effort to separate the effect on tillering of major genes influencing ontogeny from that of other genomic factors. The tillering rate of a facultative × winter barley mapping population was examined in the field after autumn and spring sowing. The vernalisation sensitivity gene
exerted a considerable influence on tillering in spring-sown barley. In addition to the major genes, QTL analysis revealed two chromosome regions (1HS and 3HL) with a significant influence on the extent of tillering. Neither of these regions were involved in the regulation of heading date, and their effect on tillering was the most intense at the beginning of ontogeny, gradually declining as the influence of the
gene increased. The function of the
locus in the regulation of tillering is manifested partly through a direct effect on the transition from the vegetative to the generative phase and partly indirectly via epistatic regulation of other chromosome regions influencing tillering.